KR101996022B1 - Wireless charging apparatus for using wireless charging zone of 3d form - Google Patents

Abstract

The present invention relates to a wireless charging device, comprising: a plurality of transmission coils disposed in a wireless charging space of a three-dimensional form; And at least one power supply for supplying current to the plurality of coils to perform wireless charging of the electronic device including a receiving coil located in a wireless charging space having a three-dimensional shape.

Description

WIRELESS CHARGING APPARATUS FOR USING WIRELESS CHARGING ZONE OF 3D FORM}

The following description relates to a wireless charging device using a wireless charging space in a three-dimensional form, specifically, a wireless charging environment that improves the efficiency of wireless charging than a method of wirelessly charging an electronic device through a conventional pad structure. It relates to a device for forming a.

In recent years, the number of users who use smart phones is easy to carry, and accordingly, smart phones are equipped with various additional functions such as Internet search, cameras, applications, etc. to satisfy various needs of users.

Here, the additional function mounted on the smartphone consumes a lot of battery included in the smartphone, and thus the user must continuously charge the battery included in the smartphone. In this case, the user charges the discharged battery using an adapter, and recently, the battery is discharged using the wireless charging technology to provide a better service to the user.

Here, the wireless charging technology charges the battery of the smart phone by using a transmission and reception resonator included in the smart phone and the wireless charging device. At this time, the transmission and reception resonator should be included in a small electronic device such as a smart phone to operate, the size of the transmission and reception resonator is miniaturized and implemented.

However, such a transmission and reception resonator has a feature that the transmission distance through which a current flows narrowly decreases as the size of the transmission and reception resonator decreases. In particular, when the diameter of the receiving resonator is D, it is difficult to design and manufacture a small resonator with a transmission distance (more than 80% of RF efficiency) and also corresponds to the diameter of the resonator, but even if such a resonator is developed, the transmission distance is limited to the diameter of the resonator. do.

In order to solve this problem, wireless charging technology using magnetic resonance has been proposed, but in general, wireless power transmission technology using magnetic resonance is reported to have a characteristic of medium-distance transmission of about 1m, and the diameter of the resonator is transmitted distance As it is a characteristic of the general technology to see the limitation of the situation is making a lot of efforts to expand it.

In addition, such a transmission distance problem is inevitable in the transmission distance limit in the magnetic resonance method by coupling the resonance mode. In other words, most researchers, published papers, and patents suggest that the most realistic transmission distance is recognized as the diameter of the resonator. In addition, wireless power transmission is performed only in a specific region where a transmission resonator is present, which is another feature and a constraint.

This problem refers to the transmission distance, but there is a problem that the efficiency is changed according to the distance of the transmission and reception resonator even within a certain transmission distance, especially the direction sensitive. For example, when the transmission and reception resonator is facing the front, the efficiency is maintained at the maximum efficiency, but when the reception resonator is inclined at 45 degrees or 90 degrees, the efficiency decreases rapidly.

The present invention can develop a wireless charging and energy transmission technology having more freedom in a specific area of the three-dimensional form in order to overcome the limitation that occurs in performing the conventional wireless charging through the pad structure.

The present invention can propose a structure of a resonant coil for implementing a wireless charging space in a three-dimensional space.

Wireless charging device according to an embodiment A plurality of transmitting coils disposed in the wireless charging space of the three-dimensional form; And at least one power supply for supplying current to the plurality of coils, and the plurality of transmission coils may include at least one pair of transmission coils disposed to face each other in the wireless charging space.

At least one pair of transmission coils according to an embodiment may form a uniform field on the wireless charging space by a current supplied from the at least one power source.

According to an embodiment, at least one pair of transmitting coils may form a uniform field in the same direction as that of at least one receiving coil in the wireless charging space having the three-dimensional shape.

The direction of at least one receiving coil according to an embodiment is a direction in which an induced current is formed in the receiving coil through coupling with one of the plurality of transmitting coils disposed in the three-dimensional wireless charging space. Can be represented.

The at least one power source may supply a current such that a phase of a current supplied between the at least one pair of transmission coils has a 90 degree difference.

At least one power source according to an embodiment may supply a current having the same phase or a different phase between a plurality of transmitting coils disposed in the wireless charging space.

The wireless charging apparatus according to an embodiment may further include at least one capacitor reducing the size of the transmitting coils or lowering the resonance frequency of the transmitting coils.

At least one capacitor may be located between the plurality of transmitting coils and at least one power source.

At least one power source may include an inverter for controlling a phase of a current supplied to the plurality of transmission coils.

An inverter according to an embodiment may control the phase of the current supplied to the transmitting coils in consideration of a slope between the transmitting coils and the receiving coils existing in the wireless charging space or a position of the receiving coils existing in the wireless charging space. Can be.

According to an embodiment, the current may include two or more phases having a phase difference or the same phase between at least one pair of transmission coils disposed in the wireless charging space.

The wireless charging apparatus according to an embodiment may further include a communicator for detecting an induced current formed in a transmission coil existing in the wireless charging space.

The inverter according to an embodiment may control the phase of the initially set current to be supplied to the transmitting coils based on the induced current sensed through the communicator.

In one embodiment, a wireless charging device includes: at least one pair of transmission coils disposed to face each other in a three-dimensional wireless charging space; A power supply including an inverter for controlling a phase of a current supplied to the plurality of transmission coils; At least one capacitor that reduces the size of the transmitting coils or lowers the resonant frequency of the transmitting coils; And a communicator configured to sense an induced current formed in a transmitting coil existing in the wireless charging space.

At least one pair of transmission coils according to an embodiment may form a uniform field on the wireless charging space by a current supplied from the at least one power source.

