CN220754348U - Bus overcurrent protection circuit, electric equipment and power supply device - Google Patents

Abstract

The application provides a bus overcurrent protection circuit, electric equipment and a power supply device, wherein the bus overcurrent protection circuit comprises a rectification module, an inverter bridge circuit module and an overcurrent protection module, the inverter bridge module is connected with the rectification module in parallel, the overcurrent protection module comprises a first sampling circuit, and the first sampling circuit is connected in series on a bus between the rectification module and the inverter bridge circuit module and is used for sampling current passing through the bus and generating sampling voltage; a voltage detection unit configured to compare the sampling voltage with a predetermined threshold value, and output a first level signal when it is determined that the current on the bus is flowing; and the micro control unit is used for receiving the first level signal and controlling the turn-off of the power tube in the inverter bridge circuit module according to the first level signal. The method and the device can realize overcurrent protection on the bus current.

Description

Bus overcurrent protection circuit, electric equipment and power supply device

Technical Field

The application relates to the technical field of overcurrent protection circuits, in particular to a bus overcurrent protection circuit, electric equipment and a power supply device.

Background

The prior art generally provides protection circuits for power transistors, motor phase currents, etc. in the drive, but lacks bus current monitoring and protection.

Disclosure of Invention

An object of the embodiment of the application is to provide a bus overcurrent protection circuit, electric equipment and a power supply device, which can carry out overcurrent protection on bus current.

In order to solve the technical problem, the embodiment of the application provides a bus overcurrent protection circuit, the bus overcurrent protection circuit includes rectifier module, inverter bridge circuit module and overcurrent protection module, the inverter bridge module with the rectifier module connects in parallel, overcurrent protection module includes: the first sampling circuit is connected in series on a bus between the rectifying module and the inverter bridge circuit module and is used for sampling current passing through the bus and generating sampling voltage; a voltage detection unit configured to compare the sampling voltage with a predetermined threshold value, and output a first level signal when it is determined that the current on the bus line is over-current; and the micro control unit is used for receiving the first level signal and controlling the turn-off of the power tube in the inverter bridge circuit module according to the first level signal.

The voltage detection unit further comprises an amplifying and filtering unit, a comparator unit and an isolator unit which are connected in sequence, wherein the amplifying and filtering unit is connected with the first sampling circuit in parallel, and the isolator unit is connected with the micro-control unit.

The bus protection circuit further comprises a driving circuit, and the driving circuit is respectively connected with the micro control unit and the control end of each power tube in the inverter bridge circuit module.

The inverter bridge circuit module further comprises a first half-bridge unit, a second half-bridge unit and a third half-bridge unit which are connected in parallel, wherein the first half-bridge unit comprises a first power tube and a second power tube which are connected in series, the second half-bridge unit comprises a third power tube and a fourth power tube which are connected in series, the third half-bridge unit comprises a fifth power tube and a sixth power tube which are connected in series, and the control end of each power tube is respectively connected with the driving circuit.

The bus protection circuit further comprises a second sampling circuit and a third sampling circuit, wherein the second sampling circuit is connected in series between the first half-bridge unit and the motor, and the second sampling circuit is connected in series between the second half-bridge unit and the motor.

The bus protection circuit further comprises an isolation current detection circuit, the isolation current detection circuit is connected with the micro control unit, and the isolation current detection circuit is configured to detect voltages on the second sampling circuit and the third sampling circuit respectively so as to determine whether phase current of the motor is over-current or not.

The rectifying module further comprises a first rectifying diode, a second rectifying diode, a third rectifying diode and a fourth rectifying diode; the positive electrode of the first rectifying diode, the negative electrode of the third rectifying diode is connected with a first alternating current input end, the positive electrode of the second rectifying diode and the negative electrode of the fourth rectifying diode are connected with a second alternating current input end, the negative electrode of the first rectifying diode is connected with a first direct current output end, and the positive electrode of the third rectifying tube and the positive electrode of the fourth rectifying diode are connected with a second alternating current input end.

The bus protection circuit further comprises bus capacitors connected in parallel to two sides of the rectifying module, wherein the bus capacitors are used for storing energy, filtering the rectified bus and supplying power to the later-stage circuit.

