Apparatus for reducing standby power consumption of a circuit board

Abstract

The utility model relates to circuit board technical field discloses a kind of standby power consumption devices of reducing circuit board, comprising: rectifier filter module, transformer, feedback adjustable resistance group, feedback regulation module and power supply module.The input end of rectifier filter module is connected with external power supply end, and the output end of rectifier filter module is connected with the primary coil of transformer;The output end of feedback regulation module is connected with the primary coil of rectifier filter module and transformer, and the primary coil of transformer is equipped with auxiliary winding voltage port;Feedback adjustable resistance group is connected with auxiliary winding voltage port and the input end of feedback regulation module;The secondary coil of transformer is connected with the input end of power supply module;When determining the current resistance of feedback adjustable resistance group, feedback regulation module adjusts the voltage of auxiliary winding voltage port, to reduce the power supply voltage output by power supply module, to reduce load power consumption, to reduce the standby power consumption of complete machine, facilitate to carry out the test of different power consumption demand, reduce test cost.

Description

Technical Field

[0001] This utility model relates to the technical field of circuit boards, and in particular to a device for reducing the standby power consumption of circuit boards. Background Technology

[0002] In order to improve testing efficiency, users have increasingly higher requirements for the standby power consumption of circuit boards. Most existing methods to improve standby power consumption are to increase the load, set current limiting resistors, or use low-power components. However, low-power components are usually expensive and cannot meet the standby power consumption requirements of users when standing still at the critical point. Utility Model Content

[0003] The purpose of this invention is to provide a device for reducing the standby power consumption of a circuit board, so as to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] To achieve the above objectives, some embodiments of this application provide a device for reducing the standby power consumption of a circuit board. The device includes: a rectifier filter module, a transformer, a feedback adjustable resistor group, a feedback adjustment module, and a power supply module.

[0005] The input terminal of the rectifier and filter module is connected to the external power supply terminal, and the output terminal of the rectifier and filter module is connected to the primary coil of the transformer.

[0006] The output terminal of the feedback adjustment module is connected to the rectifier filter module and the primary coil of the transformer, respectively. The primary coil of the transformer is provided with an auxiliary winding voltage port.

[0007] The adjustable feedback resistor group is connected to the auxiliary winding voltage port and the input terminal of the feedback adjustment module, respectively; the secondary coil of the transformer is connected to the input terminal of the power supply module.

[0008] The feedback adjustment module is used to adjust the voltage of the auxiliary winding voltage port when determining the current resistance value of the feedback adjustable resistor group, so as to reduce the power supply voltage output by the power supply module.

[0009] Furthermore, the adjustable feedback resistor group includes: a feedback pull-up resistor and a parallel feedback pull-down resistor group;

[0010] One end of the feedback pull-up resistor is connected to the auxiliary winding voltage port, the other end of the feedback pull-up resistor is connected to one end of the feedback pull-down parallel resistor group, and one end of the feedback pull-down parallel resistor group is connected to the input terminal of the feedback adjustment module.

[0011] Furthermore, the feedback adjustment module includes: a feedback adjustment chip, a first parallel resistor group, and a first diode;

[0012] The input terminal of the feedback adjustment chip is connected to the feedback adjustable resistor group, the current sensing terminal of the feedback adjustment chip is connected to one end of the first parallel resistor group, and the ground terminal of the feedback adjustment chip and the other end of the first parallel resistor group are both connected to ground.

[0013] The output terminal of the feedback regulation chip is connected to the anode of the first diode and the primary coil of the transformer, respectively, and the cathode of the first diode is connected to the rectifier and filter module.

[0014] Furthermore, the rectifier and filter module includes: a rectifier, a first power supply port, a series resistor group, and a filter and voltage regulator circuit;

[0015] The input terminal of the rectifier is connected to an external power supply terminal, the output terminal of the rectifier is connected to the primary coil of the transformer, one end of the series resistor group and the output terminal of the filter voltage regulator circuit are both connected to the primary coil of the transformer, the other end of the series resistor group is connected to the first power supply port, and the input terminal of the filter voltage regulator circuit is connected to the output terminal of the feedback adjustment module.

