CN205489452U - Circuit breaker circuit - Google Patents

Abstract

A circuit breaker circuit includes a power supply circuit, a tripping circuit, a leakage test circuit and a leakage signal acquisition control circuit. The input end of the power supply circuit is connected with the L pole of the power supply and the N pole of the power supply respectively, the output end of the power supply circuit is connected with the leakage signal acquisition control circuit and the tripping circuit, and the output end of the leakage signal acquisition control circuit is connected with the tripping circuit; the leakage signal acquisition The control circuit includes a zero-sequence transformer TA and a control chip IC1. When the control chip IC1 detects residual current, it controls the tripping circuit to perform the tripping action of the circuit breaker; it also includes an overvoltage detection circuit, and the overvoltage detection circuit includes a control chip. IC2, DC voltage signal input terminal and control signal output terminal; the DC voltage signal input terminal of the overvoltage detection circuit is connected to a DC output node of the output terminal of the power supply circuit, and the DC voltage signal received by the DC voltage signal input terminal of the overvoltage detection circuit After the judgment and comparison of the control chip IC2, the output level is controlled by the control chip IC1.

Description

circuit breaker circuit

technical field

The utility model relates to the field of low-voltage electrical appliances, in particular to a circuit breaker circuit, in particular to a circuit breaker circuit with both residual current protection and overvoltage protection.

Background technique

At present, when the customer uses the residual current operated circuit breaker, the input power of the circuit breaker often has 380V voltage applied to the circuit due to wrong wiring or the power supply is overvoltage caused by the instability of the power grid, which burns down the load equipment at the lower end of the circuit breaker. At present, the circuit breakers on the market only have residual current action protection, without overvoltage function, or only have overvoltage function without residual current action protection, and the accuracy of the overvoltage action value of the product is not high enough, which greatly affects the reliability of the product for customers. Basic needs for sex and security.

Contents of the invention

The purpose of the utility model is to overcome the defects of the prior art, and provide a circuit breaker circuit with stable performance, high precision, and protection for residual current and overvoltage at the same time.

In order to achieve the above object, the utility model adopts the following technical solutions:

A circuit breaker circuit, comprising a power supply circuit, a tripping circuit, a leakage test circuit and a leakage signal acquisition control circuit, the input terminals of the power supply circuit are respectively connected to the L poles of the power supply and the N poles of the power supply, and the output terminals of the power supply circuit are connected to the leakage signal The acquisition control circuit is connected with the tripping circuit to provide working power for it, the output terminal of the leakage signal acquisition control circuit is connected with the tripping circuit, and the tripping signal is output to the tripping circuit; the leakage signal acquisition control circuit includes a zero-sequence transformer TA and Control chip IC1, the control chip IC1 directly monitors the residual current of the main circuit through the zero-sequence transformer TA, when the control chip IC1 detects the residual current, it controls the tripping circuit to perform the tripping action of the circuit breaker; it also includes an overvoltage detection circuit , the overvoltage detection circuit includes a control chip IC2, a DC voltage signal input terminal and a control signal output terminal; the DC voltage signal input terminal of the overvoltage detection circuit is connected to a DC output node of the output terminal of the power supply circuit, and the DC voltage signal of the overvoltage detection circuit The DC voltage signal received at the input terminal is judged and compared by the control chip IC2, and the output level is controlled by the control chip IC1. When the control chip IC1 is abnormal in the overvoltage, the tripping circuit is controlled to perform the tripping action of the circuit breaker.

Further, the overvoltage detection circuit also includes a diode D2, a resistor R5 and a resistor R6, a capacitor C9 and a capacitor C10, the resistor R5 and the resistor R6 are used for voltage division, and the capacitor C9 is used for filtering; one end of the resistor R5 is connected to the output end of the power supply circuit One DC output node is connected, the other end is connected to the parallel connection of capacitor C9 and resistor R6, the other end of the parallel connection of capacitor C9 and resistor R6 is grounded, the other end of resistor R5 is connected to the second pin of the control chip IC2, and the capacitor C10 They are respectively connected to the fourth pin and the fifth pin of the control chip IC2, the third pin of the control chip IC2 is connected to the fourth pin and grounded, the first pin of the control chip IC2 is connected to the anode of the diode D2, and the diode D2 The negative pole of D2 is connected to the fourth pin of the control chip IC1.

