An external circuit breaker controller circuit for an electric energy meter with residual current function

Abstract

The present invention relates to an external circuit breaker controller circuit of an electric energy meter with a residual current function, which comprises: a motor drive circuit, wherein the power supply is single-phase or three-phase electricity; a residual current detection circuit; a handle position detection circuit; an opening and closing state detection circuit; a control circuit, which is used to start the motor drive circuit in response to the detection results of the residual current detection circuit, the handle position detection circuit and the opening and closing state detection circuit; a power supply circuit, which comprises: an input circuit; a step-down circuit; an output circuit; a voltage control circuit, which is used to control the voltage output by the step-down circuit to be within a predetermined range according to the output voltage of the output circuit; an auxiliary power supply arranged between the input circuit and the step-down circuit, which is used to reduce the voltage supplied by the input circuit to a predetermined range and serve as a quick starting voltage of the control circuit, and by setting the auxiliary power supply, the entire circuit is quickly powered by it, so that the circuit breaker can be quickly powered and more reliable protection is achieved.

Description

Technical Field

[0001] The invention belongs to the field of low-voltage electrical appliances, and in particular relates to an external circuit breaker controller circuit of an electric energy meter with a residual current function. Background Art

[0002] At the same time, due to the development of intelligent and unmanned technology, intelligent energy meters with remote power-off and closing functions have become the mainstream energy meters in today's power systems. This type of energy meter generally has an external circuit breaker. The controller of the energy meter controls the opening and closing of the external circuit breaker according to the data of the energy meter and the user's data, thereby realizing remote power-off and closing for the user.

[0003] However, the power supply of such an external circuit breaker is generally stepped down by a transformer, and the power supply has a certain hysteresis when starting, and cannot meet the instantaneous starting of the circuit breaker. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide an external circuit breaker controller circuit for an electric energy meter with a residual current function.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An external circuit breaker controller circuit for an electric energy meter with a residual current function comprises

[0007] A motor drive circuit for disconnecting the power supply between the power supply and the motor, wherein the power supply is single-phase or three-phase electricity;

[0008] A residual current detection circuit for detecting a residual current value;

[0009] A handle position detection circuit for detecting the position of a circuit breaker handle;

[0010] An opening and closing state detection circuit for detecting the opening and closing state of a circuit breaker;

[0011] A control circuit, used for starting the motor drive circuit in response to the detection results of the residual current detection circuit, the handle position detection circuit and the opening and closing state detection circuit;

[0012] A power supply circuit is provided between the power supply and the control circuit, and is used to maintain the voltage supplied by the power supply to the control circuit within a predetermined range.

[0013] The power supply circuit comprises:

[0014] an input circuit for connection to the power supply;

[0015] a step-down circuit for reducing the voltage supplied by the input circuit to a predetermined range;

[0016] An output circuit for supplying a voltage output by the step-down circuit to the control circuit;

[0017] A voltage control circuit, used for controlling the voltage output by the step-down circuit to be within a predetermined range according to the output voltage of the output circuit;

[0018] The auxiliary power supply is arranged between the input circuit and the step-down circuit, and is used to step down the voltage supplied by the input circuit to a predetermined range and serve as a quick start voltage for the control circuit.

[0019] The auxiliary power supply comprises:

[0020] A plurality of resistors and a voltage regulator D3 are connected in series, and a voltage Vls is derived from a node between the resistors and the voltage regulator D3, and the voltage Vls is grounded through a resistor R18 and a capacitor C15 connected in parallel.

[0021] A residual current test circuit is connected in parallel between the two input ends of the input circuit.

[0022] The residual current test circuit includes a tripping coil connected in parallel with the input terminal L phase, the other end of the tripping coil is connected to the anode of the thyristor D2, the cathode of the thyristor D2 is connected to the input terminal N phase, and the control end of the thyristor D2 is electrically connected to the control circuit.

