TWI425349B - Electronic device and power supply thereof - Google Patents

Description

Electronic device and its power supply device

The present invention relates to the field of electronic technologies, and in particular, to an electronic device and a power supply device thereof.

The electric appliance generally uses the commercial power as an external power supply, and its internal circuit is composed of various control chips and other electronic components. In general, the mains is AC and the voltage is high. For example, the mains voltage in mainland China is 220 volts. However, the control chips and other electronic components inside the appliance generally operate under DC low voltage. Therefore, the rectifying filter and the transformer device are generally used in the electric appliance to convert the commercial power into an operating voltage suitable for controlling components such as a wafer.

Currently, rectification filtering is usually implemented using a rectifier bridge and a capacitor. When the appliance starts working, the AC voltage is first rectified by the rectifier bridge, then filtered by the capacitor, and then supplied as a working voltage to the load. However, when the appliance stops working, the voltage across the capacitor used for filtering is too late to be released, and the amount of power stored by the capacitor will take a long time to be released. Previously, the amount of power that was not released in the capacitor would affect the state of some of the logic components in the appliance, such as the flip-flop, so that the operating state of these logic components could not be restored to their original state until the next start of the appliance. This situation can cause unforeseen errors in the next start of the appliance.

In view of this, it is necessary to provide an electronic device to ensure that the electronic device is restored to its initial state after power failure. Power supply unit.

In addition, it is also necessary to provide an electronic device that can restore the initial state after power is turned off.

A power supply device for receiving an external voltage to provide a first operating voltage to a load and a second operating voltage to a control module. The control module receives the second operating voltage to provide a control signal to the load. The load operates under the first operating voltage and the control signal. The power supply device includes a power conversion module for converting the external voltage to the second operating voltage. The power supply device further includes a delay module, the delay module provides the second operating voltage to the control module when receiving the external voltage, and continues for a predetermined period of time when the external voltage is stopped. Providing the second operating voltage to the control module, and stopping providing the second operating voltage to the control module after the predetermined period of time.

An electronic device includes a power supply device, a control module, and a load. The power supply device is configured to receive an external voltage to provide a first operating voltage to the load and a second operating voltage to the control module. The control module receives the second operating voltage to provide a control signal to the load. The load operates under the first operating voltage and the control signal. The power supply device includes a power conversion module for converting the external voltage to the second operating voltage. The power supply device further includes a delay module, the delay module provides the second operating voltage to the control module when receiving the external voltage, and continues for a predetermined period of time when the external voltage is stopped. Providing the second operating voltage to the control module, and stopping providing the second operating voltage to the control after the predetermined period of time.

The electronic device and the power supply device enable the delay module to continue to supply the control module with the second operating voltage for a predetermined period of time from the moment of receiving the external voltage by setting a delay module. The electricity in the electrical storage component of the electronic device during the predetermined time period The amount is exhausted by the load. Therefore, the electronic device can resume the initial working state before the next work.

100‧‧‧Power supply unit

110‧‧‧Power Conversion Module

120‧‧‧Delay module

121‧‧‧Sensor unit

122‧‧‧Power supply unit

123‧‧‧Delay unit

124‧‧‧Output unit

125‧‧‧output

126‧‧‧zero equipotential point

200‧‧‧Control Module

300‧‧‧load

400‧‧‧External power supply

999‧‧‧Electronic equipment

R1, R2, R3, R4, R5, R6, R7‧‧‧ resistance

Q1, Q2, Q3‧‧‧ Triode

D‧‧‧ diode

C1, C2‧‧‧ capacitor

U‧‧‧ coupler

U11‧‧‧Lighting elements

U12‧‧‧Photosensitive elements

FIG. 1 is a functional block diagram of an electronic device according to a preferred embodiment.

2 is a circuit configuration diagram of a power supply device according to a preferred embodiment.

FIG. 1 is a functional block diagram of an electronic device 999 of a preferred embodiment. The electronic device 999 receives an external voltage from the external power source 400 to complete the corresponding operation. The electronic device 999 includes a power supply device 100, a control module 200, and a load 300. The power supply device 100 receives the external voltage to provide a first operating voltage to the load 300 and a second operating voltage to the control module 200. The control module 200 receives the second operating voltage and outputs a control signal to the load 300. The load 300 is responsive to the control signal and begins to operate under the drive of the first operating voltage.

The power supply device 100 includes a power conversion module 110 and a delay module 120. The power conversion module 110 converts the external voltage into the first operating voltage. The delay module 120 receives the external voltage and generates the second operating voltage. The power conversion module 110 uses a filter capacitor to perform correlation filtering processing. When the external power source 400 stops supplying the external voltage to the electronic device 999, the delay module 120 continues to supply the second operating voltage to the control module 200 for a predetermined period of time from the moment when the external voltage is stopped. During the predetermined time period, the amount of power in the filter capacitor or other power storage component in the power conversion module 110 is depleted by the load 300. Therefore, the electronic device 999 can resume the initial working state before the next work.

