CN201369470Y - Earth-leakage protecting plug - Google Patents

Earth-leakage protecting plug Download PDF

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Publication number
CN201369470Y
CN201369470Y CNU2009201459353U CN200920145935U CN201369470Y CN 201369470 Y CN201369470 Y CN 201369470Y CN U2009201459353 U CNU2009201459353 U CN U2009201459353U CN 200920145935 U CN200920145935 U CN 200920145935U CN 201369470 Y CN201369470 Y CN 201369470Y
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CN
China
Prior art keywords
leakage
ground wire
plug
circuit
earth
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CNU2009201459353U
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Chinese (zh)
Inventor
陈华强
张振功
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陈华强
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Priority to CNU2009201459353U priority Critical patent/CN201369470Y/en
Application granted granted Critical
Publication of CN201369470Y publication Critical patent/CN201369470Y/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model discloses an earth-leakage protecting plug, which comprises an electromagnetic tripping device and an earth-leakage protective circuit, wherein the earth leakage protective circuit consists of an earth wire leakage detecting chip, a phase wire of a power supply is electrically connected on an anode pin of the earth wire leakage detecting chip after voltage of the phase wire is divided by a resistance, and a cathode pin thereof is electrically connected on an earth wire of the power supply, and a collector is connected on the input end of the electromagnetic tripping device. When the earth wire has imperfect earth or is disconnected, the earth wire leakage detecting chip can start the electromagnetic tripping device to cut off the power supply. An earth wire live line detecting device is connected on the earth wire of a power cord, a zero-sequence current protective circuit and a neutral conductor earth protective circuit are further provided, the disjunction can be realized by the electromagnetic tripping device, and three pins in the plug all can simultaneously disconnect with the power supply no matter residual current occurs between the phase wire and a neutral conductor, or the earth wire has the imperfect earth or is disconnected, thereby satisfying the requirements of safety use of electric energy.

