CN219576638U

CN219576638U - Leakage detection interrupt circuit, leakage detection interrupt device and electrical equipment

Info

Publication number: CN219576638U
Application number: CN202320148130.4U
Authority: CN
Inventors: 王华科; 牛力伟
Original assignee: Guangzhou Hualing Refrigeration Equipment Co Ltd
Current assignee: Guangzhou Hualing Refrigeration Equipment Co Ltd
Priority date: 2022-10-09
Filing date: 2023-01-16
Publication date: 2023-08-22
Anticipated expiration: 2033-01-16
Also published as: CN117856173A; CN219247472U

Abstract

The utility model discloses a leakage detection interrupt circuit, a leakage detection interrupt device and electrical equipment, wherein the circuit is suitable for being connected between a power input end and a load, and comprises: the switch unit is configured to control whether a power supply of the power supply input end is connected; a switch driving unit configured to control on-off of the switch unit; the screening unit is suitable for being wrapped on the load power supply line to perform electric leakage detection on the load power supply line; the detection unit is respectively connected with the shielding unit and the switch driving unit and is configured to trigger the switch driving unit to control the switch unit to be disconnected when the shielding unit is detected to be opened so as to cut off the access of the power supply. The circuit can cut off the access of the power supply when the metal shielding wire is opened, thereby preventing the danger caused by the fact that the leakage cannot be detected in time and playing a role in protection and safety.

Description

Leakage detection interrupt circuit, leakage detection interrupt device and electrical equipment

Cross Reference to Related Applications

The present utility model claims priority from chinese patent application No. 202211229293.1 entitled "leakage detection interrupt circuit and leakage detection interrupt" filed on 10/09 of 2022, the entire contents of which are incorporated herein by reference.

Technical Field

The utility model relates to the technical field of electric leakage detection, in particular to an electric leakage detection interrupt circuit, an electric leakage detection interrupt device and electrical equipment.

Background

At present, the leakage protection technology generally detects whether leakage occurs, and cuts off the power supply to realize protection when leakage occurs. However, when the device for detecting the electric leakage is damaged and cannot detect whether the electric leakage occurs, if the electric leakage occurs, the above technology cannot detect the electric leakage, and thus the power supply cannot be cut off, so that potential safety hazard is caused.

Disclosure of Invention

An object of the present utility model is to provide a leakage detection interrupt circuit, a leakage detection interrupt device, and an electrical apparatus, so as to perform protection and safety functions by detecting in time through a detection unit when a metal shielding wire is opened.

To achieve the above object, a first aspect of the present utility model proposes a leakage detection interrupt circuit adapted to be connected between a power supply input terminal and a load, the circuit comprising: a switch unit configured to control whether a power supply of the power supply input terminal is connected; a switch driving unit configured to control on-off of the switch unit; the shielding unit is suitable for being wrapped on a load power supply line so as to perform electric leakage detection on the load power supply line; the detection unit is respectively connected with the shielding unit and the switch driving unit and is configured to trigger the switch driving unit to control the switch unit to be disconnected when the shielding unit is detected to be open so as to cut off the access of the power supply.

In order to achieve the above object, a second aspect of the present utility model provides a leakage detection interrupt device, including the leakage detection interrupt circuit.

In order to achieve the above object, a third aspect of the present utility model provides an electrical apparatus, including the above-mentioned leakage detection interrupter.

According to the leakage detection interrupt circuit, the leakage detection interrupt device and the electrical equipment, when the detection unit detects that the metal shielding wire is opened, the switch driving unit controls the switch unit to be opened so as to cut off the power supply, so that danger caused by incapability of timely detecting leakage is prevented, and protection and safety effects are achieved.

Drawings

FIG. 1 is a schematic diagram of a leakage detection interrupt circuit in some embodiments of the utility model;

FIG. 2 is a schematic diagram of a plug using a leakage detection interrupt circuit according to one embodiment of the present utility model;

fig. 3 (a) is a schematic view of a plug connection line according to a first embodiment of the present utility model;

fig. 3 (b) is a schematic view of a plug connection according to a second embodiment of the present utility model;

fig. 3 (c) is a schematic view of a plug connection line according to a third embodiment of the present utility model;

fig. 3 (d) is a schematic view of a plug connection line according to a fourth embodiment of the present utility model;

Fig. 3 (e) is a schematic view of a plug connection line according to a fifth embodiment of the present utility model;

FIG. 4 is a topology of a leakage detection interrupt circuit according to a first embodiment of the present utility model;

FIG. 5 is a topology of a leakage detection interrupt circuit according to a second embodiment of the present utility model;

FIG. 6 is a topology of a leakage detection interrupt circuit according to a third embodiment of the present utility model;

FIG. 7 is a topology of a leakage detection interrupt circuit according to a fourth embodiment of the present utility model;

FIG. 8 is a topology of a leakage detection interrupt circuit according to a fifth embodiment of the present utility model;

FIG. 9 is a topology of a leakage detection interrupt circuit according to a sixth embodiment of the present utility model;

FIG. 10 is a topology of a leakage detection interrupt circuit according to a seventh embodiment of the present utility model;

FIG. 11 is a topology of a leakage detection interrupt circuit according to an eighth embodiment of the present utility model;

FIG. 12 is a topology of a leakage detection interrupt circuit according to a ninth embodiment of the present utility model;

FIG. 13 is a topology of a leakage detection interrupt circuit according to a tenth embodiment of the present utility model;

FIG. 14 is a topology of a leakage detection interrupt circuit according to an eleventh embodiment of the present utility model;

FIG. 15 is a topology of a leakage detection interrupt circuit according to a twelfth embodiment of the present utility model;

FIG. 16 is a topology of a leakage detection interrupt circuit in accordance with a thirteenth embodiment of the present utility model;

FIG. 17 is a topology of a leakage detection interrupt circuit according to a fourteenth embodiment of the present utility model;

fig. 18 is a topology of a leakage detection interrupt circuit according to a fifteenth embodiment of the present utility model;

FIG. 19 is a topology of a leakage detection interrupt circuit according to a sixteenth embodiment of the present utility model;

FIG. 20 is a topology of a leakage detection interrupt circuit according to a seventeenth embodiment of the present utility model;

FIG. 21 is a topology of a leakage detection interrupt circuit according to an eighteenth embodiment of the present utility model;

fig. 22 is a topology diagram of a leakage detection interrupt circuit according to a nineteenth embodiment of the present utility model;

FIG. 23 is a topology of a leakage detection interrupt circuit according to a twentieth embodiment of the present utility model;

FIG. 24 is a topology of a leakage detection interrupt circuit according to a twenty-first embodiment of the present utility model;

FIG. 25 is a topology of a leakage detection interrupt circuit according to a twenty-second embodiment of the utility model;

FIG. 26 is a block diagram of a leakage detection interrupter according to an embodiment of the utility model;

fig. 27 is a block diagram of an electrical device according to an embodiment of the present utility model.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

The following describes a leak detection interrupt circuit, a leak detection interrupt, and an electrical device according to an embodiment of the present utility model with reference to fig. 1 to 27.

Fig. 1 is a schematic diagram of a leakage detection interrupt circuit in some embodiments of the utility model.

As shown in fig. 1, the leakage detection interrupt circuit 100 is adapted to be connected between a power supply input (e.g., an alternating current AC input) and a LOAD (e.g., an electrical device in an air conditioner). The circuit 100 includes: a switching unit 10, a switching driving unit 11, a shielding unit 12, and a detecting unit 13.

