Reverse wiring residual current protection circuit and protection system

Abstract

The utility model discloses a residual current protection circuit and protection system for reverse wiring. The reverse wiring residual current protection circuit comprises a power supply circuit, an electric leakage detection module, an electric leakage processing chip, an electric leakage trigger switch and an electromagnetic release. The power supply circuit comprises a step-down circuit, the step-down circuit is connected with the electric leakage processing chip, the electromagnetic release is connected with the output end of the step-down circuit, and the step-down circuit is used for providing power for the electric leakage processing chip and the electromagnetic release; the electric leakage detection module sends a detected electric leakage signal to the electric leakage processing chip, the electric leakage processing chip generates a trigger signal according to the electric leakage signal and sends the trigger signal to the electric leakage trigger switch, and the electric leakage trigger switch is conducted after receiving the trigger signal and controls the electromagnetic release to act. According to the utility model, the fault that the silicon controlled rectifier is exploded or the coil of the release is burnt is avoided, and the situation that the circuit breaker leakage mechanism cannot be closed and is continuously in a slide fastener state after leakage release exists in reverse wiring is avoided.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of residual current protection, and in particular to a reverse wiring residual current protection circuit and a protection system. Background Art

[0002] In the application field of electronic residual current operated circuit breakers, the three parts of the rectifier circuit, the control circuit and the action mechanism are used. The rectifier circuit is mainly used to supply power to the control circuit after rectifying the line voltage (some also need to reduce the voltage), the control circuit processes the leakage signal, and the action mechanism performs the leakage action according to the signal result sent by the control circuit.

[0003] Figure 1 This is a working principle diagram of an existing electronic residual current operated circuit breaker. Figure 1 The power module takes power from the main line outlet and rectifies it through 6 diodes to rectify the AC signal into a DC signal (the peak voltage of the DC signal after direct rectification is relatively high, about 1.414 times that of the AC signal). The rectified DC signal is divided by the series resistors R5 and R6 to provide an electrical signal for the leakage processing chip (Integrated Circuit Chip, IC). The rectified electrical signal directly forms a loop with the drive coil L, the first thyristor VT1, and the second thyristor VT2 to form an action loop. Under normal conditions, the thyristor is disconnected and the loop is not conducting. When the main circuit outlet exceeds the expected leakage current, the control circuit is detected by the magnetic ring and the signal is processed. The IC chip sends an electrical signal to be disconnected, triggering the second thyristor VT2 to conduct, that is, the action loop is turned on. After the large current flows through the drive coil L, the coil generates magnetism, and the iron core inside the coil is magnetized and attracted, driving the circuit breaker to work mechanically.

[0004] In this design, the power-taking points are all outlets. After the main circuit of the circuit breaker is disconnected, there is no voltage at the power-taking points, and the leakage protection function stops working. However, if the wiring is reversed, the following problems will occur: the power-taking point will be transformed into the incoming line end. When a leakage signal appears, after the leakage protection main circuit is disconnected, the residual current protection power supply signal still exists, and the thyristor of the drive circuit continues to conduct (this is the component characteristic of the thyristor. The condition for stopping conduction is to disconnect the main circuit (anode) or the main circuit current is reduced to the maintenance current or below. Both conditions are not met in this application). Under the continuous operation of the high current signal, the thyristor will inevitably explode or the coil will burn out; before the thyristor fails, that is, after the reverse wiring has leakage tripping, the tripping circuit will continue to conduct, the driving coil L will continue to work, the leakage mechanism of the circuit breaker will not be able to close, and it will continue to be in a slip state; the design and application of the strong electric drive circuit requires high technical parameters of electronic components, such as thyristor switches. Utility Model Content

[0005] The utility model provides a residual current protection circuit and a protection system with reverse wiring, which can avoid faults such as thyristor explosion or tripping coil burning, and avoid the situation that after leakage tripping occurs in reverse wiring, the leakage mechanism of the circuit breaker cannot be closed and remains in a tripping state continuously.

