CN204992157U - Miniature earth leakage protection socket - Google Patents

Miniature earth leakage protection socket Download PDF

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Publication number
CN204992157U
CN204992157U CN201520580658.4U CN201520580658U CN204992157U CN 204992157 U CN204992157 U CN 204992157U CN 201520580658 U CN201520580658 U CN 201520580658U CN 204992157 U CN204992157 U CN 204992157U
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China
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module
power
coupled
resistance
socket
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CN201520580658.4U
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Chinese (zh)
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陈长安
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Wenzhou Chenghang Electrical Appliance Co Ltd
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Wenzhou Chenghang Electrical Appliance Co Ltd
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Abstract

The utility model discloses a miniature earth leakage protection socket, which comprises a socket body, socket ontology is provided with a plurality of general purpose jacks and a plug, be coupled through a power bus between plug and the general purpose jack, power bus includes that power live wire end, power zero line end and power ground wire hold, a power live wire end and power zero line end coupling an in mutual -inductor, the mutual -inductor has been coupled leakage protection circuit, the mutual -inductor coupling has a simulation electric leakage module, simulation electric leakage module includes movable contact on the other hand, when manual contact is pressed, mutual -inductor output electric leakage electric current, leakage protection circuit is including sampling module, judge module, executable module, the sampling module is coupled in the output of mutual -inductor for sampling electric leakage electric current, the judge module is coupled in the sampling module, when the mutual -inductor produces the electric leakage electric current, and output executive signal, the executable module is coupled in the judge module, when receiving executive signal, jumps the power supply of disconnected external power source to the socket.

Description

Miniature earth leakage protective socket
Technical field
The utility model relates to a kind of socket, and more particularly, it relates to miniature earth leakage protective socket.
Background technology
Socket, also known as supply socket, combined socket and switch, comprises some international general-purpose holes and a plug, can insert various wiring by it, be convenient to and other circuit ON, for multiple power consumption equipment is powered, in order to meet protection requirements, general socket is also provided with leakage protection circuit, for the power supply of the disconnecting plug end of incoming cables when there is leakage current, to play the protective effect to power consumption equipment;
Same; socket water inlet or human body touch live wire part in socket general-purpose hole by mistake; also can make to occur big current in the power supply electric wire of socket; make the adaptive polarizing memory voltage time constant action in leakage protection circuit; thus play an effect preventing electric shock from improving fail safe; and the function of leakage protection circuit, be indispensable critical function for socket, and by internationally recognized be the important basis for estimation of safety index.
But general socket only arranges a leakage protection circuit control relay device drives contact action to realize power-off energising, but because actuating mechanism, adaptive polarizing memory voltage time constant, sampling coil, decision circuitry all may go wrong, any one module goes wrong and leakage protection circuit all can be made to occur misoperation, if false tripping is broken, so whole socket just can not normally be used; If do not jump disconnected when leaking electricity, so produced problem directly can have influence on the personal safety of user.And sampling decision circuitry precision is at present also for reaching higher standard, can affect the fail safe judging and use equally;
For the socket of function singleness, the problem of its corresponding fail safe is less, along with function is abundanter, when designing, the safeguard procedures done on circuit are needed also to get more and more, because the fail safe of socket directly affects normal operation and the useful life of power consumption equipment, and correspondence, need a kind of multipurpose socket that can improve fail safe.
Utility model content
For the deficiency that prior art exists, the purpose of this utility model is to provide a kind of high accuracy and the miniature earth leakage protective socket of tape test function.
For achieving the above object, the utility model provides following technical scheme: miniature earth leakage protective socket, comprise jack body, described jack body is provided with some general-purpose jacks and a plug, coupled by a power bus between described plug and general-purpose jack, power bus comprises power firestreak end, zero-power line end and ground-side of power, described power firestreak end and zero-power line end are coupled in an instrument transformer, described instrument transformer is coupled with leakage protection circuit, described instrument transformer is coupled with a simulation electric leakage module, described simulation electric leakage module comprises a manual contact, when manual contact is pressed, described instrument transformer exports leakage current, described leakage protection circuit, comprises sampling module, judge module, Executive Module, described sampling module is coupled to the output of instrument transformer, for leakage current of sampling, described judge module is coupled to sampling module, when instrument transformer produces leakage current, exports executive signal, Executive Module is coupled to judge module, when receiving executive signal, jumps disconnected external power source to the power supply of socket.
