CN1741225A

CN1741225A - Grounding fault breaker

Info

Publication number: CN1741225A
Application number: CN 200410064472
Authority: CN
Inventors: 苏列
Original assignee: Nandao Electromechanical Co Ltd Yuhuan County
Current assignee: Nandao Electromechanical Co Ltd Yuhuan County
Priority date: 2004-08-27
Filing date: 2004-08-27
Publication date: 2006-03-01
Anticipated expiration: 2024-08-27
Also published as: CN100492579C

Abstract

A circuit breaker of earthening fault consists of a mechanical tripping mechanism, waterproof shell , control circuit and connecting system . It is featured as setting on - off switch in said system for switching on or off power to load , connecting active silver contact to static silver contact through the second spring elastic force for connecting through power to load at the second position , breaking off active silver contact from static silver contact and stopping it at the first position by utilizing electromagnetic force generated by instant current of power on to overcome elastic force of the second spring .

Description

Ground-fault interrupter

Technical field

The present invention relates to a kind of ground-fault interrupter, especially a kind of ground-fault interrupter plug that has water-proof function and adopt mechanical type to reset.

Background technology

Protective device such as ground-fault interrupter (GFCI), owing to can prevent equipment and the fire incident that the person gets an electric shock and earth fault causes effectively, thereby be subjected to extensive use.

Along with science and technology development, ground-fault interrupter develops to high-performance, low cost, energy-conservation direction, ground-fault interrupter in the past is general more complicated all structurally, thereby to parts processing with install higher requirement is all arranged, so just the processing to product brings very big inconvenience, thereby can influence original performance of entire product.

As U.S. Pat 6,624,991B1 and US 5,815,363 described circuit breakers all are to adopt electricity to keep snap close, and its tripping coil is in "on" position always after the power-on-reset, and the energy-efficient performance that so not only influences circuit breaker itself also has influence on its useful life, and its structure more complicated has improved production cost greatly; Though the point simple in structure comparatively speaking of the circuit breaker described in the above-mentioned previous patent, if but at when work power cut-off, it has just been threaded off automatically, when power supply is sent a telegram here, can not automatically reset, must again by reset key circuit breaker that resets, thereby in the local time that this circuit breaker is used in that the user is difficult for touching, will bring very big inconvenience to the user;

In U.S. Pat 5,943,199, described circuit breaker is to adopt the mechanical type return actuator, and its described reset lever (reset column) spurs its actuator by the hook on the actuator (actuator), makes reset of breaker; This device is to utilize the armature drive actuator on the release to make the hook on the actuator break away from reset lever, thereby makes circuit breaker tripping; All circuit breakers that adopt similar this kind technology to produce all have a common drawback will cause that dropout is not agile exactly when hook and reset lever contact-making surface or contact force are excessive, and will cause that when reducing its contact-making surface or contact force the slight vibration of product will thread off, the phenomenon that false tripping promptly can occur, so the product that this technology is produced is no matter be all to have very big hidden danger from the processing aspect or from the properties of product aspect.

Therefore, a kind of ground-fault interrupter GFCI need to be proposed, solving the defective of above existing like product effectively, and it have energy-conservation, safe, can false tripping not appear because of slight vibration, be active in one's movements, characteristics easy to assembly.

Summary of the invention

Main purpose of the present invention is to solve above-mentioned prior art problems and a kind of ground-fault interrupter GFCI that adopts mechanical tripping mechanism and control circuit is provided, its have energy-conservation, safe, can false tripping not appear because of slight vibration, be active in one's movements, easy to assembly.Another object of the present invention is to provide a kind of ground-fault interrupter, it has water-proof function.

For achieving the above object, the invention provides a kind of ground-fault interrupter, comprising: the circuit board, that a housing, is positioned at this housing is positioned at the tripping mechanism of housing and the control circuit of a control tripping mechanism action, and this tripping mechanism comprises:

A pair of quiet contact is electrically connected with power supply and is fixed in this housing;

One first flexible member, one end are fixed in this housing;

One locking bar that moves back and forth, the one end is connected with the other end of this first flexible member, and the other end is limited by this circuit board; This locking bar is provided with block;

One is around in the tripping coil of coil rack, and the control circuit of this tripping coil energising is electrically connected;

One dropout armature is driven by the electromagnetic force of this tripping coil energising;