According to an embodiment, at least one pair of transmitting coils may form a uniform field in the same direction as that of at least one receiving coil in the wireless charging space having the three-dimensional shape.

At least one power source according to an embodiment may supply a current having the same phase or a different phase between a plurality of transmitting coils disposed in the wireless charging space.

An inverter according to an embodiment may control the phase of the current supplied to the transmitting coils in consideration of a slope between the transmitting coils and the receiving coils existing in the wireless charging space or a position of the receiving coils existing in the wireless charging space. Can be.

According to an embodiment, the current may include two or more phases having a phase difference or the same phase between at least one pair of transmission coils disposed in the wireless charging space.

The inverter according to an embodiment may control the phase of the initially set current to be supplied to the transmitting coils based on the induced current sensed through the communicator.

The wireless charging device according to an embodiment of the present invention utilizes a three-dimensional wireless charging space in which a plurality of transmission coils are disposed to all electronic devices (wearable devices, IoT devices, etc.) that can be located in the wireless charging space. Wireless charging of the battery of the electronic device may be performed using the included receiving coil.

Wireless charging device according to an embodiment of the present invention by controlling the satellite of the current supplied to the transmission coil in consideration of the inclination and direction of the receiving coil present in the wireless charging space, freely wireless charging at any position in the wireless charging space Can be done.

1 is an overall configuration diagram of a wireless charging apparatus using a wireless charging space in a three-dimensional form according to an embodiment.
2 is a diagram illustrating a transmission coil disposed in a wireless charging space according to an embodiment.
3 is a diagram illustrating a form of a transmission coil and a uniform field formed in the transmission coil according to an embodiment.
4 is a diagram for describing an operation of coupling between a receiving coil and a transmitting coil existing in a wireless charging space, according to an exemplary embodiment.
FIG. 5 is a diagram for describing an operation of coupling between a receiving coil and a transmitting coil existing in a wireless charging space according to another embodiment.
6 illustrates a transmission coil including a capacitor according to an embodiment.
7 is a diagram for describing an operation of canceling between magnetic fields formed in a transmitting coil disposed in a wireless charging space, according to an exemplary embodiment.
8 is a graph illustrating a change in efficiency according to a slope between a transmitting coil and a receiving coil, according to an exemplary embodiment.
FIG. 9 is a diagram illustrating an efficiency change for the canceled magnetic field mentioned in FIG. 7 according to an embodiment.
10 is a diagram illustrating characteristics of a phase change of a current supplied from a power source, according to an exemplary embodiment.
FIG. 11 is a diagram for describing an operation of controlling a phase of magnetic fields formed in transmission coils by using an inverter included in a power source, according to an exemplary embodiment.
12 is a diagram for describing a result of evaluating the effectiveness of a wireless charging device using a wireless charging space having a three-dimensional shape according to an embodiment.
FIG. 13 is a diagram comparing sizes of uniform fields formed in transmission coils disposed in a wireless charging space having a three-dimensional shape, according to an exemplary embodiment.
14 is a diagram illustrating a shape of a uniform field formed according to a phase of a current according to an embodiment.
15 is a flowchart illustrating a processor performed by a wireless charging apparatus according to an embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments of the present invention may be modified in various forms. To provide a more complete description of the present invention.

1 is an overall configuration diagram of a wireless charging apparatus using a wireless charging space in a three-dimensional form according to an embodiment.

Referring to FIG. 1, the wireless charging device 101 may be disposed on the wireless charging space 106 having a three-dimensional shape to perform wireless charging with an electronic device existing in the wireless charging space. To this end, the wireless charging device 101 is a power source 108 for supplying current to the transmitting coils 102, 103, 104, 105 and the transmitting coils disposed in the wireless charging space 106. , 109. In addition, the wireless charging device 101 is connected to the wireless charging space 106 of the three-dimensional form through the transmission coils 102, 103, 104, 105 and the power source 108, 109. It may be formed as an energy zone for wireless charging. In other words, the wireless charging device 101 forms a magnetic field in each of the transmission coils 102, 103, 104, and 105 disposed in the wireless charging space 106, and the wireless charging space 106 May be formed as an energy zone according to a uniform field by a magnetic field formed in each of the transmission coils 102, 103, 104, and 105. Here, the Quiet Zone may mean a magnetic field having a uniform energy density corresponding to the magnetic field formed in each of the transmission coils 102, 103, 104, and 105. That is, the uniform field is energy due to the densely formed magnetic field formed between the transmission coils 102, 103, 104, and 105 arranged side by side in the three-dimensional wireless charging space 106. It may mean a magnetic field having a uniform density.

In this case, the transmitting coils 102, 103, 104, and 105 may be disposed at various positions in consideration of a structure in which the wireless charging space 106 for forming an energy zone is implemented. For example, the transmission coils 102, 103, 104, and 105 may be disposed at various positions such as walls, ceilings, floors, and corners of the structure in consideration of a structure having a rectangular shape or a cylindrical shape. . Detailed configuration will be described with reference to FIG. 2.

In addition, the transmitting coils 102, 103, 104, and 105 are disposed in the wireless charging space 106 so that at least one pair is disposed to face each other in the wireless charging space 106. It may include the transmission coils of. That is, the transmitting coils 102, 103, 104, and 105 may have a plurality of pairs of transmitting coils. In one example, the wireless charging device 101 is disposed on each side of the wireless charging space 106 of the square structure, the four transmitting coils arranged in the wireless charging space 106 is one for the coil facing each other It may be implemented in the form of a pair.

Here, the present invention is formed in a specific space by forming a uniform field in the wireless charging space 106 by forming a uniform field in the wireless charging space 106 by using at least one pair of transmission coils facing each other. The efficiency of energy can be improved.

