CN102074930B

CN102074930B - Electric leakage detection protective circuit

Info

Publication number: CN102074930B
Application number: CN201010237744.7A
Authority: CN
Inventors: 黄华道
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-11-19
Filing date: 2010-07-27
Publication date: 2014-04-02
Anticipated expiration: 2030-07-27
Also published as: CN102074930A; CN201774225U; CN201774223U

Abstract

The invention discloses an electric leakage detection protective circuit. The electric leakage detection protective circuit comprises an induction coil for detecting leakage current, a self-detecting coil for detecting low resistance faults, a control chip, a trip coil with a built-in iron core, and controlled silicon. The electric leakage detection protective circuit is characterized by also comprising at least one switch group, wherein the switch group consists of a normally-open switch and a normally-closed switch which are connected in parallel; and the switch group is connected in series in the electric leakage detection protective circuit. At the moment of reset/dropout/trip of a reset button of a power supply socket, the normally-open switch and the normally-closed switch for forming the switch group are switched. The trip impact current flowing through the controlled silicon, the trip coil and the controlled chip disappears, so that high impact current is prevented from flowing through the controlled silicon, the trip coil and the controlled chip in short time, the service lives of the controlled silicon and the trip coil are greatly prolonged, and the service life of the electric leakage detection protective circuit is further prolonged.

Description

Leakage current detection protection circuit

Technical field

The present invention relates to a kind of circuit with detection of electrical leakage, defencive function being arranged in supply socket.

Background technology

Along with having the development of supply socket (the be called for short GFCI) industry of creepage protection function, people require more and more higher to having the function, safety in utilization, reliability, useful life etc. of the supply socket of creepage protection function.This makes insider constantly be devoted to research, improvement is arranged on the leakage current detection protection circuit in supply socket, makes more succinct, the with better function strength of its circuit, longer service life.

Fig. 1 is common leakage current detection protection circuit circuit diagram.As shown in the figure, this leakage current detection protection circuit mainly comprise induction coil L1 for detection of leakage current, for detection of low resistance fault from magnetic test coil L2, control chip IC1 (model RV4145), the tripping coil SOL that is built-in with iron core, controllable silicon SCR etc.When leak current fault appears in load, when short trouble or low resistance fault, the current imbalance in supply line, induction coil L1, from magnetic test coil L2, output signal to control chip IC1, the pin 5 output high level of control chip IC1, trigger controllable silicon SCR conducting, making has electric current to flow through in tripping coil SOL, in tripping coil SOL, produce magnetic field, be built in the iron core action in tripping coil SOL, thereby make the mechanical device action in supply socket, make the thread off/tripping operation of reset button RESET in supply socket, make the electric power connecting valve KR-2-1 with reset button RESET interlock, KR-2-2, KR-3-1, KR-3-2 disconnects, the cut off the electricity supply power supply output of socket.

The drawback of this common leakage current detection protection circuit is: when leak current fault, short trouble, low resistance fault etc. appear in load; before larger short circuit current, fault current do not disappear; larger fault current, short circuit current are when quick disjunction electric power connecting valve; have the dropout impulse current that more powerful back electromotive force forms; controllable silicon SCR, control chip IC1, tripping coil SOL flowed through in short time; greatly reduce the useful life of controllable silicon SCR, control chip IC1; thereby, the useful life of having reduced leakage current detection protection circuit.

For this reason, the inventor improves common leakage current detection protection circuit.

Summary of the invention

In view of the foregoing, main purpose of the present invention is to provide and a kind ofly can greatly promotes the leakage current detection protection circuit Novel leakage detection protection circuit in useful life.

Another object of the present invention is to provide a kind of Novel leakage detection protection circuit destruction supply socket and the miscellaneous equipment that is connected with supply socket being caused due to thunderbolt or the instantaneous pressure that causes of other reasons to protective effect.

For achieving the above object, the present invention is by the following technical solutions: a kind of leakage current detection protection circuit, it comprise induction coil for detection of leakage current, for detection of low resistance fault from magnetic test coil, control chip, the tripping coil that is built-in with iron core, controllable silicon; It is characterized in that: this leakage current detection protection circuit also comprises at least one group of switches set, this switches set consists of a normal open switch and a normally closed switch of parallel connection; The moment of reset in supply socket reset button/dropout/tripping operation, normal open switch and the normally closed switch of described formation switches set switch; This switches set is connected in leakage current detection protection circuit;

This leakage current detection protection circuit also includes a reset paths starting switch, the reset button interlock of this reset paths starting switch and supply socket; When reset button is pressed, described reset paths starting switch is closed, and during reset/dropout/tripping operation of reset button, described reset paths starting switch is in off-state;

The common of this leakage current detection protection circuit is connected with the zero line of power input by described reset paths starting switch, and meanwhile, the common of leakage current detection protection circuit is also connected with the zero line of power output end; Or the common electrical source of leakage current detection protection circuit is connected with the live wire of power input by described reset paths starting switch, meanwhile, the common electrical source of leakage current detection protection circuit is also connected with the live wire of power output end.

This leakage current detection protection circuit also comprises the lightning-arrest sheet metal in two tips for the right-angled triangle that discharges or isosceles triangle shape; Wherein, at least one most advanced and sophisticated lightning-arrest sheet metal is connected with live wire or the zero line of power output end; The lightning-arrest sheet metal in described tip is staggered relatively, and the distance between two lightning-arrest sheet metal lower inside in tip is greater than the distance between its upper inner.

