Intelligent air switch control circuit with wide AC voltage input

By introducing a step-down and steady current and switching power supply circuit into the intelligent air-opening circuit, combining sampling differential and overvoltage protection, the adaptation problem of the intelligent air-opening circuit to a wide voltage range is solved, and the safety protection and service life of the equipment are achieved is achieved. .

CN222191909UActive Publication Date: 2024-12-17SUZHOU GAOPENG PHOTOELECTRIC TECH CO LTD
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Patent Information

Application Number
CN202323631227.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2023-12-29
Publication Date
2024-12-17
Estimated Expiration
2033-12-29

AI Technical Summary

Technical Problem

The existing intelligent air-opening circuit cannot adapt to the wide voltage range, resulting in easy burnout when using the equipment under different voltage environments, especially when the N phase is loose or when the equipment is initially powered, there is a lack of overvoltage protection.

Method used

An intelligent air-open control circuit including a step-down current stabilization circuit, a switching power supply circuit, a MCU circuit, an RS485 transceiver circuit and a motor control circuit was designed. The AC80V-AC500V voltage is reduced to less than or equal to 310V through a step-down current stabilization circuit, and the AC80V-AC500V voltage is reduced to less than or equal to 310V, and Equipped with sampling differential circuit and overvoltage protection to achieve adaptation and protection of wide voltages.

Benefits of technology

It greatly improves the voltage matching range of the circuit, prevents the equipment from burning due to excessive voltage, extends the service life, and reduces the failure rate through precise control.

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Abstract

The utility model provides an intelligent air switch control circuit with wide AC voltage input, which comprises a voltage reduction and current stabilization circuit, a switching power supply circuit, an MCU circuit, an RS485 transceiver circuit, a motor control circuit and a communication interface, and is characterized in that a mains supply is connected with the input end of the voltage reduction and current stabilization circuit, and the output end of the voltage reduction and current stabilization circuit is connected with the input end of the switching power supply circuit; the switching power supply circuit is connected with the sampling differential circuit, the MCU circuit, the motor control circuit and the RS485 transceiver circuit, one output end of the MCU circuit is connected with the input end of the motor control circuit, the MCU circuit is in bidirectional connection with the RS485 transceiver circuit, the input end of the RS485 transceiver circuit is connected with the communication interface, the voltage reduction and current stabilization circuit is arranged to reduce AC 80V-AC 500V power to below AC 310V, the structure is simple, and the cost is low. The circuit voltage matching range is greatly improved, the air switch voltage requirement is met, the phenomenon that the circuit is burnt by double live wires is prevented, and the service life is long.
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Description

Technical Field

[0001] The utility model relates to the technical field of electricity, and more specifically, to an intelligent circuit breaker control circuit with wide AC voltage input. Background Art

[0002] Smart air switches, also known as smart air switches or smart air circuit breakers, will automatically disconnect as long as the current in the circuit exceeds the rated current. They have the functions of cutting off and connecting the power supply, and usually have the functions of automatic tripping for overcurrent and overvoltage. Smart air switches are widely used in low-voltage power distribution networks, electric traction systems, overhead line power transmission, wireless signal base stations and overhead line power supply circuits.

[0003] The circuit used in the existing intelligent circuit breaker has the following defects:

[0004] On the one hand, it is impossible to achieve a wide voltage range (AC80V-AC500) input. If the N phase is loose in some places, the equipment using AC220V voltage cannot withstand the high voltage (AC380V) caused by the loose N phase, which will burn the equipment.

[0005] On the other hand, if two live wires are connected by mistake when the equipment is initially powered, the AC220V electrical equipment will be burned if there is no overvoltage protection measure.

[0006] On the other hand, if the electrical equipment is on the transformer side, the voltage is often too high, sometimes exceeding AC280V, which will also burn the AC220V electrical equipment.

[0007] In view of this, the utility model provides an intelligent circuit breaker control circuit with wide AC voltage input, which has a simple structure, can accept a wide voltage, has a large matching range, improves service life, and effectively protects the electrical equipment used behind the intelligent circuit breaker. Utility Model Content

[0008] The purpose of the utility model is to provide an intelligent circuit breaker control circuit with wide AC voltage input, which has a simple structure, can accept a wide voltage, has a large matching range, improves service life, and effectively protects electrical equipment used behind the intelligent circuit breaker.

