Circuit breaker

Abstract

An accessory protection module for a circuit breaker, which is used to connect to the accessory of the circuit breaker. The accessory protection module includes a power supply circuit, a single-chip microcomputer circuit, an accessory monitoring circuit, and an accessory control circuit. The accessory monitoring circuit and the accessory control circuit are respectively connected to the single-chip microcomputer circuit. The power supply circuit supplies power to the single-chip microcomputer circuit, the accessory monitoring circuit, and the accessory control circuit. The accessory monitoring circuit is used to connect to the accessory of the circuit breaker and collect the operating voltage of the accessory of the circuit breaker. The single-chip microcomputer circuit judges whether the accessory of the circuit breaker is faulty according to the operating voltage. The accessory control circuit includes a relay connected to the power input terminal of the accessory of the circuit breaker. When the accessory of the circuit breaker is faulty, the single-chip microcomputer circuit cuts off the power supply of the accessory of the circuit breaker through the relay of the accessory control circuit. When the accessory of the circuit breaker is faulty, the power supply of the accessory of the circuit breaker is cut off, preventing the accessory of the circuit breaker from being damaged due to long-term power-on during a fault, especially preventing equipment such as energy storage motors from being damaged due to long-term power-on.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical appliances, and particularly to a protection module for a circuit breaker accessory. Background Art

[0002] When an existing universal circuit breaker is in use, corresponding circuit breaker accessories (such as under-voltage release, shunt release, closing electromagnet, energy storage motor) need to be matched to achieve electrical automation applications. The functions of automatic under-voltage tripping, electric opening, electric closing, and electric energy storage are realized through each circuit breaker accessory.

[0003] However, when a circuit breaker accessory fails, the circuit breaker needs to be turned off first to troubleshoot and replace the faulty circuit breaker accessory. If the circuit breaker accessory is energized for a long time during the fault, it is extremely easy to cause damage. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a protection module for a circuit breaker accessory that can automatically cut off the power supply of the circuit breaker accessory.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A circuit breaker includes an accessory protection module. The accessory protection module has an independent protection module housing, is installed in the circuit breaker and connected to the circuit breaker accessory of the circuit breaker. The accessory protection module includes a power supply circuit, a single-chip microcomputer circuit, an accessory monitoring circuit, and an accessory control circuit. The accessory monitoring circuit and the accessory control circuit are respectively connected to the single-chip microcomputer circuit. The power supply circuit supplies power to the single-chip microcomputer circuit, the accessory monitoring circuit, and the accessory control circuit. The accessory monitoring circuit is used to connect to the circuit breaker accessory and collect the working voltage of the circuit breaker accessory. The single-chip microcomputer circuit judges whether the circuit breaker accessory is faulty according to the working voltage. The accessory control circuit includes a relay connected to the power input end of the circuit breaker accessory. When the circuit breaker accessory is faulty, the single-chip microcomputer circuit cuts off the power supply of the circuit breaker accessory through the relay of the accessory control circuit.

[0007] Preferably, the accessory protection module further includes an accessory monitoring and control circuit connected to the single-chip microcomputer circuit. The accessory monitoring and control circuit is used to connect to the circuit breaker accessory and collect the working current of the circuit breaker accessory.

[0008] Preferably, the accessory monitoring and control circuit includes a monitoring resistor connected in series with the circuit breaker accessory, and a voltage amplification circuit connected to both ends of the monitoring resistor. The voltage amplification circuit can amplify the voltage drop across the monitoring resistor and send it to the single-chip microcomputer circuit. The working current of the circuit breaker accessory is calculated through the single-chip microcomputer circuit to judge whether the circuit breaker accessory is working properly.

[0009] Preferably, the accessory control circuit includes a relay K1. One end of the normally closed contact of the relay K1 is connected to the live wire through a circuit breaker accessory, and the other end of the normally closed contact of the relay K1 is connected to the neutral wire through a resistor R53. A diode D8 is connected in parallel across the two ends of the coil of the relay K1. One end of the coil of the relay K1 is connected to a power supply, and the other end of the coil of the relay K1 is connected to the collector of a triode Q1. The emitter of the triode Q1 is grounded, and the base of the triode Q1 is connected to the single-chip microcomputer circuit through a resistor R52.

[0010] Preferably, the voltage amplification circuit includes a first voltage amplification circuit and a second voltage amplification circuit. The first voltage amplification circuit is connected to both ends of a monitoring resistor, and the second voltage amplification circuit is connected to the output end of the first voltage amplification circuit. The voltage drop across both ends of the monitoring resistor is amplified twice by the first voltage amplification circuit and the second voltage amplification circuit and then transmitted to the single-chip microcomputer chip.

[0011] Preferably, the monitoring resistor is a resistor R53. One end of the resistor R53 is connected in series with the relay K1 of the accessory control circuit. The first voltage amplification circuit includes an operational amplifier U3AA, and the second voltage amplification circuit includes U3BB. The inverting input terminal and the non-inverting input terminal of the operational amplifier U3AA are respectively connected to both ends of the resistor R53 through a resistor R48 and a resistor R57, and the inverting input terminal of the operational amplifier U3AA is connected to the output end of the operational amplifier U3AA through a resistor R41. The non-inverting input terminal of the operational amplifier U3AA is connected to a voltage reference terminal through a resistor R58; the inverting input terminal of the operational amplifier U3BB is connected to the output end of the operational amplifier U3AA through a resistor R50, the non-inverting input terminal of the operational amplifier U3BB is connected to the voltage reference terminal through a resistor R56, the output end of the operational amplifier U3BB is respectively connected to a resistor R51 and a resistor R42, the other end of the resistor R51 is connected to the single-chip microcomputer circuit, and the other end of the resistor R42 is connected to the inverting input terminal of the operational amplifier U3BB.

[0012] Preferably, it includes a plurality of circuit breaker accessories, and the plurality of circuit breaker accessories are respectively a first accessory or a second accessory. The accessory monitoring circuit includes a first monitoring circuit for monitoring the working voltage across both ends of the first accessory and a second monitoring circuit for monitoring the working voltage across both ends of the second accessory.

[0013] Preferably, it includes a plurality of accessory control circuits and a plurality of accessory monitoring circuits. The plurality of accessory control circuits are used to respectively control a plurality of second accessories, and the plurality of accessory monitoring circuits are used to respectively monitor a plurality of second accessories. The plurality of second accessories are respectively a shunt trip, a closing electromagnet, and a stored energy motor, and the working principles of the plurality of accessory control circuits are the same.

