CN1873873A

CN1873873A - Unit for safeguarding inversed connection in ground fault circuit interrupter

Info

Publication number: CN1873873A
Application number: CN 200510026472
Authority: CN
Inventors: 高云; 郑琴香
Original assignee: SHANGHAI LIYI ELECTRIC CO Ltd
Current assignee: SHANGHAI LIYI ELECTRIC CO Ltd
Priority date: 2005-06-03
Filing date: 2005-06-03
Publication date: 2006-12-06

Abstract

The protector for guiding against reverse connection of ground fault detector is mainly composed of circuit board, tripping resetting device, first pair of static contactor, second pair of static contactor, a pair of mobile contact rack, and control circuit. Characters are that: first pair of static contactor through conducting wire is connected to terminals of input power source; the mobile contact rack through junction device is connected to terminals of socket type load; being installed on lug plates of terminals of load, second pair of static contactor through control circuit makes the tripping resetting device operate so as to connect or disconnect power on loop between mobile contact rack and first/second pair of static contactor. When user connects power line to load end by accident, the detector cannot be reset. Thus, terminals of input power source and terminals of socket type load are not electrified so as to protect electrical appliance from damages, and personal safety.

Description

Unit for safeguarding inversed connection in ground fault circuit interrupter

Technical field

The present invention relates to a kind of reverse connection protector that is used for earth fault protection, relate in particular to a kind of unit for safeguarding inversed connection in ground fault circuit interrupter.

Background technology

For sake of convenience, following ground-fault interrupter replaces with English translated name Ground Fault Circuit Interrupter prefix GFCI.

A large amount of uses along with modern society's electrical equipment; fire and electric shock accidents because of the earth fault initiation take place often; bring harm for personal safety and society; ground-fault interrupter (being designated hereinafter simply as GFCI) is that a kind of person electric shock and earth fault of effectively preventing causes the electrical installation of equipment and fire incident; thereby be subjected to extensive use; and progressively to high-performance; the multifunctional direction development; at present; general ground-fault interrupter does not have backing protection function, therefore, and when installing and use; because carelessness of people; the normal reversal connection line situation that takes place takes place, and promptly power input line is connected to load end, and load line is received power input; make ground-fault interrupter form the reversal connection line states; no matter GFCI is under dropout or the normal condition, top cover of faceplate jack place load end is charged all the time, loses creepage protection function.

Formerly in the technology, many ground-fault interrupters adopt forms such as reversal connection line indicator light, the police of reversal connection report from a liner to remind the wiring and the load end of the correct jockey of user, but this alert view apparatus can't fundamentally be avoided taking place owing to the reversal connection line causes the accident of personal property loss.

In addition; formerly in the technology; Chinese patent; the reverse connection protector of a kind of GFCI is provided in the application number 03121507.6; this device makes electromagnetic releaser mechanism work be switched on or switched off power circuit between first termination and the second and the 3rd termination by control circuit; the stationary contact insulation that utilize to connect the stationary contact of load wiring end and be used to be connected load panel jack place separates, and can not reset when making GFCI reversal connection line and also no power of panel hole, reaches the function of reversal connection line.Wherein, first termination by the wire connecting power input is one and is installed in the action contact frame that has silver contact on the support body that links to each other with armature assembly in the electromagnetic releaser mechanism, and mobile drive first termination by armature is connected with second, third device and disconnects.

In the said mechanism, owing to be subjected to the restriction in space in the device, on the both sides of coil, because silver contact is connected and generation electric arc during disjunction, the high temperature of generation makes coil come to harm easily in the position of adhesive during with disjunction (silver contact contacts/separates) for first termination and second, third termination.In addition, the power supply wiring of first termination is and is connected by power input and through the conductor that detects magnet ring and neutral magnet ring that therefore, the charged area among the GFCI when not working is bigger, easily causes creepage phenomenon.In addition, in first termination, the processing technology that is connected with power line as action contact frame is complicated.

Summary of the invention

For the deficiency of the reverse connection protector that overcomes the earth fault protection in the above-mentioned technology formerly, the invention provides a kind of processing, more convenient, serviceability unit for safeguarding inversed connection in ground fault circuit interrupter more reliably is installed.

