CN205389098U - Residual current operated circuit breaker circuit - Google Patents

Abstract

The residual current action circuit breaker circuit of the utility model includes a power supply circuit, a leakage signal acquisition control circuit, a tripping circuit and a test circuit, the input terminals of the power supply circuit are respectively connected with the power supply L phase and the power supply N phase, It is connected with the leakage signal acquisition control circuit and the tripping circuit, and provides working power for it. The output terminal of the leakage signal acquisition control circuit is connected with the tripping circuit, and outputs a tripping signal to the tripping circuit; the leakage signal acquisition control circuit includes zero-sequence mutual inductance The device TA monitors the residual current of the main circuit through the zero-sequence transformer TA. When the residual current is detected, the leakage signal acquisition control circuit controls the tripping circuit to perform the tripping action of the circuit breaker, and the leakage signal acquisition control circuit outputs the tripping action. The control signal is turned off after the delay time is over, so that the circuit board will not be burned when the circuit breaker enters the line and the terminal is reversed.

Description

residual current operated circuit breaker circuit

technical field

The utility model relates to the field of low-voltage electrical appliances, in particular to a circuit breaker operated by residual current.

Background technique

At present, the electronic component board of the electronic leakage circuit breaker is basically connected to the outlet end of the circuit breaker. Under normal wiring (upper incoming line) conditions, when the test button is pressed, the zero-sequence transformer senses the residual current, and the electronic component board drives the trip. The breaker trips the circuit breaker, at which point the electronics board is simultaneously de-energized. Under the condition of wrong wiring (bottom incoming line), when the test button is pressed, the circuit breaker will trip. At this time, the electronic component board is not powered off, and the tripping coil will continue to be driven until the tripping coil, thyristor and other electronic component board components are damaged. So far, resulting in product failure, causing losses to customers.

Contents of the invention

The purpose of the utility model is to overcome the defects of the prior art, and provide an application circuit with safe and stable performance, low cost and output control that can be turned off.

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

A residual current operated circuit breaker circuit, comprising a power supply circuit, a leakage signal acquisition control circuit, a tripping circuit and a test circuit, the input terminals of the power supply circuit are respectively connected to the L phase of the power supply and the N phase of the power supply, and the output terminals of the power supply circuit are connected to the power supply N phase. The leakage signal acquisition control circuit is connected to the tripping circuit to provide working power for it, the output terminal of the leakage signal acquisition control circuit is connected to 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, through the zero-sequence transformer TA to monitor the residual current of the main circuit, when the residual current is detected, the leakage signal acquisition control circuit controls the tripping circuit to perform the tripping action of the circuit breaker, and the leakage signal acquisition control circuit outputs the tripping control The signal is turned off after the delay time is over, so that the circuit board will not be burned when the incoming terminal of the circuit breaker and the terminal are reversed; the circuit breaker includes an incoming terminal and an outgoing terminal, and the incoming terminal includes a The incoming line L1 side and the incoming line N1 side of the phase and power supply N phase wiring, the outgoing line end includes the outgoing line L side and the outgoing line N side for the power supply L phase and power supply N phase connection respectively, and the circuit board of the circuit breaker is connected to the outgoing line L side It is used to take power between the N side and the outgoing line; when it is connected normally, the power supply L-phase line and the power supply N-phase line enter the line from the incoming line end, and the line exits from the outgoing line end. When the leakage signal acquisition control circuit detects residual current, the leakage current The signal acquisition control circuit controls the tripping circuit to perform the tripping action of the circuit breaker. There is no voltage between the L side of the outgoing line and the N side of the outgoing line, and the circuit board will not burn out; The phase line and the N-phase line of the power supply enter the line from the outlet end, and the line exits from the input end. When the leakage signal acquisition control circuit detects residual current, the leakage signal acquisition control circuit controls the tripping circuit to perform the tripping action of the circuit breaker, and the outgoing line L There is still a voltage between the N side and the N side of the outgoing line, and the control signal output by the leakage signal acquisition control circuit is turned off after the delay time ends, so that the tripping circuit is not turned on, and the circuit board will not be burned.

