Power supply control circuit, mainboard, equipment and method

Abstract

The invention relates to a power supply control circuit, a mainboard, equipment and a method, the power supply control circuit comprises a switching power supply module and a driving circuit module, a mainboard control unit in the switching power supply module outputs a capacitor on-off control signal to a control end of the driving circuit module according to a detected starting signal, and the capacitor on-off control signal outputs a capacitor on-off control signal to a control end of the driving circuit module; the driving circuit module enters a conducting state under the condition that the capacitor on-off control signal is the first control signal, so that the Y capacitor of the secondary side of the transformer T enters a working connection state, and the problem of control failure caused by the fact that the Y capacitor between the primary side and the secondary side of the transformer is removed from the switching power supply in the prior art is solved; and under the condition that the capacitor on-off control signal is the second control signal, the driving circuit module is controlled to enter the off state, so that the Y capacitor of the secondary side of the transformer enters the off state to cut off the starting interference path, and the problem of communication interference caused by the adoption of a switching power supply in the prior art is further solved.

Description

Technical Field

[0001] The present application relates to the field of circuit technology, and in particular to a power control circuit, a mainboard, a device and a method. Background Art

[0002] With the rapid development of network technology, network communication equipment is more and more widely used in real life. There are more and more three-network-in-one products in daily life. The demand for replacing the original industrial frequency linear power supply with a switching power supply is increasing. With the promotion of global energy-saving and environmental protection standards, more and more electrical equipment uses switching power supplies as power supply. For example, electronically controlled refrigerators usually use switching power supplies for power supply.

[0003] In the specific implementation, the mainboard of the electric control refrigerator usually integrates the main control and frequency conversion on the same board, and uses a power transformer for power supply. The advantage of this integrated mainboard solution is to reduce costs, but because the power supply of the frequency conversion part and the power supply of the main control part are the same transformer; when the compressor is started, the interference generated by the compressor drive circuit is coupled to the weak power supply circuit of the main control part through the Y capacitors of the primary and secondary sides of the transformer. For example, when the refrigerator is powered on for the first time, the interference generated when the compressor starts is coupled to the 5V power supply circuit of the main control part through the Y capacitor of the transformer, which causes interference spikes on the waveform of the refrigerator communication circuit, which may cause communication errors. Summary of the invention

[0004] The present application provides a power control circuit, a mainboard, a device and a method to solve the communication interference problem caused by the use of a switching power supply in the existing related technology.

[0005] In a first aspect, an embodiment of the present application provides a power control circuit, comprising: a switching power module and a driving circuit module; wherein the switching power module comprises a transformer and a mainboard control unit;

[0006] The first end of the primary side of the transformer is electrically connected to the power input end of the switching power supply module, the second end of the primary side of the transformer is electrically connected to the first end of the mainboard control unit, and the second end of the mainboard control unit is electrically connected to the control end of the driving circuit module;

[0007] The mainboard control unit is used to output a capacitor on-off control signal to the control end of the driving circuit module according to the detected start signal; the capacitor on-off control signal is divided into a first control signal and a second control signal, the first control signal is used to control the driving circuit module to enter an on state, and the second control signal is used to control the driving circuit module to enter an off state;

[0008] When the driving circuit module enters the on-state, the Y capacitor of the secondary side of the transformer enters a working connection state through the driving circuit module in the on-state.

[0009] Optionally, the driving circuit module includes a relay, a control end of the relay is electrically connected to the control end of the driving circuit module, a first end of the relay is electrically connected to the second end of the Y capacitor, the second end of the relay is electrically connected to the first end of the secondary side of the converter, and the first end of the Y capacitor is electrically connected to the first end of the primary side of the transformer; when the relay is energized, the driving circuit module enters the on state; when the relay is disconnected, the driving circuit module enters the off state.

[0010] Optionally, the drive circuit module includes a relay, a control end of the relay is electrically connected to the control end of the drive circuit module, a first end of the relay is electrically connected to the first end of the primary side of the transformer, a second end of the relay is electrically connected to the first end of the Y capacitor, and a second end of the Y capacitor is electrically connected to the first end of the secondary side of the converter; when the relay is energized, the drive circuit module enters the on state; when the relay is disconnected, the drive circuit module enters the off state.

[0011] Optionally, the driving circuit module also includes: a first transistor, a first diode and a first capacitor; the control end of the relay includes a first end of the coil of the relay and a second end of the coil of the relay, the first end of the coil, the first end of the first capacitor, the cathode of the first diode and the second end of the secondary side of the transformer are electrically connected, the second end of the coil, the second end of the first capacitor, the anode of the first diode and the first end of the first transistor are electrically connected, the control end of the first transistor is electrically connected to the control end of the driving circuit module, and the second end of the first transistor is electrically connected to the reference ground of the power control circuit.

[0012] Optionally, the mainboard control unit includes: a switching power supply controller and a detection feedback circuit; the detection input end of the detection feedback circuit is electrically connected to the second end of the secondary side of the transformer, the output end of the detection feedback circuit is electrically connected to the first end of the switching power supply controller, and the second end of the switching power supply controller is electrically connected to the control end of the driving circuit module; the detection feedback circuit is used to detect the current signal;

[0013] The switching power supply controller is used to: determine the start signal based on the current signal, and output the second control signal when the start duration corresponding to the start signal is less than a preset duration threshold, and output the first control signal when the start duration is not less than the preset duration threshold.

[0014] Optionally, the detection feedback circuit includes: a first resistor and an optocoupler device, the input end of the optocoupler device is electrically connected to the second end of the secondary side of the transformer, and the output end of the optocoupler device is electrically connected to the first end of the switching power supply controller through the first resistor.

[0015] Optionally, the switching power supply module further includes an output rectifier circuit of the transformer;

[0016] The input end of the output rectifier circuit is electrically connected to the second end of the secondary side of the transformer, and the output end of the output rectifier current, the driving power supply end of the driving circuit module and the detection input end of the mainboard control unit are electrically connected.

[0017] Optionally, the output rectifier circuit includes: a second diode, a second resistor and a second capacitor; the anode of the second diode, the first end of the second capacitor and the second end of the secondary side of the transformer are electrically connected, the second end of the second capacitor is electrically connected to the first end of the second resistor, the cathode of the second diode, the second end of the second resistor, the output end of the output rectifier current, the driving power supply end of the driving circuit module and the detection input end of the mainboard control unit are electrically connected; or,

[0018] The anode of the second diode, the first end of the second resistor and the second end of the secondary side of the transformer are electrically connected, the second end of the second resistor is electrically connected to the first end of the second capacitor, the cathode of the second diode, the second end of the second capacitor, the output end of the output rectified current, the driving power supply end of the driving circuit module and the detection input end of the mainboard control unit are electrically connected.

