Dual-detection residual current device

Abstract

The present application relates to the field of electrical technology, and specifically relates to a dual-detection residual current device, comprising: a switch unit, a rectifier module unit, a temperature control detection unit, a leakage detection unit, and a trigger unit. The switch unit is disposed between an input end and an output end, and is used for controlling the input end and the output end to be energized or de-energized. The rectifier module unit is used for providing direct current to a circuit. One end of the temperature control detection unit is connected to an output end of the rectifier module unit and the other end is connected to the trigger unit, the temperature control detection unit being used for detecting the temperature of a power-line plug interface. The leakage current detection unit is disposed around a power line connected between the switch unit and the input end, and is used for detecting whether there is leakage current on the power line. The trigger unit is used for acquiring information from the temperature control detection unit or the leakage current detection unit and controlling opening and closing of the switch unit, thereby cutting off the circuit. The dual-detection residual current device is a residual current device having both temperature control detection and leakage detection functions.

Description

Double detection leakage protector TECHNICAL FIELD

[0001] The utility model belongs to electrical technical field, concretely relates to a double detection leakage protector. BACKGROUND

[0002] Leakage protector is a power line device with plug, which is used for detecting leakage current between power line live wire, zero line and wire shielding layer shield between power supply plug and load electrical appliance (such as air conditioner, dehumidifier) to cut off the power supply of electrical equipment, prevent fire and provide safety protection. The design purpose is to prevent power line damage, insulation strength decline caused by power line aging, wear and tear, extrusion or animal gnawing, thereby avoiding arc fault fire. However, leakage protector (plug) and socket are prone to looseness after a period of use, leading to poor contact, and then high temperature flash when electrified, which may burn plug and socket and even cause fire.

[0003] Therefore, a leakage protector integrating temperature control detection and leakage detection function is urgently needed to solve the defect of the prior art.

[0004] Utility model content

[0005] The utility model provides a double detection leakage protector with temperature control detection and leakage detection in view of the defects and insufficient of prior art.

[0006] In order to realize the above purpose, the technical scheme of the utility model is as follows: the utility model provides a double detection leakage protector, which comprises a switching unit, a rectifier module unit, a temperature control detection unit, a leakage detection unit and a triggering unit.

[0007] The switching unit is arranged between the input end and the output end and is used for controlling the electrification or deenergization of the input end and the output end, the input end comprises a live wire input end and a zero line input end, and the output end comprises a zero line output end electrically connected with the zero line input end and a live wire output end electrically connected with the live wire input end.

[0008] The rectifier module unit is connected between the input end and the output end and is used for providing direct current for the circuit.

[0009] 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 triggering unit, and the temperature control detection unit is used for detecting the temperature of the power line plug-in interface.

[0010] The leakage detection unit is arranged around the power line connected between the switching unit and the input end and is used for detecting whether there is leakage current on the power line.

[0011] The trigger unit is used for acquiring information of the temperature control detection unit or the electric leakage detection unit and controlling opening and closing of the switch unit, so as to cut off the circuit.

[0012] As a further scheme of the utility model, the temperature control detection unit is a temperature control component, one end of the temperature control component is connected to an output end of the rectification module unit, and the other end is connected to the trigger unit.

[0013] As a further scheme of the utility model, the temperature control detection unit comprises 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, the other end is connected to the firewire input end through the resistor R29, a control end of the thyristor SCR1 is connected between the temperature control switch and the resistor R29, a cathode of the thyristor SCR1 is grounded, and an anode of the thyristor SCR1 is connected to the trigger unit in series with the diode D11, the diode D12 and the diode D13.

[0014] As a further scheme of the utility model, the temperature control detection unit comprises a temperature control switch, a resistor R29, a control chip IC1, a triode Q5, a thyristor SCR2, a resistor R30 and a warning light LED4, one end of the temperature control switch is grounded, the other end is connected to the firewire input end through the resistor R29, a base of the triode Q5 is connected between the temperature control switch and the resistor R29, and the base is connected to an input end of the control chip IC1, a control end of the thyristor SCR2 is connected to an output end of the control chip IC1, a cathode of the thyristor SCR2 is grounded, and an anode of the thyristor SCR2 is connected to the rectification module unit output end in series with the warning light LED4 and the resistor R30.