[0009] The invention discloses an intelligent circuit breaker control circuit with wide AC voltage input, comprising a step-down and current stabilizing circuit, a switching power supply circuit, an MCU circuit, an RS485 transceiver circuit, a motor control circuit, and a communication interface, wherein the mains power supply is connected to the input end of the step-down and current stabilizing circuit, the output end of the step-down and current stabilizing circuit is connected to the input end of the switching power supply circuit, the switching power supply circuit is connected to the sampling differential circuit, the MCU circuit, the motor control circuit, and the RS485 transceiver circuit, an output end of the MCU circuit is connected to the input end of the motor control circuit, the MCU circuit is bidirectionally connected to the RS485 transceiver circuit, the input end of the RS485 transceiver circuit is connected to the communication interface, the power interface is used to provide AC80V-AC500V electricity, the step-down and current stabilizing circuit is used to reduce the AC power output from the power interface to less than or equal to 310V, the switching power supply circuit is used to supply power to the sampling differential circuit, the MCU circuit, the motor control circuit, and the RS485 transceiver circuit, and the motor control circuit is used to control the motor to automatically close or trip.

[0010] Further, the step-down and current-stabilizing circuit includes a live wire interface JA, a resistor VR1, a resistor VR2, a resistor VR3, a rectifier diode UD1, a neutral wire interface HB, a resistor VR4, a resistor VR5, a resistor VR6, a rectifier diode UD3, a resistor VR8, a voltage regulator diode TV1, a voltage regulator diode TV2, and a mains power supply, which are respectively connected to the live wire interface JA and the neutral wire interface HB, and the output end of the live wire interface JA and the output end of the neutral wire interface HB are connected to the D pole of the NMOS tube and the rectifier diode UD5, and the G pole of the NMOS tube is grounded, and the resistor VR1, the resistor VR2, the resistor VR3, the rectifier diode UD1, the resistor VR8, the voltage regulator diode TV1, the voltage regulator diode TV2, and the mains power supply are respectively connected to the live wire interface JA and the neutral wire interface HB, and the output end of the live wire interface JA and the neutral wire interface HB are connected to the D pole of the NMOS tube and the rectifier diode UD5, and the G pole of the NMOS tube is grounded, and the resistor VR1, the resistor VR2, the resistor VR3, the rectifier diode UD1, the resistor VR8, the voltage regulator diode TV1, the voltage regulator diode TV2, and the mains power supply are connected to the live wire interface JA and the neutral wire interface HB, and the output end of the live wire interface JA and the neutral wire interface HB are connected to the D pole of the NMOS tube in sequence. VR1, resistor VR2, and resistor VR3 play a current limiting role, and the rectifier diode UD1 plays a rectifying role. Resistors VR4, VR5, VR6, and rectifier diode UD3 are connected in sequence between the output end of the neutral line interface HB and the D pole of the NMOS tube. Resistors VR4, VR5, and VR6 play a current limiting role, and the rectifier diode UD3 plays a rectifying role. Resistors VR8, Zener diode TV1, and Zener diode TV2 are arranged in sequence between the G pole of the NMOS tube and the ground. Resistor VR8 plays a current limiting role, and Zener diodes TV1 and TV2 play a voltage stabilizing role. The voltages of the Zener diodes TV1 and TV2 are both 150V.

[0011] Furthermore, a resistor VR9 and a capacitor VC1 are connected in sequence between the output end of the live interface JA, the output end of the neutral interface HB and the rectifier diode UD5. The resistor VR9 plays a role of current limiting, and the capacitor VC1 plays a role of energy storage.

[0012] Furthermore, a varistor RV1 is connected between the live wire interface JA and the neutral wire interface HB to provide lightning protection and overvoltage protection.

[0013] Furthermore, the power interface is also connected to a sampling differential circuit, which is used to collect the current signal at the power interface and differentially process and output it to the MCU circuit. The sampling differential circuit is connected to the MCU circuit. The sampling differential circuit is set to accurately and efficiently control the opening and closing of the power switch, reduce the failure rate, and further improve the life of the circuit structure.

[0014] Furthermore, the UA1 pin of the live wire interface JA is connected to one input end of the sampling differential circuit, the UB1 pin of the neutral wire interface HB is connected to the other input end of the sampling differential circuit, the output end of the sampling differential circuit is connected to the MCU circuit, the sampling differential circuit includes resistors RA1, RA, R1, RN1, RN, R2, and an operational amplifier U3A. The UA1 of the live wire interface JA is connected to the inverting end of the operational amplifier U3A through resistors RA1, RA, and R1, the UB1 pin of the neutral wire interface HB is connected to the inverting end of the operational amplifier U3A through resistors RN1, RN, and R2, and the output end of the operational amplifier U3A is connected to pin 1 of the MCU chip U4.

