Control system of quick circuit breaker and quick circuit breaker

Abstract

The utility model provides a control system of a fast circuit breaker and the fast circuit breaker, which comprises a current detection circuit, a voltage detection circuit, an execution circuit, a contact, an input terminal, an output terminal and a bus. A current signal is converted into a voltage difference signal and amplified, then the amplified voltage difference signal is compared with a set data value, the set data value is set through the resistance value of an internal resistor, a turn-off signal is output to an execution circuit after the current exceeds the set data value, and a voltage detection circuit carries out voltage reduction collection on the voltage of a bus and then outputs the turn-off signal to the execution circuit. The voltage is compared with a set voltage value, a turn-off signal is output to the execution circuit after the voltage exceeds the set voltage value, the execution circuit disconnects the contact according to the turn-off signal, and load protection is achieved.

Description

Technical Field

[0001] The utility model belongs to the field of fast circuit breakers, and in particular relates to a control system of a fast circuit breaker and a fast circuit breaker. Background Art

[0002] The main function of a fast circuit breaker is to cut off the circuit in time while ensuring the normal operation of the circuit or equipment to avoid damage or accidents caused by abnormal conditions such as equipment overload or short circuit. It detects the current or voltage in the circuit. When an abnormality occurs in the circuit, it immediately triggers the circuit breaker to isolate the circuit from the power supply, thereby protecting the circuit or equipment.

[0003] A DC fast circuit breaker provided by publication number CN211670160U includes: a frame; a conductive system, the conductive system is used to connect to an external circuit; a contact operating system, the contact operating system is arranged in the conductive system, the lower end of the contact operating system passes through the conductive system, and the contact operating system is used to perform opening and closing operations on the conductive system; a tripping operating system, the tripping operating system is arranged at the lower end of the contact operating system, and the tripping operating system is used to control the opening and closing operations of the contact operating system; an electromagnetic closing system, the electromagnetic closing system drives the contact operating system to perform closing operations through the tripping operating system. This traditional electromagnetic circuit breaker is tripped by the current of the tripping magnet. Since it directly relies on electromagnetic force for tripping, it is impossible to perform accurate current judgment, and it can only be used for rated current. It is impossible to increase the range of use by changing the value of the protection current. At the same time, when the voltage abnormality becomes large, it is impossible to perform protection before closing. Utility Model Content

[0004] The utility model aims to provide a control system of a fast circuit breaker and a fast circuit breaker to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A control system for a fast circuit breaker, comprising:

[0007] A current detection circuit, the current detection circuit includes a current sensing rectifier circuit, a current collection circuit, an amplifier circuit, and a current analysis circuit, which is used to step down, rectify, collect, amplify, and compare the current data in the bus with the set data value, and send a shutdown signal to the execution circuit. The current sensing rectifier circuit includes an inductor Z1 and a rectifier bridge, the inductor Z1 is electrically connected to the two input ends of the rectifier bridge, and the two output ends of the rectifier bridge are electrically connected to the current collection circuit, which is used to reduce the current in the bus and rectify it into direct current through the rectifier bridge, and send it to the current collection circuit. The current collection circuit has two input ends and two output ends, and the two input ends are connected to the current sensing rectifier. The two output ends of the current collecting circuit are electrically connected, and the two output ends are connected to the amplifier circuit, which is used to collect data of the current rectified by the current sensing rectifier circuit, and convert the current data into a voltage difference signal and send it to the amplifier circuit. The two input ends of the amplifier circuit are electrically connected to the two output ends of the current collecting circuit, and the other end is electrically connected to the current analysis circuit, which is used to receive the voltage difference signal of the current collecting circuit and amplify it, and send the amplified voltage difference signal to the current analysis circuit. The input end of the current analysis circuit is electrically connected to the output end of the amplifier circuit, and the output end is electrically connected to the execution circuit, which is used to compare the amplified voltage difference signal with the set data value, and send a shutdown signal to the execution circuit;