[0015] As a further scheme of the utility model, the trigger unit includes triode Q2, triode Q1, resistance R32, resistance R20, tripping coil SOL, MOS tube Q3, MOS tube Q4, resistance R18, resistance R19, voltage stabilizing resistance ZD3, diode D6, resistance R16, diode D5, resistance R17 resistance R21, diode D10 diode D9, resistance R26, capacitor C11, thyristor SCR, one end of series resistance R18 and resistance R19 is accessed to the output end of the rectifier module unit, and the other end is grounded, one end of series resistance R16, reversely arranged diode D5 and resistance R17 is accessed to the output end of the rectifier module unit, and the other end is grounded, voltage stabilizing resistance ZD3 is connected in series with diode D6, one end is connected between resistance R18 and resistance R19, and the other end is connected between reversely arranged diode D5 and resistance R17, the first switch end of MOS tube Q3 is accessed between resistance R16 and reversely arranged diode D5 through resistance R21, diode D9 is connected in series with resistance R26 and capacitor C11, one end is accessed to the input end of the live wire, and the other end is grounded, the control end of MOS tube Q3 and the first switch end of MOS tube Q4 are all accessed between resistance R26 and capacitor C11, and the control end of MOS tube Q3 and the first switch end of MOS tube Q4 are electrically connected, the second switch end of MOS tube Q3 and the anode of thyristor SCR are electrically connected, and the control end of MOS tube Q4 and the control end of thyristor SCR are all connected to the leakage detection unit, triode Q2, triode Q1, resistance R20 and resistance R32 constitute a signal amplifier mechanism for amplifying circuit signals, one end of the signal amplifier mechanism is accessed to the output end of the rectifier module unit, the other end is accessed between diode D5 and resistance R17, and the input end of tripping coil SOL is connected to the control end, the second switch end of MOS tube Q4, the second switch end of MOS tube Q3, the cathode of thyristor SCR and the output end of tripping coil SOL are all grounded.

[0016] As a further scheme of the utility model, 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,

[0017] The zero sequence mutual inductance detector is accessed to the main control chip IC, the power supply end of the main control chip IC is connected to the input end of the live wire, the main control chip IC is powered, the control end of MOS tube Q4 and the control end of thyristor SCR are electrically connected to the first output end of the main control chip IC and the second output end of the main control chip IC respectively, the leakage information of the zero sequence mutual inductance detector is transmitted to the main control chip IC, and the main control chip IC controls the trigger unit according to the leakage signal.

[0018] As a further scheme of the utility model, the leakage detection unit further includes an indicating lamp LED1, an anode of the indicating lamp LED1 is electrically connected with a second output end of the main control chip IC, and a cathode of the indicating lamp LED1 is grounded.

[0019] As a further scheme of the utility model, a test switch S3 is further included, one end of the test switch S3 is connected to an output end of the rectifier module unit, and the other end is grounded, so as to realize a short circuit test function.

[0020] As a further scheme of the utility model, 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, so as to realize a leakage test function.

[0021] As a further scheme of the utility model, a start indicating lamp is further arranged, the start indicating lamp is connected between the input end and the output end.

[0022] The utility model discloses reached the beneficial effects are: the utility model discloses a double detection leakage protector with temperature control detection and leakage detection double functions, the double detection leakage protector can realize the existence of poor contact, short circuit and the like in the circuit through the temperature control detection function of the temperature control detection unit, when the overcurrent and overheating between the plug and the socket occur, the circuit is automatically cut off (namely the control switch unit is disconnected), the leakage detection unit has leakage detection function and circuit element detection self-checking function, can detect the leakage current on the power line in real time through the leakage detection function, once finding that the leakage current exceeds the safety threshold, can rapidly cut off the circuit (namely the control switch unit is disconnected), through the circuit element detection self-checking function, the circuit element can be detected in time, the application of the double detection leakage protector effectively prevents the occurrence of electrical fire, electric shock and other safety hazards, and the safety of the electric environment is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is a circuit diagram of the utility model embodiment one.

[0024] Fig. 2 is a circuit diagram of the utility model embodiment two.

[0025] Fig. 3 is a circuit diagram of the utility model embodiment three.

[0026] Fig. 4 is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0027] In order to facilitate the person skilled in the art to understand the utility model, the specific implementation mode of the utility model is explained below in combination with the drawings.