To achieve these goals; the technical scheme that its technical problem that solves the utility model adopts is; a kind of unit for safeguarding inversed connection in ground fault circuit interrupter; mainly comprise: circuit board (50), drop-away reset mechanism, first pair of static contact (63A, 63B), second pair of static contact (73A, 73B), a pair of action contact frame (90A, 90B) and control circuit are characterized in:

Described first pair of static contact (63A, 63B) is installed in the described drop-away reset mechanism, and each static contact can be connected to power supply input wires device place;

Described second pair of static contact (73A, 73B) is installed in the described drop-away reset mechanism, and each static contact can be connected to load wiring device place;

Described a pair of action contact frame (90A, 90B) is installed in the described drop-away reset mechanism, and each action contact frame can be connected to female type load wiring device place, source current can be transferred to simultaneously described load wiring device place and female type load wiring device place;

Described drop-away reset mechanism is installed on the circuit board (50), it is the described action contact frame of control (90A, 90B) and described first pair of static contact (63A, 63B) and described second pair of static contact (73A, 73B) on/off, the actuator that also can keep this on-state and off-state simultaneously, comprising:

Can be in the primary importance that realizes described connection and realize the bearing support (113) that moves between the second place of described disconnection, described a pair of action contact frame (90A, 90B) is installed on the described bearing support (113), described action contact frame (90A, 90B) flexibly is connected on the described bearing support (113), for described bearing support (113) provides the return unit (114) of confining force and the dropout spring (123) of confining force is provided in the second place in primary importance.

Described control circuit comprises a reset control circuit, described reset control circuit comprises a reset switch, described reset control circuit is to control described drop-away reset mechanism by described reset switch to carry out the control circuit that resets, and its working power is by described power input supply.

Described each action contact frame has a pair of silver contact at least, each static contact of described first pair of static contact and described second pair of static contact has a silver contact at least, and described action contact frame contacts by described silver contact and to realize described connection respectively with between described first pair of static contact and the described second pair of static contact.

Described action contact frame has chute, chute is buckled in relative fixed on the elliptical shaped lobes of described bearing support groove, simultaneously, between described action contact frame and described bearing support, little spring is installed, described action contact frame is under the effect of described little spring spring force, the slide relative of the elliptical shaped lobes by described action contact frame chute and described bearing support groove realizes that described action contact frame is connected with the elasticity of described bearing support.

Described drop-away reset mechanism also comprises the resetting coil skeleton (110) that is wound with resetting coil (112), be installed in the described resetting coil skeleton (110) and the armature that resets (112) that links to each other with described bearing support (113), magnetic loop cover (100), be wound with the framework of trip coil (120) of tripping coil (121), be installed in back-moving spring (115) and the dropout armature (122) that links to each other with described return unit (114) in the described framework of trip coil (120), described resetting coil skeleton and described magnetic loop cover are installed on the circuit board (50) with the contact pin level, described dropout spring (123) is installed between described bearing support and the magnetic loop cover, described framework of trip coil vertically is installed on the described resetting coil skeleton, and pass the resetting coil skeletal fixation on circuit board with contact pin, when described resetting coil is switched on, the described armature drive bearing support that resets overcomes the dropout spring force under the effect of electromagnetic force effect makes bearing support move to primary importance, simultaneously, return unit hurtles down under the effect of the restoring force of back-moving spring and stops retreating of bearing support, make bearing support remain on primary importance, when tripping coil is switched on, described dropout armature drives return unit and overcomes the elastic force of back-moving spring with return unit lifting and release bearing support under the effect of electromagnetic force, bearing support is moved to the described second place in the effect of dropout spring restoring force, utilizes the elastic force of described dropout spring to make bearing support remain on the second place.

Described resetting coil skeleton one end has a reference test bar jack, in the both sides of reference test bar jack a pin holes is arranged respectively, two return unit blocks are arranged above the outside of reference test bar jack, there are two guide posts in the outside of reference test bar jack, described bearing support one end is a cuboid, partly there is a dropout spring socket at described cuboid center towards magnetic loop cover, respectively there is a guide through hole on dropout spring socket both sides, two movable contact spring sockets are side by side respectively arranged in the both sides of two pilot holes, one block reset spare block is arranged on the top of cuboid, the top and bottom of cuboid both sides have groove, an oval-shaped projection is respectively arranged in the middle of the groove, the center of one end of described magnetic loop cover has the dropout spring socket, a pilot hole seat is respectively arranged on its both sides, in the outside of two pilot hole seats a slot that is used to install first termination is arranged respectively, the guide post of described resetting coil skeleton passes in the pilot hole seat that described bearing support guide through hole is installed in described magnetic loop cover, described bearing support can freely move around between described resetting coil skeleton and described magnetic loop cover, described dropout spring one end is placed in the dropout spring socket of bearing support, and an end is positioned in the dropout spring socket of magnetic loop cover.

Described first pair of static contact is installed in the slot of described magnetic loop cover, the upper end connects with lead, after described lead passes the aperture of described magnetic loop cover centre bore and described circuit board, below circuit board, be connected to the lug plate in the power supply input wires device, realize being connected of first pair of static contact and power supply input wires device, each static contact of second pair of static contact is directly connected on the lug plate of load wiring device, realize being connected of second pair of static contact and load wiring device, each action contact frame is connected to female type load wiring device place by a jockey, and the realization action contact frame is connected with female type load wiring device.

