Residual current operated relay and residual current protection device
By designing a residual current action relay to convert the AC voltage to DC voltage, the problems of short coil life, high energy consumption and noise in AC contactors are solved, and the effect of extending life and reducing energy consumption and noise is achieved.
Patent Information
- Application Number
- CN202421408316.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-19
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-06-19
AI Technical Summary
The coil life in AC contactors is short, and the energy consumption and noise are large, mainly due to the long-term control of AC contactor suction and connection.
A residual current operation relay is designed to convert the AC voltage into DC voltage through the first control circuit and the voltage conversion circuit, so that the AC contactor is always in the closed state, and avoid long-term use of AC voltage to control the suction.
Extends the life of the coil in the AC contactor and reduces energy consumption and noise.
Smart Images
Figure CN222721126U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of relays, and in particular to a residual current operated relay and a residual current protection device. Background Art
[0002] The residual current operated relay and AC contactor are combined into a residual current protection device. Since the AC voltage controls the AC contactor to be attracted for a long time, the life of the coil in the AC contactor is short, and the energy consumption and noise generated are large. Utility Model Content
[0003] The present application provides a residual current operated relay and a residual current protection device, which can extend the life of a coil in an AC contactor and reduce energy consumption and noise.
[0004] In a first aspect, the present application provides a residual current operated relay, which comprises: a first relay, a second relay, a voltage conversion circuit and a first control circuit.
[0005] The input end of the first control circuit is used to access the first control signal, the output end of the first control circuit is electrically connected to the first end of the coil in the first relay, the second end of the coil in the first relay is used to access the power supply voltage, the first contact of the first relay is electrically connected to the first end of the voltage conversion circuit, the second end of the voltage conversion circuit is electrically connected to the phase line or the neutral line, the second contact of the first relay is electrically connected to the first contact of the second relay, and the third end and the fourth end of the voltage conversion circuit are both used to access the AC voltage.
[0006] The first control circuit is used to connect the first contact of the first relay and the second contact of the first relay according to a first control signal when the second relay is in an open state, and the first control signal is used to control the first relay to close or open.
[0007] The voltage conversion circuit is used to convert AC voltage into DC voltage, and outputs DC voltage when the first contact of the first relay and the second contact of the first relay are connected, so that the residual current operated relay outputs DC voltage.
[0008] By means of the residual current operated relay provided by the first aspect, when the second relay is in the open state, the first control circuit can connect the first contact of the first relay and the second contact of the first relay according to the first control signal for controlling the closing or opening of the first relay, so that the first relay is opened. The voltage conversion circuit can convert the AC voltage into a DC voltage, and when the first contact of the first relay and the second contact of the first relay are connected, the DC voltage can be output, so that the residual current operated relay can output the DC voltage. In this way, under the action of the DC voltage, the AC contactor can be in the closed state all the time. Furthermore, it can be avoided that the residual current operated relay uses the AC voltage to control the closing of the AC contactor for a long time. Thereby, the life of the coil in the AC contactor can be extended, and the energy consumption and noise can be reduced.
[0009] In one possible design, the first control circuit is also used to connect the second contact of the first relay and the third contact of the first relay according to the first control signal after the residual current operated relay is powered on, so as to close the first relay and close the residual current operated relay.
[0010] In a possible design, the first control circuit includes: a switching tube.
[0011] The control end of the switch tube is used to access the first control signal, the first end of the switch tube is electrically connected to the first end of the coil in the first relay, and the second end of the switch tube is grounded.
[0012] In a possible design, the first control circuit also includes: a first resistor and a first capacitor.
[0013] The first end of the first resistor is used to access the first control signal, the second end of the first resistor is electrically connected to the control end of the switch tube, the first end of the first capacitor is electrically connected between the second end of the first resistor and the control end of the switch tube, and the second end of the first capacitor is grounded.
[0014] In a possible design, the first control circuit also includes: a first diode.
[0015] The first end of the first diode is used to access the power supply voltage, and the second end of the first diode is electrically connected between the first end of the switch tube and the first end of the coil in the first relay.
[0016] In one possible design, the voltage conversion circuit includes: a second diode, a third diode, a fourth diode and a fifth diode.