Accompanying drawing explanation

Fig. 1 is common leakage current detection protection circuit physical circuit figure;

Fig. 2 is leakage current detection protection circuit embodiment 1 physical circuit figure disclosed by the invention;

Fig. 3 is leakage current detection protection circuit embodiment 2 physical circuit figure disclosed by the invention;

Fig. 4 is leakage current detection protection circuit embodiment 3 physical circuit figure disclosed by the invention;

Fig. 5 is leakage current detection protection circuit embodiment 4 physical circuit figure disclosed by the invention;

Fig. 6 is leakage current detection protection circuit embodiment 5 physical circuit figure disclosed by the invention;

Fig. 7 is leakage current detection protection circuit embodiment 6 physical circuit figure disclosed by the invention;

Fig. 8 is leakage current detection protection circuit embodiment 7 physical circuit figure disclosed by the invention.

Embodiment

Before not disappearing for fear of the short circuit current larger, fault current; controllable silicon V4, control chip IC1, tripping coil SOL flowed through in the dropout impulse current short time that the more powerful back electromotive force producing in circuit forms; the life-span of controllable silicon V4, tripping coil SOL, control chip IC1 is reduced greatly; thereby, reduced the useful life of leakage current detection protection circuit.The present invention has increased at least one group of switches set in leakage current detection protection circuit, and this switches set consists of a normal open switch and a normally closed switch of parallel connection.The moment that resets in reset button/tripping operation/thread off, by having the mechanical device in the supply socket of creepage protection function, switches this group switches set, that is, the normally closed switch in this switches set is disconnected, normal open switch closure; Or make the normally closed switch that is off-state transfer closure to, the normal open switch that is closure state transfers disconnection to.By switching this switches set; the larger dropout impulse current that makes to flow through in controllable silicon V4, tripping coil SOL disappears; thereby; controllable silicon V4, tripping coil SOL are avoided in the short time by large impulse current; greatly improve its useful life, further improve the useful life of leakage current detection protection circuit.

When switching this switches set; all the time to keep a switch closure; a switch disconnects; its objective is: assurance leakage current detection protection circuit can normally be worked; when again there is leak current fault, short trouble or other fault; leakage current detection protection circuit can make the mechanical device action in supply socket, makes thread off/tripping operation of reset button RESET.

As shown in Fig. 2-Fig. 7, the switches set that the present invention increases in leakage current detection protection circuit consists of normally closed switch K1 in parallel and normal open switch K2.One end of this switches set is connected with control signal output 5 pin of control chip IC1, and the other end is extremely connected with the control of controllable silicon V4.

When leakage current detection protection circuit initial condition, normally closed switch K1 is closed, and normal open switch K2 disconnects.When reset button RESET is pressed, closed with the reset paths starting switch KR-4 of reset button RESET interlock, the live wire HOT of power input LINE is through induction coil L1, be connected with the zero line WHITE of power input from magnetic test coil L2, tripping coil SOL, simulation leakage current generating resistance R 5, K switch 6 or K switch 5, shock resistance current-limiting resistance R6, reset paths starting switch KR-4, form loop, produce simulation leakage current.When leakage current detection protection circuit detects after fault current, the 5 pin output high level of control chip IC1, make controllable silicon V4 conducting, in tripping coil SOL, there is electric current to flow through, in tripping coil SOL, produce magnetic field, be built in the iron core action in tripping coil SOL, make the mechanical device action in supply socket, mechanical device resets the reset button RESET in supply socket, and reset paths starting switch KR-4 disconnects, and simulation leakage current disappears; Closed with electric power connecting valve KR-2-1, KR-2-2, KR-3-1, the KR-3-2 of reset button RESET interlock, supply socket has power supply output.The moment resetting at reset button RESET; described normally closed switch K1 and normal open switch K2 switch; the normally closed switch K1 that is closure state disconnects; the normal open switch K2 that is off-state is closed; in the process of switching at normally closed switch K1, normal open switch K2; the dropout impulse current flowing through in controllable silicon V4, tripping coil SOL disappears; thereby; controllable silicon V4, tripping coil SOL are avoided in the short time by large impulse current; greatly improve the useful life of controllable silicon V4, tripping coil SOL, the useful life of further improving leakage current detection protection circuit.

After the normal work of power supply circuits; if broken down in power supply circuits as short circuit, electric leakage, electric arc; leakage current detection protection circuit detects fault; make reset button RESET tripping operation/dropout; in the moment of reset button RESET tripping operation/dropout; described normally closed switch K1 and normal open switch K2 switch again; the normally closed switch K1 that is off-state transfers closure to; the normal open switch K2 that is closure state transfers disconnection to; in the process of switching at normally closed switch K1, normal open switch K2, the dropout impulse current that makes to flow through in controllable silicon V4, tripping coil SOL disappears.So go round and begin again, thereby, controllable silicon V4, tripping coil SOL were avoided in the short time by large impulse current, the useful life of greatly improving controllable silicon V4, tripping coil SOL, the useful life of further improving leakage current detection protection circuit.

As shown in Fig. 2-Fig. 7, the switches set that the present invention is increased in leakage current detection protection circuit can also consist of normally closed switch K3 in parallel and normal open switch K4.One end of this switches set is finally connected with the zero line WHITE of power input LINE, and the other end is connected with the negative electrode of controllable silicon V4.