Described each jockey comprises that a lead is connected copper spare with one, one end of described lead links to each other with described action contact frame, the other end links to each other with a described end that is connected copper spare, the other end of described connection copper spare is connected with lug plate in the female type load wiring device, realizes being connected of each action contact frame and female type load wiring end.

Described reset control circuit comprises resistance R 3, reset switch, capacitor C 2, resistance R 4, capacitor C 3, controllable silicon SCR 1, wherein, resistance R 3, reset switch, capacitor C 2 are connected to form a charging paths successively and are in normally off, resistance R 4, capacitor C 3 are connected to form the triggering branch road with the control utmost point of controllable silicon SCR 1, described silicon controlled anode links to each other with described resetting coil, charging paths is in normally open with the triggering branch road, the control reset switch makes described capacitor C 2 be connected with the triggering branch road, utilizes the discharge of capacitor C 2 to give silicon controlled trigger signal.

Described reset control circuit also can be to comprise resistance R 3, reset switch, capacitor C 2, resistance R 4, capacitor C 3, controllable silicon SCR 1, wherein, resistance R 3, reset switch, capacitor C 2 is connected to form a charging paths successively, resistance R 3 is in normally open with reset switch, reset switch, resistance R 4, capacitor C 3 is connected to form the triggering branch road and is in normally off with the control utmost point of controllable silicon SCR 1, described silicon controlled anode links to each other with described resetting coil, charging paths is in normally open with the triggering branch road, control reset switch and resistance R 3 are connected and are made described capacitor C 2 chargings, reset switch is disconnected with the connection of triggering branch road and with resistance R 3 rapidly, utilize the discharge of capacitor C 2 to give controllable silicon SCR 1 triggering signal.

Described reset switch comprises that one is often opened that copper touches part, a normally closed copper touches part and a trace, Chang Kaitong touch part be installed in described circuit board above, one end is connected with circuit board, normally closed copper touch part be installed in described circuit board below, one end is connected with circuit board, the normally closed copper that is connected with circuit board touches an end of part and a end that Chang Kaitong touches part is formed a common port, normally closed copper touches the other end of part and the other end that Chang Kaitong touches part is fixed with two ends of passing the trace of described circuit board respectively, and normally closed copper touches part and described charging paths is in normally off.

Described reset switch also can be one to have common pin, often drives the sensitive switch of pin and normally closed pin.

Described unit for safeguarding inversed connection in ground fault circuit interrupter also comprises the reset circuit controlling organization, described reset circuit controlling organization has back-moving spring, release link, described release link one end contacts with described reset button, the other end is partly installed in the release link jack of magnetic loop cover and is contacted with described reset switch, and described reset button acts on release link makes described reset switch and described reset control circuit carry out break-make;

Described unit for safeguarding inversed connection in ground fault circuit interrupter also comprises leak(age) test circuit controlling organization; described leak(age) test circuit controlling organization comprises reference test bar; the test copper sheet; little spring; one end of described reference test bar contacts with described leak(age) test button; the other end partly is installed in the reference test bar jack of described resetting coil skeleton and contacts with the little spring that passes described circuit board; the test copper sheet is installed in an end of reference test bar; described reference test bar is under the effect of described leak(age) test button and overcome the elastic force of little spring; test copper sheet and test circuit are connected detect the dropout service behaviour of described drop-away reset mechanism, leak(age) test circuit controlling organization and leak(age) test circuit are normally open.

Described unit for safeguarding inversed connection in ground fault circuit interrupter also comprises leak(age) test circuit controlling organization; described leak(age) test circuit controlling organization has reference test bar, touch-switch; one end of described reference test bar contacts with the leak(age) test button; the other end contacts with touch-switch in being installed in described circuit board; described touch-switch and leak(age) test circuit are in normal off and open state, and described leak(age) test button acts on that described reference test bar makes the closed conducting leak(age) test circuit working of touch-switch and the dropout service behaviour that detects described drop-away reset mechanism.

Description of drawings

Fig. 1 is to use the GFCI stereo appearance figure of reverse connecting protection device of the present invention

Rigging position figure when Fig. 2 is to use the GFCI of reverse connecting protection device of the present invention to be in reset mode

Fig. 3 is the drop-away reset mechanism exploded view of reverse connecting protection device of the present invention

Fig. 4 is the exploded view of the GFCI of reverse connecting protection device of the present invention

Fig. 5 is the rigging position figure of drop-away reset mechanism

Fig. 6 is to use the GFCI of reverse connecting protection device of the present invention to be in the profile of trip status

Fig. 7 is to use the GFCI of reverse connecting protection device of the present invention to be in the profile of reset mode

Fig. 8 is to use the circuit theory diagrams of the GFCI of reverse connecting protection device of the present invention

Embodiment

Fig. 1 is to use the GFCI stereo appearance figure of reverse connecting protection device of the present invention.This GFCI comprises the housing that loam cake 10, center 20, base 30 are formed, ground strip 40 is installed between loam cake 10 and the center 20, be equipped with leak(age) test button 130, reset button 140, supply hub 12, earth jack 11, indicator lamp holder 13 on the loam cake 10, be equipped with input terminal screw 61A and load end wiring screw 71A between center 20 and the base 30, grounded bracket 40 is equipped with earthing screw 41.