[0008] A voltage detection circuit, wherein the voltage detection circuit includes a voltage collection circuit and a voltage analysis circuit, and is used to collect the voltage data in the bus at a reduced voltage, and compare the voltage data after the reduced voltage with the set voltage data, and send a shutdown signal to the execution circuit. The input end of the voltage collection circuit is electrically connected to the bus, and the output end is electrically connected to the input end of the voltage analysis circuit, and is used to collect the voltage data in the bus at a reduced voltage, and send it to the voltage analysis circuit. The output end of the voltage analysis circuit is electrically connected to the execution circuit, and is used to compare the voltage data after the reduced voltage with the set data value, and send a shutdown signal to the execution circuit;

[0009] The execution circuit has two input terminals and two output terminals. The two input terminals are electrically connected to the current detection circuit and the voltage detection circuit respectively. The two output terminals are connected in series to the busbar, and are used to disconnect the busbar after receiving the shutdown signal sent by the current detection circuit and the voltage detection circuit.

[0010] In one embodiment, the rectifier bridge is composed of four diodes D1, D2, D3, and D4, the anode of the diode D1 is electrically connected to the cathode of the diode D2 and one end of the inductor Z1, the cathode is electrically connected to the cathode of the diode D3 and an input end of the current acquisition circuit, the anode of the diode D3 is electrically connected to the cathode of the diode D4 and the other input end of the inductor Z1, and the anode of the diode D4 is electrically connected to the anode of the diode D2 and the other input end of the current acquisition circuit.

[0011] In one embodiment, the current acquisition circuit includes a resistor R1, a resistor R2, a resistor R3 and a capacitor C1, the resistor R1 is connected in parallel with the capacitor C1, one end of the parallel connection is electrically connected to one end of the resistor R2, the other end of the resistor R2 is electrically connected to an input end of the amplifier circuit, the other end of the parallel connection is electrically connected to one end of the resistor R3, and the other end of the resistor R3 is electrically connected to another input end of the amplifier circuit.

[0012] In one embodiment, the amplifier circuit includes a resistor R4, a resistor R5 and an operational amplifier T1, one end of the resistor R4 is electrically connected to one end of the resistor R2 and the inverting input end of the operational amplifier T1, and the other end is electrically connected to the output end of the operational amplifier T1 and the input end of the current analysis circuit, the non-inverting input end of the operational amplifier T1 is electrically connected to one end of the resistor R3 and one end of the resistor R5, and the other end of the resistor R5 is connected to GND.

[0013] In one embodiment, the current analysis circuit includes a comparator T2, a resistor R6, and a resistor R7. The non-inverting input terminal of the comparator T2 is electrically connected to the output terminal of the operational amplifier T1 and one end of the resistor R4, the inverting input terminal is electrically connected to one end of the resistor R6 and one end of the resistor R7, the positive power supply terminal is connected to VCC, the negative power supply terminal is connected to GND, the output terminal is electrically connected to the execution circuit, the other end of the resistor R6 is connected to VCC, and the other end of the resistor R7 is connected to GND.

[0014] In one embodiment, the voltage acquisition circuit includes a transformer Z2, a resistor R8, and a diode D5. The transformer Z2 has two input ends and two output ends, one input end is electrically connected to the bus, the other input end is connected to GND, one output end is electrically connected to one end of the resistor R8 and the anode of the diode D5, the other output end is electrically connected to the other end of the resistor R8, and the cathode of the diode D5 is electrically connected to the voltage analysis circuit.

[0015] In one embodiment, the voltage analysis circuit includes a comparator T3, a resistor R9, and a resistor R10. The non-inverting input terminal of the comparator T3 is electrically connected to one end of the diode D5, the inverting input terminal is electrically connected to one end of the resistor R9 and one end of the resistor R10, the positive power supply terminal is connected to VCC, the negative power supply terminal is connected to GND, the output terminal is electrically connected to the execution circuit, the other end of the resistor R9 is connected to VCC, and the other end of the resistor R10 is connected to GND.

