Electric leakage detection interruption circuit, electric leakage detection interrupter and electrical equipment

Abstract

The invention discloses an electric leakage detection interruption circuit, an electric leakage detection interrupter and electrical equipment, and the circuit comprises a switch unit which is used for controlling whether a power supply is connected or not; the switch driving unit is used for controlling the on-off of the switch unit; the shielding unit comprises a conductor shielding layer with a first part and a second part, the first part is configured to wrap the live wire connecting line, and the second part is configured to wrap the zero wire connecting line so as to perform electric leakage detection on the load power supply line; the detection unit comprises a first detection end and a second detection end, the first detection end and the second detection end are connected through the conductor shielding layer, and the detection unit is further connected with the switch driving unit and used for triggering the switch driving unit to control the switch unit to be switched off when it is detected that the conductor shielding layer is open-circuited so as to cut off access of the power supply. The circuit can cut off the access of a power supply when the conductor shielding layer is open-circuited, so that the danger caused by the fact that electric leakage cannot be detected in time can be prevented, and the protection and safety effects are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of leakage detection, and in particular to a leakage detection interruption circuit, a leakage detection interrupter and electrical equipment. Background Art

[0002] At present, leakage protection technology generally detects whether leakage occurs and cuts off the power supply to achieve protection when leakage occurs. However, when the device used for leakage detection is damaged and cannot detect whether leakage occurs, if leakage occurs, the above technology will not detect leakage and will not cut off the power supply, causing safety hazards. Summary of the invention

[0003] One object of the present invention is to provide a leakage detection interrupt circuit, a leakage detection interrupter and an electrical device, so as to cut off the power supply in time when the conductor shielding layer used for leakage detection is open, so as to play a protective and safety role.

[0004] To achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes a leakage detection interrupt circuit, which is suitable for being connected between a power input terminal and a load, and includes: a switch unit, used to control whether the power supply of the power input terminal is connected; a switch drive unit, used to control the on and off of the switch unit; a shielding unit, including a conductor shielding layer, the conductor shielding layer having a first part and a second part, the first part being configured to wrap the live wire connection line in the load power supply line, and the second part being configured to wrap the neutral wire connection line in the load power supply line to perform leakage detection on the load power supply line; a detection unit, including a first detection end and a second detection end, the first detection end and the second detection end are connected through the conductor shielding layer, and the detection unit is also connected to the switch drive unit, and is used to trigger the switch drive unit to control the switch unit to disconnect when it is detected that the conductor shielding layer is open, so as to cut off the access to the power supply.

[0005] In addition, the leakage detection interruption circuit of the above embodiment of the present invention may also have the following additional technical features:

[0006] According to an embodiment of the present invention, one of the first detection terminal and the second detection terminal is connected to the conductor shielding layer through a wire.

[0007] According to one embodiment of the present invention, a first insulating layer is provided on the outer surface of the live wire connecting line, a second insulating layer is provided on the outer surface of the neutral wire connecting line, a third insulating layer is provided on the outer surface of the ground wire connecting line in the load power supply line, a fourth insulating layer is provided on the outer surface of the conducting wire, a first part of the conductor shielding layer is wrapped on the outer surface of the first insulating layer, a second part of the conductor shielding layer is wrapped on the outer surface of the second insulating layer, and a fifth insulating layer is provided on the outer surface of the conductor shielding layer, the outer surface of the third insulating layer and the outer surface of the fourth insulating layer.

[0008] According to an embodiment of the present invention, fillers are used to fill the space between the fifth insulating layer and the conductor shielding layer, the third insulating layer and the fourth insulating layer.

[0009] According to one embodiment of the present invention, the material used for the conductor shielding layer includes metal material and semiconductor material, the metal material includes at least one of gold, silver, copper, iron, aluminum, and alloy, and the semiconductor material includes at least one of carbon, silicon, germanium, and graphene.

[0010] According to one embodiment of the present invention, the conductor shielding layer has a morphology of at least one of a mesh, a sheet, and a strip, and a shape of at least one of a circle, a square, an ellipse, a polygon, and an irregular shape.

[0011] According to one embodiment of the present invention, the connection method between the conductor shielding layer and the conducting wire includes at least one of a mechanical winding connection, a welding connection, and a mechanical locking connection.

[0012] According to one embodiment of the present invention, when the second detection end is connected to the wire, the connection method between the wire and the second detection end and the connection method between the conductor shielding layer and the first detection end include at least one of welding connection, pin connection, and locking plate connection.

[0013] To achieve the above object, a second embodiment of the present invention provides a leakage detection interrupter, including the above leakage detection interrupt circuit.

