Outlet loop control device of standby protection device and self-checking method

Abstract

The invention discloses an outlet loop control device of a standby protection device and a self-checking method, the outlet loop control device comprises a double-CPU outlet starting circuit and an outlet starting self-checking circuit, the double-CPU outlet starting circuit adopts a starting and tripping series control logic for driving the outlet starting self-checking circuit to start when a fault is judged to occur; the outlet starting self-checking circuit is used for conducting outlet loop breakdown self-checking, starting power source self-checking and outlet loop disconnection self-checking. According to the strategy standby device, the starting and tripping series control logic controlled by double CPUs is adopted, when the starting CPU and the protection CPU meet protection logic judgment at the same time, outlet tripping can be achieved, outlet tripping is controlled after outlet starting self-inspection is passed, and the reliability of the strategy standby device is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of relay protection of a backup protection device, and in particular to an outlet circuit control device and a self-checking method of the backup protection device. Background Art

[0002] With the continuous advancement of the standardized design of domestic backup protection devices, the standardization of backup protection devices is getting higher and higher, and at the same time, higher requirements are put forward for the reliability, versatility and configurability of the devices. The reliability of the protection device is not only to ensure that the device will not fail to export when any single component hardware fails, but also to put forward higher reliability requirements in terms of software.

[0003] Existing backup protection devices often adopt a single-board dual-CPU design, and the startup CPU and protection CPU each have independent on-chip memory, Flash and ADC modules. The two systems work in parallel, respectively performing data acquisition and logical judgment. The export circuit is controlled by the startup CPU and the protection CPU, receives the opening and closing commands and sends them to the circuit breaker to implement the opening and closing commands of the circuit breaker. In the existing export circuit design, either the export circuit has no self-check design, and cannot alarm when a short circuit or short circuit occurs in the circuit, or the self-check is not comprehensive enough, and only considers the short circuit and open circuit abnormalities of the export circuit. Summary of the invention

[0004] The purpose of the present invention is to provide an export circuit control device and a self-test method for a backup protection device, which adopts a series control logic of starting and tripping controlled by dual CPUs. The export can only be carried out when the starting CPU and the protection CPU simultaneously meet the conditions judged by the protection logic, and the export tripping is controlled after the export start-up self-test passes, which greatly improves the reliability of the strategic backup device.

[0005] In order to achieve the above object, the scheme of the present invention is:

[0006] On the one hand, the present application provides an export circuit control device of a backup protection device, comprising:

[0007] Dual CPU outlet start-up circuit and outlet start-up self-check circuit. The dual CPU outlet start-up circuit adopts the series control logic of start-up plus tripping to drive the outlet start-up self-check circuit to start when a fault is determined;

[0008] The outlet startup self-test circuit is used to perform outlet circuit breakdown self-test, startup power supply self-test and outlet circuit disconnection self-test.

[0009] In some specific embodiments, the dual CPU exit startup circuit includes a startup drive module and a protection drive module connected in series, the startup drive module is connected to the startup power supply, the protection drive module is connected to the startup self-test circuit, the startup drive module is used to drive the startup switch to start when the startup CPU determines that a fault has occurred, and the protection drive module is used to drive the protection switch to start when the protection CPU determines that a fault has occurred. When the startup switch and the protection switch are both started, the exit startup self-test circuit is driven to start.

[0010] In some specific embodiments, the startup drive module includes a startup CPU, a first drive optocoupler OP1, a transistor Q1 and a startup switch RL1, the light-emitting side of the first drive optocoupler OP1 is connected to the startup CPU, the receiving side of the first drive optocoupler OP1 is respectively connected to 24VCC and the base of the transistor Q1, the emitter of the transistor Q1 is grounded, and the collector is connected to the access end of the startup switch, the power input end of the startup switch is connected to 24VCC, the switch end of the startup switch is connected to 24VCC, and the output end is connected to the switch end of the protection switch.

