CN-121983909-A - Power supply circuit and electronic equipment

CN121983909ACN 121983909 ACN121983909 ACN 121983909ACN-121983909-A

Abstract

The application provides a power supply circuit and electronic equipment, wherein the power supply circuit comprises a sampling unit, an overcurrent control unit and an output current limiting unit, wherein the sampling unit is used for sampling electric parameters of a load, the overcurrent control unit is connected with the sampling unit and used for determining the state of the load according to the electric parameters and responding to the abnormal state of the load to output a first overcurrent control signal, the output current limiting unit is connected with the overcurrent control unit and the sampling unit and used for responding to the first overcurrent control signal to generate a first threshold value parameter matched with the tripping parameter of a circuit breaker and enabling the electric parameters to follow the first threshold value parameter so as to ensure that the circuit breaker is disconnected with the load based on the electric parameters. Through the power circuit, the short-circuit current can be raised, so that the short-circuit current can trigger the miniature circuit breaker to trip.

Inventors

TANG WEIJIE
LIU SHAOHUI
ZHU WEIGUI

Assignees

湖南麦格米特电气技术有限公司

Dates

Publication Date: 20260505
Application Date: 20251224

Claims (13)

1. A power supply circuit, characterized in that the power supply circuit is connected with a load through a circuit breaker; the power supply circuit includes: The sampling unit is used for sampling the electrical parameters of the load; The overcurrent control unit is connected with the sampling unit and is used for determining the state of the load according to the electrical parameter, and outputting a first overcurrent control signal in response to the abnormal state of the load; And the output current limiting unit is connected with the overcurrent control unit and the sampling unit, responds to the first overcurrent control signal and generates a first threshold parameter matched with the tripping parameter of the circuit breaker, and the electrical parameter is enabled to follow the first threshold parameter so as to ensure that the circuit breaker is disconnected with the load based on the electrical parameter.
2. The power supply circuit of claim 1, wherein the first over-current control signal includes a hold state and a change state, the output current limiting unit generating the first threshold parameter in response to the hold state of the first over-current control signal, and generating a second threshold parameter in response to the change state of the first over-current control signal, the first threshold parameter being greater than the second threshold parameter.
3. The power circuit of claim 2, wherein a duration of a hold state of the first over-current control signal is greater than a delay time of tripping of the circuit breaker.
4. The power supply circuit according to claim 2, wherein the output current limiting unit includes: A threshold providing unit connected to the over-flow control unit for generating the first and second threshold parameters based on the first over-flow control signal; The first operational amplifier unit is connected with the sampling unit and the threshold providing unit and is used for outputting a first control signal according to the electrical parameter and the first threshold parameter or the second threshold parameter.
5. The power supply circuit according to claim 4, wherein the threshold providing unit includes a threshold control unit, a first threshold providing unit and a second threshold providing unit, the threshold control unit is connected to the overcurrent control unit, the first threshold providing unit is connected to the second threshold providing unit and the threshold control unit, and the second threshold providing unit is connected to a reference voltage; The threshold control unit controlling the first threshold providing unit to generate the first threshold parameter based on the reference voltage in response to a hold state of the first overcurrent control signal, and The threshold control unit controls the first threshold providing unit and the second threshold providing unit to generate the second threshold parameter based on the reference voltage and the first overcurrent control signal in common in response to a change state of the first overcurrent control signal.
6. The power supply circuit according to claim 5, wherein the threshold control unit includes: the anode of the first diode is connected with the overcurrent control unit, and the cathode of the first diode is connected with the first threshold value providing unit; In response to the hold state of the first overcurrent control signal, the first diode is not turned on so that the first threshold providing unit generates the first threshold parameter based on the reference voltage, and In response to a changing state of the first overcurrent control signal, the first diode is turned on so that the first threshold providing unit and the second threshold providing unit commonly generate the second threshold parameter based on the reference voltage and the first overcurrent control signal.
7. The power supply circuit according to claim 1, wherein the overcurrent control unit includes: the overcurrent signal generation unit is connected with the sampling unit and is used for outputting an overcurrent signal according to the electrical parameter, responding to the abnormal state of the load, wherein the overcurrent signal is in a first state, responding to the normal state of the load, and the overcurrent signal is in a second state; An integrated signal generating unit connected with the overcurrent signal generating unit and used for generating a first integrated voltage signal according to the overcurrent signal in a first state; And the amplitude limiting unit is connected with the integrated signal generating unit and is used for limiting the first integrated voltage signal so as to obtain the first overcurrent control signal.
8. The power supply circuit of claim 7, wherein the clipping unit comprises: the first amplitude limiting unit is connected with the integrated signal generating unit and is used for controlling the duration time of the initial state of the first overcurrent control signal; And the second amplitude limiting unit is connected with the first amplitude limiting unit and the output current limiting unit.
9. The power circuit of claim 8, wherein the power circuit comprises a power supply circuit, The first clipping unit includes: the cathode of the first voltage stabilizing tube is connected with the integrated signal generating unit, and the anode of the first voltage stabilizing tube is connected with the second amplitude limiting unit; The second clipping unit includes: The first end of the first resistor is connected with the first amplitude limiting unit; the first end of the second voltage stabilizing tube is connected with the second end of the first resistor, and the second end of the second voltage stabilizing tube is grounded.
10. The power supply circuit according to claim 7, wherein the overcurrent signal generating unit includes: The second comparison unit is connected with the sampling unit and the reference voltage, generates an overcurrent threshold based on the reference voltage, compares the electrical parameter with the overcurrent threshold and outputs the overcurrent signal; and the protection unit is connected with the second comparison unit and the integrated signal generation unit.
11. The power supply circuit according to claim 10, wherein the second comparing unit includes: the first voltage division unit is connected with a reference voltage and used for dividing the reference voltage to obtain the overcurrent threshold; the second voltage division unit is connected with the reference voltage and the sampling unit; The first input end of the first comparator is connected with the first voltage division unit, and the second input end of the first comparator is connected with the second voltage division unit; And the integration filtering unit is connected with the output end of the first comparator and the second input end of the first comparator.
12. The power supply circuit according to claim 7, wherein the integrated signal generating unit includes: A second comparator; The voltage division filtering unit is connected with the overcurrent signal generating unit and the first input end of the second comparator; The integrating delay unit is connected with the second input end of the second comparator and the output end of the second comparator, and the output end of the second comparator is connected with the amplitude limiting unit.
13. An electronic device, comprising: A power supply circuit comprising the power supply circuit of any one of claims 1-12; A plurality of loads and a plurality of circuit breakers, each of said loads being connected to said power circuit through one of said circuit breakers.