Referring to fig. 1, a switching unit 10 is used to control whether a power source (e.g., AC power source) at a power input terminal is connected; the switch driving unit 11 is used for controlling the on-off of the switch unit 10; the shielding unit 12 is used for wrapping the load power supply line to perform electric leakage detection on the load power supply line; the detection unit 13 is connected to the shielding unit 12 and the switch driving unit 11, respectively, and is configured to trigger the switch driving unit 11 to control the switch unit 10 to be turned off when detecting that the shielding unit 12 is opened, so as to cut off the power AC.

In some embodiments, the detecting unit 13 is further configured to trigger the switch driving unit 11 to control the switch unit 10 to be turned off when detecting that a leakage current flows through the shielding unit 12, so as to cut off the power AC, thereby realizing protection when the leakage occurs.

In particular, referring to fig. 1, the load supply lines comprise a live line connection line and a neutral line connection line. For three phase lines, the load supply lines may also include ground connection lines. The switching unit 10 is used for establishing a connection between a load supply line and a live line L, a neutral line N of a power supply AC, wherein the live line connection line is used for connecting the live line L of the power supply AC, the neutral line connection line is used for connecting the neutral line N of the power supply AC, and the ground line connection line is used for connecting the ground line PE of the power supply AC. The shielding unit 12 may include a metal shielding wire corresponding to the live wire connection wire and/or the neutral wire connection wire, and may further include a wire connected to the metal shielding wire, where the detecting unit 13 is connected to the metal shielding wire and the switch driving unit 11, and is configured to trigger the switch driving unit 11 to control the switch unit 10 to be turned off to cut off the power AC when an open circuit (such as disconnection of the metal shielding wire) of the shielding unit 12 is detected. Thereby, the danger caused by the failure to timely detect the electric leakage due to the open circuit of the shielding unit 12 can be prevented, and the protection and safety functions are achieved

In some embodiments, referring to fig. 1 and 4, the shielding unit 12 includes a first metal shielding wire AB and a second metal shielding wire CD, the first metal shielding wire AB is disposed corresponding to a neutral connection wire in the load power supply line, the second metal shielding wire CD is disposed corresponding to a live connection wire in the load power supply line, one end of the first metal shielding wire AB is connected to one end of the second metal shielding wire CD, and the other end of the first metal shielding wire AB and the other end of the second metal shielding wire CD are respectively connected to the detecting unit 13, wherein when the connection between the first metal shielding wire AB and the second metal shielding wire CD is disconnected, the shielding unit 12 is opened.

Specifically, the leakage detection interrupt circuit 100 may be used as a plug, as shown in fig. 2, for example, for an electrical appliance such as an air conditioner, an electric rice cooker, a refrigerator, an induction cooker, a humidifier, or the like. As an example, the plug may include three pins connected to the live connection line, the neutral connection line, and the ground connection line, respectively, for correspondingly connecting the live L, neutral N, and ground PE of the power AC, as shown in fig. 3 (a). Because the live wire connecting wire, the neutral wire connecting wire and the ground wire connecting wire are all conductors (such as copper wires), referring to fig. 3 (a), insulating layers (which can be made of insulating materials such as rubber, plastics and the like) can be respectively wrapped on the live wire connecting wire, the neutral wire connecting wire and the ground wire connecting wire. In order to realize leakage protection, the insulating materials corresponding to the live wire connecting wire and the zero wire connecting wire are coated with metal shielding wires, namely the second metal shielding wire CD and the first metal shielding wire AB, so as to be used for leakage detection. To further ensure the safety, the second metal shielding wire CD may be further wrapped with an insulating layer (made of an insulating material such as rubber, plastic, etc.), and the three wires together with their respective insulating layers and the metal shielding wire, etc. may be encapsulated by a sheath (made of an insulating material such as rubber, plastic, etc.).

The length of the metal shielding wire can be set according to the requirement, for example, the first metal shielding wire AB is wrapped on the surface of the insulating layer of part of the zero wire connecting wire, and the second metal shielding wire CD is wrapped on the surface of the insulating layer of part of the live wire connecting wire.

When the plug is used, the detecting unit 13 may detect whether a leakage current flows through the first metal shielding wire AB or the second metal shielding wire CD, and may also detect whether the connection between the first metal shielding wire AB and the second metal shielding wire CD is disconnected, and if any of the above conditions occurs, the trigger switch driving unit 11 controls the switch unit 10 to be disconnected, so as to cut off the access of the power AC, thereby realizing protection. Therefore, when the electric leakage is detected, the access of the power supply AC can be cut off; and when the electric leakage cannot be detected in time due to disconnection between the first metal shielding wire AB and the second metal shielding wire CD, the power AC is cut off, so that the working safety and reliability of the electrical equipment can be improved.

In some embodiments, as shown in fig. 4, the switching unit 10 includes: trip coil switch RY, first diode D1, second diode D2, and first switching tube Q1.

Referring to fig. 4, the trip coil switch RY includes a first contact 1, a second contact 2, and a winding, the first contact 1 is used to connect a zero line of a power supply, the second contact 2 is connected to a zero line connection line in a load power supply line, one end 5 of the winding is connected to a live line connection line in the load power supply line, the other end 6 of the winding is connected to a cathode of a second diode D2 to form a first node, and the first node is connected to a third detection end of a detection unit 13, wherein the winding is used to trigger on-off between the first contact 1 and the second contact 2. The cathode of the first diode D1 is connected to a zero line connecting wire; an anode of the second diode D2 is connected to an anode of the first diode D1 to form a second node, and the second node is connected to the first terminal of the switch driving unit 11. The first end of the first switching tube Q1 is connected to the second node, the second end of the first switching tube Q1 is connected to the first node, and the control end of the first switching tube Q1 is connected to the second end of the switch driving unit 11.

In this embodiment, the disconnection of the power supply AC can be achieved by the winding triggering the first contact 1 to disconnect from the second contact 2. Specifically, the winding of the tripping coil switch RY is electrified to generate magnetic force, the tripping coil switch RY is attracted by the magnetic force, the first contact 1 and the second contact 2 are disconnected, and zero line connection of the power supply AC is cut off; accordingly, the winding of the tripping coil switch RY is deenergized, the tripping coil switch RY is not attracted by magnetic force, the first contact 1 and the second contact 2 are connected, and zero line access of the connecting power supply AC is realized.

As some examples, the first switching transistor Q1 may employ a triode or a thyristor. The silicon controlled rectifier is an element formed by PNPN four layers of semiconductors, and comprises three electrodes, namely: an anode, a cathode and a control electrode. The characteristics are as follows: when the anode is connected with the reverse voltage or the anode is connected with the forward voltage but the control electrode is not applied with voltage, the anode is not conducted, and when the anode and the control electrode are simultaneously connected with the forward voltage, the anode and the control electrode are turned into a conducting state. Once turned on, the control voltage loses its control, and is always on regardless of the control voltage or polarity.

Optionally, to further improve the reliability of cutting off the power AC, referring to fig. 4, the trip coil switch RY may further include a third contact 3 and a fourth contact 4, where the third contact 3 is used to connect to a live wire L of the power AC, and the fourth contact 4 is connected to one end of the live wire connecting wire, where the winding is further used to trigger on-off of the third contact 3 and the fourth contact 4.