[0028] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] Embodiment one

[0031] As shown in FIG. 1 and FIG. 4, it is the technical scheme of embodiment one of the present application, a double detection leakage protector, comprising a switching unit, a rectifier module unit, a temperature control detection unit, a leakage detection unit and a trigger unit;

[0032] The switching unit is arranged between the input end and the output end, for controlling the power-on or power-off of the input end and the output end, the input end includes a live wire input end and a zero line input end, and the output end includes a zero line output end electrically connected with the zero line input end and a live wire output end electrically connected with the live wire input end;

[0033] The rectifier module unit is connected between the input end and the output end, for providing direct current for the circuit;

[0034] 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 line interface;

[0035] The leakage detection unit is arranged around the power line connected between the switching unit and the input end, for detecting whether there is leakage current on the power line;

[0036] The trigger unit is used to obtain the information of the temperature control detection unit or the leakage detection unit and control the opening and closing of the switching unit, so as to cut off the circuit.

[0037] As shown in Figure 1, 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,

[0038] In use, when there is poor contact, short circuit or the like in the circuit, resulting in overcurrent and overheating between the plug and the socket, the temperature control component disconnects and cuts off the circuit, forming an open circuit state, so that the signal amplifier mechanism generates a voltage difference, so that there is current flowing through the trip coil SOL, thereby driving the trip coil SOL to operate the on-off of the switch unit, thereby cutting off the circuit.

[0039] As shown in Figure 1, the trigger unit includes a triode Q2, a triode 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; 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 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 is connected between the diode D5 and the resistor R17 arranged in reverse; the first switch end of the MOS tube Q3 is connected to the resistor R16 and the diode D5 arranged in reverse through the resistor R21; the diode D9 is connected in series with the resistor R26 and the capacitor C11, one end of which is connected to the live input end, and the other end is grounded, the control end of the MOS tube Q3 and the first switch end of the MOS tube Q4 are both connected between the resistor R26 and the capacitor C11, and the control end of the MOS tube Q3 is electrically connected with the first switch end of the MOS tube Q4; the second switch end of the MOS tube Q3 is electrically connected with the anode of the thyristor SCR, and the control end of the MOS tube Q4 and the control end of the thyristor SCR are both connected to the ground fault detection unit; the triode Q2, the triode Q1, the resistor R20 and the resistor R32 constitute 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, the other end is connected between the diode D5 and the resistor R17, and the control end is connected to the input end of the trip coil SOL; the second switch end of the MOS tube Q4, the second switch end of the MOS tube Q3, the cathode of the thyristor SCR and the output end of the trip coil SOL are all grounded.

[0040] The leakage detection unit comprises a zero sequence mutual inductance detector and a master control chip IC, the zero sequence mutual inductance detector is arranged around the power line,

[0041] The zero sequence mutual inductance detector is connected to the master control chip IC, the power supply end of the master control chip IC is connected to the firewire input end to supply power for the master control chip IC, the first output end of the master control chip IC is electrically connected to the control end of the MOS tube Q4, the control end of the thyristor SCR is electrically connected to the second output end of the master control chip IC, the leakage information sensed by the zero sequence mutual inductance detector is transmitted to the master control chip IC, and the master control chip IC controls the trigger unit according to the leakage signal.

[0042] In use, when there is leakage on the circuit, the zero sequence mutual inductance detector detects the leakage, the second output end of the master control chip IC controls the thyristor SCR to be conductive, the MOS tube Q3 is turned off, the circuit voltage is thus pulled down, the signal amplifier mechanism generates a voltage difference, the current flows through the trip coil SOL, and the trip coil SOL is thus driven to operate the on-off of the switch unit, so as to cut off the circuit.

[0043] The circuit is automatically detected in time, and the detection process is that the first output end of the master control chip IC1 controls the MOS tube Q4 to be conductive, so that the MOS tube Q3 is turned off,

[0044] When the MOS tube Q4 and the MOS tube Q3 work normally, the input end of the master control chip IC switches between high and low levels.

[0045] When the MOS tube Q4 and the MOS tube Q3 are damaged, the MOS tube Q3 is continuously in a conductive state, the input end of the master control chip IC is always floating, and the voltage value is unchanged,

[0046] Through the timing inspection of the circuit loop elements, the user can find the abnormal condition of the elements early, and the safety of the electrical equipment and the user is ensured.

[0047] As shown in FIG. 1, the leakage detection unit further comprises an indicating lamp LED1, the anode of the indicating lamp LED1 is electrically connected to the second output end of the master control chip IC, and the cathode of the indicating lamp LED1 is grounded, when the element is abnormal, the indicating lamp LED1 is lighted to remind the user.

[0048] As shown in FIG. 1, 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, so as to realize the short circuit test function.

[0049] As shown in Figure 1, it also includes a leakage test switch S2 connected between the live input end and the live output end to realize the leakage test function.