In order to solve the technical problem, the embodiment of the application also provides electric equipment, which comprises any bus overcurrent protection circuit.

In order to solve the technical problem, an embodiment of the present application further provides a power supply device, where the power supply device includes any one of the bus overcurrent protection circuits described above.

Compared with the prior art, the embodiment of the application has the following main beneficial effects:

the utility model provides a busbar overcurrent protection circuit, consumer and power supply unit sets up the overcurrent protection module of busbar in low limit busbar department, samples the electric current through the busbar through the first sampling circuit in the overcurrent protection module to generate sampling voltage, compare by voltage detection unit and predetermined threshold again, when confirming the electric current on the busbar and overflows, output first level signal to micro-control unit, thereby control the shutoff of power tube in the contravariant bridge circuit module, realize the overcurrent protection to busbar current.

Drawings

For a clearer description of the solution in the present application, a brief description will be given below of the drawings that are needed in the description of the embodiments of the present application, it being obvious that the drawings in the following description are some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

Fig. 1 is a schematic structural diagram of a first embodiment of a bus bar overcurrent protection circuit of the present application;

fig. 2 is a schematic structural diagram of a second embodiment of the bus bar overcurrent protection circuit of the present application.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the applications herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In order to better understand the technical solutions of the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of a bus overcurrent protection circuit according to the present application, and as shown in fig. 1, a bus overcurrent protection circuit 100 provided in the present application further includes a rectifying module 110, an inverter bridge circuit module 120, and an overcurrent protection module 130.

The rectifying module 110 is connected to the first AC input end and the second AC input end, and is configured to convert an AC voltage into a dc voltage, where the AC power of 220V in the present application is changed into the dc voltage of about 310VDC after passing through the rectifying module 110 (D1, D2, D3, and D4 in the figure).

Further, the rectifying module 110 in the present application further includes a first rectifying diode D1, a second rectifying diode D2, a third rectifying diode D3, and a fourth rectifying diode D4.

The positive electrode of the first rectifying diode D1, the negative electrode of the third rectifying diode D3 is connected with the first ac input end, the positive electrode of the second rectifying diode D2 and the negative electrode of the fourth rectifying diode D4 are connected with the second ac input end, the negative electrode of the first rectifying diode D1, the negative electrode of the second rectifying diode D2 is connected with the first dc output end, and the positive electrode of the third rectifying diode D3 and the positive electrode of the fourth rectifying diode D4 are connected with the second ac input end.

It can be understood that the line overcurrent protection circuit 100 further includes a bus capacitor C1 connected in parallel to two sides of the rectifying module, where the bus capacitor C1 is used for storing energy, filtering the rectified bus and supplying power to the subsequent circuit.

Further, the inverter bridge circuit module 120 further includes a first half-bridge unit 121, a second half-bridge unit 122, and a third half-bridge unit 123 connected in parallel. The first half-bridge unit 121 includes a first power tube Q1 and a second power tube Q2 connected in series, the second half-bridge unit 122 includes a third power tube Q3 and a fourth power tube Q4 connected in series, the third half-bridge unit 123 includes a fifth power tube Q5 and a sixth power tube Q6 connected in series, and control ends of the power tubes are respectively connected with the driving circuit. In the present application, the first power tube Q1, the second power tube Q2, the third power tube Q3, the fourth power tube Q4, the fifth power tube Q5 and the sixth power tube Q6 form a three-phase inverter bridge circuit, and the power tubes in the present application may include, but are not limited to, insulated Gate Bipolar Transistors (IGBTs), and may also be other types of power tubes in other embodiments, which are not specifically limited herein.

It can be understood that the current flows from the positive electrode of the bus through the inverter bridge circuit module 120 to the negative electrode of the bus after passing through the rectifying module 110, and the inverter bridge circuit module 120 further inverts the direct current passing through the rectifying module 110 into alternating current to drive the permanent magnet synchronous motor.

Optionally, the overcurrent protection module 130 further includes a first sampling circuit 131, a voltage detection unit 132, and a micro control unit 133.

