KR20240041190A - Electronic device for determining a output voltage of dc-dc converter and method of operating the same - Google Patents

Abstract

A first electronic device that transmits power wirelessly according to an embodiment may include a DC-DC converter, an inverter, a power transmission circuit including a coil, and a processor. The processor according to one embodiment may be configured to establish a communication connection with a second electronic device that wirelessly receives power. The processor according to one embodiment may be set to determine that the DC-DC converter outputs a reference voltage. The processor according to one embodiment sets the switching frequency of the inverter to the first frequency and sets the duty ratio of the inverter to the first duty ratio, and the second electronic device reduces the load of the second electronic device. It may be set to transmit a first message requesting to set the first load value through the communication connection. The processor according to one embodiment is based on transmitting the first power based on the reference voltage while setting the switching frequency to the first frequency and the duty ratio to the first duty ratio, The device may be set to receive a first packet containing information about power received in a first state in which the load is set to the first load value from the second electronic device. The processor according to an embodiment sets the second electronic device to check the first voltage at which the rectified voltage of the second electronic device is controlled to a specified voltage value in the first state, based on the first packet. It can be. Here, the first voltage may be a voltage output from the DC-DC converter and applied to the inverter. The processor according to one embodiment sets the switching frequency of the inverter to a second frequency and sets the duty ratio of the inverter to a second duty ratio, and the second electronic device converts the load to a second load. It may be set to transmit a second message requesting to set a value through the communication connection. The processor according to one embodiment is based on transmitting the second power based on the reference voltage while the switching frequency is set to the second frequency, and the second electronic device sets the maximum load value. It can be set to receive a second packet containing information about the power received in the second state from the second electronic device. Based on the second packet, the processor according to an embodiment allows the second electronic device to check a second voltage at which the rectified voltage of the second electronic device is controlled to a specified voltage value in the second state. can be set. Here, the second voltage may be a voltage output from the DC-DC converter and applied to the inverter. The processor according to an embodiment may determine the output voltage of the DC-DC converter to be applied to the inverter based on the first voltage and the second voltage. The processor according to one embodiment, based on the output voltage. It may be set to wirelessly transmit power to the second electronic device through the power transmission circuit.

Description

Electronic device for wirelessly transmitting power that determines the output voltage of a DC-DC converter and its operating method {ELECTRONIC DEVICE FOR DETERMINING A OUTPUT VOLTAGE OF DC-DC CONVERTER AND METHOD OF OPERATING THE SAME}

The present invention relates to an electronic device for wirelessly transmitting power that determines the output voltage of a DC-DC converter and a method of operating the same.

Wireless charging technology uses wireless power transmission and reception. For example, it is a system that can automatically charge the battery by simply placing the electronic device on a charging pad without connecting it with a separate charging connector.

Wireless charging technology includes an electromagnetic induction method, a resonance method using resonance, or an RF/Micro Wave Radiation method that converts electrical energy into microwaves and transmits them.

The power transmission method by wireless charging is a method of transmitting power between the first coil of the transmitting end and the second coil of the receiving end. A magnetic field is generated at the transmitting end, and current is induced or resonates according to changes in the magnetic field at the receiving end, creating energy.

The wireless power transmission device generates an electromagnetic field by applying a current to the transmission coil, and the generated electromagnetic field generates electromotive force by induction or resonance in the reception coil of the wireless power reception device, so that power can be transmitted wirelessly.

A first electronic device that transmits power wirelessly according to an embodiment may include a DC-DC converter, an inverter, a power transmission circuit including a coil, and a processor. The processor according to one embodiment may be configured to establish a communication connection with a second electronic device that wirelessly receives power. The processor according to one embodiment may be set to determine that the DC-DC converter outputs a reference voltage. The processor according to one embodiment sets the switching frequency of the inverter to the first frequency and sets the duty ratio of the inverter to the first duty ratio, and the second electronic device reduces the load of the second electronic device. It may be set to transmit a first message requesting to set the first load value through the communication connection. The processor according to one embodiment is based on transmitting the first power based on the reference voltage while setting the switching frequency to the first frequency and the duty ratio to the first duty ratio, The device may be set to receive a first packet containing information about power received in a first state in which the load is set to the first load value from the second electronic device. The processor according to an embodiment sets the second electronic device to check the first voltage at which the rectified voltage of the second electronic device is controlled to a specified voltage value in the first state, based on the first packet. It can be. Here, the first voltage may be a voltage output from the DC-DC converter and applied to the inverter. The processor according to one embodiment sets the switching frequency of the inverter to a second frequency and sets the duty ratio of the inverter to a second duty ratio, and the second electronic device converts the load to a second load. A second message requesting to set a value may be transmitted through the communication connection. The processor according to an embodiment is based on transmitting second power based on the reference voltage while the switching frequency is set to the second frequency, and the second electronic device sets the maximum load value. It can be set to receive a second packet containing information about the power received in the second state from the second electronic device. Based on the second packet, the processor according to an embodiment causes the second electronic device to check a second voltage at which the rectified voltage of the second electronic device is controlled to a specified voltage value in the second state. can be set. Here, the second voltage may be a voltage output from the DC-DC converter and applied to the inverter. The processor according to an embodiment may determine the output voltage of the DC-DC converter to be applied to the inverter based on the first voltage and the second voltage. The processor according to one embodiment, based on the output voltage. It may be set to wirelessly transmit power to the second electronic device through the power transmission circuit.

A method of operating a first electronic device that wirelessly transmits power according to an embodiment may include establishing a communication connection with a second electronic device that wirelessly receives power. A method of operating the first electronic device according to an embodiment includes setting the switching frequency of the inverter included in the first electronic device to the first frequency and setting the duty ratio of the inverter to the first duty ratio, The method may include transmitting, by a second electronic device, a first message requesting to set the load of the second electronic device to a first load value through the communication connection. The operating method of the first electronic device according to an embodiment is based on transmitting first power based on the reference voltage while setting the switching frequency to the first frequency and the duty ratio to the first duty ratio. Thus, the method may include receiving a first packet containing information about the power received in a first state in which the second electronic device sets the load to the first load value from the second electronic device. . A method of operating the first electronic device according to an embodiment includes, based on the first packet, the second electronic device controlling the rectified voltage of the second electronic device to a specified voltage value in the first state. 1May include an operation to check voltage. Here, the first voltage may be a voltage output from the DC-DC converter of the first electronic device and applied to the inverter. A method of operating the first electronic device according to an embodiment includes setting the switching frequency of the inverter to a second frequency and setting the duty ratio of the inverter to a second duty ratio, and the second electronic device It may include transmitting a second message requesting to set the load to a second load value higher than the first load value through the communication connection. The operating method of the first electronic device according to an embodiment is based on transmitting second power based on the reference voltage while setting the switching frequency to the second frequency and the duty ratio to the second duty ratio. Thus, the method may include receiving a second packet containing information about the power received in a second state in which the second electronic device sets the load to the second load value from the second electronic device. . A method of operating the first electronic device according to an embodiment includes, based on the second packet, the second electronic device controlling the rectified voltage of the second electronic device to a specified voltage value in the second state. It may include an operation of checking the second voltage. Here, the second voltage may be a voltage output from the DC-DC converter and applied to the inverter. A method of operating the first electronic device according to an embodiment includes determining the output voltage of the DC-DC converter included in the first electronic device to be applied to the inverter based on the first voltage and the second voltage. Can include actions. A method of operating the first electronic device according to an embodiment may include wirelessly transmitting power to the second electronic device based on the output voltage.

In a non-transitory recording medium according to an embodiment, an operation of establishing a communication connection with a second electronic device that wirelessly receives power by a first electronic device that transmits power wirelessly, the first electronic device comprising: In a state where the switching frequency of the inverter included in the first electronic device is set to the first frequency and the duty ratio of the inverter is set to the first duty ratio, the first electronic device, the second electronic device, and the second electronic device An operation of transmitting a first message requesting to set a load to a first load value through the communication connection, wherein the first electronic device sets the switching frequency to a first frequency and sets the duty ratio to the first load value. Based on transmitting the first power based on the reference voltage in a state set to the duty ratio, the second electronic device includes information about the power received in the first state in which the load is set to the first load value. An operation of receiving a first packet from the second electronic device, wherein the first electronic device, based on the first packet, determines that the rectified voltage of the second electronic device in the first state is An operation of checking a first voltage controlled to a specified voltage value, where the first voltage is a voltage output from a DC-DC converter of the first electronic device and applied to the inverter, and the first electronic device is the inverter. With the switching frequency set to the second frequency and the duty ratio of the inverter set to the second duty ratio, the second electronic device sets the load to a second load value higher than the first load value. An operation of transmitting a requesting second message through the communication connection, wherein the first electronic device sets the switching frequency to a second frequency and the duty ratio to a second duty ratio, and transmits a second message based on the reference voltage. Based on transmitting second power, a second packet containing information about the power received in a second state in which the second electronic device sets the load to the second load value is received from the second electronic device. An operation in which the first electronic device determines, based on the second packet, a second voltage at which the rectified voltage of the second electronic device is controlled to a specified voltage value in the second state. operation, where the second voltage is a voltage output from the DC-DC converter and applied to the inverter, and the first electronic device applies the inverter to the inverter based on the first voltage and the second voltage. An operation of determining an output voltage of a DC-DC converter included in a first electronic device, and an operation of the first electronic device wirelessly transmitting power to the second electronic device based on the output voltage. Instructions can be saved.

1 is a block diagram of a first electronic device that wirelessly transmits power and a second electronic device that wirelessly receives power, according to an embodiment.
Figure 2 is a block diagram of a first electronic device and a second electronic device according to an embodiment.
FIG. 3A is a flow chart explaining a method by which a first electronic device determines the output voltage of a DC-DC converter according to an embodiment.
FIG. 3B is a flow chart to explain a method in which a first electronic device determines the output voltage of a DC-DC converter based on the first voltage and the second voltage, according to an embodiment.
FIGS. 4A and 4B are diagrams showing the output voltage of the inverter included in the first electronic device according to the duty ratio of the inverter, according to an embodiment.
FIGS. 5A and 5B are diagrams illustrating an operation of a second electronic device setting a load to a maximum load value or a minimum load value, according to an embodiment.
FIG. 6 is a data flow for explaining the operation of a first electronic device and a second electronic device according to an embodiment.
FIG. 7 is a flow chart illustrating a method for a first electronic device to check the first voltage based on a packet received from a second electronic device, according to an embodiment.
FIGS. 8A and 8B are diagrams illustrating a method for a first electronic device to check a first voltage and a second voltage, according to an embodiment.
9 is a block diagram of an electronic device in a network environment, according to various embodiments.

1 is a block diagram of a first electronic device that wirelessly transmits power and a second electronic device that wirelessly receives power, according to an embodiment.