When leakage current detection protection circuit initial condition, normally closed switch K3 is closed, and normal open switch K4 disconnects.When reset button RESET is pressed, closed with the reset paths starting switch KR-4 of reset button RESET interlock, the live wire HOT of power input LINE is through induction coil L1, be connected with the zero line WHITE of power input from magnetic test coil L2, tripping coil SOL, simulation leakage current generating resistance R 5, K switch 6 or K switch 5, shock resistance current-limiting resistance R6, reset paths starting switch KR-4, form loop, produce simulation leakage current.When leakage current detection protection circuit detects after fault current, the 5 pin output high level of control chip IC1, make controllable silicon V4 conducting, in tripping coil SOL, have electric current to flow through, in tripping coil SOL, produce magnetic field, be built in the iron core action in tripping coil SOL, make the mechanical device action in supply socket, the mechanical device in supply socket resets the reset button RESET in supply socket, simultaneously, reset paths starting switch KR-4 disconnects, and simulation leakage current disappears; Closed with electric power connecting valve KR-2-1, KR-2-2, KR-3-1, the KR-3-2 of reset button RESET interlock, supply socket has power supply output.The moment resetting at reset button RESET; described normally closed switch K3 and normal open switch K4 switch; the normally closed switch K3 that is closure state disconnects; the normal open switch K4 that is off-state is closed; in the process of switching at normally closed switch K3, normal open switch K4; the dropout impulse current flowing through in controllable silicon V4, tripping coil SOL disappears; thereby; controllable silicon V4, tripping coil SOL are avoided in the short time by large impulse current; greatly improve the useful life of controllable silicon V4, tripping coil SOL, the useful life of further improving leakage current detection protection circuit.

After the normal work of power supply circuits; if broken down in power supply circuits; leakage current detection protection circuit detects after fault; make reset button RESET tripping operation/dropout; in the moment of reset button RESET tripping operation/dropout; described normally closed switch K3 and normal open switch K4 switch again; the normally closed switch K3 that is off-state transfers closure to; the normal open switch K4 that is closure state transfers disconnection to; in the process of switching at normally closed switch K3, normal open switch K4, the dropout impulse current flowing through in controllable silicon V4, tripping coil SOL is disappeared again.Work so again and again, thereby, controllable silicon V4, tripping coil SOL were avoided in the short time by large impulse current, the useful life of greatly improving controllable silicon V4, tripping coil SOL, the useful life of further improving leakage current detection protection circuit.

As shown in Fig. 2, Fig. 5, Fig. 6, the switches set that the present invention is increased in leakage current detection protection circuit can also consist of normally closed switch K5 in parallel and normal open switch K6.One end of this switches set is finally connected with the zero line WHITE of power input LINE through switch, resistance, and the other end is connected with the place of working pin 4 of control chip IC1.

When leakage current detection protection circuit initial condition, normally closed switch K5 is closed, and normal open switch K6 disconnects.When reset button RESET is pressed, closed with the reset paths starting switch KR-4 of reset button RESET interlock, the live wire HOT of power input LINE is through induction coil L1, be connected with the zero line WHITE of power input from magnetic test coil L2, tripping coil SOL, simulation leakage current generating resistance R 5, K switch 6 or K switch 5, shock resistance current-limiting resistance R6, reset paths starting switch KR-4, form loop, produce simulation leakage current.When leakage current detection protection circuit detects fault current, the 5 pin output high level of control chip IC1, make controllable silicon V4 conducting, in tripping coil SOL, there is electric current to flow through, in tripping coil SOL, produce magnetic field, be built in the iron core action in tripping coil SOL, make the mechanical device action in supply socket, mechanical device in supply socket resets the reset button RESET in supply socket, the moment resetting at reset button RESET, described reset paths starting switch KR-4 disconnects, simulation leakage current disappears, described normally closed switch K5 and normal open switch K6 switch, be that normally closed switch K5 disconnects, normal open switch K6 is closed, at normally closed switch K5, in the process that normal open switch K6 switches, because the place of working pin 4 of control chip IC1 opens circuit, control chip IC1 cannot normally be worked, whole leakage current detection protection circuit cannot normally be worked, flow through controllable silicon V4, dropout impulse current in tripping coil SOL disappears.

After the normal work of power supply circuits, because normal open switch K6 is closed, if broken down in power supply circuits, leakage current detection protection circuit detects after fault, make reset button RESET tripping operation/dropout, in the moment of reset button RESET tripping operation/dropout, described normally closed switch K5 and normal open switch K6 switch again, the normally closed switch K5 that is off-state transfers closure to, the normal open switch K6 that is closure state transfers disconnection to, at normally closed switch K5, in the process that normal open switch K6 switches, control chip IC1 cannot normally be worked, whole leakage current detection protection circuit is not worked, flow through controllable silicon V4, dropout impulse current in tripping coil SOL disappears.So go round and begin again, thereby, controllable silicon V4, tripping coil SOL were avoided in the short time by large impulse current, the useful life of greatly improving controllable silicon V4, tripping coil SOL, the useful life of further improving leakage current detection protection circuit.

