breaker

Abstract

A circuit breaker accessory protection module is used to connect to the circuit breaker accessories of the circuit breaker, characterized in that the accessory protection module includes a power supply circuit, a single-chip microcomputer circuit, an accessory monitoring circuit and a programmable logic interface circuit, the power supply circuit supplies power to the single-chip microcomputer circuit, the accessory monitoring circuit and the programmable logic interface circuit, the accessory monitoring circuit is used to connect the circuit breaker accessories and collect the working voltage of the circuit breaker accessories, the single-chip microcomputer circuit determines whether the circuit breaker accessories are faulty according to the working voltage, the programmable logic interface circuit 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, the single-chip microcomputer circuit can identify the input signal of the DI input detection circuit, and the single-chip microcomputer circuit can control the output signal of the DO output circuit, and the user can make a variety of customized settings through the programmable logic interface circuit 29.

Description

Technical Field

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

[0002] Existing universal circuit breakers need to be equipped with corresponding circuit breaker accessories (such as undervoltage release, shunt release, closing electromagnet, energy storage motor) when in use in order to be applied in electrical automation. The automatic undervoltage tripping, electric opening, electric closing and electric energy storage functions can be realized through various circuit breaker accessories.

[0003] However, circuit breaker accessories only realize their own corresponding functions. If their functions fail, they can only be discovered during on-site operation or regular maintenance. They cannot meet the requirements of rapid response after product failure. In addition, the position status of the drawer seat needs to be manually confirmed, which is time-consuming and labor-intensive and may result in missed detection or misjudgment. Summary of the invention

[0004] The purpose of the invention is to overcome the defects of the prior art and provide a circuit breaker accessory protection module with a programmable logic controller interface.

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

[0006] A circuit breaker includes an accessory protection module, wherein the accessory protection module has an independent protection module housing, is installed in the circuit breaker and is connected to a circuit breaker accessory of the circuit breaker, wherein the accessory protection module includes a power supply circuit, a single-chip computer circuit, an accessory monitoring circuit and a programmable logic interface circuit, wherein the power supply circuit supplies power to the single-chip computer circuit, the accessory monitoring circuit and the programmable logic interface circuit, wherein the accessory monitoring circuit is used to connect the circuit breaker accessory and collect the working voltage of the circuit breaker accessory, wherein the single-chip computer circuit determines whether the circuit breaker accessory is faulty according to the working voltage, wherein the programmable logic interface circuit includes a DI input detection circuit and a DO output circuit, wherein 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 computer circuit, wherein the single-chip computer circuit can identify the input signal of the DI input detection circuit, and wherein the single-chip computer circuit can control the output signal of the DO output circuit; wherein the circuit breaker accessory of the circuit breaker is a first accessory or a second accessory, wherein the accessory monitoring circuit includes a first monitoring circuit for monitoring the working voltage at both ends of the first accessory and a second monitoring circuit for monitoring the working voltage at both ends of the second accessory, wherein the second accessory is a shunt release, a closing electromagnet or an energy storage motor, and wherein the first accessory is an undervoltage release.

[0007] Preferably, the accessory protection module also includes a drawer seat position detection circuit, which includes three micro switches respectively arranged at a separation position, a test position and a connection position, and three trigger detection circuits respectively connected to the three micro switches, and the three trigger detection circuits are respectively connected to the single-chip computer circuit.

[0008] Preferably, the accessory protection module also includes a switch state detection circuit connected to the single-chip microcomputer circuit, the switch state detection circuit is used to connect the switch state microswitch of the circuit breaker body, the switch state microswitch cooperates with the main contact of the circuit breaker body to indicate the position of the main contact and transmit it to the single-chip microcomputer circuit.

[0009] Preferably, the accessory protection module also includes an accessory control circuit connected to the single-chip computer circuit, the accessory control circuit includes a relay connected to the power input terminal of the circuit breaker accessory, and when the circuit breaker accessory fails, the single-chip computer circuit controls the circuit breaker accessory to cut off power through the relay of the accessory control circuit.

[0010] Preferably, the accessory protection module also includes an accessory monitoring circuit connected to the single-chip microcomputer circuit, the accessory monitoring 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, and the operating current of the circuit breaker accessory is calculated through the single-chip microcomputer circuit to determine whether the circuit breaker accessory is working normally.

[0011] Preferably, the DI input detection circuit includes an optocoupler U30, which includes a matching light-emitting diode and an output transistor. The positive electrode of the light-emitting diode of the optocoupler U30 is connected to the J7 input terminal of the DI input detection circuit through resistors R32, R33, R34, R35, R36 and R37 in sequence, and the negative electrode 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 transistor of the optocoupler U30 is connected to the power supply circuit, and the other end of the output transistor of the optocoupler U30 is respectively connected to the IO port of the single-chip circuit and resistor R25, and the other end of the resistor R25 is grounded.

[0012] Preferably, the DO output circuit includes a relay K4, a transistor Q30 and an optocoupler U90, the two ends of the normally open contact of the relay K4 are respectively connected to the two output ends of the DO output circuit, the transistor Q30 and the coil of the relay K4 are connected in series with the power supply, and the optocoupler U90 can turn on the transistor Q30 through the base of the transistor Q30, so that the coil of the relay K4 is energized.

