Dual-detection leakage protector

Abstract

The utility model belongs to the field of electrical technology, and particularly relates to a double-detection leakage protector, which comprises a switch unit, a rectifier module unit, a temperature control detection unit, a leakage detection unit and a trigger unit. The switch unit is arranged between an input end and an output end and used for controlling the input end and the output end to be powered on or powered off, and the rectification module unit is used for providing direct current for a circuit; one end of the temperature control detection unit is connected to the output end of the rectifier module unit, and the other end of the temperature control detection unit is connected to the trigger unit and used for detecting the temperature of a power line interface; the electric leakage detection unit surrounds a power line connected between the switch unit and the input end and is used for detecting whether current leaks on the power line or not; and the trigger unit is used for acquiring information of the temperature control detection unit or the electric leakage detection unit and controlling on and off of the switch unit so as to cut off the circuit. The double-detection electric leakage protector has double functions of temperature control detection and electric leakage detection.

Description

Technical Field

[0001] The utility model belongs to the field of electrical technology, and in particular relates to a double-detection leakage protector. Background Art

[0002] A leakage current protector (RCD) is a device attached to a power cord with a plug. It detects leakage current between the live and neutral wires of the power cord and the shielding of the conductors, connecting the power plug to an electrical load (such as an air conditioner or dehumidifier). This device disconnects power to the equipment, preventing fire and providing safety protection. It is designed to prevent damage to the power cord caused by aging, wear, squeezing, or animal bites, which can lead to a decrease in insulation strength and arc fault fires. However, the connection between the RCD (plug) and the socket can become loose after a period of use, resulting in poor contact. This can cause high-temperature flashovers when power is applied, potentially burning the plug and socket and even causing a fire.

[0003] Therefore, there is an urgent need for a leakage protector that integrates temperature control detection and leakage detection functions to solve this defect of existing products. Utility Model Content

[0004] In view of the defects and shortcomings of the existing technology, the utility model provides a dual-detection leakage protector with temperature control detection and leakage detection.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows: the present invention provides a dual-detection leakage protector, comprising a switch unit, a rectifier module unit, a temperature control detection unit, a leakage detection unit and a trigger unit;

[0006] The switch unit is provided between the input end and the output end, and is used to control the power on or off of the input end and the output end, wherein the input end includes a live wire input end and a neutral wire input end, and the output end includes a neutral wire output end electrically connected to the neutral wire input end and a live wire output end electrically connected to the live wire input end;

[0007] The rectifier module unit is connected between the input end and the output end to provide direct current to the circuit;

[0008] One end of the temperature control detection unit is connected to the output end of the rectifier module unit, and the other end is connected to the trigger unit, for detecting the temperature of the power cord plug interface;

[0009] The leakage detection unit is arranged around the power line connected between the switch unit and the input end, and is used to detect whether there is leakage current on the power line;

[0010] The trigger unit is used to obtain information from the temperature control detection unit or the leakage detection unit and control the opening and closing of the switch unit, thereby cutting off the circuit.

[0011] As a further solution of the present invention, the temperature control detection unit is a temperature control component, one end of the temperature control component is connected to the output end of the rectifier module unit, and the other end is connected to the trigger unit.

[0012] As a further solution of the present invention, the temperature control detection unit includes a temperature controlled switch, a resistor R29, a thyristor SCR1, a diode D11, a diode D12 and a diode D13. One end of the temperature controlled switch is grounded, and the other end is connected to the live wire input end through the resistor R29. The control end of the thyristor SCR1 is connected between the temperature controlled switch and the resistor R29. The cathode of the thyristor SCR1 is grounded, and the anode of the thyristor SCR1 is connected in series with the diode D11, the diode D12 and the diode D13 to connect to the trigger unit.

[0013] As a further solution of the present invention, the temperature control detection unit includes a temperature control switch, a resistor R29, a control chip IC1, a transistor Q5, a thyristor SCR2, a resistor R30, and a warning light LED4. One end of the temperature control switch is grounded, and the other end is connected to the live wire input end through the resistor R29. The base of the transistor Q5 is connected between the temperature control switch and the resistor R29, and is connected to the input end of the control chip IC1. The control end of the thyristor SCR2 is connected to the output end of the control chip IC1. The cathode of the thyristor SCR2 is grounded, and the anode of the thyristor SCR2 is connected in series with the warning light LED4 and the resistor R30 to access the output end of the rectifier module unit.