Further, the power supply circuit includes a rectification circuit and a step-down circuit, the input ends of the rectification circuit are respectively connected to the L pole and the N pole of the power supply, the output end of the rectification circuit is connected to the input end of the step-down circuit, and the output end of the step-down circuit It is connected with the control chip IC1 of the leakage signal acquisition control circuit; the DC voltage signal input terminal of the overvoltage detection circuit is connected with a DC output node of the output terminal of the rectification circuit.

Further, the rectifier circuit is a full-wave rectifier circuit, including a rectifier bridge composed of diode VD1, diode VD2, diode VD3 and diode VD4, and the two opposite polarity ends of the rectifier bridge are respectively connected to the power supply L pole and the power supply N pole, rectifying The negative terminal of the two homopolar terminals of the bridge is the positive pole of the DC output terminal, and the positive terminal of the two homopolar terminals of the rectifier bridge is the common ground pole.

Further, the step-down circuit includes a resistor R4 and a capacitor C8, one end of the resistor R4 is connected to a DC output node at the output end of the rectifier circuit, the other end of the resistor R4 is connected to the eighth pin of the control chip IC1, and one end of the capacitor C8 is connected to the eighth pin of the control chip IC1. The other end of the resistor R4 is connected, and the other end is grounded.

Further, the power supply circuit further includes a surge absorbing circuit, and the surge absorbing circuit includes a varistor RV, and the two ends of the varistor RV are respectively connected to the L pole and the N pole of the power supply.

Further, the tripping circuit includes a tripping coil KA and a thyristor VT, the tripping coil KA and the thyristor VT are connected in series, the anode of the thyristor VT is connected to the L pole of the power supply, and the cathode of the thyristor VT is grounded. , the G pole of the thyristor VT is connected to the seventh pin of the control chip IC1.

Further, the trip coil KA is connected in series between the power circuit and the L pole of the power supply, or the trip coil KA is connected in series between the power circuit and the N pole of the power supply, or the trip coil KA is connected in series between the power circuit and the controllable between silicon VT.

Further, the leakage signal acquisition control circuit also includes a bidirectional diode D1, a debugging resistor R1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6 and a capacitor C7; the debugging resistor R1, The bidirectional diode D1 and the capacitor C1 are connected in parallel at both ends of the secondary circuit lead of the zero-sequence transformer TA; one end of the resistor R2 is connected to one end of the capacitor C1, and the other end of the resistor R2 is connected to one end of the capacitor C2 and one end of the capacitor C3 It is connected in parallel with the first pin of the control chip IC1; one end of the resistor R3 is connected to the other end of the capacitor C1, the other end of the resistor R3 is connected to the other end of the capacitor C2, and one end of the capacitor C4 is connected to the second pin of the control chip IC1 Parallel connection; the other end of the capacitor C3 is connected to the other end of the capacitor C4 and the third pin of the control chip IC1; the fourth pin and the fifth pin of the control chip IC1 are connected to the positive pole of the diode D2 and one end of the capacitor C5 Connect in parallel, the other end of the capacitor C5 is grounded; the sixth pin of the control chip IC1 is connected to one end of the capacitor C6, the seventh pin of the control chip IC1 is connected to the other end of the capacitor C6, one end of the capacitor C7, and the release circuit. The G poles of the silicon-controlled VT1 are connected in parallel, the other end of the capacitor C7 is grounded, and the eighth pin of the control chip IC1 is connected to another DC output node of the power supply circuit.

Further, the leakage test loop includes a normally open test switch S1 and a resistor R7, the normally open test switch S1 and the resistor R7 are connected in series to form a test loop, and the loop passes through the zero-sequence transformer TA and is connected in parallel to the main circuit.

The circuit breaker circuit of the utility model adopts a power supply circuit, an overvoltage detection circuit, a leakage signal acquisition control circuit, a tripping circuit, a leakage test circuit, and a power supply circuit, so that the circuit breaker increases the protection function of the original remaining circuit on the basis of Overvoltage protection function; the overvoltage detection circuit adds a separate control chip to judge and compare the DC voltage signal, improve the accuracy of the overvoltage action value, and increase the reliability and safety of the product. The power supply circuit also includes a surge absorbing circuit, so that the circuit breaker circuit also has a surge protection function. In addition, the trip coil KA is connected in series between the power circuit and the L pole of the power supply, or the trip coil KA is connected in series between the power circuit and the N pole of the power supply, or the trip coil KA is connected in series between the power circuit and the thyristor VT between.