Referring to FIG. 1, the first electronic device 101 according to one embodiment may wirelessly transmit power 106 to the second electronic device 103. Alternatively, the first electronic device 101 may receive information 107 from the second electronic device 103. In one example, the first electronic device 101 may transmit (or transmit) power 106 according to an induction method. When the first electronic device 101 transmits power by induction, the first electronic device 101 may include, for example, a power source, a direct current-to-direct current conversion circuit (e.g., a DC/DC converter), It may include at least one of a DC-AC conversion circuit (eg, an inverter), an amplification circuit, an impedance matching circuit, at least one capacitor, at least one coil, or a communication modulation circuit. At least one capacitor may form a resonance circuit together with at least one coil. The first electronic device 101 may be implemented in a manner defined in the wireless power consortium (WPC) standard (or Qi standard). The first electronic device 101 may include a coil that can generate an induced magnetic field when a current flows according to an induction method. The process of the first electronic device 101 generating an induced magnetic field can be expressed as the first electronic device 101 wirelessly transmitting power 106. In addition, in the coil of the second electronic device 103, induced electromotive force (or current, voltage, and/or power) may be generated by a magnetic field generated around the coil according to a resonance method or an induction method. The process of generating induced electromotive force through the coil can be expressed as the second electronic device 103 receiving power 106 wirelessly.

The first electronic device 101 according to one embodiment may perform communication with the second electronic device 103. For example, the first electronic device 101 may communicate with the second electronic device 103 according to an in-band method. The first electronic device 101 may modulate data to be transmitted according to, for example, frequency shift keying (FSK) modulation, and the second electronic device 103 may perform amplitude shift keying (ASK) modulation. ) Information 107 can be provided by performing modulation according to the modulation method. The first electronic device 101 can check the information 107 provided by the second electronic device 103 based on the amplitude of the current and/or voltage applied to the transmission coil. In Figure 1, the second electronic device 103 is shown as transmitting information 107 directly to the first electronic device 101, but this is only for ease of understanding, and the second electronic device 103 Those skilled in the art will understand that only controls the on/off of at least one internal switch. The operation of performing modulation based on the ASK modulation method and/or FSK modulation method can be understood as an operation of transmitting data (or packets) according to the in-band communication method, and can be understood as the operation of transmitting data (or packets) according to the ASK demodulation method and/or FSK demodulation method. The operation of performing demodulation based on a method can be understood as an operation of receiving data (or packets) according to an in-band communication method.

In this document, the first electronic device 101 or the second electronic device 103 performing a specific operation refers to various hardware included in the first electronic device 101 or the second electronic device 103, for example. For example, a controller such as a micro controlling unit (MCU), field programmable gate array (FPGA), application specific integrated circuit (ASIC), microprocessor, or application processor (AP) performs a specific operation. It can mean. Alternatively, the first electronic device 101 or the second electronic device 103 performing a specific operation may mean that the controller controls other hardware to perform the specific operation. Alternatively, when the first electronic device 101 or the second electronic device 103 performs a specific operation, the data is stored in a storage circuit (e.g., memory) of the first electronic device 101 or the second electronic device 103. As at least one instruction to perform a specific operation is executed, it may mean causing a controller or other hardware to perform a specific operation.

Meanwhile, in this document, for convenience of explanation, the description focuses on an embodiment in which the first electronic device 101 wirelessly transmits power 106 to the second electronic device 103. However, the technical idea of the present invention may not be limited thereto. For example, the second electronic device 103 may wirelessly transmit power to the first electronic device 101. Additionally, the first electronic device 101 can wirelessly receive power from the second electronic device 103.

Figure 2 is a block diagram of a first electronic device and a second electronic device according to an embodiment.

Referring to FIG. 2, according to one embodiment, the first electronic device 101 includes a power source 211, a DC-DC converter 215, and a plurality of switches (Q1, Q2, Q3, and Q4). It may include an inverter 218, a capacitor 214, a first coil 213, and a processor 220.

According to one embodiment, power provided by power source 211 may be provided to DC/DC converter 215. The power source 211 is an interface for connection to an external travel adapter (TA), a battery (not shown), a charger (not shown), or a power management integrated circuit (PMIC) of the first electronic device 101. It may include at least one of (not shown). The power source 211 may provide, for example, direct current power to the DC-DC converter 215, but there is no limitation on the form of power provided. The DC-DC converter 215 can convert the voltage of the received power and provide it to the inverter 218. The DC-DC converter 215 may change the voltage of the input DC power and provide DC power with the changed voltage (or output voltage (VOUT)) to the inverter 218. The DC-DC converter 215 may perform, for example, buck conversion and/or boost conversion, and may be implemented as, for example, a 3-level converter, but those skilled in the art will understand that there is no limit to its type. The voltage output from the DC-DC converter 215 may be stored in the capacitor 216 before being applied to the inverter 218.

According to one embodiment, the processor 220 may determine the output voltage (VOUT) or the magnitude of the output voltage (VOUT) of the DC-DC converter 215. The processor 220 may output a control signal to the DC-DC converter 215 so that the DC-DC converter 215 generates a determined output voltage. The DC-DC converter 215 may convert the voltage of power provided from the power source 211 (eg, buck converting or boost converting) under the control of the processor 220.

The inverter 218 according to one embodiment may output AC power using the output voltage (VOUT) provided from the DC-DC converter 215. The inverter 219 may further include a regulator 219. The regulator 219 converts (e.g., buck converting and/or boost converting) and/or regulates the power output from the DC-DC converter 215, and converts the converted or regulated power into a plurality of devices. It can be applied to the switches (Q1, Q2, Q3, Q4). For example, the regulator 219 may be implemented as a low dropout (LDO). A plurality of switches (Q1, Q2, Q3, Q4) may form a full bridge circuit, for example, but there is no limit to the number of switches or the type of bridge circuit. For example, when a full bridge circuit is configured, one end of the first coil 213 may be connected to the connection point between the switches Q1 and Q2 through the capacitor 212, and the first coil 213 The other end of may be connected to a connection point between the switches Q3 and Q4. The plurality of switches (Q1, Q2, Q3, Q4) may be controlled to be in an on or off state. For example, in order to generate alternating current power, the processor 220 controls the first switch (Q1) and the third switch (Q3) to be turned on during the first period while turning on the second switch (Q2) and the fourth switch ( Q4) can be controlled in the off state, and during the second period, the first switch (Q1) and the third switch (Q3) are controlled in the off state, while the second switch (Q2) and the fourth switch (Q4) are in the on state. It can be controlled, and the above-described control operations can be performed repeatedly. The processor 215 may provide a control signal for controlling the on/off states of the switches Q1, Q2, Q3, and Q4 to the switches Q1, Q2, Q3, and Q4. Here, not only outputting the control signal but also refraining from outputting the control signal can be referred to as control of the processor 220.

The processor 220 according to one embodiment may determine a switching frequency for switching the on/off states of the plurality of switches Q1, Q2, Q3, and Q4. For example, the switching frequency may refer to a frequency that alternately changes switches in the on state among the plurality of switches Q1, Q2, Q3, and Q4. The processor 220 may generate alternating current power having a specific frequency through the switching frequencies of the plurality of switches Q1, Q2, Q3, and Q4. For example, when the processor 220 controls the inverter 218 to generate alternating current power having a first frequency, the processor 220 operates the switches Q1 and Q3 during a period corresponding to the first frequency. This means outputting a control signal to control the on state, then outputting a control signal to control the switches Q2 and Q4 to the on state for a period corresponding to the first frequency, and repeating the above-described output operations. can do.

Meanwhile, the processor 220 controls the inverter 218 to generate alternating current power having a second frequency in a state in which the processor 220 turns on the switches Q1 and Q3 for a period corresponding to the second frequency. This may mean outputting a control signal for controlling the switch to the on state, then outputting a control signal for controlling the switches Q2 and Q4 in the on state for a period corresponding to the second frequency, and repeating the above-described output operations. In this case, the period corresponding to the second frequency may be different from the period corresponding to the first frequency.

According to one embodiment, alternating current power generated by the inverter 218 may be applied to the first coil 213. The capacitor 214 may form the first coil 213 and the resonance circuit 212. The first coil 213 may form a magnetic field based on applied alternating current power. A portion of the magnetic field (or magnetic flux) formed by the first coil 213 may pass through the cross section of the second coil 223 of the second electronic device 103. As the magnetic field passing through the cross section of the second coil 223 changes over time, induced electromotive force (eg, current, voltage, or power) may be generated in the second coil 223.

According to one embodiment, the processor 220 may check information provided by the second electronic device 103 through the first coil 213. The processor 220 may, for example, perform analog-to-digital converting (ADC) on the signal received through the first coil 213. The processor 220 can decode the digital value obtained as a result of the ADC and confirm the information provided by the second electronic device 103 according to the decoding result. For example, the first electronic device 101 may receive an ASK modulation signal. The electronic device 101 may detect changes in voltage and/or current occurring in the transmission circuit 212 or the inverter 218 by the ASK modulation signal and decode the corresponding signal. Those skilled in the art will understand that the decoding method may be, for example, based on the Qi standard, but is not limited.

According to one embodiment, the processor 220 may determine the output voltage (VOUT) or the magnitude of the output voltage (VOUT) of the DC-DC converter 215 in the initialization step. For example, the processor 220 determines the output voltage VOUT or the output voltage VOUT based on a packet (e.g., control error packet (CEP)) received from the second electronic device 103. You can decide the size. Thereafter, the processor 220 may apply the determined output voltage (VOUT) to the inverter 218 and wirelessly transmit power to the second electronic device 103. For example, the initialization step may refer to a step before transmitting power to the second electronic device 103 in earnest.

Existing electronic devices that transmit power wirelessly output a predetermined voltage from a DC-DC converter depending on the type of electronic device that receives power wirelessly. For example, since the size of the coil mounted on each electronic device that wirelessly receives power is different, the electronic device that transmits power wirelessly may have different output from the DC-DC converter depending on the type of electronic device that wirelessly receives power. The voltage values had to be set differently. Additionally, because the DC-DC converter of an electronic device that transmits power wirelessly is set to output a predetermined voltage depending on the type of electronic device that wirelessly receives power, it is possible to receive power wirelessly while transmitting power wirelessly. If the rectified voltage of the electronic device transmitting power falls outside the control range, the electronic device transmitting power wirelessly must reset the output voltage of the DC-DC converter.

The first electronic device 101 according to an embodiment checks whether the rectified voltage VRECT of the second electronic device 103 is controlled to a specified voltage value in the initialization step and then adjusts the output voltage of the DC-DC converter 215. You can set it. That is, the first electronic device 101 has an output voltage of a suitable DC-DC converter 215 such that the rectified voltage VRECT of the second electronic device 103 can be controlled to a specified voltage value before starting wireless charging. can be decided. Through this, the DC-DC converter 215 of the first electronic device 101 may not output a predetermined voltage depending on the type of the second electronic device 103. Additionally, the first electronic device 101 may not reset the size of the output voltage (VOUT) of the DC-DC converter 215 while transmitting power wirelessly.

According to one embodiment, the second electronic device 103 includes a second coil 223, a capacitor 224, a rectifier circuit 250 including a plurality of switches (S1, S2, S3, and S4), and a controller ( (not shown), a regulator 255, and a battery 260.

According to one embodiment, a controller (not shown) may control the overall operation of the second electronic device (eg, an operation of wirelessly receiving power).