[0014] Preferably, the second monitoring circuit includes an optocoupler U11. The optocoupler U11 includes a cooperating light-emitting diode and an output triode. The positive and negative electrodes of the light-emitting diode of the optocoupler U11 are respectively the two input terminals of the optocoupler U11, and both ends of the output triode are respectively the two output terminals of the optocoupler U11. The positive electrode of the light-emitting diode of the optocoupler U11 is sequentially connected to the power input terminal of the second accessory through a resistor R77, a voltage-regulating diode DZ6, a resistor R78, a resistor R79, a resistor R80, and a diode D11. The negative electrode of the light-emitting diode of the optocoupler U11 is also connected to the power input terminal of the second accessory through a resistor R83. One end of the output triode of the optocoupler U11 is connected to the power supply circuit through a resistor R81, and the other end of the output triode of the optocoupler U11 is respectively connected to the input terminal of the single-chip microcomputer circuit and a resistor R84, and the other end of the resistor R84 is grounded. The first monitoring circuit includes a differential amplifier circuit. The differential amplifier circuit includes an operational amplifier U3A. The output terminal of the operational amplifier U3A is connected to the input terminal of the single-chip microcomputer circuit through a resistor R6. The non-inverting input terminal of the operational amplifier U3A is respectively connected to a resistor R1 and a resistor R2. The other end of the resistor R1 is grounded, and the other end of the resistor R2 is sequentially connected to a resistor R3, a resistor R4, a resistor R5, and the negative electrode of a diode D2. The positive electrode of the diode D2 is connected to one input terminal of the differential amplifier circuit. The inverting input terminal of the operational amplifier U3A is respectively connected to a resistor R12 and a resistor R8. The other end of the resistor R12 is connected to the output terminal of the operational amplifier U3A. The other end of the resistor R8 is sequentially connected to a resistor R9, a resistor R10, a resistor R11, and the positive electrode of a diode D3. The negative electrode of the diode D3 is connected to the other input terminal of the differential amplifier circuit.

[0015] Preferably, the power supply circuit includes a filtering circuit, a DC / DC conversion circuit, and an LDO circuit; the filtering circuit includes a fuse F1 connected to the VIN+ input terminal of the power supply circuit. The other end of the fuse F1 is respectively connected to an inductor L1 and a varistor RV1. The other end of the varistor RV1 is connected to the VIN- input terminal of the power supply circuit. The other end of the inductor L1 is connected to the positive electrode of a diode D4. The negative electrode of the diode D4 is respectively connected to the positive electrodes of an electrolytic capacitor C5 and a ceramic capacitor C2. The negative electrodes of the electrolytic capacitor C5 and the ceramic capacitor C2 are respectively connected to the VIN- input terminal of the power supply circuit; the DC / DC conversion circuit includes a chip U1. The first pin and the third pin of the chip U1 are respectively connected to the VIN+ output terminal of the power supply circuit and the VIN- output terminal of the power supply circuit 22 through the filtering circuit. The second pin of the chip U1 is respectively connected to a fast recovery diode DZ1 and an inductor L2. The other end of the fast recovery diode DZ1 is grounded. The other end of the inductor L2, as well as an electrolytic capacitor C7, a ceramic capacitor C6, and a transient voltage suppressor diode TVS1, are respectively connected to the fourth pin of the chip U1. The fifth pin of the chip U1 is grounded; the LDO circuit includes a chip U4. The first pin of the chip U4 is connected to the fourth pin of the chip U1. The fifth pin of the chip U4 is respectively connected to a capacitor C3, a capacitor C4, and the output terminal of the power supply circuit. The other ends of the capacitor C3 and the capacitor C4 are respectively grounded.

[0016] The breaker accessory protection module of the present invention. The accessory protection module cooperates with the breaker accessory through an accessory control circuit. When a fault occurs in the breaker accessory, the breaker accessory is powered off to prevent damage caused by long-term power-on during the fault of the breaker accessory, and particularly can prevent equipment such as a storage motor from being damaged due to long-term power-on. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the structural diagram of the accessory protection module in Embodiment 1 of the present invention;

[0018] Figure 2 is the first working mode of Embodiment 1 of the present invention;

[0019] Figure 3 is the circuit diagram of the first monitoring circuit in Embodiment 1 of the present invention;

[0020] Figure 4 is the circuit diagram of the second monitoring circuit in Embodiment 1 of the present invention;

[0021] Figure 5 is the circuit diagram of the single-chip microcomputer circuit in Embodiment 1 of the present invention;

[0022] Figure 6 is the circuit diagram of the power supply circuit in Embodiment 1 of the present invention;

[0023] Figure 7It is the circuit diagram of the bus interface circuit in the embodiment of the present invention

[0024] Figure 8 It is the circuit diagram of the LED indication circuit in the embodiment of the present invention

[0025] Figure 9 It is the structural diagram of the accessory protection module in the second embodiment of the present invention

[0026] Figure 10 It is the first working mode of the second embodiment of the present invention

[0027] Figure 11 It is the second working mode of the second embodiment of the present invention

[0028] Figure 12 It is the circuit diagram of the accessory monitoring circuit and the accessory control circuit in the embodiment of the present invention

[0029] Figure 13 It is the structural diagram of the accessory protection module in the third embodiment of the present invention

[0030] Figure 14 It is the first working mode of the third embodiment of the present invention

[0031] Figure 15 It is the second working mode of the third embodiment of the present invention

[0032] Figure 16 It is the circuit diagram of the DI input detection circuit in the embodiment of the present invention

[0033] Figure 17 It is the circuit diagram of the DO output circuit in the embodiment of the present invention

[0034] Figure 18 It is the circuit diagram of the switch state detection circuit in the embodiment of the present invention Specific embodiments

[0035] The following is combined with the attached Figures 1 to 18 The given embodiments are used to further illustrate the specific implementation manners of the circuit breaker accessory protection module of the present invention. The circuit breaker accessory protection module of the present invention is not limited to the descriptions of the following embodiments.

[0036] Such as Figure 1 、 2As shown in the figure, the circuit breaker of the present invention includes a drawer base and a circuit breaker body 1 and an accessory protection module 2 disposed within the drawer base. The circuit breaker body 1 includes an intelligent controller 11 and circuit breaker accessories. The accessory protection module 2 includes a power supply circuit 22, a single-chip microcomputer circuit 23, and an accessory monitoring circuit 24. The accessory monitoring circuit 24 is connected to the single-chip microcomputer circuit 23, and the power supply circuit 22 supplies power to the single-chip microcomputer circuit 23 and the accessory monitoring circuit 24. The accessory monitoring circuit 24 is used to connect to the circuit breaker accessories and collect the operating voltage of the circuit breaker accessories. The single-chip microcomputer circuit 23 determines whether the circuit breaker accessories are faulty based on the operating voltage.

[0037] For the accessory protection module of the circuit breaker of the present invention, the operating voltage of the circuit breaker accessories is monitored by the accessory monitoring circuit 24, and the operating state of the circuit breaker accessories is calculated by the single-chip microcomputer circuit 23. If a fault occurs in the circuit breaker accessories, a timely response can be made.

[0038] Furthermore, the accessory protection module 2 is an independent module. The accessory protection module 2 further includes a bus interface circuit 21 connected to the single-chip microcomputer circuit 23. The bus interface circuit 21 is used to connect to the intelligent controller 11 of the circuit breaker body 1 or a client host. The intelligent controller 11 or the client host can obtain the operating state of the circuit breaker accessories in the single-chip microcomputer circuit 23 through the bus interface circuit 21, enabling the intelligent controller 11 to check the circuit breaker accessories by itself according to the information of the accessory protection module 2 during operation.