[0017] The first end of the second diode and the first end of the third diode are both electrically connected to the first contact of the first relay, the second end of the second diode is electrically connected to the first end of the fourth diode, the second end of the third diode is electrically connected to the first end of the fifth diode, the second end of the fourth diode and the second end of the fifth diode are both electrically connected to the phase line or the neutral line, the first end of the secondary side of the transformer is electrically connected between the second end of the second diode and the first end of the fourth diode, and the second end of the secondary side of the transformer is electrically connected between the second end of the third diode and the first end of the fifth diode.
[0018] Transformer, used to provide AC voltage to voltage conversion circuits.
[0019] In a possible design, the residual current operated relay further includes: a sixth diode and a seventh diode.
[0020] The first end of the sixth diode is electrically connected to the first contact of the first relay, the second end of the sixth diode is electrically connected to the first end of the voltage conversion circuit, the first end of the seventh diode is electrically connected between the second end of the sixth diode and the first end of the voltage conversion circuit, and the second end of the seventh diode is electrically connected to the second end of the voltage conversion circuit.
[0021] In a possible design, the residual current operated relay further includes: a second resistor and a second capacitor.
[0022] The first end of the second resistor and the first end of the second capacitor are both electrically connected to the second end of the voltage conversion circuit, and the second end of the second resistor and the second end of the second capacitor are both electrically connected to the first contact of the second relay.
[0023] In a possible design, the residual current operated relay further includes: a second control circuit.
[0024] The input end of the second control circuit is used to access the second control signal, the output end of the second control circuit is electrically connected to the first end of the coil in the second relay, the second end of the coil in the second relay is used to access the power supply voltage, and the second contact of the second relay is used to access the mains.
[0025] The second control circuit is used to disconnect the first contact of the second relay and the second contact of the second relay according to a second control signal, and the second control signal is used to control the second relay to close or open.
[0026] In a second aspect, the present application provides a residual current protection device, comprising: an AC contactor and a residual current operated relay in the first aspect and in each possible design of the first aspect.
[0027] The beneficial effects of the residual current protection device provided in the above-mentioned second aspect and each possible design of the above-mentioned second aspect can be referred to the beneficial effects brought about by the above-mentioned first aspect and each possible implementation method of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 A schematic diagram of the structure of a residual current protection device provided in one embodiment of the present application;
[0029] Figure 2 A schematic diagram of the structure of a residual current operated relay provided in one embodiment of the present application. DETAILED DESCRIPTION
[0030] In this application, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c alone can represent: a, b, c, a and b, a and c, or a, b, and c, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.
[0031] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.
[0032] The terms "connected" and "connected" should be understood in a broad sense. For example, the "connected" or "connected" of a circuit structure can refer to not only physical connection, but also electrical connection or signal connection. For example, it can be directly connected, that is, physically connected, or indirectly connected through at least one intermediate element, as long as the circuit is connected, or it can be the internal connection of two elements; signal connection can refer to signal connection through a circuit or through a media medium, such as radio waves. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0033] Usually, the residual current operated relay controls the coil of the power relay in the residual current operated relay through the AC voltage to close the power relay. In this way, the residual current operated relay can output the AC voltage to close the AC contactor. The AC voltage controls the AC contactor to close for a long time, resulting in a short life of the coil in the AC contactor, as well as high energy consumption and noise.
[0034] To this end, the present application provides a residual current operated relay and a residual current protection device.
[0035] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of a residual current protection device provided in one embodiment of the present application. Figure 1 As shown, the residual current protection device 1000 may include: an AC contactor 200 and a residual current operated relay 100 .
[0036] The residual current operated relay 100 can output an AC voltage of, for example, 380V or 220V to close the AC contactor 200. When the AC contactor 200 is closed, that is, when the AC contactor 200 is switched on, the residual current operated relay 100 can be changed from an AC voltage to a DC voltage. In this way, under the action of the DC voltage, the AC contactor 200 can be in a closed state all the time. Furthermore, it is possible to avoid the residual current operated relay 100 using the AC voltage to control the AC contactor 200 to close for a long time. Thus, the life of the coil in the AC contactor can be extended, and energy consumption and noise can be reduced.