Further, the leakage signal acquisition control circuit includes a control chip, 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, and the resistor R2 and the resistor R3 are respectively connected in series in the zero sequence Between the two ends of the secondary coil of the transformer and the first pin and the second pin of the control chip, the bidirectional diode D1 and the debugging resistor R1 are sequentially connected in parallel to one side of the resistor R2 and the resistor R3, and the capacitor C1 is connected in parallel to the On the other side of the resistor R2 and the resistor R3, the two ends of the capacitor C2 are respectively connected in parallel between the third pin and the fifth pin of the control chip, and the two ends of the capacitor C3 are respectively connected in parallel with the third pin of the control chip and the sixth pin, the two ends of the capacitor C4 are respectively connected in parallel between the third pin and the seventh pin of the control chip, and the seventh pin of the control chip is connected to the tripping circuit to output the control signal. When the residual current is reached, the control signal output by the control chip is turned off after the delay time ends.

Further, 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 phase of the power supply and the N phase of the power supply, the output terminal of the rectification circuit is connected to the input terminal of the step-down circuit, and the output terminal of the step-down circuit It is connected with the control chip of the leakage signal acquisition control circuit; the power supply circuit also includes a surge absorbing circuit, and the surge absorbing circuit includes a varistor RV1, and the two ends of the varistor RV1 are respectively connected to the L phase of the power supply and the N phase of the power supply.

Further, the rectification circuit is a half-wave rectification circuit, including a diode VD1, the anode of the diode VD1 is connected to the power supply L, and the cathode of the diode VD1 is connected to the input terminal of the step-down circuit.

Further, the step-down circuit includes a chip resistor module composed of a plurality of chip resistors and a capacitor C5, one end of the chip resistor module is connected to the output terminal of the rectifier circuit, and the other end of the chip resistor module is connected to the leakage current The eighth pin of the control chip of the signal acquisition control circuit is connected; one end of the capacitor C5 is connected to the other end of the chip resistor module, and the other end is grounded.

Further, the chip resistor module is composed of a plurality of chip resistors combined in series; or, the chip resistor module is composed of at least two series chip resistor groups connected in parallel, wherein each series chip resistor group is composed of Multiple chip resistors are combined in series; or, the chip resistor module is combined in series by at least two parallel chip resistor groups, wherein each parallel chip resistor group is composed of multiple chip resistors combined in parallel.

Further, the tripping circuit includes a tripping coil KA and a thyristor VT1; the anode of the thyristor VT1 is connected to the power supply L, the cathode of the thyristor VT1 is grounded, the G pole of the thyristor VT1 is connected to the control chip The seventh pin is connected.

Further, the trip coil KA is connected in series between the power circuit and the L phase of the power supply, or the trip coil KA is connected in series between the power circuit and the N phase of the power supply, or the trip coil KA is connected in series between the power circuit and the controllable between silicon VT1.

Further, there is no connection capacitance between the first pin and the second pin of the control chip, no connection resistance between the first pin or the second pin of the control chip and the secondary side of the zero-sequence transformer, and the fourth pin of the control chip The pin is directly grounded or not connected, the seventh pin of the control chip has no grounding capacitor, and there is no parallel bidirectional diode on the secondary side of the zero-sequence transformer.

Further, the leakage test loop includes a normally open test switch S1 and a resistor R4, the normally open test switch S1 and the resistor R4 are connected in series to form a loop, the loop passes through the zero-sequence transformer TA and is connected in parallel to the live wire phase L- of the main circuit Between L1 and neutral phase N-N1.