[0019] Optionally, the switching power supply module also includes: an auxiliary winding circuit of the transformer, the input end of the auxiliary winding circuit is electrically connected to the second end of the primary side of the transformer, the output end of the auxiliary winding circuit is electrically connected to the first end of the mainboard control unit, and the output end of the auxiliary winding circuit is used to output a power supply signal, and the power supply signal is used to power the mainboard control unit.

[0020] Optionally, the power control circuit also includes: a communication circuit module, the transmitting end of the communication circuit module is electrically connected to the third end of the mainboard control unit, and the mainboard control unit is also used to: when the transmitting end stops transmitting, output a third control signal to the transmitting end, and the third control signal is used to control the transmitting end of the communication circuit module to enter a stop and suspend state.

[0021] Optionally, the output end of the communication circuit module includes at least two connectors connected in parallel, and the at least two parallel connectors include a first connector and a second connector, the first connector is used to connect to a device display panel, and the second connector is used to connect to a test device.

[0022] Optionally, the communication circuit module includes a second transistor and a third capacitor, the control end of the second transistor is electrically connected to the third end of the mainboard control unit, the first end of the second transistor, the power end of the communication circuit module and the power end of the connector are electrically connected, the second end of the second transistor, the first end of the third capacitor and the first transmission end of the connector are electrically connected, and the second end of the third capacitor is electrically connected to the reference ground of the power control circuit.

[0023] In a second aspect, an embodiment of the present application provides a mainboard, comprising a power control circuit as described in any one of the first aspect of the present application.

[0024] In a third aspect, an embodiment of the present application provides an electrical device comprising a power control circuit as described in the first aspect of the present application.

[0025] In a fourth aspect, an embodiment of the present application provides a power supply control method, which is applied to the power supply control circuit described in any one of the first aspects of the present application, and the power supply control method includes: detecting a start signal; outputting a capacitor on-off control signal based on the start signal; the capacitor on-off control signal is divided into a first control signal and a second control signal, the first control signal is used to control the drive circuit module to enter an on state, and the second control signal is used to control the drive circuit module to enter an off state; when the drive circuit module enters the on state, the Y capacitor on the secondary side of the converter is controlled to enter a connected working state through the drive circuit module in the on state.

[0026] Optionally, the output capacitor on-off control signal is based on the start signal, including: determining the start duration based on the start signal; if the start duration is less than a preset duration threshold, outputting the second control signal; if the start duration is not less than the preset duration threshold, outputting the first control signal.

[0027] Optionally, the power control method further includes: when the transmitting end of the communication circuit module stops transmitting, outputting a third control signal to the transmitting end; and controlling the transmitting end to enter a stop suspension state through the third control signal.

[0028] In summary, the power control circuit, mainboard, device and method provided in the embodiments of the present application output a capacitor on-off control signal to the control end of the drive circuit module based on the detected start signal, so that the drive circuit module enters the on state when the capacitor on-off control signal is the first control signal, so that the Y capacitor on the secondary side of the transformer T can enter the working connection state through the drive circuit module in the on state, thereby solving the control failure problem caused by the switching power supply removing the Y capacitor between the primary and secondary sides of the transformer in the existing related technology; and when the capacitor on-off control signal is the second control signal, the drive circuit module is controlled to enter the off state, so that the Y capacitor on the secondary side of the transformer enters the non-working connection state, that is, the Y capacitor on the secondary side of the transformer enters the off state, isolating the startup interference path, and the startup interference generated by this part of the circuit on the primary side of the transformer cannot be coupled to the secondary side of the transformer through the Y capacitor, thereby solving the communication interference problem caused by the use of the switching power supply in the existing related technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0031] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0032] Figure 1 A structural block diagram of a power control circuit provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of a power control circuit provided as an example of the present application;

[0034] Figure 3 A schematic diagram of a power control circuit provided as another example of the present application;

[0035] Figure 4 A schematic diagram of a circuit principle of a power control circuit provided in an optional embodiment of the present application;

[0036] Figure 5 A schematic diagram of a circuit principle of a power control circuit provided in another optional embodiment of the present application;

[0037] Figure 6 A schematic diagram of a circuit structure of a communication circuit module provided in an embodiment of the present application;

[0038] Figure 7 A schematic diagram of the structure of a mainboard provided in an embodiment of the present application;

[0039] Figure 8 A schematic diagram of the structure of an electrical device provided in an embodiment of the present application;

[0040] Fig. 9 A flowchart of the steps of a power control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0042] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0043] In the existing related technology, in order to cut off the interference path of the compressor drive circuit, when a switching power supply is used as the power supply, the Y capacitor between the primary and secondary sides of the transformer is usually removed; however, removing the Y capacitor brings risks such as display panel resetting and touch chip malfunction.

[0044] Based on the above, the embodiments of the present application provide a power control circuit, a mainboard, a device and a method, which realizes a method of reducing communication interference through a reliable power control circuit that reduces communication interference, thereby solving the problem of interference to the communication waveform caused by the Y capacitor between the primary and secondary sides of the transformer when the switching power supply is started in the existing related technology, and solves the problem of the reset display panel button not working properly due to the switching power supply having no Y capacitor.

[0045] Figure 1 This is a structural block diagram of a power control circuit provided in an embodiment of the present application. In a specific implementation, the power control circuit provided in an embodiment of the present application can be used as a control circuit of a switching power supply, and can specifically include: a switching power supply module 110 and a drive circuit module 120; wherein the switching power supply module 110 includes a transformer T and a mainboard control unit 111; Figure 1 As shown, the first end of the primary side of the transformer T is electrically connected to the power input terminal P of the switching power supply module 110, the second end of the primary side of the transformer T is electrically connected to the first end of the mainboard control unit 111, and the second end of the mainboard control unit 111 is electrically connected to the control end of the drive circuit module 120, so that the mainboard control unit 111 can output a capacitor on-off control signal HS to the control end of the drive circuit module 120 based on the detected start signal JR, so as to control the on-off of the drive circuit module 120 through the capacitor on-off control signal HS, and then the on-off of the Y capacitor of the secondary side of the transformer T can be controlled through the drive circuit module 120.