According to one embodiment, the second coil 223 and the capacitor 224 may be included in the resonance circuit 222. One end of the capacitor 224 may be connected to the second coil 223, and the other end of the capacitor 224 may be connected to one end of the rectifier circuit 250.

According to one embodiment, the rectifier circuit 250 may include a plurality of switches S1, S2, S3, and S4 that can operate as a full bridge circuit. One end of the resonance circuit 222 may be connected to a connection point between the switches S1 and S2, and the other end of the resonance circuit 222 may be connected to a connection point between the switches S3 and S4. For example, one end of the first switch (S1) and one end of the fourth switch (S4) are connected to the regulator 255, and one end of the second switch (S2) and one end of the third switch (S3) are connected to the regulator 255. It may be connected to the other end of the first switch (S1) and the other end of the fourth switch (S4), respectively. The other end of the second switch (S2) and the other end of the third switch (S3) may be connected to ground. The other end of the first switch (S1) and one end of the second switch (S2) may be connected to one end of the receiving coil 221, and one end of the third switch (S3) and the other end of the fourth switch (S4) may be connected to the first switch (S2). It can be connected to the other end of coil 2 (223). The rectifier circuit 250 may convert alternating current power received through the second coil 223 into direct current power. A controller (not shown) may control the on/off states of the plurality of switches S1, S2, S3, and S4 so that AC power can be converted into DC power. A controller (not shown) may rectify the power signal received from the second coil 223 through the rectifier circuit 250 and supply it to the regulator 255. For example, the regulator 255 may be supplied with a rectified current (IRECT) having a rectified voltage (VRECT).

Meanwhile, the number and types of switches shown in FIG. 2 are merely illustrative, and embodiments of the present invention may not be limited thereto.

According to one embodiment, the regulator 255 may perform conversion (eg, buck conversion and/or boost conversion) and/or regulation of the voltage of the rectified power output from the rectifier circuit 250. Power converted and/or regulated by the regulator 255 may be stored in the battery 260.

According to one embodiment, the second electronic device 103 may further include a charging circuit (or charger) (not shown). A charging circuit (or charger) (not shown) may charge the battery 260 using power converted and/or regulated by the regulator 255. According to one embodiment, a charging circuit (not shown) charges the battery 260 according to the charging mode (e.g., constant current (CC) mode, constant voltage (CV) mode, or fast charging mode) of the battery 260. The voltage and/or current for charging can be controlled. Depending on the implementation, the PMIC may be connected to the regulator 255 in place of a charging circuit (not shown).

At least some of the operations of the first electronic device 101 described below may be performed by the processor 220. Additionally, at least some of the operations of the second electronic device 103 may be performed by the controller of the second electronic device 103. However, for convenience of explanation, it will be described that the first electronic device 101 and the second electronic device 103 perform the corresponding operations.

FIG. 3A is a flow chart explaining a method by which a first electronic device determines the output voltage of a DC-DC converter according to an embodiment.

Referring to FIG. 3A, according to one embodiment, in operation 301, the first electronic device 101 may identify the second electronic device 103 that will wirelessly receive power. Additionally, the first electronic device 101 can establish a communication connection for wireless charging with the second electronic device 103.

According to one embodiment, the first electronic device 101 may perform an initialization operation to perform wireless charging. For example, in the initialization step, the first electronic device 101 sets the output voltage (VOUT) of the DC-DC converter 215 so that the second electronic device 103 can control the rectified voltage (VRECT) to a specified voltage. You can set it.

According to one embodiment, in operation 303, the first electronic device 101 may set the DC-DC converter 215 to output a reference voltage. For example, the reference voltage may mean a reference voltage for determining the output voltage (VOUT) of the DC-DC converter 215. The first electronic device 101 can determine the output voltage (VOUT) of the DC-DC converter 215 by adjusting the reference voltage. For example, the reference voltage may be 5V.

According to one embodiment, in operation 305, the first electronic device 101 may set the switching frequency of the inverter 218 to the first frequency. The first electronic device 101 may set the duty ratio of the inverter 218 to the first duty ratio. Additionally, the first electronic device 101 may transmit a first message requesting the second electronic device 103 to set the load to the minimum load value through the established communication connection. For example, the first message may include a command requesting the second electronic device 103 to set the load to the minimum load value (or minimum load condition). For example, the first frequency may be the maximum value (or maximum frequency) of the frequency for switching on/off the plurality of switches Q1, Q2, Q3, and Q4 included in the inductor 218. For example, the first duty ratio may be the minimum value (or minimum duty ratio) of the duty ratio of the inductor 218. According to the provisions of the WPC standard, when the switching frequency is the maximum frequency, the gain of the second electronic device 103 may be the lowest. For example, according to the provisions of the WPC standard, when the switching frequency is the maximum frequency, it can be furthest from the resonance point. However, depending on implementation, the technical idea of the present invention may not comply with WPC regulations. For example, when the switching frequency is the maximum frequency, the gain of the second electronic device 103 may not be the lowest.

According to one embodiment, the second electronic device 103 may set the load of the second electronic device 103 to the first load value (e.g., minimum load value or minimum load condition) based on the first message. there is. For example, a state in which the second electronic device 103 sets the load to the first load value (or minimum load value) may be defined as the first state of the second electronic device 103.

According to one embodiment, in operation 307, the first electronic device 101 sets the switching frequency of the inverter 218 to the first frequency and sets the duty ratio of the inverter 218 to the first duty ratio, The first power based on the reference voltage may be transmitted to the second electronic device 103. Additionally, the first electronic device 101 may receive a first packet based on transmission of first power from the second electronic device 103. For example, the first power is generated when the first electronic device 101 sets the reference voltage to the inverter ( This may be power applied to 218) and transmitted to the second electronic device 103. For example, the first packet is transmitted to the second electronic device 103 by the necessary power (or rectified voltage (VRECT) of a specified voltage value) and the first power that the second electronic device 103 requests to be transmitted in the first state. It may include information about the first difference between the received power (or the rectified voltage (VRECT) by the first power). The first packet may be implemented as a control error packet (CEP) specified in the WPC standard. Alternatively, the first packet may include information about the power received by the second electronic device 103 from the first electronic device 101 in the first state, information requesting that the second electronic device 103 change transmission power, Alternatively, it may include information about the required power requested by the second electronic device 103. For example, when the first packet does not include information about the first difference, the first electronic device 101 may determine or confirm the first difference based on the information included in the first packet.

According to one embodiment, in operation 309, the first electronic device 101 sets the rectified voltage (VRECT) of the second electronic device 103 in the first state based on the first packet. The first voltage controlled by this specified voltage value can be confirmed. For example, when the switching frequency of the inverter 218 is the maximum value (maximum value specified by the first electronic device 101), the first voltage is the voltage value specified by the rectified voltage VRECT of the second electronic device 103. It may be the maximum voltage that can be controlled. At this time, the first voltage may be a voltage output from the DC-DC converter 215 and applied to the inverter 218.

According to one embodiment, in operation 311, the first electronic device 101 may set the switching frequency of the inverter 218 to the second frequency. The first electronic device 101 may set the duty ratio of the inverter 218 to the second duty ratio. Additionally, the first electronic device 101 may transmit a second message requesting the second electronic device 103 to set the load to the maximum load value through the established communication connection. For example, the second message may include a command requesting the second electronic device 103 to set the load to the maximum load value. For example, the second frequency may be the minimum value (or minimum frequency) of the frequency for switching on/off the plurality of switches Q1, Q2, Q3, and Q4 included in the inductor 218. For example, the second duty ratio may be the maximum value (or maximum duty ratio) of the duty ratio of the inductor 218. According to the provisions of the WPC standard, when the switching frequency is the minimum frequency, the gain of the second electronic device 103 may be highest. For example, according to the provisions of the WPC standard, when the switching frequency is the minimum frequency, it may be closest to the resonance point. However, depending on implementation, the technical idea of the present invention may not comply with WPC regulations. For example, when the switching frequency is the minimum frequency, the gain of the second electronic device 103 may not be the highest.

According to one embodiment, the second electronic device 103 may set the load of the second electronic device 103 to a second load value (e.g., maximum load value or maximum load condition) based on the second message. there is. For example, a state in which the second electronic device 103 sets the load to the second load value (or maximum load value) may be defined as the second state of the second electronic device 103.

According to one embodiment, in operation 313, the first electronic device 101 sets the switching frequency of the inverter 218 to the second frequency and sets the duty ratio of the inverter 218 to the second duty ratio, The second power based on the reference voltage may be transmitted to the second electronic device 103. Additionally, the first electronic device 101 may receive a second packet based on the transmission of second power from the second electronic device 103. For example, the second power is generated when the first electronic device 101 sets the reference voltage to the inverter ( This may be power applied to 218) and transmitted to the second electronic device 103. For example, the second packet is transmitted to the second electronic device 103 by the necessary power (or rectified voltage (VRECT) of a specified voltage value) and the second power that the second electronic device 103 requests to be transmitted in the second state. It may include information about the second difference between the received power (or the rectified voltage (VRECT) by the second power). The second packet may be implemented as a control error packet (CEP) specified in the WPC standard. Alternatively, the second packet may include information about the power received by the second electronic device 103 from the first electronic device 101 in the second state, information requesting that the second electronic device 103 change transmission power, Alternatively, it may include information about the required power requested by the second electronic device 103. For example, when the second packet does not include information about the second difference, the first electronic device 101 may determine or confirm the second difference based on the information included in the second packet.

According to one embodiment, in operation 315, the first electronic device 101 sets the rectified voltage VRECT of the second electronic device 103 in the second state based on the second packet. The second voltage controlled by this specified voltage value can be confirmed. For example, the second voltage is the voltage value at which the rectified voltage VRECT of the second electronic device 103 is specified when the switching frequency of the inverter 218 is the minimum value (e.g., the minimum value specified by the first electronic device 101). It may be the minimum voltage that can be controlled. At this time, the second voltage may be a voltage output from the DC-DC converter 215 and applied to the inverter 218.

According to one embodiment, in operation 317, the first electronic device 101 calculates the output voltage (VOUT) of the DC-DC converter 215 applied to the inverter 218 based on the first voltage and the second voltage ( or the size of the output voltage) can be determined.

According to one embodiment, in operation 319, the first electronic device 101 based on the determined output voltage VOUT. Power can be transmitted wirelessly to the second electronic device 103. For example, the first electronic device 101 may convert the power supplied from the power source 211 through the DC-DC converter 215 to generate the output voltage VOUT. The first electronic device 101 can wirelessly transmit power to the second electronic device 103 by applying the output voltage (VOUT) to the inverter 218. For example, the step of wirelessly transmitting power by the first electronic device 101 based on the determined output voltage (VOUT) may be a step after the initialization step (eg, a wireless charging step).

According to one embodiment, the first electronic device 101 may check the output voltage of the DC-DC converter 215 according to a designated period. For example, when it is confirmed that the alignment of the second electronic device 103 is misaligned, the first electronic device 101 can re-determine the size or voltage value of the output voltage of the DC-DC converter 215. At this time, the first electronic device 101 can determine the voltage value of the output voltage of the DC-DC converter 215 according to the method described above.