The trip control signal output by the leakage signal acquisition control circuit of the residual current action circuit breaker circuit of the utility model is automatically closed after a certain time delay, so that the circuit breaker can be normally tripped and the circuit board It will not be burnt out; when it is connected normally, the power supply L-phase line and power supply N-phase line enter the line from the incoming line end, and the line goes out from the outgoing line end, and the circuit board is connected between the outgoing line L side and the outgoing line N side for power. When the signal acquisition control circuit detects the residual current, the leakage signal acquisition control circuit controls the tripping circuit to perform the tripping action of the circuit breaker. There is no voltage between the outgoing line L side and the outgoing line N side. Even if there is residual current, the circuit board will not appear. Burned out; when the circuit breaker’s incoming terminal and terminal connection are reversed, the power supply L-phase line and power supply N-phase line enter the line from the outgoing line end, and the line goes out from the incoming line end, and the circuit board is connected between the outgoing line L side and the outgoing line N side. For taking power, when the leakage signal acquisition control circuit detects residual current, the leakage signal acquisition control circuit controls the tripping circuit to perform the tripping action of the circuit breaker, and there is still voltage between the outgoing line L side and the outgoing line N side, and the leakage signal acquisition control The control signal output by the circuit is turned off after the delay time is over, and at the same time, the residual current is withdrawn with the switch off, so that the tripping circuit is not turned on, the circuit breaker can be tripped normally and the circuit board will not be burned. The power supply circuit also includes a surge absorbing circuit for surge absorbing and surge protection for the circuit. There are various embodiments of the chip resistor module. The chip resistor module is composed of a plurality of chip resistors combined in series; or, the chip resistor module is composed of at least two series chip resistor groups connected in parallel, wherein each A series chip resistor group is composed of multiple chip resistors in series; or, a chip resistor module is composed of at least two parallel chip resistor groups in series, where each parallel chip resistor group is composed of multiple chip resistors Chip resistors are combined in parallel. The location of the tripping coil has various embodiments. The tripping coil KA is connected in series between the power circuit and the L-phase of the power supply, or the tripping coil KA is connected in series between the power circuit and the N-phase of the power supply, or the tripping coil KA is connected in series between the power supply circuit and the N-phase of the power supply. It is connected in series between the power supply circuit and the thyristor VT1.

Description of drawings

Fig. 1 is a structural block diagram of the residual current operated circuit breaker circuit of the present utility model;

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

Fig. 3 is the circuit diagram of the second embodiment of the utility model residual current operated circuit breaker circuit;

Fig. 4 is the circuit diagram of the third embodiment of the utility model residual current operated circuit breaker circuit;

Fig. 5 is the circuit diagram of the first embodiment of the chip resistance module of the present invention;

Fig. 6 is the circuit diagram of the second embodiment of the chip resistance module of the present invention;

Fig. 7 is a circuit diagram of the third embodiment of the chip resistance module of the present invention.

detailed description

The specific implementation manner of the residual current operated circuit breaker circuit of the present invention will be further described below in conjunction with the embodiments given in accompanying drawings 1 to 7 . The residual current operated circuit breaker circuit of the present invention is not limited to the description of the following embodiments.

As shown in Figure 1, the utility model circuit breaker circuit includes a power supply circuit, a tripping circuit, a leakage test circuit and a leakage signal acquisition control 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 .

