CN201113383Y - Earth leakage protective circuit possessing end-to-life detection and display function - Google Patents

Abstract

The utility model discloses an electric leakage protection circuit with life end detection function and display function. The utility model is characterized in that: the electric leakage protection circuit comprises an analog leakage current generating circuit which can automatically generate analog leakage current without operating any part; the zero line of the power source input end of the electric leakage protection circuit is connected with the live line of the power source input end through an analog leakage current generating switch and an analog leakage current current-limiting resistor which are in linkage with a reset button, thereby forming the analog leakage current generating circuit; the utility model connects a power source output indicator light between the live line and the zero line of the power source output end of the electric leakage protection circuit; a reset indicator light is connected in series with a silicon control conduction circuit to indicate whether an electric leakage protection socket is used out or is in a power source output state; the power source input end is also connected with a lightning-proof sheet metal used for discharge; and the live line of the power source input end is connected with the zero line of a power source through a tripping coil and a voltage dependent resistor. The electric leakage protection circuit which has complete functions and high safety can realize realtime display of the state of the electric leakage protection socket.

Description

Leakage protection circuit with life-span stop detection and Presentation Function

Technical field

The utility model relates to a kind of leakage protection circuit with detection of electrical leakage, defencive function that is applied in the earth leakage protective socket; specifically, the utility model relates to and need not to operate the leakage protection circuit that any parts just can carry out life-span stop detection to earth leakage protective socket automatically and show testing result after a kind of power line in earth leakage protective socket power input and wall connects.This leakage protection circuit is also to having protective effect owing to the instantaneous pressure that is struck by lightning or other reasons causes to the destruction that earth leakage protective socket causes; And has a function that stops the reverse wiring mistake.

Background technology

Along with the continuous development of earth leakage protective socket (being called for short GFCI) industry, people require more and more higher to the safety in utilization of earth leakage protective socket.Hope when its inner components and parts lost efficacy the forfeiture creepage protection function when its end-of-life, can in time be reminded the user in the use of earth leakage protective socket, change new product.

Yet; its inner leakage protection circuit of common in the market earth leakage protective socket; not only do not have life end checking function; and; when its end-of-life, concerning the user without any prompt facility, its reset button still can reset; the single-phase three-wire power supply output plughole of the load output of earth leakage protective socket and receptacle face still has power supply output, misleads the user and continues to use.When leaky occurring,, very easily cause the get an electric shock generation of dead accident of user because this earth leakage protective socket do not have any protective effect.

In addition, common in the market its inner leakage protection circuit of earth leakage protective socket does not also have the function that stops the reverse wiring mistake.When the installer linked to each other the power line in the wall mistakenly with the load output of earth leakage protective socket, under the situation of not pushing reset button, the single-phase three-wire power supply output plughole on earth leakage protective socket surface promptly had power supply output.When leaky appears in electrical appliance work, because not work of leakage current detection protection circuit,, very easily cause the get an electric shock generation of dead accident of user so this earth leakage protective socket does not have any protective effect.

Summary of the invention

In view of the foregoing, main purpose of the present utility model provide a kind of be applied in the earth leakage protective socket, after the power input of earth leakage protective socket and the power line in the wall connect, need not to operate any parts and just can whether still have the leakage protection circuit that creepage protection function detected and showed testing result to earth leakage protective socket automatically.When the earth leakage protective socket inner member is intact when not having end-of-life, this leakage protection circuit can make homing light bright, expression can be set up correct reset mechanism automatically can reset reset button, after resetting, homing light extinguishes, the power supply output indicator is bright, illustrates that earth leakage protective socket can operate as normal; When earth leakage protective socket inner member open circuit or short circuit were end-of-life, the utility model leakage protection circuit did not work by homing light and represents this earth leakage protective socket end-of-life, the earth leakage protective socket of reminding the user in time more to renew.

Another purpose of the present utility model provides a kind of leakage protection circuit that the destruction that earth leakage protective socket is caused owing to the instantaneous pressure that is struck by lightning or other reasons causes is had protective effect.

Another purpose of the present utility model provides a kind of leakage protection circuit that stops reverse wiring mistake function that has; when the installer links to each other the power line in the wall mistakenly with earth leakage protective socket load output; this leakage protection circuit is not worked, and the power supply output plughole of the power input of earth leakage protective socket and receptacle face does not all have power supply output.