The first sampling circuit 131 is connected in series to a bus (i.e., a negative end of the bus) between the rectifying module 110 and the inverter bridge circuit module 120, and is configured to sample a current passing through the bus and generate a sampling voltage. Alternatively, the first sampling circuit 131 may be implemented by using a sampling resistor, or may be implemented by using a hall sensor, which is not specifically limited herein. In the embodiment of the present application, the principle of the bus protection circuit is described in detail taking the first sampling circuit 131 as the sampling resistor as an example.

It can be understood that when the current flows through the first sampling circuit 131, that is, the first sampling resistor R1, a voltage is generated across the first sampling resistor R1, and the magnitude of the current flowing through the first sampling resistor R1 can be known by detecting the voltage across the first sampling resistor R1. Since the current flowing through the bus is generally larger, the resistance of the first sampling resistor R1 needs to be smaller, otherwise, the larger the current flowing through the first sampling resistor R1 is, the larger the power consumption on the first sampling resistor R1 is, the larger the power consumption is, the more serious the heat is generated, and meanwhile the efficiency of the whole driver is affected. In addition, the more serious the heating on the first sampling resistor R1, the larger the resistance change of the first sampling resistor R1 is, and the situation of false triggering or larger triggering current is easily caused. However, if the first sampling resistor R1 is selected to be small, the voltage on the first sampling resistor R1 will be small and will be easily interfered by noise and the power tube in the inverter bridge module 120 to cause malfunction, so that the front stage needs to perform filtering to filter the noise and the interference of the power tube in the inverter bridge module 120.

Accordingly, the voltage detecting unit 132 in this application further includes an amplifying filter unit 1321, a comparator unit 1322, and an isolation unit 1323 connected in sequence. Wherein the amplifying and filtering unit 1321 is connected in parallel to both sides of the first sampling circuit 131, and the isolator unit 1323 is connected to the micro control unit 133. It can be understood that when a current flows through the first sampling circuit 131 (the first sampling resistor R1), a voltage v=i×r is generated across the first sampling resistor R1, and the amplifying and filtering unit 1321 is configured to amplify and filter the voltage V across the first sampling resistor R1, so as to eliminate noise and filter interference caused by a power tube in the inverter bridge circuit module.

The comparator unit 1322 is configured to compare the amplified and filtered sampled voltage with a predetermined threshold value, so as to determine whether the current on the bus line is over-current. Specifically, the comparator unit 1322 in the present application may employ a hysteresis comparator, where the hysteresis comparator has two threshold voltages, and the output jumps only once when the input changes in one direction. When the input is changed from large to small, the input corresponds to small threshold voltage, when the input is changed from small to large, the output keeps the original output between the two threshold voltages. Once the output state is switched, the value of the output voltage will be stable as long as the disturbance around the value of the jump voltage does not exceed the value of deltau. In the hysteresis comparator operational amplifier, the positive phase voltage is larger than the negative phase voltage operational amplifier to output high level, and conversely, the negative phase voltage is larger than the positive phase voltage operational amplifier to output low level. Alternatively, in this application, whether the sampling current flowing through the bus bar is excessive is determined by comparing the amplified and filtered sampling voltage with a predetermined threshold value, and if it is determined that the sampling current flowing through the bus bar exceeds the threshold value, the comparator unit 1322 is triggered to output a first level signal (in this application, a low level) so that the isolator unit 1323 is turned on, and the isolator unit 1323 outputs the first level signal to the micro control unit 133 (MCU) after being turned on. Alternatively, the isolator unit 1323 may be an optocoupler, and the micro control unit 133 is a low voltage device, so that the inverter bridge circuit module 120 is rectified by high voltage, and therefore has to be isolated.

Further, the micro control unit 133 receives the first level signal and controls the turn-off of the power tube in the inverter bridge circuit module 120 according to the first level signal. Specifically, in the present application, the micro control unit 133 is connected to the control end of each power tube in the inverter bridge circuit module 120 through the driving circuit 140, and the micro control unit 133 sends a pulse width modulation wave (PWM wave) to the driving circuit 140, and then the driving circuit 140 controls the on and off of the power tube, so as to realize the overcurrent protection of the bus current. The driving circuit 140 in the application mainly amplifies the power output by the pulse of the micro control unit 133 so as to achieve the purpose of driving the IGBT power device, and plays a vital role on the premise of ensuring the reliable, stable and safe work of the IGBT device.