[0037] Reference Figure 2 , Figure 2 Shows Figure 1 The schematic diagram of the residual current operated relay in FIG. Figure 2 As shown, the residual current operated relay 100 includes: a first relay K1, a second relay K2, a voltage conversion circuit 120 and a first control circuit 110.
[0038] The input end of the first control circuit 110 is used to access the first control signal Cont_out, the output end of the first control circuit 110 is electrically connected to the first end of the coil in the first relay K1, the second end of the coil in the first relay K1 is used to access the power supply voltage VIN, the first contact of the first relay K1 is electrically connected to the first end of the voltage conversion circuit 120, the second end of the voltage conversion circuit 120 is electrically connected to the phase line L or the neutral line N, the second contact of the first relay K1 is electrically connected to the first contact of the second relay K2, and the third end and the fourth end of the voltage conversion circuit 120 are both used to access the AC voltage AC.
[0039] The first relay K1 , the second relay K2 , the voltage conversion circuit 120 and the first control circuit 110 may be arranged separately or integrated.
[0040] The power supply voltage VIN is, for example, 12V.
[0041] The phase lines are, for example, phase B and phase C.
[0042] In some examples, after the residual current operated relay 100 is powered on, the first control circuit 110 can connect the second contact of the first relay K1 and the third contact of the first relay K1 according to the first control signal Cont_out, so that the first relay K1 is closed. In this way, under the action of the closing of the first relay K1, the second relay K2 can avoid being affected by the first relay K1, that is, the second relay K2 can remain in its original state, so that the second relay K2 can be closed normally, so that the residual current operated relay 100 is closed. Thus, the residual current operated relay 100 can output an AC voltage of, for example, 380V or 220V to control the AC contactor 200 to be attracted.
[0043] For example, the first control signal Cont_out is transmitted to the first control circuit 110 through the single chip microcomputer, so that the first control circuit 110 can obtain the first control signal Cont_out.
[0044] For example, when the first control signal Cont_out is at a high level, the second contact of the first relay K1 and the third contact of the first relay K1 are connected. For example, when the first control signal Cont_out is at a low level, the first contact of the first relay K1 and the second contact of the first relay K1 are connected.
[0045] When the second relay K2 is in the open state, that is, when the residual current operated relay 100 outputs an opening command, the first control circuit 110 can connect the first contact of the first relay K1 and the second contact of the first relay K1 according to the first control signal Cont_out to open the first relay K1.
[0046] The first control signal Cont_out is used to control the first relay K1 to close or open.
[0047] When the second relay K2 is closed, the second relay K2 is opened after a preset time period, such as 100 ms.
[0048] The voltage conversion circuit 120 can convert an AC voltage of, for example, 12V into a DC voltage of 12V. Furthermore, when the first contact of the first relay K1 is connected to the second contact of the first relay K1, that is, when the first relay K1 is opened, the voltage conversion circuit 120 can output a DC voltage of 12V, so that the residual current operated relay 100 can output a DC voltage of 12V. In this way, under the action of the DC voltage of 12V, the AC contactor 200 can remain in a closed state, that is, the AC contactor 200 is always in a closed state. Furthermore, it can be avoided that the residual current operated relay 100 uses the AC voltage to control the closing of the AC contactor 200 for a long time. Thereby, the life of the coil in the AC contactor can be extended, and energy consumption and noise can be reduced.
[0049] Figure 2 In the figure, the first contact of the first relay K1 is marked as 1, the second contact of the first relay K1 is marked as 2, the third contact of the first relay K1 is marked as 3, the first contact of the second relay K2 is marked as 1, and the second contact of the second relay K2 is marked as 2.
[0050] The residual current operated relay and residual current protection device provided by the present application can, when the second relay is in the open state, connect the first contact of the first relay and the second contact of the first relay according to the first control signal for controlling the closing or opening of the first relay, so that the first relay is opened. The voltage conversion circuit can convert the AC voltage into a DC voltage, and when the first contact of the first relay and the second contact of the first relay are connected, the voltage conversion circuit can output a DC voltage so that the residual current operated relay can output a DC voltage. In this way, under the action of the DC voltage, the AC contactor can be in a closed state all the time. Furthermore, it can avoid the residual current operated relay from using the AC voltage to control the closing of the AC contactor for a long time. Thereby, the life of the coil in the AC contactor can be extended, and energy consumption and noise can be reduced.