FIG. 3B is a flow chart to explain a method in which a first electronic device determines the output voltage of a DC-DC converter based on the first voltage and the second voltage, according to an embodiment.

Referring to FIG. 3B, according to one embodiment, in operation 351, the first electronic device 101 may check the first voltage and the second voltage. For example, the first voltage may be greater than the second voltage.

According to one embodiment, in operation 353, the first electronic device 101 may set the DC-DC converter 215 to output a voltage value between the first voltage and the second voltage. For example, the first electronic device 101 may determine the average value of the first voltage and the second voltage as the output voltage (VOUT) of the DC-DC converter 215.

According to one embodiment, the first electronic device 101 may check only one of the first voltage and the second voltage. Additionally, the first electronic device 101 may determine the output voltage (VOUT) of the DC-DC converter 215 based on either the first voltage or the second voltage. For example, the first electronic device 101 may determine a voltage value lower than the first voltage by a specified amount as the output voltage (VOUT) of the DC-DC converter 215. At this time, the first electronic device 101 may omit the operations (operations 311 to 315) for checking the second voltage described in FIG. 3. Alternatively, the first electronic device 101 may determine a voltage value higher than the second voltage by a specified amount as the output voltage (VOUT) of the DC-DC converter 215. At this time, the first electronic device 101 may omit the operations (operations 305 to 309) for checking the first voltage described in FIG. 3.

FIGS. 4A and 4B are diagrams showing the output voltage of the inverter included in the first electronic device according to the duty ratio of the inverter, according to an embodiment.

Referring to FIGS. 4A and 4B , according to one embodiment, the first electronic device 101 may adjust the duty ratio of the inverter 218 (or the switches Q1, Q2, Q3, and Q4).

Referring to FIG. 4A, according to one embodiment, the first electronic device 101 may set the duty ratio of the inverter 218 (or the switches Q1, Q2, Q3, and Q4) to the maximum duty ratio. For example, the first electronic device 101 may turn off the second switch (Q2) and the third switch (Q3) while the first switch (Q1) and the fourth switch (Q4) are turned on. Additionally, the first electronic device 101 can turn on the second switch (Q2) and the third switch (Q3) while the first switch (Q1) and the fourth switch (Q4) are turned off. At this time, the first electronic device 201 can wirelessly transmit power to the second electronic device 202 by applying the voltage output through the inverter 218 to the first coil 213.

Referring to FIG. 4B, according to one embodiment, the first electronic device 101 may set the duty ratio of the inverter 218 (or the switches Q1, Q2, Q3, and Q4) to the minimum duty ratio. For example, the first electronic device 101 can control the on/off of the first switch (Q1), the second switch (Q2), the switch (Q3), and the fourth switch (Q4). At this time, the first electronic device 201 can wirelessly transmit power to the second electronic device 202 by applying the voltage output through the inverter 218 to the first coil 213.

Referring to FIGS. 4A and 4B , the output voltage of the inverter 218 at the maximum duty ratio may be different from the output voltage of the inverter 218 at the minimum duty ratio.

According to one embodiment, in order to check the first voltage, the first electronic device 101 sets the switching frequency of the inverter 218 to the maximum frequency and sets the duty ratio of the inverter 218 to the minimum duty ratio to can operate.

According to one embodiment, in order to check the second voltage, the first electronic device 101 sets the switching frequency of the inverter 218 to the minimum frequency and sets the duty ratio of the inverter 218 to the maximum duty ratio to can operate.

FIGS. 5A and 5B are diagrams illustrating an operation of a second electronic device setting a load to a maximum load value or a minimum load value, according to an embodiment.

Referring to FIG. 5A, according to one embodiment, the maximum load value and minimum load value may be different depending on the type of electronic device that wirelessly receives power. For example, the first device, the second device, and the third device may set different maximum load values and minimum load values. The first device, second device, and third device may be implemented as various types of electronic devices (e.g., smartphone, wearable watch, wireless earphone).

According to one embodiment, the first device may set the maximum load value so that the rectified voltage (VRECT) is 5.5V and the rectified current (IRECT) is 800mA. Additionally, the first device can set the minimum load value so that the rectified voltage (VRECT) is 5V and the rectified current (IRECT) is 210mA. When the second electronic device 103 is the first device, the first electronic device 101 can check the first voltage at which the second electronic device 103 can control the rectified voltage (VRECT) to 5.5V. there is. In addition, when the second electronic device 103 is the first device, the first electronic device 101 checks the second voltage at which the second electronic device 103 can control the rectified voltage VRECT to 5V. You can.

According to one embodiment, the second device may set the maximum load value so that the rectified voltage (VRECT) is 5V and the rectified current (IRECT) is 300mA. Additionally, the second device can set the minimum load value so that the rectified voltage (VRECT) is 5V and the rectified current (IRECT) is 25mA. When the second electronic device 103 is the second device, the first electronic device 101 can check the first voltage at which the second electronic device 103 can control the rectified voltage (VRECT) to 5V. . In addition, when the second electronic device 103 is the second device, the first electronic device 101 checks the second voltage at which the second electronic device 103 can control the rectified voltage VRECT to 5V. You can.

According to one embodiment, the third device may set the maximum load value so that the rectified voltage (VRECT) is 5V and the rectified current (IRECT) is 115mA. Additionally, the third device can set the minimum load value so that the rectified voltage (VRECT) is 5V and the rectified current (IRECT) is 33mA. When the second electronic device 103 is a third device, the first electronic device 101 can check the first voltage at which the second electronic device 103 can control the rectified voltage VRECT to 5V. . In addition, when the second electronic device 103 is a third device, the first electronic device 101 can check the second voltage at which the second electronic device 103 can control the rectified voltage VRECT to 5V. You can.

Referring to FIG. 5B, according to one embodiment, an electronic device that receives power wirelessly may have different maximum and minimum load values depending on the fast charging type. For example, the second electronic device 103 may set different maximum load values and minimum load values for the first type, second type, and third type. For example, the first type, the second type, and the third type may be fast charging types that provide different amounts of power (eg, 14.3W, 10.8W, 7.5W).

According to one embodiment, the second electronic device 103, in the first type, may set the maximum load value so that the rectified voltage (VRECT) is 11V and the rectified current (IRECT) is 1.3A. Additionally, the second electronic device 103, in the first type, can set the minimum load value so that the rectified voltage (VRECT) is 5V and the rectified current (IRECT) is 210mA. When the second electronic device 103 supports the first type of fast charging, the first electronic device 101 is a first electronic device that can control the rectified voltage VRECT to 11V. You can check the voltage. In addition, the first electronic device 101 is capable of controlling the rectified voltage VRECT to 5V when the second electronic device 103 supports the first type of fast charging. You can check the second voltage.

According to one embodiment, the second electronic device 103, in the second type, may set the maximum load value so that the rectified voltage (VRECT) is 9V and the rectified current (IRECT) is 1.2A. Additionally, in the second type, the second electronic device 103 may set the minimum load value so that the rectified voltage (VRECT) is 5V and the rectified current (IRECT) is 210mA. When the second electronic device 103 supports the second type of fast charging, the first electronic device 101 is a first electronic device 103 that can control the rectified voltage VRECT to 9V. You can check the voltage. In addition, the first electronic device 101 is capable of controlling the rectified voltage VRECT to 5V when the second electronic device 103 supports the second type of fast charging. You can check the second voltage.

According to one embodiment, the second electronic device 103, in the third type, may set the maximum load value so that the rectified voltage (VRECT) is 10V and the rectified current (IRECT) is 0.75A. Additionally, the second electronic device 103, in the third type, can set the minimum load value so that the rectified voltage (VRECT) is 5V and the rectified current (IRECT) is 210mA. When the second electronic device 103 supports the third type of fast charging, the first electronic device 101 is a first electronic device that can control the rectified voltage VRECT to 10V. You can check the voltage. In addition, the first electronic device 101 is capable of controlling the rectified voltage VRECT to 5V when the second electronic device 103 supports the third type of fast charging. You can check the second voltage.

Meanwhile, the values shown in FIGS. 5A and 5B are provided as examples for convenience of explanation, and embodiments of the present invention may not be limited thereto.

FIG. 6 is a data flow for explaining the operation of a first electronic device and a second electronic device according to an embodiment.

Referring to FIG. 6 , according to one embodiment, in operation 601, the first electronic device 101 may identify the second electronic device 103 requesting wireless power transmission. In operation 603, the first electronic device 101 may establish a communication connection with the second electronic device 103.

According to one embodiment, in operation 605, the first electronic device 101 may set the output parameters of the DC-DC converter 215 so that the DC-DC converter 215 outputs a reference voltage. Additionally, the first electronic device 101 may set the switching frequency of the inverter 218 to the first frequency and set the duty ratio of the inverter 218 to the first duty ratio. For example, the first frequency may be the maximum switching frequency specified for the first electronic device 101. The first duty ratio may be the minimum duty ratio of the inverter 218.

According to one embodiment, in operation 607, the first electronic device 101 may transmit a first message to the second electronic device 103.

According to one embodiment, in operation 609, the second electronic device 101 may set the load to the minimum load value based on the first message.

According to one embodiment, in operation 611, the first electronic device 101 sets the switching frequency of the inverter 218 to the first frequency and supplies first power based on the reference voltage to the second electronic device 103. ) can be transmitted.

According to one embodiment, in operation 613, the first electronic device 101 may receive a first packet from the second electronic device 103. For example, the first packet is transmitted to the second electronic device 103 by the necessary power (or rectified voltage (VRECT) of a specified voltage value) and the first power that the second electronic device 103 requests to be transmitted in the first state. It may include information about the first difference between the received power (or the rectified voltage (VRECT) by the second power). Alternatively, the first packet may include information about the power received by the second electronic device 103 from the first electronic device 101 in the first state, information requesting that the second electronic device 103 change transmission power, Alternatively, it may include information about the required power requested by the second electronic device 103.

According to one embodiment, in operation 615, the first electronic device 101 may check the first voltage based on the first packet. For example, the first electronic device 101 may check the first voltage based on information about the first difference included in the first packet. Alternatively, the first electronic device 101 may check the first difference based on information included in the first packet and check the first voltage based on the confirmed first difference. For example, the first electronic device 101 may determine the first voltage by adjusting the reference voltage so that the first difference becomes “0”.

According to one embodiment, in operation 617, the electromagnetic eliminator 101 may set the switching frequency of the inverter 218 to the second frequency and set the duty ratio of the inverter 218 to the second duty ratio. For example, the second frequency may be the minimum switching frequency specified for the first electronic device 101. The second duty ratio may be the maximum duty ratio of the inverter 218.

According to one embodiment, in operation 619, the first electronic device 101 may transmit a second message to the second electronic device 103.

According to one embodiment, in operation 621, the second electronic device 101 may set the load to the maximum load value based on the second message.

According to one embodiment, in operation 623, the first electronic device 101 sets the switching frequency of the inverter 218 to the second frequency and supplies the second power based on the reference voltage to the second electronic device 103. ) can be transmitted.