Description

Leakage protecting plug
Technical field
The utility model relates to a kind of attaching plug, particularly relates to a kind of leakage protecting plug, is mainly used in electric heater, air-conditioning or movable electric tool, electric hand drill for example, and bathroom hair dryers etc. are for the said equipment provides earth leakage protective.
Background technology
Along with popularizing day by day of industrial production facilities equipment and household electrical appliance, people are more and more with the chance that electrically contacts, and power consumption equipment breaks down and causes the get an electric shock situation of injures and deaths of personnel to happen occasionally.Show that according to interrelated data in national industrial accident, electric accident is up to 37%.For personal safety and device security, earth leakage protective device is widely used as an effective electrical safety technique device, and plays the important and pivotal role.
Based on the earth leakage protective device principle; for the user is protected better; now a lot of products have all disposed leakage protecting plug; when electric leakage takes place in the electric equipment that is connected with leakage protecting plug; leakage protecting plug can be cut off the electricity supply within a few tens of milliseconds automatically; the harm that makes the user avoid getting an electric shock, protection user's life security.Especially be applied to the electric equipment in some following special occasions, in moist especially place (as swimming pool, shower house, kitchen, toilet etc.), because of human epidermal resistance reduces, the danger of getting an electric shock and dying increases greatly (1).(2) when some electronic equipment insulation damages, its metal-ware that exposes (as telescopic antenna of television set, radio-cassette player etc.) may be with dangerous voltage.
But a host of facts prove, even the load fault-free, because of power failure, for example the neutral line, ground wire misconnection, ground wire grounded bad or disconnection, overtension cause that electrical equipment burns etc., also can make electrical equipment shell charged and cause the generation of electric shock accidents.Existing leakage protecting plug can only between phase line, the neutral line, produce residual current and reach set point (for example 10MA) at this residual current thus just can cut off the electricity supply its back loading is protected.Though and the product that has the ground wire faulty indication on the market has the ground wire malfunction indicator lamp to report to the police; but can not cut off the electricity supply; because leakage protecting plug generally all is installed in hidden place, like this, even ground wire has fault also also to can't see the generation that causes electric shock accidents because of the user.
The utility model content
Technical problem to be solved in the utility model is to solve when leakage protecting plug can only have residual current between phase, the neutral line just can cut off the electricity supply, and can not give the problem of power-off protection when ground wire breaks down.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopted provides a kind of leakage protecting plug, and the power line tail end that is connected electric equipment provides the input power supply for this electric equipment, and described leakage protecting plug comprises:
Shell is formed by last lower house fastening;
Phase line, the neutral line and ground wire copper plug, above-mentioned plug plug-in mounting respectively are fixed on the lower house;
Electromagnetic tripping apparatus, be used to cut off described phase line, the neutral line and ground wire copper plug and power line, this electromagnetic tripping apparatus comprises tripping coil and one-way SCR, described tripping coil has first, second two terminals, the anode of one-way SCR is connected electrically on the neutral line copper plug, and negative electrode is connected on first terminals of tripping coil;
Resetting means is provided with in the enclosure and reset button passes the upper surface of upper shell, and described resetting means is used for being communicated with simultaneously again described phase line, the neutral line and ground wire copper plug and power line;
Rectification circuit is used to provide direct-current working volts;
Leakage protection circuit, comprise the zero-sequence current protection circuit, described zero-sequence current protection circuit comprises zero sequence current mutual inductor and amplifying circuit, described zero sequence current mutual inductor is set on phase line, the neutral line and the ground wire, its output is electrically connected to the input of amplifying circuit, and the output of amplifying circuit is electrically connected to the control of one-way SCR and extremely goes up;
Leakage protection circuit also comprises overvoltage crowbar and ground wire leakage protection circuit:
Described overvoltage crowbar comprises first, second divider resistance of two series connection and is connected first diode between two divider resistances, the other end of this first diode is connected to the control of one-way SCR and extremely goes up, the other end of first divider resistance is connected to the cathode output end of rectification circuit, and the other end of second divider resistance is connected to the cathode output end of rectification circuit;
Described ground wire leakage protection circuit comprises the 3rd of series connection, the 4th divider resistance and ground wire detection of electrical leakage chip, the described the 3rd, the other end of the 4th divider resistance is electrically connected to the power supply phase line and the neutral line respectively, the anode pin of described ground wire detection of electrical leakage chip is electrically connected to the 3rd, between the 4th divider resistance, the negative electrode pin is electrically connected to power ground, first emitter and first collector electrode are connected to the two ends of the 4th divider resistance in the overvoltage crowbar, first collector electrode also is connected to the cathode output end of rectification circuit simultaneously through a light-emitting diode, the first emission collection also is connected to second terminals of tripping coil simultaneously;
When ground wire imperfect earth or disconnection, electromagnetic tripping apparatus is cut off the electricity supply thereby first emitter of ground wire detection of electrical leakage chip and first collector cut-off trigger the one-way SCR startup.
On the basis of such scheme, ground wire detection of electrical leakage chip is a photoelectrical coupler.