[0014] As a further solution of the present invention, the trigger unit includes a transistor Q2, a transistor Q1, a resistor R32, a resistor R20, a trip coil SOL, a MOS tube Q3, a MOS tube Q4, a resistor R18, a resistor R19, a voltage-stabilizing resistor ZD3, a diode D6, a resistor R16, a diode D5, a resistor R17, a resistor R21, a diode D10, a diode D9, a resistor R26, a capacitor C11, and a thyristor SCR; one end of the resistor R18 and the resistor R19 are connected in series with the rectifier module unit output The output terminal of the rectifier module is connected to the output terminal of the rectifier module, and the other end is grounded; the resistor R16 is connected in series with the diode D5 and the resistor R17, one end of which is connected to the output terminal of the rectifier module unit, and the other end is grounded; the voltage-stabilizing resistor ZD3 is connected in series with the diode D6, one end of which is connected between the resistor R18 and the resistor R19, and the other end of which is connected between the diode D5 and the resistor R17, which are arranged in opposite directions; the first switch end of the MOS tube Q3 is connected between the resistor R16 and the diode D5, which are arranged in opposite directions, through the resistor R21; The diode D9 is connected in series with the resistor R26 and the capacitor C11, with one end connected to the live wire input terminal and the other end grounded. The control terminal of the MOS transistor Q3 and the first switch terminal of the MOS transistor Q4 are both connected between the resistor R26 and the capacitor C11, and the control terminal of the MOS transistor Q3 is electrically connected to the first switch terminal of the MOS transistor Q4. The second switch terminal of the MOS transistor Q3 is electrically connected to the anode of the thyristor SCR, and the control terminal of the MOS transistor Q4 and the control terminal of the thyristor SCR are both connected to the leakage detection unit. The transistor Q2, the transistor Q1, the resistor R20, and the resistor R32 form a signal amplifier mechanism for amplifying circuit signals. One end of the signal amplifier mechanism is connected to the output terminal of the rectifier module unit and the other end is connected between the diode D5 and the resistor R17. The control end is connected to the input terminal of the trip coil SOL. The second switch terminal of the MOS transistor Q4, the second switch terminal of the MOS transistor Q3, the cathode of the thyristor SCR, and the output terminal of the trip coil SOL are all grounded.

[0015] As a further solution of the present invention, the leakage detection unit includes a zero-sequence mutual inductance detector and a main control chip IC. The zero-sequence mutual inductance detector is arranged around the power line.

[0016] The zero-sequence mutual inductance detector is connected to the main control chip IC, and the power supply end of the main control chip IC is connected to the live wire input end to power the main control chip IC; the first output end of the main control chip IC is electrically connected to the control end of the MOS tube Q4, and the control end of the thyristor SCR is electrically connected to the second output end of the main control chip IC. The zero-sequence mutual inductance detector senses leakage information and transmits it to the main control chip IC. The main chip IC controls the trigger unit according to the leakage signal.

[0017] As a further solution of the present invention, the leakage detection unit further includes an indicator light LED1, the anode of the indicator light LED1 is electrically connected to the second output terminal of the main control chip IC, and the cathode of the indicator light LED1 is grounded.

[0018] As a further solution of the present invention, a test switch S3 is further included, one end of the test switch S3 is connected to the output end of the rectifier module unit, and the other end is grounded to realize a short-circuit test function.

[0019] As a further solution of the present invention, a leakage test switch S2 is further included. The leakage test switch S2 is connected between the live wire input end and the live wire output end to realize a leakage test function.

[0020] As a further solution of the present invention, a start indicator light is further provided, and the start indicator light is connected between the input end and the output end.

[0021] The beneficial effects achieved by the present invention are as follows: the present invention is a dual-detection leakage protector with dual functions of temperature control detection and leakage detection. The dual-detection leakage protector can realize that when there are poor contact, short circuit and the like in the circuit, resulting in overcurrent and overheating between the plug and the socket, the circuit will be automatically cut off (that is, the control switch unit is disconnected) through the temperature control detection function of the temperature control detection unit; the leakage detection unit has a leakage detection function and a circuit element detection self-test function. The leakage detection function can detect the leakage current on the power line in real time. Once it is found that the leakage current exceeds the safety threshold, the circuit can be quickly cut off (that is, the control switch unit is disconnected). The circuit element detection self-test function can perform self-tests on circuit elements at regular intervals. The application of the dual-detection leakage protector effectively prevents the occurrence of safety hazards such as electrical fires and electric shock accidents, and greatly improves the safety of the power environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a circuit diagram of Example 1 of the utility model.

[0023] Figure 2 This is a circuit diagram of embodiment 2 of the present utility model.

[0024] Figure 3 This is a circuit diagram of embodiment 3 of the present utility model.