One second flexible member, the one end is connected with this coil rack;

One balancing stand that can between the primary importance and the second place, move, a side of this balancing stand is relative with this block, and its opposite side is connected with the other end of this dropout armature, and offsets with the other end of this second flexible member;

A pair of moving contact, relative with this quiet contact, and be located on this balancing stand, be electrically connected with load;

Wherein, when this balancing stand is in this primary importance, the elastic force of this this second flexible member of block contact and this balancing stand of contact, this moving contact separates with this quiet contact; When this balancing stand was in this second place, this block was thrown off this balancing stand, and this second flexible member pushes this balancing stand, and this moving contact electrically contacts with this quiet contact.

According to above-mentioned ground-fault interrupter, also be provided with reset key on this housing, the groove that this reset key lower end is provided with back-moving spring and connects with the other end of this locking bar.

According to above-mentioned ground-fault interrupter, this reset key is provided with waterproof jacket.

According to above-mentioned ground-fault interrupter, this control circuit comprises integrated amplifier, and the DC circuit that is electrically connected with this integrated amplifier respectively, fault current testing circuit, neutral misconnection ground protective circuit and dropout control circuit; When this fault current testing circuit detects fault current between two power lines and this fault current greater than a threshold value, send a signal to this integrated amplifier, export one first signal to this control circuit of threading off by this integrated amplifier, control the action of this tripping mechanism; This neutrality misconnection ground protective circuit detects neutral misconnection ground, forms sine-wave oscillator with this fault current testing circuit and this integrated amplifier, causes this integrated amplifier to export a secondary signal to this control circuit of threading off, and controls the action of this tripping mechanism.

According to above-mentioned ground-fault interrupter, this fault current testing circuit comprises the magnetic test coil that passes two power lines simultaneously, the two ends of this magnetic test coil are in parallel with first electric capacity, the one end is connected with this second electric capacity, the other end is connected with this integrated amplifier, the other end of this second electric capacity is connected in series with a resistance, and the other end of this resistance is connected with this integrated amplifier.

According to above-mentioned ground-fault interrupter; this neutrality misconnection ground protective circuit is made of the neutral misconnection ground protection coil, second electric capacity and the 3rd electric capacity that pass two power lines; the two ends of this neutrality misconnection ground protection coil are in parallel with this second electric capacity; the one end is connected with the 3rd electric capacity; other end ground connection, the other end of the 3rd electric capacity is connected with this integrated amplifier.

According to above-mentioned ground-fault interrupter, this dropout control circuit comprises thyristor, and an end of this tripping coil is connected with power line, and the other end is connected with the anode of this thyristor, the trigger electrode of this thyristor is connected with this integrated amplifier, the minus earth of this thyristor.

According to above-mentioned ground-fault interrupter, also be provided with feeler switch on this housing, after being pressed, this feeler switch is electrically connected with the continuity test circuit, and this continuity test circuit sends fault-signal to this circuit breaker.

According to above-mentioned ground-fault interrupter, this feeler switch is provided with waterproof jacket.

According to above-mentioned ground-fault interrupter, this circuit board is provided with fixed frame, and this first flexible member is fixed on this fixed frame; This coil rack is fixed on this circuit board and is placed in this fixed frame.

Particularly, ground-fault interrupter GFCI of the present invention comprises mechanical tripping mechanism, has housing, mechanism for testing (feeler switch and test circuit), indication mechanism (indicator light etc.), power supply and the load break-make system of connections and the correspondent control circuits of water-proof function.Mainly be to be used for the plug form, and have water-proof function.

By down making block on the locking bar position that goes out of lock by reset key, and the elastic force that utilizes second flexible member (spring) makes contact (movable contact silver point) contact with quiet contact (stationary contact silver point) and keeps being in closure state always, reaches the purpose of reset of breaker.As seen, because the tripping mechanism of circuit breaker of the present invention is mechanical, it is not by electric power the sound contact to be kept closed, so mouth can saves energy, even occur the situation of power cut-off at work, this circuit breaker phenomenon of also can not threading off.When GFCI switches on, if with load end leak current fault occurs or add the test of fault current artificially, control circuit will trigger controllable silicon SCR, make it conducting, the tripping coil energising that one end is linked to each other with controllable silicon SCR, utilize tripping coil to produce an electromagnetic force and act on dropout armature, overcome the elastic force of second spring after dropout armature is stressed and drive coupled balancing stand and move, balancing stand drives moving contact fixed thereon again and moves together, and utilize the block on the locking bar to make the moving contact on the balancing stand rest on primary importance, moving contact separates with quiet contact, thereby makes circuit breaker reach the purpose of rapid dropout open circuit.