[0023] The residual current detection circuit includes an operational amplifier U5A, the negative input terminal of the operational amplifier U5A is connected to the input terminal of the residual current sampling circuit, the positive input terminal of the operational amplifier U5A is connected to the reference voltage circuit, the output terminal of the operational amplifier U5A is connected to the signal output circuit, the reference voltage circuit and the residual current sampling circuit are respectively connected to two power supply input terminals, the reference voltage circuit includes a resistor R41 and a resistor R42 connected in series, wherein the other end of the resistor R41 is grounded, and the other end of the resistor R42 is connected to the power supply VDD, the connection node of the resistor R41 and the resistor R42 is connected to the positive input terminal of the operational amplifier U5A, the negative input terminal of the operational amplifier U5A is connected to the sampling resistor R39, and a resistor R44 is connected in parallel between the output terminal and the negative input terminal of the operational amplifier U5A.

[0024] Two protection diodes arranged in opposite directions are connected in parallel between the positive input terminal and the negative input terminal of the operational amplifier U5A.

[0025] The handle position detection circuit includes a handle closing position detection circuit and a handle opening position detection circuit.

[0026] The opening and closing state detection circuit includes an optocoupler G1, one end of the switch tube of the optocoupler G1 is connected to the power supply VDD, and the other end is used as a signal output end. The anode of the light-emitting tube of the optocoupler G1 is connected to the detection end, and the cathode of the light-emitting tube of the optocoupler G1 is grounded.

[0027] The controller circuit of the external circuit breaker of the electric energy meter with residual current function is provided with a residual current test circuit, and the leakage test circuit is electrically connected with the control circuit.

[0028] The residual current test circuit comprises:

[0029] Test button circuit for generating residual current test signal;

[0030] The test winding circuit is used to energize the test winding according to the obtained residual current test signal, thereby generating a residual current test action.

[0031] The beneficial effects of the present invention are as follows: by providing an auxiliary power supply, the auxiliary power supply is utilized to quickly supply power to the entire circuit, so that the circuit breaker is quickly powered and more reliable protection is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 FIG. 1 is a partial schematic diagram of a circuit of a power supply circuit of the present invention.

[0033] Figure 2 FIG2 is a partial schematic diagram of a circuit of a power supply circuit of the present invention.

[0034] Figure 3 FIG3 is a partial schematic diagram of the circuit of the power supply circuit of the present invention.

[0035] Figure 4 FIG4 is a partial schematic diagram of the circuit of the power supply circuit of the present invention.

[0036] Figure 5 The figure is a circuit diagram of the motor driving circuit of the present invention.

[0037] Figure 6 The figure is a circuit diagram of the residual current detection circuit of the present invention.

[0038] Figure 7 It is a circuit principle diagram of the handle position detection circuit of the present invention.

[0039] Figure 8 It is a circuit principle diagram of the opening and closing state detection circuit of the present invention.

[0040] Fig. 9 4 is a circuit diagram of the control circuit of the present invention.

[0041] Fig.10 It is a circuit principle diagram of the communication circuit of the present invention.

[0042] Fig.11 It is a circuit principle diagram of the test button circuit of the present invention.

[0043] Fig.12 It is a circuit principle diagram of the test winding circuit of the present invention.

[0044] Fig.13 It is a circuit principle diagram of the manual automatic switching circuit of the present invention. DETAILED DESCRIPTION

[0045] Figure 1 , Figure 2 , Figure 3 as well as Figure 4 Connect them in sequence to form a complete circuit schematic.

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0050] As shown in the figure, the present invention provides

[0051] An external circuit breaker controller circuit for an electric energy meter with a residual current function comprises

[0052] A motor drive circuit for disconnecting the power supply between the power supply and the motor, wherein the power supply is three-phase electricity;

[0053] A residual current detection circuit for detecting a residual current value;

[0054] A handle position detection circuit for detecting the position of a circuit breaker handle;

[0055] An opening and closing state detection circuit for detecting the opening and closing state of a circuit breaker;

[0056] A control circuit, used for starting the motor drive circuit in response to the detection results of the residual current detection circuit, the handle position detection circuit and the opening and closing state detection circuit;

[0057] A power supply circuit is provided between the power supply and the control circuit, and is used to maintain the voltage supplied by the power supply to the control circuit within a predetermined range.