[0025] Figure 4 It is a schematic structural diagram of the utility model. DETAILED DESCRIPTION

[0026] To facilitate those skilled in the art to understand the present invention, specific implementations of the present invention are described below with reference to the accompanying drawings.

[0027] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0029] Example 1

[0030] like Figure 1 and Figure 4 As shown, it is a technical solution of embodiment 1 of the present utility model, a dual-detection leakage protector, including a switch unit, a rectifier module unit, a temperature control detection unit, a leakage detection unit and a trigger unit;

[0031] The switch unit is provided between the input end and the output end, and is used to control the power on or off of the input end and the output end, wherein the input end includes a live wire input end and a neutral wire input end, and the output end includes a neutral wire output end electrically connected to the neutral wire input end and a live wire output end electrically connected to the live wire input end;

[0032] The rectifier module unit is connected between the input end and the output end to provide direct current to the circuit;

[0033] One end of the temperature control detection unit is connected to the output end of the rectifier module unit, and the other end is connected to the trigger unit, for detecting the temperature of the power cord plug interface;

[0034] The leakage detection unit is arranged around the power line connected between the switch unit and the input end, and is used to detect whether there is leakage current on the power line;

[0035] The trigger unit is used to obtain information from the temperature control detection unit or the leakage detection unit and control the opening and closing of the switch unit, thereby cutting off the circuit.

[0036] like Figure 1As shown, the temperature control detection unit is a temperature control component F1, one end of the temperature control component is connected to the output end of the rectifier module unit, and the other end is connected to the trigger unit; the temperature control component is arranged between the output end of the rectifier module unit and the trigger unit,

[0037] During use, when there is poor contact, short circuit, etc. in the circuit, resulting in overcurrent and overheating between the plug and socket, the temperature control component disconnects and cuts off the circuit, forming an open circuit state, causing the signal amplifier mechanism to generate a voltage difference, so that current flows through the trip coil SOL, thereby driving the trip coil SOL to operate the control switch unit to open and close, thereby cutting off the circuit.

[0038] like Figure 1 As shown, the trigger unit includes a transistor Q2, a transistor Q1, a resistor R32, a resistor R20, a trip coil SOL, a MOS transistor Q3, a MOS transistor Q4, a resistor R18, a resistor R19, a voltage-stabilizing resistor ZD3, a diode D6, a resistor R16, a diode D5, a resistor R17, a resistor R21, a diode D10, a diode D9, a resistor R26, a capacitor C11, and a thyristor SCR; the resistor R18 is connected in series with the resistor R19, one end of which is connected to the output end of the rectifier module unit and the other end is grounded; the resistor R16 is connected in series with the diode D5 and the resistor R17, which are arranged in reverse, one end of which is connected to the output end of the rectifier module unit and the other end is grounded; the voltage-stabilizing resistor ZD3 is connected in series with the diode D6, one end of which is connected between the resistor R18 and the resistor R19 and the other end of which is connected between the diode D5 and the resistor R17, which are arranged in reverse; the first switch end of the MOS transistor Q3 is connected between the resistor R16 and the diode D5, which are arranged in reverse, through the resistor R21; the diode D The resistor R26 and the capacitor C11 are connected in series, one end of which is connected to the live wire input terminal and the other end is grounded. The control end of the MOS transistor Q3 and the first switch end of the MOS transistor Q4 are both connected between the resistor R26 and the capacitor C11, and the control end of the MOS transistor Q3 is electrically connected to the first switch end of the MOS transistor Q4. The second switch end of the MOS transistor Q3 is electrically connected to the anode of the thyristor SCR, and the control end of the MOS transistor Q4 and the control end of the thyristor SCR are both connected to the leakage detection unit. The transistor Q2, the transistor Q1, the resistor R20, and the resistor R32 form a signal amplifier mechanism for amplifying circuit signals. One end of the signal amplifier mechanism is connected to the output end of the rectifier module unit and the other end is connected between the diode D5 and the resistor R17. The control end is connected to the input end of the trip coil SOL. The second switch end of the MOS transistor Q4, the second switch end of the MOS transistor Q3, the cathode of the thyristor SCR, and the output end of the trip coil SOL are all grounded.

[0039] The leakage detection unit includes a zero-sequence mutual inductance detector and a main control chip IC. The zero-sequence mutual inductance detector is arranged around the power line.