As shown in Fig. 2-Fig. 7, the switches set that the present invention is increased in leakage current detection protection circuit can also consist of normally closed switch K7 in parallel and normal open switch K8.One end of this switches set is finally connected with the live wire HOT of power input LINE by resistance R 1, diode V1, tripping coil SOL, and the other end is connected with the power supply input pin 6 of control chip IC1.

When leakage current detection protection circuit initial condition, normally closed switch K7 is closed, and normal open switch K8 disconnects.When reset button RESET is pressed, closed with the reset paths starting switch KR-4 of reset button RESET interlock, the live wire HOT of power input LINE is through induction coil L1, be connected with the zero line WHITE of power input from magnetic test coil L2, tripping coil SOL, simulation leakage current generating resistance R 5, K switch 6 or K switch 5, shock resistance current-limiting resistance R6, reset paths starting switch KR-4, form loop, produce simulation leakage current.When leakage current detection protection circuit detects fault current, the 5 pin output high level of control chip IC1, make controllable silicon V4 conducting, in tripping coil SOL, there is electric current to flow through, in tripping coil SOL, produce magnetic field, be built in the iron core action in tripping coil SOL, make the mechanical device action in supply socket, mechanical device in supply socket resets the reset button RESET in supply socket, the moment resetting at reset button RESET, described reset paths starting switch KR-4 disconnects, simulation leakage current disappears, described normally closed switch K7 and normal open switch K8 switch, be that normally closed switch K7 disconnects, normal open switch K8 is closed, at normally closed switch K7, in the process that normal open switch K8 switches, because the power supply input pin 6 of control chip IC1 opens circuit, control chip IC1 cannot normally be worked, whole leakage current detection protection circuit cannot normally be worked, flow through controllable silicon V4, dropout impulse current in tripping coil SOL disappears.

After the normal work of power supply circuits; because normal open switch K8 is closed; if broken down in power supply circuits; leakage current detection protection circuit detects after fault; make reset button RESET tripping operation/dropout; in the moment of reset button RESET tripping operation/dropout; described normally closed switch K7 and normal open switch K8 switch again; be that normally closed switch K7 is closed; normal open switch K8 disconnects; in the process of switching at normally closed switch K7, normal open switch K8, the dropout impulse current flowing through in controllable silicon V4, tripping coil SOL is disappeared again.So go round and begin again, thereby, controllable silicon V4, tripping coil SOL were avoided in the short time by large impulse current, the useful life of greatly improving controllable silicon V4, tripping coil SOL, the useful life of further improving leakage current detection protection circuit.

As shown in Fig. 3, Fig. 4, Fig. 7; the present invention is increased in the switches set consisting of normally closed switch K5 in parallel and normal open switch K6 in leakage current detection protection circuit; its one end can also be connected with the zero line WHITE through induction coil L1 and power input LINE from magnetic test coil L2, and the other end is connected with the place of working pin 4 of control chip IC1.

The moment of reset/tripping operation/dropout of the reset button RESET in supply socket; by switching described normally closed switch K5 and normal open switch K6; the dropout impulse current that makes to flow through in controllable silicon V4, tripping coil SOL disappears; thereby; controllable silicon V4, tripping coil SOL are avoided in the short time by large impulse current; greatly improve the useful life of controllable silicon V4, tripping coil SOL, the useful life of further improving leakage current detection protection circuit.

As shown in Figure 4, the switches set that the present invention is increased in leakage current detection protection circuit can also consist of normally closed switch K9 in parallel and normal open switch K10.One end of this switches set is connected with the live wire HOT of power input LINE by shock resistance current-limiting resistance R6, reset paths starting switch KR-4, and the other end is connected with the anode of controllable silicon V4 by tripping coil SOL.

When leakage current detection protection circuit initial condition, normally closed switch K9 is closed, and normal open switch K10 disconnects.When reset button RESET is pressed, closed with the reset paths starting switch KR-4 of reset button RESET interlock, the live wire HOT of power input LINE is through reset paths starting switch KR-4, shock resistance current-limiting resistance R6, K switch 9 or K switch 10, tripping coil SOL, simulation leakage current generating resistance R 5, K switch 6 or K switch 5, induction coil L1, be connected with the zero line WHITE of power input from magnetic test coil L2, form loop, produce simulation leakage current.When leakage current detection protection circuit detects after fault current; make the mechanical device action in supply socket; mechanical device resets the reset button RESET in supply socket; the moment resetting at reset button RESET; described reset paths starting switch KR-4 disconnects; simulation leakage current disappears; described normally closed switch K9 and normal open switch K10 switch; be that normally closed switch K9 disconnects; normal open switch K10 is closed; in the process of switching at normally closed switch K9, normal open switch K10, the dropout impulse current that makes to flow through in controllable silicon V4, tripping coil SOL disappears.

After the normal work of power supply circuits; because normal open switch K10 is closed; if broken down in power supply circuits; leakage current detection protection circuit detects fault; make reset button RESET tripping operation/dropout; in the moment of reset button RESET tripping operation/dropout; described normally closed switch K9 and normal open switch K10 switch again; the normally closed switch K9 that is off-state transfers closure to; the normal open switch K10 that is closure state transfers disconnection to; in the process of switching at normally closed switch K9, normal open switch K10, the dropout impulse current that makes to flow through in controllable silicon V4, tripping coil SOL disappears.So go round and begin again, controllable silicon V4, tripping coil SOL were avoided in the short time by large impulse current, the useful life of greatly improving controllable silicon V4, tripping coil SOL, the useful life of further improving leakage current detection protection circuit.