A further object of the invention provides a special control circuit.This control circuit comprises: DC power supply, integrated amplifier, fault current testing circuit, neutral misconnection ground protective circuit, dropout control circuit.Wherein, DC circuit is made up of four diodes with unidirectional conducting function, and four diodes are formed a full-wave bridge rectifier circuit, and like this, the alternating current of input has just become direct current output through this bridge commutating circuit; Integrated amplifier is special-purpose integrated circuit (as integrated circuit RV4145); In the fault current testing circuit, two power lines pass magnetic test coil simultaneously, utilize magnetic test coil detect these two power lines by electric current vector and, the action of control tripping mechanism, this vector and be zero during the fault-free electric current at ordinary times, when fault current, this vector and non-vanishing, when fault current increases to the 5mA left and right sides, magnetic test coil can induce a corresponding voltage signal, this signal is after integrated circuit amplifies, and when reaching setting threshold as if this signal, 5 pin of integrated amplifier will be exported triggering signal, make the controllable silicon conducting of control tripping coil, the tripping coil energising is threaded off tripping mechanism in official hour, ground-fault interrupter GFCI disconnects; Neutral misconnection ground protective circuit constitutes transformer-coupled sine-wave oscillator with certain frequency of oscillation by magnetic test coil and neutral misconnection ground protection coil, when neutral misconnection ground phenomenon takes place, this oscillator starting of oscillation, when amplitude reaches the integrated amplifier threshold value, the 5 pin output triggering signal of integrated amplifier, the tripping mechanism action, ground-fault interrupter GFCI disconnects; The dropout control circuit is controlled the "on" position of tripping coil by a controllable silicon, thereby controls the action of tripping mechanism.

Description of drawings

Fig. 1 is a ground-fault interrupter GFCI stereo appearance figure of the present invention;

Fig. 2 is the cutaway view of the rigging position relation of the ground-fault interrupter GFCI of expression tripping mechanism of the present invention when being in trip status;

Fig. 3 is the internal structure stereogram that ground-fault interrupter GFCI of the present invention removes bonnet;

Fig. 4 is the internal structure stereogram that GFCI of the present invention removes forward and backward lid;

Fig. 5 a is the three-dimensional exploded view of mechanical tripping of the present invention mechanism;

Fig. 5 b is the three-dimensional combination figure of mechanical tripping of the present invention mechanism;

Fig. 5 c is the stereogram of the mechanical tripping mechanism of the another kind of form of the present invention;

Fig. 5 d is the stereogram of the mechanical tripping mechanism of the another kind of form of the present invention;

Fig. 6 is the stereogram of the setting position relation of expression tripping mechanism of the present invention on circuit board;

Fig. 7 is the three-dimensional exploded view of ground-fault interrupter GFCI of the present invention;

Fig. 8 a is the partial cross section view that ground-fault interrupter GFCI of the present invention is in trip status;

Fig. 8 b is the partial cross section view that ground-fault interrupter GFCI of the present invention is in closure state;

Fig. 8 c is the partial perspective view that ground-fault interrupter GFCI of the present invention is in trip status;

Fig. 8 d is the partial perspective view that ground-fault interrupter GFCI of the present invention is in closure state;

Fig. 9 is a GFCI circuit diagram of the present invention.

Embodiment

Fig. 1 is the stereo appearance figure of ground-fault interrupter GFCI of the present invention; Wherein 10 is that pedestal, 11 is that protecgulum, 12 is that bonnet, 13 is that waterproof seal, 14 is that cable jacket, 15 is that indicator-lamp cover, 30 is that reset key, 40 is that feeler switch, 70 is that grounding insert-pin, 80 is for importing the power supply inserted sheet for load connects lead, 21.This stereo appearance figure is the stereo appearance figure of ground-fault interrupter GFCI of the electric current 15A of the present invention's a kind of type of plug wherein, the present invention also provides the ground-fault interrupter GFCI of ground fault open circuit GFCI, 20A of other types and ground-fault interrupter of various jack types or the like, and the GFCI of these types has tape light and two kinds of structures of tape light not, the tool operation principle all is the same, here mainly press the three plug stoppage circuit breaker GFCI explanation of electric current 15A tape light, other just do not explain in addition.