[0050] As shown in Figure 1, a start indicator lamp is also provided, which is connected between the input end and the output end. When the double detection leakage protector is disconnected, the start indicator lamp LED2 is extinguished to visually alarm and remind the user of the state of the double detection leakage protector.

[0051] Embodiment two

[0052] As shown in Figures 2 and 4, the technical scheme of embodiment two of the utility model is 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.

[0053] The switch unit is arranged between the input end and the output end and is used for controlling the power-on or power-off of the input end and the output end. The input end comprises a live input end and a zero input end. The output end comprises a zero output end electrically connected to the zero input end and a live output end electrically connected to the live input end.

[0054] The rectifier module unit is connected between the input end and the output end and is used for providing direct current for the circuit.

[0055] 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 for detecting the temperature of the power line interface.

[0056] The leakage detection unit is arranged around the power line connected between the switch unit and the input end and is used for detecting whether there is a leakage current on the power line.

[0057] The trigger unit is used for acquiring information of the temperature control detection unit or the leakage detection unit and controlling the opening and closing of the switch unit, so as to cut off the circuit.

[0058] As shown in Figure 2, the temperature control detection unit comprises a temperature control switch F1, a resistor R29, a thyristor SCR1, diodes D11, D12 and D13. One end of the temperature control switch is grounded, and the other end is connected to the live 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 to the trigger unit in series with the diodes D11, D12 and D13.

[0059] In use, when there is poor contact, short circuit and other conditions in the circuit, resulting in overcurrent and overheating between the plug and socket, the temperature control switch is turned off, the thyristor SCR1 is turned on, forming an open circuit state, the signal amplifier mechanism generates a voltage difference, so that the solenoid coil SOL has current flowing through, thereby driving the solenoid coil SOL to operate the on-off of the switch unit, thereby cutting off the circuit; the technical scheme of using the temperature control switch can enable the double detection leakage protector to be used again without replacing the temperature control components.

[0060] As shown in FIG. 2, the temperature control detection unit is provided with a warning light LED3, which is lit when the thyristor SCR1 is turned on, to visually alarm and remind the user of the status of the double detection leakage protector.

[0061] As shown in FIG. 2, the trigger unit includes a transistor Q2, a transistor Q1, a resistor R32, a resistor R20, a solenoid 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; the resistor R18 is connected in series with the resistor R19, one end of which is connected to the output end of the rectification module unit, and the other end is grounded; the resistor R16 is connected in series with the diode D5 and the resistor R17 arranged reversely, one end of which is connected to the output end of the rectification 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 is connected between the diode D5 and the resistor R17 arranged reversely; the first switch end of the MOS tube Q3 is connected to the resistor R16 and the diode D5 arranged reversely through the resistor R21; the diode D9 is connected in series with the resistor R26 and the capacitor C11, one end of which is connected to the live input end, and the other end is grounded, the control end of the MOS tube Q3 and the first switch end of the MOS tube Q4 are both connected between the resistor R26 and the capacitor C11, and the control end of the MOS tube Q3 is electrically connected with the first switch end of the MOS tube Q4; the second switch end of the MOS tube Q3 is electrically connected with the anode of the thyristor SCR, and the control end of the MOS tube 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 constitute a signal amplifier mechanism for amplifying circuit signals, one end of which is connected to the output end of the rectification module unit, the other end is connected between the diode D5 and the resistor R17, and the control end is connected to the input end of the solenoid coil SOL; the second switch end of the MOS tube Q4, the second switch end of the MOS tube Q3, the cathode of the thyristor SCR and the output end of the solenoid coil SOL are all grounded.

[0062] The leakage detection unit comprises a zero sequence mutual inductance detector and a master control chip IC, the zero sequence mutual inductance detector is arranged around the power line,

[0063] The zero sequence mutual inductance detector is connected to the master control chip IC, the power supply end of the master control chip IC is connected to the firewire input end to supply power for the master control chip IC, the first output end of the master control chip IC is electrically connected to the control end of the MOS tube Q4, the control end of the thyristor SCR is electrically connected to the second output end of the master control chip IC, the leakage information sensed by the zero sequence mutual inductance detector is transmitted to the master control chip IC, and the master control chip IC controls the trigger unit according to the leakage signal.

[0064] In use, when there is leakage on the circuit, the zero sequence mutual inductance detector detects the leakage, the second output end of the master control chip IC controls the thyristor SCR to be conductive, the MOS tube Q3 is turned off, the circuit voltage is pulled down, the signal amplifier mechanism generates a voltage difference, and the current flows through the trip coil SOL, thereby driving the trip coil SOL to operate the on-off of the switch unit, and cutting off the circuit.