As shown in Figure 5; the present invention is increased in the switches set consisting of normally closed switch K9 in parallel and normal open switch K10 in leakage current detection protection circuit; its one end can also be connected with the live wire HOT through induction coil L1 and power input LINE from magnetic test coil L2, and the other end passes through tripping coil SOL and is connected with the anode of controllable silicon V4.

The moment of reset/tripping operation/dropout of the reset button RESET in supply socket; by switching described normally closed switch K9 and normal open switch K10; the dropout impulse current that makes to flow through in controllable silicon V4, tripping coil SOL disappears; thereby; controllable silicon V4, tripping coil SOL are avoided in the short time by large impulse current; greatly improve the useful life of controllable silicon V4, tripping coil SOL, the useful life of further improving leakage current detection protection circuit.

As shown in Figure 7, the present invention is increased in the switches set that the switches set in leakage current detection protection circuit can also consist of normally closed switch K11 in parallel and normal open switch K12, and its one end is connected with tripping coil SOL, and the other end is connected with the anode of controllable silicon V4.

The moment of reset/tripping operation/dropout of the reset button RESET in supply socket; by switching described normally closed switch K11 and normal open switch K12; the dropout impulse current that makes to flow through in controllable silicon V4, tripping coil SOL disappears; thereby; controllable silicon V4, tripping coil SOL are avoided in the short time by large impulse current; greatly improve the useful life of controllable silicon V4, tripping coil SOL, the useful life of further improving leakage current detection protection circuit.

In order to improve the useful life of leakage current detection protection circuit; avoid destruction leakage current detection protection circuit and coupled external equipment being caused due to thunderbolt or the instantaneous pressure that causes of other reasons; as shown in Fig. 2, Fig. 6, Fig. 8, leakage current detection protection circuit disclosed by the invention also includes the lightning-arrest sheet metal M1 in one group of tip for the right-angled triangle that discharges or isosceles triangle shape and M2.Wherein, the lightning-arrest sheet metal in tip and induction coil L1 through for detection of leakage current, for detection of the power input live wire HOT from magnetic test coil L2 of low resistance fault, be connected, another most advanced and sophisticated sheet metal of taking shelter from the thunder is connected with the zero line WHITE of power output end LOAD.Most advanced and sophisticated lightning-arrest sheet metal M1 and M2 are staggered relatively, and the distance between two lightning-arrest sheet metal lower inside in tip is greater than the distance between its upper inner.

When supply socket power output end has power supply output; if there is due to thunderbolt or the instantaneous pressure that causes of other reasons; the air dielectric that is connected to the lightning-arrest sheet metal in tip at power input live wire place and is connected between the lightning-arrest sheet metal in tip at power output end zero line place is breakdown; form atmospherical discharges; most of high pressure consumes by lightning-arrest sheet metal; residue sub-fraction consumes by tripping coil SOL, piezo-resistance MOV; thereby protected leakage current detection protection circuit/supply socket, and the safe operation of the miscellaneous equipment being connected with supply socket.

As shown in Figure 3, in another embodiment of the present invention, the lightning-arrest sheet metal M1 in a described tip and induction coil L1 through for detection of leakage current, for detection of the power input zero line WHITE from magnetic test coil L2 of low resistance fault, be connected, another most advanced and sophisticated sheet metal M2 that takes shelter from the thunder is connected with the live wire HOT of power output end LOAD through resistance R 7.

When supply socket power output end has power supply output; if there is due to thunderbolt or the instantaneous pressure that causes of other reasons; the air dielectric that is connected to the lightning-arrest sheet metal in tip at power input zero line place and is connected between the lightning-arrest sheet metal in tip at power output end live wire place is breakdown; form atmospherical discharges; most of high pressure consumes by lightning-arrest sheet metal; residue sub-fraction consumes by tripping coil SOL, piezo-resistance MOV; thereby protected leakage current detection protection circuit/supply socket, and the safe operation of the miscellaneous equipment being connected with supply socket.

As shown in Fig. 4, Fig. 7, in another embodiment of the present invention, the lightning-arrest sheet metal M2 in a described tip and induction coil L1 through for detection of leakage current, for detection of the power input zero line WHITE from magnetic test coil L2 of low resistance fault, be connected, another most advanced and sophisticated sheet metal M1 that takes shelter from the thunder is connected with power output end power firestreak output plughole.

When the power supply output plughole of supply socket power output end has power supply output, if there is due to thunderbolt or the instantaneous pressure that causes of other reasons, the air dielectric that is connected to the lightning-arrest sheet metal in tip at power input zero line place and is connected between the lightning-arrest sheet metal in tip at power output end power firestreak output plughole place is breakdown, form atmospherical discharges, most of high pressure consumes by lightning-arrest sheet metal, residue sub-fraction is by tripping coil SOL, piezo-resistance MOV consumes, thereby protected leakage current detection protection circuit/supply socket, and the safe operation of the miscellaneous equipment being connected with supply socket.

As shown in Figure 5, in another embodiment of the present invention, the lightning-arrest sheet metal M1 in a described tip and induction coil L1 through for detection of leakage current, for detection of the power input live wire HOT from magnetic test coil L2 of low resistance fault, be connected, another most advanced and sophisticated sheet metal M2 that takes shelter from the thunder is connected with power output end zero-power line output plughole.