The transmitting coils 102, 103, 104, 105 can form a magnetic field by the current supplied from the power source 108, 109, and the transmitting coils 102, 103. , 104, 105 may be supplied with current from the same or different power sources 108, 109. In one example, the wireless charging device 101 in placing the transmitting coils 102, 103, 104, 105 in the wireless charging space 106, i) transmitting coils (103, 105) And ii) two pairs of transmission coils may be arranged in the transmission coils 102, 104.

Here, the transmitting coils 103 and 105 and the transmitting coils 102 and 104 have a more uniform uniform field when the phase of the current has a 90 degree difference in the current supplied from the power sources 108 and 109. Can be formed. That is, there may be a 90 degree phase difference between the current supplied to the transmitting coils 103 and 105 and the current supplied to the transmitting coils 102 and 104.

In addition, the pair of transmission coils 103 and 105 may receive current from the power source 108, and the other pair of transmission coils 102 and 104 may receive current from the power source 109. The transmitting coils 102, 103, 104, and 105 may receive current from the same power source or different power sources connected to receive the current. In addition, the power supplies 108 and 109 may transmit predetermined currents to the transmission coils 102, 103, 104, and 105.

The wireless charging device 101 may detect the presence of the receiving coil 107 existing in the wireless charging space 106. In other words, the wireless charging apparatus 101 may recognize an electronic device including the receiving coil 107 and determine whether the receiving coil 107 is present. For example, the wireless charging device 101 may detect an electronic device including a receiving coil 107 existing in the wireless charging space 106 based on a location-based communication technology. Here, the location-based communication technology may include Near Field Communications (NFC), Bluetooth (BlueTooth), Wi-Fi (Wi-Fi) and the like.

In addition, the wireless charging device 101 may detect an induced current formed in the receiving coil 107 which is coupled with at least one transmitting coil based on the receiving coil 107 existing in the wireless charging space 106. have. Specifically, the wireless charging device 101 is coupled according to the uniform field formed in at least one of the transmitting coils 102, 103, 104, 105 in the wireless charging space 106 As this occurs, the induced current formed in the receiving coil 107 can be detected.

The induced current formed in the receiving coil 107 is applied to the uniform fields formed in the transmitting coils 102, 103, 104, and 105 according to the preset currents supplied from the power sources 108 and 109. May be induced current. In addition, the induced current formed in the receiving coil 107 may represent different current values as the position of the receiving coil 107 changes in the wireless charging space 106.

As a result, the wireless charging device 101 transmits the coils 102 and 103 based on the induced current for the receiving coil 107 detected corresponding to the position of the receiving coil 107 in the wireless charging space 106. , Phases of the currents supplied to (104) and (105) can be changed. That is, the wireless charging device 101 may change the phase of the preset current with respect to the current generated from the power source to the phase of the current based on the induced current. In addition, the power supplies 108 and 109 may supply the current whose phase is changed to the transmission coils 102, 103, 104, and 105.

Then, the wireless charging device 101 is induced current induced in the receiving coil 107 by the uniform field formed in the transmitting coils 102, 103, 104, 105 by the phase change current Can be detected again. If the re-detected induction current is in a normal state, the wireless charging device 101 may proceed to charge the electronic device including the receiving coil 107 while maintaining the phase of the current. As a result, the wireless charging device 101 transmits currents having different phases according to the position of the receiving coil 107 in the wireless charging space 106 to the transmitting coils 102, 103, 104, and 105. By supplying with, it is possible to freely charge without limiting the wireless charging space 106.

The wireless charging technology using the wireless charging device 101 may be applied to various devices, in particular, a pad-type device such as a smart phone, and will have a profound effect on the activation of wearable devices and IoT devices in the future. . In particular, the wireless charging technology using the wireless charging device 101 is freely placed in a specific space for the small wearable devices that are difficult to wire-line charging and battery replacement, thereby automatically charging is performed, thereby providing ease of use. can do.

As a result, when the electronic device enters the three-dimensional wireless charging space having the X, Y, and Z axes using a wireless transmission scheme in a specific space, the three-dimensional X, Y, and Z axes constituting the wireless charging space are included. The battery of the electronic device may be automatically charged through resonance between the transmission coils disposed on one of the axes and the reception coil included in the electronic device.

2 is a diagram illustrating a transmission coil disposed in a wireless charging space according to an embodiment.

Referring to FIG. 2, the transmission coils may be disposed at various positions in the wireless charging space, and may form a uniform field on the wireless charging space by a current supplied from at least one power source.

Referring to FIG. 2A, the transmitting coils may be disposed on a wall, a ceiling, a floor, or the like of the wireless charging space. Here, the transmitting coils may be disposed on the ceiling and the floor facing each other, the wall facing each other.

Referring to (b) of Figure 2, the transmission coils may be disposed on each of the four walls constituting the wireless charging space. Here, one or more transmission coils may be disposed on one wall, thereby enlarging the area of the uniform field formed in the transmission coil. That is, the diagram shown in (b) of FIG. 2 is an extended concept in the configuration of forming a uniform field by using one transmitting coil, and the case where the area of the wireless charging space should be large or the current intensity should be stronger. In consideration of this, a plurality of transmission coils may be arranged.

Referring to FIG. 2C, the transmission coils may be disposed at each corner of the ceiling or each corner of the floor of the wireless charging space. Here, the transmission coils disposed in the three-dimensional wireless charging space may be arranged in various forms in addition to the example illustrated in FIG. 2. In addition, the present invention may include a structure for coupling a pair of transmission coils in parallel with the structure in series in the arrangement of the transmission coil. In the present invention, the resonance may be formed between the transmission coils by using self resonance or an additional Cap in forming the transmission coils.