Description of drawings

Fig. 1 is the structural block diagram of circuit breaker circuit of the present utility model;

Fig. 2 is the circuit diagram of the first embodiment of the utility model circuit breaker circuit;

Fig. 3 is the circuit diagram of the second embodiment of the circuit breaker circuit of the present invention;

Fig. 4 is a circuit diagram of the third embodiment of the circuit breaker circuit of the present invention.

detailed description

The specific implementation of the circuit breaker circuit of the present utility model will be further described below in conjunction with the embodiments given in accompanying drawings 1 to 4 . The circuit breaker circuit of the present invention is not limited to the description of the following embodiments.

As shown in Figure 1, the circuit breaker circuit of the utility model includes a power supply circuit, a tripping circuit, a leakage test circuit, a leakage signal acquisition control circuit and an overvoltage detection circuit. The power supply circuit includes a surge absorbing circuit, a rectifying circuit and a step-down circuit. The input end of described power supply circuit is connected with power supply L pole and power supply N pole respectively, and power supply circuit takes alternating current from power supply L pole and power supply N pole; Provide working power; the output terminal of the electrical signal acquisition control circuit is connected to the tripping circuit, and the leakage signal acquisition control circuit is used to detect whether there is residual current in the main circuit, and control the tripping circuit to perform the tripping action when the residual current occurs; The circuit is used to drive the tripping coil KA (executive device) to generate a tripping action, which is controlled by the leakage signal acquisition control circuit; the leakage test circuit is used to generate a simulated residual current to detect whether the tripping action of the residual current operated circuit breaker is valid ; One end of the overvoltage detection circuit is connected to the power supply circuit, and the other end is connected to the leakage signal acquisition control circuit for detecting whether there is an overvoltage in the circuit.

As shown in Figure 2-4, the leakage signal acquisition control circuit of the utility model includes a zero-sequence transformer TA and a control chip IC1. The control chip IC1 directly monitors the residual current of the main circuit through the zero-sequence transformer TA. When the control chip IC1 is detecting When the residual current is reached, the tripping circuit is controlled to perform the tripping action of the circuit breaker; the overvoltage detection circuit includes the control chip IC2, the DC voltage signal input terminal and the control signal output terminal; the DC voltage signal input terminal of the overvoltage detection circuit and the power circuit The output terminal is connected to a DC output node, and the DC voltage signal received by the DC voltage signal input terminal of the overvoltage detection circuit is judged and compared by the control chip IC2, and the output level is controlled by the control chip IC1. In case of abnormality, the tripping circuit is controlled to perform the tripping action of the circuit breaker. The circuit breaker circuit of the utility model adopts a power supply circuit, an overvoltage detection circuit, a leakage signal acquisition control circuit, a tripping circuit, a leakage test circuit, and a power supply circuit, so that the circuit breaker increases the protection function of the original remaining circuit on the basis of Overvoltage protection function; the overvoltage detection circuit adds a separate control chip to judge and compare the DC voltage signal, improve the accuracy of the overvoltage action value, and increase the reliability and safety of the product.

As shown in Figure 2-4, the overvoltage detection circuit also includes a diode D2, a resistor R5 and a resistor R6, a capacitor C9 and a capacitor C10, a resistor R5 and a resistor R6 for voltage division, and a capacitor C9 for filtering; the resistor R5 One end is connected to a DC output node at the output end of the power supply circuit, the other end is connected to the parallel connection of capacitor C9 and resistor R6, the other end of the parallel connection of capacitor C9 and resistor R6 is grounded, and the other end of resistor R5 is connected to the second terminal of the control chip IC2 The pins are connected, the capacitor C10 is respectively connected to the fourth pin and the fifth pin of the control chip IC2, the third pin of the control chip IC2 is connected to the fourth pin and grounded, and the first pin of the control chip IC2 is connected to the diode The anode of D2 is connected, and the cathode of diode D2 is connected to the fourth pin of the control chip IC1. When the first pin of the control chip IC2 outputs a high level, after the processing of the control chip IC1, the seventh pin of the control chip IC1 outputs a high level to the thyristor G pole, so that the thyristor VT is turned on to achieve the tripping effect .