The delay module 120 includes a sensing unit 121, a power supply unit 122, a delay unit 123, and an output unit 124. The sensing unit 121 generates a delay lock upon receiving the external voltage The signal generates a delayed start signal when the external voltage is not received. The power supply unit 122 supplies the second operating voltage to the delay unit 123 and the output unit 124. The delay unit 123 controls the output unit 124 to output the second operating voltage when receiving the delay lock signal and the second operating voltage. The delay unit 123 initiates a delay operation upon receiving the delayed start signal and the second operating voltage. The delay operation is specifically: continuing to control the output unit 124 to output the second operating voltage during the predetermined period of time, and then controlling the output unit 124 to stop outputting the second operating voltage.

FIG. 2 is a diagram showing a specific circuit configuration of the power supply device 100. The sensing unit 121 includes a first transistor Q1, a first capacitor C1, and a first resistor R1. One end of the first capacitor C1 is connected to the external power source 400 through the first resistor R1, and the other end is grounded. The base of the first transistor Q1 is connected to one end of the first capacitor C1 connected to the first resistor R1, the emitter is grounded, and the collector is connected to the delay unit 123. Among them, the first transistor Q1 is of the NPN type.

The delay unit 123 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a second capacitor C2, a second transistor Q2, and a diode D. One end of the second capacitor C2 is connected to the collector of the first transistor Q1 through the second resistor R2, and the other end thereof is grounded. The emitter of the second transistor Q2 is connected to the power supply unit 122, and the emitter is also connected to one end of the second resistor R2 via the third resistor R3 and the second capacitor C2. The base of the second transistor Q2 is connected to the anode of the diode D through the fourth resistor R4, and the cathode of the diode D is connected to one end of the second capacitor C2 connected to the second resistor R2. The collector of the second transistor Q2 is coupled to the output unit 124. The second transistor Q2 is of the PNP type.

The output unit 124 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third transistor Q3, a coupler U, a first output terminal 20, and a zero equipotential terminal 30. The coupler U includes a light emitting element U11 and a light sensitive element U12. One end of the light-emitting element U11 is connected to the collector of the second transistor Q2 via the fifth resistor R5, and the other end is grounded. Photosensitive element One end of U12 is connected to the base of the third transistor Q3 through the sixth resistor R6, and the other end is connected to the zero equipotential point 126. One end of the seventh resistor R7 is connected to the base of the third transistor Q3, and the other end is connected to the emitter of the third transistor Q3. The emitter of the third transistor Q3 is connected to the power supply unit 122, and the collector is connected to the output terminal 125. The third transistor Q3 is of the PNP type.

When the power supply circuit 100 receives the external voltage, the first transistor Q1 is turned on by the external voltage. The second operating voltage provided by the power supply unit 122 is divided by the second resistor R2 and the third resistor R3. The values of the second resistor R2 and the third resistor R3 are set such that the voltage at the connection point between them is insufficient to reversely puncture the diode D. Therefore, the base of the second transistor Q2 remains at a low potential, thereby turning on the collector and the emitter, and directing the second operating voltage to the output unit 124. The fifth resistor R5 of the output unit 124 receives the second operating voltage transmitted through the second transistor Q2, and causes the light-emitting element U11 connected to the fifth resistor R5 to conduct light, thereby turning on the photosensitive element U12. The values of the sixth resistor R6 and the seventh resistor R7 are set such that the base of the third transistor Q3 is at a low level when the photosensitive element U12 is turned on, so that the third transistor Q3 is turned on. The third transistor Q3 outputs a second operating voltage supplied from the power supply unit 122 received by the emitter through an output terminal 125 connected to the collector.

When the external power source 400 stops outputting the external voltage to the power supply circuit 100, the power conversion module 110 stops operating, and the first transistor Q1 in the power supply device 100 is turned off. At this time, under the action of the second operating voltage, the voltage of the second capacitor C2 (ie, the voltage at the junction between the second resistor R2 and the third resistor R3) starts to rise. After the predetermined period of time, the voltage of the second capacitor C2 reversely breaks through the diode D, so that the base voltage of the second transistor Q2 is at a high potential. The second transistor Q2 is turned off, causing the coupler U to stop working, thereby turning off the third transistor Q3. The output terminal 125 stops outputting the second operating voltage.

As described above, when the reception of the external voltage is stopped, the power supply device 100 does not immediately stop outputting the second operating voltage, but delays the output by the predetermined period of time. Therefore, the control module 200 continues to operate during the predetermined period of time, so that the amount of power in the filter capacitor or other storage element in the power conversion module 110 is depleted by the load 300. In addition, the length of the predetermined period of time may be adjusted by setting electronic components such as a second capacitor C2, a diode D, a second resistor R2, and a third resistor R3 with different parameters.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above is only a preferred embodiment of the present invention, and those skilled in the art will be able to include equivalent modifications or variations in the spirit of the present invention.