According to one embodiment, in operation 625, the first electronic device 101 may receive a second packet from the second electronic device 103. For example, the second packet is transmitted to the second electronic device 103 by the necessary power (or rectified voltage (VRECT) of a specified voltage value) and the second power that the second electronic device 103 requests to be transmitted in the second state. It may include information about the second difference between the received power (or the rectified voltage (VRECT) by the second power). Alternatively, the second packet may include information about the power received by the second electronic device 103 from the first electronic device 101 in the second state, information requesting that the second electronic device 103 change transmission power, Alternatively, it may include information about the required power requested by the second electronic device 103.

According to one embodiment, in operation 627, the first electronic device 101 may check the second voltage based on the second packet. The first electronic device 101 can check the first voltage based on information about the second difference included in the second packet. Alternatively, the first electronic device 101 may check the second difference based on information included in the second packet and check the second voltage based on the confirmed second difference. For example, the first electronic device 101 may determine the second voltage by adjusting the reference voltage so that the second difference becomes “0”.

According to one embodiment, in operation 629, the first electronic device 101 may determine the output voltage (VOUT) of the DC-DC converter 215 based on the first voltage and the second voltage. For example, the first electronic device 101 may determine a voltage value between the first voltage and the second voltage as the output voltage (VOUT).

According to one embodiment, in operation 631, the first electronic device 101 may wirelessly transmit power to the second electronic device 103 based on the determined output voltage (VOUT).

FIG. 7 is a flow chart illustrating a method for a first electronic device to check the first voltage based on a packet received from a second electronic device, according to an embodiment.

Referring to FIG. 7 , according to one embodiment, in operation 701, the first electronic device 101 may set or control the DC-DC converter 215 so that the DC-DC converter 215 outputs a reference voltage.

According to one embodiment, in operation 703, the first electronic device 101 sets the switching frequency of the inverter 218 to a specific frequency (e.g., a first frequency) and sets the duty ratio of the inverter 218 to a specific duty ratio. In a state (e.g., first duty ratio), the first power based on the reference voltage can be transmitted to the second electronic device 103.

According to one embodiment, in operation 705, the first electronic device 101 may receive a packet for the first power based on the reference voltage from the second electronic device 103. The packet includes the necessary power that the second electronic device 103 requests to transmit (or a predetermined voltage value for the rectified voltage VRECT) and the power received by the second electronic device 103 by the first power (or It may include information about the difference between the voltage value of the rectified voltage (VRECT) by the first power. For example, the packet may include information about the difference between the voltage value of the rectified voltage VRECT caused by transmission of the first current and a predetermined voltage value (eg, 5V). Alternatively, the packet may include information about the power received by the second electronic device 103 from the first electronic device 101, information requesting that the second electronic device 103 change transmission power, or the second electronic device ( 103) may include information about the required power requested.

According to one embodiment, in operation 707, the first electronic device 101 determines the required power (or rectified voltage VRECT) that the second electronic device 103 requests to transmit, based on the received packet. The difference between the voltage value) and the power received by the second electronic device 103 by the first power (or the voltage value of the rectified voltage (VRECT) by the first power) can be confirmed. For example, based on the packet, the first electronic device 101 determines the difference (e.g., corresponding to the difference) between the voltage value of the rectified voltage (VRECT) by transmission of the first current and a specified voltage value (e.g., 5V). voltage value) can be checked.

According to one embodiment, in operation 709, the first electronic device 101 may check whether the difference is “0”.

According to one embodiment, if it is determined that the difference is not “0” (No in operation 709), in operation 711, the first electronic device 101 selects the voltage output from the DC-DC converter 215 (e.g. The reference voltage) may be adjusted (e.g., increased or decreased), and the first power based on the adjusted voltage may be transmitted to the second electronic device 103. For example, the first electronic device 101 is based on the difference (e.g., a voltage value corresponding to the difference) between the voltage value of the rectified voltage (VRECT) by transmission of the first current and a specified voltage value (e.g., 5V). Thus, the magnitude of the voltage output from the DC-DC converter 215 can be adjusted.

According to one embodiment, in operation 713, the first electronic device 101 may receive a packet for the first power based on the adjusted voltage from the second electronic device 103. Based on the received packet, the first electronic device 101 determines the difference (e.g., corresponding to the difference) between the voltage value of the rectified voltage (VRECT) by transmission of the first current and the specified voltage value (e.g., 5V). voltage value) can be checked. If it is determined that the difference is not “0” (No in operation 709), the first electronic device 101 may readjust (e.g., increase or decrease) the voltage output from the DC-DC converter 215.

According to the above-described method, the first electronic device 101 can adjust the voltage output from the DC-DC converter 215 until the difference becomes “0”.

According to one embodiment, if the difference is determined to be “0” (example of operation 709), the first voltage may be confirmed or determined in operation 715. For example, the first electronic device 101 may determine the magnitude of the voltage at which the difference becomes “0” as the magnitude of the output voltage (VOUT) of the DC-DC converter 215.

According to the above-described method, the first electronic device 101 can check the second voltage. For example, the first electronic device 101 can check the second voltage in the same way as the method of checking the first voltage described above. However, since the operations for checking the second voltage overlap with the method for checking the first voltage, they will be omitted.

FIGS. 8A and 8B are diagrams illustrating a method for a first electronic device to check a first voltage and a second voltage, according to an embodiment.

Referring to FIG. 8A, the first electronic device according to one embodiment can check the first voltage.

According to one embodiment, the first electronic device 101 sets the switching frequency of the inverter 218 to the first frequency (e.g., maximum frequency) and sets the duty ratio of the inverter 218 to the first duty ratio. , the first power can be transmitted to the second electronic device 103. The first electronic device 101 receives a first packet for the first power from the second electronic device 103, and converts the output voltage (VOUT) of the DC-DC converter 215 based on the received first packet. The size of can be adjusted (e.g. increased). The first electronic device 101 may transmit the first power to the second electronic device 103 while increasing the magnitude of the output voltage (VOUT) of the DC-DC converter 215. The first electronic device 101 controls the output voltage (VOUT) of the DC-DC converter 215 until the size of the rectified voltage (VRECT) of the second electronic device 103 reaches a specified voltage value (e.g., 5V). ) can increase the size. The first electronic device 101 outputs the output voltage (VOUT) of the DC-DC converter 215 when the size of the rectified voltage (VRECT) of the second electronic device 103 becomes a specified voltage value (e.g., 5V). (or the magnitude of the output voltage) can be confirmed as the first voltage. For example, the first electronic device 101 may check the first voltage as 7.2V.

Referring to FIG. 8B, the first electronic device according to one embodiment can check the second voltage.

According to one embodiment, the first electronic device 101 sets the switching frequency of the inverter 218 to the second frequency (e.g., minimum frequency) and sets the duty ratio of the inverter 218 to the second duty ratio. , the second power can be transmitted to the second electronic device 103. The first electronic device 101 receives a second packet for the second power from the second electronic device 103, and converts the output voltage (VOUT) of the DC-DC converter 215 based on the received second packet. The size of can be adjusted (e.g. increased). The first electronic device 101 may transmit the second power to the second electronic device 103 while increasing the magnitude of the output voltage (VOUT) of the DC-DC converter 215. The first electronic device 101 controls the output voltage (VOUT) of the DC-DC converter 215 until the size of the rectified voltage (VRECT) of the second electronic device 103 reaches a specified voltage value (e.g., 5V). ) can increase the size. The first electronic device 101 outputs the output voltage (VOUT) of the DC-DC converter 215 when the size of the rectified voltage (VRECT) of the second electronic device 103 becomes a specified voltage value (e.g., 5V). (or the magnitude of the output voltage) can be confirmed with the second voltage. For example, the first electronic device 101 can confirm that the second voltage is 6.1V.

According to one embodiment, the first electronic device 101 may control the DC-DC converter 215 so that the DC-DC converter 215 outputs a voltage between the first voltage and the second voltage. For example, the first electronic device 101 may control the DC-DC converter 215 so that the output voltage (VOUT) of the DC-DC converter 215 has a voltage value between 6.1V and 7.2V. For example, the first electronic device 101 may determine the average value between 6.1V and 7.2V (e.g., 6.65V) as the output voltage (VOUT) of the DC-DC converter 215. Thereafter, the first electronic device 101 can wirelessly transmit power to the second electronic device 103 by applying the output voltage (VOUT) of the DC-DC converter 215 to the inverter 218.

According to one embodiment, the first electronic device 101 may set the value of the output voltage (VOUT) of the DC-DC converter 215 suitable for the second electronic device 103 in the initialization step. Additionally, the first electronic device 101 can set the value of the output voltage (VOUT) of the DC-DC converter 215 within a range that allows the second electronic device to control the rectified voltage at a certain level. Through this, the first electronic device 101 can perform a stable wireless charging operation for the second electronic device 103 having various types of loads and/or coils. Additionally, since the first electronic device 101 can perform a stable wireless charging operation for the second electronic device 103 having various types of loads and/or coils, charging compatibility can be increased.

According to one embodiment, while transmitting power to the second electronic device 103, the first electronic device 101 changes the coupling and/or changes the operating point. Even if the rectified voltage (VRECT) of ) is not properly controlled, the above-described operation can be performed repeatedly. The first electronic device 101 may set or adjust the value of the output voltage (VOUT) of the DC-DC converter 215 until the rectified voltage (VRECT) of the second electronic device 103 is stably controlled. .

The above-described first electronic device 101 and second electronic device 103 may be implemented in the same or similar manner as the following electronic devices 901, 902, and 904.

FIG. 9 is a block diagram of an electronic device 901 in a network environment 900, according to various embodiments.

Referring to FIG. 9, in the network environment 900, the electronic device 901 communicates with the electronic device 902 through a first network 998 (e.g., a short-range wireless communication network) or a second network 999. It is possible to communicate with at least one of the electronic device 904 or the server 908 through (e.g., a long-distance wireless communication network). According to one embodiment, the electronic device 901 may communicate with the electronic device 904 through the server 908. According to one embodiment, the electronic device 901 includes a processor 920, a memory 930, an input module 950, an audio output module 955, a display module 960, an audio module 970, and a sensor module ( 976), interface 977, connection terminal 978, haptic module 979, camera module 980, power management module 988, battery 989, communication module 990, subscriber identification module 996 , or may include an antenna module 997. In some embodiments, at least one of these components (eg, the connection terminal 978) may be omitted, or one or more other components may be added to the electronic device 901. In some embodiments, some of these components (e.g., sensor module 976, camera module 980, or antenna module 997) are integrated into one component (e.g., display module 960). It can be.

Processor 920 may, for example, execute software (e.g., program 940) to operate at least one other component (e.g., hardware or software component) of electronic device 901 connected to processor 920. It can be controlled and various data processing or calculations can be performed. According to one embodiment, as at least part of data processing or computation, the processor 920 stores commands or data received from another component (e.g., sensor module 976 or communication module 990) in volatile memory 932. The commands or data stored in the volatile memory 932 can be processed, and the resulting data can be stored in the non-volatile memory 934. According to one embodiment, the processor 920 may include a main processor 921 (e.g., a central processing unit or an application processor) or an auxiliary processor 923 that can operate independently or together (e.g., a graphics processing unit, a neural network processing unit ( It may include a neural processing unit (NPU), an image signal processor, a sensor hub processor, or a communication processor). For example, if the electronic device 901 includes a main processor 921 and a auxiliary processor 923, the auxiliary processor 923 may be set to use lower power than the main processor 921 or be specialized for a designated function. You can. The auxiliary processor 923 may be implemented separately from the main processor 921 or as part of it.