Such setting, under normal circumstances, identical with common leakage protection circuit operation principle, when producing when leaking electricity, electric current on live wire or zero line increases suddenly, instrument transformer collects curent change, and current value is sampled by sampling module, after judge module judges, work is controlled by executive circuit, specific works principle and leakage protection circuit more or less the same, therefore not to repeat here, the utility model is intended to design a kind of simulation electric leakage module, simulation electric leakage module comprises a manual contact, user is by pressing manual contact simulation drain conditions, if all modules all do not go wrong in leakage protection circuit, so will jump the power supply of disconnected external power source to socket, and module installation is reasonable, facilitate Expanding design and understanding, if external power source still keeps the power supply to socket after user presses manual contact, so user just can know that in its leakage protection circuit, a module goes wrong, the possibility reducing potential safety hazard appearance can be overhauled to it.
The utility model can be set to further: described socket is also provided with reset button, for recovering the power supply of external power source to socket.Manually reset button is set; can recover the power supply to socket when leakage protection circuit or other safety circuits jump electricity, difference and total push-button switch are arranged, can not because of the power supply recovered in the unwitting situation of user socket; simple and reasonable, and ensure that the reasonability of setting.
The utility model can be set to further: described jack body is also provided with the different USB interface of some power outputs, described power firestreak end and zero-power line end are coupled with power supply circuits, and described power supply circuits are used for AC conversion to become direct current to USB interface.Original earth leakage protective basis arranges power supply circuits for connecing the direct current supplys such as expansion to USB; while guarantee fail safe; add function of the present invention; and this function setting is on jack body; be easy to use and manufacture, the deficiency above the fail safe overcoming original band USB socket on market.
The utility model can be set to further: described power supply circuits comprise rectification voltage reduction module, and the alternating current for inputting external communication carries out rectification step-down and exports a supply power voltage; Switch power module, comprises an output and and compensates end; The magnet exciting coil intercoupled, output winding, feedback coil, described magnet exciting coil is coupled to the output of switch power module in order to carry out excitation to output winding; Described output winding is in order to load supplying; Described feedback coil is coupled to the compensation end of switch power module; The feedback current of the output current size of output winding is followed in described feedback coil sampling one, and described switch power module exports the exciting current of magnet exciting coil to make output current for certain value according to feedback current compensation.
By such setting, magnet exciting coil, output winding can be powered to it, and by feedback coil, the electric current exported is sampled, switch power module is according to the difference of output current value, export and compensate, the electric current that it is exported is a steady state value, can ensure that output current is not because disturbance appears in the situations such as load variations like this, and carry out supply current input by rectification voltage reduction module, directly direct current is become to carry out electricity consumption the AC conversion of outside, instead of external adapter, rationally convenient.
The utility model can be set to further: be all coupled with charging circuit between described power supply circuits and each USB interface, and described charging circuit detects power consumption equipment charged state, and reminds user's charging complete when power consumption equipment is in Full Power State.
The utility model can be set to further: described charging circuit comprises detection module, is series at the feeder ear of USB interface, and provides a sampled voltage; Lithium battery protection module, is coupled to detection module, receives sampled voltage and exports charged state level; Base modules, arranges a reference level; Comparison module, compares charged state level and reference level, and exports index signal; Indicating module, is coupled to comparison module, comprises two light-emitting components, controls the work of one light-emitting component according to index signal state.Can when charging; by lithium battery protection module, charged state is protected; the principle of the lithium battery protection module of its principle and USB first charging circuit is similar; but when charging complete; the current potential of one of them output pin of lithium battery protection module can change; utilize this potential change that Logic judgment is set; potential change after utilizing charging not complete and complete; by this reference of reference level; export index signal and control indicating module, thus control two light-emitting components export different signals to remind user's charging complete.
The utility model can be set to further: also comprise the first lightning protection circuit, described first lightning protection circuit comprises the first detecting unit and the second detecting unit, described first detecting unit is coupled to power firestreak end for being detected voltage in real time, and export the first detection signal, described second detecting unit is coupled to zero-power line end for being detected voltage in real time, and export the second detection signal, described first detecting unit and the second detecting unit are all coupled to the first gas discharge tube, described first gas discharge tube in response to the first detection signal or the second detection signal to realize opening and closing.By the first detecting unit, the second detecting unit, live wire, zero line are detected in real time, avoid forgetting that the situation causing electrical equipment to damage lightning protection function unlatching occurs.
The utility model can be set to further: described first detecting unit and the second detecting unit are piezo-resistance.