In the above embodiment, the over-current protection module of the bus is disposed at the low-side bus, the current passing through the bus is sampled by the first sampling circuit in the over-current protection module, the sampled voltage is generated, the voltage detection unit and the predetermined threshold value are compared, and when the current over-current on the bus is determined, the first level signal is output to the micro control unit, so that the power tube in the inverter bridge circuit module is controlled to be turned off, and the over-current protection of the bus current is realized.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a second embodiment of a bus overcurrent protection circuit of the present application, and it can be understood that this embodiment is a further extension of the first embodiment, and is different in that in this embodiment of the present application, the second sampling circuit, the third sampling circuit, and the isolated current detection circuit are further included, so as to implement overcurrent protection on a phase current of a motor, and the same points are not repeated, as in fig. 2:

the bus overcurrent protection circuit 200 provided herein includes a rectifying module 210, an inverter bridge circuit module 220, and an overcurrent protection module 230.

The rectifying module 210 is connected to the first AC input terminal 1 and the second AC input terminal 2, respectively, and is configured to convert an AC voltage into a dc voltage, where the AC power of 220V in the present application is changed into a dc voltage of about 310VDC after passing through the rectifying module 210 (D1, D2, D3, and D4 in the figure).

Further, the rectifying module 210 in the present application further includes a first rectifying diode D1, a second rectifying diode D2, a third rectifying diode D3, and a fourth rectifying diode D4.

The positive electrode of the first rectifying diode D1, the negative electrode of the third rectifying diode D3 is connected with the first ac input end 1, the positive electrode of the second rectifying diode D2 and the negative electrode of the fourth rectifying diode D4 are connected with the second ac input end 2, the negative electrode of the first rectifying diode D1, the negative electrode of the second rectifying diode D2 is connected with the first dc output end 3, and the positive electrode of the third rectifying diode D3 and the positive electrode of the fourth rectifying diode D4 are connected with the second ac input end 4.

It can be understood that the line overcurrent protection circuit 200 further includes a bus capacitor C1 connected in parallel to two sides of the rectifying module, where the bus capacitor C1 is used for storing energy, filtering the rectified bus and supplying power to the subsequent circuit.

Further, the inverter bridge circuit module 220 further includes a first half-bridge unit 221, a second half-bridge unit 222, and a third half-bridge unit 223 connected in parallel. The first half-bridge unit 221 includes a first power tube Q1 and a second power tube Q2 connected in series, the second half-bridge unit 222 includes a third power tube Q3 and a fourth power tube Q4 connected in series, the third half-bridge unit 223 includes a fifth power tube Q5 and a sixth power tube Q6 connected in series, and control ends of the power tubes are respectively connected with the driving circuit. In this application, the first power tube Q1, the second power tube Q2, the third power tube Q3, the fourth power tube Q4, the fifth power tube Q5 and the sixth power tube Q6 form a three-phase inverter bridge circuit, and in this application, the power tubes may include, but are not limited to, insulated Gate Bipolar Transistors (IGBTs), and in other embodiments may also be other types of transistors, which are not specifically limited herein.

It can be understood that the current flows from the positive electrode of the bus through the inverter bridge circuit module 220 to the negative electrode of the bus after passing through the rectifying module 210, and the inverter bridge circuit module 220 further inverts the direct current passing through the rectifying module 210 into alternating current.

Optionally, the overcurrent protection module 230 further includes a first sampling circuit 231, a voltage detection unit 232, and a micro control unit 233. The first sampling circuit 231 is connected in series to a bus (i.e., a negative end of the bus) between the rectifying module 210 and the inverter bridge circuit module 220, and is configured to sample a current passing through the bus and generate a sampling voltage. Alternatively, the first sampling circuit 231 may be implemented by using a sampling resistor, or may be implemented by using a hall sensor, which is not specifically limited herein.