Further, the utility model also comprises the leakage-current alarm circuit, this leakage-current alarm circuit comprises a loud speaker, and two inputs of described loud speaker also are electrically connected to second emitter and second collector electrode of ground wire detection of electrical leakage chip respectively when connecting the input power supply respectively.
Also comprise the neutral earthing protective circuit, this neutral earthing protective circuit comprises that the neutral line that is arranged on the power supply phase line and the neutral line detects magnet ring, and the current output terminal of this neutral line detection magnet ring is connected to the input of amplifying circuit.
The utility model; be connected with earth wire charged testing device on the power line ground wire; also be provided with zero-sequence current protection circuit and neutral earthing protective circuit; realize disjunction by electromagnetic tripping apparatus; no matter occur residual current between phase, the neutral line and still be ground wire grounded bad or when disconnecting, three plugs in the plug all simultaneously and dump.Not only can prevent the electric shock accidents that causes because of apparatus failure, and can also prevent the electric shock accidents that causes because of the power failure beyond the electrical equipment, thereby satisfy the safety utilization of electric power requirement.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 removes internal structure schematic diagram behind the shell for the utility model;
Fig. 3 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is made detailed explanation.
As shown in Figure 1 and Figure 2; the utility model provides a kind of leakage protecting plug; the power line tail end that is connected electric equipment provides the input power supply for this electric equipment; this leakage protecting plug comprises shell; phase line, the neutral line and ground wire copper plug 11,12,13; leakage protection circuit plate 15, electromagnetic tripping apparatus and resetting means.
Described shell is fastened by upper and lower casing 20,21 and forms;
Described phase line, the neutral line and ground wire copper plug 11,12,13 plug-in mounting respectively are fixed on the lower house 21, and being used to insert corresponding socket provides the input power supply;
Be respectively equipped with on the described leakage protection circuit plate 15 three with the relative contact of phase line, the neutral line and ground wire three utmost point copper plugs 11,12,13, leakage protection circuit plate 15 is fixed on the inner surface of lower house 21 and the contact on the leakage protection circuit plate 15 offsets with the top of copper plug 11,12,13 respectively realizes being electrically connected.Leakage protection circuit plate 15 is provided with three binding posts 5; this binding post 5 connects phase line, the neutral line and the ground wire of power line 30 respectively; three elasticity movable contact spring 6 one ends are fixing respectively and is electrically connected with binding post 5, the other end be provided with the moving contact relative and above-mentioned moving contact with the contact on the leakage protection circuit plate 15 when operate as normal flexibly with leakage protection circuit plate 15 on the contact realization that offsets be electrically connected.
Described resetting means is used for being communicated with again described phase line, the neutral line and ground wire three utmost point copper plug 11,12,13 and power lines 30, this resetting means comprises the U-shaped support 8 that reset button 1, complex displacement motion block 2 and opening make progress, and reset button 1 passes the upper surface of upper shell 20; Support 8 is fixed on the upper surface of leakage protection circuit plate 15, complex displacement motion block 2 is arranged in the U-shaped opening of support 8 and can moves up and down along this U-shaped opening, the upper surface of complex displacement motion block 2 is provided with the C shape open recess that opening makes progress and the bottom surface level of groove, have vertical through hole on the bottom surface of groove, reset button 1 is step-like, its underpart is inserted in the through hole on the complex displacement motion block 2 and is provided with a horizontal groove towards electromagnetic tripping apparatus 4, the middle part of reset button 1 is provided with the convex annular edge, the lower surface of the opening part of the upper surface on this convex annular edge and C shape open recess offsets, be set with back-moving spring 3 on the reset button 1, also be provided with two springs between the bottom surface of the lower surface of the convex edge on the reset button 1 and C shape open recess, be symmetricly set on the both sides of back-moving spring 3 respectively; The lower surface of complex displacement motion block 2 respectively with elasticity movable contact spring 6 on moving contact offset; when pressing reset button 1; when complex displacement motion block 2 moves down in the U-shaped opening of support 8; press down and make moving contact to contact elasticity movable contact spring 6, realize being electrically connected with contact on the leakage protection circuit plate 15.
Described electromagnetic tripping apparatus 4 is fixed on the leakage protection circuit plate 15; be used to cut off described phase line, the neutral line and ground wire three utmost point copper plug 11,12,13 and power lines 30; this electromagnetic tripping apparatus 4 comprises moving iron core 41, tripping coil L1 and locking board 7, and flexibly protruding and external part is provided with an annular groove under the effect of the moving dropout spring of iron core 41 in electromagnetic tripping apparatus.Locking board 7 rectangular bent plate shapes; its vertical board has the U-lag that communicates with end face; the two side of U-lag is installed in the annular groove of moving iron core 41 external parts; because the effect of dropout spring; the front end of locking board 7 horizontal plate parts flexibly is resisted against the bottom of reset button 1; when reset button 1 is pressed to certain depth; the front end of locking board 7 horizontal plate parts extend in the horizontal groove of reset button 1 bottom it is blocked; moving contact on this moment elasticity movable contact spring 6 contacts with the contact on the leakage protection circuit plate 15, realizes being electrically connected.When electromagnetic tripping apparatus 4 work; when being the tripping coil L1 energising of electromagnetic tripping apparatus 4; moving iron core 41 retractions of pulling; so the front end of locking board 7 horizontal plate parts is deviate from from the horizontal groove of reset button 1 bottom; reset button 1 pops up under the effect of back-moving spring; so three elasticity movable contact springs 6 all pop up, the contact separation on moving contact on the elasticity movable contact spring 6 and the leakage protection circuit plate 15, thus realize three copper plugs 11,12 and 13 and the disconnection of power line 30.