The utility model can be set to further: be provided with piezo-resistance between described power firestreak end and zero-power line end.The operation principle of piezo-resistance is as follows: when being added in the threshold value of the voltage in piezo-resistance lower than it, the electric current flowing through it is minimum, and it is equivalent to the infinitely-great resistance of resistance.That is, when being added in the voltage above it lower than its threshold value, it is equivalent to the switch of an off-state; When being added in the voltage in piezo-resistance and exceeding its threshold value, the electric current flowing through it increases sharply, and it is equivalent to the infinitesimal resistance of resistance.That is, when being added in the voltage above it higher than its threshold value, it is equivalent to the switch of a closure state.Its principle is similar to TVS pipe.
The utility model can be set to further: also comprise the second lightning protection circuit, second lightning protection circuit is coupled between the first lightning protection circuit and load, described second lightning protection circuit comprises the second gas discharge tube, the second coil, the 3rd gas discharge tube and tertiary coil, described second gas discharge tube is series at power firestreak end, described second coils from parallel connection of coils is in the second gas discharge tube, described 3rd gas discharge tube is series at zero-power line end, and described tertiary coil is parallel to the 3rd gas discharge tube.The operation principle of gas discharge tube is gas discharge, when applied voltage increases above the dielectric strength of gas, the gap of two interpolars is by discharge breakdown, be converted into conduction state by original state of insulation, the voltage after conducting between discharge tube the two poles of the earth maintains the residual voltage level of putting electric arc channel and determining.
By adopting technique scheme, compared to existing technology, serve following effect: under normal circumstances, identical with common leakage protection circuit operation principle, when producing when leaking electricity, electric current on live wire or zero line increases suddenly, instrument transformer collects curent change, and current value is sampled by sampling module, after judge module judges, work is controlled by executive circuit, specific works principle and leakage protection circuit more or less the same, therefore not to repeat here, the utility model is intended to design a kind of simulation electric leakage module, simulation electric leakage module comprises a manual contact, user is by pressing manual contact simulation drain conditions, if all modules all do not go wrong in leakage protection circuit, so will jump the power supply of disconnected external power source to socket, and module installation is reasonable, facilitate Expanding design and understanding, if external power source still keeps the power supply to socket after user presses manual contact, so user just can know that in its leakage protection circuit, a module goes wrong, the possibility reducing potential safety hazard appearance can be overhauled to it.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is leakage protection circuit schematic diagram of the present utility model;
Fig. 3 is rectification voltage reduction module schematic diagram of the present utility model;
Fig. 4 is power supply circuits schematic diagram of the present utility model;
Fig. 5 is the first charging circuit schematic diagram of the present utility model;
Fig. 6 is the second charging circuit schematic diagram of the present utility model;
Fig. 7 is the utility model leakage protection circuit schematic diagram.
Reference numeral: 1, jack body; 2, the first USB interface; 3, secondary USB interface; 4, testing button; 5, reset button; 6, power supply indicator; 110a, sampling module; 120a, judge module; 130a, Executive Module; 140a, simulation electric leakage module; 150a, instrument transformer; 210a, rectification voltage reduction module; 211a, voltage regulation unit; 220a, switch power module; 231a, magnet exciting coil; 232a, output winding; 233a, feedback coil; 241a, the first filter unit; 242a, the second filter unit; 243a, output unit; 310a, detection module; 311a, the first sampling unit; 312a, the second sampling unit; 320a, lithium battery protection module; 330a, base modules; 340a, comparison module; 350a, indicating module; 400a, wiring board circuit; 410a, the first lightning protection circuit; 411a, the first detecting unit; 410a, the second detecting unit; 420a, the second lightning protection circuit; 430a, detection control circuit; 440a, indicating circuit.
Embodiment
Be described further referring to figs. 1 through 7 pairs of the utility model embodiments.
As shown in Figure 1, miniature earth leakage protective socket, comprise some general-purpose jacks and a plug, coupled by a power bus between described plug and general-purpose jack, power bus comprises power firestreak end, zero-power line end and ground-side of power, jack body 1 includes the first USB interface 2 and secondary USB interface 3, charging current corresponding to two USB interface is different, the corresponding charging current of the first USB interface 2 is 2.5A, to make can be charged to equipment such as mobile phones fast by the first USB interface 2, and the corresponding charging current of secondary USB interface 3 is 1.2A, so that ordinary appliances can charge normal, two different USB interface are to be applicable to different environment and state, leave if worry, then quick charge can be adopted, leave if be not eager, then can adopt common charging modes, jack body is still provided with testing button 4 and reset button 5 simultaneously, by testing button to realize whether having drain conditions to wiring board, if no problem, then directly press reset button 5 can realize resetting, thus wiring board can normally be used, jack body is also provided with power supply indicator 6 and first indicator light corresponding with the first USB interface 2, second indicator light corresponding with secondary USB interface 3, by the setting of above-mentioned indicator light so that display working condition, be convenient to the state that user understands charging.