[0011] In some specific embodiments, the protection drive module includes a protection CPU, a second drive optocoupler OP2, a transistor Q2 and a protection switch RL2, the light-emitting side of the second drive optocoupler OP2 is connected to the protection CPU, the receiving side of the second drive optocoupler OP2 is respectively connected to 24VCC and the base of the transistor Q2, the emitter of the transistor Q2 is grounded, and the collector is connected to the access end of the protection switch, the power input end of the protection switch is connected to 24VCC, the switch end of the protection switch is connected to the output end of the start switch, and the output end of the protection switch outputs a 24V_QD start power signal to the outlet start self-test circuit.

[0012] In some specific embodiments, the outlet start self-test circuit includes a first detection optocoupler, a second detection optocoupler, and a third detection optocoupler;

[0013] The light-emitting side of the first detection optical coupler is respectively connected to the output end and the ground end of the protection switch, and the receiving side of the first detection optical coupler is respectively connected to the ground and the output port of the output start self-test circuit;

[0014] The light-emitting side of the second detection optocoupler is respectively connected to 24VCC and the output end of the protection switch, the grounded end of the first detection optocoupler is connected to the 24VCC end of the second detection optocoupler, and the receiving side of the second detection optocoupler is respectively connected to the ground and the output port of the output start self-test circuit;

[0015] The light-emitting side of the third detection optocoupler is grounded and outputs an OUT output signal, and both ends of the receiving side of the third detection optocoupler are grounded and connected to the light-emitting side of the second detection optocoupler connected to the output end of the protection switch.

[0016] In some specific embodiments, a capacitor is connected between the two ends of the receiving side of the third detection optocoupler, and the ground end of the receiving side of the third detection optocoupler is connected to 24VGND through a diode D3 and a one-way valve, and a diode D4 is connected to both ends of the one-way valve.

[0017] In a second aspect, the present application provides an outlet circuit self-checking method for a backup protection device, which uses the outlet circuit control device of the backup protection device described in the first aspect to perform self-checking, specifically comprising the following steps:

[0018] S1, the startup CPU and the protection CPU respectively perform protection logic judgment. When both the startup CPU and the protection CPU determine that a fault occurs, the startup CPU outputs a drive enable signal to drive the startup switch to turn on, and the protection CPU outputs a drive enable signal to drive the protection switch to turn on, and the protection switch outputs a 24V_QD startup power supply signal;

[0019] S2, the outlet startup self-check circuit performs self-check after receiving the 24V_QD startup power supply signal, and issues an alarm when an abnormality is detected. When no abnormality is detected, the output OUT outlet signal controls the outlet circuit to take protective export action.

[0020] In some specific implementations, the outlet starts the self-test circuit to perform self-test including loop breakdown self-test, and the specific process is:

[0021] Only the light-emitting side of the first detection optocoupler is grounded and not connected to the output end of the protection switch. The two ends of the light-emitting side of the second detection optocoupler are respectively connected to 24VCC and the receiving side of the third detection optocoupler, and no 24V_QD startup power supply signal and OUT output signal are given;

[0022] When the third detection optocoupler works normally, the BH_START_RET signal outputted from the output port of the exit start self-test circuit remains at a high level;

[0023] When the third detection optocoupler fails to break down, the light-emitting side of the second detection optocoupler and the receiving side of the third detection optocoupler are grounded to form a power-on loop, the second detection optocoupler is turned on, and the BH_START_RET signal output by the output port of the outlet start self-test circuit becomes a low level, and an outlet loop breakdown alarm is issued.

[0024] In some specific implementations, the outlet starts the self-test circuit to perform self-test, including starting the power supply self-test, and the specific process is:

[0025] The two ends of the first detection optocoupler light-emitting side are grounded and connected to the output end of the protection switch. The two ends of the second detection optocoupler light-emitting side are connected to 24VCC and the output end of the protection switch respectively. The third detection optocoupler light-emitting side is only grounded, no OUT output signal is given, and only 24V_QD start power signal is given;

[0026] When the 24V_QD startup power supply signal connected to the first detection optocoupler and the second detection optocoupler is normal, the first detection optocoupler is turned on, and the BH_START_RET signal output by the output port of the exit startup self-test circuit is low level;

[0027] When the 24V_QD startup power supply signal connected to the first detection optocoupler and the second detection optocoupler is abnormal, the first detection optocoupler and the second detection optocoupler are both not conducting, and the BH_START_RET signal output by the output port of the exit startup self-test circuit becomes a high level, and a startup power supply abnormality alarm is issued.