[0039] Furthermore, the accessory protection module 2 further includes an LED indication circuit 20 connected to the single-chip microcomputer circuit 23. The single-chip microcomputer circuit 23 can indicate the operating state of the circuit breaker accessories through the LED indication circuit 20.

[0040] As Figure 2 shown in the embodiment of the accessory protection module 2, the circuit breaker body 1 includes a plurality of circuit breaker accessories. The plurality of circuit breaker accessories are respectively a first accessory or a second accessory. The accessory monitoring circuit 24 includes a first monitoring circuit for monitoring the operating voltage across the first accessory and a second monitoring circuit for monitoring the operating voltage across the second accessory. Of course, the plurality of circuit breaker accessories can also all be first accessories or all be second accessories, which all fall within the protection scope of the present invention.

[0041] Furthermore, the first monitoring circuit includes a differential amplifier circuit. The input end of the differential amplifier circuit is connected to the power input end of the first accessory, and the output end of the differential amplifier circuit is connected to the single-chip microcomputer circuit 23. The single-chip microcomputer circuit 23 determines whether the first accessory is faulty. The single-chip microcomputer circuit 23 includes an MCU and an A / D converter. The differential amplifier circuit converts the voltage signal at the power supply end of the first accessory into a proportional AD signal. The single-chip microcomputer circuit 23 obtains the effective voltage value based on the signal of the accessory monitoring circuit 24 and determines whether there is a fault in the first accessory according to the obtained effective voltage value.

[0042] Further, the second monitoring circuit includes an optocoupler. Two input terminals of the optocoupler are respectively connected to the power input terminal of the second accessory, and are used for monitoring whether there is a working voltage in the circuit breaker accessory. Two output terminals of the optocoupler are respectively connected to the input terminals of the single-chip microcomputer circuit 23 and the power supply circuit 22. The two input terminals of the optocoupler can be turned on when there is a working voltage in the second accessory, and a path is formed between the two input terminals of the optocoupler, so that the power supply circuit 22 outputs a signal to the single-chip microcomputer circuit 23 through the two input terminals of the optocoupler.

[0043] As Figure 2 、 3 shown in the preferred embodiment of the first monitoring circuit, the first accessory is an under-voltage release 12, the first monitoring circuit is an under-voltage monitoring circuit 244, and the first monitoring circuit includes a differential amplifier circuit. The differential amplifier circuit includes an operational amplifier U3A. The output terminal of the operational amplifier U3A is connected to the input terminal of the single-chip microcomputer circuit 23 through a resistor R6. The non-inverting input terminal of the operational amplifier U3A is respectively connected to a resistor R1 and a resistor R2. The other end of the resistor R1 is grounded. The other end of the resistor R2 is sequentially connected to the cathode of a diode D2 through resistors R3, R4, and R5. The anode of the diode D2 is connected to one input terminal of the differential amplifier circuit. The inverting input terminal of the operational amplifier U3A is respectively connected to a resistor R12 and a resistor R8. The other end of the resistor R12 is connected to the output terminal of the operational amplifier U3A. The other end of the resistor R8 is sequentially connected to the anode of a diode D3 through resistors R9, R10, and R11. The cathode of the diode D3 is connected to the other input terminal of the differential amplifier circuit. Generally, the operating characteristic of the under-voltage release is that it can be reliably released when the power supply terminal voltage is 0.35Ue, and can be reliably attracted when the power supply terminal voltage is 0.7Ue. The single-chip microcomputer circuit 23 compares the effective voltage value obtained from the signal of the accessory monitoring circuit 24 with a preset under-voltage threshold value to judge whether there is a fault in the under-voltage release 12. If the effective voltage value is lower than the minimum under-voltage threshold value, it is considered that there is a fault.

[0044] Further, the first monitoring circuit further includes a parallel-connected resistor R7 and capacitor C1. One end of the parallel-connected resistor R7 and capacitor C1 is connected to the resistor R9, and the other end of the parallel-connected resistor R7 and capacitor C1 is connected to the resistor R3.

[0045] As Figure 2 、 4Shows a preferred embodiment of the second monitoring circuit, including a plurality of second accessories and a plurality of second monitoring circuits. The operating principles of the plurality of second monitoring circuits are the same. For example, the plurality of second accessories are respectively the shunt trip 13, the closing electromagnet 14, and the energy storage motor 15, and the plurality of second monitoring circuits are respectively the shunt monitoring circuit 245 connected to the shunt trip 13, the closing monitoring circuit 246 connected to the closing electromagnet 14, and the motor monitoring circuit 247 connected to the energy storage motor 15.

[0046] The second monitoring circuit described above includes an optocoupler U11. The optocoupler U11 includes a cooperating light-emitting diode and an output triode. The positive and negative electrodes of the light-emitting diode of the optocoupler U11 are respectively the two input terminals of the optocoupler U11, and the two ends of the output triode are respectively the two output terminals of the optocoupler U11. The positive electrode of the light-emitting diode of the optocoupler U11 is sequentially connected to the power input terminal of the second accessory through a resistor R77, a zener diode DZ6, a resistor R78, a resistor R79, a resistor R80, and a diode D11. The negative electrode of the light-emitting diode of the optocoupler U11 is also connected to the power input terminal of the second accessory through a resistor R83. One end of the output triode of the optocoupler U11 is connected to the power supply circuit 22 through a resistor R81. The other end of the output triode of the optocoupler U11 is respectively connected to the input terminal of the single-chip microcomputer circuit 23 and a resistor R84, and the other end of the resistor R84 is grounded.

[0047] Further, the second monitoring circuit further includes a parallel-connected resistor R82 and capacitor C19. One end of the parallel connection of the resistor R82 and the capacitor C19 is connected to the positive electrode of the zener diode DZ6, and the other end of the parallel connection of the resistor R82 and the capacitor C19 is connected to the resistor R83.

[0048] The operating principles of the shunt monitoring circuit 245, the closing monitoring circuit 246, and the motor monitoring circuit 247 are the same, and they are only used to monitor different circuit breaker accessories. The diode D11 and the resistor R83 are respectively connected to the power input terminals of their corresponding circuit breaker accessories.

[0049] As Figure 5 Shows a preferred embodiment of the single-chip microcomputer circuit 23. The single-chip microcomputer circuit 23 includes a chip U5 and an oscillation circuit and a reset circuit respectively connected to the chip U5. The model of the chip U5 is preferably STM32F051. The oscillation circuit can form oscillation pulses to enable the chip U5 to operate orderly according to the oscillation rhythm, and the reset circuit can form an integrating circuit to generate a reset pulse at the moment of power-on to reset the chip U5.