As shown in Figure 2-4, the power circuit includes a surge absorbing circuit, a rectifying circuit and a step-down circuit. The power supply circuit includes a rectification circuit and a step-down circuit, the input ends of the rectification circuit are respectively connected to the L pole and the N pole of the power supply, the output end of the rectification circuit is connected to the input end of the step-down circuit, and the output end of the step-down circuit is connected to the leakage current The control chip IC1 of the signal acquisition control circuit is connected; the DC voltage signal input terminal of the overvoltage detection circuit is connected with a DC output node of the output terminal of the rectification circuit.

Specifically, the rectifier circuit is a full-wave rectifier circuit, including a rectifier bridge composed of diode VD1, diode VD2, diode VD3 and diode VD4, and the two opposite polarity terminals of the rectifier bridge are respectively connected to the L pole and the N pole of the power supply, The negative polarity terminal of the two homopolar terminals of the rectifier bridge is the positive pole of the DC output terminal, and the positive polarity terminal of the two homopolar terminals of the rectifier bridge is a common ground pole. The rectifier circuit can also adopt a half-wave rectifier circuit. The step-down circuit includes a resistor R4 and a capacitor C8. One end of the resistor R4 is connected to a DC output node at the output end of the rectifier circuit, the other end of the resistor R4 is connected to the eighth pin of the control chip IC1, and one end of the capacitor C8 is connected to the other end of the resistor R4. One end is connected and the other end is grounded. The step-down circuit only uses the resistor R4 to step down the voltage. The circuit is simple and facilitates the miniaturization of the circuit. The capacitor C8 provides the reduced voltage to the eighth pin of the control chip IC1 after filtering.

Specifically, the power supply circuit also includes a surge absorbing circuit, the surge absorbing circuit includes a varistor RV, and the two ends of the varistor RV are respectively connected to the L pole and the N pole of the power supply for surge absorption, and the The circuit is protected against surges.

As shown in Figure 2-4, the tripping circuit includes a tripping coil KA and a thyristor VT, the tripping coil KA and the thyristor VT are connected in series, the anode of the thyristor VT is connected to the L pole of the power supply, and the controllable The cathode ground electrode of the silicon VT, the G electrode of the thyristor VT are connected to the seventh pin of the control chip IC1. When there is a leakage current, the control chip IC1 collects the signal and outputs a high level to the G electrode of the thyristor VT for conduction. After the thyristor VT is turned on, it forms a loop with the diode in the rectifier bridge and the tripping coil KA, and a large current passes through the tripping coil, so that the driving mechanism trips. The tripping circuit under the control of the G pole of the thyristor VT1 has two states of on and off: in the normal condition of the main circuit, the leakage signal acquisition control circuit controls the thyristor VT1 to turn off (making the on/off control loop in the off state). off state), the current in the tripping coil KA in the tripping circuit connected in series cannot excite the tripping coil to generate a tripping action; when the main circuit has residual current (leakage current), the leakage signal acquisition control circuit controls the thyristor VT1 conduction (trigger the tripping circuit to conduct), the current in the tripping coil KA in the tripping circuit connected in series increases, so that the tripping coil is excited to generate a tripping action.

Specifically, the location of the tripping coil KA can have various embodiments. The tripping coil KA is connected in series between the power circuit and the L pole of the power supply (refer to FIG. 4 ), or the tripping coil KA is connected in series between the power circuit Between the N pole of the power supply (refer to FIG. 2 ), or the tripping coil KA is connected in series between the power supply circuit and the thyristor VT (refer to FIG. 3 ).

As shown in Figure 2-4, the leakage signal acquisition control circuit also includes a bidirectional diode D1, a debugging resistor R1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6 and a capacitor C7; debugging resistor R1, bidirectional diode D1, and capacitor C1 are connected in parallel to both ends of the secondary circuit lead of the zero-sequence transformer TA; one end of the resistor R2 is connected to one end of the capacitor C1, and the other end of the resistor R2 is connected to the capacitor C2. One end, one end of the capacitor C3 and the first pin of the control chip IC1 are connected in parallel; one end of the resistor R3 is connected to the other end of the capacitor C1, the other end of the resistor R3 is connected to the other end of the capacitor C2, and one end of the capacitor C4 is connected to the control chip The second pin of IC1 is connected in parallel; the other end of the capacitor C3 is connected to the other end of the capacitor C4, and the third pin of the control chip IC1 is connected to the ground; the fourth pin and the fifth pin of the control chip IC1 are connected to the diode D2 The positive electrode and one end of the capacitor C5 are connected in parallel, and the other end of the capacitor C5 is grounded; the sixth pin of the control chip IC1 is connected to one end of the capacitor C6, and the seventh pin of the control chip IC1 is connected to the other end of the capacitor C6 and one end of the capacitor C7 1. The G poles of the thyristor VT1 of the tripping circuit are connected in parallel, the other end of the capacitor C7 is grounded, and the eighth pin of the control chip IC1 is connected to another DC output node of the power supply circuit.