[0028] In some specific implementations, the outlet starts the self-checking circuit to perform self-checking including the outlet circuit disconnection self-checking, and the specific process is as follows:

[0029] The light-emitting side of the first detection optocoupler is grounded but not connected to the output end of the protection switch, and the light-emitting side of the second detection optocoupler is connected to 24VCC but not connected to the output end of the protection switch; the two ends of the light-emitting side of the third detection optocoupler are grounded respectively and connected to the first OUT output signal, and then the second OUT output signal is output after a delay, and the 24V_QD startup power supply signal is not given;

[0030] After the first OUT output signal is connected, the second detection optocoupler is turned on, and the BH_START_RET signal outputted from the output port of the output start self-test circuit is at a low level;

[0031] If the outlet loop is not disconnected, when the second OUT outlet signal is output, the BH_START_RET signal outputted by the outlet start self-checking circuit output port is high level;

[0032] If the export loop is disconnected, when the second OUT export signal is output, the BH_START_RET signal output by the export start self-test circuit output port disappears and remains at a high level, and a control loop disconnection alarm is issued.

[0033] The present invention has the beneficial effects:

[0034] The present invention adopts the series control logic of starting and tripping controlled by dual CPUs. The export can only be carried out when the starting CPU and the protection CPU simultaneously meet the conditions judged by the protection logic. The export circuit breakdown self-inspection, starting power supply self-inspection and export circuit disconnection self-inspection are carried out through the export starting self-inspection circuit, which greatly improves the reliability of the strategic backup device. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of an outlet circuit control device provided in an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of a dual COU outlet startup circuit provided in an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of an outlet startup self-check circuit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0040] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0041] Additionally, descriptions of well-known structures, functions, and configurations may be omitted for clarity and conciseness.One of ordinary skill in the art will recognize that various changes and modifications may be made to the examples described herein without departing from the spirit and scope of the present disclosure.

[0042] Technologies, methods, and apparatus known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, such technologies, methods, and apparatus should be considered part of the authorization specification.

[0043] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0044] Example 1

[0045] like Figure 1 As shown, the present application provides an export circuit control device of a backup protection device, comprising:

[0046] Dual CPU outlet start-up circuit and outlet start-up self-check circuit. The dual CPU outlet start-up circuit adopts the series control logic of start-up plus tripping to drive the outlet start-up self-check circuit to start when a fault is determined;

[0047] The outlet startup self-test circuit is used to perform outlet circuit breakdown self-test, startup power supply self-test and outlet circuit disconnection self-test.

[0048] Specifically, the dual CPU exit startup circuit includes a startup drive module and a protection drive module connected in series. The startup drive module is connected to the startup power supply, and the protection drive module is connected to the startup self-test circuit. The startup drive module is used to drive the startup switch to start when the startup CPU determines that a fault has occurred. The protection drive module is used to drive the protection switch to start when the protection CPU determines that a fault has occurred. When the startup switch and the protection switch are both started, the exit startup self-test circuit is driven to start.

[0049] like Figure 2 As shown, the start-up drive module includes a start-up CPU, a first drive optocoupler OP1, a transistor Q1 and a start-up switch RL1. The light-emitting side port 1 of the first drive optocoupler OP1 is connected to the QD_START_P drive signal output by the start-up CPU through a resistor R1, and the port 2 of the first drive optocoupler OP1 is connected to the QD_START_N drive signal output by the start-up CPU; the receiving side port 4 of the first drive optocoupler OP1 is connected to 24VCC, and the port 3 is connected to the base B of the transistor Q1 through a resistor R2, and the base B of the transistor Q1 is connected to the resistor R 3 is grounded to 24VGND, R2 and R3 are connected in series, the emitter E of the transistor Q1 is grounded to 24VGND, the collector C is connected to the access terminal 12 of the starting switch RL1, the power input port 1 of the starting switch RL1 is connected to 24VCC, and a diode D1 is connected in parallel between the access terminal 12 and the power input terminal 1 of the starting switch RL1, the switch terminals 4 and 9 of the starting switch RL1 are connected to 24VCC, the output terminals 5 and 8 are both connected to the switch terminal 9 of the protection switch RL2, the output terminals 3 and 8 of RL1 are suspended, and when the switch terminal is connected to 3 or 8, RL1 is disconnected.