[0058] The power supply circuit comprises:

[0059] An input circuit connected to the power supply; the input circuit includes an input terminal L phase and an input terminal N phase, and a varistor RV3 is connected in parallel between the two to play a role in front-end surge protection;

[0060] A step-down circuit for reducing the voltage supplied by an input circuit to a predetermined range; the step-down circuit, the input end of which is connected to the input circuit, and the output end of which is connected to the output circuit; the step-down circuit comprises a transformer T2, the 1st pin of which is connected to the input circuit, the 4th pin of which is connected to a pin of the voltage control circuit, the 8th pin of which outputs the working voltage, the 7th pin of which is grounded, and the 6th pin of which is connected to another pin of the voltage control circuit via a diode D11 and a resistor R37 in sequence;

[0061] It is used to supply the voltage output by the step-down circuit to the output circuit of the control circuit; it is used to output the working voltage, and its output voltage is 12V. It is preferably connected to the ground through a parallel capacitor C23 and an electrolytic capacitor C24 to achieve filtering of the output voltage. At the same time, the 8th foot of the transformer T2 outputs a voltage of 12V after passing through a diode D13.

[0062] A voltage control circuit, used for controlling the voltage output by the step-down circuit to be within a predetermined range according to the output voltage of the output circuit;

[0063] The auxiliary power supply is arranged between the input circuit and the step-down circuit, and is used to step down the voltage supplied by the input circuit to a predetermined range and serve as a quick start voltage for the control circuit.

[0064] The auxiliary power supply comprises:

[0065] A plurality of resistors and a voltage regulator D3 are connected in series, and a voltage Vls is derived from a node between the resistors and the voltage regulator D3, and the voltage Vls is grounded through a resistor R18 and a capacitor C15 connected in parallel.

[0066] The output end of the input circuit outputs a voltage Vls through a number of resistors connected in series, and the voltage Vls is grounded through a voltage regulator tube D3, a resistor R18, and a capacitor C15 connected in parallel. The output voltage of the input circuit is stepped down by using resistors R11, R14, and R17 connected in series to achieve the output of the voltage Vls, while the voltage regulator tube D3 is used for voltage stabilization, and the resistor R18 and the capacitor C15 are used for filtering to ensure the stability of the output voltage Vls.

[0067] A residual current test circuit is connected in parallel between the two input ends of the input circuit.

[0068] The residual current test circuit includes a tripping coil connected in parallel with the input terminal L phase, the other end of the tripping coil is connected to the anode of the thyristor D2, the cathode of the thyristor D2 is connected to the input terminal N phase, and the control end of the thyristor D2 is electrically connected to the control circuit.

[0069] The leakage test circuit includes a tripping coil connected in parallel with the input terminal L phase, the other end of the tripping coil is connected to the anode of the thyristor D2, the cathode of the thyristor D2 is connected to the input terminal N phase, and the control end of the thyristor D2 is electrically connected to the test signal generating device. The signal generating device is connected to the port trip for sending a residual current test signal, and the port trip is connected to the control end of the thyristor D2 through a resistor, and its control end is also grounded through a capacitor C9 to ensure the reliability of the signal.

[0070] The end of the input terminal L phase connected to the tripping coil is connected in series with a diode D1. By providing the diode D1, the problem of the thyristor being unable to be disconnected is avoided, thereby ensuring the reliability of the residual current test operation.

[0071] A resistor Rx2 is connected in series to one end of the input circuit connected to the auxiliary power supply, and a varistor RV5 is connected in parallel between one end of the resistor Rx2 and the input end N phase.

[0072] A diode D4 is connected in series to one end of the input end of the step-down circuit that is connected to the auxiliary power supply, and the cathode of the diode D4 is grounded via an electrolytic capacitor CB1.