[0006] According to one aspect of the utility model, a residual current protection circuit with reverse wiring is provided. The residual current protection circuit with reverse wiring includes: a power supply circuit, a leakage detection module, a leakage processing chip, a leakage trigger switch, and an electromagnetic tripping device;

[0007] The power supply circuit includes a buck circuit. The buck circuit is connected to the leakage processing chip. The electromagnetic tripping device is connected to the output end of the buck circuit. The buck circuit is used to supply power to the leakage processing chip and the electromagnetic tripping device;

[0008] The leakage detection module is installed on the AC power supply. The output end of the leakage detection module is connected to the leakage processing chip. The leakage processing chip is connected to the electromagnetic tripping device and the leakage trigger switch. The electromagnetic tripping device is connected to the leakage trigger switch. The leakage detection module is used to send the detected leakage electrical signal to the leakage processing chip. The leakage processing chip is used to generate a trigger signal according to the leakage electrical signal and send it to the leakage trigger switch. The leakage trigger switch is used to conduct after receiving the trigger signal and control the electromagnetic tripping device to act.

[0009] Optionally, the power supply circuit further includes a rectification circuit;

[0010] The rectification circuit is connected between the AC power supply and the buck circuit. The output end of the buck circuit is connected to the electromagnetic tripping device and the leakage processing chip. The control end of the leakage trigger switch is connected to the leakage processing chip. The first end of the leakage trigger switch is connected to the electromagnetic tripping device. The second end of the leakage trigger switch is connected to the rectification circuit. The rectification circuit is used to convert alternating current into direct current. The buck circuit is used to step down the direct current and supply power to the leakage processing chip and the electromagnetic tripping device.

[0011] Optionally, the residual current protection circuit with reverse wiring further includes a button processing circuit. The button processing circuit is connected to the AC power supply. The button processing circuit is used to detect whether the leakage protection of the residual current protection circuit with reverse wiring fails.

[0012] Optionally, the button processing circuit includes a switch and a resistor;

[0013] The first end of the switch is connected to the first power supply line in the AC power supply, the second end of the switch is connected to the first end of the resistor, and the second end of the resistor is connected to the last power supply line in the AC power supply.

[0014] Optionally, the reverse wiring residual current protection circuit further includes a first voltage dividing resistor and a second voltage dividing resistor;

[0015] The first voltage dividing resistor is connected between the leakage handling chip and the leakage trigger switch, and the second voltage dividing resistor is connected between the second end and the third end of the leakage trigger switch.

[0016] Optionally, the reverse wiring residual current protection circuit further includes at least one varistor, and the varistor is connected between the AC power supply and the rectifying circuit.

[0017] Optionally, the leakage trigger switch includes at least one of a switching tube, a triode, an opto-coupled patch relay, and a MOS tube.

[0018] Optionally, the reverse wiring residual current protection circuit further includes a first resistor, a second resistor, a first diode, a second diode, a third resistor, a fourth resistor, and a capacitor;

[0019] The first output end of the leakage detection module is connected to the first end of the first resistor, the first end of the second resistor, the first end of the first diode, the first end of the second diode, and the first end of the third resistor;

[0020] The second output end of the leakage detection module is connected to the second end of the first resistor, the second end of the second resistor, the second end of the first diode, the second end of the second diode, and the first end of the fourth resistor;

[0021] The second end of the third resistor is connected to the first end of the capacitor and the leakage handling chip, and the second end of the fourth resistor is connected to the second end of the capacitor and the leakage handling chip.

[0022] Optionally, the supply voltage of the leakage handling chip includes ±5V - ±12V.

[0023] According to another aspect of the present invention, there is provided a reverse wiring residual current protection system, and the reverse wiring residual current protection system includes the reverse wiring residual current protection circuit according to any one of the above aspects.

[0024] The technical solution of the embodiment of the present utility model provides a residual current protection circuit that overcomes the reverse wiring of an electronic residual current operated circuit breaker. By removing the thyristor device in the circuit, under the continuous operation of a high-current signal, faults such as the thyristor exploding or the tripping coil burning out can be avoided. An electromagnetic tripping device is used to replace the conventional electronic tripping device, avoiding the situation that after a leakage trip occurs due to reverse wiring, the tripping circuit will continuously conduct, and the leakage mechanism of the circuit breaker will not be able to close and will remain in a tripped state continuously. In addition, the electromagnetic tripping device is connected to the back end of the power supply circuit, and the coil of the electromagnetic tripping device is connected to a weak current. The design and application of a weak-current drive circuit are adopted to reduce the high requirements for the technical parameters of electronic components. In summary, the present utility model solves the problems of the existing circuit using a thyristor device, where faults such as the thyristor exploding or the coil burning out occur, and before the thyristor fails, that is, after a leakage trip occurs due to reverse wiring, the tripping circuit will continuously conduct, the electronic operating tripping device will continuously operate, the leakage mechanism of the circuit breaker will not be able to close, and the product will remain in a tripped state continuously.