3 illustrates a transmission coil and a magnetic field formed in the transmission coil, according to an exemplary embodiment.

3A may be a cross-sectional view illustrating a basic configuration of the transmitting coils 102, 103, 104, and 105 for forming the wireless charging space 106 having a three-dimensional shape. Based on the cross-sectional view, the wireless charging device may include a plurality of transmission coils 102, 103, 104, and 105 and at least one power source 108 and 109.

Here, the plurality of transmission coils (102, 103, 104, 105) may be disposed in the wireless charging space 106 of the three-dimensional form, at least one of which is disposed to face each other in the wireless charging space 106 A pair of transmitting coils can be implemented. Here, the arrangement structure on the wireless charging space 106 using the plurality of transmission coils 102, 103, 104, 105 is disposed in each section of the wireless charging space 106 having a region of a predetermined size, and the wireless charging space It may be a structure designed to maintain a constant efficiency within the 106.

In addition, this arrangement structure may be to receive the same induced current regardless of the position of the receiving coil when the receiving coil is present in the wireless charging space 106, that is, the dotted line in the cross-sectional view. In other words, the at least one pair of transmission coils 102, 103, 104, 105 arranged to face each other create a uniform field on the wireless charging space 106 by the current supplied from the power source 108, 109. Can be formed.

At this time, the power supplies 108 and 109 flow in the same direction to the pair of coils so as to form a uniform field on the three-dimensional wireless charging space existing between the coils arranged to face each other in pairs. Can be controlled. The at least one pair of transmitting coils 102, 103, 104, and 105 have a constant wavelength between the transmitting coil disposed in a pair and the transmitting coils as a controlled current is supplied to flow in the same direction from a power source. Magnetic field can be formed.

Accordingly, the wireless charging space 106 may be adjusted to a charging region having a constant energy density by the uniform field formed in the transmission coils 102, 103, 104, and 105. In this case, as the transmission coils 102, 103, 104, and 105 are implemented in at least one pair disposed to face each other, a uniform field is densely formed between the transmission coils implemented as a pair, thereby providing a more uniform shape. A magnetic field with an energy density of

The receiving coil can then be located in the wireless charging space 106 with a uniform energy density, so that the same inductive current can be provided by the transmitting coils 102, 103, 104, 105 regardless of the position in the space.

Referring to the cross-sectional view shown in (a) of FIG. 3, the pair of transmitting coils 102 and 104 form a uniform field in the horizontal direction, and the other pair of transmitting coils 103 and 105 are vertical. It may be a feature that is configured to form a uniform field in the direction. At this time, the power supply 109 connected to the transmission coils 102 and 104 and the power supply 108 connected to the transmission coils 103 and 105 may output current having the same phase.

Here, the current supplied to the transmission coils 103 and 105 and the current supplied to the transmission coils 102 and 104 shown in FIG. 3A may be supplied with currents having different phases. In other words, the present invention needs to adjust a uniform magnetic field in the wireless charging space to provide a normal charging function for the receiving coil located in the three-dimensional wireless charging space. Accordingly, assuming that the transmission coils 102, 103, 104, and 105 are disposed on four walls that constitute the wireless charging space, the present invention provides a pair of transmission coils 103. And the phase of the current supplied to the transmitting coil 105 in the same manner, and the phase of the current supplied to the transmitting coil 102 and the transmitting coil 104 which is paired with the transmitting coils 103 and 105. Can be set equally.

In addition, the present invention transmits the phase and the current of the current supplied to the transmission coils (103, 105) so that a phase difference of 90 degrees occurs in the current supplied to the transmission coils (102), (103), (104), and (105). The phase of the current supplied to the coils 102 and 104 may be set differently. In one example, the phase of the current supplied to the transmitting coils 103, 105 may represent 0 degrees, and the phase of the current supplied to the transmitting coils 102, 104 represents 90 degrees. A phase difference of 90 degrees may occur between the phase of the current supplied to the 103 and 105 and the phase of the current supplied to the transmitting coils 102 and 104.

Accordingly, when the transmitting coils 103 and 105 and the transmitting coils 102 and 104 are supplied with a current having a phase difference of 90 degrees than when the current is supplied with In-Phase, the maximum and minimum values of the current values are provided. The difference is small, and a denser uniform field can be formed in the wireless charging space.

3 (b) is a cross-sectional view showing the form of a uniform field formed between a pair of transmitting coils and the transmitting coils and a position of how the transmitting coils are connected.

The wireless charging device may supply current to the transmitting coil 105 ′ and the transmitting coil 105 ″ disposed in pairs in the same direction. In addition, the wireless charging device is a region where the distribution of the disturbance 107 is dotted by the current supplied to the transmitting coil 105 'and the transmitting coil 105' 'arranged in pairs, that is, the wireless charging space 106 ) Can be induced to form a uniform field.

3 (b) is a concept that is extended from (a) of FIG. 3, in which a plurality of transmitting coils are arranged in a certain section of the wireless charging space 106 and implemented as a pair. As a result, even when the direction of the receiving coil rotates by 90 degrees, the pair of coils is increased so that a uniform field is formed in the position of the receiving coil received by the transmitting coil.

4 is a diagram for describing an operation of coupling between a receiving coil and a transmitting coil existing in a wireless charging space, according to an exemplary embodiment.

Referring to FIG. 4, the wireless charging apparatus includes a receiving coil 107 as a coupling between a receiving coil 107 existing in the wireless charging space 106 and one transmitting coil of the transmitting coils 102, 103, 104, and 105 occurs. Induction current may be formed in 107. In this case, the wireless charging device may form a uniform field in the same direction as that of the at least one receiving coil 107 existing in the wireless charging space 106.