[0050] Further, the oscillation circuit includes a crystal oscillator X1. One end of the crystal oscillator X1 is respectively connected to a capacitor C11 and the PFO terminal of a chip U5, and the other end of the crystal oscillator X1 is respectively connected to a capacitor C14 and the PF1 terminal of the chip U5. The other ends of the capacitor C11 and the capacitor C14 are respectively grounded; the reset circuit includes a resistor R29 and a capacitor C15. One end of the resistor R29 is connected to the capacitor C15 and the NRST terminal of the chip U5, and the other end of the capacitor R29 is connected to the VBAT terminal of the chip U5.

[0051] As Figure 6 FIG. shows a preferred embodiment of the power supply circuit 22. The power supply circuit 22 includes a filter circuit, a DC / DC conversion circuit, and an LDO circuit. Specifically, the filter circuit includes a fuse F1 connected to the VIN+ input terminal of the power supply circuit 22. The other end of the fuse F1 is respectively connected to an inductor L1 and a varistor RV1. The other end of the varistor RV1 is connected to the VIN- input terminal of the power supply circuit 22. The other end of the inductor L1 is connected to the anode of a diode D4. The cathode of the diode D4 is respectively connected to the anode of an electrolytic capacitor C5 and one end of a ceramic capacitor C2. The cathode of the electrolytic capacitor C5 and the other end of the ceramic capacitor C2 are respectively connected to the VIN- input terminal of the power supply circuit 22.

[0052] The DC / DC conversion circuit includes a chip U1. The chip U1 is preferably an LM2575 integrated circuit. The first pin (Vin) and the third pin (GND) of the chip U1 are respectively connected to the VIN+ output terminal and the VIN- output terminal of the power supply circuit 22 through the filter circuit. The second pin (Vout) of the chip U1 is respectively connected to a fast recovery diode DZ1 and an inductor L2. The other end of the fast recovery diode DZ1 is grounded. The other end of the inductor L2, as well as an electrolytic capacitor C7, a ceramic capacitor C6, and a transient suppression diode TVS1, are respectively connected to the fourth pin (Feedback) of the chip U1. The fifth pin ( / ON / OFF) of the chip U1 is grounded and is in an always enabled state.

[0053] The LDO circuit includes a chip U4. The chip U4 is preferably an SPX5205 integrated circuit. The first pin (Vin) of the chip U4 is connected to the fourth pin of the chip U1. The fifth pin (Vout) of the chip U4 is respectively connected to a capacitor C3, a capacitor C4, and the output terminal of the power supply circuit 22. The other ends of the capacitor C3 and the capacitor C4 are respectively grounded.

[0054] As Figure 7Shows a preferred embodiment of the bus interface circuit 21. The bus interface circuit 21 adopts the isolated RS485 type. The bus interface circuit 21 includes a chip U2, and the model of the chip U2 is preferably RSM3485. The TXD input terminal, RXD input terminal and COM direction control terminal of the chip U2 are respectively connected to the TXDO input terminal, RXDO input terminal and CODO input terminal of the RS485 interface. The RGND terminal, A terminal and B terminal of the chip U2 are respectively connected to the RGND output terminal, A+ output terminal and B- output terminal of the RS485 interface. The RGND output terminal is connected to the TVS tube D1, and the other end of the TVS tube D1 is respectively connected to the A+ output terminal and B- output terminal. Of course, the bus interface circuit 21 can also be of the CAN or Profibus bus type instead of RS485, which all fall within the protection scope of the present invention.

[0055] As Figure 8 Shows a preferred embodiment of the LED indication circuit 20. The LED indication circuit 20 includes a plurality of light-emitting diodes. One end of the light-emitting diodes is respectively connected to the power supply circuit 22, and the other end of the light-emitting diodes is respectively connected to the single-chip microcomputer circuit 23 through resistors. Connecting to different terminals of the single-chip microcomputer circuit 23 is used to indicate the states of different circuit breaker accessories. When the single-chip microcomputer circuit 23 outputs a high level, the light-emitting diodes emit light, and when the single-chip microcomputer circuit 23 outputs a low level, the light-emitting diodes go out.

[0056] Embodiment 1

[0057] As Figure 1 As shown, the accessory protection module 2 includes an undervoltage monitoring circuit 244, a shunt release monitoring circuit 245, a closing monitoring circuit 246 and a motor monitoring circuit 247 which are respectively connected to the single-chip microcomputer circuit 23. It also includes a position detection circuit 240 connected to the closing monitoring circuit 246. The position detection circuit 240 is connected to the single-chip microcomputer circuit 23 and is used to detect the opening and closing states of the circuit breaker body 1. Usually, the position detection circuit 240 cooperates with a microswitch to detect the position of the mechanical action inside the circuit breaker to confirm whether its action is in place. The position detection circuit 240 is connected to the microswitch to provide signals for the single-chip microcomputer circuit 23.

[0058] As Figure 2 Shows the first working mode of the accessory protection module 2. The bus interface circuit 21 of the accessory protection module 2 is connected to the internal bus of the intelligent controller 11, and the external bus of the intelligent controller 11 is connected to the background monitoring software. The accessory protection module 2 monitors the states of each circuit breaker accessory in real time and feeds them back to the single-chip microcomputer circuit 23 for storage. The intelligent controller 11 queries (accesses) the circuit breaker accessory status information in the single-chip microcomputer circuit 23 at intervals (such as 1 second). The intelligent controller 11 pre-processes the query results and transmits them to the background monitoring software through the external bus.

[0059] Embodiment 2

[0060] As Figure 9 shown, the accessory protection module 2 includes an accessory monitoring circuit 24 connected to the single-chip microcomputer circuit 23, and also includes an accessory control circuit 26 connected to the single-chip microcomputer circuit 23. The accessory control circuit 26 includes a relay connected to the power input terminal of the breaker accessory. When a fault occurs in the breaker accessory, the single-chip microcomputer circuit 23 cuts off the power supply of the breaker accessory through the relay of the accessory control circuit 26.

[0061] The accessory protection module 2 cooperates with the breaker accessory through the accessory control circuit 26, and cuts off the power supply of the breaker accessory when a fault occurs in the breaker accessory, preventing damage caused by long-term power-on during the fault of the breaker accessory. For example, it can prevent equipment such as the energy storage motor 15 of the breaker from being damaged due to long-term power-on.

[0062] Furthermore, the accessory protection module 2 further includes an accessory monitoring circuit 25. The accessory monitoring circuit 25 is connected to the single-chip microcomputer circuit 23 and the breaker accessory, and is used to connect to the breaker accessory and collect the working current of the breaker accessory. The accessory monitoring circuit 25 includes a monitoring resistor connected in series with the breaker accessory, and a voltage amplification circuit connected to both ends of the monitoring resistor. The voltage amplification circuit can amplify the voltage drop across the monitoring resistor and send it to the single-chip microcomputer circuit 23. The single-chip microcomputer circuit 23 calculates the working current of the breaker accessory based on the signal provided by the accessory monitoring circuit 25 to determine whether the breaker accessory is working properly. If the breaker accessory is normally connected and there is no wire break, a working current will be generated; conversely, if there is a wire break fault in the breaker accessory, no working current will be generated, and a fault occurs in the breaker accessory.