[0046] Specifically, the mainboard control unit 111 in the embodiment of the present application is used to output a capacitor on-off control signal HS to the control end of the driving circuit module 120 according to the detected start signal JR; the capacitor on-off control signal HS can be divided into a first control signal and a second control signal, the first control signal is used to control the driving circuit module 120 to enter the on state, and the second control signal is used to control the driving circuit module 120 to enter the off state. Specifically, when the driving circuit module 120 enters the on state, the Y capacitor of the secondary side of the transformer T is electrically connected to the primary side of the transformer T through the driving circuit module 120 in the on state, so that the Y capacitor enters the connection working state, and the connection working state is the on state in which the Y capacitor is electrically connected to the primary side of the transformer T. When the driving circuit module 120 enters the disconnected state, the Y capacitor on the secondary side of the transformer enters a non-working connection state, which means that the Y capacitor on the secondary side of the transformer T is in a circuit disconnected state, that is, the Y capacitor on the secondary side of the transformer enters a disconnected state. Therefore, the startup interference generated by this part of the circuit on the primary side of the transformer T cannot be transmitted to the secondary side of the transformer T through the Y capacitor, that is, the startup interference generated by this part of the circuit on the primary side of the transformer T cannot be coupled to the secondary side of the transformer T through the Y capacitor, thereby solving the communication interference problem caused by the use of a switching power supply in the existing related technology.

[0047] It can be seen that the power control circuit provided in the embodiment of the present application outputs a capacitor on-off control signal HS to the control end of the driving circuit module 120 according to the detected start signal JR through the mainboard control unit 111 in the switching power supply module 110, so that the driving circuit module 120 enters the on state when the capacitor on-off control signal HS is the first control signal, so that the Y capacitor on the secondary side of the transformer T can enter the working connection state through the driving circuit module 120 in the on state, thereby solving the problems such as reset failure and display button failure caused by the removal of the Y capacitor between the primary and secondary sides of the transformer T by the switching power supply in the prior art; and the driving circuit module 120 enters the off state when the capacitor on-off control signal HS is the second control signal, so that the Y capacitor on the secondary side of the transformer T enters the off state, cuts off the startup interference path, and the startup interference generated by this part of the circuit on the primary side of the transformer T cannot be coupled to the secondary side of the transformer T through the Y capacitor, thereby solving the communication interference problem caused by the use of the switching power supply in the prior art.

[0048] In some optional embodiments of the present application, the first end of the driving circuit module 120 can be electrically connected to the second end of the Y capacitor, the second end of the driving circuit module 120 can be electrically connected to the first end of the secondary side of the transformer T, and the first end of the Y capacitor can be electrically connected to the first end of the primary side of the transformer T, so that the Y capacitor can enter the working connection state through the driving circuit module 120 in the on state, and then the primary side signal of the transformer T can be coupled to the secondary side of the transformer T through the Y capacitor in the working connection state; wherein the primary side signal of the transformer T can refer to various signals transmitted through the primary side of the transformer T, such as can include but not limited to a reset signal, a display panel key signal, etc., the embodiment of the present application does not limit this.

[0049] For example, the driving circuit module 120 may use the relay K1 to control the on / off of the Y capacitor in the switching power supply module 110. Specifically, when the driving circuit module 120 includes the relay K1, Figure 2 As shown, the control end of the relay K1 is electrically connected to the control end of the drive circuit module 120, the first end of the relay K1 is electrically connected to the second end of the Y capacitor, the second end of the relay K1 is electrically connected to the first end of the secondary side of the transformer T, and the first end of the Y capacitor is electrically connected to the first end of the primary side of the transformer T, so that the drive circuit module 120 can control whether the relay K1 is attracted or not through the capacitor on-off control signal HS output by the board control unit, and then the state of the drive circuit module 120 can be controlled by the relay K1. Specifically, when the relay K1 is attracted, the drive circuit module 120 enters the on state, so that the Y capacitor of the secondary side of the transformer T can be controlled to enter the working connection state through the drive circuit module 120 in the on state; and when the relay K1 is disconnected, the drive circuit module 120 enters the disconnect state, and then the connection between the second end of the Y capacitor and the secondary side of the transformer T can be disconnected, so that the Y capacitor is in the disconnected state.

[0050] In some other optional embodiments of the present application, the first end of the driving circuit module 120 can be electrically connected to the first end of the primary side of the transformer T, the second end of the driving circuit module 120 can be electrically connected to the first end of the Y capacitor, and the second end of the Y capacitor can be electrically connected to the first end of the secondary side of the transformer T, so that the Y capacitor can enter the working connection state through the driving circuit module 120 in the on state, and then the primary side signal of the transformer T can be coupled to the secondary side of the transformer T through the Y capacitor in the working connection state; wherein the primary side signal of the transformer T can refer to various signals transmitted through the primary side of the transformer T, such as can include but not limited to a reset signal, a display panel key signal, etc., and the embodiments of the present application are not limited to this.

[0051] For example, Figure 3 As shown, in the case where the driving circuit module 120 includes a relay K1, the control end of the relay K1 is electrically connected to the control end of the driving circuit module 120, the first end of the relay K1 is electrically connected to the first end of the primary side of the transformer T, the second end of the relay K1 is electrically connected to the first end of the Y capacitor, and the second end of the Y capacitor is electrically connected to the first end of the secondary side of the transformer T, so that the driving circuit module 120 can control the relay K1 through the capacitor on-off control signal HS output by the board control unit, thereby making the driving circuit module 120 enter the on-state when the relay K1 is energized, and enter the off-state when the relay K1 is disconnected.

[0052] Of course, the driving circuit module 120 in the embodiment of the present application may include other circuit components in addition to the relay K1, such as: a first transistor Q1, a first diode D1, a first capacitor C1, etc., and the embodiment of the present application does not limit this.

[0053] In an optional embodiment of the present application, if Figure 4 As shown, the driving circuit module 120 may also include: a first transistor Q1, a first diode D1 and a first capacitor C1; the control end of the relay K1 includes a first end of the coil of the relay K1 and a second end of the coil of the relay K1, the first end of the coil, the first end of the first capacitor C1, the cathode of the first diode D1 and the driving power supply end of the driving circuit module 120 are electrically connected, the second end of the coil, the second end of the first capacitor C1, the anode of the first diode D1 and the first end of the first transistor Q1 are electrically connected, the control end of the first transistor Q1 is electrically connected to the control end of the driving circuit module 120, and the second end of the first transistor Q1 is electrically connected to the reference ground GND of the power control circuit, so that the relay K1 can be controlled by the first crystal to select the relay K1 to control the on and off of the Y capacitor in the switching power supply module 110.