[0013] Preferably, the optocoupler U90 includes a matching light-emitting diode and an output transistor, one end of the light-emitting diode of the optocoupler U90 is connected to the power supply circuit through a resistor R800, the other end of the light-emitting diode of the optocoupler U90 is connected to the I / O of the single-chip circuit, the E pole of the output transistor of the optocoupler U90 is grounded, the collector of the output transistor of the optocoupler U90 is connected to the base of the transistor Q30, one end of the coil of the relay K4 is respectively connected to the power supply, the positive pole of the diode D30 and the resistor R30, the other end of the coil of the relay K4 is respectively connected to the collector of the transistor Q30 and the negative pole of the diode D30, the other end of the resistor R30 is connected to the base of the transistor Q30, and the emitter of the transistor Q30 is grounded.

[0014] Preferably, the trigger detection circuit includes an optocoupler U11, which includes a matching light-emitting diode and an output transistor. The positive and negative electrodes of the light-emitting diode of the optocoupler U11 are respectively the two input ends of the optocoupler U11, and the two ends of the output transistor are respectively the two output ends of the optocoupler U11. The positive electrode of the light-emitting diode of the optocoupler U11 passes through resistor R77, voltage-stabilizing diode DZ6, resistor R78, resistor R79, resistor R80 and diode D11 in sequence, and the negative electrode of the light-emitting diode of the optocoupler U11 passes through resistor R83 and is respectively connected to the neutral line of the micro switch. One end of the output transistor of the optocoupler U11 is connected to the power supply circuit through resistor R81, and the other end of the output transistor of the optocoupler U11 is respectively connected to the input end of the single-chip circuit and resistor R84, and the other end of resistor R84 is grounded.

[0015] Preferably, it includes multiple circuit breaker accessories, the multiple circuit breaker accessories are respectively the first accessories or the second accessories, the accessory monitoring circuit includes a first monitoring circuit for monitoring the working voltage at both ends of the first accessory and a second monitoring circuit for monitoring the working voltage at both ends of the second accessory; it includes multiple accessory control circuits and multiple accessory monitoring circuits, the multiple accessory control circuits are used to control multiple second accessories respectively, the multiple accessory monitoring circuits are used to monitor multiple second accessories respectively, the multiple second accessories are respectively shunt releases, closing electromagnets and energy storage motors, and the working principles of the multiple accessory control circuits are the same; the accessory protection module also includes a drawer seat position detection circuit, the drawer seat position detection circuit includes a micro switch and a trigger detection circuit connected to the micro switch, and the second monitoring circuit has the same working principle as the trigger detection circuit.

[0016] The circuit breaker accessory protection module created by the present invention has a single-chip microcomputer circuit that can identify the input signal of the DI input detection circuit and control the output signal of the DO output circuit, so that the user can perform a variety of customized settings through the programmable logic interface circuit, which not only reduces the difficulty of installation, maintenance and debugging, but also makes it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the attachment protection module in the first embodiment of the present invention;

[0018] Figure 2 This is the first working mode of the first embodiment of the present invention;

[0019] Figure 3 is a circuit diagram of a first monitoring circuit according to an embodiment of the present invention;

[0020] Figure 4 is a circuit diagram of a second monitoring circuit according to an embodiment of the present invention;

[0021] Figure 5 It is a circuit diagram of a single chip microcomputer circuit according to an embodiment of the present invention;

[0022] Figure 6 1 is a circuit diagram of a power supply circuit according to an embodiment of the present invention;

[0023] Figure 7 1 is a circuit diagram of a bus interface circuit according to an embodiment of the present invention;

[0024] Figure 8 It is a circuit diagram of an LED indicator circuit according to an embodiment of the present invention;

[0025] Fig. 9 It is a structural diagram of the attachment protection module in the second embodiment of the present invention;

[0026] Fig.10 This is the first working mode of the second embodiment of the present invention;

[0027] Fig.11 This is the second working mode of the second embodiment of the present invention;

[0028] Fig.12 It is a circuit diagram of an accessory monitoring circuit and an accessory control circuit according to an embodiment of the present invention;

[0029] Fig.13 It is a structural diagram of the attachment protection module in the third embodiment of the present invention;

[0030] Fig.14 This is the first working mode of the third embodiment of the present invention;

[0031] Fig.15 This is the second working mode of the third embodiment of the present invention;

[0032] Fig.16 1 is a circuit diagram of a DI input detection circuit according to an embodiment of the present invention;

[0033] Fig.17 1 is a circuit diagram of a DO output circuit according to an embodiment of the present invention;

[0034] Fig.18 It is a circuit diagram of a switch state detection circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The following is combined with Figures 1 to 18 The given embodiments further illustrate the specific implementation of the circuit breaker accessory protection module created by the present invention. The circuit breaker accessory protection module created by the present invention is not limited to the description of the following embodiments.

[0036] like Figure 1 , 2 As shown, the circuit breaker created by the present invention includes a drawer seat and a circuit breaker body 1 and an accessory protection module 2 arranged in the drawer seat. The circuit breaker body 1 includes an intelligent controller 11 and a circuit breaker accessory. The accessory protection module 2 includes a power supply circuit 22, a single-chip circuit 23 and an accessory monitoring circuit 24. The accessory monitoring circuit 24 is connected to the single-chip circuit 23. The power supply circuit 22 supplies power to the single-chip circuit 23 and the accessory monitoring circuit 24. The accessory monitoring circuit 24 is used to connect the circuit breaker accessories and collect the working voltage of the circuit breaker accessories. The single-chip circuit 23 determines whether the circuit breaker accessories are faulty according to the working voltage.

[0037] The circuit breaker accessory protection module created by the present invention monitors the working voltage of the circuit breaker accessories through the accessory monitoring circuit 24, and calculates the working state of the circuit breaker accessories through the single-chip computer circuit 23, and can respond in time if the circuit breaker accessories fail.