[0065] The circuit is automatically detected in time, and the detection process is that the first output end of the master control chip IC1 controls the MOS tube Q4 to be conductive, so that the MOS tube Q3 is turned off,

[0066] When the MOS tube Q4 and the MOS tube Q3 work normally, the input end of the master control chip IC switches between high and low levels.

[0067] When the MOS tube Q4 and the MOS tube Q3 are damaged, the MOS tube Q3 is continuously in a conductive state, the input end of the master control chip IC is always floating, and the voltage value is unchanged,

[0068] Through the timing inspection of the circuit loop elements, the user can find the abnormal condition of the elements early, and the safety of the electrical equipment and the user is ensured.

[0069] As shown in FIG. 2, the leakage detection unit further comprises an indicating lamp LED1, the anode of the indicating lamp LED1 is electrically connected to the second output end of the master control chip IC, and the cathode of the indicating lamp LED1 is grounded, when the element is abnormal, the indicating lamp LED1 is lighted to remind the user.

[0070] As shown in FIG. 2, 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, so as to realize the short circuit test function.

[0071] As shown in Figure 2, a leakage test switch S2 is further included, which is connected between the live input end and the live output end to realize a leakage test function.

[0072] As shown in Figure 2, a start indicator lamp is further provided, which is connected between the input end and the output end, and when the double detection leakage protector is disconnected, the start indicator lamp LED2 is extinguished to visually alarm and remind the user of the state of the double detection leakage protector.

[0073] Embodiment three

[0074] As shown in Figures 3 and 4, the technical scheme of embodiment three of the utility model is 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.

[0075] The switch unit is arranged between the input end and the output end, and is used for controlling the power-on or power-off of the input end and the output end, the input end comprises a live input end and a zero input end, and the output end comprises a zero output end electrically connected with the zero input end and a live output end electrically connected with the live input end.

[0076] The rectifier module unit is connected between the input end and the output end, and is used for providing direct current for a circuit.

[0077] 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, and is used for detecting the temperature of a power line interface.

[0078] The leakage detection unit is arranged around the power line connected between the switch unit and the input end, and is used for detecting whether there is a leakage current on the power line.

[0079] The trigger unit is used for acquiring information of the temperature control detection unit or the leakage detection unit and controlling the opening and closing of the switch unit, so as to cut off the circuit.

[0080] As shown in Figure 3, the temperature control detection unit comprises a temperature control switch F1, a resistor R29, a control chip IC1, a triode Q5, a thyristor SCR2, a resistor R30 and a warning lamp LED4, one end of the temperature control switch is grounded, the other end is connected to the live input end through the resistor R29, the base of the triode 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, the anode of the thyristor SCR2 is connected to the output end of the rectifier module unit in series with the warning lamp LED4 and the resistor R30.

[0081] In use, when there is poor contact, short circuit and other conditions in the circuit, resulting in the plug and socket between the overcurrent overheating, the temperature control switch is off, triggering the control chip IC1 operation conduction thyristor SCR2, forming an open circuit state, so that the signal amplifier mechanism produces a voltage difference, so that the trip coil SOL has current flowing through, thereby driving the trip coil SOL operation control switch unit open and close, thereby cutting off the circuit.

[0082] At the same time, when the thyristor SCR2 is turned on, the warning light LED3 is lit, visually warning the user of the status of the double detection leakage protector.

[0083] As shown in Figure 3, 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, 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, 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 is connected between the diode D5 and the resistor R17; the first switch end of the MOS tube Q3 is connected to the resistor R16 and the diode D5 through the resistor R21; the diode D9 is connected in series with the resistor R26 and the capacitor C11, one end of which is connected to the live input end, and the other end is grounded, the control end of the MOS tube Q3 and the first switch end of the MOS tube Q4 are both connected between the resistor R26 and the capacitor C11, and the control end of the MOS tube Q3 is electrically connected with the first switch end of the MOS tube Q4; the second switch end of the MOS tube Q3 is electrically connected with the anode of the thyristor SCR, and the control end of the MOS tube 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 constitute a signal amplifier mechanism for amplifying circuit signals, one end of which is connected to the output end of the rectifier module unit, the other end is connected between the diode D5 and the resistor R17, and the control end is connected to the input end of the trip coil SOL; the second switch end of the MOS tube Q4, the second switch end of the MOS tube Q3, the cathode of the thyristor SCR and the output end of the trip coil SOL are all grounded.