Circuit part in the utility model on the leakage protection circuit plate 15 comprises rectification circuit E, trip circuit G, circuit measuring zero phase sequence current A, ground wire leakage protection circuit C, overvoltage crowbar B and warning circuit D, as shown in Figure 3.
Wherein rectification circuit E forms rectifier bridge by D2, D3, D5 and four diodes of D6, for other circuit provide direct-current working volts:
Trip circuit G comprises tripping coil L1 and unidirectional controllable silicon S CR; the control utmost point of unidirectional controllable silicon S CR is connected to the current output terminal of circuit measuring zero phase sequence current A, ground wire leakage protection circuit C and overvoltage crowbar B; anode is connected on the neutral line of power supply; negative electrode is connected on first terminals of tripping coil L1; when above-mentioned three electric circuit inspection arrive power failure or simulated failure; the output trigger current is to unidirectional controllable silicon S CR; so unidirectional controllable silicon S CR becomes conducting by off state, tripping coil L1 energising task driven electromagnetic tripping apparatus is cut off the electricity supply.
Circuit measuring zero phase sequence current A comprises zero sequence current mutual inductor CT1 and the neutral line instrument transformer CT2 that is set on phase line, the neutral line and the ground wire, the output of zero sequence current mutual inductor CT1 and neutral line instrument transformer CT2 is connected to the input of amplifying circuit respectively, and the output of amplifying circuit is electrically connected to the control of unidirectional controllable silicon S CR and extremely goes up; Zero sequence current mutual inductor CT1 is made by permalloy, and the neutral line among the neutral line instrument transformer CT2 detects magnet ring and made by ferrite.Power ground passes zero sequence current mutual inductor CT1 around two circles, whether measure has fault current to occur over the ground, when the phase line fault, electric current output is arranged among the zero sequence current mutual inductor CT1, this output current triggers the one-way SCR conducting after amplifying circuit amplifies, so tripping coil L1 action promotes tripping mechanism K2 and threads off, thereby cuts off the electricity supply.Adopt RV4145 to amplify chip IC 1 in the present embodiment and realize, certainly, those skilled in the art also can adopt other amplifying circuits or amplify chip and realize.Same output current and amplify the control utmost point startup electromagnetic tripping apparatus that triggers one-way SCR in the back through amplifying circuit and cut off the electricity supply when neutral line instrument transformer CT2 detects the zero line fault.
Described overvoltage crowbar B comprises first, second divider resistance R6, the R7 of two series connection and is connected the first diode D4 between two divider resistance R6, the R7 that the other end of this first diode D4 is connected to the control of unidirectional controllable silicon S CR and extremely goes up.The other end of the first divider resistance R6 is connected to the cathode output end of rectification circuit E, and the other end of the second divider resistance R7 is connected to the cathode output end of rectification circuit E.The second divider resistance R7 both end voltage value changes with the change of supply voltage, when supply voltage excessive, when the magnitude of voltage at the second divider resistance R7 two ends exceeds the conducting voltage of the first diode D4, the control utmost point that the second divider resistance R7 outputs current to unidirectional controllable silicon S CR triggers unidirectional controllable silicon S CR conducting, so tripping coil L1 work is cut off the electricity supply.
Ground wire leakage protection circuit in the utility model comprise be cascaded the 3rd; the 4th divider resistance R9; R10 and ground wire detection of electrical leakage chip IC 2; the described the 3rd; the 4th divider resistance R9; the other end of R10 is connected to the power supply phase line and the neutral line respectively; the anode pin 1 of ground wire detection of electrical leakage chip IC 2 is connected to the 3rd; the 4th divider resistance R9; between the R10; negative electrode pin 4 is connected to power ground; first emitter (pin 7) and first collector electrode (pin 8) are connected to the two ends of the second divider resistance R7 among the overvoltage crowbar B, and first collector electrode also is connected to the cathode output end of rectification circuit E simultaneously through a LED 2.Ground wire detection of electrical leakage chip IC 2 is a photoelectrical coupler, and that select for use in the present embodiment is TLP621-2, yet those skilled in the art can select the photoelectrical coupler of its alloytype for use.When ground wire imperfect earth or disconnection, 7,8 pins of ground wire detection of electrical leakage IC2 end, so the electric current on the first divider resistance R9 is added on the first diode D4 through LED 2 and makes its conducting, cut off the electricity supply thereby trigger unidirectional controllable silicon S CR startup electromagnetic tripping apparatus.
Warning circuit comprises a loud speaker, two inputs of this loud speaker connect the input power supply respectively, two of this loud speaker inputs also are electrically connected to second emitter (pin 5) and second collector electrode (pin 6) of ground wire detection of electrical leakage IC2 respectively simultaneously, under normal circumstances, second emitter of ground wire detection of electrical leakage chip IC 2 and the second collector electrode conducting, loud speaker is by short circuit, when ground wire detection of electrical leakage chip IC 2 detects ground wire disconnection or loose contact, second emitter and the second collector electrode pin end, so loud speaker power connection and reporting to the police.
The utlity model has following advantage:
1. no matter the electrical equipment protected of band earth fault leakage protecting plug be to occur residual current or in use ground wire grounded bad or disconnect and all can cut off the electricity supply between phase, the neutral line.
If neutral earthing or body contact cut off the electricity supply.
3. overtension can be cut off the electricity supply, and satisfies the safety utilization of electric power requirement.
4. buzzer warning has been avoided causing electric shock accidents because of can't see faulty indication.
The utility model is not limited to above-mentioned preferred forms, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or close technical scheme, all fall within the protection range of the present utility model.