Leakage protection circuit and lightning protection circuit are directly connected to bus for detecting the current/voltage situation of bus, and rectification voltage reduction module and power supply circuits are used for providing a galvanic current to be depressed into charging circuit exports to USB interface.
With reference to shown in Fig. 2, leakage protection module is described in detail, described power firestreak end and zero-power line end are coupled in an instrument transformer 150a, described instrument transformer 150a is coupled with leakage protection circuit, described instrument transformer 150a is coupled with a simulation electric leakage module 140a, described simulation electric leakage module 140a comprises a manual contact, and when manual contact is pressed, described instrument transformer 150a exports leakage current; Described leakage protection circuit, comprises sampling module 110a, judge module 120a, Executive Module 130a; Described sampling module 110a is coupled to the output of instrument transformer 150a, for leakage current of sampling; Described judge module 120a is coupled to sampling module 110a, when instrument transformer 150a produces leakage current, exports executive signal; Executive Module 130a is coupled to judge module 120a, when receiving executive signal, jumps disconnected external power source to the power supply of socket.Described simulation electric leakage module 140a is coupled between power firestreak end and zero-power line end, comprises the first artifical resistance and the second artifical resistance that are arranged in series with manual contact.In other embodiments, described judge module 120a can be configured to any chip, and namely it can be used as with realizing signal input/output function the chip use be configured, and in the present embodiment, preferred judge module 120a is configured to SN4140 chip.Described sampling module 110a comprises the first derided capacitors and the second derided capacitors that are series at instrument transformer 150a, and the node that described first derided capacitors and the second derided capacitors couple is connected to the 3rd pin of SN4140 chip; First derided capacitors is set to 100nf, and the second derided capacitors is provided with 10nf, to provide 2.9V voltage of voltage regulation.
Also be coupled with sampling capacitance and sampling resistor between second pin of described SN4140 chip and the first derided capacitors, described sampling capacitance capacity setting is 10uf, and sampling resistor is set to 10 ohm.Be coupled with reset capacitance between 8th pin of described SN4140 chip and the first pin, reset capacitance capacity setting is 22uf; Also pull-up resistor is coupled with between first pin of described SN4140 chip and the 4th pin.Pull-up resistor resistance is set to 30K Europe, described Executive Module 130a comprises the relay and controllable silicon that are arranged in series, its model is set to MCR100-8, and described silicon controlled controlled terminal is coupled to the 7th pin of described SN4140 chip, and described silicon controlled negative electrode is connected to the 6th pin.Be coupled with parasitic capacitance between described controllable silicon negative electrode and controlled terminal, described parasitic capacitance is set to 10nf.6th pin of described SN4140 chip is coupled with indicating module, and described indicating module comprises the protective resistance, light-emitting diode, the protection diode that are arranged in series.Be coupled with piezo-resistance between power firestreak end and zero-power line end, described protective resistance is set to 39 kilo-ohms, and described R6 and R7 is connected to the 5th pin of SN4140, and resistance is set to 68K Europe, and described piezo-resistance model is set to 7D471.
With reference to shown in Fig. 3, rectification voltage reduction module 210a, the alternating current for inputting external communication carries out rectification step-down and exports a supply power voltage; Rectification voltage reduction module 210a adopts BM10F with being rectification step-down chip, described DC decompression module also comprises a voltage regulation unit 211a, described voltage regulation unit 211a comprises the first electric capacity of voltage regulation C8 and the first voltage regulation resistance R10 that are arranged in series, and the node coupled between described first electric capacity of voltage regulation C8 and the first voltage regulation resistance R10 is for exporting supply power voltage.Described voltage regulation unit 211a also comprises the second electric capacity of voltage regulation C7 and the first voltage stabilizing inductance L 4 that are arranged in series, and described first voltage stabilizing inductance L 4 is arranged in parallel with described first voltage regulation resistance R10.First voltage regulation resistance R10 resistance is set to 470 ohm, and the first electric capacity of voltage regulation C8 is set to 8.8uF/400V, and described second electric capacity of voltage regulation C7 is set to 8.8uF/400V.