[0014] To achieve the above object, a third aspect of the present invention provides an electrical device, including the above leakage detection interrupter.

[0015] The leakage detection interrupt circuit, leakage detection interrupter and electrical equipment of the embodiments of the present invention can control the switch unit to disconnect through the switch drive unit to cut off the power supply when the detection unit detects that the conductor shielding layer is open, thereby preventing danger caused by failure to detect leakage in time, and playing a protective and safety role. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the structure of a leakage detection interrupt circuit in some embodiments of the present invention;

[0017] Figure 2 is a schematic diagram of a plug using a leakage detection interruption circuit according to an embodiment of the present invention;

[0018] Figure 3 is a schematic diagram of a plug connection line according to an embodiment of the present invention;

[0019] Figure 4 is a topological diagram of a leakage detection interrupt circuit according to a first specific embodiment of the present invention;

[0020] Figure 5 is a topological diagram of a leakage detection interrupt circuit according to a second specific embodiment of the present invention;

[0021] Figure 6 is a topological diagram of a leakage detection interrupt circuit according to a third specific embodiment of the present invention;

[0022] Figure 7 is a topological diagram of a leakage detection interrupt circuit according to a fourth specific embodiment of the present invention;

[0023] Figure 8 is a structural block diagram of a leakage detection interrupter according to an embodiment of the present invention;

[0024] Fig. 9 It is a structural block diagram of an electrical device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0026] The following describes a leakage detection interrupt circuit, a leakage detection interrupter, and an electrical device according to embodiments of the present invention with reference to the accompanying drawings.

[0027] Figure 1 It is a schematic diagram of the structure of the leakage detection interrupt circuit of the embodiment of the invention.

[0028] like Figure 1 As shown, the leakage detection interruption circuit 100 is suitable for being connected between a power input terminal (such as an AC input terminal) and a load LOAD (such as an electrical device in an air conditioner). The circuit 100 comprises: a switch unit 10, a switch driving unit 11, a shielding unit 12 and a detection unit 13.

[0029] See also Figure 1The switch unit 10 is used to control whether the power supply (such as AC power supply) at the power input end is connected; the switch driving unit 11 is used to control the on and off of the switch unit 10; the shielding unit 12 includes a conductor shielding layer AB, such as Figure 3 As shown, the conductor shielding layer AB has a first part AB1 and a second part AB2, the first part AB1 is configured to wrap the live wire connection line L1 in the load power supply line, and the second part AB2 is configured to wrap the neutral wire connection line N1 in the load power supply line to perform leakage detection on the load power supply line; the detection unit 13 includes a first detection end and a second detection end, the first detection end and the second detection end are connected through the conductor shielding layer AB, and the detection unit 13 is also connected to the switch driving unit 11, and is used to trigger the switch driving unit 11 to control the switch unit 10 to disconnect when it is detected that the conductor shielding layer AB is open, so as to cut off the access to the power supply AC.

[0030] In some embodiments, the detection unit 13 is also used to trigger the switch driving unit 11 to control the switch unit 10 to disconnect when it detects leakage current flowing through the shielding unit 12, so as to cut off the access of the power supply AC, thereby achieving a protective effect when leakage occurs.

[0031] Specifically, see Figure 1 , the load power supply line includes a live wire connection line and a neutral wire connection line. For a three-phase line, the load power supply line may also include a ground wire connection line. The switch unit 10 is used to establish a connection between the load power supply line and the live wire L and the neutral wire N of the power supply AC, wherein the live wire connection line is used to connect the live wire L of the power supply AC, the neutral wire connection line is used to connect the neutral wire N of the power supply AC, and the ground wire connection line is used to connect the ground wire PE of the power supply AC. The detection unit 13 is respectively connected to the conductor shielding layer AB in the shielding unit 12 and the switch driving unit 11, and is used to trigger the switch driving unit 11 to control the switch unit 10 to disconnect when it is detected that the conductor shielding layer AB is open-circuited, so as to cut off the access to the power supply AC. In this way, it can prevent the danger caused by the failure to detect leakage in time due to the open circuit of the shielding unit 12, thereby playing a protective and safety role.

[0032] In an embodiment of the present invention, the leakage detection interruption circuit 100 can be used for a plug, such as Figure 2 As shown in FIG. 1 , the plug may be a plug used in conjunction with electrical appliances such as air conditioners, rice cookers, refrigerators, induction cookers, humidifiers, etc. The plug may include three pins, which are respectively connected to the live wire connection line, the neutral wire connection line, and the ground wire connection line of the load power supply line, so as to correspond to the live wire L, the neutral wire N, and the ground wire PE of the power supply AC. Figure 3 shown.