[0073] The voltage control circuit includes a power chip U8 and a protection circuit, which includes a parallel resistor R23, a resistor R24 ​​and a capacitor C22. One end of the parallel resistor R23, the resistor R24 ​​and the capacitor C22 is connected to pin 1 of the transformer T2, and the other end is connected to the cathode of the diode D10. The anode of the diode D10 is connected to pins 5 and 6 of the power chip U8, and pin 4 of the transformer T2 is connected to pins 5 and 6 of the power chip U8. The GND end of the power chip U8 is grounded, and the series resistor R25 at pin 4 of the transformer T2 is grounded.

[0074] Pin 8 of the transformer T2 is connected to pin 3 of the power chip U8 via a resistor R27. Pin 3 of the power chip U8 is also grounded via a resistor R38. Pin 1 of the power chip U8 is grounded via an electrolytic capacitor C29.

[0075] A feedback circuit is provided between the power chip U8 and the output end of the buck circuit, which utilizes primary-side feedback to save eight peripheral devices such as optocouplers and TL431 feedback networks, thereby greatly reducing the number of parts in the power module and reducing costs.

[0076] The output end of the output circuit is electrically connected to the voltage stabilizing circuit.

[0077] The output end of the auxiliary power supply is electrically connected to the voltage stabilizing circuit.

[0078] The voltage stabilizing circuit includes a voltage stabilizing chip U4, whose input end is respectively connected to the power supply 12v and the voltage Vls. The voltage Vls is connected to the input end of the voltage stabilizing chip U4 through a diode D14A, and the voltage 12V is connected to the input end of the voltage stabilizing chip U4 through a diode D14B. When the voltage 12V is not in place, the voltage Vls can be used for fast power supply to provide the working voltage of the entire circuit breaker. The output end of the voltage stabilizing chip outputs the power supply VDD.

[0079] The residual current detection circuit includes an operational amplifier U5A, the negative input terminal of the operational amplifier U5A is connected to the input terminal of the residual current sampling circuit, the positive input terminal of the operational amplifier U5A is connected to the reference voltage circuit, the output terminal of the operational amplifier U5A is connected to the signal output circuit, the reference voltage circuit and the residual current sampling circuit are respectively connected to two power supply input terminals, the reference voltage circuit includes a resistor R41 and a resistor R42 connected in series, and the two series resistors are used to provide a reference voltage, wherein the other end of the resistor R41 is grounded, and the other end of the resistor R42 is connected to the power supply VDD, the connection node of the resistor R41 and the resistor R42 is connected to the positive input terminal of the operational amplifier U5A, and the negative input terminal of the operational amplifier U5A is connected to the sampling resistor R39, and a resistor R44 is connected in parallel between the output terminal and the negative input terminal of the operational amplifier U5A. When residual current is generated, a voltage will be generated when it flows through the sampling resistor R39, and the voltage is compared with the reference voltage to determine the size of the residual current.

[0080] Two protection diodes arranged in opposite directions are connected in parallel between the positive input terminal and the negative input terminal of the operational amplifier. The protection diodes D17 and D16 are used to prevent the residual current detection loop from being open-circuited.

[0081] A resistor R40 is provided between the negative input terminal of the operational amplifier and the sampling resistor R39 , and the resistor R40 and the resistor R44 constitute a peripheral circuit of U5A of the operational amplifier.

[0082] The two power input terminals are grounded via at least one capacitor respectively, and the capacitor is used for high frequency filtering.

[0083] A capacitor C30 is connected in parallel between the two power input terminals for high-frequency filtering.

[0084] The signal output circuit includes a resistor R45 connected in series with the output end of the operational amplifier U5A and a capacitor C40 connected in parallel with the resistor R45, wherein the resistor R45 plays a role of current limiting protection to prevent current shock from damaging the control chip receiving the signal.

[0085] The power source VDD is grounded through a plurality of capacitors, and the power source VDD is filtered by using capacitors C90, C91, C92, C93 and C84 connected in parallel.

[0086] The handle position detection circuit includes a handle closing position detection circuit and a handle opening position detection circuit.