Concern in the position of each parts of trip status by we whole as can be seen GFCI of Fig. 2.Each parts mainly is to locate with respect to the housing that is made of pedestal 10, protecgulum 11, bonnet 12.GFCI of the present invention provides mechanical tripping mechanism, whole tripping mechanism is positioned on the circuit board 90 by a fixed frame 50, one end of locking bar 52 is enclosed on first stage clip 51, the restriction that the other end is subjected to circuit board 90 (for example, a hole is established in position relative with first stage clip on this circuit board, and the other end of this locking bar can pass this hole; Certainly, also can adopt other multiple mode to limit this locking bar and under the effect of first stage clip, move), and first stage clip 51 is fixed on the relevant position of fixed frame 50; Utilize the block of locking bar 52 fronts to make balancing stand 53 overcome the elastic force of second stage clip 55 and rest on primary importance (this locking bar separates the sound contact against a side of this balancing stand), promptly keep circuit breaker to handle trip status; One side of balancing stand is corresponding with this block, and its opposite side abuts against on the end of second stage clip 55, and the other end of second stage clip 55 is positioned on the coil rack 56; One end of dropout armature 54 is connected with this opposite side of balancing stand 53, the other end is placed in 56 li of coil racks, tripping coil 57 is wound on the coil rack 56, coil rack is positioned on the circuit board 90 by two binding posts, and two the end of a thread of tripping coil 57 are welded on respectively and are connected in the control circuit on this two binding post; When circuit breaker is in the conducting that resets (closure) state and have fault to take place, control circuit will make tripping coil 57 moments energising, thereby produce an electromagnetic attraction and act on dropout armature 54, dropout armature 54 drives the elastic force that balancing stand 53 overcomes second stage clip 55 again and moves cut-off breaker from the second place (this sound contact electrically contacts) to primary importance; Magnet ring skeleton 60 is welded on the circuit board 90 by four binding posts of its bottom, dress magnetic test coil 61 and the neutral misconnection ground protection coil 63 middle insulating barriers 62 that are separated with thereon.Magnetic test coil 61 is made up of high initial permeability soft magnetism punching lamination, asks by the silica gel bonding for every, and plastics protection box is arranged outward, forms with the enamelled wire coiling.Neutral misconnection ground protection coil 63 constitutes around enamelled wire by wide temperature coefficient, high μ value, be coated with the ferrite of plastics protective layer outward; Circuit board 90 is fixed on the pedestal 10 by two screws 92; Button waterproof jacket 22 is pressed tightly by a fixed head 23 and is put on protecgulum 11; Utilize reseting pressuring spring 31 jack-up reset keys 30, the lower end of reset key 30 is provided with a groove and links to each other with the upper end of locking bar 52, moves downward the purpose that realizes reset of breaker along first direction by driving locking bar 52 by reset key 30 down; Utilize test stage clip 42 jack-up feeler switch 40 and test pieces, by under drive test pieces 41 by feeler switch 40 and move, utilize test pieces 41 continuity test circuit to check circuit breaker whether can normally thread off for artificial fault of circuit breaker.Load connection lead 15 passes cable jacket 14 and is connected on the corresponding binding post, and comes compression load connection lead 15 to prevent that it from coming off because of stressed by the screw of tightening on the tension disc 16 17.Circuit breaker is to come waterproof by at the joint of housing waterproof seal 13 being installed.

As shown in Figure 3, Figure 4, only need open bonnet 12 just can connect load wire 15 easily as required.The power supply of the control circuit of circuit breaker is to insert and be connected on the circuit board by two

lead

811A, 811B by power supply inserted

sheet

80A, 80B, powers to control circuit.

Fig. 5 a, Fig. 5 b are respectively the exploded view of tripping mechanism and the stereogram after the assembling, whole tripping mechanism mainly comprises: fixed frame 50, first stage clip 51, locking bar 52, balancing stand 53, dropout armature 54, second stage clip 55, coil rack 56, tripping coil 57, wiring pin 58, movable

contact silver point

82A, 82B are riveted on respectively on movable contact spring 83A, the 83B, and

movable contact spring

83A, 83B are riveted on the balancing stand 53 by rivet 84A, 84B respectively; Motion after utilizing dropout armature 54 stressed drives balancing stand 53 and moves to primary importance, utilizes the elastic force of second stage clip 55 to promote balancing stand and moves to the second place.