[0016] In one embodiment, the execution circuit includes an electromagnetic coil L1, a MOS tube Q1, a resistor R11, and an OR gate logic chip OR1. One end of the electromagnetic coil L1 is connected to GND, and the other end is electrically connected to the source of the MOS tube Q1. The drain of the MOS tube Q1 is electrically connected to one end of the resistor R11, and the gate is electrically connected to the output end of the OR gate logic chip OR1. The other end of the resistor R12 is connected to the bus, and the two input ends of the OR gate logic chip OR1 are electrically connected to the output end of the comparator T2 and the output end of the comparator T3, respectively.

[0017] In one embodiment, the resistor R7 is an adjustable resistor.

[0018] A fast circuit breaker, comprising an input terminal, an output terminal, a busbar, contacts and the above-mentioned control system of a fast circuit breaker, one end of the input terminal is electrically connected to one end of the busbar, and the other end is electrically connected to a power grid power supply for connecting the power supply, the other end of the busbar is electrically connected to the output terminal, and is used to detect current and voltage for the fast circuit breaker, the contacts are connected in series in the busbar for realizing circuit switching, one end of the output terminal is electrically connected to the other end of the busbar, and the other end is electrically connected to a load device.

[0019] The beneficial effects of the utility model are:

[0020] The utility model converts the current signal into a differential pressure signal and amplifies it after rectification according to the current data of the bus through the current detection circuit, and then compares the amplified differential pressure signal with the set data value. The set data value is set by the resistance value of the internal resistor. After the current exceeds the set data value, a shutdown signal is output to the execution circuit. After the voltage of the bus is collected by the voltage detection circuit after voltage reduction, it is compared with the set voltage value. After the voltage exceeds the set voltage data value, a shutdown signal is output to the execution circuit. The execution circuit disconnects the contact according to the shutdown signal to protect the load. The current in the bus can be accurately judged by the current analysis circuit, and the use range of the fast circuit breaker can be increased by adjusting the size of the set data value of the current analysis circuit. At the same time, the voltage in the bus is detected by the voltage detection circuit. When the voltage becomes abnormally large, the fast circuit breaker cannot be closed, thereby realizing the protection of the load before closing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the circuit structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the current detection circuit of the utility model;

[0023] Figure 3 This is a schematic diagram of the voltage detection circuit structure of the utility model.

[0024] In the figure: 100 current detection circuit, 110 current sensing and rectifying circuit, 120 current acquisition circuit, 130 amplification circuit, 140 current analysis circuit, 200 voltage detection circuit, 210 voltage acquisition circuit, 220 voltage analysis circuit, 300 execution circuit. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Example:

[0027] See also Figure 1-3 , the utility model provides a technical solution:

[0028] A control system for a fast circuit breaker includes a current detection circuit 100, a voltage detection circuit 200, and an execution circuit 300, wherein:

[0029] The current detection circuit 100 includes a current sensing rectifier circuit 110, a current acquisition circuit 120, an amplifier circuit 130, and a current analysis circuit 140, which are used to step down, rectify, acquire, amplify, and compare the current data in the bus with the set data value, and send a shutdown signal to the execution circuit 300. The current sensing rectifier circuit 110 includes an inductor Z1 and a rectifier bridge. The inductor Z1 adopts a current sensor of model LTSR25-NP, which is electrically connected to the two input ends of the rectifier bridge. The two output ends of the rectifier bridge are electrically connected to the current acquisition circuit 120, which is used to reduce the current in the bus and rectify it into direct current through the rectifier bridge, and send it to the current acquisition circuit 120. The current acquisition circuit 120 has two input ends and two output ends. The two input ends are connected to the current sensor. The two output ends of the current sensing rectifier circuit 110 are electrically connected, and the two output ends are connected to the amplifier circuit 130, which is used to collect data on the current rectified by the current sensing rectifier circuit 110, and convert the current data into a voltage difference signal and send it to the amplifier circuit 130. The two input ends of the amplifier circuit 130 are electrically connected to the two output ends of the current acquisition circuit 120, and the other end is electrically connected to the current analysis circuit 140, which is used to receive the voltage difference signal of the current acquisition circuit 120 and amplify it, and send the amplified voltage difference signal to the current analysis circuit 140. The input end of the current analysis circuit 140 is electrically connected to the output end of the amplifier circuit 130, and the output end is electrically connected to the execution circuit 300, which is used to compare the amplified voltage difference signal with the set data value and send a shutdown signal to the execution circuit 300.