[0038] Furthermore, the accessory protection module 2 is an independent module, and the accessory protection module 2 also includes a bus interface circuit 21 connected to the single-chip circuit 23, and the bus interface circuit 21 is used to connect with the intelligent controller 11 or the client host of the circuit breaker body 1. The intelligent controller 11 or the client host can obtain the working state of the circuit breaker accessories in the single-chip circuit 23 through the bus interface circuit 21, so that the intelligent controller 11 can automatically check the circuit breaker accessories according to the information of the accessory protection module 2 when working.

[0039] Furthermore, the accessory protection module 2 further includes an LED indication circuit 20 connected to the single-chip computer circuit 23 , and the single-chip computer circuit 23 can indicate the working status of the circuit breaker accessory through the LED indication circuit 20 .

[0040] like Figure 2An embodiment of the accessory protection module 2 is shown, the circuit breaker body 1 includes a plurality of circuit breaker accessories, the plurality of circuit breaker accessories are respectively the first accessories or the second accessories, and the accessory monitoring circuit 24 includes a first monitoring circuit for monitoring the working voltage at both ends of the first accessory and a second monitoring circuit for monitoring the working voltage at both ends of the second accessory. Of course, the plurality of circuit breaker accessories may also all be the first accessories, or all be the second accessories, and both belong to the protection scope of the invention.

[0041] Further, 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 computer circuit 23. The single-chip computer circuit 23 is used to determine whether the first accessory is faulty. The single-chip computer circuit 23 includes an MCU and an A / D converter. The differential amplifier circuit converts the voltage signal at the power end of the first accessory into a proportional AD signal. The single-chip computer circuit 23 obtains a voltage effective value based on the signal of the accessory monitoring circuit 24, and determines whether the first accessory is faulty based on the obtained voltage effective value.

[0042] Furthermore, the second monitoring circuit includes an optocoupler, and two input ends of the optocoupler are respectively connected to the power input end of the second accessory, and are used to monitor whether the circuit breaker accessory has an operating voltage. The two output ends of the optocoupler are respectively connected to the input ends of the microcontroller circuit 23 and the power supply circuit 22. The two input ends of the optocoupler can be turned on when there is an operating voltage in the second accessory, and a path is formed between the two input ends of the optocoupler, so that the power supply circuit 22 outputs a signal to the microcontroller circuit 23 through the two input ends of the optocoupler.

[0043] like Figure 2 , 3A preferred embodiment of the first monitoring circuit is shown, wherein the first accessory is an undervoltage release 12, and the first monitoring circuit is an undervoltage monitoring circuit 244. The first monitoring circuit includes a differential amplifier circuit, and the differential amplifier circuit includes an operational amplifier U3A. The output end of the operational amplifier U3A is connected to the input end of the single-chip circuit 23 through a resistor R6, and the in-phase input end of the operational amplifier U3A is connected to resistors R1 and R2 respectively. The other end of the resistor R1 is grounded, and the other end of the resistor R2 is connected to the negative electrode of the diode D2 through resistors R3, R4, and R5 in sequence. The positive electrode of the diode D2 is connected to one input end of the differential amplifier circuit, and the negative input end of the operational amplifier U3A is connected to resistors R12 and R8 respectively. The other end of the resistor R12 is connected to the output end of the operational amplifier U3A, and the other end of the resistor R8 is connected to the positive electrode of the diode D3 through resistors R9, R10, and R11 in sequence. The negative electrode of the diode D3 is connected to the other input end of the differential amplifier circuit. Generally, the action characteristic of the undervoltage release is that it can be reliably released when the voltage at the power supply end is 0.35Ue, and can be reliably attracted when the voltage at the power supply end is 0.7Ue. The single-chip computer circuit 23 compares the voltage effective value obtained from the signal of the accessory monitoring circuit 24 with the preset undervoltage threshold to determine whether the undervoltage release 12 has a fault. If the voltage effective value is lower than the minimum undervoltage threshold, it is considered that there is a fault.

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

[0045] like Figure 2 , 4 A preferred embodiment of the second monitoring circuit is shown, including multiple second accessories and multiple second monitoring circuits. The working principles of the multiple second monitoring circuits are the same. For example, the multiple second accessories are respectively a shunt release 13, a closing electromagnet 14 and an energy storage motor 15, and the multiple second monitoring circuits are respectively a shunt monitoring circuit 245 connected to the shunt release 13, a closing monitoring circuit 246 connected to the closing electromagnet 14 and a motor monitoring circuit 247 connected to the energy storage motor 15.

[0046] The second monitoring circuit includes an optocoupler U11, which includes a matching light-emitting diode and an output transistor. The positive electrode and the negative electrode of the light-emitting diode of the optocoupler U11 are respectively the two input ends of the optocoupler U11, and the two ends of the output transistor are respectively the two output ends of the optocoupler U11. The positive electrode of the light-emitting diode of the optocoupler U11 is connected to the power input end of the second accessory through resistor R77, voltage-stabilizing diode DZ6, resistor R78, resistor R79, resistor R80 and diode D11 in sequence, and the negative electrode of the light-emitting diode of the optocoupler U11 is also connected to the power input end of the second accessory through resistor R83. One end of the output transistor of the optocoupler U11 is connected to the power supply circuit 22 through resistor R81, and the other end of the output transistor of the optocoupler U11 is respectively connected to the input end of the single-chip circuit 23 and resistor R84, and the other end of the resistor R84 is grounded.

[0047] Furthermore, the second monitoring circuit also includes a resistor R82 and a capacitor C19 connected in parallel, one end of the resistor R82 and the capacitor C19 connected in parallel is connected to the positive electrode of the voltage zener diode DZ6, and the other end of the resistor R82 and the capacitor C19 connected in parallel is connected to the resistor R83.