[0051] Based on the description of the above embodiment, a possible implementation of the first control circuit 110 is exemplified. Figure 2 As shown, the first control circuit 110 may include: a switch tube Q1.
[0052] The control end of the switch tube Q1 is used to receive the first control signal Cont_out, the first end of the switch tube Q1 is electrically connected to the first end of the coil in the first relay K1, and the second end of the switch tube Q1 is grounded.
[0053] In some examples, the switch tube Q1 may be a MOS transistor or a triode, which is not specifically limited in the embodiments of the present application. Figure 2 FIG. 4 illustrates the circuit structure when the switch tube Q1 is a triode.
[0054] For example, when the first control signal Cont_out is at a low level, the switch tube Q1 is turned off. In this way, when the coil in the first relay K1 is not powered, the first contact of the first relay K1 and the second contact of the first relay K1 are connected, so that the first relay K1 is in an open state. Therefore, the first control circuit 110 can connect the first contact of the first relay K1 and the second contact of the first relay K1 according to the first control signal Cont_out.
[0055] In summary, the first control signal controls the switch tube to be turned off, so that the first contact of the first relay is connected with the second contact of the first relay. Thus, the first control circuit can connect the first contact of the first relay with the second contact of the first relay according to the first control signal.
[0056] Based on the description of the above embodiment, another possible implementation of the first control circuit 110 is exemplified. Figure 2 As shown, the first control circuit 110 may further include: a first resistor R1 and a first capacitor C1.
[0057] The first end of the first resistor R1 is used to access the first control signal Cont_out, the second end of the first resistor R1 is electrically connected to the control end of the switch tube Q1, the first end of the first capacitor C1 is electrically connected between the second end of the first resistor R1 and the control end of the switch tube Q1, and the second end of the first capacitor C1 is grounded.
[0058] The current limiting of the first resistor R1 can protect the single chip microcomputer and avoid damage to the single chip microcomputer.
[0059] The first capacitor C1 can filter out interference waves in the first control signal Cont_out, making the first control signal Cont_out more stable.
[0060] In some examples, the first control circuit 110 may further include: a first diode D1 .
[0061] The first end of the first diode D1 is used to access the power supply voltage VIN, and the second end of the first diode D1 is electrically connected between the first end of the switch tube Q1 and the first end of the coil in the first relay K1.
[0062] The first diode D1 can prevent the back electromotive force generated by the coil in the first relay K1 from damaging the first control circuit 110 , so as to protect the components in the first control circuit 110 .
[0063] Based on the description of the above embodiment, a possible implementation of the voltage conversion circuit 120 is exemplified. Figure 2As shown, the voltage conversion circuit 120 may include: a second diode D2, a third diode D3, a fourth diode D4 and a fifth diode D5.
[0064] The first end of the second diode D2 and the first end of the third diode D3 are both electrically connected to the first contact of the first relay K1, the second end of the second diode D2 is electrically connected to the first end of the fourth diode D4, the second end of the third diode D3 is electrically connected to the first end of the fifth diode D5, the second end of the fourth diode D4 and the second end of the fifth diode D5 are both electrically connected to the phase line L or the neutral line N, the first end AC9_1 of the secondary side of the transformer is electrically connected between the second end of the second diode D2 and the first end of the fourth diode D4, and the second end AC9_2 of the secondary side of the transformer is electrically connected between the second end of the third diode D3 and the first end of the fifth diode D5.
[0065] The transformer can provide the voltage conversion circuit 120 with an alternating voltage AC of, for example, 12V. Thus, the alternating voltage AC of 12V can be converted into a direct voltage of 12V through the second diode D2, the third diode D3, the fourth diode D4 and the fifth diode D5.
[0066] Based on the description of the above embodiment, a possible implementation of the residual current operated relay 100 is exemplified. Figure 2 As shown, the residual current operated relay 100 may further include: a sixth diode D6 and a seventh diode D7.
[0067] The first end of the sixth diode D6 is electrically connected to the first contact of the first relay K1, the second end of the sixth diode D6 is electrically connected to the first end of the voltage conversion circuit 120, the first end of the seventh diode D7 is electrically connected between the second end of the sixth diode D6 and the first end of the voltage conversion circuit 120, and the second end of the seventh diode D7 is electrically connected to the second end of the voltage conversion circuit 120.