Fig. 5 c and Fig. 5 d be respectively another kind of form tripping mechanism exploded view and the assembling after stereogram, its whole tripping mechanism mainly comprises: fixed frame 50, first stage clip 51, locking bar 52, balancing stand 53, dropout armature 54, the

second stage clip

55A and 55B, coil rack 56, tripping coil 57, wiring pin 58,

block

59A and 59B, movable

contact silver point

movable contact spring

83A, 83B are riveted on the balancing stand 53 by rivet 84A, 84B respectively; Motion after utilizing dropout armature 54 stressed drives balancing stand 53 and moves to primary importance, utilizes the elastic force of the

second stage clip

55A and 55B to promote balancing stand and moves to the second place.The

second stage clip

55A and 55B be installed in respectively among the groove 50A and 50B of fixed frame 50 both sides (wherein 50A be positioned at 50B over against side, do not represent among the figure),

block

59A and 59B are fixed on respectively on the groove of fixed frame both sides, skid off groove to prevent the second stage clip 55A and 55B.The release of this kind form, the motion of balancing stand 53 is steady relatively, and makes the break-make of contact also steady comparatively speaking, but cost increases.

As shown in Figure 6, whole tripping mechanism is positioned on the circuit board 90 by fixed frame 50, two

flexible conductor

85A, 85B one ends are welded on respectively on movable contact spring 83A, the 83B on the balancing stand 53, the other end is welded on respectively and is connected on sheet 86A, the 86B,

brace

86A, 86B are welded on the circuit board 90, are connected in the control circuit.

Fig. 7 is the exploded view of whole GFCI; By scheming us as can be seen, whole GFCI mainly is made up of pedestal 10, protecgulum 11, bonnet 12, waterproof seal 13, cable jacket 14, power supply and load break-make system of connections, button part, magnet ring part, tripping mechanism and control circuit etc.;

Wherein power supply mainly comprises with load break-make system of connections: contact silver point 81A a pair of having, the power supply inserted sheet 80A of 81B, 80B, the a pair of contact silver point 82A that has, the movable contact spring 83A of 82B, 83B, a pair of

flexible conductor

85A, 85B, a pair of

brace

86A, 86B, the a pair of lead 87A that passes magnet ring, 87B, the sub-88A of pair of terminals, 88B, a pair of

tension disc

89A, 89B, a pair of

terminal screw

810A, 810B and grounded part, wherein grounded part comprises: grounding insert-pin 70, earth lug 71, connect lead 72, earth terminal 73, earthing screw 74, tension disc 75.

The button part mainly comprises: button waterproof jacket 22, fixed head 23, reset key 30, reseting pressuring spring 31, feeler switch 40, test pieces 41.Magnet ring part mainly comprises: magnet ring skeleton 60, magnetic test coil 61, insulating barrier 62, neutral misconnection ground protection coil 63, four wiring pin 64.

In addition, 21 is that indicator-lamp cover, 92 is that circuit board mounting screw, 90 is that circuit board, 16 is that load wire tension disc, 17 is screw; All parts utilize six trip bolts 18 fastening after pressing diagramatic way and position assembling.All be with collision mat 19 on each trip bolt and come waterproof action.

Described reset of breaker state and trip status are shown in Fig. 8 a, Fig. 8 b, Fig. 8 c, Fig. 8 d; Wherein Fig. 8 a, Fig. 8 c represent that circuit breaker is in trip status, and the moving contact that utilizes the block 52A of locking bar 52 fronts to keep being fixed on the balancing stand 53 is in the first position always, promptly keeps circuit breaker to be in trip status always; Fig. 8 b, Fig. 8 d represent that circuit breaker is in the conducting that resets (closure) state, move by driving locking bar 52 by reset key 30 down, when the block 52A of locking bar 52 fronts breaks away from balancing stand 53, second stage clip 55 of pressurized will force balancing stand 53 to move to the second place, movable