[0048] The shunt monitoring circuit 245, the closing monitoring circuit 246 and the motor monitoring circuit 247 have the same working principle and 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 the corresponding circuit breaker accessories.

[0049] like Figure 5 A preferred embodiment of the single-chip microcomputer circuit 23 is shown, wherein 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 an oscillation pulse so that the chip U5 can run in an orderly manner according to the oscillation rhythm. The reset circuit can form an integration circuit to generate a reset pulse at the moment of power-on to reset the chip U5.

[0050] Furthermore, the oscillation circuit includes a crystal oscillator X1, one end of the crystal oscillator X1 is respectively connected to the capacitor C11 and the PFO terminal of the chip U5, the other end of the crystal oscillator X1 is respectively connected to the capacitor C14 and the PF1 terminal of the chip U5, and 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] like Figure 6A preferred embodiment of the power supply circuit 22 is shown, and 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 VI N+ input terminal of the power supply circuit 22, the other end of the fuse F1 is respectively connected to the inductor L1 and the varistor RV1, the other end of the varistor RV1 is connected to the VI N- input terminal of the power supply circuit 22, the other end of the inductor L1 is connected to the positive electrode of the diode D4, the negative electrode of the diode D4 is respectively connected to the positive electrode of the electrolytic capacitor C5 and one end of the ceramic capacitor C2, and the negative electrode of the electrolytic capacitor C5 and the other end of the ceramic capacitor C2 are respectively connected to the VI N- input terminal of the power supply circuit 22.

[0052] The DC\DC conversion circuit includes a chip U1, which is preferably an LM2575 integrated circuit. The first pin (Vi n) and the third pin (GND) of the chip U1 are respectively connected to the VI N+ output terminal of the power supply circuit 22 and the VI N- output terminal of the power supply circuit 22 through a filtering circuit. The second pin (Vout) of the chip U1 is respectively connected to the fast recovery diode DZ1 and the inductor L2. The other end of the fast recovery diode DZ1 is grounded, and the other end of the inductor L2 and the electrolytic capacitor C7, the ceramic capacitor C6 and the 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 always in an enabled state.

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

[0054] like Figure 7 The preferred embodiment of the bus interface circuit 21 is shown. The bus interface circuit 21 adopts the isolated RS485 type. The bus interface circuit 21 includes a chip U2. 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 the B- output terminal. Of course, the bus interface circuit 21 can also be a CAN or Profibus bus type from RS485, which belongs to the protection scope of the invention.

[0055] like Figure 8 A preferred embodiment of the LED indication circuit 20 is shown. The LED indication circuit 20 includes a plurality of light emitting diodes, one end of each of which is connected to a power supply circuit 22, and the other end of each of which is connected to a single-chip computer circuit 23 through a resistor. Terminals different from the single-chip computer circuit 23 are connected to indicate the status of different circuit breaker accessories. When the single-chip computer circuit 23 outputs a high level, the light emitting diode emits light, and when the single-chip computer circuit 23 outputs a low level, the light emitting diode turns off.

[0056] Embodiment 1

[0057] like Figure 1 As shown, the accessory protection module 2 includes an undervoltage monitoring circuit 244, a shunt monitoring circuit 245, a closing monitoring circuit 246 and a motor monitoring circuit 247 respectively connected to the single-chip circuit 23, and 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 circuit 23 and is used to detect the opening and closing state of the circuit breaker body 1. Usually, the position detection circuit 240 cooperates with a micro switch to detect the position of the mechanical action in the circuit breaker to confirm whether the action is in place. The position detection circuit 240 is connected to the micro switch to provide a signal to the single-chip circuit 23.

[0058] like Figure 2 The 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 feeds it back to the single-chip circuit 23 for storage. The intelligent controller 11 queries (accesses) the circuit breaker accessory status information in the single-chip circuit 23 at intervals (such as 1 second). The intelligent controller 11 processes the query result in advance and transmits it to the background monitoring software through the external bus.

[0059] Embodiment 2

[0060] like Fig. 9 As shown, the accessory protection module 2 includes an accessory monitoring circuit 24 connected to the single-chip computer circuit 23, and also includes an accessory control circuit 26 connected to the single-chip computer circuit 23. The accessory control circuit 26 includes a relay connected to the power input terminal of the circuit breaker accessory. When the circuit breaker accessory fails, the single-chip computer circuit 23 controls the circuit breaker accessory to cut off the power through the relay of the accessory control circuit 26.

[0061] The accessory protection module 2 cooperates with the circuit breaker accessory through the accessory control circuit 26. When the circuit breaker accessory fails, the circuit breaker accessory is powered off to prevent damage caused by long-term power-on when the circuit breaker accessory fails. For example, it can prevent equipment such as the energy storage motor 15 of the circuit breaker from being damaged due to long-term power-on.

[0062] Furthermore, the accessory protection module 2 also includes an accessory monitoring circuit 25, which is connected to the single-chip circuit 23 and the circuit breaker accessory, and is used to connect the circuit breaker accessory and collect the working current of the circuit breaker accessory. The accessory monitoring circuit 25 includes a monitoring resistor connected in series with the circuit breaker accessory, and a voltage amplifier circuit connected to both ends of the monitoring resistor. The voltage amplifier circuit can amplify the voltage drop across the monitoring resistor and send it to the single-chip circuit 23. The single-chip circuit 23 calculates the working current of the circuit breaker accessory based on the signal provided by the accessory monitoring circuit 25, and determines whether the circuit breaker accessory is working normally. If the circuit breaker accessory is connected normally and there is no disconnection, a working current is generated; otherwise, if the circuit breaker accessory is disconnected, no working current is generated, and the circuit breaker accessory is faulty.