[0033] In some embodiments, see Figure 1 , Figure 3, one of the first detection terminal and the second detection terminal is connected to the conductor shielding layer AB through the wire CD. For ease of description, the following is an example of the connection between the second detection terminal and the wire CD. Figure 1 , end A is close to the input end and connected to the first detection end, end B is close to the output end, end C is close to the input end and connected to the second detection end, end D is close to the output end, and end B of the conductor shielding layer AB and end D of the wire CD are connected to form a path.

[0034] Since the live wire, neutral wire and ground wire are all conductors (such as copper wires), see Figure 3 , the live wire, neutral wire and ground wire may be wrapped with insulating layers (which may be made of insulating materials such as rubber and plastic), and the insulating materials of the live wire and neutral wire may be wrapped with a conductor shielding layer AB for leakage detection. To further ensure safety, the three wires together with their respective insulating layers and the conductor shielding layer AB may be encapsulated by a sheath (which may be made of insulating materials such as rubber and plastic).

[0035] The length of the conductor shielding layer AB can be set as required, such as Figure 1 As shown, the conductor shielding layer AB is wrapped around the insulation layer surface of part of the neutral line connecting line and the insulation layer surface of part of the live line connecting line.

[0036] When using the above plug, the detection unit 13 can detect whether there is leakage current flowing through the conductor shielding layer AB, and can also detect whether the conductor shielding layer AB is damaged and disconnected. If any of the above situations occurs, the switch driving unit 11 is triggered to control the switch unit 10 to disconnect, so as to cut off the access to the power supply AC and achieve protection. In this way, not only can the access to the power supply AC be cut off when leakage is detected, but also when the conductor shielding layer AB is damaged and the leakage cannot be detected in time, the access to the power supply AC can be cut off, thereby improving the safety and reliability of the operation of the electrical equipment.

[0037] In the embodiments of the present invention, see Figure 3 , the conductor shielding layer AB wraps the live wire and the neutral wire respectively, that is, the conductor shielding layer AB wraps the live wire and the neutral wire in two columnar structures respectively. The wrapping method can be: the starting end is at the intersection of the neutral wire and the live wire, and the live wire is wrapped around the neutral wire for one circle, so that the conductor shielding layer AB completely covers the neutral wire and the live wire. Of course, this wrapping method is relatively rare, and the neutral wire or the live wire can be wrapped around for multiple circles, and the starting end or the ending end is not limited to the intersection.

[0038] In some embodiments, see Figure 3, the outer surface of the live wire connection line L1 is provided with a first insulating layer J1, the outer surface of the neutral wire connection line N1 is provided with a second insulating layer J2, the outer surface of the ground wire connection line PE1 in the load power supply line is provided with a third insulating layer J3, the outer surface of the conductor CD is provided with a fourth insulating layer J4, the first part AB1 of the conductor shielding layer AB is wrapped on the outer surface of the first insulating layer J1, the second part AB2 of the conductor shielding layer AB is wrapped on the outer surface of the second insulating layer J2, and the outer surface of the conductor shielding layer AB, the outer surface of the third insulating layer J3 and the outer surface of the fourth insulating layer J4 are provided with a fifth insulating layer J5. Among them, the fifth insulating layer J5 and the conductor shielding layer AB, the third insulating layer J3 and the fourth insulating layer J4 can be filled with filler TC.

[0039] The material of the conductor shielding layer AB may include metal material and semiconductor material, the metal material includes at least one of gold, silver, copper, iron, aluminum, and alloy, and the semiconductor material includes at least one of carbon, silicon, germanium, and graphene. The conductor shielding layer may be in the form of at least one of mesh, sheet, and strip, and in the shape of at least one of circle, square, ellipse, polygon, and irregular figure.

[0040] The connection method between the conductor shielding layer AB and the wire CD may include at least one of mechanical winding connection, welding connection, and mechanical locking connection. When the second detection end is connected to the wire CD, the connection method between the wire CD and the second detection end, and the connection method between the conductor shielding layer AB and the first detection end may include at least one of welding connection, pin connection, and locking piece connection.

[0041] In some embodiments, Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the switch unit 10 includes: a trip coil switch RY, a first diode D1, a second diode D2 and a first switch tube Q1.