[0063] The function of the accessory monitoring circuit 24 is to collect the voltage across the breaker accessory (such as the closing electromagnet), while the function of the accessory monitoring circuit 25 is to collect the current (flowing through the electromagnet). For example, the input terminals 31 and 32 of the accessory monitoring circuit 24 are respectively connected to the two terminals of the electromagnet coil of the closing electromagnet. The input terminal 32 of the accessory control circuit 26 is connected to one end of the electromagnet coil, and the other end of the electromagnet coil is connected to the power supply voltage, forming a connection of the electromagnet coil in series to the power supply voltage, which plays a role in collecting the current of the electromagnet coil. When it is detected that the electromagnetic coil is energized for a long time, the coil circuit can be disconnected from the power supply through the accessory control circuit 26, which has the advantage of protecting the coil from being damaged by heating.

[0064] The accessory protection module 2 of this embodiment can not only cut off the power supply of the breaker accessory through the accessory control circuit 26 when a fault occurs in the breaker accessory, but also the accessory monitoring circuit 25 can monitor the working state of the breaker accessory through the accessory control circuit 26, greatly improving the reliability of the breaker.

[0065] AsFigure 9 , 10 As shown in 10 , this embodiment includes multiple breaker accessories and multiple accessory control circuits 26. The multiple breaker accessories are respectively the first accessory or the second accessory. The multiple accessory control circuits 26 are used to control the multiple second accessories respectively, and the operating principles of the multiple accessory control circuits 26 are the same.

[0066] The multiple second accessories are respectively a shunt trip 13, a closing electromagnet 14, and a charging motor 15. The multiple accessory control circuits 26 are respectively a shunt control circuit connected to the shunt trip 13, a closing control circuit connected to the closing electromagnet 14, and a motor control circuit connected to the charging motor 15. The operating principles of the shunt control circuit, the closing control circuit, and the motor control circuit are the same, and they are only used to control different breaker accessories. The relays of the shunt control circuit, the closing control circuit, and the motor control circuit are respectively connected to the power input terminals of the corresponding breaker accessories.

[0067] Furthermore, it includes multiple accessory monitoring circuits 25. The multiple accessory monitoring circuits 25 are used to monitor the multiple second accessories respectively, and the operating principles of the multiple accessory monitoring circuits 25 are the same. The multiple accessory monitoring circuits 25 are respectively a shunt monitoring circuit of the trip connected to the shunt control circuit, a closing monitoring circuit of the trip connected to the closing control circuit, and a motor control circuit of the trip connected to the motor control circuit. The operating principles of the shunt monitoring circuit, the monitoring circuit, and the motor control circuit are the same, and they are only used to monitor different breaker accessories. The input terminals of the voltage amplification circuits of the shunt monitoring circuit, the monitoring circuit, and the motor control circuit are respectively connected to the corresponding accessory monitoring circuits 25.

[0068] As Figure 12 shown in the preferred embodiment of the accessory control circuit 26 and the accessory monitoring circuit 25, the accessory control circuit 26 includes a relay K1. One end of the normally closed contact of the relay K1 is connected to the live wire through the breaker accessory, and the other end of the normally closed contact of the relay K1 is connected to the neutral wire through a resistor R53. Two ends of the coil of the relay K1 are connected in parallel with a diode D8. One end of the coil of the relay K1 is connected to the power supply, and the other end of the coil of the relay K1 is connected to the collector of a triode Q1. The emitter of the triode Q1 is grounded, and the base of the triode Q1 is connected to the single-chip microcomputer circuit 23 through a resistor R52.

[0069] In this embodiment, the power supply of the breaker accessory is controlled by the relay K1. When the single-chip microcomputer circuit 23 outputs a high level, the normally closed contact of the relay K1 disconnects, and the breaker accessory loses power. When the single-chip microcomputer circuit 23 outputs a low level, the normally closed contact of the relay K1 closes, and the breaker accessory gets power.

[0070] As Figure 12Shows a preferred embodiment of the accessory monitoring circuit 25, which includes a monitoring resistor and a voltage amplification circuit. The voltage amplification circuit includes a first voltage amplification circuit and a second voltage amplification circuit. The first voltage amplification circuit is connected to both ends of the monitoring resistor, and the second voltage amplification circuit is connected to the output end of the first voltage amplification circuit. The voltage drop across the monitoring resistor is amplified twice by the first voltage amplification circuit and the second voltage amplification circuit and then transmitted to the single-chip microcomputer circuit 23.

[0071] Preferably, the monitoring resistor is a resistor R53 connected in series with the relay K1 of the accessory control circuit 26. Of course, the monitoring resistor may not be connected in series with the relay K1.

[0072] Specifically, one end of the resistor R53 is connected in series with the relay K1 of the accessory control circuit 26. The first voltage amplification circuit includes an operational amplifier U3AA, and the second voltage amplification circuit includes an operational amplifier U3BB. The inverting input terminal and the non-inverting input terminal of the operational amplifier U3AA are respectively connected to both ends of the resistor R53 through the resistor R48 and the resistor R57, and the inverting input terminal of the operational amplifier U3AA is connected to the output terminal of the operational amplifier U3AA through the resistor R41. The non-inverting input terminal of the operational amplifier U3AA is connected to the voltage reference terminal (1.5V) through the resistor R58; the inverting input terminal of the operational amplifier U3BB is connected to the output terminal of the operational amplifier U3AA through the resistor R50, the non-inverting input terminal of the operational amplifier U3BB is connected to the voltage reference terminal (1.5V) through the resistor R56, the output terminal of the operational amplifier U3BB is respectively connected to the resistor R51 and the resistor R42, the other end of the resistor R51 is connected to the single-chip microcomputer circuit 23, and the other end of the resistor R42 is connected to the inverting input terminal of the operational amplifier U3BB.

[0073] When the relay K1 is closed, current passes through the resistor R53, so there is a voltage drop across the resistor R53. The voltage drop is amplified by two-stage operational amplifiers, and the amplified signal is input to the AD port of the single-chip microcomputer circuit 23. Based on the AD signal of the accessory monitoring circuit 25 obtained by the single-chip microcomputer circuit 23, the working current of the circuit breaker accessory is calculated to determine whether the circuit breaker accessory is working normally, such as whether it is normally closed.

[0074] Such as Figure 10The first working mode of the accessory protection module 2 is shown. The bus interface circuit 21 of the accessory protection module 2 is connected to the internal bus of the intelligent controller 11, and the external bus of the intelligent controller 11 is connected to the background monitoring software. The accessory protection module 2 monitors the status of each circuit breaker accessory in real time and transmits it to the single-chip microcomputer circuit 23 for storage. The intelligent controller 11 queries (accesses) the status information of the circuit breaker accessories in the single-chip microcomputer circuit 23 at intervals (such as 1 second). After pre-processing the query results, the intelligent controller 11 transmits the data to the background monitoring software through the external bus. The background monitoring software can be cloud service, or an upper PC, or a mobile phone APP, etc.