[0016] Furthermore, the device for reducing the standby power consumption of the circuit board also includes: a second power supply port, a parallel capacitor bank, and a current limiting circuit;

[0017] The input terminal of the current limiting circuit is connected to the primary coil of the transformer through the auxiliary winding voltage port. The output terminal of the current limiting circuit is connected to one end of the parallel capacitor bank, and the other end of the parallel capacitor bank is connected to ground. The second power supply port is connected to one end of the parallel capacitor bank and the power supply terminal of the feedback adjustment module, respectively.

[0018] Furthermore, the power supply module includes: a filter power supply circuit, a second diode, and a rectifier and voltage regulator circuit;

[0019] The anode of the second diode is connected to the secondary coil of the transformer, the cathode of the second diode is connected to the filter power supply circuit, the input terminal of the rectifier and voltage regulator circuit is connected to the anode of the second diode, and the output terminal of the rectifier and voltage regulator circuit is connected to the filter power supply circuit.

[0020] Furthermore, the feedback pull-down parallel resistor group includes: a first pull-down resistor and a second pull-down resistor;

[0021] The first pull-down resistor and the second pull-down resistor are connected in parallel. One end of the first pull-down resistor is connected to the other end of the feedback pull-up resistor. One end of the second pull-down resistor is connected to the input terminal of the feedback adjustment module. The other ends of the first pull-down resistor and the other ends of the second pull-down resistor are both connected to ground.

[0022] Furthermore, the filter and voltage regulator circuit includes: an RC series circuit and a second parallel resistor group;

[0023] One end of the RC series circuit and one end of the second parallel resistor group are both connected to the output terminal of the feedback adjustment module, and the other end of the RC series circuit and the other end of the second parallel resistor group are both connected to the primary coil of the transformer.

[0024] Furthermore, both the first pull-down resistor and the second pull-down resistor are adjustable resistors.

[0025] Furthermore, the feedback adjustment chip is an LN1F19 chip.

[0026] The beneficial effects of this utility model are as follows: According to the user's standby power consumption requirements, the feedback adjustable resistor group is adjusted, and the voltage at the transformer auxiliary winding is adjusted through the feedback adjustment module to reduce the voltage of the transformer auxiliary winding. Based on the transformer's step-up and step-down principle, the output voltage of the power supply module is reduced, thereby reducing load power consumption and thus reducing the standby power consumption of the whole machine. By setting the feedback adjustable resistor group, the applicability of the device in the testing phase is improved, making it easier to test different power consumption requirements and reducing testing costs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the circuit structure of a device for reducing standby power consumption of a circuit board according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of a circuit structure for a device to reduce standby power consumption of a circuit board, provided in another embodiment of this utility model.

[0029] Figure 3 This is a schematic diagram of the frame of a device for reducing standby power consumption of a circuit board according to an embodiment of the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and should not be construed as limiting the scope of this invention.

[0031] It should be noted that although functional modules are divided in the diagram, in some cases, the modules can be divided differently from those in the system.

[0032] Furthermore, it is understood that the terms "first," "second," etc., used in this application may be used herein to describe various concepts, but unless specifically stated otherwise, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more features. For example, without departing from the scope of embodiments of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the words "if" or "when" as used herein may be interpreted as "in the event of," "when," or "in response to a determination."

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0034] As described in the background art, in the prior art, in order to improve testing efficiency, users have increasingly higher requirements for the standby power consumption of circuit boards. Most existing methods to improve standby power consumption are to increase the load, set current limiting resistors, or use low-power components. However, low-power components are usually expensive and cannot meet the standby power consumption requirements of users when standing still at the critical point.

[0035] Reference Figure 1 and Figure 3 In some embodiments of this utility model, a device for reducing the standby power consumption of a circuit board includes: a power supply module 400, a transformer T1, a feedback adjustment module 300, a feedback adjustable resistor group 200, and a rectifier and filter module 100.

[0036] The input terminal of the rectifier and filter module 100 is electrically connected to the external power supply terminal, and the output terminal of the rectifier and filter module 100 is electrically connected to the primary coil of the transformer T1. The rectifier and filter module 100 is used to rectify and filter the AC voltage supplied by the external power supply terminal to obtain the first power supply voltage, and output the first power supply voltage to the transformer T1.

[0037] The primary coil of transformer T1 includes an auxiliary winding, and the turns ratio of the auxiliary winding to the secondary coil of transformer T1 is 1:1.