Specifically, the winding of the tripping coil switch RY is electrified to generate magnetic force, the tripping coil switch RY is attracted by the magnetic force, and the third contact 3 and the fourth contact 4 are disconnected, so that the connection of the power supply AC live wire is cut off; correspondingly, the winding of the tripping coil switch RY is deenergized, the tripping coil switch RY is not attracted by magnetic force, and the third contact 3 is connected with the fourth contact 4, so that the connection of the power supply AC live wire L is realized.

Therefore, the winding triggers the first contact 1 to be disconnected from the second contact 2, and simultaneously triggers the third contact 3 and the fourth contact 4, so that the reliability of cutting off the power supply AC access can be improved.

In some embodiments, as shown in fig. 5, the switching unit 10 further includes: a second varistor ZR2; the second diode D2 is connected in parallel with the second varistor ZR 2.

Specifically, the piezoresistor is a resistance device with nonlinear volt-ampere characteristic, and is mainly used for voltage clamping when the circuit is subjected to overvoltage, and absorbing redundant current to protect sensitive devices. The second varistor ZR2 may be short-circuited when the voltage across it changes sharply, so as to blow a current fuse (not shown in the figure) for protection.

In some embodiments, as shown in fig. 5, the leakage detection interrupt circuit 100 may further include: the indication unit 15 includes a first resistor R1, a second resistor R2, and a light emitting diode LED1, where the first resistor R1, the second resistor R2, and the light emitting diode LED1 are connected in series between the first node and an anode of the first diode D1, and the anode of the light emitting diode LED1 is closer to the first node than the cathode of the light emitting diode LED 1.

The series connection manner of the first resistor R1, the second resistor R2, and the light emitting diode LED1 shown in fig. 5 is merely an example, and the second resistor R2, the first resistor R1, and the light emitting diode LED1 may be sequentially connected in series, the second resistor R2, the light emitting diode LED1, and the first resistor R1 may be sequentially connected in series, the first resistor R1, the light emitting diode LED1, and the second resistor R2 may be sequentially connected in series, the light emitting diode LED1, the second resistor R2, and the first resistor R1 may be sequentially connected in series, and the like.

Specifically, when a current flows through the light emitting diode LED1, the light emitting diode LED1 may be lighted. Thus, whether the light emitting diode LED1 emits light or not can determine the current direction or the current state of the leakage detection interrupt circuit 100. The light emitting color of the light emitting diode LED1 can be calibrated according to the requirement, for example, red, green, etc.

In some embodiments, as shown in fig. 4 and 5, the switch driving unit 11 includes: a first capacitor C1, a third resistor R3 and a fourth resistor R4.

Referring to fig. 4 and 5, one end of the first capacitor C1 is used as a first end of the switch driving unit 11, and the other end of the first capacitor C1 is used as a second end of the switch driving unit 11; the fourth resistor R4 is connected with the first capacitor C1 in parallel; one end of the third resistor R3 is connected to the other end of the first capacitor C1, and the other end of the third resistor R3 serves as a third end of the switch driving unit 11.

Specifically, the first capacitor C1 may play a role in stabilizing the voltage between the control electrode and the cathode of the first switching tube Q1, the third resistor R3 and the fourth resistor R4 may play a role in voltage division, and specific resistance values may be set as required.

In some embodiments, as shown in fig. 4 and 5, the leakage detection interrupt circuit 100 further includes: a test unit 14.

Referring to fig. 4 and 5, the TEST unit 14 includes a TEST switch TEST connected to the detection unit 13. The detecting unit 13 is further configured to trigger the switch driving unit 11 to control the switch unit 10 to be turned off to cut off the power AC when the TEST switch TEST is detected to be pressed.

The TEST switch TEST may be disposed on the plug, and the disposed position is shown in fig. 2, so as to facilitate pressing. Specifically, when the plug is used, the TEST switch TEST can be pressed, and the trigger switch driving unit 11 controls the switch unit 10 to be disconnected, so that the power supply AC is cut off, electric leakage can be prevented, and the user is ensured not to generate electric shock danger.

In some embodiments, as shown in fig. 4 and 5, the test unit 14 further includes: and a fifth resistor R5.

Referring to fig. 4 and 5, one end of the fifth resistor R5 is connected to the zero line connection line in the load power supply line, and the other end of the fifth resistor R5 is connected to one end of the TEST switch TEST and the fourth detection end of the detection unit 13, respectively.

The other end of the TEST switch TEST is connected to the other end of the third resistor R3, the detecting unit 13, and the other end of the second metal shielding line CD, respectively.

The fifth resistor R5 can perform a TEST when the TEST switch TEST is pressed down, or can perform a voltage division function when the path formed by the first metal shielding line AB and the second metal shielding line CD is open, and the resistance value thereof can be set as required.

In some embodiments, as shown in fig. 5, the leakage detection interrupt circuit 100 further includes: the lightning protection unit 16 comprises a first varistor ZR1, one end of the first varistor ZR1 is connected to the neutral connection line in the load supply line, and the other end of the first varistor ZR1 is connected to the live connection line in the load supply line.

The first piezoresistor ZR1 can be rapidly reduced to be close to 0 ohm when the voltage of the power grid at two ends of the first piezoresistor ZR is rapidly changed, and the voltage of the power grid 220V is shorted, so that a corresponding fuse (not shown in the figure) is blown, and a safety function is achieved.

It should be noted that, the lightning protection of the first piezoresistor ZR1 needs to be noted:

(1) the working environment temperature of the first piezoresistor ZR1 is within the range specified by technical conditions;

(2) the first piezoresistor ZR1 should not be installed close to heating or flammable components and has a spacing of more than 3 mm so as not to damage the components;

(3) The peak surge current through the first varistor ZR1 should not exceed the "peak current" listed in the lightning protection varistor technical parameter table.

Based on the shielding unit 12 structure shown in fig. 4, 5 and 3 (a), in some embodiments, as shown in fig. 4, 5, the detection unit 13 includes: the third diode D3, the fourth diode D4, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the second switching tube Q2, and the second capacitor C2.

Referring to fig. 4 and 5, the anode of the third diode D3 is used as the third detection end of the detection unit 13, and the cathode of the third diode D3 is connected to one end of the sixth resistor R6; the first end of the second switching tube Q2 is respectively connected with the other end of the sixth resistor R6 and one end of the seventh resistor R7, the second end of the second switching tube Q2 is connected with one end of the tenth resistor R10 to form a fourth node, and the control end of the second switching tube Q2 is connected with one end of the ninth resistor R9; the other end of the seventh resistor R7 is connected with the other end of the ninth resistor R9 to form a fifth node; one end of an eighth resistor R8 is connected with the fourth node, the other end of the eighth resistor R8 is connected with the fifth node, and the eighth resistor R8 is connected with the second capacitor C2 in parallel; the anode of the fourth diode D4 is connected to the other end of the tenth resistor R10, and the cathode of the fourth diode D4 is connected to one end of the TEST switch TEST and the other end of the fifth resistor R5, respectively.

In one embodiment, referring to fig. 5, the fourth node is connected to the other end of the TEST switch TEST, the switch driving unit 11, and the other end of the second metal shielding line CD, respectively, and the fifth node is connected to the other end of the first metal shielding line AB. In another embodiment, referring to fig. 6, the fourth node is connected to the other end of the first metal shielding line AB, and the fifth node is connected to the other end of the TEST switch TEST, the other end of the third resistor R3, and the other end of the second metal shielding line CD, respectively.