[0068] The sixth diode D6 is used to prevent reverse voltage, thereby protecting components in the residual current operated relay 100 .
[0069] The seventh diode D7 is used to eliminate the back electromotive force generated by the load, thereby protecting the components in the residual current operated relay 100 .
[0070] In some examples, the residual current operated relay 100 may further include: a second resistor R2 and a second capacitor C2.
[0071] A first end of the second resistor R2 and a first end of the second capacitor C2 are both electrically connected to a second end of the voltage conversion circuit 120 , and a second end of the second resistor R2 and a second end of the second capacitor C2 are both electrically connected to a first contact of the second relay K2 .
[0072] Based on the description of the above embodiment, another possible implementation of the residual current operated relay 100 is exemplified. Figure 2 As shown, the residual current operated relay 100 may further include: a second control circuit 130 .
[0073] The input end of the second control circuit 130 is used to access the second control signal Trip_out, the output end of the second control circuit 130 is electrically connected to the first end of the coil in the second relay K2, the second end of the coil in the second relay K2 is used to access the power supply voltage VIN, and the second contact of the second relay K2 is used to access the AC power UA1.
[0074] For example, the second control signal Trip_out is transmitted to the second control circuit 130 through the single chip microcomputer, so that the second control circuit 130 can obtain the second control signal Trip_out.
[0075] In some examples, the second control circuit 130 may include: a switch tube Q2, a third resistor R3, a third capacitor C3, and an eighth diode D8.
[0076] A first end of the third resistor R3 is used to access the second control signal Trip_out, a second end of the third resistor R3 is electrically connected to the control end of the switch tube Q2, a first end of the switch tube Q2 is electrically connected to the first end of the coil in the second relay K2, a first end of the third capacitor C3 is electrically connected between the second end of the third resistor R3 and the control end of the switch tube Q2, a first end of the eighth diode D8 is used to access the power supply voltage VIN, a second end of the eighth diode D8 is electrically connected between the first end of the switch tube Q2 and the first end of the coil in the second relay K2, and a second end of the third capacitor C3 and a second end of the switch tube Q2 are grounded.
[0077] For example, when the second control signal Trip_out is at a low level, the switch tube Q2 is turned off, so that the power supply voltage VIN cannot supply power to the coil in the second relay K2. In this way, the first contact of the second relay K2 and the second contact of the second relay K2 are disconnected, so that the second control circuit 130 can disconnect the first contact of the second relay K2 and the second contact of the second relay K2. Thus, the second control circuit 130 can disconnect the first contact of the second relay K2 and the second contact of the second relay K2 according to the second control signal Trip_out, so that the second relay K2 is opened, so that EXT-OUT is connected to the mains UA1. Thus, the residual current operated relay 100 can output an AC voltage of, for example, 380V or 220V, so that the AC contactor 200 is closed.
[0078] The second control signal Trip_out is used to control the second relay K2 to close or open.
[0079] In some examples, the residual current operated relay 100 may further include a ninth diode D9 .
[0080] A first end of the ninth diode D9 is electrically connected to the second contact of the second relay K2 , and a second end of the ninth diode D9 is used to access the mains power UA1 .
[0081] In addition, on the basis of the second relay K2 and the second control circuit 130, a second relay K2, a voltage conversion circuit 120 and a first control circuit 110 are additionally provided, that is, on the basis of the basic residual current operated relay 100, by welding the second relay K2, the voltage conversion circuit 120 and the first control circuit 110 on the PCB board, an energy-saving residual current operated relay 100 maintained by direct current voltage can be obtained. In this way, the basic residual current operated relay 100 and the energy-saving residual current operated relay 100 maintained by direct current voltage can be compatible on the same PCB board. Thus, materials can be reduced, costs can be reduced, and large-scale production is convenient.
[0082] Finally, it should be noted that the above embodiments are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.