In detail, the wireless charging apparatus may determine a direction according to the position of the receiving coil 107 existing in the wireless charging space 106. The wireless charging device may form a uniform field in the same direction as the determined direction of the receiving coil 107.

In one example, the receiving coil 107 present in the wireless charging space 106 has a longitudinal direction and may be located adjacent to the transmitting coil 103 among the transmitting coils 102, 103, 104, 105. Accordingly, the wireless charging device may form a uniform length in the vertical direction by using the transmission coils 103 and 105. That is, the receiving coil 107 may be combined with the transmitting coils 103 and 105 which form a magnetic field in the longitudinal axis direction as the receiving coil 107 is positioned in the longitudinal direction in the wireless charging space 106. In addition, the transmitting coils 103 and 105 may receive most of the current from the power source 108.

In addition, the induction current may be formed in the reception coil 107 through resonance with the transmission coil 103 having a high coupling coefficient among the transmission coils 103 and 105. That is, the reception coil 107 may form an induced current by a transmission coil located closer to each other when combined with one transmission coil of the plurality of transmission coils. For example, the present invention may form an induced current due to a magnetic field induced in the receiving coil 107 by a uniform field formed in the transmitting coil 103.

FIG. 5 is a diagram for describing an operation of coupling between a receiving coil and a transmitting coil existing in a wireless charging space according to another embodiment.

Referring to FIG. 5, the wireless charging apparatus includes a receiving coil 107 as a coupling between a receiving coil 107 existing in the wireless charging space 106 and one transmitting coil of the transmitting coils 102, 103, 104, and 105 occurs. Induction current may be formed in 107. In this case, the wireless charging device may form a uniform field in the same direction as that of the at least one receiving coil 107 existing in the wireless charging space 106.

In detail, the wireless charging apparatus may determine a direction according to the position of the receiving coil 107 existing in the wireless charging space 106. The wireless charging device may form a uniform field in the same direction as the determined direction of the receiving coil 107.

In one example, the receiving coil 107 present in the wireless charging space 106 has a horizontal direction and may be located adjacent to the transmitting coil 104 among the transmitting coils 102, 103, 104, 105. Accordingly, the wireless charging device may form a uniform field in the horizontal direction by using the transmission coils 102 and 104. That is, the receiving coil 107 may be combined with the transmitting coils 102 and 104 forming a uniform length in the horizontal direction as the receiving coil 107 is positioned in the horizontal direction in the wireless charging space 106. Here, the transmitting coils 102 and 104 may receive most of the current from the power source 109.

That is, the induction current may be formed in the reception coil 107 through resonance with the transmission coil 104 having a high coupling coefficient among the transmission coils 102 and 104. For example, the present invention may form an induced current due to a magnetic field induced in the receiving coil 107 by a uniform field formed in the transmitting coil 104.

6 illustrates a transmission coil including a capacitor according to an embodiment.

Referring to FIG. 6, the wireless charging apparatus may include at least one capacitor that reduces the size of the transmitting coils 102, 103, 104, 105 or lowers the resonance frequency of the transmitting coils 102, 103, 104, 105. Capacitor 601) may be further included. At least one capacitor 601 may be located between the plurality of transmission coils 102, 103, 104, 105 and at least one power source, and the transmission coils 102, 103, 104 connected with the capacitor 601. , 105 may be the resonance frequency is lowered by the capacitor 601.

In other words, the transmitting coils 102, 103, 104, 105 may generally form a uniform field according to the resonant frequency corresponding to the current supplied from the power source. In this case, the transmission coils 102, 103, 104, and 105 connected to the capacitor 601 may filter the current supplied from the power supply by the capacitor 601, thereby lowering the resonance frequency due to the current.

7 is a diagram for describing an operation of canceling between magnetic fields formed in a transmitting coil disposed in a wireless charging space, according to an exemplary embodiment.

Referring to FIG. 7, the wireless charging device may have a position where the uniform field formed by the transmission coils 102, 103, 104, and 105 disposed in the wireless charging space 106 is not transmitted. In other words, when the receiving coil 107 is located at each corner of the wireless charging space 106 as shown in FIG. 7, the receiving coil 107 is formed in the transmitting coils 102, 103, 104, 105. It may not be possible to transmit a uniform field.

This is because the uniform field is canceled by at least one pair of transmission coils. In other words, as the uniform fields formed between the transmitting coils 102 and 104 and the transmitting coils 103 and 105 are formed to cross each other, an offset may occur between the uniform fields. As a result, a point at which transmission for the uniform field formed in the transmission coils 102, 103, 104, and 105 may be impossible with respect to a specific point of the wireless charging space 106 may occur.

Therefore, by controlling the phase of the current supplied from the power source, the present invention can create an environment to enable charging in all the wireless charging space 106 without a point where transmission for the uniform field is impossible. Detailed configuration thereof will be described continuously with reference to FIGS. 8 to 10.

8 is a graph illustrating a change in efficiency according to a slope between a transmitting coil and a receiving coil, according to an exemplary embodiment.

8 may be a graph illustrating a change in efficiency according to a slope between the transmitting coil and the receiving coil 802. Accordingly, the wireless charging device may consider the slope between the transmitting coils and the receiving coil 802 present in the wireless charging space.

Specifically, referring to the graph of FIG. 8, assuming that the transmitting coils are disposed at the bottom 801 of the wireless charging space 106, the wireless charging device has a θ of 90 when the receiving coil 802 is inclined at an θ angle. In the region of degrees, the efficiency of energy transfer can be the lowest.

FIG. 9 is a diagram illustrating an efficiency change for the canceled magnetic field mentioned in FIG. 7 according to an embodiment.