[0050] like Figure 2 As shown, the protection drive module includes a protection CPU, a second drive optocoupler OP2, a transistor Q2 and a protection switch RL2. The light-emitting side port 1 of the second drive optocoupler OP2 is connected to the BH_START_P drive signal output by the protection CPU through a resistor R4, and the port 2 of the second drive optocoupler OP2 is connected to the BH_START_N drive signal output by the protection CPU; the receiving side port 4 of the second drive optocoupler OP2 is connected to 24VCC, the port 3 is connected to the base B of the transistor Q2 through a resistor R5, the emitter E of the transistor Q2 is grounded to 24VGND through a resistor R6, and the collector C is connected to the access terminal 12 of the protection switch RL2, the power input terminal 1 of the protection switch RL2 is connected to 24VCC, and the access terminal 12 and the power input terminal 1 of the protection switch RL2 are connected in parallel with a diode D2, the switch terminal 9 of the protection switch RL2 is connected to the output terminal 8 of the start switch RL1, the output terminals 3, 5, and 8 of RL2 are suspended, and the output terminal 8 of the protection switch RL2 outputs a 24V_QD start power signal to the exit start self-test circuit. In this embodiment, the first driving optical coupler OP1 and the second driving optical coupler OP2 are optical couplers of the OPRC-815S model.

[0051] like Figure 3 As shown, the exit start self-test circuit includes a first detection optocoupler OP1, a second detection optocoupler OP2 and a third detection optocoupler OP3;

[0052] The light-emitting side port 1 of the first detection optocoupler OP1 is connected to the 24V_QD startup power supply signal output by the output terminal 9 of the protection switch RL2, and the port 2 is grounded to 24GND through the resistor R7. The receiving side port 3 of the first detection optocoupler OP1 is grounded to 24GND, and the port 4 is connected to the output terminal of the startup self-test circuit to output the BH_START_RET signal through the resistor R10. One end of the capacitor C1 is grounded, and the other end is connected to the port 4 of the first detection optocoupler OP1. The two ends of the resistor R9 are respectively connected to the port 4 of the first detection optocoupler OP1 and the 3.3VCC power supply. The two ends of the resistor R8 are respectively connected to the port 4 of the first detection optocoupler OP1 and the capacitor C2, and the other end of the capacitor C2 is grounded.

[0053] The light-emitting side port 1 of the second detection optocoupler OP2 is connected to 24VCC through the resistor R8, and the port 1 of the second detection optocoupler OP2 is connected to the port 2 of the first detection optocoupler OP1, the light-emitting side port 2 of the second detection optocoupler OP2 is connected to the 24V_QD start-up power signal output by the output terminal 9 of the protection switch RL2, the receiving side port 4 of the second detection optocoupler OP2 is connected to the port 4 of the first detection optocoupler OP1, and the receiving side port 3 of the second detection optocoupler OP2 is grounded;

[0054] The light-emitting side port 1 of the third detection optocoupler OP3 is connected to or outputs the OUT output signal through the resistor R11, the light-emitting side port 2 of the third detection optocoupler OP3 is grounded, the receiving side port 4 of the third detection optocoupler is connected to the port 2 of the second detection optocoupler OP2, and the receiving side port 3 of the third detection optocoupler is connected to the diode D3 and the one-way valve CXJA in sequence, and then connected to 24VGND; a capacitor C3 is connected between the receiving side port 3 and port 4 of the third detection optocoupler, and a diode D4 is connected between the port 1 and port 16 of the one-way valve CXJA.

[0055] The export circuit control device based on the above backup protection device includes an export start function and a start self-check process, including the following steps:

[0056] S1, the startup CPU and the protection CPU respectively perform protection logic judgment. When both the startup CPU and the protection CPU determine that a fault occurs, the startup CPU outputs a drive enable signal to drive the startup switch to turn on, and the protection CPU outputs a drive enable signal to drive the protection switch to turn on, and the protection switch outputs a 24V_QD startup power supply signal;

[0057] S2, the outlet startup self-check circuit performs self-check after receiving the 24V_QD startup power supply signal, and issues an alarm when an abnormality is detected. When no abnormality is detected, the output OUT outlet signal controls the outlet circuit to take protective export action.