[0054] The driving power supply terminal of the driving circuit module 120 may be electrically connected to the second terminal of the secondary side of the transformer T, so that the power supply voltage outputted by the second terminal of the secondary side of the transformer T is used to power the driving circuit module 120 . For example, in the case where the driving circuit module 120 includes: a relay K1, a first transistor Q1, a first diode D1 and a first capacitor C1, the control end of the relay K1 may include a first end of the coil of the relay K1 and a second end of the coil of the relay K1, the first end of the coil, the first end of the first capacitor C1, the cathode of the first diode D1 and the second end of the secondary side of the transformer T are electrically connected, the second end of the coil, the second end of the first capacitor C1, the anode of the first diode D1 and the first end of the first transistor Q1 are electrically connected, the control end of the first transistor Q1 is electrically connected to the control end of the driving circuit module 120, and the second end of the first transistor Q1 is electrically connected to the reference ground GND of the power control circuit, so that the driving circuit module 120 can be powered by the power supply voltage output by the second end of the secondary side of the transformer T. For example, in the case where the driving power supply voltage of the driving circuit module 120 is 12V, a 12V voltage can be output through the second end of the secondary side of the transformer T to power the driving circuit module 120.

[0055] In some optional embodiments of the present application, the driving circuit module 120 may further include: a current limiting resistor R32; Figure 4 As shown, the first end of the current limiting resistor R32 is electrically connected to the control end of the driving circuit module, and the second end of the current limiting resistor R32 is electrically connected to the control end of the first transistor Q1, so that the control end of the first transistor Q1 can be electrically connected to the control end of the driving circuit module 120 and the second end of the mainboard control unit 111 through the current limiting resistor R32, so that the capacitor on-off control signal HS output by the mainboard control unit 111 can be transmitted to the first transistor Q1 through the current limiting resistor R32, so as to control the relay K1 through the first transistor Q1. Among them, the first transistor Q1 can be selected as a triode, so that the relay K1 is controlled by the triode, and the embodiment of the present application does not make specific restrictions on this.

[0056] The Y capacitor in the switching power module 110 may specifically include one or more capacitors between the primary and secondary sides of the transformer. For example, the Y capacitor in the switching power module 110 may include two capacitors connected in series between the primary and secondary sides of the transformer T. Figure 4 As shown, the forty-seventh capacitor C47 and the sixty-fourth capacitor C64 connected in series between the primary and secondary sides of the transformer T serve as Y capacitors in the switching power supply module 110. The embodiment of the present application does not impose any specific limitation on the number of Y capacitors.

[0057] In some optional embodiments of the present application, the mainboard control unit 111 may include: a switching power supply controller U19 and a detection feedback circuit 112, so as to detect the current signal through the detection feedback circuit 112, and feed back the detected current signal to the switching power supply controller U19, so that the switching power supply controller U19 can determine the start signal JR according to the current signal, and determine the start time corresponding to the start signal JR, so as to output the corresponding capacitor on-off control signal HS to the driving circuit module 120 according to the start time, so that the driving circuit module 120 can control the on-off of the Y capacitor according to the capacitor on-off control signal HS, so as to avoid the interference generated during the start-up from being coupled to the secondary side of the transformer T through the Y capacitor. Wherein, the detection feedback circuit 112 is used to detect the current signal; the switching power supply controller U19 is used to: determine the start signal JR according to the current signal, and output the second control signal when the start time corresponding to the start signal JR is less than the preset time threshold, and output the first control signal when the start time is not less than the preset time threshold.

[0058] For example, the detection input end of the detection feedback circuit 112 is electrically connected to the second end of the secondary side of the transformer T, and the output end of the detection feedback circuit 112 is electrically connected to the first end of the switching power supply controller U19, so that the detection feedback circuit 112 can output the detected current signal to the switching power supply controller U19 through the output end, so that the switching power supply controller U19 can determine the current size according to the current signal, so as to determine that the start signal JR is detected when the current value is greater than the preset start current threshold value, and can record the start duration for the start signal JR as the start duration corresponding to the start signal JR, and then judge whether the start duration is less than the preset duration Threshold, so that when the startup time is less than the preset time threshold, the second control signal is output to the driving circuit module 120, thereby triggering the driving circuit module 120 to enter the disconnected state according to the second control signal, reducing communication interference, and when the startup time is not less than the preset time threshold, the first control signal is output to trigger the driving circuit module 120 to enter the on state according to the first control signal, so that the Y capacitor on the secondary side of the transformer T can enter the working connection state through the driving circuit module 120 in the on state, solving the control failure problem such as reset failure caused by the switching power supply without Y capacitor in the related related technologies, and ensuring the normal operation of the circuit while reducing interference.

[0059] The second end of the switch power controller U19 is electrically connected to the control end of the drive circuit module 120, so that the switch power controller U19 can output the capacitor on / off control signal HS to the control end of the drive circuit module 120 through the second end, so as to control the Y capacitor on / off through the drive circuit module 120. In some optional embodiments of the present application, the detection feedback circuit 112 can collect the switch power current through a resistor, generate a current signal, and transmit it to the switch power controller U19 as a detected current signal, so that the switch power controller U19 can determine the start signal JR based on the current signal, such as when the current value corresponding to the current signal is greater than a preset start current threshold, the current signal is used as the detected start signal. The switch power controller U19 can be a switch power chip, so as to output the first control signal or the second control signal through the switch power chip.

[0060] In some optional embodiments of the present application, the detection feedback circuit 112 includes: a first resistor R1 and an optocoupler device U18, the input end of the optocoupler device U18 is electrically connected to the second end of the secondary side of the transformer T, and the output end of the optocoupler device U18 is electrically connected to the first end of the switching power supply controller U19 through the first resistor R1, so that the detection and feedback of the current signal can be realized through the first resistor R1 and the optocoupler device U18. Among them, the first resistor R1 serves as a collection resistor for the switching power supply current, and the detection feedback circuit 112 can specifically include one or more collection resistors, and the embodiments of the present application do not impose specific restrictions on this. For example, when the detection feedback circuit 112 includes two collection resistors, the two collection resistors can be connected in parallel, such as Figure 5 As shown, the first resistor R1 and the second collection resistor R126 are connected in parallel to serve as the collection resistor in the detection feedback circuit 112 .