This outside drawing is the GFCI outside drawing of electric current 20A; reverse connection protector of the present invention also can use on the GFCI of other types; and the GFCI of these types has tape light and two kinds of structures of tape light not; its operation principle all is the same; for brevity; here only explanation uses reverse connection protector of the present invention and electric current to have the GFCI of indicator light as 20A, other just do not explain in addition.

Fig. 2 has demonstrated the whole GFCI that uses reverse connecting protection device of the present invention to concern in each parts position of reset mode.Each parts mainly is to be fixed by loam cake 10, center 20, base 30 and grounded bracket 40.

Reverse connecting protection device of the present invention provides drop-away reset mechanism, wherein resetting coil skeleton 110 is placed in horizontal direction, be positioned on the circuit board 50 by two wiring pin, resetting coil 111 is on resetting coil skeleton 110, armature 112 and be injected into the end of bearing support 113 of one in the endoporus of resetting coil skeleton 110 with the armature heat that resets resets, one end of dropout spring 123 is installed in the hole seat of bearing support 113 support bodys one end, and the other end is installed in the hole seat on the magnetic loop cover 100; 110 one-tenth vertical direction of framework of trip coil 120 and resetting coil skeleton are placed, tripping coil 121 is on framework of trip coil 120, back-moving spring 115 is injected in the return unit 114 of one at dropout armature 122 and with dropout armature heat, and stretch in the endoporus of framework of trip coil 120, in the groove that the block that is stuck in resetting coil skeleton 110 of return unit 114 and bearing support 113 blocks form, stop the travelling backwards of bearing support 113; Magnetic loop cover 100 also is to be positioned in horizontal direction on the circuit board 50, be separated with insulating barrier 102 in the middle of magnetic test coil 101 that is mounted in it and the neutral misconnection ground protection coil 103, neutral misconnection ground protection coil 103 and the circuit board 50 middle insulating barriers 104 that are separated with, the lead 64A, the 64B that insert from power input pass from lower to upper from the magnetic loop cover centre bore; Leak(age) test button 130 is installed in the loam cake, its inner end is embedded in an end of little spring 131, the other end of little spring 131 is supported on the grounded bracket 40, the upper end of the reference test bar 121 of build-in-test copper spare 133 and the following end in contact of leak(age) test button 130, the lower end of reference test bar 121 contacts with little spring 134, and little spring 134 is installed on the base 30; Reset button 140 is installed in the loam cake, its inner end is embedded in an end of little spring 141, the other end of little spring 141 is supported on the grounded bracket 40, the following end in contact of the upper end of release link 142 and reset button 140, the lower end of release link 142 and Chang Kaitong touch an end in contact of part 143, the other end that Chang Kaitong touches part 145 is connected with circuit board 50, the end that normally closed copper touches part 145 be installed in described circuit board 50 below, normally closed copper touches the other end of part 145 and the other end that Chang Kaitong touches part 143 is fixed with two ends of passing the trace 144 of described circuit board 50 respectively, one end of trace 144 contacts with little spring 144, and little spring 144 is installed on the base 30; Like this, make tripping coil 121 energisings by control leakage tests button 130, the electromagnetism masterpiece that produces during by tripping coil 121 energisings drives dropout armature 122 and overcomes the elastic force of back-moving spring 115 and the frictional force between return unit 114 and the groove etc., dropout armature 122 drives return unit 114 and moves upward, in groove, pull out, discharge bearing support 113, move, be in the second place at the restoring force effect lower supporting frame 113 of dropout spring 115; Make resetting coil 112 energisings by control reset button 140, the electromagnetism masterpiece that produces during by resetting coil 112 energising drives and resets armature 111 and overcome the elastic force of dropout spring 123, bearing support 113 is moved, return unit 114 moves downward under the restoring force effect of back-moving spring 115, in the insertion groove, stop bearing support 113, be in primary importance.