[0030] Furthermore, the rectifier bridge is composed of four diodes D1, D2, D3, and D4, and the diodes are all P6KE12A diodes. The anode of the diode D1 is electrically connected to the cathode of the diode D2 and one end of the inductor Z1, and the cathode is electrically connected to the cathode of the diode D3 and an input end of the current acquisition circuit 120. The anode of the diode D3 is electrically connected to the cathode of the diode D4 and the other input end of the inductor Z1, and the anode of the diode D4 is electrically connected to the anode of the diode D2 and the other input end of the current acquisition circuit 120. The current change in the busbar will cause the inductor to generate an electromotive force, which is rectified into a DC signal by the rectifier bridge and sent to the current acquisition circuit 120 through the two output ends of the rectifier bridge.

[0031] Furthermore, the current acquisition circuit 120 includes a resistor R1, a resistor R2, a resistor R3 and a capacitor C1. The resistor R1 is a metal film resistor of model RS-05002FT. The resistor R1 is connected in parallel with an aluminum electrolyte capacitor C1 of model CD11. One end of the parallel connection is electrically connected to one end of the resistor R2. The other end of the resistor R2 is electrically connected to an input end of the amplifier circuit 130. The other end of the parallel connection is electrically connected to one end of the resistor R3. The other end of the resistor R3 is electrically connected to another input end of the amplifier circuit 130. The resistor model used by the resistor R2 and the resistor R3 is RS-05K102JT2. Both ends of the resistor R1 are connected to two output ends of the rectifier bridge. The current signal of the rectifier bridge will form a voltage difference at both ends of the resistor R1. The capacitor C1 is used to filter out interference in the current signal, and then the voltage difference signal at both ends of the resistor R1 is sent to the amplifier circuit 130 through the resistor R2 and the resistor R3.

[0032] Furthermore, the amplifier circuit 130 includes a resistor R4, a resistor R5 and an operational amplifier T1. The resistor models used by the resistors R4 and R5 are both RS-05K102JT2. The model used by the operational amplifier T1 is LM 358. One end of the resistor R4 is electrically connected to one end of the resistor R2 and the inverting input end of the operational amplifier T1, and the other end is electrically connected to the output end of the operational amplifier T1 and the input end of the current analysis circuit 140. The non-inverting input end of the operational amplifier T1 is electrically connected to one end of the resistor R3 and one end of the resistor R5. The other end of the resistor R5 is connected to GND.

[0033] Furthermore, the current analysis circuit 140 includes a comparator T2, a resistor R6, and a resistor R7. The comparator T2 adopts a model LM339. The non-inverting input terminal of the comparator T2 is electrically connected to the output terminal of the operational amplifier T1 and one end of the resistor R4, the inverting input terminal is electrically connected to one end of the resistor R6 and one end of the resistor R7, the positive power supply terminal is connected to VCC, the negative power supply terminal is connected to GND, and the output terminal is electrically connected to the execution circuit 300. The resistor R6 adopts a resistor model RS-05K102JT2, and the other end of the resistor R6 is connected to VCC. The resistor R7 adopts a fine-tuning resistor model 3296W-1-1021K, and the other end of the resistor R7 is connected to GND.

[0034] Furthermore, the resistor R7 is an adjustable resistor.

[0035] After the non-inverting input terminal of the comparator T2 receives the amplified voltage difference signal of the operational amplifier T1, it is compared with the set data value of the inverting input terminal. The set data value of the inverting input terminal is obtained by dividing the voltage VCC through two voltage-dividing resistors R6 and R7. Since the resistor R7 is an adjustable resistor, the set data value of the inverting input terminal can be adjusted by adjusting the resistance value of the resistor R7. When the amplified voltage difference signal is greater than the set data value, a shutdown signal is output to the execution circuit 300.