[0061] Of course, the detection feedback circuit 112 in the embodiment of the present application may include other circuit components in addition to the first resistor R1 and the optical coupler device U18, such as Figure 4 , Figure 5 The feedback device U20, the seventeenth resistor R17, the eighteenth resistor R18, the nineteenth resistor R19, the sixteenth resistor R16, the fifteenth resistor R15, the thirty-eighth capacitor C38, the seventy-seventh capacitor C77, etc. shown in the embodiment of the present application are not specifically limited to this.

[0062] In some optional embodiments of the present application, in addition to the transformer T and the mainboard control unit 111, the switching power supply module 110 may also include other circuit devices, such as an output rectifier circuit device of the transformer T, so as to form an output rectifier circuit 113 of the transformer through the output rectifier circuit device. The embodiments of the present application do not impose specific restrictions on this.

[0063] Optional, such as Figure 4 or Figure 5 As shown, the switching circuit in the embodiment of the present application also includes an output rectifier circuit 113 of the transformer T; the input end of the output rectifier circuit 113 is electrically connected to the second end of the secondary side of the transformer T, and the output end of the output rectifier circuit 113, the driving power supply end of the driving circuit module 120 and the detection input end of the mainboard control unit 111 are electrically connected, so that a DC voltage can be output through the output rectifier circuit 113 to power the driving power supply end of the driving circuit module 120 through the DC voltage, and the DC voltage can be detected by the mainboard control unit 111 to generate a corresponding current signal, so as to determine the start signal JR and the start time corresponding to the start signal JR according to the current signal, and then the corresponding capacitor on-off control signal HS can be output to the driving circuit module 120 according to the start time, so as to control the Y capacitor on and off through the driving circuit module 120.

[0064] In some optional embodiments of the present application, the output rectifier circuit 113 of the transformer T may include: a second diode D2, a second resistor R2 and a second capacitor C2, so that the output rectifier circuit 113 of the transformer T is formed by the second diode D2, the second resistor R2 and the second capacitor C2 to achieve rectified output. Figure 5 As shown, the anode of the second diode D2, the first end of the second capacitor C2 and the second end of the secondary side of the transformer T are electrically connected, the second end of the second capacitor C2 is electrically connected to the first end of the second resistor R2, the cathode of the second diode D2, the second end of the second resistor R2, the output end of the output rectifier circuit 113, the driving power supply end of the driving circuit module 120 and the detection input end of the mainboard control unit 111 are electrically connected, so that the output rectifier circuit 113 of the transformer T can be composed of the second diode D2, the second resistor R2 and the second capacitor C2, and the 12V voltage is output as the power supply for the weak current circuit, and the 12V voltage can be converted by DCDC to 5V voltage as the driving power supply, which is provided to the driving power supply end of the driving circuit module 120 to power the driving circuit module 120.

[0065] Of course, in the embodiment of the present application, the positions of the second capacitor C2 and the second resistor R2 connected in series can be interchanged, such as the anode of the second diode D2, the first end of the second resistor R2 and the second end of the secondary side of the transformer T are electrically connected, the second end of the second resistor R2 is electrically connected to the first end of the second capacitor C2, the cathode of the second diode D2, the second end of the second capacitor C2, the output end of the output rectifier circuit 113, the driving power supply end of the driving circuit module 120 and the detection input end of the mainboard control unit 111 are electrically connected, and the embodiment of the present application does not impose specific restrictions on this.

[0066] Optionally, the switching power supply module 110 in the embodiment of the present application further includes: an auxiliary winding circuit 114 of the transformer T, so as to output a power supply signal through the auxiliary winding circuit 114 for power supply. For example, the input end of the auxiliary winding circuit 114 is electrically connected to the second end of the primary side of the transformer T, and the output end of the auxiliary winding circuit 114 is electrically connected to the first end of the mainboard control unit 111, so that the auxiliary winding circuit 114 can output a power supply signal to the mainboard control unit 111 through the output end to power the mainboard control unit 111. Among them, the output end of the auxiliary winding circuit 114 is used to output a power supply signal, and the power supply signal can be specifically used to power the mainboard control unit 111.

[0067] As an example of this application, Figure 5 As shown, the auxiliary winding circuit 114 can be composed of a third diode D3, a fourth capacitor C4 and a fourth resistor R4, so that the auxiliary winding circuit 114 can output a +18V voltage signal as a power supply signal to supply the mainboard control unit 111 and the variable frequency drive circuit to power the mainboard control unit 111 and the variable frequency drive circuit. Among them, the mainboard control unit 111 can include a switching power supply controller U19 set on the mainboard, and the +18V voltage signal output by the auxiliary winding circuit 114 can be transmitted to the switching power supply controller U19 through the sixth diode D6 and the fifty-fourth resistor R54 to power the switching power supply controller U19, so as to ensure that the switching power supply controller U19 can work normally.

[0068] Optionally, the switching power module 110 in the embodiment of the present application may further include a clamping circuit 115, the first end of the clamping circuit 115 may be electrically connected to the primary first end of the transformer T and the power input end P of the switching power module 110, and the second end of the clamping circuit 115 may be electrically connected to the primary third end of the transformer T and the switching power controller U19. The clamping circuit 115 may be implemented using resistors, capacitors, and diodes, such as four resistors, one capacitor, and one diode to form the clamping circuit 115, such as Figure 5 As shown, it can be Figure 5 The tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the tenth diode D10 and the tenth capacitor C10 in the switching power module 110 constitute a clamping circuit 115. The embodiment of the present application does not specifically limit the specific circuit structure of the clamping circuit 115. The power input terminal P of the switching power module 110 can be used to output the DC voltage output by the AC power supply through the filter circuit and the rectifier circuit. For example, the power input terminal P can be used to output the 310V DC voltage 310VDC output by the 220V AC power supply 220VAC through the filter circuit and the rectifier circuit. The embodiment of the present application does not limit this.

[0069] In a specific implementation, the power control circuit provided in the embodiment of the present application may include not only a switching power supply module 110 and a driving circuit module 120, but also other circuit modules, such as a communication circuit module 130, etc. The embodiment of the present application does not impose any specific restrictions on this.

[0070] Optionally, based on the above embodiment, the power control circuit provided in the embodiment of the present application further includes a communication circuit module 130, so that the mainboard control unit 111 can transmit signals through the communication circuit module 130, such as sending signals through the transmitting end TX of the communication circuit module 130, such as Figure 6 As shown, the signal can be received by the transmitting end TX of the communication circuit module 130 to realize communication transmission.