With reference to shown in Fig. 4, switch power module 220a, comprises an output and and compensates end; Described switch power module 220a is configured to CX7181 chip, and described feedback coil 233a is coupled to the 3rd pin of described CX7181 chip by a feedback resistance R15.Feedback resistance R15 resistance is set to 20K Europe, the first dropping resistor R8 and the second dropping resistor R12 is in series with between the output of described rectification voltage reduction module 210a and the first pin of CX7181 chip, first dropping resistor R8 and the second dropping resistor R12 resistance are set to 100K ohm, for providing operating voltage for VDD, power down diode is coupled with between described second dropping resistor R12 and feedback resistance R15, pawn electric diode breakdown time, described CX7181 chip power-down, its second pin be provided with C11 electric capacity and and the 3rd pin between be provided with R16 resistance, the resistance of R16 resistance is set to 2.7K ohm, 4th pin is held with ground and is provided with three R17 be arranged in parallel, R18, R19, its resistance is all set to 2.7K ohm, equivalent resistance is 900 ohm, described 6th pin is used for constant current output and is provided with shroud module, described shroud module comprises the first mask capacitor C6 be arranged in series, first shielding resistance R11 and first shielding diode D3, secondary shielding resistance R9 is also coupled with between the negative electrode of described first shielding diode D3 and the output of rectification module, first shielding resistance R11 resistance is set to 100 ohm, secondary shielding resistance R9 resistance is set to the effect that 10000 ohm are played power dissipation.
The magnet exciting coil 231a intercoupled, output winding 232a, feedback coil 233a, described magnet exciting coil 231a is coupled to the output of switch power module 220a in order to carry out excitation to output winding 232a; Described output winding 232a is in order to load supplying; Described feedback coil 233a is coupled to the compensation end of switch power module 220a;
The feedback current of the output current size of output winding 232a is followed in described feedback coil 233a sampling one, and described switch power module 220a exports the exciting current of magnet exciting coil 231a to make output current for certain value according to feedback current compensation.Described output winding 232a is coupled with output module, and described output module comprises the first filter unit 241a and the second filter unit 242a, and described first filter unit 241a comprises the first filter resistance R14 and the first filter capacitor C9 that are arranged in series; Described second filter unit 242a comprises the second filter resistance R13 and the second filter capacitor C10 that are arranged in series.First filtering filter capacitor is set to 10V/470uF, and the first filter resistance R14 resistance is set to 1K ohm, and the second filter resistance R13 resistance is set to 220 ohm.Described output module also comprises output unit 243a, described output unit 243a comprises output diode D2 and outputting inductance L3, and described first filter capacitor C9 and the second filter capacitor C10 is all coupled to the node that described output diode D2 and outputting inductance L3 couples.Output diode D2 is set to LSL1045B.
Describe in detail the first charging circuit with reference to Fig. 5, described first charging circuit comprises detection module 310a, is series at the feeder ear of USB interface, and provides a sampled voltage; Described detection module 310a comprises the first sampling unit 311a and the second sampling unit 312a, and described first sampling unit 311a comprises the first sampling resistor R35 and the second sampling resistor R41 that are arranged in parallel; Described second sampling unit 312a comprises the 3rd resistance and the 4th resistance that are arranged in parallel, is also coupled with the first detection resistance R29 between described first sampling unit 311a and the second sampling unit 312a, and described first detection resistance R29 resistance is adjustable.First sampling resistor R35 and the second resistance are set to 50 ohm, and the 3rd sampling resistor R26 and the 4th sampling resistor R30 resistance are even 300 ohm, and first detects resistance R29 resistance is preferably 0 ohm.
Lithium battery protection module 320a, is coupled to detection module 310a, receives sampled voltage and exports charged state level; Described lithium battery protection module 320a is configured to CECL1303 chip, and its first pin coupling exports charged state level, and its 4th pin is coupled to sampled voltage.Also be coupled with the 3rd protective resistance R20 between first pin of described CECL1303 chip and the 4th pin, the 4th of described CECL1303 chip is also coupled with the 4th protective resistance R21 between pin and charging voltage.
Base modules 330a, arranges a reference level; Described base modules 330a comprises the first reference resistance and the first reference capacitance that are arranged in series, and the node that described first reference resistance and the first reference capacitance couple provides reference level.First reference resistance resistance is set to 220 ohm.
Comparison module 340a, compares charged state level and reference level, and exports index signal; Described comparison module 340a is configured to 1BA11 chip, and its 4th pin is connected to reference level, and its 6th pin is connected to charged state level, and its 3rd pin and the first pin are connected to indicating module 350a.