[0084] The leakage detection unit comprises a zero sequence mutual inductance detector and a master control chip IC, the zero sequence mutual inductance detector is arranged around the power line,

[0085] The zero sequence mutual inductance detector is connected to the master control chip IC, the power supply end of the master control chip IC is connected to the firewire input end to supply power for the master control chip IC, the first output end of the master control chip IC is electrically connected to the control end of the MOS tube Q4, the control end of the thyristor SCR is electrically connected to the second output end of the master control chip IC, the leakage information sensed by the zero sequence mutual inductance detector is transmitted to the master control chip IC, and the master control chip IC controls the trigger unit according to the leakage signal.

[0086] In use, when there is leakage on the circuit, the zero sequence mutual inductance detector detects the leakage, the second output end of the master control chip IC controls the thyristor SCR to be conductive, the MOS tube Q3 is turned off, the circuit voltage is thus pulled down, the signal amplifier mechanism generates a voltage difference, the current flows through the trip coil SOL, and the trip coil SOL is thus driven to operate the on-off of the switch unit, so as to cut off the circuit.

[0087] The circuit is automatically detected in time, and the detection process is that the first output end of the master control chip IC1 controls the MOS tube Q4 to be conductive, so that the MOS tube Q3 is turned off,

[0088] When the MOS tube Q4 and the MOS tube Q3 work normally, the input end of the master control chip IC switches between high and low levels.

[0089] When the MOS tube Q4 and the MOS tube Q3 are damaged, the MOS tube Q3 is continuously in a conductive state, the input end of the master control chip IC is always floating, and the voltage value is unchanged,

[0090] Through the timing inspection of the circuit loop elements, the user can find the abnormal condition of the elements early, and the safety of the electrical equipment and the user is ensured.

[0091] As shown in FIG. 3, the leakage detection unit further comprises an indicating lamp LED1, the anode of the indicating lamp LED1 is electrically connected to the second output end of the master control chip IC, and the cathode of the indicating lamp LED1 is grounded, when the element is abnormal, the indicating lamp LED1 is lighted to remind the user.

[0092] As shown in FIG. 3, 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, so as to realize the short circuit test function.

[0093] As shown in Figure 3, a leakage test switch S2 is further included, which is connected between the live input end and the live output end to realize a leakage test function.

[0094] As shown in Figure 3, a start indicator lamp is further provided, which is connected between the input end and the output end, and when the double detection leakage protector is disconnected, the start indicator lamp LED2 is extinguished to visually alarm and remind the user of the state of the double detection leakage protector.

[0095] The above-mentioned embodiments of the utility model do not constitute a limitation on the protection scope of the utility model. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model shall be included in the protection scope of the claims of the utility model.

Claims

1. A dual detection leakage protection device, characterized in that: The switch unit is arranged between the input end and the output end, and is used for controlling the power-on or power-off of the input end and the output end. The temperature control detection unit is connected to the output end of the rectifier module unit at one end and to the trigger unit at the other end, and is used for detecting the temperature of the power line interface.

2. The dual detection ground fault circuit interrupter of claim 1, wherein: The temperature control detection unit is a temperature control component, and 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.

3. The dual detection ground fault circuit interrupter of claim 1, wherein: The temperature control detection unit includes a temperature control switch, a resistor R29, a thyristor SCR1, diodes D11, D12 and D13, one end of the temperature control switch is grounded, the other end is connected to the fire 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 to the trigger unit in series with the diodes D11, D12 and D13.

4. The dual detection ground fault circuit interrupter of claim 1, wherein: 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, the other end is connected to the fire 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 to the output end of the rectifier module unit in series with the warning light LED4 and the resistor R30.

5. The dual detection arc fault protector of any of claims 1-4, wherein: The trigger unit includes a triode Q2, a triode Q1, a resistor R32, a resistor R20, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q2, a triode Q1, a resistor R20, a resistor R32, a triode Q 6. The dual detection ground fault circuit interrupter of claim 5, wherein: ​ 7. The dual detection ground fault circuit interrupter of claim 5, wherein: ​ 8. The dual detection ground fault circuit interrupter of claim 5, wherein: 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, so as to realize the short circuit test function.

9. The dual detection ground fault circuit interrupter of claim 8, wherein: It also includes a leakage test switch S2, which is connected between the live input end and the live output end, so as to realize the leakage test function.

10. The dual detection ground fault circuit interrupter of claim 9, wherein: A start indicator lamp is also provided, which is connected between the input end and the output end.

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