[0038] The primary coil of transformer T1 has an auxiliary winding voltage port VCC. The auxiliary winding voltage port VCC is electrically connected to one end of the feedback adjustable resistor group 200, and the other end of the feedback adjustable resistor group 200 is electrically connected to the input terminal of the feedback adjustment module 300.

[0039] The feedback adjustable resistor group 200 is used to respond to user triggering and determine the current resistance value. The voltage of the auxiliary winding provides a first feedback adjustment signal to the feedback adjustment module 300 through the current resistance value of the feedback adjustable resistor group 200. The first feedback adjustment signal is a voltage signal after voltage division.

[0040] The input terminal of the feedback adjustment module 300 is electrically connected to one end of the feedback adjustable resistor group 200, the output terminal of the feedback adjustment module 300 is electrically connected to the primary coil of the transformer T1, and the output terminal of the feedback adjustment module 300 is also electrically connected to the rectifier filter module 100.

[0041] The feedback adjustment module 300 can adjust the first supply voltage supplied to the primary coil of transformer T1 according to the current resistance value of the feedback adjustable resistor group 200, thereby adjusting the voltage of the auxiliary winding voltage port VCC in transformer T1. In other words, the feedback adjustment module 300 can adjust the first supply voltage supplied to the primary coil of transformer T1 according to the first feedback adjustment signal output by the feedback adjustable resistor group 200, thereby adjusting the voltage of the auxiliary winding voltage port VCC in transformer T1.

[0042] The secondary coil of transformer T1 is electrically connected to the input terminal of power supply module 400. Transformer T1 steps down the first power supply voltage and outputs the second power supply voltage to power supply module 400.

[0043] The power supply module 400 can rectify and filter the second power supply voltage and supply the rectified and filtered second power supply voltage to the downstream load.

[0044] For example, in response to a user trigger, the feedback adjustable resistor group 200 is adjusted, and the feedback adjustable resistor group 200 provides a first feedback adjustment signal to the feedback adjustment module 300. According to the first feedback adjustment signal, the feedback adjustment module 300 reduces the first supply voltage supplied to the primary coil of the transformer T1, reduces the voltage of the auxiliary winding in the transformer T1, and the volt per turn of the auxiliary winding is also reduced accordingly. Based on the 1:1 turns ratio of the volt per turn of the secondary winding of the transformer T1 to the auxiliary winding, the second supply voltage is reduced to reduce the supply voltage output by the power supply module 400.

[0045] Based on the user's standby power consumption requirements, the feedback adjustable resistor group 200 is adjusted, and feedback adjustment module 300 is used to adjust the voltage at the transformer auxiliary winding, thereby reducing the voltage of the transformer auxiliary winding. Based on the step-up and step-down principle of transformer T1, the output voltage of power supply module 400 is reduced, thereby reducing load power consumption and thus reducing the standby power consumption of the whole device. By setting the feedback adjustable resistor group 200, the applicability of the device in the testing phase is improved, making it easier to test different power consumption requirements and reducing testing costs.

[0046] Reference Figure 1 and Figure 3 In some embodiments of this utility model, the feedback adjustable resistor group 200 includes: a feedback pull-up resistor R1 and a feedback pull-down parallel resistor group.

[0047] One end of the feedback pull-up resistor R1 is electrically connected to the auxiliary winding voltage port VCC, and the other end of the feedback pull-up resistor R1 is electrically connected to one end of the feedback pull-down parallel resistor group. One end of the feedback pull-down parallel resistor group is electrically connected to the input terminal of the feedback adjustment module 300. In other words, both one end of the feedback pull-down parallel resistor group and the other end of the feedback pull-up resistor R1 are electrically connected to the input terminal of the feedback adjustment module 300. The other end of the feedback pull-down parallel resistor group is grounded.

[0048] The feedback pull-down parallel resistor group includes: a first pull-down resistor R3 and a second pull-down resistor R4.

[0049] The first pull-down resistor R3 and the second pull-down resistor R4 are connected in parallel. One end of the first pull-down resistor R3 is connected to the other end of the feedback pull-up resistor R1, and one end of the second pull-down resistor R4 is electrically connected to the input terminal of the feedback adjustment module 300.