9 illustrates a case where the efficiency of energy due to the canceled magnetic field mentioned in FIG. 7 decreases rapidly. Specifically, the present invention simulates the reception efficiency with respect to energy while varying the angle of the receiving coil 905 in the wireless charging space. Accordingly, referring to the drawing of FIG. 9, it can be seen that the receiving coil 905 generates a null point at a specific θ angle (−45 degrees).

This phenomenon is a phenomenon commonly occurring at the corners of the rectangular structure, and may be a problem due to the offset between magnetic fields as described in the drawing of FIG. 7. Accordingly, the present invention can solve the problem of canceling between the magnetic field by controlling the phase of the current supplied from the power source.

10 is a diagram illustrating characteristics of a phase change of a current supplied from a power source, according to an exemplary embodiment.

FIG. 10 shows the efficiency change characteristics of the existing null point when the phases of the currents supplied to the transmitting coils 902 and 901 in FIG. 9 actually differ by 90 degrees. have.

This efficiency change characteristic is that when the conventional null point value at the θ angle (-45 degrees) gives the phase of the current supplied to the transmitting coils 902 and 901 as compared to the transmitting coils 903 and 904. It can be seen that the efficiency is improved. This shows that the energy zone, or wireless charging space, can be improved by changing the phase of the current supplied to the transmitting coil when the energy zone, or the wireless charging space, is created with the cubic structure.

As described with reference to FIG. 3, according to the present invention, the transmitting coils 901 and 902 and the transmitting coils 903 and 904 receive a current having a phase difference of 90 degrees than when the current is supplied to In-Phase. When the difference between the maximum value and the minimum value of the current is small, a more compact uniform field can be formed in the wireless charging space.

FIG. 11 is a diagram for describing an operation of controlling a phase of magnetic fields formed in transmission coils by using an inverter included in a power source, according to an exemplary embodiment.

Referring to FIG. 11, the wireless charging device may supply current having two phase signals to the transmission coils 102, 103, 104, and 105 using one inverter 1101. In addition, the transmission coils 103 and 105 and the transmission coils 102 and 104 may represent phase differences of different currents by currents supplied from the inverters 1101.

Specifically, in one inverter 1101, a current including a signal having two phases different from each other is generated, and a current including each of the two signals is generated in the same in phase with the transmitting coils 103 and 105 as shown. The power is supplied to the transmission coils 102 and 104 and the current of the signal having another phase may be supplied in phase between the transmission coils implemented in two pairs. Here, the present invention may include a direct feeding method for feeding a current directly to the transmitting coil, and a structure for adding a feeding coil for feeding the current indirectly to the transmitting coil in the method for feeding the transmitting coil. In addition, in the present invention, a current may be supplied by having the same phase or phase difference between a pair of transmission coils and a pair of different transmission coils.

In this case, in the present invention, the receiver coil 107 grasps the position and the angle at which the null point occurs on the wireless charging space 106, and the inverter 1101 is in phase in consideration of the time point at which the null point is generated. Current may be formed to feed the transmission coils 102, 103, 104, 105.

In addition, according to the present invention, when a current formed in phase is supplied to the transmission coils 102, 103, 104, and 105, a time point at which a null point is generated may disappear. That is, according to the present invention, as the magnetic field is transmitted to the time point at which the null point is generated, the time point at which the null point is generated may disappear.

In this case, the present invention may increase the number of the transmitting coils (102, 103, 104, 105) in consideration of the case of two or more receiving coils, through which the transmission coils (102, 103, 104, 105) If the magnetic field to be formed is more tightly defined, it is possible to solve the null point occurrence in the plurality of receiving coils.

In addition, the present invention can solve the generation of null points in the plurality of receiving coils even by using a method of time-dividing on / off the resonance period formed in the receiving coil.

12 is a diagram for describing a result of evaluating the effectiveness of a wireless charging device using a wireless charging space having a three-dimensional shape, according to an exemplary embodiment.

Referring to FIG. 12, this may be a result of evaluating the effectiveness of the wireless charging device using the wireless charging space having a three-dimensional shape. Specifically, the present invention is a prototype of a wireless charging space having a cubic structure of 30 cm 30 cm 30 cm 3 to evaluate the effectiveness of the proposed technique mentioned above. For this purpose, the fabricated transmission module is an inverter, which is a switch amplifier structure that can operate in the 300kHz band, and the prototype used two inverters to give a phase difference. The receiver consists of a rectifier circuit with a full bridge structure.

In order to evaluate the actual system of the present invention, the measurement was made with DC to DC efficiency. In addition, the transmitting coil is placed in various positions such as middle left, middle center, middle right, front bottom, and middle bottom in the wireless charging space, and measurement is performed accordingly. In each position, the angle of the receiving coil is 0 degrees, 45 degrees, The measurement was made while rotating at 90 degrees and 135 degrees.

In addition, the present invention was measured while transitioning the inverter 0 degrees, 90 degrees, 180 degrees at each position, rotation angle. Accordingly, as shown in FIG. 12, the present invention can obtain an optimum efficiency when the inverter is changed to 0 degrees, 90 degrees, and 180 degrees for one position and one rotation angle, and solves a problem in which the efficiency drops sharply. Is showing.

FIG. 13 is a diagram comparing sizes of uniform fields formed in transmission coils disposed in a wireless charging space having a three-dimensional shape, according to an exemplary embodiment.

Referring to FIG. 13, the present invention simulates a uniformly expanding operation of a constant energy density within a wireless charging space. At this time, the present invention can create an environment having the following conditions to perform the simulation. Specifically, the present invention can form a wireless charging space of the cube. In the present invention, the transmitting coils may be disposed on four wall surfaces forming the wireless charging space of the cube. The transmitting coils may be implemented as at least one pair of transmitting coils facing each other according to positions disposed on four wall surfaces. That is, referring to FIG. 13, the transmission coil 1 and the transmission coil 2 may be implemented in one pair, and the transmission coil 3 and the transmission coil 4 may be implemented in one pair.