As shown in Figure 1, the residual current operated circuit breaker circuit of the utility model includes a power supply circuit, a leakage signal acquisition control circuit, a tripping circuit and a test circuit, and the input terminals of the power supply circuit are respectively connected to the L phase of the power supply and the N phase of the power supply , the output end of the power supply circuit is connected with the leakage signal acquisition control circuit and the tripping circuit to provide working power for it, the output end of the leakage signal acquisition control circuit is connected with the tripping circuit, and outputs the tripping signal to the tripping circuit; the leakage signal acquisition The control circuit includes a zero-sequence transformer TA, which monitors the residual current of the main circuit through the zero-sequence transformer TA. When the residual current is detected, the leakage signal acquisition control circuit controls the tripping circuit to perform the tripping action of the circuit breaker, and the leakage signal acquisition control The tripping control signal output by the circuit is turned off after the delay time is over, so that the circuit board will not be burned when the circuit breaker’s incoming line terminal and the terminal are reversed; the circuit breaker includes the incoming line end and the outgoing line end. The terminal includes the incoming line L1 side and the incoming line N1 side for the connection of the power L phase and the power N phase respectively, and the outgoing line end includes the outgoing line L side and the outgoing line N side for the connection of the power L phase and the power N phase respectively; when the normal wiring At this time, the L-phase wire and the N-phase wire of the power supply enter the line from the incoming line and exit from the outgoing line. The circuit board is connected between the L side of the outgoing line and the N side of the outgoing line to take power. When the current is flowing, the leakage signal acquisition control circuit controls the tripping circuit to perform the tripping action of the circuit breaker. There is no voltage between the outgoing line L side and the outgoing line N side. Even if there is residual current, the circuit board will not burn out; when the circuit breaker enters the line When the terminals are connected reversely, the L-phase wire and the N-phase wire of the power supply enter the line from the outlet end, and the wires go out from the inlet end. The circuit board is connected between the L side of the outlet line and the N side of the outlet line to take power. When the acquisition control circuit detects the residual current, the leakage signal acquisition control circuit controls the tripping circuit to perform the tripping action of the circuit breaker, and there is still voltage between the outgoing line L side and the outgoing line N side, and the control signal output by the leakage signal acquisition control circuit After the time is over, it will be closed, and the residual current will be withdrawn with the switch off, so that the tripping circuit will not be turned on and the circuit board will not be burned. The trip control signal output by the leakage signal acquisition control circuit of the residual current action circuit breaker circuit of the utility model is automatically closed after a certain time delay, so that the circuit breaker can be normally tripped and the circuit board Will not burn.

As shown in Figure 2-4, the leakage signal acquisition control circuit includes a control chip, 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, and the resistor R2 and resistor R3 are connected in series. Connected between the two ends of the secondary coil of the zero-sequence transformer and the first pin and the second pin of the control chip, the bidirectional diode D1 and the debugging resistor R1 are sequentially connected in parallel on one side of the resistor R2 and the resistor R3, and the capacitor C1 is connected in parallel to the other side of resistor R2 and resistor R3, the two ends of capacitor C2 are respectively connected in parallel between the third pin and the fifth pin of the control chip, and the two ends of capacitor C3 are respectively connected in parallel to the control chip. Between the third pin and the sixth pin, the two ends of the capacitor C4 are respectively connected in parallel between the third pin and the seventh pin of the control chip, and the seventh pin of the control chip is connected to the tripping circuit for output control Signal, when the residual current is detected, the control signal output by the control chip will be turned off after the delay time ends. When the circuit breaker's incoming terminal and terminal connection are reversed, when the control chip detects the residual current, the control chip controls the tripping circuit to perform the tripping action of the circuit breaker, and there is still voltage between the outgoing line L side and the outgoing line N side, The control signal output by the control chip is turned off after the delay time is over, and at the same time, the residual current is withdrawn with the disconnection of the normally open test switch, so that the tripping circuit is not conducted, the circuit breaker can be tripped normally and the circuit board will not be burned. The utility model can also realize that the control signal is closed after the delay time of the control signal through electronic components or other methods.

Specifically, there is no connection capacitance between the first pin and the second pin of the control chip, no connection resistance between the first pin or the second pin of the control chip and the secondary side of the zero-sequence transformer, and the second pin of the control chip The four pins are directly grounded or not connected, the seventh pin of the control chip has no grounding capacitor, and there is no parallel bidirectional diode on the secondary side of the zero-sequence transformer. The electric leakage signal acquisition control circuit is simpler, the cost is low, and the electric leakage signal acquisition control circuit and the miniaturization of the circuit breaker are facilitated.