[0025] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present utility model, nor is it used to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 is the working principle diagram of an existing electronic residual current operated circuit breaker;

[0028] Figure 2 is the structural schematic diagram of a residual current protection circuit with reverse wiring provided according to an embodiment of the present utility model;

[0029] Figure 3 is the structural schematic diagram of another residual current protection circuit with reverse wiring provided according to an embodiment of the present utility model;

[0030] Figure 4 is the working principle diagram of a residual current protection circuit with reverse wiring provided according to an embodiment of the present utility model;

[0031] Figure 5 is the working principle diagram of another residual current protection circuit with reverse wiring provided according to an embodiment of the present utility model;

[0032] Figure 6 It is the working schematic diagram of another reverse-wiring residual current protection circuit provided according to an embodiment of the present utility model;

[0033] Figure 7 It is the working schematic diagram of another reverse-wiring residual current protection circuit provided according to an embodiment of the present utility model;

[0034] Figure 8 It is the working schematic diagram of another reverse-wiring residual current protection circuit provided according to an embodiment of the present utility model;

[0035] Figure 9 It is the working schematic diagram of another reverse-wiring residual current protection circuit provided according to an embodiment of the present utility model;

[0036] Figure 10 It is the working schematic diagram of another reverse-wiring residual current protection circuit provided according to an embodiment of the present utility model;

[0037] Figure 11 It is the working schematic diagram of another reverse-wiring residual current protection circuit provided according to an embodiment of the present utility model;

[0038] Figure 12 It is the working schematic diagram of another reverse-wiring residual current protection circuit provided according to an embodiment of the present utility model. Specific embodiments

[0039] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0040] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0041] Figure 2 It is a schematic structural diagram of a residual current protection circuit with reverse wiring according to an embodiment of the present invention. Refer to Figure 2 , an embodiment of the present invention provides a residual current protection circuit with reverse wiring. The residual current protection circuit with reverse wiring includes: a power supply circuit 10, a leakage detection module 20, a leakage processing chip 30, a leakage trigger switch 40, and an electromagnetic release 50; the power supply circuit 10 includes a step-down circuit 12, the step-down circuit 12 is connected to the leakage processing chip 30, the electromagnetic release 50 is connected to the output end of the step-down circuit 12, and the step-down circuit 12 is used to provide power for the leakage processing chip 30 and the electromagnetic release 50; the leakage detection module 20 is installed on the AC power supply, the output end of the leakage detection module 20 is connected to the leakage processing chip 30, the leakage processing chip 30 is connected to the electromagnetic release 50 and the leakage trigger switch 40, the electromagnetic release 50 is connected to the leakage trigger switch 40, the leakage detection module 20 is used to send the detected leakage electrical signal to the leakage processing chip 30, the leakage processing chip 30 is used to generate a trigger signal according to the leakage electrical signal and send it to the leakage trigger switch 40, and the leakage trigger switch 40 is used to conduct after receiving the trigger signal and control the electromagnetic release 50 to act.

[0042] Specifically, the power supply circuit 10 can convert the alternating current on the main circuit AC power supply into pulsating direct current, and then after being stepped down by the step-down circuit 12, the DC voltage is reduced to the voltage value required by the leakage processing chip 30 (IC chip), and voltage is provided for the leakage processing chip 30 and the electromagnetic release 50 to work. The step-down circuit 12 is arranged at the front end of the electromagnetic release 50, and the coil inside the electromagnetic release 50 is connected to weak electricity, adopting a weak electricity drive circuit design and application, reducing the high requirements for the technical parameters of electronic components.

[0043] The leakage detection module 20 can be a magnetic ring (TA), and the leakage processing chip 30 is responsible for processing the leakage electrical signal induced by the front-end magnetic ring to the secondary side of the magnetic ring, including signal amplification, signal processing, signal comparison, etc. When the leakage electrical signal meets the leakage action condition, the leakage processing chip 30 will release a trigger signal to the leakage trigger switch 40. The leakage trigger switch 40 can be a switching tube, and after receiving the leakage trigger signal, it will conduct and control the electromagnetic release 50 to act, driving the operating mechanism to disconnect. When the leakage trigger signal released by the leakage processing chip 30 disappears, the leakage trigger switch 40 immediately disconnects, and the leakage protection circuit is disconnected.