[0015] Furthermore, the motor control circuit includes a closing circuit and a tripping circuit. Pin 2 of the MCU chip U4 is connected to the closing circuit. When the sampled differential circuit collects data less than 260V, the MCU circuit controls the tripping circuit to automatically close the motor. Pin 3 of the MCU chip U4D is connected to the tripping circuit. When the sampled differential circuit collects data greater than 280V, the MCU circuit controls the tripping circuit to trip the motor.

[0016] Furthermore, the MCU circuit is also connected to an indicator light circuit, and the indicator light circuit is used to reflect the circuit status.

[0017] Furthermore, the switching power supply circuit is a flyback switching power supply circuit.

[0018] Beneficial effects of the utility model: the utility model proposes an intelligent circuit breaker control circuit with wide AC voltage input, including a step-down and current stabilizing circuit, a switching power supply circuit, an MCU circuit, an RS485 transceiver circuit, a motor control circuit, and a communication interface. The AC power supply is connected to the input end of the step-down and current stabilizing circuit, the output end of the step-down and current stabilizing circuit is connected to the input end of the switching power supply circuit, the switching power supply circuit is connected to the sampling differential circuit, the MCU circuit, the motor control circuit, and the RS485 transceiver circuit, an output end of the MCU circuit is connected to the input end of the motor control circuit, the MCU circuit is bidirectionally connected to the RS485 transceiver circuit, and the input end of the RS485 transceiver circuit is connected to the communication interface. By setting the step-down and current stabilizing circuit, the AC80V-AC500V voltage is reduced to below AC310V. The structure is simple, the circuit voltage matching range is greatly improved, the circuit breaker voltage requirement is met, the circuit burning phenomenon of double live wires is prevented, and the service life is long. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Combined with the following Figure 1 When read together, the above and other features of the present invention will be more fully described. It is understood that these drawings only depict several embodiments of the present invention and should not be considered as limiting the scope of the present invention. By using the drawings, the present invention will be more clearly and detailed.

[0020] Figure 1 The present invention is a schematic diagram of the system structure of an intelligent circuit breaker control circuit with wide AC voltage input.

[0021] Figure 2 The utility model discloses a circuit diagram of a voltage-reducing and current-stabilizing circuit and a switching power supply circuit of an intelligent circuit breaker control circuit with a wide AC voltage input.

[0022] Figure 3 The present invention is a circuit diagram of a sampling differential circuit of an intelligent circuit breaker control circuit with wide AC voltage input.

[0023] Figure 4 The utility model is a circuit diagram of a motor control circuit of an intelligent circuit breaker control circuit with wide AC voltage input.

[0024] Figure 5 The utility model discloses a circuit diagram of an MCU circuit of an intelligent circuit breaker control circuit with wide AC voltage input.

[0025] Figure 6 The utility model discloses a circuit diagram of an RS485 transceiver circuit of an intelligent circuit breaker control circuit with wide AC voltage input.

[0026] Figure 7 The utility model discloses a circuit diagram of an indicator light circuit of an intelligent circuit breaker control circuit with a wide AC voltage input. DETAILED DESCRIPTION

[0027] The following embodiments are described to assist the understanding of the present invention, and the embodiments are not and should not be interpreted in any way as limiting the protection scope of the present invention.

[0028] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as separate functional units (which may include subunits), but those skilled in the art will recognize that various components or portions thereof may be divided into separate components, or may be integrated together (including integration into a single system or component). The connections between components or systems are not intended to be limited to direct connections. Instead, the data between these components may be modified, reformatted, or otherwise changed by intermediate components. In addition, additional or fewer connections may be used. It should also be noted that the terms "connect", "connect", or "input" "fixed" should be understood to include direct connection, indirect connection or fixation through one or more intermediate media.