Fig. 3 is the exploded view of drop-away reset mechanism.As shown in the figure, drop-away reset mechanism comprises: resetting coil skeleton 110, resetting coil 111, armature 112 resets, bearing support 113, dropout spring 123, magnetic loop cover 100, framework of trip coil 120, tripping coil 121, back-moving spring 115, dropout armature 122, return unit 114, be used to provide the little spring 92 of certain contact stress, one has silver contact 93A-1, the left action contact frame 90A of 93A-2 and one have silver contact 93B-1, the right action contact frame 90B of 93B-2, a pair of being installed in has a silver contact 65A on the described magnetic loop cover, first couple of static contact 63A of 65B, 63B, all action contact frame 90A, the upper and lower surface of 90B has all been opened corresponding chute and has been prevented to be installed on the bearing support 113 back and come off owing to the influence of little spring 92 elastic force.Because the bearing support 113 and the armature 112 that resets are that heat is injection-moulded in together, thereby, when the armature 112 of resetting stressed when mobile, can drive bearing support 113, bearing support 113 drives action contact frame 90A, 90B moves, simultaneously, return unit 114 falls to having stopped that bearing support 113 moves to the origin-location under the effect of the restoring force of back-moving spring 115, make bearing support 113 remain on primary importance, and because return unit 114 and dropout armature 122 are that heat is injection-moulded in together, thereby, when dropout armature 122 stressed when mobile, the elastic force that overcomes back-moving spring 115 drives return unit 114 and moves up, and discharges bearing support 113, and bearing support 113 moves quickly into the second place under the effect of the restoring force of dropout spring 123, and rely on the elastic force of dropout spring 123 to make bearing support 113 remain on the second place, thereby realize that GFCI is closed and the action of threading off.

Fig. 4 is to use the exploded view of the whole GFCI of reverse connection protector of the present invention.As shown in the figure, whole GFCI mainly is made up of loam cake 10, center 20, base 30, the grounded bracket 40 that has grounding base copper sheet 42A, 42B and earthing screw 41, second couple of static contact 70A, 70B having silver contact 73A, 73B, first couple of

static contact

63A, 63B having

silver contact

65A, 65B, socket electric-conductor 80A, 80B, drop-away reset mechanism, reset circuit controlling organization, leak(age) test circuit controlling organization and the control circuit that has a lug plate.

Wherein resetting device mainly comprises: reset button 140, back-moving spring 141, release link 142, little spring 146, the lower end of described release link 142 is touched part 143 with the Chang Kaitong of reset switch and is contacted, the upper end of little spring 146 is touched part 145 with the normally closed copper of reset switch and is contacted, press elastic force that reset button 140 makes release link 142 overcome little spring 146 and make Chang Kaitong touch part 143 to connect reset circuits and make normally closed copper touch part 145 simultaneously to disconnect, come automatically controlled drop-away reset mechanism to carry out homing action with reset circuit; The leak(age) test controlling organization mainly comprises: coil 103, insulating trip 104 are protected in the reference test bar 132 of leak(age) test button 130, spring 131, built-in testing copper sheet 133, the little spring 134, magnetic loop cover 100, magnetic test coil 101, insulating trip 102, the neutral misconnection ground that make reference test bar and leak(age) test circuit be in normally open; In addition, also comprise power supply wiring sheet 60A, 60B, tension disc 62A, 62B, power

supply wiring screw

61A, 61B, circuit board 50, load wiring sheet 70A, 70B, tension disc 72A, 72B, load wiring screw 71A, 71B, the reverse side of the pin soldered circuit board of load wiring sheet 70A, 70B, a pair of

static contact

63A, 63B in the power supply input unit are connected with

lead

64A, 64B,

lead

64A, 64B pass the centre bore of magnetic loop cover 100 and the hole on the circuit board 50 at the reverse side of circuit board with power supply wiring sheet and circuit board 50 solid weldings.All parts utilize four trip bolts 150 fastening after pressing diagramatic way and position assembling.

Described reset switch comprises that often opening copper for one touches part 143, a normally closed copper touches part 145 and a trace 144, Chang Kaitong touch part 145 be installed in described circuit board 50 above, one end is connected with circuit board 50, normally closed copper touch part 145 be installed in described circuit board 50 below, one end is connected with circuit board 50, the normally closed copper that is connected with circuit board 50 touches an end of part 145 and a end that Chang Kaitong touches part 143 is formed a common port, normally closed copper touches the other end of part 145 and the other end that Chang Kaitong touches part 143 is fixed with two ends of passing the trace 144 of described circuit board 50 respectively, and normally closed copper touches part 145 and is in normally off with described reset circuit.

Fig. 5 is the rigging position figure of drop-away reset mechanism, circuit board 50 is installed on the base 30, lug plate 60A in the power supply input wires device, lug plate 70A in 60B and a pair of load wiring device, 70B is installed on the circuit board 50, and be stuck in the draw-in groove of base 30 and center 20,