[0044] Description of the working mechanism of the electronic action release: A current (relatively large required current) flows through the coil, magnetizing the moving iron core and the static iron core. After magnetization, the moving iron core and the static iron core are attracted to each other, and the displacement of the moving iron core pushes the displacement of the ejector rod to achieve tripping. Description of the working mechanism of the electromagnetic action release: In the case of no leakage current, there is a magnetic circuit 2 generated by the permanent magnet inside, magnetizing the armature and the yoke, so that the magnet and the yoke generate an attractive force greater than the pulling force of the reaction spring. When a leakage current occurs in the power supply circuit, magnetic circuits 1 and 2 will be generated inside. Magnetic circuit 1 will generate a reverse demagnetizing force F. When the reverse demagnetizing force and the reaction of the reaction spring are greater than the attractive force between the magnet and the yoke, tripping is achieved.

[0045] Since this embodiment does not adopt an electronic release, but an electromagnetic release 50, the current required to drive the electromagnetic release 50 is smaller, which is different from the conventional electronic coil release that requires a large current to pass through the coil to magnetize the iron core. Therefore, the electromagnetic release 50 no longer requires high-current drive. After the leakage trigger switch 40 is closed and conducted, the entire leakage action circuit is conducted. After the current flows through the coil inside the electromagnetic release 50, the generated magnetic flux cancels out the magnetic flux of the release itself, and the electromagnetic release acts to drive the action mechanism to disconnect, thereby protecting the main circuit from being disconnected.

[0046] The technical solution of the embodiment of the present invention provides a residual current protection circuit that overcomes the reverse wiring of the electronic residual current operated circuit breaker. By removing the thyristor device in the circuit, under the continuous operation of the high-current signal, the faults of the thyristor being blown or the release coil being burned are avoided. An electromagnetic release is used to replace the conventional electronic release, avoiding that after the reverse wiring has a leakage trip, the trip circuit will continue to conduct, and the leakage mechanism of the circuit breaker will not be able to close and will remain in the tripping state continuously. In addition, the electromagnetic release is connected to the rear end of the power supply circuit, and the coil of the electromagnetic release is connected to a weak current. The design and application of the weak-current drive circuit reduce the high requirements for the technical parameters of electronic components. In summary, the present invention solves the problems that in the existing circuit using a thyristor device, the thyristor is blown or the coil is burned, and before the thyristor fails, that is, after the reverse wiring has a leakage trip, the trip circuit will continue to conduct, the electronic action release will continue to work, the leakage mechanism of the circuit breaker will not be able to close, and the product will remain in the tripping state continuously.

[0047] Figure 3 It is a structural schematic diagram of another residual current protection circuit with reverse wiring provided according to the embodiment of the present invention. Refer to Figure 3 , Optionally, the power supply circuit 10 further includes a rectifier circuit 11;

[0048] The rectifier circuit 11 is connected between the AC power supply and the step-down circuit 12. The output end of the step-down circuit 12 is connected to the electromagnetic release 50 and the leakage processing chip 30. The control end of the leakage trigger switch 40 is connected to the leakage processing chip 30. The first end of the leakage trigger switch 40 is connected to the electromagnetic release 50, and the second end of the leakage trigger switch 40 is connected to the rectifier circuit 11. The rectifier circuit 11 is used to convert alternating current into direct current, and the step-down circuit 12 is used to step down the direct current and supply power to the leakage processing chip 30 and the electromagnetic release 50.

[0049] Specifically, the rectifier circuit 11 converts the AC voltage on the main circuit AC power supply into a pulsating DC voltage. After being stepped down by the step-down circuit 12, the DC voltage is reduced to the voltage value required by the IC chip and supplies voltage for the leakage processing chip 30 to work. The electromagnetic release 50 is connected to the rear end of the step-down circuit 12, and the coil inside it is connected to a weak current, avoiding the situation of the coil being burned out and reducing the high requirements for the technical parameters of electronic components.

[0050] Continue to refer to Figure 3 Optionally, the supply voltage of the leakage processing chip 30 includes ±5V - ±12V.

[0051] Specifically, because the working mechanism of the electromagnetic release 50 itself does not require a large voltage and large current, the power take-off point of the electromagnetic release 50 can be connected to the positive and negative 12V or 5V voltage after rectification and step-down (this voltage can be adjusted according to the voltage required for the power supply of the IC chip).

[0052] Continue to refer to Figure 3 Optionally, the reverse-wiring residual current protection circuit further includes a button processing circuit 60. The button processing circuit 60 is connected to the AC power supply, and the button processing circuit 60 is used to detect whether the leakage protection of the reverse-wiring residual current protection circuit fails.