[0050] In other words, one end of the first pull-down resistor R3 is electrically connected to the other end of the feedback pull-up resistor R1, one end of the second pull-down resistor R4, and the input terminal of the feedback adjustment module 300. One end of the second pull-down resistor R4 is electrically connected to the other end of the feedback pull-up resistor R1, one end of the first pull-down resistor R3, and the input terminal of the feedback adjustment module 300.

[0051] The other ends of the first pull-down resistor R3 and the second pull-down resistor R4 are both grounded. Both the first pull-down resistor R3 and the second pull-down resistor R4 are adjustable resistors. The feedback pull-up resistor R1 is a non-adjustable resistor.

[0052] In one embodiment, the reference voltage VREF set by the feedback adjustment module 300 and the set user standby power consumption requirements are obtained. Based on the set reference voltage VREF, feedback pull-up resistor R1, first pull-down resistor R3, and second pull-down resistor R4, the voltage of the auxiliary winding voltage port VCC is determined. The relationship between the parallel resistance of the first pull-down resistor R3 and the second pull-down resistor R4 and the voltage of the auxiliary winding voltage port VCC is determined as follows: VCC = (1 + R1 / R3 / / R4) * VREF. Using the above relationship, the parallel resistance of the first pull-down resistor R3 and the second pull-down resistor R4 is adjusted according to the set user standby power consumption requirements, thereby adjusting the voltage of the auxiliary winding voltage port VCC in transformer T1, so as to adjust the power supply voltage output by the power supply module 400, satisfying the user's standby power consumption requirements, and conducting tests for different power consumption requirements, thus reducing testing costs.

[0053] Reference Figure 1 and Figure 3 In some embodiments of this utility model, the feedback adjustment module 300 includes: a feedback adjustment chip U2, a first parallel resistor group, and a first diode D1.

[0054] The feedback regulation chip U2 is model LN1F19.

[0055] The input terminal of the feedback regulating chip U2 is electrically connected to one end of the feedback pull-down parallel resistor group in the feedback adjustable resistor group 200, that is, the first pin of the feedback regulating chip U2 is electrically connected to one end of the feedback pull-down parallel resistor group in the feedback adjustable resistor group 200.

[0056] The current sensing terminal of the feedback regulation chip U2 is electrically connected to one end of the first parallel resistor group, and the other end of the first parallel resistor group is grounded. In other words, the second pin of the feedback regulation chip U2 is grounded through the first parallel resistor group.

[0057] The first parallel resistor group consists of the fifth resistor R5 and the sixth resistor R6 connected in parallel.

[0058] The ground terminal of the feedback regulation chip U2 is grounded, that is, the second pin of the feedback regulation chip U2 is grounded.

[0059] The output terminal of the feedback regulating chip U2 is electrically connected to the anode of the first diode D1, the output terminal of the feedback regulating chip U2 is electrically connected to the primary coil of the transformer T1, and the cathode of the first diode D1 is electrically connected to the input terminal of the filter and voltage regulator circuit 110 in the rectifier and filter module 100.

[0060] Among them, the fifth to eighth pins of the feedback regulation chip U2 are all electrically connected to the primary coil of the transformer T1, and the eighth pin of the feedback regulation chip U2 is electrically connected to the anode of the first diode D1.

[0061] Reference Figures 1 to 3 In some embodiments of this utility model, the rectifier and filter module 100 includes: a rectifier U1, a first power supply port HV+, a series resistor group, and a filter and voltage regulator circuit 110.

[0062] The input terminal of rectifier U1 is electrically connected to the external power supply terminal, and the output terminal of rectifier U1 is electrically connected to the primary coil of transformer T1. Rectifier U1 is used to rectify the AC voltage supplied by the external power supply terminal.

[0063] One end of the series resistor group is electrically connected to the primary coil of transformer T1, and the other end of the series resistor group is electrically connected to the first power supply port HV+. The series resistor group is composed of the seventh resistor R7 and the eighth resistor R8 connected in series.

[0064] The input terminal of the filter and voltage regulator circuit 110 is electrically connected to the cathode of the first diode D1 in the feedback adjustment module 300, which is also electrically connected to the output terminal of the feedback adjustment module 300. The output terminal of the filter and voltage regulator circuit 110 is electrically connected to the primary coil of the voice transformer T1.