As shown in Figure 1-4, 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 phase of the power supply and the N phase of the power supply, and the output terminal of the rectification circuit is connected to the input terminal of the step-down circuit. The output end of the circuit is connected with the control chip of the leakage signal acquisition control circuit; the power supply circuit also includes a surge absorbing circuit, and the surge absorbing circuit includes a varistor RV1, and the two ends of the varistor RV1 are respectively connected to the L phase of the power supply and the N phase of the power supply. connect. Used for surge absorption and surge protection for circuits.

Specifically, the rectification circuit is a half-wave rectification circuit, including a diode VD1, the anode of the diode VD1 is connected to the power supply L, and the cathode of the diode VD1 is connected to the input terminal of the step-down circuit. The rectification circuit can also be full-wave rectification, but the cost of half-wave rectification is lower, and the circuit is more simplified, which is beneficial to the miniaturization of the circuit. The step-down circuit includes a chip resistor module and a capacitor C5 composed of a plurality of chip resistors, one end of the chip resistor module is connected to the output terminal of the rectifier circuit, and the other end of the chip resistor module is connected to the leakage signal acquisition The eighth pin of the control chip of the control circuit is connected; one end of the capacitor C5 is connected to the other end of the chip resistor module, and the other end is grounded.

Specifically, the chip resistor module is composed of a plurality of chip resistors combined in series. Figure 5 shows the first embodiment of the chip resistor module, which consists of a total of eight resistors connected in series: resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, and resistor R12.

The chip resistor module is composed of at least two parallel chip resistor groups combined in series, wherein each parallel chip resistor group is composed of multiple chip resistors connected in parallel. Fig. 6 shows the second embodiment of the chip resistor module, resistor R5 and resistor R6, resistor R7 and resistor R8, resistor R9 and resistor R10, resistor R11 and resistor R12 are respectively connected in parallel to form four parallel chip resistor groups, Four parallel chip resistor groups are connected in series to form a chip resistor module.

The chip resistor module is composed of at least two series chip resistor groups connected in parallel, wherein each series chip resistor group is composed of a plurality of chip resistors connected in series. Figure 7 shows the third embodiment of the chip resistor module, the resistor R5, resistor R7, resistor R9 and resistor R11 are connected in series to form the first chip resistor group, and resistor R6, resistor R8, resistor R10 and resistor R12 are connected in series to form The second chip resistor group, the first chip resistor group and the second chip resistor group are connected in parallel to form a chip resistor module.

As shown in Figure 2-4, the tripping circuit includes a tripping coil KA and a thyristor VT1; the anode of the thyristor VT1 is connected to the power supply L, the cathode of the thyristor VT1 is grounded, and the thyristor VT1 The G pole of the pole is connected with the seventh pin of the control chip. 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. When the circuit breaker’s incoming terminal and terminal connection are reversed, when the control chip detects the residual current, the control chip controls the tripping circuit to perform the tripping action of the circuit breaker, and there is still voltage between the L side of the outgoing line and the N side of the outgoing line. The control signal output by the chip is turned off after the delay time is over, the thyristor VT1 is turned off when the voltage crosses zero, and at the same time, the residual current withdraws as the normally open test switch S1 is turned off, so that the tripping circuit is not turned on, and the circuit breaker can It trips normally and the circuit board will not be burned.

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 phase of the power supply (refer to FIG. 2 ), or the tripping coil KA is connected in series between the power circuit Between phase N of the power supply (refer to FIG. 3 ), or the tripping coil KA is connected in series between the power supply circuit and the thyristor VT1 (refer to FIG. 4 ).

As shown in Figure 2-4, the leakage test circuit includes a normally open test switch S1 and a resistor R4, the normally open test switch S1 and the resistor R4 are connected in series to form a loop, the loop passes through the zero sequence transformer TA and is connected in parallel to the main Between live phase L-L1 and neutral phase N-N1 of 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 .

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.