For achieving the above object, the utility model is by the following technical solutions: a kind of leakage protection circuit with life-span stop detection and Presentation Function is characterized in that: this leakage protection circuit includes one and need not to operate the simulation leakage current generating circuit that any parts can produce the simulation leakage current automatically;

This simulation leakage current generating circuit is made of simulation leakage current generating switch, simulation leakage current current-limiting resistance, the tripping coil with the reset button interlock;

Described simulation leakage current generating switch has a pair of normally-closed contact and a pair of normally opened contact; Its common links to each other with the live wire of power input by the tripping coil that is built-in with iron core; Its normally-closed contact links to each other with the zero-power line that passes differential differentiating transformer by simulation leakage current current-limiting resistance; Its normally opened contact links to each other with the zero line of power input by controllable silicon;

The zero line of earth leakage protective socket power input is through simulation leakage current current-limiting resistance, link to each other with the live wire of power input with normally-closed contact, the tripping coil of the simulation leakage current switch of reset button interlock, constitutes this and need not to operate any parts and can produce the simulation leakage current generating circuit of simulating leakage current automatically.

This leakage protection circuit also include be used to represent earth leakage protective socket whether end-of-life homing light and be used to represent whether earth leakage protective socket has the power supply output indicator of power supply output;

Described power supply output indicator is connected between the live wire and zero line of leakage protection circuit power output end; When earth leakage protective socket had power supply output, the power supply output indicator was bright; Otherwise the power supply output indicator does not work;

One end of described homing light links to each other with silicon controlled anode in the leakage protection circuit, and the other end links to each other with the common port of described simulation leakage current generating switch; When leakage protection circuit was working properly, along with the silicon controlled conducting, homing light was bright, illustrated that earth leakage protective socket has creepage protection function; Otherwise when leakage protection circuit can not be working properly, during leakage protection circuit end-of-life forfeiture creepage protection function, homing light does not work, and shows leakage protection circuit end-of-life, the earth leakage protective socket of reminding the user in time more to finish changing.

Live wire and zero line place at the leakage protection circuit power input are connected with a lightning-arrest sheet metal that is used to discharge respectively.The live wire of described leakage protection circuit power input also links to each other with the zero line of power input through tripping coil, a piezo-resistance.

The utility model can also pass the power firestreak of described differential differentiating transformer, the zero line place is connected with a lightning-arrest sheet metal that is used to discharge respectively.The live wire of described power input links to each other with the zero-power line that passes differential differentiating transformer through tripping coil, a piezo-resistance after passing differential differentiating transformer.

This leakage protection circuit also comprises a circuit that manually produces the simulation leakage current; The circuit that should manually produce the simulation leakage current comprises Test Switchboard and the simulation leakage current current-limiting resistance that links with testing button; One end of Test Switchboard links to each other with the power input zero line by simulation leakage current current-limiting resistance, and the other end links to each other with the live wire of leakage protection circuit power output end.

The circuit that should manually produce the simulation leakage current can also include only the Test Switchboard that links with testing button; One end of Test Switchboard links to each other with the power input zero line by the simulation leakage current current-limiting resistance in the simulation leakage current generating circuit that produces the simulation leakage current automatically, and the other end links to each other with the live wire of earth leakage protective socket power output end.

Description of drawings

Fig. 1 is the leakage protection circuit physical circuit figure () that the utlity model has life-span stop detection and Presentation Function;

Fig. 2 is the leakage protection circuit physical circuit figure (two) that the utlity model has life-span stop detection and Presentation Function;

Fig. 3 is the leakage protection circuit physical circuit figure (three) that the utlity model has life-span stop detection and Presentation Function.

Embodiment

Fig. 1 is applied to the leakage protection circuit with detection of electrical leakage, defencive function in the earth leakage protective socket for the utility model, and the difference of this leakage protection circuit and common leakage protection circuit is: the disclosed leakage protection circuit of the utility model has need not to operate the function that any parts just can carry out life-span stop detection to earth leakage protective socket automatically and show testing result after the power line in earth leakage protective socket power input and the wall connects; To the destruction that earth leakage protective socket causes being had defencive function owing to the instantaneous pressure that is struck by lightning or other reasons causes; And, also have the function that stops the reverse wiring mistake.

