CN-122001197-A - Dummy load control circuit, power panel and terminal equipment

Abstract

The application discloses a dummy load control circuit, a power panel and terminal equipment, wherein the dummy load control circuit comprises an energy storage module, a voltage sampling module, a switch control module and an access control module, the energy storage module is connected to a circuit power supply end, the voltage sampling module is used for generating a first control signal when sampling voltage is greater than or equal to a preset voltage threshold value, the switch control module is used for switching off when power is off or responding to the first control signal and generating a second control signal based on working voltage conduction when standby, the access control module is used for switching off in response to the second control signal, so that the dummy load is electrically disconnected from the power panel output end, and when the switch control module is switched off, the dummy load is electrically conducted with the power panel output end based on the stored voltage or the working voltage conduction. According to the application, the dummy load is automatically switched according to the load of the output end of the power panel, and the dummy load is maintained to be connected when the power panel is powered down so as to discharge the electric energy stored in the capacitor of the output end, thereby improving the safety and reliability.

Inventors

• HUANG XIANSHENG
• HU FENG

Assignees

• 广州视源电子科技股份有限公司
• 广州视琨电子科技有限公司

Dates

Publication Date

20260508

Application Date

20241107

Claims (10)

1. 1. A dummy load control circuit, comprising: the energy storage module is connected to the circuit power supply end; The voltage sampling module is connected to the output end of the power panel and used for sampling the output voltage of the power panel to obtain a sampling voltage, and generating a first control signal when the sampling voltage is greater than or equal to a preset voltage threshold value; the switch control module is connected with the voltage sampling module and the circuit power supply end and is used for being disconnected when power is off or the first control signal is received, and being conducted based on the working voltage provided by the circuit power supply end when the switch control module is in standby state, so as to generate a second control signal; The switch control module is connected to the switch control module, the circuit power supply end, the energy storage module and the dummy load, and is used for responding to the disconnection of the second control signal so as to enable the electrical disconnection between the dummy load and the power panel output end, and when the switch control module is disconnected, the switch control module is conducted based on the energy storage voltage provided by the energy storage module or the working voltage provided by the circuit power supply end so as to enable the electrical connection between the dummy load and the power panel output end.
2. 2. The dummy load control circuit of claim 1, wherein the voltage sampling module comprises a first voltage dividing unit and a comparison unit; One end of the first voltage dividing unit is connected with the output end of the power panel, the other end of the first voltage dividing unit is connected with the grounding end, and a first voltage dividing node of the first voltage dividing unit is connected with the comparison unit so as to output the sampling voltage; the first end of the comparison unit is connected with the switch control module, the second end of the comparison unit is connected with the grounding end, the reference end of the comparison unit is connected with the first voltage division node of the first voltage division unit so as to be connected with the sampling voltage, and the comparison unit is used for controlling the electrical conduction between the switch control module and the grounding end to generate the first control signal when the sampling voltage is greater than or equal to the preset voltage threshold value.
3. 3. The dummy load control circuit according to claim 2, wherein the first voltage dividing unit includes a first resistor circuit and a second resistor circuit, one end of the first resistor circuit is connected to the power board output terminal, the other end is connected to one end of the second resistor circuit, the other end of the second resistor circuit is connected to the ground terminal, and a connection node of the first resistor circuit and the second resistor circuit is connected to the reference terminal of the comparing unit.
4. 4. The dummy load control circuit of claim 2, wherein the comparison unit comprises a regulator tube, and the preset voltage threshold is equal to an on-voltage of the regulator tube.
5. 5. The dummy load control circuit of claim 1, wherein the switch control module comprises a first switch unit, a second voltage division unit, and a second switch unit; One end of the first switch unit is connected with the circuit power supply end, the other end of the first switch unit is connected with one end of the second voltage division unit, the other end of the second voltage division unit is connected with the grounding end, a second voltage division node of the second voltage division unit is connected with the control end of the second switch unit, the first end of the second switch unit is connected with the access control module, and the second end of the second switch unit is connected with the grounding end; the first switch unit is used for being conducted when in standby or power-on and being disconnected when in power-off; The second voltage division unit is used for generating a first driving signal based on the working voltage and outputting the first driving signal to the second switching unit when the first switching unit is conducted; The second switch unit is used for responding to the first driving signal to control the electric conduction between the access control module and the grounding end so as to generate the second control signal, and when the first switch unit is disconnected or receives the first control signal, the electric disconnection between the access control module and the grounding end is controlled.
6. 6. The dummy load control circuit of claim 5, wherein the first switching unit comprises an optocoupler light receiver, and an optocoupler light emitter adapted to the optocoupler light receiver is disposed on the power board to emit light during standby or power-up.
7. 7. The dummy load control circuit of claim 1, wherein the access control module comprises a third voltage dividing unit and a third switching unit; one end of the third voltage division unit is connected with the energy storage module and the circuit power supply end, the other end of the third voltage division unit is connected with the grounding end, a third voltage division node of the third voltage division unit is connected with the control end of the third switch unit, the first end of the third switch unit is connected with the dummy load, and the second end of the third switch unit is connected with the grounding end; The third voltage dividing unit is used for generating a second driving signal based on the energy storage voltage or the working voltage and outputting the second driving signal to the third switching unit; The third switch unit is configured to control electrical conduction between the dummy load and the ground terminal in response to the second driving signal, so as to electrically conduct between the dummy load and the power panel output terminal, and control electrical disconnection between the dummy load and the ground terminal when receiving the second control signal, so as to electrically disconnect between the dummy load and the power panel output terminal.
8. 8. The dummy load control circuit of claim 1, wherein the energy storage module comprises an energy storage capacitor having one end connected to ground and the other end connected to the power supply terminal of the circuit.
9. 9. A power strip comprising a power strip body, a dummy load and a dummy load control circuit as claimed in any one of claims 1 to 8.
10. 10. A terminal device comprising a device body and the dummy load control circuit according to any one of claims 1 to 8 or the power panel according to claim 9 provided to the device body.