[0029] Embodiment 1:

[0030] like Figure 1 As shown, it is a schematic diagram of the system structure of the intelligent circuit breaker control circuit with wide AC voltage input of the utility model; Figure 2 As shown in FIG. 1 , it is a circuit diagram of a voltage-stepping and current-stabilizing circuit and a switching power supply circuit of an intelligent circuit breaker control circuit with a wide AC voltage input of the utility model; Figure 3 As shown in FIG. 1 , it is a circuit diagram of a sampling differential circuit of an intelligent circuit breaker control circuit with wide AC voltage input of the utility model; Figure 4 As shown in FIG. 1 , it is a circuit diagram of a motor control circuit of an intelligent circuit breaker control circuit with wide AC voltage input of the utility model; Figure 5 As shown, it is a circuit diagram of the MCU circuit of the intelligent circuit breaker control circuit with wide AC voltage input of the utility model; Figure 6 As shown in FIG. 1 , it is a circuit diagram of the RS485 transceiver circuit of the intelligent circuit breaker control circuit with wide AC voltage input of the utility model; Figure 7 As shown, it is a circuit diagram of the indicator light circuit of the intelligent circuit breaker control circuit with wide AC voltage input of the utility model.

[0031] The invention discloses an intelligent circuit breaker control circuit with wide AC voltage input, comprising a step-down and current stabilizing circuit, a switching power supply circuit, an MCU circuit, an RS485 transceiver circuit, a motor control circuit, and a communication interface, wherein the mains power supply is connected to the input end of the step-down and current stabilizing circuit, the output end of the step-down and current stabilizing circuit is connected to the input end of the switching power supply circuit, the switching power supply circuit is connected to the sampling differential circuit, the MCU circuit, the motor control circuit, and the RS485 transceiver circuit, an output end of the MCU circuit is connected to the input end of the motor control circuit, the MCU circuit is bidirectionally connected to the RS485 transceiver circuit, the input end of the RS485 transceiver circuit is connected to the communication interface, the power interface is used to provide AC80V-AC500V electricity, the step-down and current stabilizing circuit is used to reduce the AC power output from the power interface to less than or equal to 310V, the switching power supply circuit is used to supply power to the sampling differential circuit, the MCU circuit, the motor control circuit, and the RS485 transceiver circuit, and the motor control circuit is used to control the motor to automatically close or trip.

[0032] The step-down and current-stabilizing circuit comprises a live wire interface JA, a resistor VR1, a resistor VR2, a resistor VR3, a rectifier diode UD1, a neutral wire interface HB, a resistor VR4, a resistor VR5, a resistor VR6, a rectifier diode UD3, a resistor VR8, a voltage-stabilizing diode TV1, a voltage-stabilizing diode TV2, and a mains power supply, which are respectively connected to the live wire interface JA and the neutral wire interface HB; the output end of the live wire interface JA and the output end of the neutral wire interface HB are connected to the D pole of the NMOS tube and the rectifier diode UD5; the G pole of the NMOS tube is grounded; the resistor VR1, the resistor VR2, the resistor VR3, the rectifier diode UD1, the resistor VR4, the resistor VR5, the voltage-stabilizing diode TV1, the voltage-stabilizing diode TV2, and the mains power supply are respectively connected to the live wire interface JA and the neutral wire interface HB; the output end of the live wire interface JA and the output end of the neutral wire interface HB are connected to the D pole of the NMOS tube and the rectifier diode UD5; the G pole of the NMOS tube is grounded; the resistor VR1, the resistor VR2, the resistor VR3, the rectifier diode UD1, the resistor VR4, the voltage-stabilizing diode TV1, the voltage-stabilizing diode TV2, and the mains power supply are respectively connected to the live wire interface JA and the neutral wire interface HB; 1. Resistors VR2 and VR3 play a current limiting role, and rectifier diode UD1 plays a rectifying role. Resistors VR4, VR5, VR6, and rectifier diode UD3 are connected in sequence between the output end of the neutral line interface HB and the D pole of the NMOS tube. Resistors VR4, VR5, and VR6 play a current limiting role, and rectifier diode UD3 plays a rectifying role. Resistors VR8, Zener diode TV1, and Zener diode TV2 are arranged in sequence between the G pole of the NMOS tube and the ground. Resistor VR8 plays a current limiting role, and Zener diodes TV1 and TV2 play a voltage stabilizing role. The voltages of the Zener diodes TV1 and TV2 are both 150V.

[0033] A resistor VR9 and a capacitor VC1 are connected in sequence between the output end of the live interface JA, the output end of the neutral interface HB and the rectifier diode UD5. The resistor VR9 plays a role of current limiting, and the capacitor VC1 plays a role of energy storage.

[0034] A varistor RV1 is also connected between the live wire interface JA and the neutral wire interface HB to provide lightning protection and overvoltage protection.