Claims
1. A residual current operated relay, characterized in that: The residual current operated relay comprises: a first relay, a second relay, a voltage conversion circuit and a first control circuit; The input end of the first control circuit is used to receive a first control signal, the output end of the first control circuit is electrically connected to the first end of the coil in the first relay, the second end of the coil in the first relay is used to receive a power supply voltage, the first contact of the first relay is electrically connected to the first end of the voltage conversion circuit, the second end of the voltage conversion circuit is electrically connected to a phase line or a neutral line, the second contact of the first relay is electrically connected to the first contact of the second relay, and the third end and the fourth end of the voltage conversion circuit are both used to receive an AC voltage; The first control circuit is used for connecting the first contact of the first relay and the second contact of the first relay according to the first control signal when the second relay is in an open state, and the first control signal is used for controlling the first relay to close or open; The voltage conversion circuit is used to convert the AC voltage into a DC voltage, and output the DC voltage when the first contact of the first relay and the second contact of the first relay are connected, so that the residual current operated relay outputs the DC voltage.
2. The residual current operated relay according to claim 1, characterized in that: The first control circuit is also used to connect the second contact of the first relay and the third contact of the first relay according to the first control signal after the residual current operated relay is powered on, so as to close the first relay and close the residual current operated relay.
3. The residual current operated relay according to claim 2, characterized in that: The first control circuit includes: a switch tube; The control end of the switch tube is used to receive the first control signal, the first end of the switch tube is electrically connected to the first end of the coil in the first relay, and the second end of the switch tube is grounded.
4. The residual current operated relay according to claim 3, characterized in that: The first control circuit further includes: a first resistor and a first capacitor; The first end of the first resistor is used to access the first control signal, the second end of the first resistor is electrically connected to the control end of the switch tube, the first end of the first capacitor is electrically connected between the second end of the first resistor and the control end of the switch tube, and the second end of the first capacitor is grounded.
5. The residual current operated relay according to claim 4, characterized in that: The first control circuit further includes: a first diode; The first end of the first diode is used to access the power supply voltage, and the second end of the first diode is electrically connected between the first end of the switch tube and the first end of the coil in the first relay.
6. The residual current operated relay according to claim 3, characterized in that: The voltage conversion circuit includes: a second diode, a third diode, a fourth diode and a fifth diode; The first end of the second diode and the first end of the third diode are both electrically connected to the first contact of the first relay, the second end of the second diode is electrically connected to the first end of the fourth diode, the second end of the third diode is electrically connected to the first end of the fifth diode, the second end of the fourth diode and the second end of the fifth diode are both electrically connected to the phase line or the neutral line, the first end of the secondary side of the transformer is electrically connected between the second end of the second diode and the first end of the fourth diode, and the second end of the secondary side of the transformer is electrically connected between the second end of the third diode and the first end of the fifth diode; The transformer is used to provide the AC voltage to the voltage conversion circuit.
7. The residual current operated relay according to any one of claims 1 to 6, characterized in that: The residual current operated relay further comprises: a sixth diode and a seventh diode; The first end of the sixth diode is electrically connected to the first contact of the first relay, the second end of the sixth diode is electrically connected to the first end of the voltage conversion circuit, the first end of the seventh diode is electrically connected between the second end of the sixth diode and the first end of the voltage conversion circuit, and the second end of the seventh diode is electrically connected to the second end of the voltage conversion circuit.
8. The residual current operated relay according to any one of claims 1 to 6, characterized in that: The residual current operated relay further comprises: a second resistor and a second capacitor; The first end of the second resistor and the first end of the second capacitor are both electrically connected to the second end of the voltage conversion circuit, and the second end of the second resistor and the second end of the second capacitor are both electrically connected to the first contact of the second relay.
9. The residual current operated relay according to any one of claims 1 to 6, characterized in that: The residual current operated relay further comprises: a second control circuit; The input end of the second control circuit is used to receive the second control signal, the output end of the second control circuit is electrically connected to the first end of the coil in the second relay, the second end of the coil in the second relay is used to receive the power supply voltage, and the second contact of the second relay is used to receive the mains; The second control circuit is used to disconnect the first contact of the second relay and the second contact of the second relay according to the second control signal, and the second control signal is used to control the second relay to close or open.
10. A residual current protection device, characterized in that: include: An AC contactor and a residual current operated relay as claimed in any one of claims 1 to 9.