[0036] The voltage detection circuit 200 includes a voltage collection circuit 210 and a voltage analysis circuit 220, which are used to collect the voltage data in the bus at a reduced voltage, compare the voltage data after the reduced voltage with the set voltage data, and send a shutdown signal to the execution circuit 300. The input end of the voltage collection circuit 210 is electrically connected to the bus, and the output end is electrically connected to the input end of the voltage analysis circuit 220, which is used to collect the voltage data in the bus at a reduced voltage and send it to the voltage analysis circuit 220. The output end of the voltage analysis circuit 220 is electrically connected to the execution circuit 300, which is used to compare the voltage data after the reduced voltage with the set data value, and send a shutdown signal to the execution circuit 300.

[0037] Furthermore, the voltage acquisition circuit 210 includes a transformer Z2, a resistor R8, and a diode D5. The transformer Z2 adopts an AC transformer with a model of LYPT-58-120420V, has two input ends and two output ends, one input end is electrically connected to the bus, the other input end is connected to GND, one output end is electrically connected to one end of a resistor R8 with a model of RS-05K102JT2 and an anode of a diode D5, and the other output end is electrically connected to the other end of the resistor R8. The diode adopts a model of D5P6KE12A, and the cathode of the diode D5 is electrically connected to the voltage analysis circuit 220.

[0038] Furthermore, the voltage analysis circuit 220 includes a comparator T3, a resistor R9, and a resistor R10. The comparator T3 adopts a model LM339. The non-inverting input terminal of the comparator T3 is electrically connected to one end of the diode D5, the inverting input terminal is electrically connected to one end of the resistor R9 and one end of the resistor R10, the positive power supply terminal is connected to VCC, the negative power supply terminal is connected to GND, and the output terminal is electrically connected to the execution circuit 300. The resistor R9 adopts a resistor model RS-05K102JT2, and the other end of the resistor R9 is connected to VCC. The resistor R10 adopts a fine-tuning resistor model 3296W-1-1021K, and the other end of the resistor R10 is connected to GND.

[0039] After the voltage in the bus is stepped down by transformer Z2 and passes through diode D5, the negative voltage is removed and the positive voltage is retained, thereby eliminating the influence on the voltage analysis process. After the non-inverting input terminal of comparator T3 receives the stepped-down voltage data, it is compared with the set data value of the inverting input terminal. The set data value of the inverting input terminal is obtained by dividing the voltage VCC through two voltage-dividing resistors R10 and R11. When the stepped-down voltage data is greater than the set data value, a shutdown signal is output to the execution circuit 300.

[0040] The execution circuit 300 has two input terminals and two output terminals. The two input terminals are electrically connected to the current detection circuit 100 and the voltage detection circuit 200 respectively, and the two output terminals are connected in series to the bus for disconnecting the bus after receiving the shutdown signal from the current detection circuit 100 and the voltage detection circuit 200.

[0041] Furthermore, the execution circuit 300 includes an electromagnetic coil L1, a MOS tube Q1, a resistor R11, and an OR gate logic chip OR1. One end of the electromagnetic coil L1 is connected to GND, and the other end is electrically connected to the source of the MOS tube Q1. The model of the MOS tube is FQPF8N60C. The drain of the MOS tube Q1 is electrically connected to one end of the resistor R11 with a model RS-05K102JT2, and the gate is electrically connected to the output end of the OR gate logic chip OR1. The other end of the resistor R11 is connected to the bus. The model of the OR gate logic chip OR1 is 71HC86. The two input ends of the OR gate logic chip OR1 are electrically connected to the output end of the comparator T2 and the output end of the comparator T3, respectively.

[0042] After receiving the shutdown signal from the output end of comparator T2 and the output end of comparator T3, the OR gate logic chip OR1 outputs the shutdown signal to the gate of the MOS tube Q1. After the gate is energized, the MOS tube is turned on, causing the electromagnetic coil L1 to turn on and off to generate magnetic force, causing the contact to trip.

[0043] A fast circuit breaker, comprising an input terminal, an output terminal, a busbar, contacts and a control system of a fast circuit breaker as described in any one of the above, wherein one end of the input terminal is electrically connected to one end of the busbar, and the other end is electrically connected to a power grid power supply for connecting the power supply, the other end of the busbar is electrically connected to the output terminal for detecting current and voltage for the fast circuit breaker, the contacts are connected in series in the busbar for realizing circuit switching, and one end of the output terminal is electrically connected to the other end of the busbar, and the other end is electrically connected to a load device.