Description

Power supply circuit and electronic equipment Technical Field The present application relates to the field of power electronics, and in particular, to a power supply circuit and an electronic device. Background In industrial automation or industrial equipment, a switching power supply is typically required to power additional loads such as sensors or actuators while powering a controller. To reduce downtime and fault location, the power paths are protected separately. Standard miniature circuit breakers are an economical solution to the protection circuit. They can be tripped electromagnetically or thermally by bimetal, and once a load fails, only the failed load will be disconnected and other loads can still continue to operate without interruption. Miniature circuit breakers have a wide variety of triggering characteristics. In an industrial environment, the trip current requirement of a commonly used miniature circuit breaker is 3-10 times of the rated current. However, the output current capability of the switching power supply can limit the fault current flowing through the miniature circuit breaker, and if the output current capacity of the switching power supply powered by the front stage is limited, even if a certain branch fault short circuit exists in the output, the short circuit current is insufficient to trigger the miniature circuit breaker to trip. Causing malfunction and paralysis of the entire power supply system. Disclosure of Invention The application mainly provides a power supply circuit and electronic equipment, wherein the power supply circuit can boost short-circuit current, so that the short-circuit current can trigger a miniature circuit breaker to trip. In order to solve the technical problems, the first technical scheme adopted by the application is to provide a power circuit, wherein the power circuit is connected with a load through a circuit breaker, and the power circuit comprises: The power supply circuit includes: The sampling unit is used for sampling the electrical parameters of the load; the overcurrent control unit is connected with the sampling unit and is used for determining the state of the load according to the electrical parameter, responding to the abnormal state of the load and outputting a first overcurrent control signal; and the output current limiting unit is connected with the overcurrent control unit and the sampling unit, responds to the first overcurrent control signal and generates a first threshold value parameter matched with the tripping parameter of the circuit breaker, and the electric parameter is enabled to follow the first threshold value parameter so as to ensure that the circuit breaker is disconnected with a load based on the electric parameter. In an embodiment, the first over-flow control signal includes a hold state and a change state, the output current limiting unit generates a first threshold parameter in response to the hold state of the first over-flow control signal, and generates a second threshold parameter in response to the change state of the first over-flow control signal, the first threshold parameter being greater than the second threshold parameter. In one embodiment, the duration of the hold state of the first over-current control signal is greater than the delay time of the circuit breaker trip. In one embodiment, the output current limiting unit includes: a threshold providing unit connected to the over-flow control unit for generating a first threshold parameter and a second threshold parameter based on the first over-flow control signal; The first operational amplifier unit is connected with the sampling unit and the threshold providing unit and is used for outputting a first control signal according to the electrical parameter and the first threshold parameter or the second threshold parameter. In one embodiment, the threshold providing unit comprises a threshold control unit, a first threshold providing unit and a second threshold providing unit, wherein the threshold control unit is connected with the overcurrent control unit, the first threshold providing unit is connected with the second threshold providing unit and the threshold control unit, and the second threshold providing unit is connected with the reference voltage; in response to the hold state of the first overcurrent control signal, the threshold control unit controls the first threshold providing unit to generate a first threshold parameter based on the reference voltage, and In response to the changing state of the first overcurrent control signal, the threshold control unit controls the first threshold providing unit and the second threshold providing unit to generate the second threshold parameter based on the reference voltage and the first overcurrent control signal in common. In an embodiment, the threshold control unit comprises: the anode of the first diode is connected with the overcurrent control unit, and the cathode of the first diode is conn