[0040] The zero-sequence mutual inductance detector is connected to the main control chip IC, and the power supply end of the main control chip IC is connected to the live wire input end to power the main control chip IC; the first output end of the main control chip IC is electrically connected to the control end of the MOS tube Q4, and the control end of the thyristor SCR is electrically connected to the second output end of the main control chip IC. The zero-sequence mutual inductance detector senses leakage information and transmits it to the main control chip IC. The main chip IC controls the trigger unit according to the leakage signal.

[0041] During use, when there is leakage in the circuit, the zero-sequence mutual inductance detector detects the leakage, and the second output terminal of the main control chip IC controls the thyristor SCR to turn on, turning off the MOS tube Q3, thereby lowering the circuit voltage and generating a voltage difference in the signal amplifier mechanism. Current flows through the trip coil SOL, thereby driving the trip coil SOL to operate and control the opening and closing of the switch unit, thereby cutting off the circuit;

[0042] The circuit performs automatic detection at regular intervals. The detection process is as follows: the first output terminal of the main control chip IC1 controls the MOS tube Q4 to be turned on, so that the MOS tube Q3 is turned off.

[0043] When the MOS transistor Q4 and the MOS transistor Q3 operate normally, the input terminal of the main control chip IC switches between high and low levels.

[0044] When the MOS transistor Q4 and the MOS transistor Q3 are damaged, the MOS transistor Q3 will remain in the on state, the input end of the main control chip IC will remain suspended, and the voltage value will remain unchanged.

[0045] By regularly checking circuit loop components, users can detect component anomalies early and ensure the safety of electrical equipment and users.

[0046] like Figure 1 As shown, the leakage detection unit also includes an indicator light LED1, the anode of the indicator light LED1 is electrically connected to the second output end of the main control chip IC, and the cathode of the indicator light LED1 is grounded. When the component is abnormal, the indicator light LED1 lights up to remind the user.

[0047] like Figure 1 As shown, a test switch S3 is also included, one end of which is connected to the output end of the rectifier module unit and the other end is grounded to achieve a short-circuit test function.

[0048] like Figure 1As shown, a leakage test switch S2 is also included. The leakage test switch S2 is connected between the live wire input end and the live wire output end to realize the leakage test function.

[0049] like Figure 1 As shown, a start indicator light is also provided, which is connected between the input end and the output end. When the dual-detection leakage protector is disconnected, the start indicator light LED2 goes out, and a visual alarm is given to remind the user of the status of the dual-detection leakage protector.

[0050] Example 2

[0051] like Figure 2 and Figure 4 As shown, it is the technical solution of the second embodiment of the present utility model, a dual-detection leakage protector, including a switch unit, a rectifier module unit, a temperature control detection unit, a leakage detection unit and a trigger unit;

[0052] The switch unit is provided between the input end and the output end, and is used to control the power on or off of the input end and the output end, wherein the input end includes a live wire input end and a neutral wire input end, and the output end includes a neutral wire output end electrically connected to the neutral wire input end and a live wire output end electrically connected to the live wire input end;

[0053] The rectifier module unit is connected between the input end and the output end to provide direct current to the circuit;

[0054] One end of the temperature control detection unit is connected to the output end of the rectifier module unit, and the other end is connected to the trigger unit, for detecting the temperature of the power cord plug interface;

[0055] The leakage detection unit is arranged around the power line connected between the switch unit and the input end, and is used to detect whether there is leakage current on the power line;

[0056] The trigger unit is used to obtain information from the temperature control detection unit or the leakage detection unit and control the opening and closing of the switch unit, thereby cutting off the circuit.

[0057] like Figure 2 As shown, the temperature control detection unit includes a temperature control switch F1, a resistor R29, a thyristor SCR1, a diode D11, a diode D12 and a diode D13. One end of the temperature control switch is grounded, and the other end is connected to the live wire input end through the resistor R29. The control end of the thyristor SCR1 is connected between the temperature control switch and the resistor R29. The cathode of the thyristor SCR1 is grounded. The anode of the thyristor SCR1 is connected in series with the diodes D11, D12 and D13 to connect to the trigger unit.

[0058] During use, when there is poor contact, short circuit, etc. in the circuit, resulting in overcurrent and overheating between the plug and socket, the temperature control switch is disconnected, and the thyristor SCR1 is turned on, forming an open circuit state, causing the signal amplifier mechanism to generate a voltage difference, so that current flows through the trip coil SOL, thereby driving the trip coil SOL to operate and control the opening and closing of the switch unit, thereby cutting off the circuit; the technical solution of using the temperature control switch can enable the dual-detection leakage protector to be reactivated without replacing the temperature control components.

[0059] like Figure 2 As shown, the temperature control detection unit is provided with a warning light LED3. When the thyristor SCR1 is turned on, the warning light LED3 lights up, giving a visual alarm to remind the user to double-check the status of the leakage protector.