As shown in Figure 1, the disclosed leakage protection circuit of the utility model is mainly by the differential differentiating transformer L1 (1000: 1) that is used to detect leakage current; L2 (200: 1); control chip IC (RV4145); be built-in with the tripping coil L3 (SOL) of iron core; controllable silicon V4; simulation leakage current generating K switch R-1 with earth leakage protective socket reset button RESET interlock; be connected in the supply line and K switch R-2-1 reset button RESET interlock; KR-2-2; KR-3-1; KR-3-2; reset switch KR-4 with reset button RESET interlock; homing light V5; power supply output indicator V3 and simulation leakage current current-limiting resistance R4; R3 and the diode that some are relevant; resistance; compositions such as electric capacity.

After the live wire HOT of earth leakage protective socket power input LINE, zero line WHITE pass differential differentiating transformer L1, L2, by linking to each other with live wire, zero line output conduction sleeve in the single-phase three-wire power supply output plughole on K switch R-2-1, the KR-2-2 of reset switch RESET interlock and earth leakage protective socket surface; Simultaneously, the output of live wire HOT, the zero line WHITE in the single-phase three-wire power supply output plughole on earth leakage protective socket surface conduction sleeve links to each other with live wire HOT, the zero line WHITE of earth leakage protective socket power output end (load link) LOAD by K switch R-3-1, the KR-3-2 of another group with reset switch RESET interlock again.

The leakage current detection signal output of differential differentiating transformer L1, L2 links to each other with the signal input part 1,2,3,7 of control chip IC, and the control signal output ends 5 of control chip IC links to each other with the gate pole of controllable silicon V4.The working power input 6 of control chip IC links to each other with the live wire HOT of earth leakage protective socket power input LINE by diode V1, resistance R 1, tripping coil L3.The place of working pin 4 of control chip IC links to each other with the zero line WHITE of earth leakage protective socket power input LINE.

The negative electrode of controllable silicon V4 links to each other with the zero line WHITE of earth leakage protective socket power input LINE, and the anode warp of controllable silicon V4 links to each other with power input live wire HOT with reset switch KR-4, the tripping coil L3 of the normally open of reset button RESET interlock; Simultaneously, the anode of controllable silicon V4 also links to each other with the normally opened contact of simulation leakage current generating K switch R-1.

Simulation leakage current generating K switch R-1 is a switch that has a pair of normally-closed contact and a pair of normally opened contact, and its common A links to each other with the live wire HOT of earth leakage protective socket power input LINE by tripping coil L3; Its normally-closed contact links to each other with the zero-power line WHITE that passes differential differentiating transformer L1, L2 by simulation leakage current current-limiting resistance R4; Its normally opened contact B links to each other with the anode of controllable silicon V4.

The iron core that is built in the tripping coil L3 makes reset button RESET reset/or thread off by the mechanical trip gear in the earth leakage protective socket; thereby make and K switch R-2-1, the KR-2-2 of reset button RESET interlock, KR-3-1, KR-3-2 closure/or disconnect; and the disconnection of simulation leakage current generating K switch R-1 normally-closed contact/or closed, the normally opened contact closure/or disconnect.

Between the live wire of earth leakage protective socket power output end LOAD and zero line, be connected with one and be used to represent whether earth leakage protective socket has the power supply output indicator LED1 (V3) of power supply output.When earth leakage protective socket had power supply output, LED1 was bright; Otherwise LED1 does not work.

Be connected with one between the common port A of the anode B of controllable silicon V4 in leakage protection circuit and simulation leakage current generating K switch R-1 and be used to represent the whether homing light LED2 (V5) of end-of-life of earth leakage protective socket.When leakage protection circuit working properly, constitute the element of leakage protection circuit such as controllable silicon V4, tripping coil L3, differential differentiating transformer L1, L2, control chip IC is intact, controllable silicon V4 is intact can normally the time, conducting along with controllable silicon V4, homing light LED2 is bright, illustrates that earth leakage protective socket has creepage protection function; Otherwise; when leakage protection circuit can not be working properly; as one of element controllable silicon V4, tripping coil L3, differential differentiating transformer L1, L2, control chip IC of constituting leakage protection circuit break down; when causing leakage protection circuit end-of-life forfeiture creepage protection function; because leakage protection circuit can't form the loop; homing light LED2 do not work, and shows leakage protection circuit end-of-life, the earth leakage protective socket of reminding the user in time more to finish changing.