When the wiring is normal, that is: the power input line is connected between the L1 phase of the power supply and the N1 phase of the power supply, and the circuit board is connected between the L phase of the power supply and the N1 phase of the power supply for taking power. If any leakage is detected at this time, monitor The output signal of the seventh pin of the chip makes the thyristor VT1 turn on, and the control chip controls the tripping circuit to perform the tripping action of the circuit breaker, so that the switch K1 and the switch K2 are tripped, and there is no voltage between the L phase of the power supply and the N phase of the power supply , even if there is residual current, the circuit board will not burn out;

When the wiring is wrong (lower incoming line), that is, when the input terminal of the circuit breaker is reversed, the power input terminal is connected to the power L phase and the power N phase, and the circuit board is connected between the power L phase and the power N phase It is used to take power. At this time, if a leakage is detected, the output signal of the seventh pin of the monitoring chip makes the thyristor VT1 conduct, and the control chip controls the tripping circuit to perform the tripping action of the circuit breaker, so that the switch K1 and the switch K2 trips, the L phase of the power supply and the N phase of the power supply still have voltage, the control signal output by the seventh pin of the control chip is turned off after the delay time is over, and the thyristor VT1 is turned off when the voltage crosses zero, so that the tripping circuit will not be triggered. Conduction, so as to realize the normal tripping of wrong wiring and prevent the burning of electronic components.