[0060] like Figure 2As shown, the trigger unit includes a transistor Q2, a transistor Q1, a resistor R32, a resistor R20, a trip coil SOL, a MOS transistor Q3, a MOS transistor Q4, a resistor R18, a resistor R19, a voltage-stabilizing resistor ZD3, a diode D6, a resistor R16, a diode D5, a resistor R17, a resistor R21, a diode D10, a diode D9, a resistor R26, a capacitor C11, and a thyristor SCR; the resistor R18 is connected in series with the resistor R19, one end of which is connected to the output end of the rectifier module unit and the other end is grounded; the resistor R16 is connected in series with the diode D5 and the resistor R17, which are arranged in reverse, one end of which is connected to the output end of the rectifier module unit and the other end is grounded; the voltage-stabilizing resistor ZD3 is connected in series with the diode D6, one end of which is connected between the resistor R18 and the resistor R19 and the other end of which is connected between the diode D5 and the resistor R17, which are arranged in reverse; the first switch end of the MOS transistor Q3 is connected between the resistor R16 and the diode D5, which are arranged in reverse, through the resistor R21; the diode D The resistor R26 and the capacitor C11 are connected in series, one end of which is connected to the live wire input terminal and the other end is grounded. The control end of the MOS transistor Q3 and the first switch end of the MOS transistor Q4 are both connected between the resistor R26 and the capacitor C11, and the control end of the MOS transistor Q3 is electrically connected to the first switch end of the MOS transistor Q4. The second switch end of the MOS transistor Q3 is electrically connected to the anode of the thyristor SCR, and the control end of the MOS transistor Q4 and the control end of the thyristor SCR are both connected to the leakage detection unit. The transistor Q2, the transistor Q1, the resistor R20, and the resistor R32 form a signal amplifier mechanism for amplifying circuit signals. One end of the signal amplifier mechanism is connected to the output end of the rectifier module unit and the other end is connected between the diode D5 and the resistor R17. The control end is connected to the input end of the trip coil SOL. The second switch end of the MOS transistor Q4, the second switch end of the MOS transistor Q3, the cathode of the thyristor SCR, and the output end of the trip coil SOL are all grounded.

[0061] The leakage detection unit includes a zero-sequence mutual inductance detector and a main control chip IC. The zero-sequence mutual inductance detector is arranged around the power line.

[0062] The zero-sequence mutual inductance detector is connected to the main control chip IC, and the power supply end of the main control chip IC is connected to the live wire input end to power the main control chip IC; the first output end of the main control chip IC is electrically connected to the control end of the MOS tube Q4, and the control end of the thyristor SCR is electrically connected to the second output end of the main control chip IC. The zero-sequence mutual inductance detector senses leakage information and transmits it to the main control chip IC. The main chip IC controls the trigger unit according to the leakage signal.

[0063] During use, when there is leakage in the circuit, the zero-sequence mutual inductance detector detects the leakage, and the second output terminal of the main control chip IC controls the thyristor SCR to turn on, turning off the MOS tube Q3, thereby lowering the circuit voltage and generating a voltage difference in the signal amplifier mechanism. Current flows through the trip coil SOL, thereby driving the trip coil SOL to operate and control the opening and closing of the switch unit, thereby cutting off the circuit;

[0064] The circuit performs automatic detection at regular intervals. The detection process is as follows: the first output terminal of the main control chip IC1 controls the MOS tube Q4 to be turned on, so that the MOS tube Q3 is turned off.

[0065] When the MOS transistor Q4 and the MOS transistor Q3 operate normally, the input terminal of the main control chip IC switches between high and low levels.

[0066] When the MOS transistor Q4 and the MOS transistor Q3 are damaged, the MOS transistor Q3 will remain in the on state, the input end of the main control chip IC will remain suspended, and the voltage value will remain unchanged.

[0067] By regularly checking circuit loop components, users can detect component anomalies early and ensure the safety of electrical equipment and users.

[0068] like Figure 2 As shown, the leakage detection unit also includes an indicator light LED1, the anode of the indicator light LED1 is electrically connected to the second output end of the main control chip IC, and the cathode of the indicator light LED1 is grounded. When the component is abnormal, the indicator light LED1 lights up to remind the user.

[0069] like Figure 2 As shown, a test switch S3 is also included, one end of which is connected to the output end of the rectifier module unit and the other end is grounded to achieve a short-circuit test function.

[0070] like Figure 2 As shown, a leakage test switch S2 is also included. The leakage test switch S2 is connected between the live wire input end and the live wire output end to realize the leakage test function.