The auxiliary processor 923 may, for example, act on behalf of the main processor 921 while the main processor 921 is in an inactive (e.g., sleep) state, or while the main processor 921 is in an active (e.g., application execution) state. ), together with the main processor 921, at least one of the components of the electronic device 901 (e.g., the display module 960, the sensor module 976, or the communication module 990) At least some of the functions or states related to can be controlled. According to one embodiment, co-processor 923 (e.g., image signal processor or communication processor) may be implemented as part of another functionally related component (e.g., camera module 980 or communication module 990). there is. According to one embodiment, the auxiliary processor 923 (eg, neural network processing unit) may include a hardware structure specialized for processing artificial intelligence models. Artificial intelligence models can be created through machine learning. For example, such learning may be performed in the electronic device 901 itself on which the artificial intelligence model is performed, or may be performed through a separate server (e.g., server 908). Learning algorithms may include, for example, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning, but It is not limited. An artificial intelligence model may include multiple artificial neural network layers. Artificial neural networks include deep neural network (DNN), convolutional neural network (CNN), recurrent neural network (RNN), restricted boltzmann machine (RBM), belief deep network (DBN), bidirectional recurrent deep neural network (BRDNN), It may be one of deep Q-networks or a combination of two or more of the above, but is not limited to the examples described above. In addition to hardware structures, artificial intelligence models may additionally or alternatively include software structures.

The memory 930 may store various data used by at least one component (eg, the processor 920 or the sensor module 976) of the electronic device 901. Data may include, for example, input data or output data for software (e.g., program 940) and instructions related thereto. Memory 930 may include volatile memory 932 or non-volatile memory 934.

The program 940 may be stored as software in the memory 930 and may include, for example, an operating system 942, middleware 944, or application 946.

The input module 950 may receive commands or data to be used in a component of the electronic device 901 (e.g., the processor 920) from outside the electronic device 901 (e.g., a user). The input module 950 may include, for example, a microphone, mouse, keyboard, keys (eg, buttons), or digital pen (eg, stylus pen).

The sound output module 955 may output sound signals to the outside of the electronic device 901. The sound output module 955 may include, for example, a speaker or receiver. Speakers can be used for general purposes such as multimedia playback or recording playback. The receiver can be used to receive incoming calls. According to one embodiment, the receiver may be implemented separately from the speaker or as part of it.

The display module 960 can visually provide information to the outside of the electronic device 901 (eg, a user). The display module 960 may include, for example, a display, a hologram device, or a projector, and a control circuit for controlling the device. According to one embodiment, the display module 960 may include a touch sensor configured to detect a touch, or a pressure sensor configured to measure the intensity of force generated by the touch.

The audio module 970 can convert sound into an electrical signal or, conversely, convert an electrical signal into sound. According to one embodiment, the audio module 970 acquires sound through the input module 950, the sound output module 955, or an external electronic device (e.g., directly or wirelessly connected to the electronic device 901). Sound may be output through an electronic device 902 (e.g., speaker or headphone).

The sensor module 976 detects the operating state (e.g., power or temperature) of the electronic device 901 or the external environmental state (e.g., user state) and generates an electrical signal or data value corresponding to the detected state. can do. According to one embodiment, the sensor module 976 includes, for example, a gesture sensor, a gyro sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biometric sensor, It may include a temperature sensor, humidity sensor, or light sensor.

The interface 977 may support one or more designated protocols that can be used to connect the electronic device 901 directly or wirelessly with an external electronic device (e.g., the electronic device 902). According to one embodiment, the interface 977 may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.

The connection terminal 978 may include a connector through which the electronic device 901 can be physically connected to an external electronic device (eg, the electronic device 902). According to one embodiment, the connection terminal 978 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (eg, a headphone connector).

The haptic module 979 can convert electrical signals into mechanical stimulation (e.g., vibration or movement) or electrical stimulation that the user can perceive through tactile or kinesthetic senses. According to one embodiment, the haptic module 979 may include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

The camera module 980 can capture still images and moving images. According to one embodiment, the camera module 980 may include one or more lenses, image sensors, image signal processors, or flashes.

The power management module 988 can manage power supplied to the electronic device 901. According to one embodiment, the power management module 988 may be implemented as at least a part of, for example, a power management integrated circuit (PMIC).

The battery 989 may supply power to at least one component of the electronic device 901. According to one embodiment, the battery 989 may include, for example, a non-rechargeable primary cell, a rechargeable secondary cell, or a fuel cell.

Communication module 990 provides a direct (e.g., wired) communication channel or wireless communication channel between electronic device 901 and an external electronic device (e.g., electronic device 902, electronic device 904, or server 908). It can support establishment and communication through established communication channels. Communication module 990 operates independently of processor 920 (e.g., an application processor) and may include one or more communication processors that support direct (e.g., wired) communication or wireless communication. According to one embodiment, the communication module 990 is a wireless communication module 992 (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module 994 (e.g., : LAN (local area network) communication module, or power line communication module) may be included. Among these communication modules, the corresponding communication module is a first network 998 (e.g., a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network 999 (e.g., legacy It may communicate with an external electronic device 904 through a telecommunication network such as a cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., LAN or WAN). These various types of communication modules may be integrated into one component (e.g., a single chip) or may be implemented as a plurality of separate components (e.g., multiple chips). The wireless communication module 992 uses subscriber information (e.g., International Mobile Subscriber Identifier (IMSI)) stored in the subscriber identification module 996 within a communication network such as the first network 998 or the second network 999. The electronic device 901 can be confirmed or authenticated.

The wireless communication module 992 may support 5G networks after 4G networks and next-generation communication technologies, for example, NR access technology (new radio access technology). NR access technology provides high-speed transmission of high-capacity data (eMBB (enhanced mobile broadband)), minimization of terminal power and access to multiple terminals (mMTC (massive machine type communications)), or high reliability and low latency (URLLC (ultra-reliable and low latency). -latency communications)) can be supported. The wireless communication module 992 may support high frequency bands (e.g., mmWave bands), for example, to achieve high data rates. The wireless communication module 992 uses various technologies to secure performance in high frequency bands, for example, beamforming, massive array multiple-input and multiple-output (MIMO), and full-dimensional multiplexing. It can support technologies such as input/output (FD-MIMO: full dimensional MIMO), array antenna, analog beam-forming, or large scale antenna. The wireless communication module 992 may support various requirements specified in the electronic device 901, an external electronic device (e.g., electronic device 904), or a network system (e.g., second network 999). According to one embodiment, the wireless communication module 992 supports peak data rate (e.g., 20 Gbps or more) for realizing eMBB, loss coverage (e.g., 164 dB or less) for realizing mmTC, or U-plane latency (e.g., 164 dB or less) for realizing URLLC. Example: Downlink (DL) and uplink (UL) each of 0.5 ms or less, or round trip 1 ms or less) can be supported.

The antenna module 997 may transmit or receive signals or power to or from the outside (e.g., an external electronic device). According to one embodiment, the antenna module 997 may include an antenna including a radiator made of a conductor or a conductive pattern formed on a substrate (eg, PCB). According to one embodiment, the antenna module 997 may include a plurality of antennas (eg, an array antenna). In this case, at least one antenna suitable for the communication method used in the communication network, such as the first network 998 or the second network 999, is connected to the plurality of antennas by, for example, the communication module 990. can be selected Signals or power may be transmitted or received between the communication module 990 and an external electronic device through the selected at least one antenna. According to some embodiments, in addition to the radiator, other components (eg, radio frequency integrated circuit (RFIC)) may be additionally formed as part of the antenna module 997.

According to various embodiments, antenna module 997 may form a mmWave antenna module. According to one embodiment, a mmWave antenna module includes: a printed circuit board, an RFIC disposed on or adjacent to a first side (e.g., bottom side) of the printed circuit board and capable of supporting a designated high frequency band (e.g., mmWave band); And a plurality of antennas (e.g., array antennas) disposed on or adjacent to the second side (e.g., top or side) of the printed circuit board and capable of transmitting or receiving signals in the designated high frequency band. can do.

At least some of the components are connected to each other through a communication method between peripheral devices (e.g., bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)) and signal ( (e.g. commands or data) can be exchanged with each other.

According to one embodiment, commands or data may be transmitted or received between the electronic device 901 and the external electronic device 904 through the server 908 connected to the second network 999. Each of the external electronic devices 902 or 904 may be of the same or different type as the electronic device 901. According to one embodiment, all or part of the operations performed in the electronic device 901 may be executed in one or more of the external electronic devices 902, 904, or 908. For example, when the electronic device 901 must perform a function or service automatically or in response to a request from a user or another device, the electronic device 901 may perform the function or service instead of executing the function or service on its own. Alternatively, or additionally, one or more external electronic devices may be requested to perform at least part of the function or service. One or more external electronic devices that have received the request may execute at least part of the requested function or service, or an additional function or service related to the request, and transmit the result of the execution to the electronic device 901. The electronic device 901 may process the result as is or additionally and provide it as at least part of a response to the request. For this purpose, for example, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology can be used. The electronic device 901 may provide an ultra-low latency service using, for example, distributed computing or mobile edge computing. In another embodiment, the external electronic device 904 may include an Internet of Things (IoT) device. Server 908 may be an intelligent server using machine learning and/or neural networks. According to one embodiment, the external electronic device 904 or server 908 may be included in the second network 999. The electronic device 901 may be applied to intelligent services (e.g., smart home, smart city, smart car, or healthcare) based on 5G communication technology and IoT-related technology.

The first electronic device 101 that transmits power wirelessly according to an embodiment includes a DC-DC converter 215, an inverter 218, a power transmission circuit 212 including a coil 213, and a processor ( 220) may be included. The processor according to one embodiment may be configured to establish a communication connection with a second electronic device that wirelessly receives power. The processor according to one embodiment may be set to determine that the DC-DC converter outputs a reference voltage. The processor according to one embodiment sets the switching frequency of the inverter to the first frequency and sets the duty ratio of the inverter to the first duty ratio, and the second electronic device reduces the load of the second electronic device. It may be set to transmit a first message requesting to set the first load value through the communication connection. The processor according to one embodiment is based on transmitting the first power based on the reference voltage while setting the switching frequency to the first frequency and the duty ratio to the first duty ratio, The device may be set to receive a first packet containing information about power received in a first state in which the load is set to the first load value from the second electronic device. The processor according to an embodiment sets the second electronic device to check the first voltage at which the rectified voltage of the second electronic device is controlled to a specified voltage value in the first state, based on the first packet. It can be. Here, the first voltage may be a voltage output from the DC-DC converter and applied to the inverter. The processor according to one embodiment sets the switching frequency of the inverter to a second frequency and sets the duty ratio of the inverter to a second duty ratio, and the second electronic device transfers the load to the first duty ratio. It may be configured to transmit a second message requesting to set a second load value higher than the load value through the communication connection. The processor according to one embodiment is based on transmitting the second power based on the reference voltage while setting the switching frequency to the second frequency and the duty ratio to the second duty ratio, The device may be set to receive a second packet containing information about the power received in the second state in which the load is set to the second load value from the second electronic device. Based on the second packet, the processor according to an embodiment causes the second electronic device to check a second voltage at which the rectified voltage of the second electronic device is controlled to a specified voltage value in the second state. can be set. Here, the second voltage may be a voltage output from the DC-DC converter and applied to the inverter. The processor according to an embodiment may determine the output voltage of the DC-DC converter to be applied to the inverter based on the first voltage and the second voltage. The processor according to one embodiment, based on the output voltage. It may be set to wirelessly transmit power to the second electronic device through the power transmission circuit.