contact silver point

82A, 82B are contacted with stationary

contact silver point

81A, 81B respectively, thereby make closing of power circuit breaker, this moment, indicator light 91 was shinny; When having earth fault to take place for artificial fault of circuit or load by feeler switch 40 instantly, control circuit will make tripping coil 57 energisings, producing an electromagnetic attraction acts on the armature 54, making the stressed back of armature 54 drive balancing stand 53 rapidly moves to primary importance, again because

movable contact spring

83A, 83B are fixed on the both sides of balancing stand 53 respectively, so the moving of balancing stand 53 also just drives

contact

83A, 83B and to move to same direction, thereby make movable

contact silver point

82A, 82B break away from stationary

contact silver point

81A, 81B, the disconnecting consumers power supply, this moment, indicator light extinguished.The break-make mode of this kind circuit breaker has threads off rapidly, prevents that the phenomenon of misoperation takes place owing to slight vibration, thereby has good security performance.

Fig. 9 is the control circuit figure of the typical GFCI of the present invention; Diode D ₁～D ₄Constitute rectification circuit, the alternating current of input is become the direct current of output, thereby usually also be referred to as DC circuit.This DC circuit anode and filter resistance R ₂Connect R ₂The other end and filter capacitor C ₅One end connects, C ₅The other end is connected with ground, capacitor C ₅Direct voltage about the 26V of two ends is the DC power supply of electronic circuit.

Integrated amplifier is GFCI application-specific integrated circuit (ASIC) RV4145A (or integrated circuit RV2145) etc.

Pass the output shunt capacitance C of the magnetic test coil 61 of two power lines simultaneously ₀, an end series capacitance C ₁, C ₁The other end and resistance R ₃Serial connection, R ₃The other end be connected with input 1 pin of integrated amplifier, another input 3 pin of the other end of magnetic test coil and integrated amplifier connect and compose transformer coupled differential input circuit.Wherein, R ₁For feedback resistance one end is connected with the pin 1 of integrated amplifier, the other end is connected R with output 7 pin of integrated amplifier ₁The resistance size determines the multiplication factor of integrated amplifier, promptly determines the size of GFCI dropout action failure current value.

Pass neutral misconnection ground protection coil 63, the capacitor C of two power lines simultaneously ₂, capacitor C ₃Constitute a neutral misconnection ground protective circuit; Protection coil 63 two ends, neutral misconnection ground and capacitor C ₂Parallel connection, one end and capacitor C ₃Connect other end ground connection, capacitor C ₃The other end is connected with output 7 pin of integrated amplifier.Neutral misconnection ground protection is made of the sine-wave oscillator of transformer coupled corresponding frequency of

oscillation coil

61,63; when neutral misconnection ground phenomenon takes place; this oscillator starting of oscillation; when amplitude reaches the threshold value of integrated amplifier; the 5 pin output triggering signal of integrated amplifier; the release action, GFCI disconnects.That is, form sinusoidal wave amplifier jointly by neutral misconnection ground protection coil 63, integrated amplifier, magnetic test coil 61, it is the amplifier with positive feedback enlarging function.When GFCI neutral output terminal line is grounded, ground connection, coil 61, coil 63, integrated amplifier and respective element are grounded loop and connect, cause positive feedback effect to take place, vibrate until circuit, when the oscillating voltage peak value met or exceeded the previous peaks of controllable silicon trigger comparator, controllable silicon output can raise, when reaching set point, the controllable silicon conducting drives trigger element, rapidly open circuit.By the numerical value decision of components and parts in the circuit, coil 63, C ₂, C ₃Frequency of oscillation is than sine-wave oscillator frequency height, thus the loop gain of assurance oscillator.

Tripping coil 57, controllable silicon SCR, capacitor C ₄Deng dropout control circuit of formation; Wherein, one end of tripping coil 57 is connected with power supply (Line) end of GFCI, and the other end is connected with the anode of controllable silicon SCR, and the trigger electrode of controllable silicon SCR is connected with IC triggering signal output 5 pin, the controllable silicon SCR minus earth, anti-interference capacitor C in parallel between controllable silicon SCR trigger electrode and ground ₄ Magnetic test coil 61 detect two power lines by electric current vector and, this vector and be zero during the fault-free electric current at ordinary times, when fault current, this vector and non-vanishing is when fault current increases to setting threshold, magnetic test coil can induce a correspondent voltage signal, and, making the controllable silicon SCR conducting in 5 pin of integrated amplifier output triggering signal, tripping coil 57 is charged, release is threaded off at the appointed time, and GFCI disconnects.