Indicating module 350a, is coupled to comparison module 340a, comprises two light-emitting components, controls the work of one light-emitting component according to index signal state.Described indicating module 350a comprises the first instruction unit and the second instruction unit, and described first instruction unit comprises the first light-emitting diode and the first luminous protective resistance R22 that are arranged in series; Described second instruction unit comprises the second light-emitting diode and the second luminous protective resistance R23 that are arranged in series.First luminous protective resistance R22 is set to 470 ohm, and the second luminous protective resistance R23 resistance is set to 470 ohm.
Describe in detail the second charging circuit with reference to Fig. 6, the second charging circuit includes detection module 310a respectively, is series at the feeder ear of USB interface, and provides a sampled voltage; Detection module 310a comprises the 5th sampling resistor R38 and the first sampling capacitance C17 that are arranged in series, described first sampling capacitance C17 holds between power supply low level with being connected to power line, 5th sampling resistor R38 resistance is set to 50 ohm, because the first charging circuit is different with the second charging circuit power output, so its sample circuit is also distinct to the requirement of precision.First sampling capacitance C17 model is set to JN102M, changes the sampling produced disturb for level between holding with eliminating power supply low level and power line.
Lithium battery protection module 320a, is coupled to detection module 310a, receives sampled voltage and exports charged state level; Described lithium battery protection module 320a is configured to CECL1303 chip.
Also be coupled with the 3rd protective resistance R31 between first pin of described CECL1303 chip and the 4th pin, the 4th of described CECL1303 chip is also coupled with the 4th protective resistance R28 between pin and charging voltage.3rd protective resistance resistance R31 value is set to 100K Europe, and the 4th protective resistance R28 resistance is set to 10K ohm, due to power dissipation.
Base modules 330a, arranges a reference level; Described base modules 330a comprises the first reference resistance R33 and the first reference capacitance C16 that are arranged in series, and the node that described first reference resistance R33 and the first reference capacitance C16 couples provides reference level.First reference resistance R33 resistance is set to 220 ohm.
Comparison module 340a, compares charged state level and reference level, and exports index signal; Described comparison module 340a is configured to 1BA11 chip, and its 4th pin is connected to reference level, and its 6th pin is connected to charged state level, and its 3rd pin and the first pin are connected to indicating module 350a.
Indicating module 350a, is coupled to comparison module 340a, comprises two light-emitting components, controls the work of one light-emitting component according to index signal state.Described indicating module 350a comprises the first instruction unit and the second instruction unit, and described first instruction unit comprises the first light-emitting diode and the first luminous protective resistance R24 that are arranged in series; Described second instruction unit comprises the second light-emitting diode and the second luminous protective resistance R27 that are arranged in series.The resistance of the first luminous protective resistance R24 and the second luminous protective resistance R27 is all set to 470 ohm.
With reference to shown in Fig. 7, lightning protection circuit is described in detail, wiring board circuit 400a is provided with the first lightning protection circuit 410a, first lightning protection circuit 410a comprises the first gas discharge tube GDT1, first lightning protection circuit 410a comprises the first detecting unit 411a and the first detecting unit 412a, first detecting unit 411a is piezo-resistance RV1, and the first detecting unit 412a is piezo-resistance RV2.
The operation principle of piezo-resistance is as follows: when being added in the threshold value of the voltage in piezo-resistance lower than it, the electric current flowing through it is minimum, and it is equivalent to the infinitely-great resistance of resistance.That is, when being added in the voltage above it lower than its threshold value, it is equivalent to the switch of an off-state; When being added in the voltage in piezo-resistance and exceeding its threshold value, the electric current flowing through it increases sharply, and it is equivalent to the infinitesimal resistance of resistance.That is, when being added in the voltage above it higher than its threshold value, it is equivalent to the switch of a closure state.
First detecting unit 411a is coupled to live wire for being detected voltage in real time, and export the first detection signal, first detecting unit 412a is coupled on zero line for being detected voltage in real time, and export the second detection signal, first detecting unit 411a and the first detecting unit 412a is all coupled to the first gas discharge tube GDT1, first gas discharge tube GDT1 in response to the first detection signal or the second detection signal to realize opening and closing, first gas discharge tube GDT1 is two pole discharge tubes, one end of two pole discharge tubes and piezo-resistance RV1, piezo-resistance RV2 connects, other end ground connection, by the first detecting unit 411a, first detecting unit 412a is to live wire, zero line detects in real time, avoid forgetting that the situation causing electrical equipment to damage lightning protection function unlatching occurs.