The power input zero line WHITE that constitutes the utility model leakage protection circuit is through simulation leakage current current-limiting resistance R4, link to each other with power input live wire HOT with normally-closed contact, the tripping coil L3 (SOL) of the simulation leakage current K switch R-1 of reset button RESET interlock, and formation need not to operate any parts can produce a simulation leakage current generating circuit of simulating leakage current automatically.After the power input LINE of earth leakage protective socket and the power line in the wall connect; when reset button RESET is in trip status and does not reset; be that earth leakage protective socket is in initial condition; when reset button RESET is not pressed; owing to be in closure state with the normally-closed contact of the simulation leakage current generating K switch R-1 of reset button RESET interlock; its live wire HOT and zero line WHITE with power input directly is communicated with; produce the simulation leakage current; so; after the power input of earth leakage protective socket and the power line in the wall connect, need not to operate the above-mentioned simulation leakage current generating of any parts circuit and can produce a simulation leakage current automatically.Working properly when leakage protection circuit, detect this leakage current after, by mechanical component the normally-closed contact of simulation leakage current K switch R-1 is disconnected, the normally opened contact closure, the simulation leakage current disappears, reset button RESET resets.

As shown in Figure 1; when the power input of earth leakage protective socket and the power supply in the wall connect the back reset button when not resetting; because a pair of normally-closed contact of simulation leakage current generating K switch R-1 is with the live wire HOT of power input and pass differential differentiating transformer L1; the zero-power line WHITE of L2 links to each other; so; need not to operate the above-mentioned simulation leakage current generating of any parts circuit and can produce the simulation leakage current automatically; leakage current flows through differential differentiating transformer L1; L2; differential differentiating transformer L1; L2 outputs signal to control chip IC; the 5 pin output high-level control signal of control chip IC is given the gate pole of controllable silicon V4; controllable silicon V4 is triggered; positive pole and negative pole conducting; there is big electric current to flow through in the tripping coil L3; tripping coil L3 produces magnetic field; its built-in iron core action; make reset button RESET action by mechanical trip gear; the normally opened contact closure of simulation leakage current generating K switch R-1; normally-closed contact disconnects; the simulation leakage current disappears; the homing light V5 that is connected between AB is bright; expression earth leakage protective socket function is intact; have creepage protection function, reset button can reset.

Otherwise, if leakage protection circuit can't operate as normal, current leakage jack life termination; then not conducting of controllable silicon V4 does not have big electric current to flow through all the time in the tripping coil L3, can't produce magnetic field; its inner iron core is failure to actuate; the machinery trip gear is failure to actuate all the time, and reset button can not be reset all the time, and homing light V5 does not work all the time; power supply output indicator V3 does not work yet; thereby prompting user this earth leakage protective socket is end-of-life, the earth leakage protective socket that should more finish changing.

When pressing reset button RESET, when the normally-closed contact of simulation leakage current generating K switch R-1 does not disconnect as yet, because reset switch KR-4 and reset button RESET interlock, reset switch KR-4 closure, this moment is because the closure of KR-4 makes A point and B point short circuit, and the voltage at former AB two ends is added on tripping coil (SOL) L3, and making has certain electric current to flow through and produce magnetic field in the tripping coil, inner iron core is done ballistic motion, by mechanical trip gear reset button can be resetted; The light-emitting diode V5 that is connected between A point, B point is in cut-off state, and the V5 lamp goes out; Simultaneously, because reset button RESET action disconnects the normally-closed contact among the simulation leakage current K switch R-1 that links with it, the simulation leakage current disappears.After reset button RESET resets, Lian Dong K switch R-2-1 with it, KR-2-2; KR-3-1, the KR-3-2 closure, earth leakage protective socket has power supply output; V3 is bright for the power supply output indicator, shows that the single-phase three-wire jack of receptacle face and load output all have power supply output.