[0035] The power interface is also connected to a sampling differential circuit, which is used to collect the current signal at the power interface and differentially process and output it to the MCU circuit. The sampling differential circuit is connected to the MCU circuit. The sampling differential circuit is set to accurately and efficiently control the opening and closing of the power switch, reduce the failure rate, and further improve the life of the circuit structure.

[0036] The UA1 pin of the live wire interface JA is connected to one input end of the sampling differential circuit, the UB1 pin of the neutral wire interface HB is connected to the other input end of the sampling differential circuit, the output end of the sampling differential circuit is connected to the MCU circuit, the sampling differential circuit includes resistor RA1, resistor RA, resistor R1, resistor RN1, resistor RN, resistor R2, and operational amplifier U3A, the UA1 of the live wire interface JA is connected to the inverting end of the operational amplifier U3A through resistor RA1, resistor RA, resistor R1, the UB1 pin of the neutral wire interface HB is connected to the in-phase end of the operational amplifier U3A through resistor RN1, resistor RN, resistor R2, and the output end of the operational amplifier U3A is connected to pin 1 of the MCU chip U4.

[0037] The motor control circuit includes a closing circuit and a tripping circuit. Pin 2 of the MCU chip U4 is connected to the closing circuit. When the data collected by the sampling differential circuit is less than 260V, the MCU circuit controls the tripping circuit to automatically close the motor. Pin U4D3 of the MCU chip is connected to the tripping circuit. When the data collected by the sampling differential circuit is greater than 280V, the MCU circuit controls the tripping circuit to trip the motor.

[0038] The MCU circuit is also connected to an indicator light circuit, which is used to reflect the circuit status.

[0039] The switching power supply circuit is a flyback switching power supply circuit.

[0040] Beneficial effects of the utility model: the utility model proposes an intelligent circuit breaker control circuit with wide AC voltage input, including a step-down and current stabilizing circuit, a switching power supply circuit, an MCU circuit, an RS485 transceiver circuit, a motor control circuit, and a communication interface. The AC power supply is connected to the input end of the step-down and current stabilizing circuit, the output end of the step-down and current stabilizing circuit is connected to the input end of the switching power supply circuit, the switching power supply circuit is connected to the sampling differential circuit, the MCU circuit, the motor control circuit, and the RS485 transceiver circuit, an output end of the MCU circuit is connected to the input end of the motor control circuit, the MCU circuit is bidirectionally connected to the RS485 transceiver circuit, and the input end of the RS485 transceiver circuit is connected to the communication interface. By setting the step-down and current stabilizing circuit, the AC80V-AC500V voltage is reduced to below AC310V. The structure is simple, the circuit voltage matching range is greatly improved, the circuit breaker voltage requirement is met, the circuit burning phenomenon of double live wires is prevented, and the service life is long.

[0041] Although the utility model has disclosed multiple aspects and embodiments, other aspects and embodiments will be obvious to those skilled in the art, and several modifications and improvements may be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. The multiple aspects and embodiments disclosed in the utility model are only for illustration and are not intended to limit the utility model. The actual protection scope of the utility model shall be subject to the claims.

Claims

1. An intelligent circuit breaker control circuit with wide AC voltage input, comprising a voltage-step-down and current-stabilizing circuit, a switching power supply circuit, an MCU circuit, an RS485 transceiver circuit, a motor control circuit, and a communication interface, characterized in that: The mains power supply is connected to the input end of the step-down and current-stabilizing circuit, the output end of the step-down and current-stabilizing circuit is connected to the input end of the switching power supply circuit, the switching power supply circuit is connected to the sampling differential circuit, the MCU circuit, the motor control circuit, and the RS485 transceiver circuit, an output end of the MCU circuit is connected to the input end of the motor control circuit, the MCU circuit is bidirectionally connected to the RS485 transceiver circuit, the input end of the RS485 transceiver circuit is connected to the communication interface, the power interface is used to provide AC80V-AC500V electricity, the step-down and current-stabilizing circuit is used to reduce the AC power output of the power interface to less than or equal to 310V, the switching power supply circuit is used to supply power to the sampling differential circuit, the MCU circuit, the motor control circuit, and the RS485 transceiver circuit, and the motor control circuit is used to control the motor to automatically close or trip.