The operation principle of gas discharge tube is gas discharge, when applied voltage increases above the dielectric strength of gas, the gap of two interpolars is by discharge breakdown, be converted into conduction state by original state of insulation, the voltage after conducting between discharge tube the two poles of the earth maintains the residual voltage level of putting electric arc channel and determining.
By the effect of piezo-resistance RV1 and piezo-resistance RV2, to being struck by lightning, the high voltage produced detects, by piezo-resistance RV1, live wire is detected, and piezo-resistance RV2 detects zero line, if the resistance of piezo-resistance RV1 diminishes, then high voltage live wire existing and is struck by lightning and causes is described; If the resistance of piezo-resistance RV2 diminishes, then high voltage zero line existing and is struck by lightning and causes is described; If the resistance of the resistance of piezo-resistance RV1 and piezo-resistance RV2 all diminishes, then high voltage zero line, live wire all existing and is struck by lightning and causes is described; No matter in which kind of situation above-mentioned, all the electric current of the surge brought of being struck by lightning is flowed into the first gas discharge tube GDT1 and carry out earial drainage.
Wiring board circuit 400a also comprises the second lightning protection circuit 420a, second lightning protection circuit 420a is coupled between the first lightning protection circuit 410a and load, second lightning protection circuit 420a comprises the second gas discharge tube GDT2, the second coil L2, the 3rd gas discharge tube GDT3 and tertiary coil L3, second gas discharge tube GDT2 is series on live wire, second coil L2 is parallel to the second gas discharge tube GDT2,3rd gas discharge tube GDT3 is series on zero line, and tertiary coil L3 is parallel to the 3rd gas discharge tube GDT3.
Because the electric current of the surge brought of being struck by lightning is very large, and can there is the risk increased sharply electric current cannot let out completely in the first lightning protection circuit 410a, so arranging a second lightning protection electric current, do not produced infringement by having let out to electrical equipment to prevent the electric current increased sharply.
Detection control circuit 430a is provided with between first lightning protection circuit 410a and load, detection control circuit 430a is piezo-resistance RV3, one end of detection control circuit 430a is coupled to live wire, the other end is coupled to zero line, detecting unit is used for being detected voltage in real time, and in response to overvoltage with by wiring board circuit 400a short circuit, when the first lightning protection circuit 410a damages due to fault, then earial drainage is not carried out to the electric current increased sharply, thus detect by piezo-resistance RV3 the high voltage that thunderbolt produces, the resistance of piezo-resistance RV3 is diminished, electric current directly flows into zero line from live wire through piezo-resistance RV3, thus by whole wiring board circuit 400a short circuit, avoid causing damage to the load of access wiring board, and when the first lightning protection circuit 410a can normally work, then detection control circuit 430a does not work.
Indicating circuit 440a is provided with between first lightning protection circuit 410a and detection control circuit 430a; indicating circuit 440a comprises protective resistance and indicator light; be coupled between live wire and zero line after protective resistance R9 and indicator light LED strip join; when the first lightning protection circuit 410a normally works; then indicator light LED can normally light; if when the first lightning protection circuit 410a damages, then detection control circuit 430a works and by this wiring board circuit 400a short circuit, simultaneously indicator light LED extinguishes.
First lightning protection circuit 410a, indicating circuit 440a, detection control circuit 430a and the second lightning protection circuit 420a are coupled between live wire and zero line successively.
The above is only preferred implementation of the present utility model, protection range of the present utility model be not only confined to above-described embodiment, and all technical schemes belonged under the utility model thinking all belong to protection range of the present utility model.It should be pointed out that for those skilled in the art, do not departing from the some improvements and modifications under the utility model principle prerequisite, these improvements and modifications also should be considered as protection range of the present utility model.

Claims (10)

1. miniature earth leakage protective socket; comprise jack body; described jack body is provided with some general-purpose jacks and a plug; coupled by a power bus between described plug and general-purpose jack; power bus comprises power firestreak end, zero-power line end and ground-side of power; described power firestreak end and zero-power line end are coupled in an instrument transformer, and described instrument transformer is coupled with leakage protection circuit, it is characterized in that:
Described instrument transformer is coupled with a simulation electric leakage module, and described simulation electric leakage module comprises a manual contact, and when manual contact is pressed, described instrument transformer exports leakage current;
Described leakage protection circuit, comprises sampling module, judge module, Executive Module;
Described sampling module is coupled to the output of instrument transformer, for leakage current of sampling;
Described judge module is coupled to sampling module, when instrument transformer produces leakage current, exports executive signal;
Executive Module is coupled to judge module, when receiving executive signal, jumps disconnected external power source to the power supply of socket.