[0071] like Figure 2 As shown, a start indicator light is also provided, which is connected between the input end and the output end. When the dual-detection leakage protector is disconnected, the start indicator light LED2 goes out, and a visual alarm is given to remind the user of the status of the dual-detection leakage protector.

[0072] Example 3

[0073] like Figure 3 and Figure 4As shown, it is the technical solution of the third embodiment of the present utility model, a dual-detection leakage protector, including a switch unit, a rectifier module unit, a temperature control detection unit, a leakage detection unit and a trigger unit;

[0074] The switch unit is provided between the input end and the output end, and is used to control the power on or off of the input end and the output end, wherein the input end includes a live wire input end and a neutral wire input end, and the output end includes a neutral wire output end electrically connected to the neutral wire input end and a live wire output end electrically connected to the live wire input end;

[0075] The rectifier module unit is connected between the input end and the output end to provide direct current to the circuit;

[0076] One end of the temperature control detection unit is connected to the output end of the rectifier module unit, and the other end is connected to the trigger unit, for detecting the temperature of the power cord plug interface;

[0077] The leakage detection unit is arranged around the power line connected between the switch unit and the input end, and is used to detect whether there is leakage current on the power line;

[0078] The trigger unit is used to obtain information from the temperature control detection unit or the leakage detection unit and control the opening and closing of the switch unit, thereby cutting off the circuit.

[0079] like Figure 3 As shown, the temperature control detection unit includes a temperature control switch F1, a resistor R29, a control chip IC1, a transistor Q5, a thyristor SCR2, a resistor R30, and a warning light LED4. One end of the temperature control switch is grounded, and the other end is connected to the live wire input end through the resistor R29. The base of the transistor Q5 is connected between the temperature control switch and the resistor R29, and is connected to the input end of the control chip IC1. The control end of the thyristor SCR2 is connected to the output end of the control chip IC1, the cathode of the thyristor SCR2 is grounded, and the anode of the thyristor SCR2 is connected in series with the warning light LED4 and the resistor R30 to connect to the output end of the rectifier module unit.

[0080] During use, when there is poor contact, short circuit, etc. in the circuit, resulting in overcurrent and overheating between the plug and socket, the temperature control switch is disconnected, triggering the control chip IC1 to operate and turn on the thyristor SCR2, forming an open circuit state, causing the signal amplifier mechanism to generate a voltage difference, so that current flows through the trip coil SOL, thereby driving the trip coil SOL to operate and control the opening and closing of the switch unit, thereby cutting off the circuit.

[0081] At the same time, when the thyristor SCR2 is turned on, the warning light LED3 lights up, giving a visual alarm to remind the user to double-check the status of the leakage protector.

[0082] like Figure 3 As shown, the trigger unit includes a transistor Q2, a transistor Q1, a resistor R32, a resistor R20, a trip coil SOL, a MOS transistor Q3, a MOS transistor Q4, a resistor R18, a resistor R19, a voltage-stabilizing resistor ZD3, a diode D6, a resistor R16, a diode D5, a resistor R17, a resistor R21, a diode D10, a diode D9, a resistor R26, a capacitor C11, and a thyristor SCR; the resistor R18 is connected in series with the resistor R19, one end of which is connected to the output end of the rectifier module unit and the other end is grounded; the resistor R16 is connected in series with the diode D5 and the resistor R17, which are arranged in reverse, one end of which is connected to the output end of the rectifier module unit and the other end is grounded; the voltage-stabilizing resistor ZD3 is connected in series with the diode D6, one end of which is connected between the resistor R18 and the resistor R19 and the other end of which is connected between the diode D5 and the resistor R17, which are arranged in reverse; the first switch end of the MOS transistor Q3 is connected between the resistor R16 and the diode D5, which are arranged in reverse, through the resistor R21; the diode D The resistor R26 and the capacitor C11 are connected in series, one end of which is connected to the live wire input terminal and the other end is grounded. The control end of the MOS transistor Q3 and the first switch end of the MOS transistor Q4 are both connected between the resistor R26 and the capacitor C11, and the control end of the MOS transistor Q3 is electrically connected to the first switch end of the MOS transistor Q4. The second switch end of the MOS transistor Q3 is electrically connected to the anode of the thyristor SCR, and the control end of the MOS transistor Q4 and the control end of the thyristor SCR are both connected to the leakage detection unit. The transistor Q2, the transistor Q1, the resistor R20, and the resistor R32 form a signal amplifier mechanism for amplifying circuit signals. One end of the signal amplifier mechanism is connected to the output end of the rectifier module unit and the other end is connected between the diode D5 and the resistor R17. The control end is connected to the input end of the trip coil SOL. The second switch end of the MOS transistor Q4, the second switch end of the MOS transistor Q3, the cathode of the thyristor SCR, and the output end of the trip coil SOL are all grounded.