[0044] The use principle of the utility model: the utility model converts the current signal into a pressure difference signal and amplifies it after rectification according to the current data of the bus through the current detection circuit, and then compares the amplified pressure difference signal with the set data value. The set data value is set by the resistance value of the internal resistor. When the current exceeds the set data value, the shutdown signal is output to the execution circuit. The voltage detection circuit collects the voltage of the bus after voltage reduction and compares it with the set voltage value. When the voltage exceeds the set voltage data value, the shutdown signal is output to the execution circuit. The execution circuit disconnects the contacts according to the shutdown signal to protect the load.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A control system for a fast circuit breaker, characterized in that: include: A current detection circuit (100), the current detection circuit (100) comprising a current sensing rectifier circuit (110), a current collection circuit (120), an amplifier circuit (130), and a current analysis circuit (140), for reducing voltage, rectifying, collecting, amplifying, and comparing current data in a bus with a set data value, and sending a shutdown signal to an execution circuit (300), the current sensing rectifier circuit (110) comprising an inductor coil Z1 and a rectifier bridge, the inductor coil Z1 being electrically connected to two input ends of the rectifier bridge, the two output ends of the rectifier bridge being electrically connected to the current collection circuit (120), for reducing the current in the bus, and rectifying it into direct current through the rectifier bridge, and sending it to the current collection circuit (120), the current collection circuit (120) having two input ends and two output ends, the two input ends being electrically connected to the current sensing rectifier circuit (1 The two output ends of the current sensing rectifier circuit (110) are electrically connected, and the two output ends are connected to an amplifier circuit (130) for collecting data of the current rectified by the current sensing rectifier circuit (110), and converting the current data into a voltage difference signal and sending it to the amplifier circuit (130); the two input ends of the amplifier circuit (130) are electrically connected to the two output ends of the current collection circuit (120), and the other end is electrically connected to a current analysis circuit (140) for receiving and amplifying the voltage difference signal of the current collection circuit (120), and sending the amplified voltage difference signal to the current analysis circuit (140); the input end of the current analysis circuit (140) is electrically connected to the output end of the amplifier circuit (130), and the output end is electrically connected to an execution circuit (300) for comparing the amplified voltage difference signal with a set data value, and sending a shutdown signal to the execution circuit (300); A voltage detection circuit (200), the voltage detection circuit (200) comprising a voltage collection circuit (210) and a voltage analysis circuit (220), for collecting voltage data in a busbar at a reduced voltage, comparing the reduced voltage data with set voltage data, and sending a shutdown signal to an execution circuit (300), the input end of the voltage collection circuit (210) being electrically connected to the busbar, the output end being electrically connected to the input end of the voltage analysis circuit (220), for collecting voltage data in the busbar at a reduced voltage, and sending the data to the voltage analysis circuit (220), the output end of the voltage analysis circuit (220) being electrically connected to the execution circuit (300), for comparing the reduced voltage data with set data values, and sending a shutdown signal to the execution circuit (300); An execution circuit (300) has two input ends and two output ends, the two input ends are electrically connected to a current detection circuit (100) and a voltage detection circuit (200) respectively, and the two output ends are connected in series to a bus bar, and are used to disconnect the bus bar after receiving a shutdown signal sent by the current detection circuit (100) and the voltage detection circuit (200).

2. A control system for a fast circuit breaker according to claim 1, characterized in that: The rectifier bridge is composed of four diodes D1, D2, D3, and D4; the anode of the diode D1 is electrically connected to the cathode of the diode D2 and one end of the inductor Z1; the cathode of the diode D1 is electrically connected to the cathode of the diode D3 and an input end of the current collection circuit (120); the anode of the diode D3 is electrically connected to the cathode of the diode D4 and the other input end of the inductor Z1; and the anode of the diode D4 is electrically connected to the anode of the diode D2 and the other input end of the current collection circuit (120).