The first voltage according to an embodiment is the DC- where the rectified voltage of the second electronic device is controlled to the specified voltage value while the inverter operates based on the first frequency and the first duty ratio. This may be the maximum output voltage of the DC converter. The DC-DC converter in which the rectified voltage of the second electronic device is controlled to the specified voltage value while the second inverter according to an embodiment operates based on the second frequency and the second duty ratio. It may be the minimum output voltage of .

The processor according to one embodiment may be set to determine a voltage value between the first voltage and the second voltage as the output voltage.

The first frequency according to one embodiment may be the maximum frequency of the switching frequency. The second frequency according to one embodiment may be the minimum frequency of the switching frequency.

The switching frequency according to one embodiment may be a frequency that switches on/off a plurality of transistors included in the inverter.

The first packet according to one embodiment includes information about the power received by the second electronic device from the first electronic device in the first state, information requesting that the second electronic device change transmission power, Includes information about the required power requested by the second electronic device, or information about a first difference between the required power of the second electronic device and the power received by the second electronic device by the first power. can do. The second packet according to one embodiment includes information about the power received by the second electronic device from the first electronic device in the second state, information requesting that the second electronic device change transmission power, Contains information about the required power requested by the second electronic device, or information about a second difference between the required power of the second electronic device and the power received by the second electronic device by the second power. can do.

The processor according to an embodiment is set to check the first difference between the required power of the second electronic device and the power received by the second electronic device by the first power, based on the first packet. It can be.

The processor according to an embodiment is set to check a second difference between the required power of the second electronic device and the power received by the second electronic device based on the second packet. It can be.

The first packet and the second packet according to one embodiment may be implemented as a control error packet (CEP) specified in the WPC standard.

The first duty ratio according to one embodiment may be the minimum duty ratio of the inverter, and the second duty ratio may be the maximum duty ratio of the inverter.

The processor according to one embodiment may be set to check the output voltage of the DC-DC converter according to a designated cycle.

A method of operating a first electronic device 101 that wirelessly transmits power according to an embodiment may include forming a communication connection with a second electronic device 103 that wirelessly receives power. A method of operating the first electronic device according to an embodiment includes setting the switching frequency of the inverter 218 included in the first electronic device to the first frequency and setting the duty ratio of the inverter to the first duty ratio. , the second electronic device may include transmitting a first message requesting to set the load of the second electronic device to a first load value through the communication connection. The operating method of the first electronic device according to an embodiment is based on transmitting first power based on the reference voltage while setting the switching frequency to the first frequency and the duty ratio to the first duty ratio. Thus, the method may include receiving a first packet containing information about the power received in a first state in which the second electronic device sets the load to the first load value from the second electronic device. . A method of operating the first electronic device according to an embodiment includes, based on the first packet, the second electronic device controlling the rectified voltage of the second electronic device to a specified voltage value in the first state. 1May include an operation to check voltage. Here, the first voltage may be a voltage output from the DC-DC converter 215 of the first electronic device and applied to the inverter. A method of operating the first electronic device according to an embodiment includes setting the switching frequency of the inverter to a second frequency and setting the duty ratio of the inverter to a second duty ratio, and the second electronic device It may include transmitting a second message requesting to set the load to a second load value higher than the first load value through the communication connection. The operating method of the first electronic device according to an embodiment is based on transmitting second power based on the reference voltage while setting the switching frequency to the second frequency and the duty ratio to the second duty ratio. Thus, the method may include receiving a second packet containing information about the power received in a second state in which the second electronic device sets the load to the second load value from the second electronic device. . A method of operating the first electronic device according to an embodiment includes, based on the second packet, the second electronic device controlling the rectified voltage of the second electronic device to a specified voltage value in the second state. It may include an operation to check the second voltage. Here, the second voltage may be a voltage output from the DC-DC converter and applied to the inverter. A method of operating the first electronic device according to an embodiment includes determining the output voltage of the DC-DC converter included in the first electronic device to be applied to the inverter based on the first voltage and the second voltage. Can include actions. A method of operating the first electronic device according to an embodiment may include wirelessly transmitting power to the second electronic device based on the output voltage.

The first voltage according to one embodiment is the DC- where the rectified voltage of the second electronic device is controlled to the specified voltage value while the inverter operates based on the first frequency and the first duty ratio. This may be the maximum output voltage of the DC converter. The second voltage according to an embodiment is the DC- where the rectified voltage of the second electronic device is controlled to the specified voltage value while the inverter operates based on the second frequency and the second duty ratio. This may be the minimum output voltage of the DC converter.

The operation of determining the output voltage according to an embodiment may include determining a voltage value between the first voltage and the second voltage as the output voltage.

The first frequency according to one embodiment may be the maximum frequency of the switching frequency, and the second frequency may be the minimum frequency of the switching frequency.

The switching frequency according to one embodiment may be a frequency that switches on/off a plurality of transistors included in the inverter.

The first packet according to one embodiment includes information about the power received by the second electronic device from the first electronic device in the first state, information requesting that the second electronic device change transmission power, Includes information about the required power requested by the second electronic device, or information about a first difference between the required power of the second electronic device and the power received by the second electronic device by the first power. can do. According to one embodiment, the second packet includes information about the power received by the second electronic device from the first electronic device in the second state, and information requesting that the second electronic device change transmission power. , information about the required power requested by the second electronic device, or information about a second difference between the required power of the second electronic device and the power received by the second electronic device by the second power. It can be included.

The operation of checking the first voltage according to an embodiment is based on the first packet, and determines the difference between the required power of the second electronic device and the power received by the second electronic device by the first power. It may include an operation to check the difference. The operation of checking the second voltage according to an embodiment includes, based on the second packet, the difference between the required power of the second electronic device and the power received by the second electronic device through the second power. It may include an operation to check the secondary difference.

The first packet and the second packet according to one embodiment may be implemented as a control error packet (CEP) specified in the WPC standard.

The first duty ratio according to one embodiment may be the minimum duty ratio of the inverter, and the second duty ratio may be the maximum duty ratio of the inverter.

In the non-transitory recording medium 930 according to an embodiment, an operation of establishing a communication connection between a first electronic device 101 that transmits power wirelessly and a second electronic device 103 that wirelessly receives power, In a state where the first electronic device sets the switching frequency of the inverter 218 included in the first electronic device to the first frequency and sets the duty ratio of the inverter to the first duty ratio, the first electronic device , an operation of transmitting, by the second electronic device, a first message requesting to set the load of the second electronic device to a first load value through the communication connection, wherein the first electronic device sets the switching frequency to the first load value. Based on transmitting the first power based on the reference voltage with the duty ratio set to the first duty ratio and the duty ratio set to the first duty ratio, the second electronic device sets the load to the first load value. An operation of receiving a first packet containing information about power received in a first state from the second electronic device, wherein the first electronic device, based on the first packet, An operation of checking the first voltage at which the rectified voltage of the second electronic device is controlled to a specified voltage value in state 1, where the first voltage is output from the DC-DC converter 215 of the first electronic device and is output from the inverter. It is a voltage applied to the load, and in a state where the first electronic device sets the switching frequency of the inverter to the second frequency and sets the duty ratio of the inverter to the second duty ratio, the second electronic device An operation of transmitting a second message requesting to set a second load value higher than the first load value through the communication connection, wherein the first electronic device sets the switching frequency to a second frequency and the duty ratio Based on transmitting the second power based on the reference voltage while setting the second duty ratio, the second electronic device responds to the power received in the second state in which the load is set to the second load value. An operation of receiving a second packet containing information from the second electronic device, wherein the first electronic device, based on the second packet, determines that the second electronic device is in the second state. An operation of checking a second voltage at which the rectified voltage is controlled to a specified voltage value, where the second voltage is a voltage output from the DC-DC converter and applied to the inverter, and the first electronic device An operation of determining an output voltage of a DC-DC converter included in the first electronic device to be applied to the inverter based on the voltage and the second voltage, and the first electronic device, based on the output voltage, wirelessly Instructions for executing an operation to transmit power to the second electronic device can be stored.

Electronic devices according to various embodiments disclosed in this document may be of various types. Electronic devices may include, for example, portable communication devices (e.g., smartphones), computer devices, portable multimedia devices, portable medical devices, cameras, wearable devices, or home appliances. Electronic devices according to embodiments of this document are not limited to the above-described devices.

The various embodiments of this document and the terms used herein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various changes, equivalents, or replacements of the embodiments. In connection with the description of the drawings, similar reference numbers may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the above items, unless the relevant context clearly indicates otherwise. As used herein, “A or B”, “at least one of A and B”, “at least one of A or B”, “A, B or C”, “at least one of A, B and C”, and “A Each of phrases such as “at least one of , B, or C” may include any one of the items listed together in the corresponding phrase, or any possible combination thereof. Terms such as "first", "second", or "first" or "second" may be used simply to distinguish one component from another, and to refer to that component in other respects (e.g., importance or order) is not limited. One (e.g., first) component is said to be “coupled” or “connected” to another (e.g., second) component, with or without the terms “functionally” or “communicatively.” When mentioned, it means that any of the components can be connected to the other components directly (e.g. wired), wirelessly, or through a third component.

The term “module” used in various embodiments of this document may include a unit implemented in hardware, software, or firmware, and is interchangeable with terms such as logic, logic block, component, or circuit, for example. It can be used as A module may be an integrated part or a minimum unit of the parts or a part thereof that performs one or more functions. For example, according to one embodiment, the module may be implemented in the form of an application-specific integrated circuit (ASIC).

Various embodiments of the present document are one or more instructions stored in a storage medium (e.g., built-in memory 1036 or external memory 1038) that can be read by a machine (e.g., electronic device 1001). It may be implemented as software (e.g., program 1040) including these. For example, a processor (e.g., processor 1020) of a device (e.g., electronic device 1001) may call at least one command among one or more commands stored from a storage medium and execute it. This allows the device to be operated to perform at least one function according to the at least one instruction called. The one or more instructions may include code generated by a compiler or code that can be executed by an interpreter. A storage medium that can be read by a device may be provided in the form of a non-transitory storage medium. Here, 'non-transitory' only means that the storage medium is a tangible device and does not contain signals (e.g. electromagnetic waves), and this term refers to cases where data is semi-permanently stored in the storage medium. There is no distinction between temporary storage cases.