2. The intelligent circuit breaker control circuit with wide AC voltage input according to claim 1, characterized in that: The step-down and current-stabilizing circuit comprises a live wire interface JA, a resistor VR1, a resistor VR2, a resistor VR3, a rectifier diode UD1, a neutral wire interface HB, a resistor VR4, a resistor VR5, a resistor VR6, a rectifier diode UD3, a resistor VR8, a voltage-stabilizing diode TV1, a voltage-stabilizing diode TV2, and a mains power supply, which are respectively connected to the live wire interface JA and the neutral wire interface HB; the output end of the live wire interface JA and the output end of the neutral wire interface HB are connected to the D pole of the NMOS tube and the rectifier diode UD5; the G pole of the NMOS tube is grounded; the resistor VR1, the resistor VR2, the resistor VR3, the rectifier diode UD1, the resistor VR4, the resistor VR5, the voltage-stabilizing diode TV1, the voltage-stabilizing diode TV2, and the mains power supply are respectively connected to the live wire interface JA and the neutral wire interface HB; the output end of the live wire interface JA and the output end of the neutral wire interface HB are connected to the D pole of the NMOS tube and the rectifier diode UD5; the G pole of the NMOS tube is grounded; the resistor VR1, the resistor VR2, the resistor VR3, the rectifier diode UD1, the resistor VR4, the voltage-stabilizing diode TV1, the voltage-stabilizing diode TV2, and the mains power supply are respectively connected to the live wire interface JA and the neutral wire interface HB; 1. Resistors VR2 and VR3 play a current limiting role, and rectifier diode UD1 plays a rectifying role. Resistors VR4, VR5, VR6, and rectifier diode UD3 are connected in sequence between the output end of the neutral line interface HB and the D pole of the NMOS tube. Resistors VR4, VR5, and VR6 play a current limiting role, and rectifier diode UD3 plays a rectifying role. Resistors VR8, Zener diode TV1, and Zener diode TV2 are arranged in sequence between the G pole of the NMOS tube and the ground. Resistor VR8 plays a current limiting role, and Zener diodes TV1 and TV2 play a voltage stabilizing role. The voltages of the Zener diodes TV1 and TV2 are both 150V.

3. The intelligent circuit breaker control circuit with wide AC voltage input as claimed in claim 2, characterized in that: A resistor VR9 and a capacitor VC1 are connected in sequence between the output end of the live interface JA, the output end of the neutral interface HB and the rectifier diode UD5. The resistor VR9 plays a role of current limiting, and the capacitor VC1 plays a role of energy storage.

4. The intelligent circuit breaker control circuit with wide AC voltage input as claimed in claim 2, characterized in that: A varistor RV1 is also connected between the live wire interface JA and the neutral wire interface HB to provide lightning protection and overvoltage protection.

5. The intelligent circuit breaker control circuit with wide AC voltage input according to claim 1, characterized in that: The power interface is also connected to a sampling differential circuit, which is used to collect current signals at the power interface and output them to the MCU circuit through differential processing. The sampling differential circuit is connected to the MCU circuit.

6. The intelligent circuit breaker control circuit with wide AC voltage input as claimed in claim 5, characterized in that: The UA1 pin of the live wire interface JA is connected to one input end of the sampling differential circuit, the UB1 pin of the neutral wire interface HB is connected to the other input end of the sampling differential circuit, the output end of the sampling differential circuit is connected to the MCU circuit, the sampling differential circuit includes resistor RA1, resistor RA, resistor R1, resistor RN1, resistor RN, resistor R2, and operational amplifier U3A, the UA1 of the live wire interface JA is connected to the inverting end of the operational amplifier U3A through resistor RA1, resistor RA, resistor R1, the UB1 pin of the neutral wire interface HB is connected to the in-phase end of the operational amplifier U3A through resistor RN1, resistor RN, resistor R2, and the output end of the operational amplifier U3A is connected to pin 1 of the MCU chip U4.

7. The intelligent circuit breaker control circuit with wide AC voltage input according to claim 1, characterized in that: The motor control circuit includes a closing circuit and a tripping circuit. Pin 2 of the MCU chip U4 is connected to the closing circuit. When the data collected by the sampling differential circuit is less than 260V, the MCU circuit controls the tripping circuit to automatically close the motor. Pin 3 of the MCU chip U4D is connected to the tripping circuit. When the data collected by the sampling differential circuit is greater than 280V, the MCU circuit controls the tripping circuit to trip the motor.

8. The intelligent circuit breaker control circuit with wide AC voltage input according to claim 1, characterized in that: The MCU circuit is also connected to an indicator light circuit, which is used to reflect the circuit status.

9. The intelligent circuit breaker control circuit with wide AC voltage input according to claim 1, characterized in that: The switching power supply circuit is a flyback switching power supply circuit.