[0063] The function of the accessory monitoring circuit 24 is to collect the voltage across the circuit breaker accessories (such as the closed electromagnet), while the function of the accessory monitoring circuit 25 is to collect the current (flowing through the electromagnet). For example, the input terminal 31 and the input terminal 32 of the accessory monitoring circuit 24 are respectively connected to the two terminals of the electromagnet coil of the closed 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, so that the electromagnet coil is connected in series to the power supply voltage, which plays the role of collecting the current of the electromagnet coil. When it is detected that the electromagnetic coil is energized for a long time, the coil loop can be disconnected from the power supply through the accessory control circuit 26, which has the benefit of protecting the coil from overheating and damage.

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

[0065] like Fig. 9 , 10 As shown, this embodiment includes multiple circuit breaker accessories and multiple accessory control circuits 26, the multiple circuit breaker accessories are respectively first accessories or second accessories, the multiple accessory control circuits 26 are used to control multiple second accessories respectively, and the working principles of the multiple accessory control circuits 26 are the same.

[0066] The multiple second accessories are respectively a shunt release 13, a closing electromagnet 14 and an energy storage motor 15, and the multiple 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 energy storage motor 15. The shunt control circuit, the closing control circuit and the motor control circuit have the same working principle and are only used to control different circuit 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 terminal of the corresponding circuit breaker accessories.

[0067] Furthermore, it includes multiple accessory monitoring circuits 25, which are used to monitor multiple second accessories respectively, and the working principles of the multiple accessory monitoring circuits 25 are the same. The multiple accessory monitoring circuits 25 are respectively the shunt monitoring circuit of the release connected to the shunt control circuit, the closing monitoring circuit of the release connected to the closing control circuit, and the motor control circuit of the release connected to the motor control circuit. The working principles of the shunt monitoring circuit, the monitoring circuit and the motor control circuit are the same and are only used to monitor different circuit breaker accessories. The input ends of the voltage amplifier 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] like Fig.12 A preferred embodiment of the accessory control circuit 26 and the accessory monitoring circuit 25 is shown, wherein 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 via the circuit breaker accessory, the other end of the normally closed contact of the relay K1 is connected to the neutral wire via a resistor R53, a diode D8 is connected in parallel to both ends of the coil of the relay K1, one end of the coil of the relay K1 is connected to the power supply, the other end of the coil of the relay K1 is connected to the collector of the transistor Q1, the emitter of the transistor Q1 is grounded, and the base of the transistor Q1 is connected to the microcontroller circuit 23 via a resistor R52.

[0069] In this embodiment, the power supply of the circuit breaker accessories is controlled by the relay K1. When the single-chip computer circuit 23 outputs a high level, the normally closed contact of the relay K1 is disconnected, and the circuit breaker accessories lose power. When the single-chip computer circuit 23 outputs a low level, the normally closed contact of the relay K1 is closed, and the circuit breaker accessories are powered.

[0070] like Fig.12 A preferred embodiment of the accessory monitoring circuit 25 is shown, wherein the accessory monitoring circuit 25 includes a monitoring resistor and a voltage amplifier circuit, wherein the voltage amplifier circuit includes a first voltage amplifier circuit and a second voltage amplifier circuit, wherein the first voltage amplifier circuit is connected to both ends of the monitoring resistor, and the second voltage amplifier circuit is connected to the output end of the first voltage amplifier circuit, and the voltage drop across the monitoring resistor is amplified twice by the first voltage amplifier circuit and the second voltage amplifier circuit and then transmitted to the single-chip computer 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 amplifier circuit includes an operational amplifier U3AA, and the second voltage amplifier circuit includes an operational amplifier U3BB. The inverting input terminal and the non-inverting input terminal of the operational amplifier U3AA are connected to the two ends of the resistor R53 through resistors R48 and R57 respectively, and the inverting input terminal of the operational amplifier U3AA is connected to the output terminal of the operational amplifier U3AA through resistor R41, and the non-inverting input terminal of the operational amplifier U3AA is connected to the voltage reference terminal (1.5V) through resistor R58; the inverting input terminal of the operational amplifier U3BB is connected to the output terminal of the operational amplifier U3AA through resistor R50, and the non-inverting input terminal of the operational amplifier U3BB is connected to the voltage reference terminal (1.5V) through resistor R56, and the output terminal of the operational amplifier U3BB is respectively connected to resistors R51 and R42, the other end of the resistor R51 is connected to the single-chip 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, the current passes through the resistor R53, so that there is a voltage drop across the resistor R53. The voltage drop is amplified by a two-stage operational amplifier, and the amplified signal is input to the AD port of the single-chip computer circuit 23. The single-chip computer circuit 23 calculates the working current of the circuit breaker accessory based on the AD signal obtained from the accessory monitoring circuit 25, and judges whether the circuit breaker accessory is working normally, for example, whether it is closed normally.

[0074] like Fig.10 The 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 circuit 23 for storage. The intelligent controller 11 queries (accesses) the circuit breaker accessory status information in the single-chip circuit 23 at intervals (such as 1 second). The intelligent controller 11 processes the query result in advance and then transmits it to the background monitoring software through the external bus. The background monitoring software can be a cloud service, or a host PC, or a mobile phone APP, etc.