[0075] Such as Figure 11 The second working mode of the accessory protection module 2 is shown. The accessory protection module 2 is connected to the upper computer (client host) through the bus interface circuit 21. The background software of the upper computer monitors the status of each circuit breaker accessory in real time through the bus interface circuit 21 and can perform power-off control on each circuit breaker accessory through the accessory control circuit 26 to avoid damage to individual accessories due to long-term power-on.

[0076] Embodiment III

[0077] Such as Figure 13 As shown, the accessory protection module 2 further includes a programmable logic interface circuit 29. The programmable logic interface circuit 29 includes a DI input detection circuit and a DO output circuit. The output end of the DI input detection circuit and the input end of the DO output circuit are respectively connected to the single-chip microcomputer circuit 23. The input end of the DI input detection circuit and the output end of the DO output circuit are respectively connected to the user DI input signal \ DO output. The single-chip microcomputer circuit 23 can recognize the input signal of the DI input detection circuit, and the single-chip microcomputer circuit 23 can control the output signal of the DO output circuit.

[0078] The single-chip microcomputer circuit 23 can recognize the input signal of the DI input detection circuit and control the output signal of the DO output circuit. The user can perform various custom settings through the programmable logic interface circuit 29. For example, by sending a serial port instruction from the intelligent controller 11, controlling the relay K4 of the DO output circuit to act, realizing functions such as circuit breaker area interlock, remote opening and closing, etc., which can not only reduce the difficulty of installation, maintenance and debugging, but also be more convenient to use.

[0079] Further, the accessory protection module 2 further includes a drawer seat position detection circuit 28. When the circuit breaker body 1 is in use, it needs to move between the separated position, test position, and connection position of the drawer seat to disconnect, test, and conduct the circuit breaker body 1. The drawer seat position detection circuit 28 includes three microswitches respectively arranged at the separated position, test position, and connection position, and three trigger detection circuits respectively connected to the three microswitches. The three trigger detection circuits are respectively connected to the single-chip microcomputer circuit 23. When the circuit breaker body 1 moves to the separated position, test position, and connection position respectively, the corresponding microswitch is triggered, and a signal is output to the single-chip microcomputer circuit 23 through the trigger detection circuit to detect the position of the circuit breaker body 1 in the drawer seat in real time. The drawer seat position detection circuit 28 is the same as the position detection circuit 240.

[0080] Further, the accessory protection module 2 further includes a switch state detection circuit 27 connected to the single-chip microcomputer circuit 23. The switch state detection circuit 27 is used to connect to the switch state microswitch of the circuit breaker body 1. The switch state microswitch cooperates with the main contacts of the circuit breaker body 1 to indicate the position of the main contacts and transmit it to the single-chip microcomputer circuit 23. The closing and opening states of the circuit breaker are monitored through the switch state microswitch. When the circuit breaker body 1 is closed, the switch state microswitch remains closed; when the circuit breaker body 1 is opened, the switch state microswitch remains open. The switch state microswitch is installed on the circuit breaker body, and its working state is the same as that of the main contacts of the circuit breaker, that is, when the circuit breaker is closed, the switch state microswitch can be triggered to keep it closed, and when the circuit breaker is opened, the switch state microswitch remains open.

[0081] As Figure 18 shown, the working principle of the switch state detection circuit 27 is the same as that of the position detection circuit 240, the trigger detection circuit, and the second monitoring circuit, except that the input of the detection circuit has changed. The power supply L is connected to the input end of the switch state detection circuit 27 after passing through the microswitch WD1 synchronized with the circuit breaker, and the other input end of the switch state detection circuit 27 is connected to the power supply N; when the microswitch WD1 is closed, the PB1 point output by the optocoupler is at a high level; when the microswitch is open, the PB1 point output by the optocoupler is at a low level.

[0082] As Figure 16Shows a preferred embodiment of the DI input detection circuit. The single-chip microcomputer circuit 23 can identify the input signal of the DI input detection circuit, and the single-chip microcomputer circuit 23 can control the output signal of the DO output circuit. The DI input detection circuit includes an optocoupler U30. The optocoupler U30 includes a cooperating light-emitting diode and an output triode. The positive pole of the light-emitting diode of the optocoupler U30 is sequentially connected to the J7 input terminal of the DI input detection circuit through resistors R32, R33, R34, R35, R36, and R37. The negative pole of the light-emitting diode of the optocoupler U30 is connected to the J8 input terminal of the DI input detection circuit. One end of the output triode of the optocoupler U30 is connected to the power supply circuit 22. The other end of the output triode of the optocoupler U30 is respectively connected to the IO port of the single-chip microcomputer circuit 23 and the resistor R25. The other end of the resistor R25 is grounded. Users can perform various custom settings through the output of the DO output circuit. The DO output circuit can also be used to output the working state of the breaker accessory. For example, in the case of the working state of the breaker accessory, a fault signal is output when the breaker accessory fails, or it can also be a signal for controlling other breakers to achieve functions such as regional interlocking.

[0083] A voltage state detection circuit is formed through the optocoupler U30. When there is an external input voltage, the E pole of the output triode of the optocoupler U30 is at a high level, and vice versa at a low level. The single-chip microcomputer circuit 23 identifies the state of the DI input detection circuit by judging the level of the E pole of the output triode of the optocoupler U30. The figure only shows one path schematically. In actual applications, multiple DI input detection circuits can be respectively connected to the single-chip microcomputer circuit 23.

[0084] Such as Figure 17 Shows a preferred embodiment of the DO output circuit. The DO output circuit includes a relay K4, a triode Q30, and an optocoupler U90. The two ends of the normally open contact of the relay K4 are respectively connected to the two output terminals of the DO output circuit. The triode Q30 and the coil of the relay K4 are connected in series with the power supply. The optocoupler U90 can turn on the triode Q30 through the base of the triode Q30, so that the coil of the relay K4 is energized to attract the action of the normally open contact of the relay K4;

[0085] Optocoupler U90 includes a cooperating light-emitting diode and output triode. One end of the light-emitting diode of optocoupler U90 is connected to power supply circuit 22 via resistor R800, and the other end is connected to the I / O of microcontroller circuit 23. The E pole of the output triode of optocoupler U90 is grounded, and the collector of the output triode of optocoupler U90 is connected to the base of triode Q30. One end of the coil of relay K4 is respectively connected to the power supply, the positive pole of diode D30, and resistor R30. The other end of the coil of relay K4 is respectively connected to the collector of triode Q30 and the negative pole of diode D30. The other end of resistor R30 is connected to the base of triode Q30, and the emitter of triode Q30 is grounded. When the I / O port of microcontroller circuit 23 outputs a high level, the normally open contact of relay K4 closes; otherwise, the normally open contact of K4 opens. The figure only shows one path, and in actual application, it can be a multi-channel DO output circuit.