3. The control system of a fast circuit breaker according to claim 1, characterized in that: The current acquisition circuit (120) comprises a resistor R1, a resistor R2, a resistor R3 and a capacitor C1, wherein the resistor R1 is connected in parallel with the capacitor C1, one end of the parallel connection is electrically connected to one end of the resistor R2, the other end of the resistor R2 is electrically connected to an input end of the amplifier circuit (130), the other end of the parallel connection is electrically connected to one end of the resistor R3, and the other end of the resistor R3 is electrically connected to another input end of the amplifier circuit (130).

4. The control system of a fast circuit breaker according to claim 1, characterized in that: The amplifier circuit (130) comprises a resistor R4, a resistor R5 and an operational amplifier T1, one end of the resistor R4 is electrically connected to one end of the resistor R2 and the inverting input end of the operational amplifier T1, and the other end is electrically connected to the output end of the operational amplifier T1 and the input end of the current analysis circuit (140), the non-inverting input end of the operational amplifier T1 is electrically connected to one end of the resistor R3 and one end of the resistor R5, and the other end of the resistor R5 is connected to GND.

5. The control system of a fast circuit breaker according to claim 1, characterized in that: The current analysis circuit (140) comprises a comparator T2, a resistor R6, and a resistor R7. The non-inverting input terminal of the comparator T2 is electrically connected to the output terminal of the operational amplifier T1 and one end of the resistor R4, the inverting input terminal is electrically connected to one end of the resistor R6 and one end of the resistor R7, the positive power supply terminal is connected to VCC, the negative power supply terminal is connected to GND, the output terminal is electrically connected to the execution circuit (300), the other end of the resistor R6 is connected to VCC, and the other end of the resistor R7 is connected to GND.

6. The control system of a fast circuit breaker according to claim 1, characterized in that: The voltage acquisition circuit (210) comprises a transformer Z2, a resistor R8, and a diode D5. The transformer Z2 has two input ends and two output ends, one input end is electrically connected to the bus, the other input end is connected to GND, one output end is electrically connected to one end of the resistor R8 and the anode of the diode D5, the other output end is electrically connected to the other end of the resistor R8, and the cathode of the diode D5 is electrically connected to the voltage analysis circuit (220).

7. The control system of a fast circuit breaker according to claim 1, characterized in that: The voltage analysis circuit (220) comprises a comparator T3, a resistor R9, and a resistor R10. The non-inverting input terminal of the comparator T3 is electrically connected to one end of the diode D5, the inverting input terminal is electrically connected to one end of the resistor R9 and one end of the resistor R10, the positive power supply terminal is connected to VCC, the negative power supply terminal is connected to GND, the output terminal is electrically connected to the execution circuit (300), the other end of the resistor R9 is connected to VCC, and the other end of the resistor R10 is connected to GND.

8. The control system of a fast circuit breaker according to claim 1, characterized in that: The execution circuit (300) comprises an electromagnetic coil L1, a MOS tube Q1, a resistor R11, and an OR gate logic chip OR1; one end of the electromagnetic coil L1 is connected to GND, and the other end is electrically connected to the source of the MOS tube Q1; the drain of the MOS tube Q1 is electrically connected to one end of the resistor R11, and the gate is electrically connected to the output end of the OR gate logic chip OR1; the other end of the resistor R11 is connected to a bus; and two input ends of the OR gate logic chip OR1 are electrically connected to the output end of the comparator T2 and the output end of the comparator T3, respectively.

9. The control system of a fast circuit breaker according to claim 5, characterized in that: The resistor R7 is an adjustable resistor.

10. A fast circuit breaker, characterized in that: The fast circuit breaker includes an input terminal, an output terminal, a busbar, contacts and a control system of a fast circuit breaker according to any one of claims 1 to 9, one end of the input terminal is electrically connected to one end of the busbar, and the other end is electrically connected to the power grid power supply for connecting the power supply, the other end of the busbar is electrically connected to the output terminal, and is used to detect current and voltage for the fast circuit breaker, the contacts are connected in series in the busbar for realizing circuit switching, one end of the output terminal is electrically connected to the other end of the busbar, and the other end is electrically connected to the load device.

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