[0071] In an optional embodiment of the present application, the transmitter TX of the communication circuit module 130 is electrically connected to the third end of the mainboard control unit 111, so that the mainboard control unit 111 can output a third control signal to the transmitter TX of the communication circuit module 130, so as to control the transmitter TX to enter a stop suspension state when the transmitter TX of the communication circuit module 130 stops transmitting through the third control signal, that is, the transmitter TX of the communication circuit stops and suspends, so as to resist interference from external input. It can be seen that the mainboard control unit 111 in the embodiment of the present application can also be used to: when the transmitter TX stops transmitting, output a third control signal to the transmitter TX, and the third control signal is used to control the transmitter TX of the communication circuit module 130 to enter a stop suspension state.

[0072] In some optional embodiments of the present application, the output end of the communication circuit module 130 includes at least two connectors connected in parallel, so that the same mainboard control unit 111 can communicate with devices connected to multiple connectors through the communication circuit module 130, thereby realizing a one-to-many communication circuit. The devices connected to the connectors may include but are not limited to device display panels, test equipment, etc., and the present application does not impose any restrictions on this.

[0073] Optionally, at least two parallel connectors in the embodiment of the present application include a first connector J1 and a second connector J2, wherein the first connector J1 is used to connect to a device display panel, and the second connector J2 is used to connect to a test device. The device display panel refers to a display panel of a device, such as a display panel of a frequency conversion device such as an air conditioner or a refrigerator, which is not limited in the embodiment of the present application; the test device may include a test tooling that needs to be tested, which is not limited in the embodiment of the present application.

[0074] In some optional embodiments of the present application, the communication circuit module 130 includes a second transistor Q2 and a third capacitor C3, the control end of the second transistor Q2 is electrically connected to the third end of the mainboard control unit 111, the first end of the second transistor Q2, the power end of the communication circuit module 130 and the power end of the connector are electrically connected, the second end of the second transistor Q2, the first end of the third capacitor C3 and the first transmission end of the connector are electrically connected, and the second end of the third capacitor C3 is electrically connected to the reference ground GND of the power control circuit, so that the second transistor Q2 can be controlled to be disconnected when the transmitting end TX stops transmitting, so that the transmitting end TX of the communication circuit module 130 is suspended when the transmission stops, and the transmitting end TX of the communication circuit module 130 is connected to the third capacitor C3, which can resist the interference of external input.

[0075] Of course, the communication circuit module 130 in the embodiment of the present application may include other circuit components besides the second transistor Q2 and the third capacitor C3, such as Figure 6 As shown, the communication circuit module 130 may also include a fourth transistor Q4, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a ninth diode D9, a tenth diode D10, an eleventh diode D11, a twelfth capacitor C12, an eleventh capacitor C11, etc., but the embodiments of the present application are not limited to this.

[0076] In one embodiment of the present application, the transmitting end TX and the receiving end RX of the communication circuit module 130 can be connected to the mainboard MCU, so that the mainboard MCU can communicate with the device connected to the connector through the communication circuit module 130. For example, when the first connector J1 is connected to the refrigerator display board, and the first connector J2 is connected to the test equipment, the mainboard MCU can communicate with the refrigerator display board and the test equipment through the communication circuit module 130. Among them, the communication circuit module 130 can be used as a communication circuit for the mainboard MCU to communicate with the refrigerator display board and the test equipment.

[0077] like Figure 7As shown, the embodiment of the present application provides a mainboard 700, which includes a power control circuit 710. The power control circuit 710 can be the power control circuit described in any of the above embodiments of the present application, so that the mainboard 700 can output a capacitor on-off control signal HS to the control end of the drive circuit module 120 according to the detected start signal JR, so as to control the drive circuit module 120 to enter a conducting state when the capacitor on-off control signal HS is a first control signal, so that the Y capacitor of the secondary side of the transformer T can enter a working connection state through the drive circuit module 120 in the conducting state, and then This solves the problems such as reset failure, display button failure, etc. caused by the removal of the Y capacitor between the primary and secondary sides of the transformer T by the switching power supply in the prior art; and when the capacitor on-off control signal HS is the second control signal, the driving circuit module 120 is controlled to enter the disconnected state, so that the Y capacitor on the secondary side of the transformer T enters the disconnected state, thereby isolating the startup interference path, so that the startup interference generated by this part of the circuit on the primary side of the transformer T cannot be coupled to the secondary side of the transformer T through the Y capacitor, thereby solving the problem of communication interference caused by the use of a switching power supply in the prior art through control of the capacitor on-off control signal HS.

[0078] As an example of the present application, taking the mainboard MCU as the mainboard control unit 111, when the electric-controlled refrigerator is powered on for the first time, the mainboard MCU can output a second control signal to the drive circuit module 120 to control the first transistor Q1 to be non-conductive and the relay K1 to be disconnected. When the switching power supply is working, the compressor can be started based on the power signal provided by the switching power supply to control the Y capacitor of the switching power supply transformer to be turned off by the relay K1; 1 minute after the compressor is started, the mainboard MCU can output a first control signal to the drive circuit module 120 to control the first transistor Q1 to be turned on and the relay K1 to be closed, so as to control the Y capacitor of the switching power supply transformer to be turned on by the relay K1. When the compressor is stopped, the mainboard MCU can control the first transistor Q1 to be turned on by the first control signal, so that the K1 relay K1 is closed.

[0079] It can be seen that the electronically controlled refrigerator in the example of the present application can output a second control signal to the drive circuit module 120 to control the relay K1 to be disconnected to disconnect the Y capacitor when it is powered on for the first time or the compressor is turned on for the first minute, thereby effectively reducing the compressor startup crosstalk and improving the anti-interference degree of the communication circuit; and one minute after the compressor is turned on or when the compressor is stopped, the second control signal can be output to the drive circuit module 120 to control the relay K1 to be closed to connect the Y capacitor, thereby reducing the risk of display panel reset or button malfunction, thereby solving the reset and display panel button malfunction problems of the switch power supply without the Y capacitor.

[0080] In some optional embodiments of the present application, a power cord with a magnetic ring can be used to reduce the EMI high-frequency emission after disconnecting the Y capacitor. Specifically, considering that the spatial radiation is large when the Y capacitor is disconnected, a power cord with a magnetic ring can be used for filtering to reduce the value of the interference power. Specifically, a power cord with a magnetic ring can be used to connect to the filter circuit of the mainboard, and then to the switching power supply module. For example, the power cord with a magnetic ring is at the input end of the refrigerator, followed by a filter circuit and a rectified current to the P end of 310VDC to power the switching power supply module 110.