[0042] See also Figure 4 , Figure 5 , Figure 6 , Figure 7The trip coil switch RY includes a first contact 1, a second contact 2 and a winding, wherein the first contact 1 is used to connect the neutral line of the power supply, the second contact 2 is connected to the neutral line connection line in the load power supply line, the first end 5 of the winding is connected to the live line connection line in the load power supply line, the second end 6 of the winding is connected to the cathode of the second diode D2 to form a first node, and the first node is connected to the third detection end of the detection unit 13, wherein the winding is used to trigger the on-off between the first contact 1 and the second contact 2. The cathode of the first diode D1 is connected to the neutral line connection line; the anode of the second diode D2 is connected to the anode of the first diode D1 to form a second node, and the second node is connected to the first end of the switch drive unit 11. The first end of the first switch tube Q1 is connected to the second node, the second end of the first switch tube Q1 is connected to the first node, and the control end of the first switch tube Q1 is connected to the second end of the switch drive unit 11.

[0043] In this embodiment, the first contact 1 and the second contact 2 can be disconnected by the winding trigger, so as to cut off the access of the power supply AC. Specifically, the winding of the tripping coil switch RY is energized 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 the access of the neutral line of the power supply AC is cut off; accordingly, the winding of the tripping coil switch RY loses power, the tripping coil switch RY is not attracted by the magnetic force, the first contact 1 and the second contact 2 are connected, and the access of the neutral line of the power supply AC is connected.

[0044] As some examples, the first switch tube Q1 can be a triode or a thyristor ( Figure 4 , Figure 5 , Figure 6 , Figure 7 The thyristor is shown as an example. The thyristor is a component composed of four layers of PNPN semiconductors, with three electrodes: anode, cathode and control electrode. Its characteristics are: when the anode is connected to a reverse voltage, or the anode is connected to a forward voltage but the control electrode is not connected to a voltage, it will not conduct, and when the anode and the control electrode are connected to a forward voltage at the same time, it will become conductive. Once it is conductive, the control voltage loses its control effect on it, and it will always be in the conductive state regardless of whether there is a control voltage or the polarity of the control voltage.

[0045] Optionally, to further improve the reliability of cutting off the AC power supply, see Figure 4 , Figure 5 , Figure 6 , Figure 7 The trip coil switch RY may also include a third contact 3 and a fourth contact 4, the third contact 3 is used to connect the live wire L of the power supply AC, and the fourth contact 4 is connected to one end of the live wire connecting line, wherein the winding is also used to trigger the on and off of the third contact 3 and the fourth contact 4.

[0046] Specifically, the winding of the trip coil switch RY is energized to generate magnetic force, the trip coil switch RY is sucked open by the magnetic force, and the third contact 3 and the fourth contact 4 are disconnected, thereby cutting off the access to the AC live wire of the power supply; accordingly, the winding of the trip coil switch RY loses power, the trip coil switch RY is not sucked open by the magnetic force, the third contact 3 and the fourth contact 4 are connected, and the access to the AC live wire L of the power supply is achieved.

[0047] Thus, the winding triggers the first contact 1 to be disconnected from the second contact 2, and can also trigger the third contact 3 and the fourth contact 4, thereby improving the reliability of cutting off the power supply AC access.

[0048] In some embodiments, Figure 5 , Figure 6 , Figure 7 As shown, the switch unit 10 further includes: a second varistor ZR2; and a second diode D2 connected in parallel with the second varistor ZR2.

[0049] Specifically, the varistor is a resistor device with nonlinear volt-ampere characteristics, which is mainly used to clamp the voltage when the circuit is subjected to overvoltage, absorb excess current to protect sensitive devices. The second varistor ZR2 can be short-circuited when the voltage at both ends of it changes sharply, so as to melt the current fuse (not shown in the figure) and play a protective role.

[0050] In some embodiments, Figure 5 , Figure 6 , Figure 7 As shown, the leakage detection interrupt circuit 100 may also include: an indication unit 15, including a first resistor R1, a second resistor R2 and a light emitting diode LED1, the first resistor R1, the second resistor R2 and the light emitting diode LED1 are connected in series between the first node and the anode of the first diode D1, wherein the anode of the light emitting diode LED1 is closer to the first node than the cathode of the light emitting diode LED1.

[0051] in, Figure 5 , Figure 6 , Figure 7 The series connection of the first resistor R1, the second resistor R2 and the light-emitting diode LED1 shown is only an example. The second resistor R2, the first resistor R1 and the light-emitting diode LED1 can also be connected in series in sequence, the second resistor R2, the light-emitting diode LED1 and the first resistor R1 can be connected in series in sequence, the first resistor R1, the light-emitting diode LED1 and the second resistor R2 can be connected in series in sequence, the light-emitting diode LED1, the second resistor R2 and the first resistor R1 can be connected in series in sequence, the light-emitting diode LED1, the first resistor R1 and the second resistor R2 can be connected in series in sequence, and so on.