In addition, the present invention supplies a current in phase to a pair of transmission coils (transmission coil 1 and transmission coil 2) facing each other, a pair facing each other different from the transmission coils (transmission coil 1 and transmission coil 2) It is possible to compare the magnitude of the uniform field generated in the wireless charging space when a current having an in-phase or 90 degree phase is supplied between the transmitting coils (transmitting coil 3 and transmitting coil 4).

As a result, the present invention is the same for both the in-phase feeding and the 90-degree phase shift feeding to two pairs of transmitting coils (transmitting coil 1 and transmitting coil 2) and (transmitting coil 3 and transmitting coil 4) facing each other. The simulation environment was created to apply. In addition, the present invention corresponds to two pairs of transmitting coils (transmitting coil 1 and transmitting coil 2) and (transmitting coil 3 and transmitting coil 4) to which 1A is applied based on the created simulation environment (a) of FIG. And (b) confirm the distribution of the uniform field according to the result.

Specifically, the diagram of FIG. 13A shows two pairs of transmission coils (transmission coil 1 and transmission coil 2) and (transmission coil 3 and transmission coil 4) facing each other according to in-phase feeding. 1A is applied, which may represent a distribution of uniform fields formed in the wireless charging space.

At this time, as described above, 1A may be applied to the current supplied to the transmission coil 1 and the transmission coil 2 and the current supplied to the transmission coil 3 and the transmission coil 4, and may exhibit the same phase. In other words, when the phase of the preset current is 0 degrees, the present invention can supply the current having the same phase 0 to the transmitting coil 1 and the transmitting coil 2, the transmitting coil 3 and the transmitting coil 4. That is, the present invention can feed in phase with respect to the current supplied to the transmission coil 1, the transmission coil 2, and the transmission coil 3 and the transmission coil 4.

The transmitting coils 1 to 4 may form a uniform field in the wireless charging space in response to the same-phase current supplied in the same manner. In this case, the uniform field formed in the wireless charging space may be formed in the wireless charging space in a curved shape in a direction of an angle according to the phase of the same current.

On the other hand, the diagram of FIG. 13 (b) shows a 90 degree phase shift feeding of two pairs of transmission coils (transmission coil 1 and transmission coil 2) and (transmission coil 3 and transmission coil 4) facing each other. As 1 A is applied, it may represent a distribution of the uniform field formed thereby.

At this time, as described above, 1A may be applied to the currents supplied to the transmission coil 1 and the transmission coil 2 and the current supplied to the transmission coil 3 and the transmission coil 4, and may exhibit different phases. In other words, the present invention can be controlled so that the phases of the currents supplied to the transmitting coil 1 and the transmitting coil 2 have 0 degrees, and the phases of the currents supplied to the transmitting coil 3 and the transmitting coil 4 have 90 degrees. In the present invention, the transmitting coil 1 and the transmitting coil 2, the transmitting coil 3, and the transmitting coil 4 having a phase difference of 90 degrees can form a uniform field of constant energy density in the wireless charging space.

As a result, according to the present invention, when the current having a phase difference of 90 degrees is supplied to the transmitting coil 1, the transmitting coil 2, the transmitting coil 3, and the transmitting coil 4 in-phase, as shown in FIG. There is less difference between the maximum value and the minimum value for the value of, and a more compact uniform field can be formed in the wireless charging space.

Looking at the results according to the simulation of the present invention according to Figures 13 to 14, in-phase feeding to two pairs of transmission coils (transmission coil 1 and transmission coil 2), (transmission coil 3 and transmission coil 4). The uniform field may be distributed within the wireless charging space at 0.000269 A / m to 6.109 A / m. In the case of two pairs of transmitting coils (transmitting coil 1 and transmitting coil 2) and (transmitting coil 3 and transmitting coil 4) that perform 90 degree phase shift, they are within the wireless charging space at 0.64 A / m to 4.52 A / m. Uniform fields may be distributed.

As a result, the present invention provides a method for transmitting coils disposed in a wireless charging space, between a pair of different transmitting coils (transmitting coil 1 and transmitting coil 2, transmitting coil 3 and transmitting coil, rather than performing in-phase feeding). When the phase of the current supplied to 4) has a phase difference of 90 degrees, it is possible to form a uniform field having a maximum charging effect. That is, according to the present invention, when the phase of the current supplied between the pair of different transmission coils is shifted by 90 degrees, the magnetic field formed in the transmission coil can be made uniform.

Forming a denser uniform field in the wireless charging space may mean that a charging space is formed in which a current induction of a predetermined magnitude may be formed regardless of the position and direction of the receiving coil existing in the wireless charging space.

15 is a flowchart illustrating a processor performed by a wireless charging apparatus according to an embodiment.

In operation 1501, the wireless charging apparatus may detect whether a receiving coil is present in the wireless charging space in a situation where a plurality of transmitting coils and power sources are arranged in the wireless charging space. In this case, the wireless charging device maintains the initial standby state, and when the receiving coil is present in the wireless charging space, the wireless charging device may perform the charging operation accordingly.

In operation 1502, when the receiving coil is detected in the wireless charging space, the wireless charging device may form a uniform field on the wireless charging space by supplying a predetermined current to a plurality of transmitting coils. In other words, the wireless charging device can supply current to the plurality of transmission coils by switching the state of the inverter which is kept in the initial standby state. In this case, the inverter may supply a current set to the same phase or different phases to the plurality of transmission coils. Here, when the inverter operates in the initial standby state, the inverter operates in the power feeding mode with the same phase.