When the supply hub of supply socket power output end has power supply output, if there is due to thunderbolt or the instantaneous pressure that causes of other reasons, the air dielectric that is connected to the lightning-arrest sheet metal in tip at power input live wire place and is connected between the lightning-arrest sheet metal in tip at power output end zero-power line output plughole place is breakdown, form atmospherical discharges, most of high pressure consumes by lightning-arrest sheet metal, residue sub-fraction is by tripping coil SOL, piezo-resistance MOV consumes, thereby protected leakage current detection protection circuit/supply socket, and the safe operation of the miscellaneous equipment being connected with supply socket.

The lightning-arrest sheet metal in a described tip can also be connected with power output end power firestreak output plughole; Another most advanced and sophisticated lightning-arrest sheet metal is connected with the zero-power line output plughole of power output end.

In addition, as shown in Fig. 2, Fig. 5, Fig. 6, Fig. 8, the present invention is also in series with a shock proof current-limiting resistance R6 and reset paths starting switch KR-4 on power input LINE zero line WHITE.Reset paths starting switch KR-4 and reset button RESET interlock, when reset button RESET is pressed, reset paths starting switch KR-4 is closed, and when reset button RESET resets, threads off, trips, reset paths starting switch KR-4 disconnects.Power input live wire HOT is connected with power input zero line WHITE through tripping coil SOL, simulation leakage current generating resistance R 5, shock proof current-limiting resistance R6, reset paths starting switch KR-4, forms manually simulation leakage current generating loop.

The common of leakage current detection protection circuit (as the negative electrode of the place of working pin 4 of control chip IC1 and controllable silicon V4) is connected with the zero line of power input by reset paths starting switch KR-4; meanwhile, the common of leakage current detection protection circuit is also connected with the zero line of power output end.

When reset button RESET is pressed, reset paths starting switch KR-4 is closed, power input live wire HOT is connected with power input zero line WHITE through tripping coil SOL, resistance R 5, shock proof current-limiting resistance R6, closed reset paths starting switch KR-4, produces simulation leakage current.If leakage current detection protection circuit does not have end-of-life, reset button RESET resets, and supply socket has power supply output.When reset button RESET resets, reset paths starting switch KR-4 disconnects, and simulation leakage current disappears.

When supply socket has after power supply output, this reset paths starting switch KR-4 disconnects already, and whole leakage current detection protection circuit is powered by power output end.In addition; when reset button RESET is during in trip status, because reset paths starting switch KR-4 is in off-state, make not on-load voltage of leakage current detection protection circuit of the present invention; so also the probability of fault be can reduce, thereby reliability and the fail safe of leakage current detection protection circuit work improved.

As shown in Fig. 3, Fig. 4, Fig. 7, in another embodiment of the present invention, shock proof current-limiting resistance R6 and reset paths starting switch KR-4 connect on power input LINE live wire HOT.Reset paths starting switch KR-4 and reset button RESET interlock, when reset button RESET is pressed, reset paths starting switch KR-4 is closed, and when reset button RESET resets, threads off, trips, reset paths starting switch KR-4 disconnects.Power input live wire HOT through reset paths starting switch KR-4, shock proof current-limiting resistance R6, tripping coil SOL, simulation leakage current generating resistance R 5, K switch 6 or K switch 5, induction coil L1, be connected with power input zero line WHITE from magnetic test coil L2, form and manually simulates leakage current generating loop.

The common electrical source of leakage current detection protection circuit (as the anode of the power supply input pin 6 of control chip IC1 and controllable silicon V4) is finally connected with the live wire of power input through tripping coil SOL, shock proof current-limiting resistance R6, reset paths starting switch KR-4; meanwhile, the common electrical source of leakage current detection protection circuit is also connected with the live wire of power output end.

When reset button RESET is pressed, reset paths starting switch KR-4 is closed, power input live wire HOT through reset paths starting switch KR-4, shock proof current-limiting resistance R6, tripping coil SOL, simulation leakage current generating resistance R 5, induction coil L1, be connected with power input zero line WHITE from magnetic test coil L2, produce and simulates leakage current.If leakage current detection protection circuit does not have end-of-life, reset button RESET resets, and supply socket has power supply output.When reset button RESET resets, reset paths starting switch KR-4 disconnects, and simulation leakage current disappears.

As shown in Figure 2, the present invention is also in series with the protective resistance R7 that an anti-power supply is threaded off and recoiled and hit between power input LINE zero line WHITE and power output end LOAD zero line WHITE, and its resistance and R6 are similar is 0 to several ohm.At reset button RESET, reset/thread off/while tripping; in leakage current detection protection circuit, can produce inverse electromotive force; the effect of the protective resistance R7 that this anti-power supply dropout recoil is hit is: stop the impact of inverse electromotive force to circuit, improve the reliability of leakage current detection protection circuit work.

As shown in Figure 3; in another embodiment of the present invention; between power input LINE live wire HOT and power output end LOAD live wire HOT, be in series with the protective resistance R7 that an anti-power supply is threaded off and recoiled and hit; its effect: stop the impact of inverse electromotive force to circuit, improve the reliability of leakage current detection protection circuit work.