In the embodiment shown in fig. 5 and 6, the positions between the third diode D3 and the sixth resistor R6 are interchangeable, and the positions between the fourth diode D4 and the tenth resistor R10 are interchangeable. The resistance values of the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, and the tenth resistor R10 can be set as necessary.

The second switching tube Q2 is similar to the first switching tube Q1, and a triode or a thyristor may be used. The silicon controlled rectifier is an element formed by PNPN four layers of semiconductors, and comprises three electrodes, namely: an anode, a cathode and a control electrode. The characteristics are as follows: when the anode is connected with the reverse voltage or the anode is connected with the forward voltage but the control electrode is not applied with voltage, the anode is not conducted, and when the anode and the control electrode are simultaneously connected with the forward voltage, the anode and the control electrode are turned into a conducting state. Once turned on, the control voltage loses its control, and is always on regardless of the control voltage or polarity.

In some embodiments, the structure of the detecting unit 13 may also be as shown in fig. 7, which differs from the detecting unit 13 of the embodiment shown in fig. 5 and 6 in that: in comparison with the detection unit 13 of the embodiment shown in fig. 5 and 6, the detection unit 13 of the embodiment shown in fig. 7 may not include the sixth resistor R6 and the third diode D3. Therefore, compared with the embodiments shown in fig. 5 and 6, the use of components and parts can be reduced, and the cost is reduced.

In some examples, as shown in fig. 9, the detection unit 13 includes: a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a second switching tube Q2, and a second capacitor C2.

Referring to fig. 9, a first end of the second switching tube Q2 is used as a third detection end of the detection unit 13, and a second end of the second switching tube Q2 is connected with a third end of the switch driving unit 11; the second end of the second switching tube Q2 is connected with one end of a tenth resistor R10 to form a fourth node, and the other end of the tenth resistor R10 is connected with the first end of the switch driving unit 11; one end of a seventh resistor R7 is connected with the first end of the second switching tube Q2, the other end of the seventh resistor R7 is connected with the other end of a ninth resistor R9 to form a fifth node, and one end of the ninth resistor R9 is connected with the control end of the second switching tube Q2; the eighth resistor R8 is connected between the fourth node and the fifth node, and the TEST switch TEST is connected in parallel with the seventh resistor R7.

In this embodiment, the fourth node is connected to the other end of the first metal shield AB, and the fifth node is connected to the other end of the second metal shield CD.

In some embodiments, as shown in fig. 8, the detection unit 13 further includes: the anode of the third diode D3 is used as a third detection end of the detection unit 13, the cathode of the third diode D3 is connected with one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected with the first end of the second switching tube Q2.

In some embodiments, referring to fig. 8, the detection unit 13 further includes: and a fourth diode D4, an anode of the fourth diode D4 is connected to the other end of the tenth resistor R10, and a cathode of the fourth diode D4 is connected to the first end of the switch driving unit 11.

Referring to fig. 8 and 9, the structure of the detecting unit 13 in fig. 9 is different from the detecting unit 13 of the embodiment shown in fig. 8 in that: in comparison with the detection unit 13 of the embodiment shown in fig. 8, the detection unit 13 of the embodiment shown in fig. 9 may not include the sixth resistor R6, the third diode D3, and the fourth diode D4. Therefore, compared with the embodiment shown in fig. 8, the embodiment shown in fig. 9 can reduce the use of components and reduce the cost.

In some embodiments, as shown in fig. 10, the detection unit 13 includes a first detection end and a second detection end, and the shielding unit 12 includes a metal shielding layer EF, as shown in fig. 10 and fig. 3 (b), which is used to wrap the live wire connection line and the neutral wire connection line in the load power supply line, and is connected to the first detection end and the second detection end, respectively, where when the connection between the first detection end and the second detection end is broken, the shielding unit 12 is opened.

In some embodiments, referring to fig. 10, one of the first and second sensing terminals is connected to the metallic shielding EF by a wire GH.

In some embodiments, as shown in fig. 3 (c) and fig. 3 (d), the metal shielding layer EF may also be used to wrap the wire GH.

In some embodiments, as shown in fig. 3 (c) and fig. 3 (e), the metallic shielding layer EF may also be used to wrap the ground connection line PE in the load power supply line.

Specifically, referring to fig. 3 (c), 3 (d) and 3 (e), the shielding unit 12 includes a metal shielding layer EF and a wire GH. Referring to fig. 3 (c), the metal shielding layer EF wraps the insulating layer surfaces of the lead GH, the live wire connection wire, the neutral wire connection wire and the ground wire connection wire; referring to fig. 3 (d), the metal shielding layer EF wraps the surface of the insulating layer of the lead GH, the live wire connecting wire and the neutral wire connecting wire, and is in the same outer insulating layer as the ground wire connecting wire wrapping the insulating layer; referring to fig. 3 (e), the metal shield EF wraps the insulating layer surfaces of the ignition wire connecting wire, the neutral wire connecting wire, and the ground wire connecting wire, and is in the same outer insulating layer as the wire GH wrapping the insulating layer.

Note that, the shielding unit 12 of the structures shown in fig. 3 (c), 3 (d) and 3 (E) is similar to the shielding unit 12 of the structure shown in fig. 3 (b), the E terminal is close to the input terminal, the F terminal is close to the output terminal, the G terminal is close to the input terminal, the H terminal is close to the output terminal, and the F terminal of the metal shielding layer EF and the H terminal of the wire GH are connected to form a path, as shown in fig. 6.

Based on the shielding unit 12 shown in fig. 10 and 3 (b) -3 (e), in some embodiments, as shown in fig. 13, the detection unit 13 includes: a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a second switching tube Q2, and a second capacitor C2.

Referring to fig. 13, a first end of the second switching tube Q2 is connected to one end of the seventh resistor R7 to form a third node, and the third node is used as a third detection end of the detection unit 13; the second end of the second switching tube Q2 is connected with one end of a tenth resistor R10 to form a fourth node, the other end of the tenth resistor R10 is connected to a zero line connecting line, and the fourth node is used as a first detection end of the detection unit 13; one end of a ninth resistor R9 is connected with the control end of the second switching tube Q2, the other end of the ninth resistor R9 is connected with the other end of the seventh resistor R7 to form a fifth node, and the fifth node is used as a second detection end of the detection unit 13; the eighth resistor R8 is connected between the fourth node and the fifth node, and the second capacitor C2 is connected in parallel with the eighth resistor R8.

In some embodiments, as shown in fig. 12, the detection unit 13 further includes: and a third diode D3 and a sixth resistor R6, wherein the anode of the third diode D3 is used as a third detection end of the detection unit 13, the cathode of the third diode D3 is connected with one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected with a third node.

In some embodiments, as shown in fig. 12, the detection unit 13 further includes: and a fourth diode D4, wherein an anode of the fourth diode D4 is connected to the other end of the tenth resistor R10, and a cathode of the fourth diode D4 is connected to the zero line connection line.

In some embodiments, as shown in fig. 12 and 13, the leakage detection interrupt circuit 100 further includes: a test unit 14.

Referring to fig. 12 and 13, the TEST unit 14 includes a TEST switch TEST connected in parallel with the seventh resistor R7, and the fourth node is further connected to the third terminal of the switch driving unit 11.