In operation 1503, the wireless charging device may supply a current including two signals having the same phase to the plurality of transmission coils.

In operation 1505, the wireless charging device may detect a value of an induced current formed in the receiving coil by the current supplied to the plurality of transmitting coils.

When the value of the detected induced current is low, the wireless charging device may be fed back to switch the state of the inverter so that it can be fed by reversing the phase of the inverter in reverse phase. In other words, the phase of the current supplied to the transmitting coils may be changed based on the value of the induced current formed in the receiving coil. The wireless charging device 101 may change the phase of the preset current with respect to the current generated from the power source to the phase of the current based on the induced current. In the case of supplying currents set to different phases, in operation 1504, the wireless charging device may supply a current including two signals having different phases to the plurality of transmission coils.

Thereafter, the wireless charging device may redetect the induced current induced in the receiving coil by the uniform field formed in the transmitting coils by the phase changed current.

If the detected value of induced current is normal, the wireless charging device may maintain the inverter phase state at step 1506.

In operation 1507, the wireless charging device may transmit energy to the receiving coil in response to the phase of the current supplied from the inverter to be maintained, thereby completing the charging of the receiving coil.

As a result, the present invention, when the three-dimensional space wireless charging to determine the receiving power (induction current) from time to time for the receiving coil placed in a specific space, position, rotation angle environment so that the receiving coil can receive energy normally Can be formulated.

Methods according to an embodiment of the present invention can be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

101: wireless charging device
102 to 105: transmission coil
106: three-dimensional wireless charging space
107: Receive coil, a form in which the receiving coil is included in the electronic device
108 and 109: power

Claims (20)

A first transmission coil pair and a second transmission coil pair disposed in the three-dimensional wireless charging space; And
At least one power supply for supplying current to the first transmission coil pair and the second transmission coil pair
Inverter for controlling the phase of the current supplied to the first transmission coil pair and the second transmission coil pair
Including,
Two transmission coils constituting the first transmission coil pair and two transmission coils constituting the second transmission coil pair,
Arranged to face each other for the same transmission coil pair in the wireless charging space,
Two transmission coils constituting the first transmission coil pair and two transmission coils constituting the second transmission coil pair are supplied with current in the same phase with respect to the same transmission coil pair to form a uniform field in the wireless charging space,
The current supplied to the two transmission coils constituting the first transmission coil pair represents a phase difference of 90 degrees with the current supplied to the two transmission coils constituting the second transmission coil pair,
The wireless charging device determines a direction of a receiving coil indicating a direction in which an induced current is formed in the receiving coil through coupling with a first transmitting coil pair and a second transmitting coil pair disposed in the three-dimensional wireless charging space. and,
The direction of the receiving coil is determined as a direction according to the position of the receiving coil existing in the wireless charging space,
The first transmitting coil pair and the second transmitting coil pair form a uniform field in the same direction as the direction of the receiving coil,
The inverter,
The induced power generated in the receiving coil is greater than a preset value according to the slope between the first transmitting coil pair and the second transmitting coil pair and the receiving coil existing in the wireless charging space or the position of the receiving coil existing in the wireless charging space. Wireless charging device that controls to change the phase of the current supplied to the first transmission coil pair and the second transmission coil pair when low. delete delete delete delete delete The method of claim 1,
At least one capacitor reducing the size of the transmitting coils or lowering the resonant frequency of the transmitting coils
Wireless charging device further comprising. The method of claim 7, wherein
The at least one capacitor,
The wireless charging device located between the first transmission coil pair and the second transmission coil pair and at least one power source. delete delete delete The method of claim 1,
Communication device for sensing the induced current formed in the receiving coil of the electronic device present in the wireless charging space
Wireless charging device further comprising. The method of claim 12,
The inverter,
And wirelessly control a phase of a current initially set to be supplied to the first transmission coil pair and the second transmission coil pair based on the induced current sensed through the communicator. A first transmission coil pair and a second transmission coil pair disposed to face each other in the three-dimensional wireless charging space;
A power supply including an inverter controlling an phase of a current supplied to the first transmission coil pair and the second transmission coil pair;
At least one capacitor that reduces the size of the first transmission coil pair and the second transmission coil pair or lowers the resonant frequency of the first transmission coil pair and the second transmission coil pair
Communication device for sensing the induced current formed in the receiving coil of the electronic device present in the wireless charging space
Including,
Two transmission coils constituting the first transmission coil pair and two transmission coils constituting the second transmission coil pair are arranged to face each other for the same transmission coil pair in the wireless charging space,
Two transmission coils constituting the first transmission coil pair and two transmission coils constituting the second transmission coil pair are supplied with current in the same phase with respect to the same transmission coil pair to form a uniform field in the wireless charging space,
The current supplied to the two transmission coils constituting the first transmission coil pair represents a phase difference of 90 degrees with the current supplied to the two transmission coils constituting the second transmission coil pair,
The wireless charging device determines a direction of a receiving coil indicating a direction in which an induced current is formed in the receiving coil through coupling with a first transmitting coil pair and a second transmitting coil pair disposed in the three-dimensional wireless charging space. and,
The direction of the receiving coil is determined as a direction according to the position of the receiving coil existing in the wireless charging space,
The first transmitting coil pair and the second transmitting coil pair form a uniform field in the same direction as the direction of the receiving coil,
The inverter,
The induced power generated in the receiving coil is greater than a preset value according to the slope between the first transmitting coil pair and the second transmitting coil pair and the receiving coil existing in the wireless charging space or the position of the receiving coil existing in the wireless charging space. Wireless charging device that controls to change the phase of the current supplied to the first transmission coil pair and the second transmission coil pair when low. delete delete delete delete delete delete

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