[0052] Specifically, when current flows through the light emitting diode LED1, the light emitting diode LED1 can be illuminated. Therefore, the direction of the current flow or the current state of the leakage detection interruption circuit 100 can be determined by whether the light emitting diode LED1 emits light. The light color of the light emitting diode LED1 can be calibrated as needed, such as red, green, etc.

[0053] In some embodiments, Figure 4 , Figure 5 , Figure 6 As shown, the switch driving unit 11 includes: a first capacitor C1, a third resistor R3, a fourth resistor R4 and an eighth resistor R8.

[0054] See also Figure 4 , Figure 5 , Figure 6 , the first end of the first capacitor C1 serves as the first end of the switch driving unit 11, and the second end of the first capacitor C1 serves as the second end of the switch driving unit 11; the fourth resistor R4 is connected to the first capacitor C1 in parallel; the first end of the third resistor R3 is connected to the second end of the first capacitor C1, and the second end of the third resistor R3 is connected to the first detection end; the first end of the eighth resistor R8 is connected to the first end of the first capacitor C1, and the second end of the eighth resistor R8 is connected to the second end of the third resistor R3.

[0055] Specifically, the first capacitor C1 can stabilize the control electrode and cathode voltage of the first switch tube Q1, and the third resistor R3, the fourth resistor R4 and the eighth resistor R8 can play a voltage dividing role. The specific resistance values ​​can be set as needed.

[0056] In other embodiments, Figure 7 As shown, the switch driving unit 11 includes: a first capacitor C1, a third resistor R3, and a fourth resistor R4.

[0057] See also Figure 7 The first end of the first capacitor C1 serves as the first end of the switch driving unit 11 and is connected to the fourth detection end of the detection unit 13, and the second end of the first capacitor C1 serves as the second end of the switch driving unit 11; the fourth resistor R4 is connected in parallel with the first capacitor C1; the first end of the third resistor R3 is connected to the second end of the first capacitor C1, and the second end of the third resistor R3 is connected to the first detection end of the detection unit 13.

[0058] Specifically, the first capacitor C1 can stabilize the control electrode and cathode voltages of the first switch tube Q1 , and the third resistor R3 and the fourth resistor R4 can play a voltage dividing role. The specific resistance values ​​can be set as needed.

[0059] In some embodiments, Figure 5 , Figure 6 , Figure 7As shown, the leakage detection interrupt circuit 100 also includes: a lightning protection unit 16, including a first varistor ZR1, one end of the first varistor ZR1 is connected to the neutral line connection line in the load power supply line, and the other end of the first varistor ZR1 is connected to the live line connection line in the load power supply line.

[0060] When the grid voltage at both ends of the first varistor ZR1 changes sharply, the resistance will quickly decrease to nearly 0 ohm, short-circuiting the grid voltage of 220V and blowing out the corresponding fuse (not shown in the figure), thereby playing a role of insurance.

[0061] It should be noted that when selecting the first varistor ZR1 for lightning protection, you need to pay attention to the following:

[0062] ①The working environment temperature of the first varistor ZR1 should be within the range specified by the technical conditions;

[0063] ②The first varistor ZR1 should not be installed close to heat-generating or flammable components, with a gap greater than 3 mm to avoid damaging the components;

[0064] ③The surge peak current passing through the first varistor ZR1 should not exceed the "peak current" listed in the technical parameter table of the lightning protection varistor.

[0065] In some embodiments, Figure 4 , Figure 5 As shown, the detection unit 13 includes a photocoupler IC2, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7. The photocoupler IC2 has four pins, which are a cathode of a light emitting diode, an anode of a light emitting diode, an emitter of a phototransistor and a collector of a phototransistor. The emitter of the phototransistor is connected to the second end of the switch driving unit 11, the collector of the phototransistor is connected to the first end of the fifth resistor R5, the cathode of the light emitting diode serves as the first detection end, the anode of the light emitting diode serves as the second detection end, and the cathode of the light emitting diode and the anode of the light emitting diode are two detection pins, the second end of the fifth resistor R5 serves as the third detection end of the detection unit 13, the first end of the sixth resistor R6 is connected to the live wire connection line in the load power supply line, the second end of the sixth resistor R6 is connected to the second detection end, the first end of the seventh resistor R7 is connected to the second detection end, and the second end of the seventh resistor R7 is connected to the first detection end.