[0081] In summary, the mainboard provided in the embodiment of the present application can control the relay K1 through the mainboard MCU to turn the connection line of the Y capacitor on and off, so as to disconnect the Y capacitor at the first power-on or the first minute before the compressor is turned on, reduce the compressor startup crosstalk, and improve the anti-interference degree of the communication circuit. The Y capacitor can be connected 1 minute after the compressor is turned on or when the compressor is stopped, thereby reducing the risk of display panel resetting or button malfunction.

[0082] In one embodiment of the present application, the power control circuit provided in the embodiment of the present application can be applied to an electrical device as a power control device of the electrical device, so that the electrical device can output a second control signal to the control end of the drive circuit module 120 through the power control device when it is powered on for the first time, so as to control the drive circuit module 120 to enter a disconnected state, thereby disconnecting the Y capacitor on the secondary side of the transformer T, that is, the Y capacitor on the secondary side of the transformer T enters a disconnected state, and cuts off the startup interference path, thereby solving the problem of communication interference caused by the use of a switching power supply in the prior art; and after the startup time reaches a preset time threshold, a first control signal can be output to the control end of the drive circuit module 120 to control the drive circuit module 120 to enter a conducting state, so that the Y capacitor enters a connected working state, thereby solving the problems such as reset failure, display button failure, etc. caused by the removal of the Y capacitor between the primary and secondary sides of the transformer T by the switching power supply in the prior art.

[0083] like Figure 8As shown, the embodiment of the present application provides an electrical device 800, including a power control circuit 710, which can be the power control circuit described in any of the above embodiments of the present application, so that the electrical device 800 can detect the start signal JR to output the capacitor on-off control signal HS according to the start signal JR, so that the drive circuit module 120 can be controlled to enter the on state when the capacitor on-off control signal HS is a first control signal, so that the Y capacitor on the secondary side of the transformer T can enter the working connection state through the drive circuit module 120 in the on state, thereby solving the problem of control failure caused by the switching power supply removing the Y capacitor between the primary and secondary sides of the transformer T in the prior art; and when the capacitor on-off control signal HS is a second control signal, the drive circuit module 120 is controlled to enter the off state, so that the Y capacitor on the secondary side of the transformer T enters the off state, so as to cut off the startup interference path, so that the startup interference generated by this part of the circuit on the primary side of the transformer T cannot be coupled to the secondary side of the transformer T through the Y capacitor, thereby solving the problem of communication interference caused by the use of the switching power supply in the prior art. Among them, the electrical equipment 800 may include but is not limited to electrical equipment such as air conditioners and refrigerators, and the embodiments of the present application do not limit this.

[0084] like Fig. 9 As shown, an embodiment of the present application provides a schematic flow chart of the steps of a power control method. The power control method provided in the embodiment of the present application can be applied to any power control circuit in any of the above embodiments of the present application, and can specifically include the following steps:

[0085] Step 910, detecting a start signal;

[0086] Step 920, outputting a capacitor on / off control signal according to the start signal;

[0087] The capacitor on-off control signal is divided into a first control signal and a second control signal, the first control signal is used to control the drive circuit module to enter the on state, and the second control signal is used to control the drive circuit module to enter the off state;

[0088] Step 930: When the driving circuit module enters the on state, the Y capacitor on the secondary side of the converter is controlled to enter the connected working state through the driving circuit module in the on state.

[0089] The connection working state is a conduction state in which the Y capacitor is electrically connected to the primary side of the transformer T.

[0090] Specifically, the power supply control method provided in the embodiment of the present application can be applied to the power supply control circuit of any one of the above embodiments of the present application, by detecting the start signal to output the capacitor on-off control signal according to the start signal, so that the drive circuit module can be controlled to enter the on state when the capacitor on-off control signal is the first control signal, so that the Y capacitor on the secondary side of the converter can enter the working connection state through the drive circuit module in the on state, thereby solving the control failure problem caused by the switching power supply removing the Y capacitor between the primary and secondary sides of the transformer in the existing related technology; and when the capacitor on-off control signal is the second control signal, the drive circuit module is controlled to enter the off state, so that the Y capacitor on the secondary side of the transformer enters the non-working connection state, that is, the Y capacitor on the secondary side of the transformer enters the off state, so as to cut off the startup interference path, so that the startup interference generated by this part of the circuit on the primary side of the transformer cannot be coupled to the secondary side of the transformer through the Y capacitor, thereby solving the communication interference problem caused by the use of switching power supply in the existing related technology.

[0091] In some optional embodiments of the present application, in order to reduce the communication interference generated at startup, the electrical device can record the startup duration according to the startup signal when the startup signal is detected, so as to determine the capacitor on-off control signal that needs to be output according to the startup duration. Optionally, the embodiment of the present application outputs the capacitor on-off control signal according to the startup signal, which may specifically include: determining the startup duration according to the startup signal; if the startup duration is less than the preset duration threshold, outputting the second control signal; if the startup duration is not less than the preset duration threshold, outputting the first control signal.

[0092] Among them, the preset time threshold can be set according to the interference time generated during startup. For example, when the startup interference is mainly generated in the 1 minute when the compressor is just powered on, that is, after the startup time reaches 1 minute, there will be basically no communication interference. Therefore, the preset time threshold can be set to 1 minute. The embodiment of the present application does not impose specific restrictions on this.

[0093] Optionally, the power control method provided in the embodiment of the present application also includes: when the transmitting end of the communication circuit module stops transmitting, outputting a third control signal to the transmitting end; and controlling the transmitting end to enter a stop suspend state through the third control signal.

[0094] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place or distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0095] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiment.

[0096] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0097] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A power control circuit, characterized in that: include: A switching power supply module and a driving circuit module; wherein the switching power supply module comprises a transformer and a mainboard control unit; The first end of the primary side of the transformer is electrically connected to the power input end of the switching power supply module, the second end of the primary side of the transformer is electrically connected to the first end of the mainboard control unit, and the second end of the mainboard control unit is electrically connected to the control end of the driving circuit module; The mainboard control unit is used to output a capacitor on-off control signal to the control end of the driving circuit module according to the detected start signal; the capacitor on-off control signal is divided into a first control signal and a second control signal, the first control signal is used to control the driving circuit module to enter an on state, and the second control signal is used to control the driving circuit module to enter an off state; When the driving circuit module enters the on-state, the Y capacitor of the secondary side of the transformer enters a working connection state through the driving circuit module in the on-state.