The voltage detection unit 232 in this application further includes an amplifying filter unit 2321, a comparator unit 2322, and an isolation unit 2323 connected in sequence. The amplifying and filtering unit 2321 is connected to two sides of the first sampling circuit 231 in parallel, and the isolator unit 2323 is connected to the micro control unit 233. The amplifying and filtering unit 2321 is configured to amplify and filter the voltage V on the first sampling resistor R1, remove noise, and filter interference caused by a power tube in the inverter bridge circuit module. The comparator unit 2322 is configured to compare the amplified and filtered sampled voltage with a predetermined threshold value, so as to determine whether the current on the bus line is over-flowing.

Further, the micro control unit 233 receives the first level signal and controls the turn-off of the power transistor in the inverter bridge circuit module 220 according to the first level signal. Specifically, in the present application, the micro control unit 233 is connected to the control end of each power tube in the inverter bridge circuit module 220 through the driving circuit 240, and the micro control unit 233 sends a pulse width modulation wave (PWM wave) to the driving circuit 240, and then the driving circuit 240 controls the on and off of the power tube, so as to implement the over-current protection for the bus current.

Further, the bus protection circuit 200 further includes a second sampling circuit 201 and a third sampling circuit 202, where the second sampling circuit 201 is connected in series between the first half-bridge unit 221 and the motor M, and the third sampling circuit 202 is connected in series between the second half-bridge unit 222 and the motor M. Alternatively, the second sampling circuit 201 and the third sampling circuit 202 may be implemented by using sampling resistors, or may be implemented by using hall sensors, which are not limited herein. In the embodiment of the present application, the protection of the motor phase current is described in detail by taking the second sampling circuit 201 and the third sampling circuit 202 as sampling resistors.

Further, the bus protection circuit 200 further includes an isolation current detection circuit 203, where the isolation current detection circuit 203 is connected to the micro control unit 233, and the isolation current detection circuit 203 is configured to detect voltages on the second sampling circuit 201 (i.e., the second sampling resistor R2) and the third sampling circuit 202 (i.e., the third sampling resistor R3), respectively, to determine whether the phase current of the motor M is over-current.

Specifically, the second sampling circuit 201 is used for sampling the U-phase current of the motor M, and the third sampling circuit 202 is used for sampling the V-phase current of the motor M. Since the sum of three-phase current of the motor M is equal to zero, the W-phase current of the motor M can be calculated by knowing the U-phase current and the V-phase current of the motor. The difference between this embodiment and the first embodiment is that the first sampling circuit 231 does not send the current value to the ADC sampling chip after sampling, and directly sends the digital signal to the micro control unit 233 after comparing with the pure hardware circuit. The second sampling circuit 201 and the third sampling circuit 202 need to send the sampled voltages to the ADC sampling chip in the isolation current detection circuit 203 after sampling. The ADC sampling chip collects voltages at two ends of the second sampling circuit 201 and the third sampling circuit 202, converts the voltages into digital values, and sends the digital values to the micro control unit 233, and the micro control unit 233 calculates a phase current of the motor M, and then determines whether the motor M is over-current according to the phase current. In addition, the ADC sampling chip in the isolation current detection circuit 203 may also calculate the power tube overcurrent and the motor M interphase short circuit in the inverter bridge circuit module 220 through the second sampling circuit 201 and the third sampling circuit 202, so as to protect the power tube and the motor M interphase short circuit.

In the above embodiment, the over-current protection module of the bus is set at the low-side bus, the current passing through the bus is sampled by the first sampling circuit in the over-current protection module, the sampled voltage is generated, the voltage detection unit and the preset threshold value are compared, and when the current over-current on the bus is determined, the first level signal is output to the micro control unit so as to control the turn-off of the power tube in the inverter bridge circuit module, so that the over-current protection of the bus current is realized. The protection of overcurrent of motor phase current, overcurrent of power tube and interphase short circuit of motor can also be realized through the second sampling circuit, the third sampling circuit and the isolation current detection circuit.

The embodiment of the present application further provides an electric device, where the electric device includes the bus overcurrent protection circuit in the first embodiment and the second embodiment, and the specific structure and implementation principle of the bus overcurrent protection circuit are detailed in the specific description of the foregoing specification, and are not repeated herein.

The embodiment of the present application further provides a power supply device, which is characterized in that the power supply device includes the bus overcurrent protection circuit in the first embodiment and the second embodiment, and the specific structure and implementation principle of the bus overcurrent protection circuit are detailed in the specific description of the foregoing specification, which is not repeated here.