Claims (4)

1, leakage protecting plug, the power line tail end that is connected electric equipment provides the input power supply for this electric equipment, and described leakage protecting plug comprises:
Shell is formed by last lower house fastening;
Phase line, the neutral line and ground wire copper plug, above-mentioned plug plug-in mounting respectively are fixed on the lower house;
Electromagnetic tripping apparatus, be used to cut off described phase line, the neutral line and ground wire copper plug and power line, this electromagnetic tripping apparatus comprises tripping coil and one-way SCR, described tripping coil has first, second two terminals, the anode of one-way SCR is connected electrically on the neutral line copper plug, and negative electrode is connected on first terminals of tripping coil;
Resetting means is provided with in the enclosure and reset button passes the upper surface of upper shell, and described resetting means is used for being communicated with simultaneously again described phase line, the neutral line and ground wire copper plug and power line;
Rectification circuit is used to provide direct-current working volts;
Leakage protection circuit, comprise the zero-sequence current protection circuit, described zero-sequence current protection circuit comprises zero sequence current mutual inductor and amplifying circuit, described zero sequence current mutual inductor is set on phase line, the neutral line and the ground wire, its output is electrically connected to the input of amplifying circuit, and the output of amplifying circuit is electrically connected to the control of one-way SCR and extremely goes up;
It is characterized in that described leakage protection circuit also comprises overvoltage crowbar and ground wire leakage protection circuit:
Described overvoltage crowbar comprises first, second divider resistance of two series connection and is connected first diode between two divider resistances, the other end of this first diode is connected to the control of one-way SCR and extremely goes up, the other end of first divider resistance is connected to the cathode output end of rectification circuit, and the other end of second divider resistance is connected to the cathode output end of rectification circuit;
Described ground wire leakage protection circuit comprises the 3rd of series connection, the 4th divider resistance and ground wire detection of electrical leakage chip, the described the 3rd, the other end of the 4th divider resistance is electrically connected to the power supply phase line and the neutral line respectively, the anode pin of described ground wire detection of electrical leakage chip is electrically connected to the 3rd, between the 4th divider resistance, the negative electrode pin is electrically connected to power ground, first emitter and first collector electrode are connected to the two ends of the 4th divider resistance in the overvoltage crowbar, first collector electrode also is connected to the cathode output end of rectification circuit simultaneously through a light-emitting diode, the first emission collection also is connected to second terminals of tripping coil simultaneously;
When ground wire imperfect earth or disconnection, electromagnetic tripping apparatus is cut off the electricity supply thereby first emitter of ground wire detection of electrical leakage chip and first collector cut-off trigger the one-way SCR startup.
2, leakage protecting plug as claimed in claim 1 is characterized in that ground wire detection of electrical leakage chip is a photoelectrical coupler.
3, leakage protecting plug as claimed in claim 1 or 2; it is characterized in that also comprising the leakage-current alarm circuit; this leakage-current alarm circuit comprises a loud speaker, and two inputs of described loud speaker also are electrically connected to second emitter and second collector electrode of ground wire detection of electrical leakage chip respectively when connecting the input power supply respectively.
4, leakage protecting plug as claimed in claim 3; it is characterized in that also comprising the neutral earthing protective circuit; this neutral earthing protective circuit comprises that the neutral line that is arranged on the power supply phase line and the neutral line detects magnet ring, and the current output terminal of this neutral line detection magnet ring is connected to the input of amplifying circuit.
CNU2009201459353U 2009-03-23 2009-03-23 Earth-leakage protecting plug Expired - Lifetime CN201369470Y (en)