2. miniature earth leakage protective socket as claimed in claim 1, is characterized in that: described socket is also provided with reset button, for recovering the power supply of external power source to socket.
3. miniature earth leakage protective socket as claimed in claim 1 or 2; it is characterized in that: described jack body is also provided with the different USB interface of some power outputs; described power firestreak end and zero-power line end are coupled with power supply circuits, and described power supply circuits are used for AC conversion to become direct current to USB interface.
4. miniature earth leakage protective socket as claimed in claim 3, is characterized in that: described power supply circuits comprise
Rectification voltage reduction module, the alternating current for inputting external communication carries out rectification step-down and exports a supply power voltage;
Switch power module, comprises an output and and compensates end;
The magnet exciting coil intercoupled, output winding, feedback coil, described magnet exciting coil is coupled to the output of switch power module in order to carry out excitation to output winding; Described output winding is in order to load supplying; Described feedback coil is coupled to the compensation end of switch power module;
The feedback current of the output current size of output winding is followed in described feedback coil sampling one, and described switch power module exports the exciting current of magnet exciting coil to make output current for certain value according to feedback current compensation.
5. miniature earth leakage protective socket as claimed in claim 3; it is characterized in that: between described power supply circuits and each USB interface, be all coupled with charging circuit; described charging circuit detects power consumption equipment charged state, and reminds user's charging complete when power consumption equipment is in Full Power State.
6. miniature earth leakage protective socket as claimed in claim 5, is characterized in that: described charging circuit comprises
Detection module, is series at the feeder ear of USB interface, and provides a sampled voltage;
Lithium battery protection module, is coupled to detection module, receives sampled voltage and exports charged state level;
Base modules, arranges a reference level;
Comparison module, compares charged state level and reference level, and exports index signal;
Indicating module, is coupled to comparison module, comprises two light-emitting components, controls the work of one light-emitting component according to index signal state.
7. miniature earth leakage protective socket as claimed in claim 1 or 2, it is characterized in that: also comprise the first lightning protection circuit, described first lightning protection circuit comprises the first detecting unit and the second detecting unit, described first detecting unit is coupled to power firestreak end for being detected voltage in real time, and export the first detection signal, described second detecting unit is coupled to zero-power line end for being detected voltage in real time, and export the second detection signal, described first detecting unit and the second detecting unit are all coupled to the first gas discharge tube, described first gas discharge tube in response to the first detection signal or the second detection signal to realize opening and closing.
8. miniature earth leakage protective socket as claimed in claim 7, is characterized in that: described first detecting unit and the second detecting unit are piezo-resistance.
9. miniature earth leakage protective socket as claimed in claim 8, is characterized in that: be provided with piezo-resistance between described power firestreak end and zero-power line end.
10. miniature earth leakage protective socket as claimed in claim 9; it is characterized in that: also comprise the second lightning protection circuit; second lightning protection circuit is coupled between the first lightning protection circuit and load; described second lightning protection circuit comprises the second gas discharge tube, the second coil, the 3rd gas discharge tube and tertiary coil; described second gas discharge tube is series at power firestreak end; described second coils from parallel connection of coils is in the second gas discharge tube; described 3rd gas discharge tube is series at zero-power line end, and described tertiary coil is parallel to the 3rd gas discharge tube.
CN201520580658.4U 2015-08-04 2015-08-04 Miniature earth leakage protection socket Expired - Fee Related CN204992157U (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201520580658.4U CN204992157U (en) 2015-08-04 2015-08-04 Miniature earth leakage protection socket

Publications (1)

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CN204992157U true CN204992157U (en) 2016-01-20

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104993332A (en) * 2015-08-04 2015-10-21 温州骋航电器有限公司 Miniature electric leakage protection socket
CN110444963A (en) * 2019-08-23 2019-11-12 佛山市开力电气有限公司 The intelligent protection system of modularization intelligent earth leakage protective socket

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104993332A (en) * 2015-08-04 2015-10-21 温州骋航电器有限公司 Miniature electric leakage protection socket
CN110444963A (en) * 2019-08-23 2019-11-12 佛山市开力电气有限公司 The intelligent protection system of modularization intelligent earth leakage protective socket
CN110444963B (en) * 2019-08-23 2020-09-08 佛山市开力电气有限公司 Intelligent protection system of modularized intelligent leakage protection socket

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