[0083] The leakage detection unit includes a zero-sequence mutual inductance detector and a main control chip IC. The zero-sequence mutual inductance detector is arranged around the power line.

[0084] The zero-sequence mutual inductance detector is connected to the main control chip IC, and the power supply end of the main control chip IC is connected to the live wire input end to power the main control chip IC; the first output end of the main control chip IC is electrically connected to the control end of the MOS tube Q4, and the control end of the thyristor SCR is electrically connected to the second output end of the main control chip IC. The zero-sequence mutual inductance detector senses leakage information and transmits it to the main control chip IC. The main chip IC controls the trigger unit according to the leakage signal.

[0085] During use, when there is leakage in the circuit, the zero-sequence mutual inductance detector detects the leakage, and the second output terminal of the main control chip IC controls the thyristor SCR to turn on, turning off the MOS tube Q3, thereby lowering the circuit voltage and generating a voltage difference in the signal amplifier mechanism. Current flows through the trip coil SOL, thereby driving the trip coil SOL to operate and control the opening and closing of the switch unit, thereby cutting off the circuit;

[0086] The circuit performs automatic detection at regular intervals. The detection process is as follows: the first output terminal of the main control chip IC1 controls the MOS tube Q4 to be turned on, so that the MOS tube Q3 is turned off.

[0087] When the MOS transistor Q4 and the MOS transistor Q3 operate normally, the input terminal of the main control chip IC switches between high and low levels.

[0088] When the MOS transistor Q4 and the MOS transistor Q3 are damaged, the MOS transistor Q3 will remain in the on state, the input end of the main control chip IC will remain suspended, and the voltage value will remain unchanged.

[0089] By regularly checking circuit loop components, users can detect component anomalies early and ensure the safety of electrical equipment and users.

[0090] like Figure 3 As shown, the leakage detection unit also includes an indicator light LED1, the anode of the indicator light LED1 is electrically connected to the second output end of the main control chip IC, and the cathode of the indicator light LED1 is grounded. When the component is abnormal, the indicator light LED1 lights up to remind the user.

[0091] like Figure 3 As shown, a test switch S3 is also included, one end of which is connected to the output end of the rectifier module unit and the other end is grounded to achieve a short-circuit test function.

[0092] like Figure 3 As shown, a leakage test switch S2 is also included. The leakage test switch S2 is connected between the live wire input end and the live wire output end to realize the leakage test function.

[0093] like Figure 3 As shown, a start indicator light is also provided, which is connected between the input end and the output end. When the dual-detection leakage protector is disconnected, the start indicator light LED2 goes out, and a visual alarm is given to remind the user of the status of the dual-detection leakage protector.

[0094] The above-described embodiments of the present invention do not limit the scope of protection of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A dual-detection leakage protector, characterized by: The circuit comprises a switch unit, a rectifier module unit, a temperature control detection unit, a leakage detection unit, and a trigger unit; the switch unit is arranged between the input end and the output end, and is used to control the power on or off of the input end and the output end; the input end includes a live wire input end and a neutral wire input end; the output end includes a neutral wire output end electrically connected to the neutral wire input end and a live wire output end electrically connected to the live wire input end; the rectifier module unit is connected between the input end and the output end, and is used to provide direct current to the circuit; One end of the temperature control detection unit is connected to the output end of the rectifier module unit, and the other end is connected to the trigger unit, which is used to detect the temperature of the power cord plug interface; the leakage detection unit surrounds the power cord connected between the switch unit and the input end, and is used to detect whether there is leakage current on the power cord; the trigger unit is used to obtain information from the temperature control detection unit or the leakage detection unit and control the opening and closing of the switch unit, thereby cutting off the circuit.

2. The dual-detection leakage protector according to claim 1, characterized in that: The temperature control detection unit is a temperature control component, one end of which is connected to the output end of the rectifier module unit, and the other end is connected to the trigger unit.

3. The dual-detection leakage protector according to claim 1, characterized in that: The temperature control detection unit includes a temperature control switch, a resistor R29, a thyristor SCR1, a diode D11, a diode D12 and a diode D13. One end of the temperature control switch is grounded, and the other end is connected to the live wire input end through the resistor R29. The control end of the thyristor SCR1 is connected between the temperature control switch and the resistor R29. The cathode of the thyristor SCR1 is grounded, and the anode of the thyristor SCR1 is connected in series with the diodes D11, D12 and D13 to connect to the trigger unit.