As shown in Figure 2-4, the leakage test loop includes a normally open test switch S1 and a resistor R7, the normally open test switch S1 and the resistor R7 are connected in series to form a test loop, the loop passes through the zero-sequence transformer TA and is connected in parallel to the main in the circuit. When the test switch S1 is manually pressed to turn on the test circuit, the current flowing in the test circuit plays the role of simulating the residual current, so that the residual current signal will be induced in the secondary circuit of the zero-sequence transformer TA, and the signal can trigger The tripping coil KA generates a tripping action to detect whether the tripping protection of the circuit breaker is normal.

The control process of the tripping protection function of the present invention will be further described below with reference to the embodiments given in FIGS. 2 to 4 .

Overvoltage trip protection process: the power supply voltage (AC voltage on the AC input side) is rectified by the rectifier circuit and converted into a DC voltage (signal), and the DC voltage is output from a DC output node of the power circuit to the overvoltage detection circuit. The detection circuit applies the DC voltage signal to the control chip IC2 for control after being divided by the resistor R5 and the resistor R6 and filtered by the capacitor C9. The seventh pin outputs a high level to the thyristor G pole, triggering the conduction between the anode and the cathode of the thyristor VT, causing the tripping coil KA to generate a tripping action.

Leakage tripping protection process: When the main circuit has residual current, the secondary circuit of the zero-sequence transformer TA will induce a leakage signal, and the leakage signal will cause the voltage difference between the first pin and the second pin of the control chip IC1 When the voltage rises, the seventh pin of the control chip IC1 outputs a high level to the G pole of the thyristor VT1 to trigger the conduction between the anode and the cathode of the thyristor VT1, causing the tripping coil KA to generate a tripping action.

The above content is a further detailed description of the utility model in combination with specific preferred embodiments, and it cannot be assumed that the specific implementation of the utility model is only limited to these descriptions. For a person of ordinary skill in the technical field to which the utility model belongs, without departing from the concept of the utility model, some simple deduction or substitutions can also be made, which should be regarded as belonging to the protection scope of the utility model.

Claims (10)