According to one embodiment, methods according to various embodiments disclosed in this document may be included and provided in a computer program product. Computer program products are commodities and can be traded between sellers and buyers. The computer program product may be distributed in the form of a machine-readable storage medium (e.g. compact disc read only memory (CD-ROM)) or via an application store (e.g. Play Store ^TM ) or on two user devices (e.g. It can be distributed (e.g. downloaded or uploaded) directly between smart phones) or online. In the case of online distribution, at least a portion of the computer program product may be at least temporarily stored or temporarily created in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

According to various embodiments, each component (e.g., module or program) of the above-described components may include a single or plural entity, and some of the plurality of entities may be separately placed in other components. there is. According to various embodiments, one or more of the components or operations described above may be omitted, or one or more other components or operations may be added. Alternatively or additionally, multiple components (eg, modules or programs) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each component of the plurality of components in the same or similar manner as those performed by the corresponding component of the plurality of components prior to the integration. . According to various embodiments, operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, or omitted. Alternatively, one or more other operations may be added.

101: First electronic device
103: Second electronic device
212: Power transmission circuit
215: DC-DC converter
218: inverter
220: processor

Claims (20)

In the first electronic device 101 that transmits power wirelessly,
DC-DC converter (215);
inverter (218);
Power transmission circuit 212 including a coil; and
Includes a processor 220, where the processor:
Establishing a communication connection with a second electronic device 103 that wirelessly receives power,
Determine that the DC-DC converter outputs a reference voltage,
With the switching frequency of the inverter set to the first frequency and the duty ratio of the inverter set to the first duty ratio, the second electronic device requests that the load of the second electronic device be set to the first load value. transmitting a first message through the communication connection,
Based on transmitting the first power while setting the switching frequency to the first frequency and the duty ratio to the first duty ratio, the second electronic device sets the load to the first load value. Receiving a first packet containing information about power received in state 1 from the second electronic device,
Based on the first packet, the second electronic device determines a first voltage at which the rectified voltage of the second electronic device is controlled to a specified voltage value in the first state, where the first voltage is the DC- It is the voltage output from the DC converter and applied to the inverter,
In a state where the switching frequency of the inverter is set to the second frequency and the duty ratio of the inverter is set to the second duty ratio, the second electronic device adjusts the load to a second load value higher than the first load value. Sending a second message requesting setup through the communication connection,
Based on transmitting the second power while setting the switching frequency to the second frequency and the duty ratio to the second duty ratio, the second electronic device sets the load to the second load value. Receiving a second packet containing information about power received in state 2 from the second electronic device,
Based on the second packet, the second electronic device determines a second voltage at which the rectified voltage of the second electronic device is controlled to a specified voltage value in the second state, where the second voltage is the DC -This is the voltage output from the DC converter and applied to the inverter,
Determining the output voltage of the DC-DC converter applied to the inverter based on the first voltage and the second voltage,
Based on the above output voltage. An electronic device configured to wirelessly transmit power to the second electronic device through the power transmission circuit. According to paragraph 1,
The first voltage is the maximum voltage of the DC-DC converter at which the rectified voltage of the second electronic device is controlled to the specified voltage value while the inverter operates based on the first frequency and the first duty ratio. is the output voltage,
The second voltage is the minimum voltage of the DC-DC converter at which the rectified voltage of the second electronic device is controlled to the specified voltage value while the inverter operates based on the second frequency and the second duty ratio. Electronic device whose output voltage is. The method of any one of claims 1 to 2, wherein the processor:
An electronic device configured to determine a voltage value between the first voltage and the second voltage as the output voltage. According to any one of claims 1 to 3,
The first frequency is the maximum frequency of the switching frequency, and the second frequency is the minimum frequency of the switching frequency. According to any one of claims 1 to 4,
The switching frequency is a frequency for switching on/off a plurality of transistors included in the inverter. According to any one of claims 1 to 5,
The first packet includes information about the power received by the second electronic device from the first electronic device in the first state, information requesting that the second electronic device change transmission power, and information about the power received by the second electronic device from the first electronic device. Contains information about the required power requested by, or information about a first difference between the required power of the second electronic device and the power received by the second electronic device by the first power,
The second packet includes information about the power received by the second electronic device from the first electronic device in the second state, information requesting that the second electronic device change transmission power, and information about the power received by the second electronic device from the first electronic device. An electronic device including information about the required power requested by or information about a second difference between the required power of the second electronic device and the power received by the second electronic device by the second power. The method of any one of claims 1 to 6, wherein the processor:
Based on the first packet, confirming a first difference between the required power of the second electronic device and the power received by the second electronic device using the first power,
An electronic device configured to check a second difference between the required power of the second electronic device and the power received by the second electronic device based on the second packet. According to any one of claims 1 to 7,
The first packet and the second packet are implemented as a control error packet (CEP) specified in the WPC standard. The method of any one of claims 1 to 8, wherein the processor:
The first duty ratio is the minimum duty ratio of the inverter, and the second duty ratio is the maximum duty ratio of the inverter. The method of any one of claims 1 to 9, wherein the processor:
An electronic device configured to check the output voltage of the DC-DC converter according to a specified period. In a method of operating a first electronic device 101 that transmits power wirelessly,
An operation of establishing a communication connection with a second electronic device 103 that wirelessly receives power;
Setting the DC-DC converter 215 included in the first electronic device to output a reference voltage;
In a state where the switching frequency of the inverter 218 included in the first electronic device is set to the first frequency and the duty ratio of the inverter is set to the first duty ratio, the second electronic device is connected to the load of the second electronic device. An operation of transmitting a first message requesting to set as a first load value through the communication connection;
Based on transmitting the first power based on the reference voltage with the switching frequency set to the first frequency and the duty ratio set to the first duty ratio, the second electronic device connects the load to the first load. An operation of receiving a first packet containing information about power received in a first state set to a value from the second electronic device;
Based on the first packet, the second electronic device checks the first voltage at which the rectified voltage of the second electronic device is controlled to a specified voltage value in the first state, where the first voltage is the DC -It is the voltage output from the DC converter and applied to the inverter;
In a state where the switching frequency of the inverter is set to the second frequency and the duty ratio of the inverter is set to the second duty ratio, the second electronic device adjusts the load to a second load value higher than the first load value. An operation of transmitting a second message requesting configuration through the communication connection;
Based on transmitting second power based on the reference voltage in a second state in which the switching frequency is set to the second frequency and the duty ratio is set to the second duty ratio, the second electronic device transfers the load to the second electronic device. An operation of receiving, from the second electronic device, a second packet containing information about the power received with the load value set to 2;
Based on the second packet, the second electronic device checks a second voltage at which the rectified voltage of the second electronic device is controlled to a specified voltage value in the second state; Here, the second voltage is a voltage output from the DC-DC converter and applied to the inverter,
determining an output voltage of a DC-DC converter included in the first electronic device to be applied to the inverter based on the first voltage and the second voltage; and
A method of operating an electronic device, including wirelessly transmitting power to the second electronic device based on the output voltage. According to clause 11,
The first voltage is the maximum output of the DC-DC converter where the rectified voltage of the second electronic device is controlled to the specified voltage value while the inverter operates based on the first frequency and the first duty ratio. is the voltage,
The second voltage is the rectified voltage of the second electronic device in the second state when the inverter operates based on the second frequency and the second duty ratio. A method of operating an electronic device in which the minimum output voltage of the DC-DC converter is controlled by a value. The method of any one of claims 11 to 12, wherein the operation of determining the output voltage comprises:
A method of operating an electronic device including determining a voltage value between the first voltage and the second voltage as the output voltage. According to any one of claims 11 to 13,
The first frequency is the maximum frequency of the switching frequency, and the second frequency is the minimum frequency of the switching frequency. According to any one of claims 11 to 14,
The switching frequency is a frequency for switching on/off a plurality of transistors included in the inverter. According to any one of claims 11 to 15,
The first packet includes information about the power received by the second electronic device from the first electronic device in the first state, information requesting that the second electronic device change transmission power, and information about the power received by the second electronic device from the first electronic device. Contains information about the required power requested by, or information about a first difference between the required power of the second electronic device and the power received by the second electronic device by the first power,
The second packet includes information about the power received by the second electronic device from the first electronic device in the second state, information requesting that the second electronic device change transmission power, and information about the power received by the second electronic device from the first electronic device. An operation of an electronic device that includes information about the required power requested by, or information about a second difference between the required power of the second electronic device and the power received by the second electronic device by the second power. method. According to any one of claims 11 to 16,
The operation of checking the first voltage includes, based on the first packet, checking the first difference between the required power of the second electronic device and the power received by the second electronic device by the first power. Includes movement,
The operation of checking the second voltage includes, based on the second packet, checking a second difference between the required power of the second electronic device and the power received by the second electronic device by the second power. A method of operating an electronic device that includes motion. According to any one of claims 11 to 17,
The first packet and the second packet are implemented as a control error packet (CEP) specified in the WPC standard. According to any one of claims 11 to 18,
The first duty ratio is the minimum duty ratio of the inverter, and the second duty ratio is the maximum duty ratio of the inverter. In the non-transitory recording medium 930,
An operation of establishing a communication connection between a first electronic device 101 that wirelessly transmits power and a second electronic device 103 that wirelessly receives power;
An operation of setting, by the first electronic device, a DC-DC converter 215 included in the first electronic device to output a reference voltage;
In a state where the first electronic device sets the switching frequency of the inverter 218 included in the first electronic device to the first frequency and sets the duty ratio of the inverter to the first duty ratio, the second electronic device transmitting a first message requesting to set the load of the second electronic device to a first load value through the communication connection;
Based on the first electronic device transmitting first power based on the reference voltage with the switching frequency set to the first frequency and the duty ratio set to the first duty ratio, the second electronic device An operation of receiving a first packet containing information about power received in a first state in which the device sets the load to the first load value from the second electronic device;
An operation of the first electronic device, based on the first packet, to check the first voltage at which the rectified voltage of the second electronic device is controlled to a specified voltage value in the first state, where The first voltage is a voltage output from the DC-DC converter and applied to the inverter;
In a state where the first electronic device sets the switching frequency of the inverter to the second frequency and the duty ratio of the inverter to the second duty ratio, the second electronic device adjusts the load to the first load value. transmitting a second message requesting to set a higher second load value through the communication connection;
Based on the first electronic device transmitting second power based on the reference voltage while setting the switching frequency to the second frequency and the duty ratio to the second duty ratio, the second electronic device Receiving a second packet containing information about power received in a second state in which the load is set to the second load value from the second electronic device;
An operation of the first electronic device, based on the second packet, to check a second voltage at which the rectified voltage of the second electronic device is controlled to a specified voltage value in the second state; Here, the second voltage is a voltage output from the DC-DC converter and applied to the inverter;
An operation of determining, by the first electronic device, an output voltage of a DC-DC converter included in the first electronic device to be applied to the inverter based on the first voltage and the second voltage; and
A recording medium storing instructions for the first electronic device to wirelessly transmit power to the second electronic device based on the output voltage.

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