[0066] In some embodiments, Figure 6As shown, the detection unit 13 includes a power supply voltage stabilizing chip IC3, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7. The power supply voltage stabilizing chip IC3 has three pins, namely a cathode, an anode and a reference voltage terminal. The anode of the power supply voltage stabilizing chip IC3 serves as a first detection terminal, the reference voltage terminal of the power supply voltage stabilizing chip IC3 serves as a second detection terminal, and the anode and the reference voltage terminal of the power supply voltage stabilizing chip IC3 are two detection pins. The first end of the fifth resistor R5 is connected to the cathode of the power supply voltage stabilizing chip IC3, the second end of the fifth resistor R5 serves as the third detection terminal of the detection unit 13, the first end of the sixth resistor R6 is connected to the live wire connection line in the load power supply line, the second end of the sixth resistor R6 is connected to the second detection terminal, the first end of the seventh resistor R7 is connected to the second detection terminal, and the second end of the seventh resistor R7 is connected to the first detection terminal.

[0067] exist Figure 5 , Figure 6 In the illustrated embodiment, the resistance values ​​of the fifth resistor R5 , the sixth resistor R6 , and the seventh resistor R7 can be set as required.

[0068] In some embodiments, Figure 7 As shown, the detection unit 13 includes a second switch tube Q2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a tenth resistor R10.

[0069] See also Figure 7 , the first end of the tenth resistor R10 serves as the fourth detection end of the detection unit 13, the second end of the tenth resistor R10 serves as the first detection end of the detection unit 13, the first end of the eighth resistor R8 is connected to the second end of the tenth resistor R10, the second end of the eighth resistor R8 serves as the second detection end of the detection unit 13, the first end of the seventh resistor R7 is connected to the second end of the eighth resistor R8, the second end of the seventh resistor R7 serves as the third detection end of the detection unit 13, the first end of the second switch tube Q2 is connected to the second end of the seventh resistor R7, the second end of the second switch tube Q2 is connected to the second end of the tenth resistor R10, and the control end of the second switch tube Q2 is connected to the second detection end through the ninth resistor R9.

[0070] The resistance values ​​of the seventh resistor R7 , the eighth resistor R8 , the ninth resistor R9 and the tenth resistor R10 can be set as required.

[0071] In some embodiments, Figure 5 , Figure 6 , Figure 7 As shown, the leakage detection interruption circuit 100 further includes: a test unit 14, and the test unit 14 includes a test switch TEST.

[0072] See also Figure 5 , Figure 6 , the test switch TEST is connected in parallel with the sixth resistor R6; see Figure 7 , the test switch TEST is connected in parallel with the seventh resistor R7.

[0073] The test switch TEST can be set on the plug and the setting position can be as follows: Figure 2 Specifically, when using the plug, the test switch TEST can be pressed to trigger the switch drive unit 11 to control the switch unit 10 to disconnect, thereby cutting off the power supply AC, thereby preventing leakage and ensuring that the user will not be in danger of electric shock.

[0074] The following are Figure 5 , Figure 6 , Figure 7 Taking the embodiment shown as an example, the working principle of the leakage detection interruption circuit 100 of the embodiment of the present invention is described:

[0075] See also Figure 5 , Figure 6 , Figure 7 When the detection unit 13 detects that there is leakage current from the live wire L to the conductor shielding layer AB, the live wire L, the conductor shielding layer AB, the third resistor R3, the fourth resistor R4, the first diode D1 and the neutral wire N form a current loop, the control electrode voltage of the first switch tube Q1 increases, triggering the first switch tube Q1 to turn on, the live wire L, the winding of the tripping coil switch RY, the first switch tube Q1, and the first diode D1 form a strong current loop, the winding of the tripping coil switch RY generates a strong magnetic force, the tripping coil switch RY is sucked away by the magnetic force, and the power supply is cut off.

[0076] See also Figure 5 , Figure 6 , Figure 7 When the detection unit 13 detects that there is leakage current from the neutral line N to the conductor shielding layer AB, the neutral line N, the conductor shielding layer AB, the third resistor R3, the fourth resistor R4, the second diode D2, the winding of the tripping coil switch RY and the live line L form a current loop, and the control electrode voltage of the first switch tube Q1 increases, triggering the first switch tube Q1 to turn on, and the live line L, the winding of the tripping coil switch RY, the first switch tube Q1, and the first diode D1 form a strong current loop, and the winding of the tripping coil switch RY generates a strong magnetic force, and the tripping coil switch RY is sucked away by the magnetic force, and the power supply is cut off.