terminal screw

61A, 61B, 71A, 71B passes lug plate with tension disc 62A, 62B, 72A, 72B is fastened on lug plate 60A separately, 60B, 70A, on the 70B, be wound with the resetting coil skeleton 110 of resetting coil 111, bearing support 113 is connected successively with magnetic loop cover 100, the lower end of framework of trip coil 120 is installed on the resetting coil skeleton 110, the lower end of reference test bar 132 is inserted in the reference test bar jack in the resetting coil skeleton 110, the lower end of release link 142 is inserted in the release link jack of magnetic loop cover 100, action contact frame 90A, 90B is installed on the bearing support, use lead 64A, lug plate 60A in 64B and the power supply input wires device, first couple of static contact 63A that 60B connects, 63B is installed on the magnetic loop cover, with the lug plate 70A in the load wiring device, second couple of static contact 73A that 70B connects, direct and the load end wiring sheet 70A of 73B, 70B links to each other, action contact frame 90A, have silver contact 93A-1 on the 90B respectively, 93A-2,93B-1,93B-2, first couple of

static contact

63A, 63B has silver contact 65A respectively, 65B, second couple of static contact 73A, 73B has silver contact 74A respectively, 74B, action contact frame 90A, 90 and first couples of

static contact

63A, 63B, second couple of static contact 73A, 73B connects by described silver contact.

Fig. 6, Fig. 7 are to use the GFCI of reverse connection protector of the present invention to be in the part sectioned view of dropout and reset mode

When being subjected to the leak(age) test button, described reference test bar 132 does the time spent, overcome the elastic force of little spring 134, test copper sheet 133 on the reference test bar 132 is connected with the leak(age) test circuit, tripping coil 121 on the framework of trip coil 120 gets electric generation electromagnetic force, making the dropout iron core 122 that is injection-moulded in return unit 114 overcome return unit 114 moves up under the elastic force effect of the frictional force of the groove that block on bearing support 113 blocks and the resetting coil skeleton 110 forms and back-moving spring 115, return unit 114 is shifted out from described groove, discharge bearing support 113, bearing support 113 moves quickly into the second place under the effect of the restoring force of dropout spring 123, the elastic force of dropout spring 123 makes bearing support remain on the second place; When being subjected to reset button, described release link 142 does the time spent, overcome the elastic force of back-moving spring 146, make the Chang Kaitong on the reset switch touch part 143 and reset circuit connection, resetting coil 111 on the resetting coil skeleton 110 gets electric generation electromagnetic force, the elastic force that the iron core 112 that resets that drive is injection-moulded in bearing support 113 overcomes dropout spring 123 moves quickly into primary importance, simultaneously, return unit 114 is moved down under the effect of the restoring force of back-moving spring 115 in the groove that block forms on bearing support 113 blocks and the resetting coil skeleton 110, makes bearing support remain on primary importance.

Described primary importance, being that described bearing support moves to and makes movable contact silver point and stationary contact silver point position contacting, also is above-mentioned described reset position state, the described second place, be that described balancing stand moves to the position that makes movable contact silver point and the disjunction of stationary contact silver point, dropout location status.

Fig. 8 is to use the circuit theory diagrams of the GFCI of reverse connecting protection device of the present invention.Wherein D1-D4 is a bridge rectifier, the alternating current of input is transformed into the pulse direct current of output.D1, D2 junction and D3, D4 junction constitute ac input end and are connected with the power end (Line) of GFCI.D1, D4 junction be the negative terminal of DC power supply for this reason, claim in the narration afterwards " ", D2, D3 junction are the anode of DC power supply, and R2 is connected with dropping resistor, and resistance R 2 other ends are connected with the positive pole of filter capacitor C1, and capacitor C 1 other end is connected with ground.The voltage at capacitor C 1 two ends is about 26V, and this voltage is the DC power supply of electronic circuit.

Reset switch RESET, resistance R 3, capacitor C 2, resistance R 4, capacitor C 3, controllable silicon SCR 1, resetting coil J2, disconnect K etc. constitute a reset control circuit; The end of wherein said reset switch RESET links to each other with C2, the other end of reset switch RESET can link to each other with R3 or R4 one end, resistance R 3, reset switch, capacitor C 2 are connected to form a charging paths successively and are in normally off, the other end of R4 extremely links to each other with the control of C3, controllable silicon SCR 1, resistance R 4, capacitor C 3 are connected to form the triggering branch road with the silicon controlled control utmost point, charging paths is in normally open with the triggering branch road, at C3 in parallel with R4 of control utmost point serial connection of controllable silicon SCR 1, this electric capacity plays anti-interference effect; The negative electrode of controllable silicon SCR 1, R4, C3 link to each other with D1, D4, and resetting coil J1 one end links to each other with the GFCI power end, and the other end links to each other with the anode of controllable silicon SCR 1.Disconnect K one end is connected with power end Line, and the other end is connected with load end Load, and the contact that this disconnect is connected with power end is the GFCI movable contact and contacts silver point, and the contact that is connected with load end is the GFCI stationary contact and contacts silver point; The power supply of control circuit links to each other with the power end of GFCI, and when GFCI was charged, the GFCI control circuit was simultaneously charged, DC power supply is by capacitor C 2 chargings, when reset switch was switched on, promptly an end of switch and R3 disconnected and when contact with resistance R 4, capacitor C 2 begins to discharge, produce a triggering signal at R4, this signal makes controllable silicon SCR 1 conducting, and resetting coil J1 is by electric current, and resetting coil J1 can produce an electromagnetic force and act on armature, cause disconnect K closure, promptly GFCI is in reset mode.