[0058] based on Figure 2 The dual CPU export startup circuit, export startup function principle is:

[0059] The export start function is controlled by the start CPU and the protection CPU in series. The export drive power supply is 24VCC. In normal working state, neither the start CPU nor the protection CPU sends a START enable signal to drive switches RL1 and RL2, that is, there is no voltage difference across switches RL1 and RL2. If the contacts remain disconnected, there is no start power drive export circuit; when a fault occurs, the protection CPU and the start CPU respectively perform protection logic judgment. When the protection CPU and the start CPU both enable the START drive switches RL1 and RL2, a 24V_QD start power signal is output, and the export start self-test circuit obtains a 24V level, driving the export circuit to perform export protection action.

[0060] When a failure occurs, based on Figure 3 The outlet startup self-test circuit is divided into outlet circuit breakdown self-test, startup power supply self-test and outlet circuit disconnection self-test. The working principle of the outlet startup self-test circuit is:

[0061] 1. Circuit breakdown self-test, the specific process is:

[0062] After the export loop control device is powered on, it performs self-test without connecting to the 24V_QD startup power supply signal and the OUT export signal. Only the light-emitting side of the first detection optocoupler is grounded without connecting to the output end of the protection switch. The two ends of the light-emitting side of the second detection optocoupler are connected to 24VCC and the receiving side of the third detection optocoupler respectively.

[0063] When the third detection optical coupler OP3 works normally, the BH_START_RET signal outputted from the output port of the exit start self-test circuit maintains a high level;

[0064] When the third detection optocoupler OP3 breaks down, the light-emitting side of the second detection optocoupler and the receiving side of the third detection optocoupler are grounded to form a Figure 3 In the power-on circuit shown by the arrow, the second detection optocoupler OP2 is turned on, and the BH_START_RET signal output by the output port of the outlet start self-test circuit becomes a low level, and an outlet circuit breakdown alarm is issued at this time.

[0065] 2. Start the power self-test. The specific process is as follows:

[0066] When detecting the 24V_QD start-up power supply signal, no OUT output signal is given, only the 24V_QD start-up power supply signal is given, the two ends of the light-emitting side of the first detection optocoupler are grounded respectively and connected to the output end of the protection switch, and the two ends of the light-emitting side of the second detection optocoupler are connected to 24VCC and the output end of the protection switch respectively; the light-emitting side of the third detection optocoupler is only grounded, no OUT output signal is given, and only the 24V_QD start-up power supply signal is given;

[0067] When the 24V_QD startup power supply signal connected to the first detection optocoupler and the second detection optocoupler is normal, the first detection optocoupler OP1 is turned on, and the BH_START_RET signal output by the output port of the exit startup self-test circuit is low level;

[0068] When the 24V_QD startup power supply signal connected to the first detection optocoupler OP1 and the second detection optocoupler OP2 is abnormal, the first detection optocoupler OP1 and the second detection optocoupler OP2 are both not conducting, and the BH_START_RET signal output by the output port of the exit startup self-test circuit becomes a high level, and a startup power supply abnormality alarm is issued.

[0069] 3. The specific process of self-checking the disconnection of the export circuit is as follows:

[0070] When the detection control loop is disconnected, no 24V_QD startup power signal is given, only OUT signal is given, and the OUT signal returns after a certain delay. The light-emitting side of the first detection optocoupler is grounded but not connected to the output end of the protection switch, and the light-emitting side of the second detection optocoupler is connected to 24VCC but not connected to the output end of the protection switch; the two ends of the light-emitting side of the third detection optocoupler are grounded and connected to the first OUT output signal, and then the second OUT output signal is output after a delay, and no 24V_QD startup power signal is given;

[0071] After the first OUT output signal is connected, the second detection optical coupler OP2 is turned on, and the BH_START_RET signal outputted from the output port of the output start self-test circuit is at a low level;

[0072] If the outlet loop is not broken, when the second OUT outlet signal is output, the BH_START_RET signal output by the outlet start self-check circuit output port is high level; that is, the BH_START_RET level will have a falling edge and a rising edge.