In this embodiment, the detecting unit 13 is further configured to trigger the switch driving unit 11 to control the switch unit 10 to be turned off to cut off the power AC when the TEST switch TEST is detected to be pressed.

In some embodiments, as shown in fig. 10 and 11, the leakage detection interrupt circuit 100 further includes: a test unit 14.

Referring to fig. 10 and 11, the TEST unit 14 includes a TEST switch TEST and a fifth resistor R5, one end of the fifth resistor R5 is connected to the zero line connection line, the other end of the fifth resistor R5 is connected to one end of the TEST switch TEST and a fourth detection end of the detection unit 13, and the other end of the TEST switch TEST is connected to a third end and a fourth node of the switch driving unit 11;

Note that the structures of fig. 10, 14, 15, and 16 are the same, except that: in fig. 10, a first switching tube Q1 adopts a silicon controlled rectifier, and a second switching tube Q2 adopts a silicon controlled rectifier; in fig. 14, a first switching tube Q1 adopts a silicon controlled rectifier, and a second switching tube Q2 adopts a triode; in fig. 15, a triode is adopted as the first switching tube Q1, and a silicon controlled rectifier is adopted as the second switching tube Q2; the first switching transistor Q1 in fig. 16 is a triode, and the second switching transistor Q2 is a triode.

The structures of fig. 11, 17, 18, and 19 are the same, except that: in fig. 11, a first switching tube Q1 adopts a silicon controlled rectifier, and a second switching tube Q2 adopts a silicon controlled rectifier; in fig. 17, a first switching tube Q1 adopts a silicon controlled rectifier, and a second switching tube Q2 adopts a triode; in fig. 18, a triode is adopted as the first switching tube Q1, and a silicon controlled rectifier is adopted as the second switching tube Q2; the first switching transistor Q1 in fig. 19 is a triode, and the second switching transistor Q2 is a triode.

The structures of fig. 12, 20, 21, and 22 are the same, except that: in fig. 12, a first switching tube Q1 adopts a silicon controlled rectifier, and a second switching tube Q2 adopts a silicon controlled rectifier; in fig. 20, a first switching tube Q1 adopts a silicon controlled rectifier, and a second switching tube Q2 adopts a triode; in fig. 21, a triode is adopted as the first switching tube Q1, and a silicon controlled rectifier is adopted as the second switching tube Q2; the first switching transistor Q1 in fig. 22 is a triode, and the second switching transistor Q2 is a triode.

The structures of fig. 13, 23, 24 and 25 are the same, except that: in fig. 12, a first switching tube Q1 adopts a silicon controlled rectifier, and a second switching tube Q2 adopts a silicon controlled rectifier; in fig. 23, a first switching tube Q1 adopts a silicon controlled rectifier, and a second switching tube Q2 adopts a triode; in fig. 24, a triode is adopted as the first switching tube Q1, and a silicon controlled rectifier is adopted as the second switching tube Q2; the first switching transistor Q1 in fig. 25 is a triode, and the second switching transistor Q2 is a triode.

The following describes the operation principle of the leakage detection interrupt circuit 100 according to the embodiment of the present utility model, taking the example that the shielding unit 12 includes the first metal shielding line AB and the second metal shielding line CD, with reference to fig. 5, 6, and 8, respectively:

referring to fig. 5, when the detection unit 13 detects that the live wire L has a leakage current to the second metal shielding wire CD, the live wire L, the second metal shielding wire CD, the third resistor R3, the fourth resistor R4, the first diode D1 and the zero line N form a current loop, the control end voltage of the first switching tube Q1 rises to trigger on, the live wire L, the winding of the trip coil switch RY, the first switching tube Q1 and the first diode D1 form a strong current loop, the winding of the trip coil switch RY generates magnetic force, the trip coil switch RY is attracted by the magnetic force, the first contact 1 and the second contact 2 are disconnected, the third contact 3 and the fourth contact 4 are disconnected, and the cut-off of the power supply AC is realized.

When the detection unit 13 detects that the zero line N has leakage current to the first metal shielding wire AB, the zero line N, the first metal shielding wire AB, the third resistor R3, the fourth resistor R4, the second diode D2, windings of the tripping coil switch RY and the live wire L form a current loop, the voltage of the control end of the first switching tube Q1 rises to trigger on, the windings of the live wire L and the tripping coil switch RY, the first switching tube Q1 and the first diode D1 form a strong current loop, the windings of the tripping coil switch RY generate magnetic force, the tripping coil switch RY is attracted by the magnetic force, the first contact 1 and the second contact 2 are disconnected, the third contact 3 and the fourth contact 4 are disconnected, and the cut-off of the power supply AC is realized.

When the detection unit 13 detects that the path formed by the first metal shielding wire AB and the second metal shielding wire CD is an open path, that is, the connection wire between the first metal shielding wire AB and the second metal shielding wire CD is disconnected (the disconnection may be caused by breakage of the first metal shielding wire AB or the second metal shielding wire CD), the live wire L, the winding of the trip coil switch RY, the third diode D3, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the tenth resistor R10, the fourth diode D4, the fifth resistor R5 and the zero wire N form a current loop, the light emitting diode LED1 emits light, the control end voltage of the second switching tube Q2 rises to trigger on, the seventh resistor R7 and the eighth resistor R8 are shorted, the winding of the trip coil switch RY, the third diode D3, the sixth resistor R6, the second switching tube Q2, the third resistor R3, the fourth resistor R4, the first diode D1 and the zero wire N form a current loop, the light emitting diode LED1 continues to emit light, the control end of the first switching tube Q1 triggers the voltage, the trip coil L, the first winding of the trip coil Q1 and the first switching tube Q2 is turned off, the first magnetic force winding is turned on, the first winding of the first switching tube Q1 is turned off, the first winding of the magnetic wire Q1 is turned off, and the first winding is turned on, and the winding is turned off. At this time, if a leakage current flows, the power AC is cut off, and thus the protection function is achieved even if the leakage detection cannot be achieved by the leakage metal shield wire.

In this process, since the light emission of the light emitting diode LED1 varies, whether the path formed by the first metal shielding line AB and the second metal shielding line CD is open or not and whether the cut-off of the power AC is controlled after the open or not can be determined according to the light emission condition of the light emitting diode LED 1.

When the detection unit 13 detects that the TEST switch TEST is pressed down, the zero line N, the fifth resistor R5, the TEST switch TEST, the third resistor R3, the fourth resistor R4, the second diode D2, the winding of the trip coil switch RY, and the live wire L form a current loop, the control end voltage of the first switching tube Q1 rises to trigger conduction, the winding of the live wire L, the trip coil switch RY, the first switching tube Q1, the first diode D1, and the zero line N form a strong current loop, the winding of the trip coil switch RY generates magnetic force, the trip coil switch RY is attracted by the magnetic force, the first contact 1 and the second contact 2 are disconnected, the third contact 3 and the fourth contact 4 are disconnected, and the cut-off of the power supply AC is realized.

Referring to fig. 6, when the detection unit 13 detects that the live wire L has a leakage current to the second metal shielding wire CD, the live wire L, the second metal shielding wire CD, the third resistor R3, the fourth resistor R4, the first diode D1 and the zero line N form a current loop, the control end voltage of the first switching tube Q1 rises to trigger on, the live wire L, the winding of the trip coil switch RY, the first switching tube Q1 and the first diode D1 form a strong current loop, the winding of the trip coil switch RY generates magnetic force, the trip coil switch RY is attracted by the magnetic force, the first contact 1 and the second contact 2 are disconnected, the third contact 3 and the fourth contact 4 are disconnected, and the cut-off of the power supply AC is realized.