[0077] See also Figure 5When the detection unit 13 detects that the conductor shielding layer AB is open, the live wire L, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the first diode D1, and the neutral wire N form a current loop, and the seventh resistor R7 divides the voltage, so that the light-emitting diode of the photocoupler IC2 lights up, and the phototransistor of the photocoupler IC2 is turned on. The live wire L, the winding of the trip coil switch RY, the fifth resistor R5, the phototransistor of the photocoupler IC2, the fourth resistor R4, the first diode D1 and the neutral wire N form a current loop, so that the voltage across the fourth resistor R4 reaches the triggering pole voltage of the first switch tube Q1, and the control pole voltage of the first switch tube Q1 increases, triggering the first switch tube Q1 to turn on, and the live wire L, the winding of the trip coil switch RY, the first switch tube Q1, the first diode D1 and the neutral wire N form a strong current loop, and the winding of the trip coil switch RY generates a strong magnetic force, and the trip coil switch RY is attracted by the magnetic force, and the power supply is cut off.

[0078] See also Figure 6 When it is detected that the conductor shielding layer AB is open, the live wire L, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the first diode D1 and the neutral wire N form a current loop, the seventh resistor R7 divides the voltage, and the voltage across the seventh resistor R7 is greater than the reference voltage Vef of the power supply voltage regulator chip IC3, so that the power supply voltage regulator chip IC3 is turned on, and the live wire L, the winding of the tripping coil switch RY, the fifth resistor R5, the power supply voltage regulator chip IC3, the third resistor R3, the fourth resistor R4, the first diode D1 and the neutral wire N form a current loop, so that the voltage across the fourth resistor R4 reaches the triggering electrode voltage of the first switch tube Q1, and the control electrode voltage of the first switch tube Q1 increases, triggering the first switch tube Q1 to turn on, and the live wire L, the winding of the tripping coil switch RY, the first switch tube Q1, the first diode D1 and the neutral wire N form a strong current loop, and the winding of the tripping coil switch RY generates a strong magnetic force, and the tripping coil switch RY is attracted by the magnetic force, and the power supply is cut off.

[0079] See also Figure 7 When the conductor shielding layer AB is detected to be open, the live wire L, the winding of the tripping coil switch RY, the seventh resistor R7, the eighth resistor R8, the tenth resistor R10, the first diode D1, and the neutral line N form a current loop, and the seventh resistor R7 divides the voltage, so that the second switch tube Q2 is turned on, and the live wire L, the winding of the tripping coil switch RY, the second switch tube Q2, the third resistor R3, the fourth resistor R4, the first diode D1 and the neutral line N form a current loop, so that the voltage across the fourth resistor R4 reaches the triggering pole voltage of the first switch tube Q1, and the control pole voltage of the first switch tube Q1 increases, triggering the first switch tube Q1 to turn on, and the live wire L, the winding of the tripping coil switch RY, the first switch tube Q1, the first diode D1, and the neutral line N form a strong current loop, and the winding of the tripping coil switch RY generates a strong magnetic force, and the tripping coil switch RY is sucked away by the magnetic force, and the power supply is cut off.

[0080] See also Figure 5 , Figure 6 , Figure 7 When the test switch TEST is pressed, the live wire L, the test switch TEST, the wire CD, the conductor shielding layer AB, the third resistor R3, the fourth resistor R4, the first diode D1 and the neutral wire N form a current loop, the control electrode voltage of the first switch tube Q1 increases, triggering the first switch tube Q1 to turn on, the live wire L, the winding of the trip coil switch RY, the first switch tube Q1, the first diode D1 and the neutral wire N form a strong current loop, the winding of the trip coil switch RY generates a strong magnetic force, the trip coil switch RY is sucked away by the magnetic force, and the power supply is cut off.

[0081] The leakage detection interrupt circuit of the embodiment of the present invention can not only control the switch unit to be disconnected and cut off the access of the power supply through the switch driving unit when it is detected that there is leakage current in the live wire L or the neutral wire N to the shielding unit or the test switch is pressed, thereby realizing leakage protection and ensuring the safety of the plug being inserted into the power supply; it can also control the switch unit to be disconnected and cut off the power supply through the switch driving unit when the conductor shielding layer is open, thereby solving the problem of danger caused by failure to detect leakage current in time due to damage and open circuit of the conductor shielding layer, and can better play a protective and safety role.

[0082] Figure 8 It is a structural block diagram of a leakage detection interrupter according to an embodiment of the present invention.

[0083] like Figure 8 As shown, the leakage detection interrupter 300 includes the leakage detection interrupter circuit 100 described above. The leakage detection interrupter 300 may be Figure 2 The three-phase plug shown can also be a two-phase plug, which can be applied according to actual needs.