Above-mentioned reset control circuit also can be following a kind of situation, the end of wherein said reset switch RESET links to each other with C2, the other end of reset switch RESET can link to each other with R3 or R4 one end, resistance R 3, reset switch, capacitor C 2 is connected to form a charging paths successively, resistance R 3 is in normally open with reset switch, reset switch, resistance R 4, capacitor C 3 is connected to form the triggering branch road and is in normally off with the control utmost point of controllable silicon SCR 1, the anode of described controllable silicon SCR 1 links to each other with described resetting coil, charging paths is in normally open with the triggering branch road, control reset switch and resistance R 3 are connected and are made described capacitor C 2 chargings, reset switch is disconnected with the connection of triggering branch road and with resistance R 3 rapidly, utilize the discharge of capacitor C 2 to give controllable silicon SCR 1 triggering signal.

Pass the output shunt capacitance C8 of the magnetic test coil N1 of two power lines simultaneously, one end series capacitance C7, the other end of C7 is connected in series with resistance R 6, the other end of R6 is connected with input 1 pin of IC, and input 3 pin of the other end of magnetic test coil N1 and IC connect and compose transformer coupled differential input circuit.Wherein, R5 is a feedback resistance, and the one end is connected with IC pin 1, and the other end is connected with IC output 7 pin, and the resistance size of R5 determines the multiplication factor of IC, promptly determines the size of GFCI dropout action failure current value.

The output shunt capacitance C5, the C6 that pass the neutral misconnection ground protection coil N2 of two power lines simultaneously constitute a neutral misconnection ground protective circuit; neutral misconnection ground protection coil N2 two ends in parallel with capacitor C 5; the one end is connected with C6; other end ground connection, capacitor C 6 other ends be connected with output 7 pin of IC.Neutral misconnection ground protection constitutes the sine-wave oscillator that transformer coupled frequency of oscillation is about 5KHz by N1, N2, when neutral misconnection ground phenomenon takes place, and this oscillator starting of oscillation; when amplitude reaches the IC threshold value; the 5 pin output triggering signal of IC, the tripping mechanism action, GFCI disconnects.

Tripping coil J2, controllable silicon SCR 2, capacitor C 4 etc. constitute a dropout control circuit.Wherein, the end of tripping coil J2 is connected with the power end (Line) of GFCI, the other end is connected with the anode of controllable silicon SCR 2, the trigger electrode of controllable silicon SCR 2 is connected with IC triggering signal output 5 pin, controllable silicon SCR 2 minus earths, anti-interference capacitor C4 in parallel between the trigger electrode of controllable silicon SCR 2 and ground, magnetic test coil N1 detect always two power lines by electric current vector and, at ordinary times during the fault-free electric current, this vector is zero, when fault current, and this vector and non-vanishing, when fault current increases to the 5mA left and right sides, the voltage signal of magnetic test coil secondary about can induction place 10mV, this signal amplifies through IC, reaches the threshold values (this threshold values is determined by resistance R 5) of setting, the 5 pin output triggering signal of IC, make controllable silicon SCR 2 conductings, tripping coil J2 is charged, and tripping mechanism is threaded off at the appointed time, movable contact silver point and the disjunction of stationary contact silver point, GFCI disconnects.

Leak(age) test button (TEST), test resistance R1 constitute a leak(age) test circuit, wherein, test resistance R1 is connected with power end, and the leak(age) test button (TEST) of test resistance R1 connects, and the leak(age) test button other end is connected with the other end of load (Load).The leak(age) test circuit is the fault current that 8mA is provided to GFCI, makes regular check on the service behaviour of GFCI, maintains a good state.

Integrated IC amplifying circuit is GFCI application-specific integrated circuit (ASIC) RV4145.

At power end piezo-resistance MOV in parallel, when high voltage occurring suddenly in the circuit, for example be struck by lightning etc., but piezo-resistance transient absorption high voltage, thus the operation element in the protective circuit.

GFCI can be set simultaneously connect indicating circuit, the connection indicating circuit is as follows: LED one end in the circuit is connected with an end of load end (Load), the other end is connected with current-limiting resistance R7 one end, the R7 other end is connected with the other end of load end, when the GFCI conducting, light-emitting diode is shinny.