[0075] like Fig.11 The second working mode of the accessory protection module 2 is shown. 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 status of each circuit breaker accessory in real time through the bus interface circuit 21, and can control the power-off of each circuit breaker accessory through the accessory control circuit 26 to avoid damage to individual accessories due to long-term power-on.

[0076] Embodiment 3

[0077] like Fig.13 As shown, the accessory protection module 2 also includes a programmable logic interface circuit 29, which 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 computer circuit 23, and 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 computer circuit 23 can identify the input signal of the DI input detection circuit, and the single-chip computer circuit 23 can control the output signal of the DO output circuit.

[0078] The single-chip microcomputer circuit 23 can identify the input signal of the DI input detection circuit and control the output signal of the DO output circuit. The user can make various customized settings through the programmable logic interface circuit 29, such as controlling the action of the relay K4 of the DO output circuit through the serial port instructions sent by the intelligent controller 11, realizing the circuit breaker area interlocking, remote opening and closing and other functions, which can not only reduce the difficulty of installation, maintenance and debugging, but also make it more convenient to use.

[0079] Furthermore, the accessory protection module 2 also includes a drawer seat position detection circuit 28. When the circuit breaker body 1 is in use, it needs to move between the separation position, the test position and the connection position of the drawer seat to disconnect, test and connect the circuit breaker body 1. The drawer seat position detection circuit 28 includes three micro switches respectively arranged at the separation position, the test position and the connection position, and three trigger detection circuits respectively connected to the three micro switches. The three trigger detection circuits are respectively connected to the single-chip circuit 23. When the circuit breaker body 1 moves to the separation position, the test position and the connection position, the micro switches at the corresponding positions are triggered, and the trigger detection circuit outputs a signal to the single-chip circuit 23 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] Furthermore, the accessory protection module 2 also includes a switch state detection circuit 27 connected to the single-chip circuit 23. The switch state detection circuit 27 is used to connect the switch state micro switch of the circuit breaker body 1. The switch state micro switch cooperates with the main contact of the circuit breaker body 1 to indicate the position of the main contact and transmit it to the single-chip circuit 23. The closing and opening states of the circuit breaker are monitored by the switch state micro switch. When the circuit breaker body 1 is closed, the switch state micro switch remains on; when the circuit breaker body 1 is opened, the switch state micro switch remains off. The switch state micro switch is installed on the circuit breaker body, and its working state is the same as the state of the circuit breaker main contact, that is, when the circuit breaker is closed, it can trigger the switch state micro switch to keep it on, and when the circuit breaker is opened, the switch state micro switch remains off.

[0081] like Fig.18 As shown, the switch state detection circuit 27 has the same working principle as 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 micro switch 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 micro switch WD1 is closed, the PB1 point of the optocoupler output is a high level; when the micro switch is disconnected, the PB1 point of the optocoupler output is a low level.

[0082] like Fig.16 A preferred embodiment of a DI input detection circuit is shown. 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 matching light-emitting diode and an output transistor. The positive electrode of the light-emitting diode of the optocoupler U30 is connected to the J7 input terminal of the DI input detection circuit through resistors R32, R33, R34, R35, R36 and R37 in sequence, and the negative electrode 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 transistor of the optocoupler U30 is connected to the power supply circuit 22, and the other end of the output transistor of the optocoupler U30 is respectively connected to the IO port of the single-chip microcomputer circuit 23 and resistor R25, and the other end of the resistor R25 is grounded. Users can make a variety of customized settings through the DO output circuit output. The DO output circuit can also be used to output the working status of the circuit breaker accessories, such as the working status of the circuit breaker accessories, output fault signals when the circuit breaker accessories fail, and can also be used to control signals of other circuit breakers to achieve regional interlocking and other functions.

[0083] The voltage state detection circuit is formed by the optocoupler U30. When there is voltage on the external input, the E pole of the output transistor of the optocoupler U30 is at a high level, otherwise it is 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 transistor of the optocoupler U30. The figure only shows one path, and in actual application, multiple DI input detection circuits can be connected to the single-chip microcomputer circuit 23 respectively.

[0084] like Fig.17 The preferred embodiment of the DO output circuit is shown, and the DO output circuit includes a relay K4, a transistor Q30 and an optical coupler U90. The two ends of the normally open contact of the relay K4 are respectively connected to the two output ends of the DO output circuit. The transistor Q30 and the coil of the relay K4 are connected in series with the power supply. The optical coupler U90 can turn on the transistor Q30 through the base of the transistor Q30, so that the coil of the relay K4 is energized to attract the normally open contact of the relay K4 to operate.

[0085] The optocoupler U90 includes a matching light emitting diode and an output transistor. One end of the light emitting diode of the optocoupler U90 is connected to the power supply circuit 22 through the resistor R800, and the other end of the light emitting diode of the optocoupler U90 is connected to the I / O of the single-chip circuit 23. The E pole of the output transistor of the optocoupler U90 is grounded, and the collector of the output transistor of the optocoupler U90 is connected to the base of the transistor Q30. One end of the coil of the relay K4 is respectively connected to the power supply, the positive pole of the diode D30 and the resistor R30, and the other end of the coil of the relay K4 is respectively connected to the collector of the transistor Q30 and the negative pole of the diode D30, and the other end of the resistor R30 is connected to the base of the transistor Q30, and the emitter of the transistor Q30 is grounded. When the I\O port of the single-chip circuit 23 outputs a high level, the normally open contact of the relay K4 is closed, otherwise the normally open contact of K4 is disconnected. The figure only shows one channel, and the actual application can be a multi-channel DO output circuit.