4. The dual-detection leakage protector according to claim 1, characterized in that: The temperature control detection unit includes a temperature control switch, a resistor R29, a control chip IC1, a transistor Q5, a thyristor SCR2, a resistor R30, and a warning light LED4. One end of the temperature control switch is grounded, and the other end is connected to the live wire input end through the resistor R29. The base of the transistor Q5 is connected between the temperature control switch and the resistor R29 and is connected to the input end of the control chip IC1. The control end of the thyristor SCR2 is connected to the output end of the control chip IC1. The cathode of the thyristor SCR2 is grounded, and the anode of the thyristor SCR2 is connected in series with the warning light LED4 and the resistor R30 to be connected to the output end of the rectifier module unit.

5. The dual-detection leakage protector according to any one of claims 1 to 4, characterized in that: The trigger unit includes a transistor Q2, a transistor Q1, a resistor R32, a resistor R20, a trip coil SOL, a MOS transistor Q3, a MOS transistor Q4, a resistor R18, a resistor R19, a voltage-stabilizing resistor ZD3, a diode D6, a resistor R16, a diode D5, a resistor R17, a resistor R21, a diode D10, a diode D9, a resistor R26, a capacitor C11, and a thyristor SCR; the resistor R18 is connected in series with the resistor R19, one end of which is connected to the output end of the rectifier module unit and the other end is grounded; the resistor R16 is connected in series with the diode D5 and the resistor R17, which are arranged in opposite directions, one end of which is connected to the output end of the rectifier module unit and the other end is grounded; the voltage-stabilizing resistor ZD3 is connected in series with the diode D6, one end of which is connected between the resistor R18 and the resistor R19 and the other end of which is connected between the diode D5 and the resistor R17, which are arranged in opposite directions; the first switch end of the MOS transistor Q3 is connected between the resistor R16 and the diode D5, which are arranged in opposite directions, through the resistor R21; the diode D9 The resistor R26 and the capacitor C11 are connected in series, one end of which is connected to the live wire input terminal and the other end is grounded. The control end of the MOS transistor Q3 and the first switch end of the MOS transistor Q4 are both connected between the resistor R26 and the capacitor C11, and the control end of the MOS transistor Q3 is electrically connected to the first switch end of the MOS transistor Q4. The second switch end of the MOS transistor Q3 is electrically connected to the anode of the thyristor SCR, and the control end of the MOS transistor Q4 and the control end of the thyristor SCR are both connected to the leakage detection unit. The transistor Q2, the transistor Q1, the resistor R20, and the resistor R32 form a signal amplifier mechanism for amplifying circuit signals. One end of the signal amplifier mechanism is connected to the output end of the rectifier module unit and the other end is connected between the diode D5 and the resistor R17. The control end is connected to the input end of the trip coil SOL. The second switch end of the MOS transistor Q4, the second switch end of the MOS transistor Q3, the cathode of the thyristor SCR, and the output end of the trip coil SOL are all grounded.

6. The dual-detection leakage protector according to claim 5, characterized in that: The leakage detection unit includes a zero-sequence mutual inductance detector and a main control chip IC. The zero-sequence mutual inductance detector is arranged around the power line. The zero-sequence mutual inductance detector is connected to the main control chip IC, and the power supply end of the main control chip IC is connected to the live wire input end to power the main control chip IC; the first output end of the main control chip IC is electrically connected to the control end of the MOS tube Q4, and the control end of the thyristor SCR is electrically connected to the second output end of the main control chip IC. The zero-sequence mutual inductance detector senses leakage information and transmits it to the main control chip IC. The main chip IC controls the trigger unit according to the leakage signal.

7. The dual-detection leakage protector according to claim 6, characterized in that: The leakage detection unit further includes an indicator light LED1 , an anode of the indicator light LED1 is electrically connected to the second output terminal of the main control chip IC, and a cathode of the indicator light LED1 is grounded.

8. The dual-detection leakage protector according to claim 5, characterized in that: It also includes a test switch S3, one end of which is connected to the output end of the rectifier module unit and the other end is grounded to achieve a short-circuit test function.

9. The dual-detection leakage protector according to claim 8, characterized in that: It also includes a leakage test switch S2, which is connected between the live wire input end and the live wire output end to achieve a leakage test function.

10. The dual-detection leakage protector according to claim 9, characterized in that: A start indicator light is also provided, and the start indicator light is connected between the input end and the output end.

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