[0084] The leakage detection interrupter of the embodiment of the present invention, through the above-mentioned leakage detection interrupt circuit, can not only control the switch unit to be disconnected and cut off the access of the power supply through the switch driving unit when it is detected that there is leakage current in the live wire L or the neutral wire N to the shielding unit or the test switch is pressed, thereby realizing leakage protection and ensuring the safety of the plug being inserted into the power supply; it can also control the switch unit to be disconnected and cut off the power supply through the switch driving unit when the conductor shielding layer is open, thereby solving the problem of danger caused by the failure to detect the leakage current in time due to the damage and open circuit of the conductor shielding layer, and can better play a protective and safety role.

[0085] Fig. 9 It is a structural block diagram of an electrical device according to an embodiment of the present invention.

[0086] like Fig. 9 As shown, the electrical device 400 includes the leakage detection interruption circuit 100 of the above embodiment.

[0087] In this embodiment, the electrical device 400 may include an air conditioner, a rice cooker, a refrigerator, an induction cooker, a humidifier, etc.

[0088] The electrical equipment of the embodiment of the present invention, through the above-mentioned leakage detection interrupt circuit, can not only control the switch unit to be disconnected and cut off the access of the power supply through the switch driving unit when it is detected that there is leakage current in the live wire L or the neutral wire N to the shielding unit or the test switch is pressed, thereby realizing leakage protection and ensuring the safety of the plug being inserted into the power supply; it can also control the switch unit to be disconnected and cut off the power supply through the switch driving unit when the conductor shielding layer is open, thereby solving the problem of danger caused by the inability to detect the leakage current in time due to the damage and open circuit of the conductor shielding layer, and can better play a protective and safety role.

[0089] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0090] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0091] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0092] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0093] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0094] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A leakage detection interrupt circuit, characterized in that: The circuit is suitable for being connected between a power input terminal and a load, and comprises: A switch unit, used to control whether the power supply at the power input end is connected; A switch driving unit, used to control the on and off of the switch unit; A shielding unit, comprising a conductor shielding layer, the conductor shielding layer having a first portion and a second portion, the first portion being configured to wrap a live connecting line in the load power supply line, and the second portion being configured to wrap a neutral connecting line in the load power supply line, so as to perform leakage detection on the load power supply line; The detection unit includes a first detection end and a second detection end, wherein the first detection end and the second detection end are connected through the conductor shielding layer. The detection unit is also connected to the switch driving unit and is used to trigger the switch driving unit to control the switch unit to disconnect when it is detected that the conductor shielding layer is open circuited, so as to cut off the access to the power supply.

2. The leakage detection interruption circuit according to claim 1, characterized in that: One of the first detection terminal and the second detection terminal is connected to the conductor shielding layer through a wire.

3. The leakage detection interruption circuit according to claim 2, characterized in that: The outer surface of the live wire connection line is provided with a first insulating layer, the outer surface of the neutral wire connection line is provided with a second insulating layer, the outer surface of the ground wire connection line in the load power supply line is provided with a third insulating layer, the outer surface of the conducting wire is provided with a fourth insulating layer, the first part of the conductor shielding layer is wrapped on the outer surface of the first insulating layer, the second part of the conductor shielding layer is wrapped on the outer surface of the second insulating layer, and the outer surface of the conductor shielding layer, the outer surface of the third insulating layer and the outer surface of the fourth insulating layer are provided with a fifth insulating layer.

4. The leakage detection interruption circuit according to claim 3, characterized in that: Fillers are used to fill the space between the fifth insulating layer and the conductor shielding layer, the third insulating layer and the fourth insulating layer.

5. The leakage detection interruption circuit according to claim 1, characterized in that: The material used for the conductor shielding layer includes metal material and semiconductor material. The metal material includes at least one of gold, silver, copper, iron, aluminum, and alloys. The semiconductor material includes at least one of carbon, silicon, germanium, and graphene.

6. The leakage detection interruption circuit according to claim 1, characterized in that: The conductor shielding layer may be in the form of at least one of a mesh, a sheet, and a strip, and may be in the shape of at least one of a circle, a square, an ellipse, a polygon, and an irregular shape.

7. The leakage detection interruption circuit according to claim 2, characterized in that: The connection method between the conductor shielding layer and the wire includes at least one of mechanical winding connection, welding connection, and mechanical locking connection.

8. The leakage detection interruption circuit according to claim 2, characterized in that: When the second detection end is connected to the wire, a connection method between the wire and the second detection end and a connection method between the conductor shielding layer and the first detection end include at least one of a welding connection, a pin connection, and a locking piece connection.

9. A leakage detection interrupter, characterized in that: It comprises the leakage detection interruption circuit according to any one of claims 1-8.

10. An electrical device, characterized in that: It comprises the leakage detection interruption circuit according to any one of claims 1-8.

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