The operation principle of the leakage detection interrupt circuit 100 of the embodiment shown in fig. 7 is similar to that of the leakage detection interrupt circuit 100 of the embodiment shown in fig. 6, except that when the path formed by the first metal shielding line AB and the second metal shielding line CD is an open circuit, the current loop formed does not include the third diode D3 and the sixth resistor R6.

Referring to fig. 8, when the detection unit 13 detects that the live wire L has a leakage current to the second metal shielding wire CD, the live wire L, the second metal shielding wire CD, the first metal shielding wire AB, the third resistor R3, the fourth resistor R4, the first diode D1, and the zero line N form a current loop, the voltage of the control end of the first switching tube Q1 rises to trigger on, the winding of the live wire L, the trip coil switch RY, the first switching tube Q1, and the first diode D1 form a strong current loop, the winding of the trip coil switch RY generates a magnetic force, the trip coil switch RY is attracted by the magnetic force, the first contact 1 and the second contact 2 are opened, the third contact 3 and the fourth contact 4 are opened, and the cut-off of the power AC is realized.

When the detection unit 13 detects that the path formed by the first metal shielding wire AB and the second metal shielding wire CD is an open path, that is, the connection wire between the first metal shielding wire AB and the second metal shielding wire CD is disconnected (the disconnection may be caused by breakage of the first metal shielding wire AB or the second metal shielding wire CD), the live wire L, the winding of the trip coil switch RY, the third diode D3, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the tenth resistor R10, the fourth diode D4, the first diode D1 and the zero wire N form a current loop, the light emitting diode LED1 emits light, the control end voltage of the second switching tube Q2 rises to trigger on, the short-circuit seventh resistor R7 and the eighth resistor R8 are connected, the winding of the trip coil switch RY, the third diode D3, the sixth resistor R6, the second switching tube Q2, the third resistor R3, the fourth resistor R4, the first diode D1 and the zero wire N form a current loop, the light emitting diode LED1 continuously emits light, the control end of the first switching tube Q1 triggers the voltage, the trip coil L, the first tripping coil Q1 and the third winding is disconnected, the first magnetic force switch Q1 is disconnected, the first magnetic force winding is disconnected, the first tripping coil Q1 and the first winding and the second magnetic contact is disconnected, the first winding and the second winding is disconnected, the first winding is disconnected, and the winding is disconnected. At this time, if a leakage current flows, the power AC is cut off, and thus the protection function is achieved even if the leakage detection cannot be achieved by the leakage metal shield wire.

When the detection unit 13 detects that the TEST switch TEST is pressed down, a current loop is formed by the live wire L, the winding of the trip coil switch RY, the third diode D3, the sixth resistor R6, the TEST switch TEST, the eighth resistor R8, the third resistor R3, the fourth resistor R4, the first diode D1 and the zero line N, the control end voltage of the first switching tube Q1 rises to trigger conduction, a strong current loop is formed by the live wire L, the winding of the trip coil switch RY, the first switching tube Q1, the first diode D1 and the zero line N, the magnetic force is generated by the winding of the trip coil switch RY, the trip coil switch RY is attracted by the magnetic force, the first contact 1 and the second contact 2 are disconnected, the third contact 3 and the fourth contact 4 are disconnected, and the cut-off of the power supply AC is realized.

The operation principle of the leakage detection interrupt circuit 100 of the embodiment shown in fig. 9 is similar to that of the leakage detection interrupt circuit 100 of the embodiment shown in fig. 8, except that when the path formed by the first metal shielding line AB and the second metal shielding line CD is an open circuit, the third diode D3, the sixth resistor R6, and the fourth diode D4 are not included in the formed current loop.

The following describes the operation principle of the leakage detection interrupt circuit 100 according to the embodiment of the present utility model with reference to fig. 10, by taking the example that the shielding unit 12 includes the metal shielding layer EF:

referring to fig. 10, when the detection unit 13 detects that the live wire L has a leakage current to the metal shielding layer EF, the live wire L, the metal shielding layer EF, the third resistor R3, the fourth resistor R4, the first diode D1 and the zero line N form a current loop, the control end voltage of the first switching tube Q1 rises to trigger on, the live wire L, the winding of the trip coil switch RY, the first switching tube Q1 and the first diode D1 form a strong current loop, the winding of the trip coil switch RY generates magnetic force, the trip coil switch RY is attracted by the magnetic force, the first contact 1 and the second contact 2 are disconnected, the third contact 3 and the fourth contact 4 are disconnected, and the power AC is cut off.

When the detection unit 13 detects that the zero line N has leakage current to the metal shielding layer EF, the zero line N, the metal shielding layer EF, the third resistor R3, the fourth resistor R4, the second diode D2, the winding of the tripping coil switch RY and the live wire L form a current loop, the control end voltage of the first switching tube Q1 rises to trigger on, the live wire L, the winding of the tripping coil switch RY, the first switching tube Q1 and the first diode D1 form a strong current loop, the winding of the tripping coil switch RY generates magnetic force, the tripping coil switch RY is attracted by the magnetic force, the first contact 1 and the second contact 2 are disconnected, the third contact 3 and the fourth contact 4 are disconnected, and the cut-off of the power supply AC is realized.

When the detection unit 13 detects that the metal shielding layer EF is open, that is, the connecting line between the E-F-G-H is disconnected (the disconnection may be caused by breakage of the metal shielding layer EF), the winding of the live wire L, the trip coil switch RY, the third diode D3, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the tenth resistor R10, the fourth diode D4, the fifth resistor R5, and the zero line N form a current loop, the light emitting diode LED1 emits light, the control terminal voltage of the second switching tube Q2 rises to trigger on, the seventh resistor R7 and the eighth resistor R8 are shorted, the winding of the trip coil switch RY, the third diode D3, the sixth resistor R6, the second switching tube Q2, the third resistor R3, the fourth resistor R4, the first diode D1, and the zero line N form a current loop, the light emitting diode LED1 continues to emit light, the control terminal voltage rise of the first switching tube Q1 triggers on, the winding of the trip coil Q1, the first switching tube D1, the first switching tube N forms the zero line winding, the first magnetic force switch winding is turned off, the first magnetic force is turned on, the first switching tube Q1 is turned off, the first magnetic force switch winding is turned off, and the fourth magnetic force contact is turned off, the winding is turned off, and the first magnetic contact is turned off, and the winding 1 is turned off. At this time, if a leakage current flows, the power AC is cut off, and thus the protection function is achieved even if the leakage detection cannot be achieved by the leakage metal shield wire.

In this process, since the light emission of the light emitting diode LED1 is changed, whether the metal shielding layer EF is open or not and whether the cut-off of the power AC is controlled after the open or not can be determined according to the light emission condition of the light emitting diode LED 1.

The operation principle of the leakage detection interrupt circuit 100 of the embodiment shown in fig. 11 is similar to that of the leakage detection interrupt circuit 100 of the embodiment shown in fig. 10, except that the third diode D3 and the sixth resistor R6 are not included in the current loop formed when the metal shielding layer EF is open.