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Application Number Priority Date Filing Date Title
CNU2009201459353U CN201369470Y (en) 2009-03-23 2009-03-23 Earth-leakage protecting plug

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Application Number Priority Date Filing Date Title
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101794948A (en) * 2010-03-10 2010-08-04 中山市开普电器有限公司 Three-pole disconnected protection plug
CN102290689A (en) * 2011-06-23 2011-12-21 刘睿刚 Earth leakage protection plug
CN102354863A (en) * 2011-06-23 2012-02-15 刘睿刚 Electricity leakage protection plug
CN101847802B (en) * 2009-03-23 2012-05-23 陈华强 Electric leakage protection plug
CN104466554A (en) * 2014-12-24 2015-03-25 常熟市斯佳登电器有限公司 Leakage protection plug
CN107294060A (en) * 2017-07-25 2017-10-24 天津贝罗尼生物科技有限公司 A kind of air purifier earth leakage protective device
CN110703140A (en) * 2013-11-19 2020-01-17 李铉昌 Mobile leakage detection device and method

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101847802B (en) * 2009-03-23 2012-05-23 陈华强 Electric leakage protection plug
CN101794948A (en) * 2010-03-10 2010-08-04 中山市开普电器有限公司 Three-pole disconnected protection plug
CN102290689A (en) * 2011-06-23 2011-12-21 刘睿刚 Earth leakage protection plug
CN102354863A (en) * 2011-06-23 2012-02-15 刘睿刚 Electricity leakage protection plug
CN102290689B (en) * 2011-06-23 2013-02-20 刘睿刚 Earth leakage protection plug
CN102354863B (en) * 2011-06-23 2013-03-27 刘睿刚 Electricity leakage protection plug
CN110703140A (en) * 2013-11-19 2020-01-17 李铉昌 Mobile leakage detection device and method
CN104466554A (en) * 2014-12-24 2015-03-25 常熟市斯佳登电器有限公司 Leakage protection plug
CN107294060A (en) * 2017-07-25 2017-10-24 天津贝罗尼生物科技有限公司 A kind of air purifier earth leakage protective device

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GR01 Patent grant
AV01 Patent right actively abandoned

Granted publication date: 20091223

Effective date of abandoning: 20090323