[0053] Figure 4 It is the working principle diagram of a reverse-wiring residual current protection circuit provided according to an embodiment of the present invention. Refer to Figure 4 Optionally, the button processing circuit 60 includes a switch S1 and a resistor R0;

[0054] The first end of the switch S1 is connected to the first power supply line N in the AC power supply, the second end of the switch S1 is connected to the first end of the resistor R0, and the second end of the resistor R0 is connected to the last power supply line L in the AC power supply.

[0055] Specifically, the button processing circuit 60 can detect the leakage performance of the reverse-wiring residual current protection circuit, and the resistor R1 can be a chip resistor for simulating the leakage current.

[0056] Continue to refer to Figure 4, optionally, the reverse-wired residual current protection circuit further includes a first voltage-dividing resistor R11 and a second voltage-dividing resistor R12;

[0057] The first voltage-dividing resistor R11 is connected between the leakage handling chip 30 and the leakage trigger switch 40, and the second voltage-dividing resistor R12 is connected between the second end and the third end of the leakage trigger switch 40.

[0058] Continue to refer to Figure 4 , optionally, the reverse-wired residual current protection circuit further includes at least one varistor RV, and the varistor RV is connected between the AC power supply and the rectification circuit 11.

[0059] Specifically, the varistor RV is used to perform voltage clamping when the circuit withstands overvoltage, and absorb the excess current to protect sensitive devices. The number of varistors RV can be one or more, and is specifically selected and set according to the type of the AC power supply.

[0060] Continue to refer to Figure 4 , optionally, the reverse-wired residual current protection circuit further includes a first resistor R1, a second resistor R2, a first diode D1, a second diode D2, a third resistor R3, a fourth resistor R4, and a capacitor C;

[0061] The first output terminal of the leakage detection module 20 is connected to the first end of the first resistor R1, the first end of the second resistor R2, the first end of the first diode D1, the first end of the second diode D2, and the first end of the third resistor R3;

[0062] The second output terminal of the leakage detection module 20 is connected to the second end of the first resistor R1, the second end of the second resistor R2, the second end of the first diode D1, the second end of the second diode D2, and the first end of the fourth resistor R4;

[0063] The second end of the third resistor R3 is connected to the first end of the capacitor C and the leakage handling chip 30, and the second end of the fourth resistor R4 is connected to the second end of the capacitor C and the leakage handling chip 30.

[0064] Specifically, the first resistor R1, the second resistor R2, the first diode D1, the second diode D2, the third resistor R3, the fourth resistor R4, and the capacitor C mainly play roles of assistance, filtering, and current limiting.

[0065] Continue to refer to Figure 4 , optionally, the leakage trigger switch 40 includes at least one of a switching tube, a triode, an optocoupler patch relay, and a MOS tube.

[0066] Specifically, since the leakage action circuit uses low voltage and low current, the requirements for the leakage trigger switch 40 are also greatly reduced, and small-power components such as switching transistors, triodes, optocoupler surface-mount relays, and MOS transistors can be used. After selecting the switching transistor Q1 as shown in Figure 4 , there is no defect such as the thyristor being locked and unable to disconnect after conduction. When the leakage trigger signal disappears, the switching transistor Q1 disconnects, and the leakage protection circuit is disconnected.

[0067] Figure 5 FIG. Figure 6 FIG. is a schematic diagram of the working principle of another reverse-wiring residual current protection circuit according to an embodiment of the present invention. Refer to Figure 5 and Figure 6 , Figure 5 which shows the case of a three-phase three-wire AC power supply. Figure 6 FIG. shows the case of a three-phase four-wire AC power supply.

[0068] Figure 7 FIG. is a schematic diagram of the working principle of another reverse-wiring residual current protection circuit according to an embodiment of the present invention. Figure 8 FIG. is a schematic diagram of the working principle of another reverse-wiring residual current protection circuit according to an embodiment of the present invention. Figure 9 FIG. is a schematic diagram of the working principle of another reverse-wiring residual current protection circuit according to an embodiment of the present invention. Refer to Figure 7 , Figure 8 and Figure 9 , Figure 7 , Figure 8 and Figure 9 which shows the case where the leakage trigger switch is a MOS transistor.