100‧‧‧Power supply unit

120‧‧‧Delay module

122‧‧‧Power supply unit

124‧‧‧Output unit

300‧‧‧load

999‧‧‧Electronic equipment

110‧‧‧Power Conversion Module

121‧‧‧Sensor unit

123‧‧‧Delay unit

200‧‧‧Control Module

400‧‧‧External power supply

Claims (9)

A power supply device for receiving an external voltage to provide a first working voltage to a load and a second working voltage to a control module, the control module receiving a second working voltage to provide a control signal to the load, and the load is in the first work The power supply device includes a power conversion module for converting an external voltage to a first operating voltage, and the improvement is that the power supply device further includes a delay module, and the delay module is externally received. The voltage provides a second operating voltage to the control module, continues to provide the second operating voltage to the control module for a predetermined period of time when the receiving of the external voltage is stopped, and stops providing the second operating voltage to the control module after a predetermined period of time. The power supply device of claim 1, wherein the delay module comprises a capacitor, the capacitor is grounded at one end, the delay voltage of the other end is outputted by the delay module, and the delay module is located at a high potential. The output of the second operating voltage is stopped, and the delay module is charged to a high potential by a low potential for a predetermined period of time when the external voltage is stopped. The power supply device of claim 1, wherein the delay module comprises a sensing unit, a power supply unit, a delay unit, and an output unit, and the sensing unit is configured to generate a delay lock signal when receiving an external voltage, and receive the A delay start signal is generated when the external voltage is generated, and the power supply unit supplies a second working voltage to the delay module and the output unit, and the delay unit is configured to control the output unit to output the second working voltage when receiving the delay lock signal and the second working voltage And controlling the output unit to output the second working voltage for a predetermined period of time when receiving the delayed start signal and the second working voltage, and controlling the output unit to stop outputting the second working voltage after the predetermined period of time. The power supply device of claim 3, wherein the delay unit comprises a first resistor, a second resistor, a third resistor, a PNP transistor, a diode, and a capacitor, wherein the first resistor and the second resistor are connected in series Between the unit and the sensing unit, the emitter of the PNP transistor is connected to the first resistor Between the power supply unit and the power supply unit, the collector is connected to the output unit, and the base is connected to the anode of the diode through a third resistor. The cathode of the diode and one end of the capacitor are connected between the first resistor and the second resistor. The other end of the capacitor is grounded. The power supply device of claim 3, wherein the sensing unit comprises an NPN transistor, a capacitor and a resistor, one end of the capacitor is connected to the external power source through a resistor, and the other end is grounded, and the base of the NPN transistor is connected to the capacitor and the resistor One end of the connection, the emitter is grounded, and the collector is connected to the delay unit. The power supply device of claim 3, wherein the output unit comprises a first resistor, a second resistor, a third resistor, a PNP transistor, a coupler, an output terminal, and a zero equipotential terminal, the coupler including the light emitting component And a photosensitive element, one end of the light-emitting element is connected to the delay unit through a first resistor, and the other end is grounded, one end of the photosensitive element is connected to the base of the PNP transistor through a second resistor, and the other end is connected to a zero equipotential point, and the third resistor is connected One end is connected to the base of the PNP transistor, and the other end is connected to the emitter of the PNP transistor. The emitter of the PNP transistor is connected to the power supply unit, and the collector is connected to the output end. An electronic device includes a power supply device, a control module, and a load, the power supply device configured to receive an external voltage to provide a first operating voltage to the load and a second operating voltage to the control module, the control module receiving the second The working voltage is to provide a control signal to the load, and the load operates under the action of the first working voltage and the control signal. The power supply device includes a power conversion module for converting the external voltage to the first working voltage, and the improvement is: the power supply The device further includes a delay module that provides a second operating voltage to the control module when receiving the external voltage, and continues to provide the second operating voltage to the control module for a predetermined period of time when the receiving of the external voltage is stopped, and The supply of the second operating voltage to the control module is stopped after a predetermined period of time. The electronic device of claim 7, wherein the delay module comprises a sensing unit, a power supply unit, a delay unit and an output unit, and the sensing unit is configured to generate a delay lock signal when receiving an external voltage, and receive the A delayed start signal is generated when an external voltage is applied, the power supply The unit provides a second working voltage to the delay module and the output unit, and the delay unit is configured to control the output unit to output the second working voltage when receiving the delay lock signal and the second working voltage, and receive the delayed start signal and the second The operating voltage continues to control the output unit to output the second operating voltage for a predetermined period of time, and the control output unit stops outputting the second operating voltage after the predetermined period of time. The electronic device of claim 8, wherein the delay module comprises a first resistor, a second resistor, a third resistor, a PNP transistor, a diode, and a capacitor, wherein the first resistor and the second resistor are connected in series Between the power supply unit and the sensing unit, the emitter of the PNP transistor is connected between the first resistor and the power supply unit, the collector is connected to the output unit, and the base is connected to the anode of the diode through the third resistor. The negative electrode of the body and one end of the capacitor are connected between the first resistor and the second resistor, and the other end of the capacitor is grounded.