[0073] If the export loop is disconnected, when the second OUT export signal is output, the BH_START_RET signal output by the export start self-test circuit output port disappears and remains at a high level, and a control loop disconnection alarm is issued.

[0074] The hardware system of the strategic standby protection device designed based on the domestic CPU platform adopts a dual CPU architecture design. The device adopts a single-board dual CPU design, and the startup CPU and protection CPU each have independent on-chip memory, Flash and ADC modules. The two systems work in parallel, respectively performing data acquisition and logical judgment. The startup CPU controls the startup switch, and the protection CPU controls the export relay. The export trip can only be performed when the protection logic of the startup CPU and the protection CPU are satisfied, which greatly improves the reliability of the strategic standby device. The protection export loop control adopts the "start + trip" series control logic. The startup CPU and the protection CPU act at the same time, and the device will act at the export. The export loop controlled by the protection CPU outputs the OUT control signal through the export expansion bus, and then is isolated by the Darlington optocoupler to drive the export relay to act.

[0075] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. According to the technical essence of the present invention, within the spirit and principles of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the present invention.

Claims

1. The output circuit control device of the backup protection device is characterized in that: include: Dual CPU outlet start-up circuit and outlet start-up self-check circuit. The dual CPU outlet start-up circuit adopts the series control logic of start-up plus tripping to drive the outlet start-up self-check circuit to start when a fault is determined; The outlet startup self-test circuit is used to perform outlet circuit breakdown self-test, startup power supply self-test and outlet circuit disconnection self-test.

2. The outlet circuit control device of the backup protection device according to claim 1, characterized in that: The dual CPU exit startup circuit includes a startup drive module and a protection drive module connected in series. The startup drive module is connected to the startup power supply, and the protection drive module is connected to the startup self-test circuit. The startup drive module is used to drive the startup switch to start when the startup CPU determines that a fault has occurred. The protection drive module is used to drive the protection switch to start when the protection CPU determines that a fault has occurred. When the startup switch and the protection switch are both started, the exit startup self-test circuit is driven to start.

3. The outlet circuit control device of the backup protection device according to claim 2, characterized in that: The startup drive module includes a startup CPU, a first drive optocoupler OP1, a transistor Q1 and a startup switch RL1. The light-emitting side of the first drive optocoupler OP1 is connected to the startup CPU, the receiving side of the first drive optocoupler OP1 is respectively connected to 24VCC and the base of the transistor Q1, the emitter of the transistor Q1 is grounded, and the collector is connected to the access end of the startup switch, the power input end of the startup switch is connected to 24VCC, the switch end of the startup switch is connected to 24VCC, and the output end is connected to the switch end of the protection switch.

4. The outlet circuit control device of the backup protection device according to claim 2, characterized in that: The protection drive module includes a protection CPU, a second drive optocoupler OP2, a transistor Q2 and a protection switch RL2. The light-emitting side of the second drive optocoupler OP2 is connected to the protection CPU, the receiving side of the second drive optocoupler OP2 is respectively connected to 24VCC and the base of the transistor Q2, the emitter of the transistor Q2 is grounded, and the collector is connected to the access end of the protection switch, the power input end of the protection switch is connected to 24VCC, the switch end of the protection switch is connected to the output end of the start switch, and the output end of the protection switch outputs a 24V_QD start power signal to the outlet start self-test circuit.

5. The export circuit control device of the backup protection device according to claim 2, characterized in that: The exit start self-check circuit includes a first detection optocoupler, a second detection optocoupler and a third detection optocoupler; The light-emitting side of the first detection optical coupler is respectively connected to the output end and the ground end of the protection switch, and the receiving side of the first detection optical coupler is respectively connected to the ground and the output port of the output start self-test circuit; The light-emitting side of the second detection optocoupler is respectively connected to 24VCC and the output end of the protection switch, the grounded end of the first detection optocoupler is connected to the 24VCC end of the second detection optocoupler, and the receiving side of the second detection optocoupler is respectively connected to the ground and the output port of the output start self-test circuit; The light-emitting side of the third detection optocoupler is grounded and outputs an OUT output signal, and both ends of the receiving side of the third detection optocoupler are grounded and connected to the light-emitting side of the second detection optocoupler connected to the output end of the protection switch.