[0065] The filter and voltage regulator circuit 110 includes an RC series circuit and a second parallel resistor group.

[0066] The RC series circuit is connected in parallel with the second parallel resistor group.

[0067] One end of the RC series circuit is electrically connected to the cathode of the first diode D1, and the other end of the RC series circuit is electrically connected to the primary coil of the transformer T1. One end of the second parallel resistor group is electrically connected to the cathode of the first diode D1, and the other end of the second parallel resistor group is electrically connected to the primary coil of the transformer T1.

[0068] The second parallel resistor group consists of the tenth resistor R10 and the eleventh resistor R11 connected in parallel.

[0069] Reference Figure 1 and Figure 2 In some embodiments of this utility model, the power supply module 400 includes: a filter power supply circuit 410, a second diode D2, and a rectifier and voltage regulator circuit 420.

[0070] The anode of the second diode D2 is electrically connected to the secondary coil of the transformer T1, the cathode of the second diode D2 is electrically connected to the input terminal of the filter power supply circuit 410, the output terminal of the filter power supply circuit 410 is electrically connected to the load, the input terminal of the rectifier voltage regulator circuit 420 is electrically connected to the secondary coil of the transformer T1, and the output terminal of the rectifier voltage regulator circuit 420 is electrically connected to the input terminal of the filter power supply circuit 410.

[0071] The filter power supply circuit 410 includes: the fourteenth resistor R14, the sixth capacitor C6, the seventh capacitor C7, the ninth capacitor C9, the tenth capacitor C10, and the eleventh capacitor C11.

[0072] The fourteenth resistor R14, the ninth capacitor C9, the tenth capacitor C10, and the eleventh capacitor C11 are connected in parallel. One end of the fourteenth resistor R14 is electrically connected to the cathode of the second diode D2, and the other end of the fourteenth resistor R14 is electrically connected to the secondary coil of the transformer T1.

[0073] One end of the seventh capacitor C7 is electrically connected to the secondary coil of transformer T1, and the other end of the seventh capacitor C7 is electrically connected to one end of the sixth capacitor C6, while the other end of the sixth capacitor C6 is grounded.

[0074] The rectifier and voltage regulator circuit 420 includes: the eighth capacitor C8 and the thirteenth resistor R13.

[0075] One end of the eighth capacitor C8 is electrically connected to one end of the fourteenth resistor R14 and the positive terminal of the ninth capacitor C9, respectively. The other end of the eighth capacitor C8 is electrically connected to one end of the thirteenth resistor R13, and the other end of the thirteenth resistor R13 is electrically connected to the anode of the second diode D2 and the secondary coil of the transformer T1, respectively.

[0076] Reference Figures 1 to 3 The devices for reducing the standby power consumption of the circuit board also include: a second power supply port VDD, a parallel capacitor bank, and a current limiting circuit.

[0077] The input terminal of the current limiting circuit is electrically connected to the primary coil of transformer T1 through the auxiliary winding voltage port VCC. The output terminal of the current limiting circuit is electrically connected to one end of the parallel capacitor bank. One end of the parallel capacitor bank is also electrically connected to the second power supply port VDD. The other end of the parallel capacitor bank is grounded.

[0078] The second power supply port VDD is electrically connected to the power supply terminal in the feedback regulation chip U2, that is, electrically connected to the third pin in the feedback regulation chip U2, so as to realize the connection with the power supply terminal of the feedback regulation module 300.

[0079] The current-limiting circuit consists of a twelfth resistor R12 and a third diode D3 connected in series. The anode of the third diode D3 is electrically connected to the primary coil of transformer T1, and the cathode of the third diode D3 is electrically connected to the twelfth resistor R12. The first power supply port HV+ is electrically connected to both the cathode of the third diode D3 and the twelfth resistor R12.

[0080] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A device for reducing standby power consumption of a circuit board, characterized in that, include: Rectifier and filter module, transformer, feedback adjustable resistor group, feedback regulation module and power supply module; The input terminal of the rectifier and filter module is connected to the external power supply terminal, and the output terminal of the rectifier and filter module is connected to the primary coil of the transformer. The output terminal of the feedback adjustment module is connected to the rectifier filter module and the primary coil of the transformer, respectively. The primary coil of the transformer is provided with an auxiliary winding voltage port. The adjustable feedback resistor group is connected to the auxiliary winding voltage port and the input terminal of the feedback adjustment module, respectively; the secondary coil of the transformer is connected to the input terminal of the power supply module. The feedback adjustment module is used to adjust the voltage of the auxiliary winding voltage port when determining the current resistance value of the feedback adjustable resistor group, so as to reduce the power supply voltage output by the power supply module.