[0087] The two position detection circuits are respectively provided with micro switches S1 and S2. When the handle is moved, the micro switch S1 or micro switch S2 is touched at the opening and closing positions to realize the handle position detection. Detection switches, such as Hall, infrared, etc., can also be used to detect the position of the handle.

[0088] And the signal output end of the handle position detection circuit is connected to the control circuit to obtain the position of the handle in the current state, that is, the opening or closing position.

[0089] The opening and closing state detection circuit includes an optocoupler G1, one end of the switch tube of the optocoupler G1 is connected to the power supply VDD, and the other end is used as a signal output end. The anode of the light-emitting tube of the optocoupler G1 is connected to the detection end, and the cathode of the light-emitting tube of the optocoupler G1 is grounded.

[0090] The opening and closing state detection circuit detects the opening and closing state of the circuit breaker itself. Through the handle position, the opening and closing state of the circuit breaker, and the detected residual current, the control circuit determines how to control the motor drive circuit. It can reliably determine whether the circuit breaker needs to be automatically closed after the circuit breaker is opened manually or due to a line current fault. The structure is simple, and the repeated automatic closing of the circuit breaker is effectively avoided, thereby improving the reliability and safety of the automatic closing of the circuit breaker.

[0091] The controller circuit of the external circuit breaker of the electric energy meter with residual current function is provided with a residual current test circuit, and the residual current test circuit is electrically connected to the control circuit.

[0092] The residual current test circuit comprises:

[0093] A test button circuit for generating a residual current test signal; the test button circuit includes terminals J4 and J6 that can be connected to an external button or other trigger switch, a capacitor C12 is connected in parallel between the two terminals, another terminal is grounded, and another terminal is connected to a power supply VDD by a pull-up resistor R32, and the terminal outputs a residual current test signal through a resistor R34, and the signal is sent to a control circuit, which obtains the signal and outputs a control signal through the signal;

[0094] The test winding circuit is used to energize the test winding and generate a residual current test action according to the obtained residual current test signal. The test winding circuit includes a transistor Q2, whose collector is connected to one end of the test winding, and the other end of the test winding is connected to the power supply 12V through a resistor. The emitter of the transistor is grounded, and its base is connected to the control circuit through a resistor R35, that is, the control circuit outputs a control signal to drive the transistor Q2 to turn on, so that the test winding is energized to realize the leakage test. In addition, a capacitor C13 is connected in parallel between the base and the emitter.

[0095] Furthermore, the invention is also provided with a communication circuit, which is based on the RS485 communication protocol, and includes a communication chip U14, wherein pins 1 and 4 of the chip are respectively connected to the control chip of the control circuit, and are respectively connected to the power supply VDD through pull-up resistors R57 and R59, while pins 2 and 3 are connected to the control chip of the control circuit, and are grounded through resistor R58, while pin 8 is connected to the power supply VDD, and pin 5 is grounded, and a capacitor C43 is connected in parallel between the two, and pins 6 and 7 are two independent paths, which are connected to the communication interface J12, and are respectively connected in series with resistors R80 and R79. In order to ensure the communication quality, an interference protection circuit is provided at the communication interface J12, and the interference protection circuit is a diode D21, a diode D20, and a diode D22. The diode D21 is connected in parallel between the two paths, and the two paths are respectively grounded through diodes D20 and diode D22.

[0096] As an embodiment, a manual-automatic switching circuit may be provided for switching between manual control and automatic control.