[0069] Figure 10 FIG. is a schematic diagram of the working principle of another reverse-wiring residual current protection circuit according to an embodiment of the present invention. Figure 11 FIG. is a schematic diagram of the working principle of another reverse-wiring residual current protection circuit according to an embodiment of the present invention. Figure 12 FIG. is a schematic diagram of the working principle of another reverse-wiring residual current protection circuit according to an embodiment of the present invention. Refer to Figure 10 , Figure 11 and Figure 12 , Figure 10 , Figure 11 and Figure 12 which shows the case where the leakage trigger switch is an optocoupler surface-mount relay.

[0070] An embodiment of the present utility model further provides a reverse-wired residual current protection system, which includes the reverse-wired residual current protection circuit provided by any embodiment of the present utility model.

[0071] Since the reverse-wired residual current protection system includes the reverse-wired residual current protection circuit provided by any embodiment of the present utility model, the beneficial effects of the above-mentioned reverse-wired residual current protection system and the reverse-wired residual current protection circuit are the same, and will not be elaborated here.

[0072] The above specific implementation manners do not constitute a limitation to the protection scope of the present utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A residual current protection circuit with reverse wiring, characterized in that Including: A power supply circuit, a leakage detection module, a leakage processing chip, a leakage trigger switch, and an electromagnetic release; The power supply circuit includes a step-down circuit, the step-down circuit is connected to the leakage processing chip, the electromagnetic release is connected to the output end of the step-down circuit, and the step-down circuit is used to provide power for the leakage processing chip and the electromagnetic release; The leakage detection module is installed on the AC power supply, the output end of the leakage detection module is connected to the leakage processing chip, the leakage processing chip is connected to the electromagnetic release and the leakage trigger switch, the electromagnetic release is connected to the leakage trigger switch, the leakage detection module is used to send the detected leakage electrical signal to the leakage processing chip, the leakage processing chip is used to generate a trigger signal according to the leakage electrical signal and send it to the leakage trigger switch, and the leakage trigger switch is used to conduct after receiving the trigger signal and control the action of the electromagnetic release.

2. The circuit according to claim 1, wherein The power supply circuit further includes a rectification circuit; The rectification circuit is connected between the AC power supply and the step-down circuit, the output end of the step-down circuit is connected to the electromagnetic release and the leakage processing chip, the control end of the leakage trigger switch is connected to the leakage processing chip, the first end of the leakage trigger switch is connected to the electromagnetic release, the second end of the leakage trigger switch is connected to the rectification circuit, the rectification circuit is used to convert alternating current into direct current, and the step-down circuit is used to step down the direct current and supply power to the leakage processing chip and the electromagnetic release.

3. The circuit according to claim 1, wherein It further includes a button processing circuit, the button processing circuit is connected to the AC power supply, and the button processing circuit is used to detect whether the leakage protection of the reverse-wiring residual current protection circuit fails.

4. The circuit according to claim 3, wherein The button processing circuit includes a switch and a resistor; The first end of the switch is connected to the first power supply wire in the AC power supply, the second end of the switch is connected to the first end of the resistor, and the second end of the resistor is connected to the last power supply wire in the AC power supply.

5. The circuit according to claim 1, wherein It further includes a first voltage-dividing resistor and a second voltage-dividing resistor; The first voltage-dividing resistor is connected between the leakage processing chip and the leakage trigger switch, and the second voltage-dividing resistor is connected between the second end and the third end of the leakage trigger switch.

6. The circuit according to claim 2, characterized in that, It further includes at least one varistor, and the varistor is connected between the AC power supply and the rectification circuit.

7. The circuit according to claim 1, wherein The leakage trigger switch includes at least one of a switching tube, a triode, an optocoupler surface-mount relay, and a MOS tube.

8. The circuit according to claim 1, characterized in that It further includes a first resistor, a second resistor, a first diode, a second diode, a third resistor, a fourth resistor, and a capacitor; The first output end of the leakage detection module is connected to the first end of the first resistor, the first end of the second resistor, the first end of the first diode, the first end of the second diode, and the first end of the third resistor; The second output terminal of the leakage detection module is connected to the second terminal of the first resistor, the second terminal of the second resistor, the second terminal of the first diode, the second terminal of the second diode, and the first terminal of the fourth resistor; The second terminal of the third resistor is connected to the first terminal of the capacitor and the leakage processing chip, and the second terminal of the fourth resistor is connected to the second terminal of the capacitor and the leakage processing chip.

9. The circuit according to claim 1, wherein The supply voltage of the leakage processing chip includes ±5V - ±12V.

10. A residual current protection system with reverse wiring, characterized in that, It includes the residual current protection circuit with reverse wiring according to any one of claims 1-9.

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