Description

Dummy load control circuit, power panel and terminal equipment Technical Field The application relates to the technical field of power supplies, in particular to a dummy load control circuit, a power panel and terminal equipment. Background At present, the power supply products are increasingly applied, for a power supply with multiple outputs, dummy loads are generally introduced into an output branch without feedback to avoid the floating height of output voltage, and meanwhile, the problem that standby power consumption is high after dummy loads are introduced is solved by controlling the access and the cutting of the dummy loads through external signals. However, the control of the dummy load by using the external signal in the related art has a larger limitation, and when the external signal is in synchronous failure during power-down, the electric energy stored in the capacitor at the output end of the power supply may be shorted to the power panel or cause electric shock. Disclosure of Invention In view of the above, the present application provides a dummy load control circuit, a power strip, and a terminal device, so as to solve the above technical problems. In a first aspect, the present application provides a dummy load control circuit, the dummy load control circuit comprising an energy storage module, a voltage sampling module, a switch control module and an access control module, wherein: the energy storage module is connected to the circuit power supply end; The voltage sampling module is connected to the output end of the power panel and used for sampling the output voltage of the power panel to obtain a sampling voltage, and generating a first control signal when the sampling voltage is greater than or equal to a preset voltage threshold value; the switch control module is connected with the voltage sampling module and the circuit power supply end and is used for being disconnected when power is off or a first control signal is received, and is conducted based on working voltage provided by the circuit power supply end when in standby, so as to generate a second control signal; The switch control module is connected with the switch control module, the circuit power supply end, the energy storage module and the dummy load and is used for responding to the disconnection of the second control signal so as to electrically disconnect the dummy load from the power panel output end, and when the switch control module is disconnected, the power supply is conducted based on the energy storage voltage provided by the energy storage module or the working voltage provided by the circuit power supply end so as to electrically conduct the dummy load from the power panel output end. In one possible implementation of the present application, the voltage sampling module includes a first voltage dividing unit and a comparing unit; One end of the first voltage dividing unit is connected with the output end of the power panel, the other end of the first voltage dividing unit is connected with the grounding end, and a first voltage dividing node of the first voltage dividing unit is connected with the comparison unit so as to output sampling voltage; The first end of the comparison unit is connected with the switch control module, the second end of the comparison unit is connected with the grounding end, the reference end of the comparison unit is connected with the first voltage division node of the first voltage division unit so as to be connected with the sampling voltage, and the comparison unit is used for controlling the switch control module to be electrically conducted with the grounding end so as to generate a first control signal when the sampling voltage is greater than or equal to a preset voltage threshold value. In one possible implementation manner of the present application, the first voltage dividing unit includes a first resistor circuit and a second resistor circuit, one end of the first resistor circuit is connected to the output end of the power board, the other end of the first resistor circuit is connected to one end of the second resistor circuit, the other end of the second resistor circuit is connected to the ground end, and a connection node of the first resistor circuit and the second resistor circuit is connected to the reference end of the comparing unit. In one possible implementation of the present application, the comparing unit includes a voltage regulator tube, and the preset voltage threshold is equal to an on voltage of the voltage regulator tube. In one possible implementation of the present application, the switch control module includes a first switch unit, a second voltage division unit, and a second switch unit; One end of the first switch unit is connected with the circuit power supply end, the other end of the first switch unit is connected with one end of the second voltage division unit, the other end of the second voltage division unit is connected with the groundi