As shown in Figure 2, the present invention has also adjusted the link position of simulation leakage current generating resistance R 5, resistance R 5 is connected in parallel on to the two ends of piezo-resistance MOV.Make resistance R 5 not only there is the effect that simulation produces leakage current, also increased the effect that controllable silicon V4 is released energy when ending fast, thereby improve the functional reliability of leakage current detection protection circuit.

In sum, because the present invention adopts above technical scheme, therefore that leakage current detection protection circuit disclosed by the invention has advantages of is following outstanding:

(1) in leakage current detection protection circuit, increased at least one group of switches set, this switches set consists of a normal open switch and a normally closed switch of parallel connection.The moment that resets in reset button/tripping operation/thread off, by the mechanical device in supply socket, this switches set is switched, that is, the normally closed switch in this switches set is disconnected, normal open switch is closed, or the normally closed switch closure that makes to be off-state, the normal open switch that is closure state disconnects.By switching this switches set; the dropout impulse current that makes to flow through in controllable silicon V4, tripping coil SOL, control chip IC1 disappears; thereby; controllable silicon V4, tripping coil SOL, control chip IC1 are avoided at short notice by large impulse current; greatly improve the useful life of controllable silicon V4, tripping coil SOL, the useful life of further improving leakage current detection protection circuit.

(2) because the present invention is provided with a pair of most advanced and sophisticated sheet metal for discharging; when supply socket has power supply output; if between the live wire of power output end and zero line because thunderbolt or other reasons are while causing instantaneous pressure; the air dielectric being connected between the lightning-arrest sheet metal in tip of output is breakdown; form atmospherical discharges; the instantaneous pressure of generation is consumed by lightning-arrest sheet metal; thereby protected leakage current detection protection circuit/supply socket, and the safe operation of the miscellaneous equipment being connected with supply socket.

(3) the present invention is also in series with a shock proof current-limiting resistance R6 and reset paths starting switch KR-4 on power input zero line or live wire.Whether by control switch KR-4, control whole leakage current detection protection circuit works, guarantee leakage protection circuit on-load voltage not under the state of threading off, so also can reduce the probability of fault, thereby improve the reliability and stability of leakage current detection protection circuit work; Meanwhile, also saved electric energy.

(4) because the present invention has also increased a protective resistance R7 that anti-power supply is threaded off and recoiled and hit between power input and power output end; its resistance parameter and R6 are similar; between resistance is 0 to several ohm; stop the impact of inverse electromotive force to circuit; thereby, further improved circuit working reliability of the present invention and fail safe.

(5) due to the present invention, also adjusted the link position of simulation leakage current generating resistance R 5; resistance R 5 is connected in parallel on to the two ends of piezo-resistance MOV; make resistance R 5 not only there is the effect that simulation produces leakage current; also increase the effect that controllable silicon V4 is released energy when ending fast, thereby improved the functional reliability of leakage protection circuit.

The above is specific embodiments of the invention and the know-why used, and any equivalent transformation based on technical solution of the present invention basis, within all belonging to protection range of the present invention.

Claims

1. a leakage current detection protection circuit, it comprise induction coil (L1) for detection of leakage current, for detection of low resistance fault from magnetic test coil (L2), control chip (IC1), the tripping coil (SOL) that is built-in with iron core, controllable silicon (V4); It is characterized in that: this leakage current detection protection circuit also comprises at least one group of switches set, this switches set consists of a normal open switch and a normally closed switch of parallel connection; The moment of reset in supply socket reset button/dropout/tripping operation, normal open switch and the normally closed switch of described formation switches set switch;

This switches set is connected in leakage current detection protection circuit, by switching this switches set, the larger dropout impulse current that makes to flow through in described controllable silicon (V4), tripping coil (SOL) disappears, thereby, described controllable silicon, tripping coil are avoided in the short time by large impulse current;

This leakage current detection protection circuit also includes a reset paths starting switch (KR-4), the reset button interlock of this reset paths starting switch and supply socket; When reset button is pressed, described reset paths starting switch (KR-4) closure, during reset/dropout/tripping operation of reset button, described reset paths starting switch (KR-4) is in off-state;

The common of this leakage current detection protection circuit is connected with the zero line of power input by described reset paths starting switch (KR-4), and meanwhile, the common of leakage current detection protection circuit is also connected with the zero line of power output end; Or the common electrical source of leakage current detection protection circuit is connected with the live wire of power input by described reset paths starting switch (KR-4), meanwhile, the common electrical source of leakage current detection protection circuit is also connected with the live wire of power output end.

2. leakage current detection protection circuit according to claim 1, is characterized in that: described switches set consists of normally closed switch in parallel (K1) and normal open switch (K2);

One end of this switches set is connected with the control signal output of control chip (IC1), and the other end is extremely connected with the control of controllable silicon (V4).

3. leakage current detection protection circuit according to claim 1, is characterized in that: described switches set consists of normally closed switch in parallel (K3) and normal open switch (K4); One end of this switches set is connected with the zero line of power input (LINE) through described reset paths starting switch (KR-4), and the other end is connected with the negative electrode of controllable silicon (V4).

4. leakage current detection protection circuit according to claim 1, is characterized in that: described switches set consists of normally closed switch in parallel (K5) and normal open switch (K6); One end of this switches set is connected with the zero line of power input (LINE) through resistance, described reset paths starting switch (KR-4), and the other end is connected with the place of working pin (4) of control chip (IC1).