When the reversal connection line, be that power supply is connected on the load end (Load), like this before disconnect K does not have closure, because first couple of static contact (63A, 63B) with second couple of static contact (73A of D, 73B) all independently separate, and they and action contact frame (90A, 90B) also isolate, so even the load end place has power supply, can not be delivered to panel jack place and " load end " (input when being normal wiring), control circuit is uncharged like this, have because this GFCI adopts electric-controlled type to reset, owing to when reset circuit is not charged, just can not make the resetting coil energising.That is to say in this case; resetting coil can not produce a corresponding electromagnetic force and act on the armature that resets, so the power end of GFCI (Line) and jack all can not switch on, as is provided with indicating circuit; light-emitting diode does not work yet, thereby reaches backing protection function.

Reverse connection protector provided by the present invention adopts drop-away reset mechanism and automatically controlled mode to control and resets has advantages such as dropout is rapid, easy to operate, rational in infrastructure, easy for installation; and the mode by first pair of static contact, the second pair of static contact and action contact frame insulation separate, the power input that has connected by screw when having guaranteed the reversal connection line is not charged and not charged by the load while of panel jack connection yet.

Claims

1. unit for safeguarding inversed connection in ground fault circuit interrupter; mainly comprise: circuit board (50), drop-away reset mechanism, first pair of static contact (63A, 63B), second pair of static contact (73A, 73B), a pair of action contact frame (90A, 90B) and control circuit is characterized in that:

2, unit for safeguarding inversed connection in ground fault circuit interrupter as claimed in claim 1 is characterized in that:

3, unit for safeguarding inversed connection in ground fault circuit interrupter as claimed in claim 2 is characterized in that:

4, unit for safeguarding inversed connection in ground fault circuit interrupter as claimed in claim 1 is characterized in that:

5, unit for safeguarding inversed connection in ground fault circuit interrupter as claimed in claim 4 is characterized in that:

6, unit for safeguarding inversed connection in ground fault circuit interrupter as claimed in claim 1 is characterized in that:

7, unit for safeguarding inversed connection in ground fault circuit interrupter as claimed in claim 6 is characterized in that:

8, unit for safeguarding inversed connection in ground fault circuit interrupter as claimed in claim 1 is characterized in that:

9, unit for safeguarding inversed connection in ground fault circuit interrupter as claimed in claim 1 is characterized in that:

Described reset control circuit comprises resistance R 3, reset switch, capacitor C 2, resistance R 4, capacitor C 3, controllable silicon SCR 1, wherein, resistance R 3, reset switch, capacitor C 2 is connected to form a charging paths successively, resistance R 3 is in normally open with reset switch, reset switch, resistance R 4, capacitor C 3 is connected to form the triggering branch road and is in normally off with the control utmost point of controllable silicon SCR 1, described silicon controlled anode links to each other with described resetting coil, charging paths is in normally open with the triggering branch road, control reset switch and resistance R 3 are connected and are made described capacitor C 2 chargings, reset switch is disconnected with the connection of triggering branch road and with resistance R 3 rapidly, utilize the discharge of capacitor C 2 to give controllable silicon SCR 1 triggering signal.

10, as claim 1 or 8 or 9 described unit for safeguarding inversed connection in ground fault circuit interrupter, it is characterized in that:

11, as claim 1 or 8 or 9 described unit for safeguarding inversed connection in ground fault circuit interrupter, it is characterized in that:

12, unit for safeguarding inversed connection in ground fault circuit interrupter as claimed in claim 1, it is characterized in that also comprising the reset circuit controlling organization, described reset circuit controlling organization has back-moving spring, release link, described release link one end contacts with described reset button, the other end is partly installed in the release link jack of magnetic loop cover and is contacted with described reset switch, and described reset button acts on release link makes described reset switch and described reset control circuit carry out break-make;

13; unit for safeguarding inversed connection in ground fault circuit interrupter as claimed in claim 1; it is characterized in that also comprising leak(age) test circuit controlling organization; described leak(age) test circuit controlling organization comprises reference test bar; the test copper sheet; little spring; one end of described reference test bar contacts with described leak(age) test button; the other end partly is installed in the reference test bar jack of described resetting coil skeleton and contacts with the little spring that passes described circuit board; the test copper sheet is installed in an end of reference test bar; described reference test bar is under the effect of described leak(age) test button and overcome the elastic force of little spring; test copper sheet and test circuit are connected detect the dropout service behaviour of described drop-away reset mechanism, leak(age) test circuit controlling organization and leak(age) test circuit are normally open.

14; unit for safeguarding inversed connection in ground fault circuit interrupter as claimed in claim 1; it is characterized in that also comprising leak(age) test circuit controlling organization; described leak(age) test circuit controlling organization has reference test bar; touch-switch; one end of described reference test bar contacts with the leak(age) test button; the other end contacts with touch-switch in being installed in described circuit board; described touch-switch and leak(age) test circuit are in normal off and open state, and described leak(age) test button acts on that described reference test bar makes the closed conducting leak(age) test circuit working of touch-switch and the dropout service behaviour that detects described drop-away reset mechanism.