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 residual current operated circuit breaker circuit, comprising a power supply circuit, a leakage signal acquisition control circuit, a tripping circuit and a test circuit, is characterized in that: the input end of the power supply circuit is connected with the power supply L phase and the power supply N phase respectively, The output end of the power supply circuit is connected with the leakage signal acquisition control circuit and the tripping circuit to provide working power for it, the output end of the leakage signal acquisition control circuit is connected with the tripping circuit, and outputs the tripping signal to the tripping circuit; the leakage signal acquisition control The circuit includes a zero-sequence transformer TA, which monitors the residual current of the main circuit through the zero-sequence transformer TA. When the residual current is detected, the leakage signal acquisition control circuit controls the tripping circuit to perform the tripping action of the circuit breaker, and the leakage signal acquisition control circuit The output tripping control signal is turned off after the delay time is over, so that the circuit board will not be burned when the incoming terminal of the circuit breaker and the terminal are reversed; The circuit breaker includes an incoming line end and an outgoing line end, the incoming line end includes an incoming line L1 side and an incoming line N1 side for connecting the power supply L phase and the power supply N phase respectively, and the outgoing line end includes a power supply L phase and a power supply N side respectively. The outgoing line L side and the outgoing line N side of the phase connection, the circuit board of the circuit breaker is connected between the outgoing line L side and the outgoing line N side for power taking; When the wiring is normal, the power supply L-phase line and the power supply N-phase line enter the line from the incoming line end and exit from the outgoing line end. When the leakage signal acquisition control circuit detects residual current, the leakage signal acquisition control circuit controls the tripping circuit to execute the circuit breaker. The tripping action, there is no voltage between the outgoing line L side and the outgoing line N side, and the circuit board will not burn out; When the circuit breaker's incoming terminal and terminal connection are reversed, the power supply L-phase line and power supply N-phase line enter the line from the outgoing line terminal and exit from the incoming line terminal. When the leakage signal acquisition control circuit detects residual current, the leakage signal acquisition control The circuit control tripping circuit executes the tripping action of the circuit breaker. There is still voltage between the outgoing line L side and the outgoing line N side. Through, the circuit board will not be burned. 2. The residual current operated circuit breaker circuit according to claim 1, characterized in that: the leakage signal acquisition control circuit includes a control chip, a bidirectional diode D1, a debugging resistor R1, a resistor R2, a resistor R3, a capacitor C1, and a capacitor C2 , capacitor C3, capacitor C4, resistor R2 and resistor R3 are respectively connected in series between the two ends of the secondary coil of the zero-sequence transformer and the first pin and the second pin of the control chip, the bidirectional diode D1 and the debugging resistor R1 Connect in parallel to one side of resistor R2 and resistor R3 in turn, capacitor C1 is connected in parallel to the other side of resistor R2 and resistor R3, and the two ends of capacitor C2 are respectively connected in parallel between the third pin and the fifth pin of the control chip Between, the two ends of the capacitor C3 are respectively connected in parallel between the third pin and the sixth pin of the control chip, and the two ends of the capacitor C4 are respectively connected in parallel between the third pin and the seventh pin of the control chip, The seventh pin of the control chip is connected to the tripping circuit to output a control signal. When a residual current is detected, the control signal output by the control chip is turned off after the delay time expires. 3. The residual current operated circuit breaker circuit according to claim 2, characterized in that: 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 phase of the power supply and the N phase of the power supply, and the rectification circuit The output end of the step-down circuit is connected with the input end of the step-down circuit, and the output end of the step-down circuit is connected with the control chip of the leakage signal acquisition control circuit; the power supply circuit also includes a surge absorbing circuit, and the surge absorbing circuit includes a varistor RV1, a varistor Both ends of the resistor RV1 are respectively connected to the L-phase of the power supply and the N-phase of the power supply. 4. The residual current operated circuit breaker circuit according to claim 3, characterized in that: the rectifier circuit is a half-wave rectifier circuit, including a diode VD1, the anode of the diode VD1 is connected to the power supply L, and the cathode of the diode VD1 is connected to the step-down The input terminal of the voltage circuit is connected. 5. The residual current operated circuit breaker circuit according to claim 3, characterized in that: the step-down circuit comprises a chip resistor module composed of a plurality of chip resistors and a capacitor C5, one end of the chip resistor module Connect to the output end of the rectifier circuit, the other end of the chip resistance module is connected to the eighth pin of the control chip of the leakage signal acquisition control circuit; one end of the capacitor C5 is connected to the other end of the chip resistance module, and the other end is grounded . 6. The residual current operated circuit breaker circuit according to claim 5, characterized in that: the chip resistor module is composed of a plurality of chip resistors connected in series; or, the chip resistor module is composed of at least two chip resistors connected in series Chip resistor groups are combined in parallel, where each series chip resistor group is composed of multiple chip resistors in series; or, the chip resistor module is composed of at least two parallel chip resistor groups in series, where Each parallel chip resistor group is composed of multiple chip resistors connected in parallel. 7. The residual current operated circuit breaker circuit according to claim 2, characterized in that: the tripping circuit includes a tripping coil KA and a thyristor VT1; the anode of the thyristor VT1 is connected to the power supply L, which can be The cathode ground electrode of the thyristor VT1, and the G pole of the thyristor VT1 are connected to the seventh pin of the control chip. 8. The residual current operated circuit breaker circuit according to claim 6, characterized in that: the trip coil KA is connected in series between the power circuit and the L phase of the power supply, or the trip coil KA is connected in series between the power circuit and the power supply Between the N phases, or the tripping coil KA is connected in series between the power supply circuit and the thyristor VT1. 9. The residual current operated circuit breaker circuit according to claim 2, characterized in that: there is no connection capacitor between the first pin and the second pin of the control chip, and the first pin or the second pin of the control chip There is no connection resistance with the secondary side of the zero-sequence transformer, the fourth pin of the control chip is directly grounded or not connected, the seventh pin of the control chip has no grounding capacitor, and there is no parallel bidirectional diode on the secondary side of the zero-sequence transformer. 10. The residual current operated circuit breaker circuit according to claim 1 or 2, characterized in that: the leakage test circuit comprises a normally open test switch S1 and a resistor R4, the normally open test switch S1 and the resistor R4 are connected in series to form a loop, The loop passes through the zero-sequence transformer TA and is connected in parallel between the live phase L-L1 and the neutral phase N-N1 of the main circuit.