2. The power control circuit according to claim 1, characterized in that: The driving circuit module includes a relay, a control end of the relay is electrically connected to the control end of the driving circuit module, a first end of the relay is electrically connected to the second end of the Y capacitor, the second end of the relay is electrically connected to the first end of the secondary side of the converter, and the first end of the Y capacitor is electrically connected to the first end of the primary side of the transformer; When the relay is energized, the drive circuit module enters the conducting state; When the relay is disconnected, the drive circuit module enters the disconnected state.

3. The power control circuit according to claim 1, characterized in that: The driving circuit module includes a relay, a control end of the relay is electrically connected to the control end of the driving circuit module, a first end of the relay is electrically connected to a first end of the primary side of the transformer, a second end of the relay is electrically connected to a first end of the Y capacitor, and a second end of the Y capacitor is electrically connected to a first end of the secondary side of the converter; When the relay is energized, the drive circuit module enters the conducting state; When the relay is disconnected, the drive circuit module enters the disconnected state.

4. The power supply control circuit according to claim 2 or 3, characterized in that: The driving circuit module further includes: a first transistor, a first diode and a first capacitor; The control end of the relay includes a first end of the coil of the relay and a second end of the coil of the relay, the first end of the coil, the first end of the first capacitor, the cathode of the first diode and the second end of the secondary side of the transformer are electrically connected, the second end of the coil, the second end of the first capacitor, the anode of the first diode and the first end of the first transistor are electrically connected, the control end of the first transistor is electrically connected to the control end of the drive circuit module, and the second end of the first transistor is electrically connected to the reference ground of the power control circuit.

5. The power control circuit according to any one of claims 1 to 3, characterized in that: The mainboard control unit includes: a switching power supply controller and a detection feedback circuit; The detection input end of the detection feedback circuit is electrically connected to the second end of the secondary side of the transformer, the output end of the detection feedback circuit is electrically connected to the first end of the switching power supply controller, and the second end of the switching power supply controller is electrically connected to the control end of the driving circuit module; The detection feedback circuit is used to detect the current signal; The switching power supply controller is used to: determine the start signal based on the current signal, and output the second control signal when the start duration corresponding to the start signal is less than a preset duration threshold, and output the first control signal when the start duration is not less than the preset duration threshold.

6. The power control circuit according to claim 5, characterized in that: The detection feedback circuit includes: a first resistor and an optocoupler device, the input end of the optocoupler device is electrically connected to the second end of the secondary side of the transformer, and the output end of the optocoupler device is electrically connected to the first end of the switching power supply controller through the first resistor.

7. The power control circuit according to any one of claims 1 to 3, characterized in that: The switching power supply module also includes an output rectifier circuit of the transformer; The input end of the output rectifier circuit is electrically connected to the second end of the secondary side of the transformer, and the output end of the output rectifier current, the driving power supply end of the driving circuit module and the detection input end of the mainboard control unit are electrically connected.

8. The power control circuit according to claim 7, characterized in that: The output rectifier circuit includes: a second diode, a second resistor and a second capacitor; The anode of the second diode, the first end of the second capacitor and the second end of the secondary side of the transformer are electrically connected, the second end of the second capacitor is electrically connected to the first end of the second resistor, the cathode of the second diode, the second end of the second resistor, the output end of the output rectified current, the driving power supply end of the driving circuit module and the detection input end of the mainboard control unit are electrically connected; or, The anode of the second diode, the first end of the second resistor and the second end of the secondary side of the transformer are electrically connected, the second end of the second resistor is electrically connected to the first end of the second capacitor, the cathode of the second diode, the second end of the second capacitor, the output end of the output rectified current, the driving power supply end of the driving circuit module and the detection input end of the mainboard control unit are electrically connected.

9. The power control circuit according to claim 7, characterized in that: The switching power supply module also includes: an auxiliary winding circuit of the transformer, the input end of the auxiliary winding circuit is electrically connected to the second end of the primary side of the transformer, the output end of the auxiliary winding circuit is electrically connected to the first end of the mainboard control unit, and the output end of the auxiliary winding circuit is used to output a power supply signal, and the power supply signal is used to power the mainboard control unit.

10. The power control circuit according to claim 9, characterized in that: Also includes: A communication circuit module, wherein the transmitting end of the communication circuit module is electrically connected to the third end of the mainboard control unit, and the mainboard control unit is also used to: when the transmitting end stops transmitting, output a third control signal to the transmitting end, and the third control signal is used to control the transmitting end of the communication circuit module to enter a stop and suspend state.

11. The power supply control circuit according to claim 10, characterized in that: The output end of the communication circuit module includes at least two connectors connected in parallel, and the at least two parallel connectors include a first connector and a second connector, the first connector is used to connect to the device display panel, and the second connector is used to connect to the test device.

12. The power control circuit according to claim 10, characterized in that: The communication circuit module includes a second transistor and a third capacitor, the control end of the second transistor is electrically connected to the third end of the mainboard control unit, the first end of the second transistor, the power end of the communication circuit module and the power end of the connector are electrically connected, the second end of the second transistor, the first end of the third capacitor and the first transmission end of the connector are electrically connected, and the second end of the third capacitor is electrically connected to the reference ground of the power control circuit.

13. A mainboard, characterized in that: The mainboard includes the power control circuit as described in any one of claims 1 to 12.

14. An electrical device, characterized in that: It comprises a power control circuit as claimed in any one of claims 1 to 12.

15. A power supply control method, characterized in that: A power supply control circuit as claimed in any one of claims 1 to 12, comprising: Detection start signal; According to the start signal, a capacitor on-off control signal is output; the capacitor on-off control signal is divided into a first control signal and a second control signal, the first control signal is used to control the drive circuit module to enter an on state, and the second control signal is used to control the drive circuit module to enter an off state; When the driving circuit module enters the on-state, the Y capacitor on the secondary side of the converter is controlled to enter a connected working state through the driving circuit module in the on-state.

16. The power control method according to claim 15, characterized in that: The output capacitor on / off control signal according to the start signal includes: Determining a start-up duration according to the start-up signal; If the startup duration is less than a preset duration threshold, outputting the second control signal; If the startup duration is not less than the preset duration threshold, the first control signal is output.

17. The power control method according to claim 16, characterized in that: Also includes: When the transmitting end of the communication circuit module stops transmitting, outputting a third control signal to the transmitting end; The transmitting end is controlled to enter a stop suspend state through the third control signal.

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