In the above embodiment, the over-current protection module of the bus is set at the low-side bus, the current passing through the bus is sampled by the first sampling circuit in the over-current protection module, the sampled voltage is generated, the voltage detection unit and the preset threshold value are compared, and when the current over-current on the bus is determined, the first level signal is output to the micro control unit so as to control the turn-off of the power tube in the inverter bridge circuit module, so that the over-current protection of the bus current is realized.

It is apparent that the embodiments described above are only some embodiments of the present application, but not all embodiments, the preferred embodiments of the present application are given in the drawings, but not limiting the patent scope of the present application. This application may be embodied in many different forms, but rather, embodiments are provided in order to provide a more thorough understanding of the present disclosure. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing, or equivalents may be substituted for elements thereof. All equivalent structures made by the specification and the drawings of the application are directly or indirectly applied to other related technical fields, and are also within the protection scope of the application.

Claims (10)

1. The utility model provides a generating line overcurrent protection circuit, its characterized in that, generating line overcurrent protection circuit includes rectifier module, inverter bridge circuit module and overcurrent protection module, inverter bridge circuit module with the rectifier module connects in parallel, overcurrent protection module includes:

the first sampling circuit is connected in series on a bus between the rectifying module and the inverter bridge circuit module and is used for sampling current passing through the bus and generating sampling voltage;

a voltage detection unit configured to compare the sampling voltage with a predetermined threshold value, and output a first level signal when it is determined that the current on the bus line is over-current;

and the micro control unit is used for receiving the first level signal and controlling the turn-off of the power tube in the inverter bridge circuit module according to the first level signal.

2. The bus overcurrent protection circuit according to claim 1, wherein the voltage detection unit further comprises an amplifying filter unit, a comparator unit and an isolator unit which are sequentially connected, the amplifying filter unit is connected in parallel with the first sampling circuit, and the isolator unit is connected with the micro control unit.

3. The bus bar overcurrent protection circuit of claim 2, further comprising a drive circuit connected to the micro control unit and the control end of each of the power tubes in the inverter bridge circuit module, respectively.

4. The bus overcurrent protection circuit according to claim 3, wherein the inverter bridge circuit module further comprises a first half-bridge unit, a second half-bridge unit and a third half-bridge unit which are connected in parallel, the first half-bridge unit comprises a first power tube and a second power tube which are connected in series, the second half-bridge unit comprises a third power tube and a fourth power tube which are connected in series, the third half-bridge unit comprises a fifth power tube and a sixth power tube which are connected in series, and a control end of each power tube is respectively connected with the driving circuit.

5. The bus bar overcurrent protection circuit of claim 4, further comprising a second sampling circuit and a third sampling circuit, the second sampling circuit being connected in series between the first half-bridge unit and the motor, the second sampling circuit being connected in series between the second half-bridge unit and the motor.

6. The bus bar overcurrent protection circuit of claim 5, further comprising an isolation current detection circuit coupled to the micro control unit, the isolation current detection circuit configured to detect voltages on the second sampling circuit and the third sampling circuit, respectively, to determine whether phase currents of the motor are overcurrent.

7. The bus bar overcurrent protection circuit of claim 1, wherein the rectifier module further comprises a first rectifier diode, a second rectifier diode, a third rectifier diode, and a fourth rectifier diode;

the positive electrode of the first rectifying diode, the negative electrode of the third rectifying diode is connected with a first alternating current input end, the positive electrode of the second rectifying diode and the negative electrode of the fourth rectifying diode are connected with a second alternating current input end, the negative electrode of the first rectifying diode is connected with a first direct current output end, and the positive electrode of the third rectifying diode and the positive electrode of the fourth rectifying diode are connected with a second alternating current input end.

8. The bus bar overcurrent protection circuit of claim 1, further comprising bus bar capacitors connected in parallel across the rectifying module, the bus bar capacitors being used to store energy, filter the rectified bus bar and power the subsequent stage circuit.

9. An electrical consumer, characterized in that the electrical consumer comprises a bus overcurrent protection circuit according to any one of claims 1-8.

10. A power supply device, characterized in that it comprises a bus bar overcurrent protection circuit according to any one of claims 1-8.