1. A circuit breaker circuit, comprising a power supply circuit, a tripping circuit, a leakage test circuit and a leakage signal acquisition control circuit, characterized in that: the input end of the power supply circuit is connected with the power supply L pole and the power supply N pole respectively, and the power supply circuit The output end of the leakage signal acquisition control circuit is connected with the tripping circuit to provide working power for it, and the output end of the leakage signal acquisition control circuit is connected with the tripping circuit, and the tripping signal is output to the tripping circuit; The leakage signal acquisition control circuit includes a zero-sequence transformer TA and a control chip IC1. The control chip IC1 directly monitors the residual current of the main circuit through the zero-sequence transformer TA. When the control chip IC1 detects the residual current, it controls the tripping circuit to perform disconnection. The tripping action of the device; Also includes an overvoltage detection circuit, the overvoltage detection circuit includes a control chip IC2, a DC voltage signal input terminal and a control signal output terminal; the DC voltage signal input terminal of the overvoltage detection circuit is connected to a DC output node at the output terminal of the power supply circuit, and the overvoltage The DC voltage signal received by the DC voltage signal input terminal of the detection circuit is judged and compared by the control chip IC2, and the output level is controlled by the control chip IC1. tripping action. 2. The circuit breaker circuit according to claim 1, characterized in that: the overvoltage detection circuit further comprises a diode D2, a resistor R5 and a resistor R6, a capacitor C9 and a capacitor C10, a resistor R5 and a resistor R6 for voltage division, Capacitor C9 is used for filtering; one end of resistor R5 is connected to a DC output node at the output end of the power supply circuit, the other end is connected to one end of capacitor C9 and resistor R6 in parallel, the other end of capacitor C9 and resistor R6 is connected to ground in parallel, and the other end of resistor R5 The other end is connected to the second pin of the control chip IC2, the capacitor C10 is respectively connected to the fourth pin and the fifth pin of the control chip IC2, the third pin of the control chip IC2 is connected to the fourth pin and grounded, and the control The first pin of the chip IC2 is connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the fourth pin of the control chip IC1. 3. The circuit breaker circuit according to claim 1, characterized in that: the power supply circuit includes a rectification circuit and a step-down circuit, the input terminals of the rectification circuit are respectively connected to the L poles of the power supply and the N poles of the power supply, and the output terminals of the rectification circuit It is connected to the input end of the step-down circuit, and the output end of the step-down circuit is connected to the control chip IC1 of the leakage signal acquisition control circuit; the DC voltage signal input end of the overvoltage detection circuit is connected to a DC output node of the output end of the rectification circuit. 4. The circuit breaker circuit according to claim 3, characterized in that: the rectifier circuit is a full-wave rectifier circuit, comprising a rectifier bridge composed of diode VD1, diode VD2, diode VD3 and diode VD4, two different The polarity terminals are respectively connected to the L pole and the N pole of the power supply. The negative terminal of the two terminals of the same polarity of the rectifier bridge is the positive terminal of the DC output terminal, and the positive terminal of the two terminals of the same polarity of the rectifier bridge is the common the poles of the earth. 5. The circuit breaker circuit according to claim 3, wherein the step-down circuit comprises a resistor R4 and a capacitor C8, one end of the resistor R4 is connected to a DC output node of the output end of the rectifier circuit, and the other end of the resistor R4 is connected to The eighth pin of the control chip IC1 is connected, one end of the capacitor C8 is connected to the other end of the resistor R4, and the other end is grounded. 6. The circuit breaker circuit according to any one of claims 3-5, characterized in that: the power supply circuit also includes a surge absorbing circuit, the surge absorbing circuit includes a varistor RV, and the two ends of the varistor RV are respectively Connect to the L pole and the N pole of the power supply respectively. 7. The circuit breaker circuit according to claim 1, characterized in that: the tripping circuit includes a tripping coil KA and a thyristor VT, the tripping coil KA and the thyristor VT are connected in series, and the thyristor VT The anode is connected to the L pole of the power supply, the cathode of the thyristor VT is grounded, and the G pole of the thyristor VT is connected to the seventh pin of the control chip IC1. 8. The circuit breaker circuit according to claim 7, characterized in that: the trip coil KA is connected in series between the power circuit and the L pole of the power supply, or the trip coil KA is connected in series between the power circuit and the N pole of the power supply Between, or the tripping coil KA is connected in series between the power supply circuit and the thyristor VT. 9. The circuit breaker circuit according to claim 2, characterized in that: the leakage signal acquisition control circuit also includes a bidirectional diode D1, a debugging resistor R1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2, a capacitor C3, and a capacitor C4, capacitor C5, capacitor C6, and capacitor C7; debugging resistor R1, bidirectional diode D1, and capacitor C1 are connected in parallel to both ends of the secondary circuit lead of the zero-sequence transformer TA; one end of the resistor R2 is connected to one end of the capacitor C1, The other end of the resistor R2 is connected in parallel with one end of the capacitor C2, one end of the capacitor C3 and the first pin of the control chip IC1; one end of the resistor R3 is connected with the other end of the capacitor C1, and the other end of the resistor R3 is connected with the other end of the capacitor C2 Connection, one end of the capacitor C4 is connected in parallel with the second pin of the control chip IC1; the other end of the capacitor C3 is connected with the other end of the capacitor C4 and the third pin of the control chip IC1; the fourth pin of the control chip IC1 The fifth pin is connected in parallel with the anode of the diode D2 and one end of the capacitor C5, and the other end of the capacitor C5 is grounded; the sixth pin of the control chip IC1 is connected to one end of the capacitor C6, and the seventh pin of the control chip IC1 is connected to the capacitor The other end of C6, one end of capacitor C7, and the G pole of the thyristor VT1 of the tripping circuit are connected in parallel, the other end of capacitor C7 is grounded, and the eighth pin of the control chip IC1 is connected to another DC output node of the power circuit. 10. The circuit breaker circuit according to claim 1, characterized in that: the leakage test circuit includes a normally open test switch S1 and a resistor R7, the normally open test switch S1 and the resistor R7 are connected in series to form a test loop, and the loop passes through zero The sequence transformer TA is connected in parallel in the main circuit.