Feeler switch (TEST), test resistance R ₀Constitute a test circuit; Wherein, test resistance R ₀Be connected R with power end ₀The other end is connected with feeler switch (TEST), and the feeler switch other end is connected with the other end of load (Load).Test circuit is to provide fault current about 8mA to GFCI, makes regular check on the GFCI operating state.

Power end piezo-resistance Mov in parallel, when suddenly high voltage being arranged in the power supply, but the transient absorption high voltage plays a protective role.

GFCI can be set simultaneously connect indicating circuit; Light-emitting diode D in its circuit ₅One end is connected D with load (Load) end ₅The other end and current-limiting resistance R ₄One end connects, R ₄The other end is connected with load (Load) other end, and when GFCI connected, light-emitting diode was shinny.

In sum, ground-fault interrupter GFCI provided by the present invention has advantages such as dropout is rapid, easy to operate, rational in infrastructure, energy-conservation, cost is low, security performance is good.

Above-described only is the typical essential characteristic of the present invention, and any technical staff in this field does not break away from design soul of the present invention to the change that the present invention did.

Claims

1. ground-fault interrupter comprises: the circuit board, that a housing, is positioned at this housing is positioned at the tripping mechanism of housing and the control circuit of a control tripping mechanism action, it is characterized in that this tripping mechanism comprises:

One first flexible member, one end are fixed in this housing;

One second flexible member, the one end is connected with this coil rack;

2. ground-fault interrupter according to claim 1 is characterized in that, also is provided with reset key on this housing, the groove that this reset key lower end is provided with back-moving spring and connects with the other end of this locking bar.

3. ground-fault interrupter according to claim 2 is characterized in that this reset key is provided with waterproof jacket.

4. ground-fault interrupter according to claim 1, it is characterized in that, this control circuit comprises integrated amplifier, and the DC circuit that is electrically connected with this integrated amplifier respectively, fault current testing circuit, neutral misconnection ground protective circuit and dropout control circuit; When this fault current testing circuit detects fault current between two power lines and this fault current greater than a threshold value, send a signal to this integrated amplifier, export one first signal to this control circuit of threading off by this integrated amplifier, control the action of this tripping mechanism; This neutrality misconnection ground protective circuit detects neutral misconnection ground, forms sine-wave oscillator with this fault current testing circuit and this integrated amplifier, causes this integrated amplifier to export a secondary signal to this control circuit of threading off, and controls the action of this tripping mechanism.

5. ground-fault interrupter according to claim 4, it is characterized in that, this fault current testing circuit comprises the magnetic test coil that passes two power lines simultaneously, the two ends of this magnetic test coil are in parallel with first electric capacity, the one end is connected with this second electric capacity, the other end is connected with this integrated amplifier, and the other end of this second electric capacity is connected in series with a resistance, and the other end of this resistance is connected with this integrated amplifier.

6. ground-fault interrupter according to claim 4; it is characterized in that; this neutrality misconnection ground protective circuit is made of the neutral misconnection ground protection coil, second electric capacity and the 3rd electric capacity that pass two power lines; the two ends of this neutrality misconnection ground protection coil are in parallel with this second electric capacity; the one end is connected with the 3rd electric capacity; other end ground connection, the other end of the 3rd electric capacity is connected with this integrated amplifier.

7. ground-fault interrupter according to claim 4, it is characterized in that, this dropout control circuit comprises thyristor, one end of this tripping coil is connected with power line, the other end is connected with the anode of this thyristor, the trigger electrode of this thyristor is connected with this integrated amplifier, the minus earth of this thyristor.

8. ground-fault interrupter according to claim 1 is characterized in that, also is provided with feeler switch on this housing, is electrically connected with the continuity test circuit after this feeler switch is pressed, and this continuity test circuit sends fault-signal to this circuit breaker.

9. ground-fault interrupter according to claim 8 is characterized in that this feeler switch is provided with waterproof jacket.

10. according to each described ground-fault interrupter in the claim 1 to 9, it is characterized in that this circuit board is provided with fixed frame, this first flexible member is fixed on this fixed frame; This coil rack is fixed on this circuit board and is placed in this fixed frame.