[0097] The embodiments should not be regarded as limiting the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. An external circuit breaker controller circuit for an electric energy meter with a residual current function, characterized in that: It includes A motor drive circuit for disconnecting the power supply between the power supply and the motor, wherein the power supply is single-phase or three-phase electricity; A residual current detection circuit for detecting a residual current value; A handle position detection circuit for detecting the position of a circuit breaker handle; An opening and closing state detection circuit for detecting the opening and closing state of a circuit breaker; A control circuit, used for starting the motor drive circuit in response to the detection results of the residual current detection circuit, the handle position detection circuit and the opening and closing state detection circuit; A power supply circuit is provided between the power supply and the control circuit, and is used to maintain the voltage supplied by the power supply to the control circuit within a predetermined range. The power supply circuit comprises: an input circuit for connection to the power supply; a step-down circuit for reducing the voltage supplied by the input circuit to a predetermined range; An output circuit for supplying a voltage output by the step-down circuit to the control circuit; A voltage control circuit, used for controlling the voltage output by the step-down circuit to be within a predetermined range according to the output voltage of the output circuit; The auxiliary power supply is arranged between the input circuit and the step-down circuit, and is used to step down the voltage supplied by the input circuit to a predetermined range and serve as a quick start voltage for the control circuit.

2. The external circuit breaker controller circuit of an electric energy meter with residual current function according to claim 1, characterized in that: The auxiliary power supply comprises: A plurality of series resistors and a voltage regulator D3 are connected in series, and a voltage Vls is derived from a node between the series resistor and the voltage regulator D3, and the voltage Vls is grounded through a resistor R18 and a capacitor C15 connected in parallel.

3. The external circuit breaker controller circuit of an electric energy meter with residual current function according to claim 1, characterized in that: A residual current tripping circuit is connected in parallel between the two input ends of the input circuit.

4. The external circuit breaker controller circuit of an electric energy meter with residual current function according to claim 3 is characterized in that: The residual current tripping circuit includes a leakage coil connected in parallel with the input terminal L phase, the other end of the leakage coil is connected to the anode of the thyristor D2, the cathode of the thyristor D2 is connected to the input terminal N phase, and the control end of the thyristor D2 is electrically connected to the control circuit.

5. The external circuit breaker controller circuit of an electric energy meter with residual current function according to claim 1, characterized in that: The residual current detection circuit includes an operational amplifier U5A, the negative input terminal of the operational amplifier U5A is connected to the input terminal of the residual current sampling circuit, the positive input terminal of the operational amplifier U5A is connected to the reference voltage circuit, the output terminal of the operational amplifier U5A is connected to the signal output circuit, the reference voltage circuit and the residual current sampling circuit are respectively connected to two power supply input terminals, the reference voltage circuit includes a resistor R41 and a resistor R42 connected in series, wherein the other end of the resistor R41 is grounded, and the other end of the resistor R42 is connected to the power supply VDD, the connection node of the resistor R41 and the resistor R42 is connected to the positive input terminal of the operational amplifier U5A, the negative input terminal and the positive input terminal of the operational amplifier U5A are respectively connected to the two ends of the sampling resistor R39, and a resistor R44 is connected in parallel between the output terminal and the negative input terminal of the operational amplifier U5A.

6. The external circuit breaker controller circuit of an electric energy meter with residual current function according to claim 5, characterized in that: Two protection diodes arranged in opposite directions are connected in parallel between the positive input terminal and the negative input terminal of the operational amplifier U5A.

7. The external circuit breaker controller circuit of an electric energy meter with residual current function according to claim 1, characterized in that: The handle position detection circuit includes a handle closing position detection circuit and a handle opening position detection circuit.

8. The external circuit breaker controller circuit of an electric energy meter with residual current function according to claim 1, characterized in that: The opening and closing state detection circuit includes an optocoupler G1, one end of the switch tube of the optocoupler G1 is connected to the power supply VDD, and the other end is used as a signal output end. The anode of the light-emitting tube of the optocoupler G1 is connected to the detection end, and the cathode of the light-emitting tube of the optocoupler G1 is grounded.

9. The external circuit breaker controller circuit of an electric energy meter with residual current function according to claim 1, characterized in that: The controller circuit of the external circuit breaker of the electric energy meter with residual current function is provided with a residual current test circuit, and the residual current test circuit is electrically connected to the control circuit.

10. The external circuit breaker controller circuit of an electric energy meter with residual current function according to claim 9, characterized in that: The residual current test circuit comprises: Test button circuit for generating residual current test signal; The test winding circuit is used to energize the test winding according to the obtained residual current test signal, thereby generating a residual current test action.

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