6. The export circuit control device of the backup protection device according to claim 5, characterized in that: A capacitor is connected between the two ends of the receiving side of the third detection optocoupler, and the ground end of the receiving side of the third detection optocoupler is connected to 24VGND through a diode D3 and a one-way valve respectively, and a diode D4 is connected to both ends of the one-way valve.

7. A method for self-checking an outlet circuit of a backup protection device, using the outlet circuit control device of the backup protection device as claimed in claim 5 to perform self-checking, characterized in that: The specific steps include: S1, the startup CPU and the protection CPU respectively perform protection logic judgment. When both the startup CPU and the protection CPU determine that a fault occurs, the startup CPU outputs a drive enable signal to drive the startup switch to turn on, and the protection CPU outputs a drive enable signal to drive the protection switch to turn on, and the protection switch outputs a 24V_QD startup power supply signal; S2, the outlet startup self-check circuit performs self-check after receiving the 24V_QD startup power supply signal, and issues an alarm when an abnormality is detected. When no abnormality is detected, the output OUT outlet signal controls the outlet circuit to take protective export action.

8. The method for self-checking the outlet circuit of the backup protection device according to claim 7, characterized in that: The exit starts the self-test circuit to perform self-test including circuit breakdown self-test. The specific process is as follows: Only the light-emitting side of the first detection optocoupler is grounded and not connected to the output end of the protection switch. The two ends of the light-emitting side of the second detection optocoupler are respectively connected to 24VCC and the receiving side of the third detection optocoupler, and no 24V_QD startup power supply signal and OUT output signal are given; When the third detection optocoupler works normally, the BH_START_RET signal outputted from the output port of the exit start self-test circuit remains at a high level; When the third detection optocoupler fails to break down, the light-emitting side of the second detection optocoupler and the receiving side of the third detection optocoupler are grounded to form a power-on loop, the second detection optocoupler is turned on, and the BH_START_RET signal output by the output port of the outlet start self-test circuit becomes a low level, and an outlet loop breakdown alarm is issued.

9. The method for self-checking the outlet circuit of the backup protection device according to claim 7, characterized in that: The self-test of the exit startup self-test circuit includes starting the power supply self-test. The specific process is as follows: The two ends of the first detection optocoupler light-emitting side are grounded and connected to the output end of the protection switch. The two ends of the second detection optocoupler light-emitting side are connected to 24VCC and the output end of the protection switch respectively. The third detection optocoupler light-emitting side is only grounded, no OUT output signal is given, and only 24V_QD start power signal is given; When the 24V_QD startup power supply signal connected to the first detection optocoupler and the second detection optocoupler is normal, the first detection optocoupler is turned on, and the BH_START_RET signal output by the output port of the exit startup self-test circuit is low level; When the 24V_QD startup power supply signal connected to the first detection optocoupler and the second detection optocoupler is abnormal, the first detection optocoupler and the second detection optocoupler are both not conducting, and the BH_START_RET signal output by the output port of the exit startup self-test circuit becomes a high level, and a startup power supply abnormality alarm is issued.

10. The method for self-checking the outlet circuit of the backup protection device according to claim 7, characterized in that: The outlet starts the self-test circuit to perform self-test, including the outlet circuit disconnection self-test. The specific process is as follows: The light-emitting side of the first detection optocoupler is grounded but not connected to the output end of the protection switch, and the light-emitting side of the second detection optocoupler is connected to 24VCC but not connected to the output end of the protection switch; the two ends of the light-emitting side of the third detection optocoupler are grounded respectively and connected to the first OUT output signal, and then the second OUT output signal is output after a delay, and the 24V_QD startup power supply signal is not given; After the first OUT output signal is connected, the second detection optocoupler is turned on, and the BH_START_RET signal outputted from the output port of the output start self-test circuit is at a low level; If the outlet loop is not disconnected, when the second OUT outlet signal is output, the BH_START_RET signal outputted by the outlet start self-checking circuit output port is high level; If the export loop is disconnected, when the second OUT export signal is output, the BH_START_RET signal output by the export start self-test circuit output port disappears and remains at a high level, and a control loop disconnection alarm is issued.

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