[0086] As a preferred embodiment of drawer seat position detection circuit 28, drawer seat position detection circuit 28 includes a separating microswitch, a test microswitch, and a connecting microswitch respectively arranged at the separating position, test position, and connecting position to cooperate with circuit breaker body 1, and a separating trigger circuit respectively connected to the separating microswitch, a test trigger circuit connected to the test microswitch, and a connecting trigger circuit connected to the connecting microswitch. One ends of the separating microswitch, test microswitch, and connecting microswitch are respectively connected to the live wire, and the other ends are respectively connected to the accessory module. The separating trigger circuit, test trigger circuit, and connecting trigger circuit are respectively used to detect whether there is voltage between the separating microswitch, test microswitch, and connecting microswitch and the neutral wire.

[0087] When circuit breaker body 1 moves to the separating position, test position, and connecting position, it can respectively trigger the microswitches at the corresponding positions, and output signals to microcontroller circuit 23 through the detection trigger circuit. When the detection trigger circuit at the separating position outputs a signal to microcontroller circuit 23, it indicates that circuit breaker body 1 has moved to the separating position. The same applies to the test position and connecting position.

[0088] Refer to Figure 4Shows a preferred embodiment of the trigger detection circuit. The trigger detection circuit in this embodiment is the same as the second monitoring circuit described above, that is, the working principles of the separation trigger circuit, the test trigger circuit, and the connection trigger circuit are the same. Only the input end of the second monitoring circuit is connected to the power input end of the circuit breaker accessory, used to detect whether there is voltage at the power input end of the circuit breaker accessory. While the positive and negative poles of the light-emitting diode of the optocoupler U11 in the trigger detection circuit are respectively connected to the neutral wire of the microswitch. That is, the positive pole of the light-emitting diode of the optocoupler U11 passes through the resistor R77, the voltage-regulating diode DZ6, the resistor R78, the resistor R79, the resistor R80, and the diode D11 in sequence, and the negative pole of the light-emitting diode of the optocoupler U11 passes through the resistor R83 and is respectively connected to the neutral wire of the microswitch, used to detect whether there is voltage at the neutral wire of the microswitch. When the circuit breaker body 1 moves to the separation position, the test position, and the connection position, the corresponding microswitch is triggered. When the microswitch operates, it can form a current between the diode D11 and the resistor R83 in the corresponding second monitoring circuit, making the light-emitting diode of the optocoupler U11 emit light and turn on the output triode of the optocoupler U11. Then, the signal is output to the single-chip microcomputer circuit 23 through the output triode of U11. If the output triode of the optocoupler U11 at the separation position outputs the signal to the single-chip microcomputer circuit 23, it indicates that the circuit breaker body 1 has moved to the separation position. The test position and the connection position are the same.

[0089] Furthermore, the accessory protection module 2 further includes a switch state detection circuit 27. The switch state detection circuit 27 detects the switch state and then connects to the single-chip microcomputer circuit 23 to monitor the state of the circuit breaker switch in real time.

[0090] As Figure 14 Shows the first working mode of the accessory protection module 2. The bus interface circuit 21 of the accessory protection module 2 is connected to the internal bus of the intelligent controller 11, and the external bus of the intelligent controller 11 is connected to the background monitoring software. The accessory protection module 2 monitors the states of each circuit breaker accessory in real time and transmits them to the single-chip microcomputer circuit 23 for storage. The intelligent controller 11 queries (accesses) the circuit breaker accessory state information in the single-chip microcomputer circuit 23 at intervals (such as 1 second). The intelligent controller 11 pre-processes the query results and then transmits them to the background monitoring software through the external bus.

[0091] As Figure 15 Shows the second working mode of the accessory protection module 2. The accessory protection module 2 is connected to the host computer (client host) through the bus interface circuit 21. The background software of the host computer monitors the states of each circuit breaker accessory in real time through the bus interface circuit 21 and can perform power-off control on each circuit breaker accessory through the accessory control circuit 26 to avoid damage to individual accessories due to long-term power-on.

[0092] The present invention provides an independent breaker accessory protection module, which has an independent protection module housing and is installed in the breaker. It is connected to the breaker accessories inside the breaker through wires. Usually installed in the universal breaker, it provides monitoring and control functions for the existing breaker accessories in the universal breaker, such as under-voltage release, shunt release, closing electromagnet, and energy storage motor. It provides voltage detection function for the power supply of the breaker accessories through the accessory monitoring circuit, provides power detection function for the breaker accessories through the accessory monitoring circuit, and can cut off the power supply of the breaker accessories through the accessory control module, greatly improving the reliability of the existing breaker accessories. Without improving the existing breaker accessories, the monitoring and intelligent control of the breaker can be realized. In addition, a position detection circuit is provided, which cooperates with the corresponding switch set to detect whether the mechanical action of the breaker is in place, and can be fed back to the intelligent controller or the upper computer of the breaker through the bus interface circuit to realize the intelligent control of the breaker. In addition, a programmable logic interface circuit is also provided, which can be used to realize customized control to meet different requirements.

[0093] The above content is a further detailed description of the present invention and creation in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention and creation is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention and creation belong, without departing from the concept of the present invention and creation, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention and creation.

Claims

1. A circuit breaker, characterized in that: The circuit breaker includes an accessory protection module (2). The accessory protection module (2) has an independent protection module housing, is installed inside the circuit breaker and is connected to the circuit breaker accessories. The accessory protection module (2) includes a power supply circuit (22), a single-chip microcomputer circuit (23), an accessory monitoring circuit (24) and an accessory control circuit (26). The accessory monitoring circuit (24) and the accessory control circuit (26) are respectively connected to the single-chip microcomputer circuit (23). The power supply circuit (22) supplies power to the single-chip microcomputer circuit (23), the accessory monitoring circuit (24) and the accessory control circuit (26). The accessory monitoring circuit (24) is used to connect to the circuit breaker accessories and collect the operating voltage of the circuit breaker accessories. The single-chip microcomputer circuit (23) judges whether the circuit breaker accessories are faulty according to the operating voltage. The accessory control circuit (26) includes a relay connected to the power input terminal of the circuit breaker accessories. When the circuit breaker accessories are faulty, the single-chip microcomputer circuit (23) cuts off the power supply of the circuit breaker accessories through the relay of the accessory control circuit (26); The circuit breaker accessories include an under-voltage release (12), a shunt release (13), a closing electromagnet (14) and a storage motor (15). The accessory protection module (2) includes a plurality of accessory control circuits (26). The plurality of accessory control circuits (26) are respectively a shunt control circuit connected to the shunt release (13), a closing control circuit connected to the closing electromagnet (14) and a motor control circuit connected to the storage motor (15). The under-voltage release (12) is the first accessory, and the shunt release (13), the closing electromagnet (14) and the storage motor (15) are the second accessories. The accessory monitoring circuit (24) includes a first monitoring circuit for monitoring the operating voltage across the first accessory and a second monitoring circuit for monitoring the operating voltage across the second accessory. The first monitoring circuit and the second monitoring circuit are different.

2. The circuit breaker according to claim 1, wherein: The accessory protection module (2) further includes an accessory monitoring circuit (25) connected to the single-chip microcomputer circuit (23). The accessory monitoring circuit (25) is used to connect to the circuit breaker accessories and collect the operating current of the circuit breaker accessories.