Referring to fig. 12, when the detection unit 13 detects that the live wire L has a leakage current to the metal shielding layer EF, the live wire L, the metal shielding layer EF, the third resistor R3, the fourth resistor R4, the first diode D1 and the zero line N form a current loop, the control end voltage of the first switching tube Q1 rises to trigger on, the live wire L, the winding of the trip coil switch RY, the first switching tube Q1 and the first diode D1 form a strong current loop, the winding of the trip coil switch RY generates magnetic force, the trip coil switch RY is attracted by the magnetic force, the first contact 1 and the second contact 2 are disconnected, the third contact 3 and the fourth contact 4 are disconnected, and the power AC is cut off.

When the detection unit 13 detects that the metal shielding layer EF is open, that is, the connecting line between the E-F-G-H is disconnected (the disconnection may be caused by breakage of the metal shielding layer EF), the winding of the live wire L, the trip coil switch RY, the third diode D3, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the tenth resistor R10, the fourth diode D4, the first diode D1 and the zero line N form a current loop, the light emitting diode LED1 emits light, the control terminal voltage of the second switching tube Q2 rises to trigger on, the winding of the trip coil switch RY, the third diode D3, the sixth resistor R6, the second switching tube Q2, the third resistor R3, the fourth resistor R4 and the zero line N form a current loop, the light emitting diode LED1 continues to emit light, the control terminal voltage rise of the first switching tube Q1 triggers on, the winding of the trip coil switch Q1, the first switching tube Q1, the first line N and the third switching tube Q1 is disconnected, the first switching tube Q1 and the third switching tube RY is disconnected, the magnetic force is disconnected, and the first switching tube Q1 is disconnected, the magnetic force is disconnected, and the first switching tube Q1 is disconnected, and the magnetic contact is disconnected. At this time, if a leakage current flows, the power AC is cut off, and thus the protection function is achieved even if the leakage detection cannot be achieved by the leakage metal shield wire.

The operation principle of the leakage detection interrupt circuit 100 of the embodiment shown in fig. 13 is similar to that of the leakage detection interrupt circuit 100 of the embodiment shown in fig. 12, except that the third diode D3, the sixth resistor R6, and the fourth diode D4 are not included in the formed current loop when the metal shielding layer EF is opened.

In summary, the leakage detection interrupt circuit of the embodiment of the utility model not only can control the switch unit to be disconnected through the switch driving unit to cut off the access of the power supply when detecting that the leakage current exists in the live wire L or the zero wire N to the shielding unit or the test switch is pressed down, but also can realize leakage protection and ensure the safety of plug insertion into the power supply; when the shielding unit is opened, the switch driving unit is used for controlling the switch unit to be opened to cut off the power supply, so that the problem that the danger occurs because the leakage current cannot be timely detected due to the fact that the metal shielding wire is damaged and opened is solved, and the protection and safety functions can be better achieved.

Fig. 26 is a block diagram of the structure of the leakage detection interrupter according to the embodiment of the utility model.

As shown in fig. 26, the leak detection interrupter 300 includes the leak detection interrupt circuit 100 described above. The leakage detection interrupter 300 may be a three-phase plug as shown in fig. 2, or a two-phase plug. Can be applied according to actual needs.

According to the leakage detection interrupt device disclosed by the embodiment of the utility model, through the leakage detection interrupt circuit, when the leakage current of the live wire L or the null wire N is detected to reach the shielding unit or the test switch is pressed down, the switch driving unit controls the switch unit to be disconnected, so that the power supply is cut off, the leakage protection is realized, and the safety of plug insertion into the power supply is ensured; when the shielding unit is opened, the switch driving unit is used for controlling the switch unit to be opened to cut off the power supply, so that the problem that the danger occurs because the leakage current cannot be timely detected due to the fact that the metal shielding wire is damaged and opened is solved, and the protection and safety functions can be better achieved.

As shown in fig. 27, the electrical apparatus 400 includes the leakage detection interrupt circuit 100 of the above-described embodiment.

In this embodiment, the electric device 400 may include an air conditioner, an electric rice cooker, a refrigerator, an induction cooker, a humidifier, and the like.

According to the electrical equipment provided by the embodiment of the utility model, through the leakage detection interrupt circuit, when the leakage current of the live wire L or the null wire N is detected to reach the shielding unit or the test switch is pressed down, the switch driving unit controls the switch unit to be disconnected, so that the power supply is cut off, the leakage protection is realized, and the safety of plug insertion into the power supply is ensured; when the shielding unit is opened, the switch driving unit is used for controlling the switch unit to be opened to cut off the power supply, so that the problem that the danger occurs because the leakage current cannot be timely detected due to the fact that the metal shielding wire is damaged and opened is solved, and the protection and safety functions can be better achieved.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims

1. A leakage detection interrupt circuit, the circuit being adapted to be connected between a power supply input and a load, the circuit comprising:

a switch unit configured to control whether a power supply of the power supply input terminal is connected;

a switch driving unit configured to control on-off of the switch unit;

the shielding unit is suitable for being wrapped on a load power supply line so as to perform electric leakage detection on the load power supply line;

the detection unit is connected with the switch driving unit, comprises a first detection end and a second detection end, is connected with the shielding unit through the first detection end and the second detection end, and is configured to trigger the switch driving unit to control the switch unit to be disconnected when the shielding unit is detected to be open so as to cut off the access of the power supply.

2. The leakage detection interrupt circuit of claim 1, wherein the shielded cell includes a first metallic shielded wire and a second metallic shielded wire, the first metallic shielded wire being disposed corresponding to a neutral connection line in the load power supply line, the second metallic shielded wire being disposed corresponding to a live connection line in the load power supply line, one end of the first metallic shielded wire being connected to one end of the second metallic shielded wire, the other end of the first metallic shielded wire and the other end of the second metallic shielded wire being correspondingly connected to the first detection end and the second detection end, respectively, wherein the shielded cell opens when the connection between the first metallic shielded wire and the second metallic shielded wire is broken.

3. The electrical leakage detection interrupt circuit of claim 2, wherein the first metallic shield wire is wrapped around a portion of the surface of the insulating layer of the neutral connection wire and the second metallic shield wire is wrapped around a portion of the surface of the insulating layer of the live connection wire.

4. The electrical leakage detection interrupt circuit of claim 1, wherein the shield unit comprises a metallic shield layer adapted to encase the live and neutral connection wires in the load supply line and to be connected to the first and second detection terminals, respectively, wherein an open circuit of the shield unit occurs upon disconnection between the first and second detection terminals.

5. The electrical leakage detection interrupt circuit of claim 4, wherein one of the first and second detection terminals is connected to the metallic shield layer by a wire.

6. The electrical leakage detection interrupt circuit of claim 5, wherein the metallic shield layer is further configured to encapsulate the wire.

7. The electrical leakage detection interrupt circuit of any one of claims 4-6, wherein the metallic shield layer is further adapted to wrap a ground connection wire in the load supply line.

8. The leakage detection interrupt circuit of claim 1, wherein the detection unit is further configured to trigger the switch driving unit to control the switch unit to be turned off to cut off the power supply when a leakage current flowing through the shielding unit is detected.