2. The device for reducing standby power consumption of a circuit board according to claim 1, characterized in that, The adjustable feedback resistor group includes: a feedback pull-up resistor and a parallel feedback pull-down resistor group; One end of the feedback pull-up resistor is connected to the auxiliary winding voltage port, the other end of the feedback pull-up resistor is connected to one end of the feedback pull-down parallel resistor group, and one end of the feedback pull-down parallel resistor group is connected to the input terminal of the feedback adjustment module.

3. The device for reducing standby power consumption of a circuit board according to claim 1, characterized in that, The feedback adjustment module includes: a feedback adjustment chip, a first parallel resistor group, and a first diode; The input terminal of the feedback adjustment chip is connected to the feedback adjustable resistor group, the current sensing terminal of the feedback adjustment chip is connected to one end of the first parallel resistor group, and the ground terminal of the feedback adjustment chip and the other end of the first parallel resistor group are both connected to ground. The output terminal of the feedback regulation chip is connected to the anode of the first diode and the primary coil of the transformer, respectively, and the cathode of the first diode is connected to the rectifier and filter module.

4. The device for reducing standby power consumption of a circuit board according to claim 1, characterized in that, The rectifier and filter module includes: a rectifier, a first power supply port, a series resistor group, and a filter and voltage regulator circuit; The input terminal of the rectifier is connected to an external power supply terminal, the output terminal of the rectifier is connected to the primary coil of the transformer, one end of the series resistor group and the output terminal of the filter voltage regulator circuit are both connected to the primary coil of the transformer, the other end of the series resistor group is connected to the first power supply port, and the input terminal of the filter voltage regulator circuit is connected to the output terminal of the feedback adjustment module.

5. The device for reducing standby power consumption of a circuit board according to claim 1, characterized in that, The device also includes: a second power supply port, a parallel capacitor bank, and a current limiting circuit; The input terminal of the current limiting circuit is connected to the primary coil of the transformer through the auxiliary winding voltage port. The output terminal of the current limiting circuit is connected to one end of the parallel capacitor bank, and the other end of the parallel capacitor bank is connected to ground. The second power supply port is connected to one end of the parallel capacitor bank and the power supply terminal of the feedback adjustment module, respectively.

6. The device for reducing standby power consumption of a circuit board according to claim 1, characterized in that, The power supply module includes: a filter power supply circuit, a second diode, and a rectifier and voltage regulator circuit; The anode of the second diode is connected to the secondary coil of the transformer, the cathode of the second diode is connected to the filter power supply circuit, the input terminal of the rectifier and voltage regulator circuit is connected to the anode of the second diode, and the output terminal of the rectifier and voltage regulator circuit is connected to the filter power supply circuit.

7. The device for reducing standby power consumption of a circuit board according to claim 2, characterized in that, The feedback pull-down parallel resistor group includes: a first pull-down resistor and a second pull-down resistor; The first pull-down resistor and the second pull-down resistor are connected in parallel. One end of the first pull-down resistor is connected to the other end of the feedback pull-up resistor. One end of the second pull-down resistor is connected to the input terminal of the feedback adjustment module. The other ends of the first pull-down resistor and the other ends of the second pull-down resistor are both connected to ground.

8. The device for reducing standby power consumption of a circuit board according to claim 4, characterized in that, The filter and voltage regulator circuit includes: an RC series circuit and a second parallel resistor group; One end of the RC series circuit and one end of the second parallel resistor group are both connected to the output terminal of the feedback adjustment module, and the other end of the RC series circuit and the other end of the second parallel resistor group are both connected to the primary coil of the transformer.

9. The device for reducing standby power consumption of a circuit board according to claim 7, characterized in that, Both the first pull-down resistor and the second pull-down resistor are adjustable resistors.

10. The device for reducing standby power consumption of a circuit board according to claim 3, characterized in that, The feedback adjustment chip is model LN1F19.

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