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

[0087] When the circuit breaker body 1 moves to the separation position, the test position and the connection position, the micro switches at the corresponding positions can be triggered respectively, and the detection trigger circuit outputs a signal to the single-chip circuit 23. When the detection trigger circuit of the separation position outputs a signal to the single-chip circuit 23, it indicates that the circuit breaker body 1 moves to the separation position, and the same is true for the test position and the connection position.

[0088] See also Figure 4 A preferred embodiment of the trigger detection circuit is shown. The trigger detection circuit of this embodiment is the same as the second monitoring circuit, that is, the working principles of the separation trigger circuit, the test trigger circuit and the connection trigger circuit, except that the input end of the second monitoring circuit is connected to the power input end of the circuit breaker accessory to detect whether there is a voltage at the power input end of the circuit breaker accessory, and the positive and negative electrodes of the light emitting diode of the optocoupler U11 of the trigger detection circuit are respectively connected to the neutral line of the micro switch, that is, the positive electrode of the light emitting diode of the optocoupler U11 passes through the resistor R77, the voltage stabilizing diode DZ6, the resistor R78, the resistor R79, the resistor R80 and the diode D11 in sequence, and the negative electrode of the light emitting diode of the optocoupler U11 passes through the resistor R83 to be connected to the neutral line of the micro switch respectively, for detecting whether there is a voltage at the neutral line of the micro switch. When the circuit breaker body 1 moves to the separation position, the test position and the connection position, the corresponding micro switch is triggered. When the micro switch is actuated, a current can be formed between the diode D11 and the resistor R83 of the corresponding second monitoring circuit, so that the light-emitting diode of the optocoupler U11 emits light and turns on the output transistor of the optocoupler U11, and then the signal is output to the single-chip circuit 23 through the output transistor of U11. If the output transistor of the optocoupler U11 in the separation position outputs the signal to the single-chip circuit 23, it means that the circuit breaker body 1 moves to the separation position, and the same applies to the test position and the connection position.

[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 is connected to the single-chip microcomputer circuit 23 to monitor the state of the circuit breaker switch in real time.

[0090] like Fig.14 The 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 circuit 23 for storage. The intelligent controller 11 queries (accesses) the circuit breaker accessory status information in the single-chip circuit 23 at intervals (such as 1 second). The intelligent controller 11 processes the query result in advance and transmits it to the background monitoring software through the external bus.

[0091] like Fig.15The second working mode of the accessory protection module 2 is shown. 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 status of each circuit breaker accessory in real time through the bus interface circuit 21, and can control the power-off of 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 circuit breaker accessory protection module, which has an independent protection module housing, is installed in the circuit breaker, and is connected to the circuit breaker accessories in the circuit breaker through a wire. It is usually installed in a universal circuit breaker to provide monitoring and control functions for the circuit breaker accessories of the existing universal circuit breaker, such as undervoltage release, shunt release, closing electromagnet, and energy storage motor. The voltage detection function of the power supply is provided for the circuit breaker accessories through the accessory monitoring circuit, and the power supply detection function is provided for the circuit breaker accessories through the accessory monitoring circuit. The power supply of the circuit breaker accessories can be disconnected through the accessory control module, which greatly improves the reliability of the existing circuit breaker accessories. The monitoring and intelligent control of the circuit breaker can be realized without improving the existing circuit breaker accessories. In addition, a position detection circuit is also provided, which cooperates with the corresponding switch to detect whether the mechanical action of the circuit breaker is in place, and can be fed back to the intelligent controller or host computer of the circuit breaker through the bus interface circuit to realize the intelligent control of the circuit breaker. In addition, a programmable logic interface circuit is also provided to realize customized control to meet different needs.

[0093] The above content is a further detailed description of the invention in combination with specific preferred implementation methods, and it cannot be determined that the specific implementation of the invention is limited to these descriptions. For ordinary technicians in the technical field to which the invention belongs, several simple deductions or substitutions can be made without departing from the concept of the invention, which should be regarded as falling within the scope of protection of the invention.

Claims

1. A circuit breaker, characterized in that: The circuit breaker comprises an accessory protection module (2), the accessory protection module (2) having an independent protection module housing, installed in the circuit breaker and connected to the circuit breaker accessory of the circuit breaker, the accessory protection module (2) comprising a power supply circuit (22), a single-chip computer circuit (23), an accessory monitoring circuit (24) and a programmable logic interface circuit (29), the power supply circuit (22) supplies power to the single-chip computer circuit (23), the accessory monitoring circuit (24) and the programmable logic interface circuit (29), the accessory monitoring circuit (24) is used to connect to the circuit breaker accessory and collect the working voltage of the circuit breaker accessory, the single-chip computer circuit (23) determines whether the circuit breaker accessory is faulty according to the working voltage, and the programmable logic interface circuit (29) The circuit breaker comprises a DI input detection circuit and a DO output circuit, wherein the output end of the DI input detection circuit and the input end of the DO output circuit are respectively connected to a single-chip computer circuit (23), the single-chip computer circuit (23) can identify the input signal of the DI input detection circuit, and the single-chip computer circuit (23) can control the output signal of the DO output circuit; the circuit breaker accessory is a first accessory or a second accessory, the accessory monitoring circuit (24) comprises a first monitoring circuit for monitoring the working voltage at both ends of the first accessory and a second monitoring circuit for monitoring the working voltage at both ends of the second accessory, the second accessory is a shunt release (13), a closing electromagnet (14) or an energy storage motor (15), and the first accessory is an undervoltage release (12).

2. The circuit breaker according to claim 1, characterized in that: The accessory protection module (2) further comprises a drawer seat position detection circuit (28), the drawer seat position detection circuit (28) comprising three micro switches respectively arranged at a separation position, a test position and a connection position, and three trigger detection circuits respectively connected to the three micro switches, and the three trigger detection circuits are respectively connected to the single chip computer circuit (23).