5. leakage current detection protection circuit according to claim 1, is characterized in that: described switches set consists of normally closed switch in parallel (K7) and normal open switch (K8); One end of this switches set is finally connected with the live wire of power input (LINE) by resistance (R1), diode (V1), tripping coil (SOL), and the other end is connected with the power supply input pin (6) of control chip (IC1).

6. leakage current detection protection circuit according to claim 1; it is characterized in that: described switches set consists of normally closed switch in parallel (K5) and normal open switch (K6); one end of this switches set is connected with the zero line through induction coil (L1) and power input (LINE) from magnetic test coil (L2), and the other end is connected with the place of working pin (4) of control chip (IC1).

7. leakage current detection protection circuit according to claim 1, is characterized in that: described switches set consists of normally closed switch in parallel (K9) and normal open switch (K10); One end of this switches set is connected with the live wire of power input (LINE) by shock resistance current-limiting resistance (R6), described reset paths starting switch (KR-4), and the other end is connected with the anode of controllable silicon (V4) by tripping coil (SOL).

8. leakage current detection protection circuit according to claim 1; it is characterized in that: described switches set consists of normally closed switch in parallel (K9) and normal open switch (K10); one end of this switches set is connected with the live wire through induction coil (L1) and power input (LINE) from magnetic test coil (L2), and the other end passes through tripping coil (SOL) and is connected with the anode of controllable silicon (V4).

9. leakage current detection protection circuit according to claim 1; it is characterized in that: described switches set consists of normally closed switch in parallel (K11) and normal open switch (K12); one end of this switches set is connected with tripping coil (SOL), and the other end is connected with the anode of controllable silicon (V4).

10. according to the leakage current detection protection circuit one of claim 1-9 Suo Shu, it is characterized in that: this leakage current detection protection circuit also comprises the lightning-arrest sheet metal in two tips for the right-angled triangle that discharges or isosceles triangle shape; Wherein, at least one most advanced and sophisticated lightning-arrest sheet metal is connected with live wire or the zero line of power output end;

The lightning-arrest sheet metal in described tip is staggered relatively, and the distance between two lightning-arrest sheet metal lower inside in tip is greater than the distance between its upper inner.

11. leakage current detection protection circuits according to claim 10; it is characterized in that: the lightning-arrest sheet metal in a described tip and induction coil (L1) through for detection of leakage current, for detection of the power input from magnetic test coil (L2) (LINE) live wire of low resistance fault, be connected, another tip sheet metal of taking shelter from the thunder is connected with the zero line of power output end (LOAD).

12. leakage current detection protection circuits according to claim 10; it is characterized in that: the lightning-arrest sheet metal (M1) in a described tip and induction coil (L1) through for detection of leakage current, for detection of the power input from magnetic test coil (L2) (LINE) zero line of low resistance fault, be connected, another tip sheet metal (M2) of taking shelter from the thunder is connected with the live wire of power output end (LOAD).

13. leakage current detection protection circuits according to claim 10; it is characterized in that: the lightning-arrest sheet metal in a described tip and induction coil (L1) through for detection of leakage current, for detection of (LINE) zero line of the power input from magnetic test coil (L2) or the live wire of low resistance fault, be connected, another tip sheet metal of taking shelter from the thunder is connected with power output end power firestreak output plughole or power output end zero-power line output plughole.

14. leakage current detection protection circuits according to claim 10, is characterized in that: the lightning-arrest sheet metal in a described tip is connected with power output end power firestreak output plughole; Another most advanced and sophisticated lightning-arrest sheet metal is connected with the zero-power line output plughole of power output end.

15. leakage current detection protection circuits according to claim 14, is characterized in that: described leakage current detection protection circuit also comprises the shock proof current-limiting resistance (R6) of a series connection; This shock proof current-limiting resistance (R6) and described reset paths starting switch (KR-4) are connected in power input (LINE) zero line or live wire;

Power input live wire is connected with power input zero line through described tripping coil (SOL), simulation leakage current generating resistance (R5), shock proof current-limiting resistance (R6), reset paths starting switch (KR-4), forms simulation leakage current generating loop.

16. leakage current detection protection circuits according to claim 15, is characterized in that: one end of described reset paths starting switch (KR-4) is connected with power input zero line, and the other end is finally connected with the place of working pin of silicon controlled negative electrode and control chip; The other end of described reset paths starting switch (KR-4) is also connected with the zero line of power output end.

17. leakage current detection protection circuits according to claim 15, it is characterized in that: one end of described reset paths starting switch (KR-4) is connected with power input live wire, the other end is finally connected with the working power input pin of silicon controlled anode and control chip; The other end of described reset paths starting switch (KR-4) is also connected with the live wire of power output end.

18. according to the leakage current detection protection circuit described in claim 16 or 17, it is characterized in that: described simulation leakage current generating resistance (R5) is connected in parallel on the two ends of piezo-resistance (MOV) in circuit.

19. leakage current detection protection circuits according to claim 18, is characterized in that: described leakage current detection protection circuit also comprises the protective circuit resistance (R7) that an anti-power supply is threaded off and recoiled and hit;

The protective resistance (R7) that this anti-power supply dropout recoil is hit is connected between power input (LINE) live wire and power output end (LOAD) live wire; Or the protective resistance (R7) that this anti-power supply dropout recoil is hit is connected between power input (LINE) zero line and power output end (LOAD) zero line.