9. The leakage detection interrupt circuit of claim 1, wherein the switching unit includes: the tripping coil switch, the first diode, the second diode and the first switching tube;

the trip coil switch comprises a first contact, a second contact and a winding, wherein the first contact is used for being connected with a zero line of the power supply, the second contact is connected with a zero line connecting wire in the load power supply line, one end of the winding is connected with a live wire connecting wire in the load power supply line, the other end of the winding is connected with a cathode of the second diode to form a first node, the first node is connected with a third detection end of the detection unit, and the winding is configured to trigger on-off between the first contact and the second contact;

The cathode of the first diode is connected to the zero line connecting wire;

the anode of the second diode is connected with the anode of the first diode to form a second node, and the second node is connected with the first end of the switch driving unit;

the first end of the first switching tube is connected with the second node, the second end of the first switching tube is connected with the first node, and the control end of the first switching tube is connected with the second end of the switch driving unit.

10. The leakage detection interrupt circuit of claim 9, further comprising:

the indicating unit comprises a first resistor, a second resistor and a light emitting diode, wherein the first resistor, the second resistor and the light emitting diode are connected in series between the first node and the anode of the first diode, and the anode of the light emitting diode is closer to the first node than the cathode of the light emitting diode.

11. The leakage detection interrupt circuit of claim 9, wherein the switch drive unit comprises: a first capacitor, a third resistor and a fourth resistor;

one end of the first capacitor is used as a first end of the switch driving unit, and the other end of the first capacitor is used as a second end of the switch driving unit;

The fourth resistor is connected with the first capacitor in parallel;

one end of the third resistor is connected with the other end of the first capacitor, and the other end of the third resistor is used as a third end of the switch driving unit.

12. The leakage detection interrupt circuit of claim 1, further comprising:

the lightning protection unit comprises a first piezoresistor, one end of the first piezoresistor is connected to a zero line connecting wire in the load power supply line, and the other end of the first piezoresistor is connected to a live wire connecting wire in the load power supply line.

13. The leakage detection interrupt circuit of claim 9, wherein the switching unit further comprises: and the second piezoresistor is connected with the second diode in parallel.

14. The leakage detection interrupt circuit of claim 2, further comprising:

the test unit comprises a test switch, and the test switch is connected with the detection unit;

the detection unit is further configured to trigger the switch driving unit to control the switch unit to be disconnected when the detection unit detects that the test switch is pressed down, so that the power supply is disconnected.

15. The leakage detection interrupt circuit of claim 14, wherein the test unit further comprises: and one end of the fifth resistor is connected to a zero line connecting wire in the load power supply line, and the other end of the fifth resistor is respectively connected with the test switch and a fourth detection end of the detection unit.

16. The leakage detection interrupt circuit of claim 15, wherein the detection unit includes:

a third diode, a fourth diode, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second switching tube and a second capacitor,

the anode of the third diode is used as a third detection end of the detection unit, and the cathode of the third diode is connected with one end of the sixth resistor; the first end of the second switching tube is connected with the other end of the sixth resistor and one end of the seventh resistor respectively, the second end of the second switching tube is connected with one end of the tenth resistor to form a fourth node, and the control end of the second switching tube is connected with one end of the ninth resistor; the other end of the seventh resistor is connected with the other end of the ninth resistor to form a fifth node; one end of the eighth resistor is connected with the fourth node, and the other end of the eighth resistor is connected with the fifth node; the eighth resistor is connected with the second capacitor in parallel; the anode of the fourth diode is connected with the other end of the tenth resistor, and the cathode of the fourth diode is respectively connected with one end of the test switch and the other end of the fifth resistor;

The fourth node is respectively connected with the other end of the test switch, the switch driving unit and the other end of the second metal shielding wire, and the fifth node is connected with the other end of the first metal shielding wire.

17. The leakage detection interrupt circuit of claim 14, wherein the detection unit includes:

a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second switch tube and a second capacitor,

the first end of the second switching tube is used as a third detection end of the detection unit, and the second end of the second switching tube is connected with the third end of the switch driving unit;

the second end of the second switching tube is connected with one end of the tenth resistor to form a fourth node, and the other end of the tenth resistor is connected with the first end of the switch driving unit;

one end of the seventh resistor is connected with the first end of the second switching tube, the other end of the seventh resistor is connected with the other end of the ninth resistor to form a fifth node, and one end of the ninth resistor is connected with the control end of the second switching tube;

the eighth resistor is connected between the fourth node and the fifth node, and the test switch is connected with the seventh resistor in parallel;

The fourth node is connected with the other end of the first metal shielding wire, and the fifth node is connected with the other end of the second metal shielding wire.

18. The leakage detection interrupt circuit of claim 17, wherein the detection unit further comprises:

the anode of the third diode is used as a third detection end of the detection unit, the cathode of the third diode is connected with one end of the sixth resistor, and the other end of the sixth resistor is connected with the first end of the second switching tube.

19. The leakage detection interrupt circuit of claim 18, wherein the detection unit further comprises:

and the anode of the fourth diode is connected with the other end of the tenth resistor, and the cathode of the fourth diode is connected with the first end of the switch driving unit.

20. The leakage detection interrupt circuit of claim 4, wherein the detection unit comprises:

the first end of the second switching tube is connected with one end of the seventh resistor to form a third node, and the third node is used as a third detection end of the detection unit;

The second end of the second switching tube is connected with one end of the tenth resistor to form a fourth node, the other end of the tenth resistor is connected to the zero line connecting wire, and the fourth node is used as a first detection end of the detection unit;

one end of the ninth resistor is connected with the control end of the second switching tube, the other end of the ninth resistor is connected with the other end of the seventh resistor to form a fifth node, and the fifth node is used as a second detection end of the detection unit;

the eighth resistor is connected between the fourth node and the fifth node, and the second capacitor is connected in parallel with the eighth resistor.

21. The leakage detection interrupt circuit of claim 20, wherein the detection unit further comprises:

the anode of the third diode is used as a third detection end of the detection unit, the cathode of the third diode is connected with one end of the sixth resistor, and the other end of the sixth resistor is connected with the third node.

22. The leakage detection interrupt circuit of claim 21, wherein the detection unit further comprises:

And the anode of the fourth diode is connected with the other end of the tenth resistor, and the cathode of the fourth diode is connected to the zero line connecting line.

23. The electrical leakage detection interrupt circuit of any one of claims 20-22, further comprising:

the test unit comprises a test switch, the test switch is connected with the seventh resistor in parallel, and the fourth node is also connected with the third end of the switch driving unit;

24. The electrical leakage detection interrupt circuit of any one of claims 20-22, further comprising:

the testing unit comprises a testing switch and a fifth resistor, one end of the fifth resistor is connected to the zero line connecting wire, the other end of the fifth resistor is respectively connected with one end of the testing switch and a fourth detection end of the detection unit, and the other end of the testing switch is respectively connected with a third end of the switch driving unit and the fourth node;

25. The leakage detection interrupt circuit of claim 9, wherein the first switch tube is a triode or a thyristor.

26. The leakage detection interrupt circuit of any one of claims 16-22, wherein the second switching tube is a triode or a thyristor.

27. The electrical leakage detection interrupt circuit of claim 9, wherein said trip coil switch further comprises a third contact for connecting to a hot wire of said power source and a fourth contact connected to one end of said hot wire connection wire, wherein said winding is further configured to trigger the switching of said third contact to said fourth contact.

28. A leakage detection interrupter comprising the leakage detection interrupt circuit of any one of claims 1-27.

29. An electrical device comprising the leakage detection interrupt circuit according to any one of claims 1-27.