3. The circuit breaker according to claim 1, characterized in that: The accessory protection module (2) further comprises a switch state detection circuit (27) connected to the single-chip computer circuit (23); the switch state detection circuit (27) is used to connect to the switch state micro switch of the circuit breaker body (1); the switch state micro switch cooperates with the main contact of the circuit breaker body (1) to indicate the position of the main contact and transmit it to the single-chip computer circuit (23).

4. The circuit breaker according to claim 1, characterized in that: The accessory protection module (2) further comprises an accessory control circuit (26) connected to the single-chip computer circuit (23); the accessory control circuit (26) comprises a relay connected to the power input terminal of the circuit breaker accessory; when the circuit breaker accessory fails, the single-chip computer circuit (23) controls the circuit breaker accessory to cut off power through the relay of the accessory control circuit (26).

5. The circuit breaker according to claim 1, characterized in that: The accessory protection module (2) further comprises an accessory monitoring circuit (25) connected to the single-chip computer circuit (23); the accessory monitoring circuit (25) comprises a monitoring resistor connected in series with the circuit breaker accessory, and a voltage amplifying circuit connected to both ends of the monitoring resistor; the voltage amplifying circuit is capable of amplifying the voltage drop across the monitoring resistor and then transmitting the amplified voltage to the single-chip computer circuit (23); the single-chip computer circuit (23) calculates the operating current of the circuit breaker accessory, and determines whether the circuit breaker accessory is operating normally.

6. The circuit breaker according to claim 1, characterized in that: The DI input detection circuit comprises an optical coupler U30, which comprises a matched light emitting diode and an output transistor. The positive electrode of the light emitting diode of the optical coupler U30 is connected to the J7 input terminal of the DI input detection circuit via resistors R32, R33, R34, R35, R36 and R37 in sequence, and the negative electrode of the light emitting diode of the optical coupler U30 is connected to the J8 input terminal of the DI input detection circuit. One end of the output transistor of the optical coupler U30 is connected to the power supply circuit (22), and the other end of the output transistor of the optical coupler U30 is respectively connected to the IO port of the single-chip circuit (23) and the resistor R25, and the other end of the resistor R25 is grounded.

7. The circuit breaker according to claim 1, characterized in that: The DO output circuit comprises a relay K4, a transistor Q30 and an optical coupler U90, the two ends of the normally open contact of the relay K4 are respectively connected to the two output ends of the DO output circuit, the coil of the transistor Q30 and the relay K4 are connected in series with a power supply, the optical coupler U90 is connected between the single-chip computer circuit (23) and the base of the transistor Q30, and the optical coupler U90 can turn on the transistor Q30 through the base of the transistor Q30, so that the coil of the relay K4 is energized.

8. The circuit breaker according to claim 7, characterized in that: The optical coupler U90 comprises a matching light emitting diode and an output transistor. One end of the light emitting diode of the optical coupler U90 is connected to the power supply circuit (22) via a resistor R800, the other end of the light emitting diode of the optical coupler U90 is connected to the I / O of the single chip circuit (23), the E pole of the output transistor of the optical coupler U90 is grounded, the collector of the output transistor of the optical coupler U90 is connected to the base of the transistor Q30, one end of the coil of the relay K4 is respectively connected to the power supply, the positive pole of the diode D30 and the resistor R30, the other end of the coil of the relay K4 is respectively connected to the collector of the transistor Q30 and the negative pole of the diode D30, the other end of the resistor R30 is connected to the base of the transistor Q30, and the emitter of the transistor Q30 is grounded.

9. The circuit breaker according to claim 2, characterized in that: The trigger detection circuit comprises an optical coupler U11, which comprises a light emitting diode and an output transistor that match each other. The positive electrode and the negative electrode of the light emitting diode of the optical coupler U11 are respectively two input ends of the optical coupler U11, and the two ends of the output transistor are respectively two output ends of the optical coupler U11. The positive electrode of the light emitting diode of the optical coupler U11 is sequentially connected to the neutral line of the micro switch through a resistor R77, a voltage stabilizing diode DZ6, a resistor R78, a resistor R79, a resistor R80 and a diode D11, and the negative electrode of the light emitting diode of the optical coupler U11 is connected to the neutral line of the micro switch through a resistor R83. One end of the output transistor of the optical coupler U11 is connected to the power supply circuit (22) through a resistor R81, and the other end of the output transistor of the optical coupler U11 is respectively connected to the input end of the single-chip circuit (23) and a resistor R84, and the other end of the resistor R84 is grounded.

10. The circuit breaker according to claim 1, characterized in that: The invention comprises a plurality of circuit breaker accessories, wherein the plurality of circuit breaker accessories are respectively first accessories or second accessories, wherein the accessory protection module (2) comprises a plurality of accessory control circuits (26) and a plurality of accessory monitoring circuits (25), wherein the plurality of accessory control circuits (26) are used to respectively control a plurality of second accessories, and the plurality of accessory monitoring circuits (25) are used to respectively monitor a plurality of second accessories, wherein the plurality of second accessories are respectively a shunt release (13), a closing electromagnet (14) and an energy storage motor (15), and the plurality of accessory control circuits (26) have the same working principle; the accessory protection module (2) further comprises a drawer seat position detection circuit (28), wherein the drawer seat position detection circuit (28) comprises a micro switch and a trigger detection circuit connected to the micro switch, and the second monitoring circuit has the same working principle as the trigger detection circuit.

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