3. The circuit breaker according to claim 2, characterized in that: The accessory monitoring circuit (25) includes a monitoring resistor connected in series with the circuit breaker accessories, and a voltage amplification circuit connected to both ends of the monitoring resistor. The voltage amplification circuit can amplify the voltage drop across the monitoring resistor and send it to the single-chip microcomputer circuit (23). The single-chip microcomputer circuit (23) calculates the operating current of the circuit breaker accessories to judge whether the circuit breaker accessories are working properly.

4. The circuit breaker according to claim 1, characterized in that: The accessory control circuit (26) includes a relay K1. One end of the normally closed contact of the relay K1 is connected to the live wire through the circuit breaker accessories, and the other end of the normally closed contact of the relay K1 is connected to the neutral wire through a resistor R53. A diode D8 is connected in parallel across both ends of the coil of the relay K1. One end of the coil of the relay K1 is connected to the power supply, and the other end of the coil of the relay K1 is connected to the collector of a triode Q1. The emitter of the triode Q1 is grounded, and the base of the triode Q1 is connected to the single-chip microcomputer circuit (23) through a resistor R52.

5. The circuit breaker according to claim 3, characterized in that: The voltage amplification circuit includes a first voltage amplification circuit and a second voltage amplification circuit. The first voltage amplification circuit is connected to both ends of the monitoring resistor. The second voltage amplification circuit is connected to the output end of the first voltage amplification circuit. The voltage drop across the monitoring resistor is amplified twice by the first voltage amplification circuit and the second voltage amplification circuit and then transmitted to the single-chip microcomputer chip (23).

6. The circuit breaker according to claim 5, wherein: The monitoring resistor is resistor R53. One end of resistor R53 is connected in series with relay K1 of the accessory control circuit (26). The first voltage amplification circuit includes operational amplifier U3AA, and the second voltage amplification circuit includes U3BB. The inverting input terminal and the non-inverting input terminal of operational amplifier U3AA are respectively connected to both ends of resistor R53 through resistor R48 and resistor R57. And the inverting input terminal of operational amplifier U3AA is connected to the output end of operational amplifier U3AA through resistor R41. The non-inverting input terminal of operational amplifier U3AA is connected to the voltage reference terminal through resistor R58. The inverting input terminal of operational amplifier U3BB is connected to the output end of operational amplifier U3AA through resistor R50. The non-inverting input terminal of operational amplifier U3BB is connected to the voltage reference terminal through resistor R56. The output end of operational amplifier U3BB is respectively connected to resistor R51 and resistor R42. The other end of resistor R51 is connected to the single-chip microcomputer circuit (23). The other end of resistor R42 is connected to the inverting input terminal of operational amplifier U3BB.

7. The circuit breaker according to claim 1, characterized in that: The accessory protection module (2) includes a drawer seat position detection circuit (28). The drawer seat position detection circuit (28) includes three microswitches respectively arranged at the separation position, the test position and the connection position, and three trigger detection circuits respectively connected to the three microswitches. The three trigger detection circuits are respectively connected to the single-chip microcomputer circuit (23).

8. The circuit breaker according to claim 2, characterized in that: It includes a plurality of accessory monitoring circuits (25). The plurality of accessory monitoring circuits (25) are used to respectively monitor a plurality of second accessories. The working principles of the plurality of accessory control circuits (26) are the same.

9. The circuit breaker according to claim 1, characterized in that: The second monitoring circuit includes an optocoupler U11. The optocoupler U11 includes a cooperating light-emitting diode and an output triode. The positive and negative electrodes of the light-emitting diode of the optocoupler U11 are the two input terminals of the optocoupler U11 respectively, and the two ends of the output triode are the two output terminals of the optocoupler U11 respectively. The positive electrode of the light-emitting diode of the optocoupler U11 is sequentially connected to the power input terminal of the second accessory through a resistor R77, a voltage-regulator diode DZ6, a resistor R78, a resistor R79, a resistor R80, and a diode D11. The negative electrode of the light-emitting diode of the optocoupler U11 is also connected to the power input terminal of the second accessory through a resistor R83. One end of the output triode of the optocoupler U11 is connected to the power supply circuit (22) through a resistor R81. The other end of the output triode of the optocoupler U11 is respectively connected to the input terminal of the single-chip microcomputer circuit (23) and a resistor R84, and the other end of the resistor R84 is grounded. The first monitoring circuit includes a differential amplifier circuit. The differential amplifier circuit includes an operational amplifier U3A. The output terminal of the operational amplifier U3A is connected to the input terminal of the single-chip microcomputer circuit (23) through a resistor R6. The non-inverting input terminal of the operational amplifier U3A is respectively connected to a resistor R1 and a resistor R2. The other end of the resistor R1 is grounded. The other end of the resistor R2 is sequentially connected to a resistor R3, a resistor R4, a resistor R5 and the negative electrode of a diode D2. The positive electrode of the diode D2 is connected to one input terminal of the differential amplifier circuit. The inverting input terminal of the operational amplifier U3A is respectively connected to a resistor R12 and a resistor R8. The other end of the resistor R12 is connected to the output terminal of the operational amplifier U3A. The other end of the resistor R8 is sequentially connected to a resistor R9, a resistor R10, a resistor R11 and the positive electrode of a diode D3. The negative electrode of the diode D3 is connected to the other input terminal of the differential amplifier circuit.

10. The circuit breaker according to claim 1, characterized in that: The power supply circuit (22) includes a filtering circuit, a DC / DC conversion circuit, and an LDO circuit; the filtering circuit includes a fuse F1 connected to the VIN+ input terminal of the power supply circuit (22), the other end of the fuse F1 is respectively connected to an inductor L1 and a varistor RV1, the other end of the varistor RV1 is connected to the VIN- input terminal of the power supply circuit (22), the other end of the inductor L1 is connected to the anode of a diode D4, the cathode of the diode D4 is respectively connected to the anode of an electrolytic capacitor C5 and the anode of a ceramic capacitor C2, the cathode of the electrolytic capacitor C5 and the cathode of the ceramic capacitor C2 are respectively connected to the VIN- input terminal of the power supply circuit (22); the DC / DC conversion circuit includes a chip U1, the first pin and the third pin of the chip U1 are respectively connected to the VIN+ output terminal of the power supply circuit (22) and the VIN- output terminal of the power supply circuit 22 through the filtering circuit, the second pin of the chip U1 is respectively connected to a fast recovery diode DZ1 and an inductor L2, the other end of the fast recovery diode DZ1 is grounded, the other end of the inductor L2 and the electrolytic capacitor C7, the ceramic capacitor C6, and a transient suppression diode TVS1 are respectively connected to the fourth pin of the chip U1, the fifth pin of the chip U1 is grounded; the LDO circuit includes a chip U4, the first pin of the chip U4 is connected to the fourth pin of the chip U1, the fifth pin of the chip U4 is respectively connected to a capacitor C3, a capacitor C4, and the output terminal of the power supply circuit (22), and the other ends of the capacitor C3 and the capacitor C4 are respectively grounded.

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