When the earth leakage protective socket function is intact, after earth leakage protective socket correctly inserts power supply, press reset button RESET, load end LOAD and receptacle face have electric power output, socket operate as normal.This moment is when having leakage current generating in the circuit, because power firestreak HOT and zero line WHITE pass differential differentiating transformer L1 (1000: 1) and the L2 (200: 1) that is used to detect leakage current simultaneously, pass current phasor in two power lines of differential differentiating transformer L1 and L2 and non-vanishing in the circuit, the voltage signal that differential differentiating transformer L1 and L2 induce certain value at once is input to IC, output a control signal to the gate pole of controllable silicon V4 from 5 pin of IC, controllable silicon V4 is triggered, positive pole and negative pole conducting, thereby making the positive pole place B point of controllable silicon V4 is electronegative potential, because this moment, the normally opened contact of K switch R-1 was a closure state, A point and B point are same point, because of the other end of tripping coil L3 links to each other with power firestreak, the two ends of tripping coil L3 will obtain the voltage of certain value, there is certain electric current to flow through, produce magnetic field, its inner iron core is done ballistic motion, reset button RESET is threaded off, the output of cutting off the electricity supply, the normally opened contact of K switch R-1 becomes off-state by closure state, power supply output indicator V3 extinguishes, and homing light V5 is bright.

The utility model can also manually produce the simulation leakage current by pushing testing button TEST, detects whether end-of-life of earth leakage protective socket.As shown in Figure 1, link to each other with power input zero line WHITE by simulating leakage current current-limiting resistance R3 with the end of the Test Switchboard KR-5 of testing button TEST interlock, the other end links to each other with the live wire of earth leakage protective socket power output end LOAD.

When whether just often detecting the earth leakage protective socket function, can push testing button TEST, make with it the Test Switchboard KR-5 closure of interlock, produce the simulation leakage current, detect whether end-of-life of earth leakage protective socket.If leakage protection circuit can't operate as normal, current leakage jack life termination, then homing light V5 does not work, and reset button RESET can not reset.

In above various situations, the control signal of exporting from 5 pin of IC must suppress the generation of false triggering through being attempted by the filtering of the anti-interference capacitor C 5 between silicon controlled gate pole and the ground.

In order to improve the useful life of earth leakage protective socket; avoid because the destruction that the instantaneous pressure that thunderbolt or other reasons cause causes earth leakage protective socket; as shown in Figure 1, the disclosed leakage protection circuit of the utility model is connected with a tip that is used to discharge lightning-arrest sheet metal M1, M2 respectively at live wire HOT and the zero line WHITE place of power input LINE.In addition, the live wire HOT of power input also links to each other with the zero line WHITE of power input through tripping coil L3, a piezo-resistance MOV.

When the live wire of power input and zero line because thunderbolt or other reasons when causing instantaneous pressure; the air dielectric that is connected to the lightning-arrest sheet metal in tip at input live wire place and is connected between the lightning-arrest sheet metal in tip at input zero line place is breakdown; form atmospherical discharges; most of high pressure consumes by lightning-arrest sheet metal; the residue sub-fraction consumes by tripping coil L3, piezo-resistance MOV, thereby has protected leakage protection circuit.

In specific embodiment of the utility model, described piezo-resistance MOV selects surge inhibition type piezo-resistance for use, makes it can also play the effect that prevents electrophoresis.

As shown in Figure 1, the utility model also has the defencive function that stops the reverse wiring mistake.As shown in the figure, link to each other by K switch R-3-1, KR-3-2 between the single-phase three-wire supply hub of earth leakage protective socket load output LOAD and receptacle face with reset button RESET interlock; The live wire of earth leakage protective socket input LINE; the live wire of the single-phase three-wire supply hub of zero line and receptacle face; between the zero line also be by with the K switch R-2-1 of reset button RESET interlock; KR-2-2 links to each other; so; when the installer links to each other the power line in the wall mistakenly with earth leakage protective socket load output LOAD; the utility model need not to operate circuit that any parts can produce the simulation leakage current automatically (by the normally-closed contact of simulation leakage current K switch R-1; resistance R 4; tripping coil SOL constitutes) can't produce leakage current; control chip IC can't export control signal; not conducting of controllable silicon V5; there is not electric current to flow through in the tripping coil SOL; can't produce magnetic field and promote built-in iron core action wherein; the machinery trip gear is failure to actuate; automatically stop reset button to reset; K switch R-2-1 with reset button RESET interlock; KR-2-2; KR-3-1; KR-3-2 is in off-state all the time; can't be closed; the equal non-transformer output of the input LINE of earth leakage protective socket and the supply hub of receptacle face; homing light V5 and power supply output indicator V3 all do not work, and show wiring error.After the erector had only wiring correct, homing light V5 was just bright, and reset button just can reset, and power supply output indicator V3 is just bright, and the earth leakage protective socket power output end just has power supply output.

Fig. 2 is the utility model embodiment two leakage protection circuit physical circuit figure.Its operation principle is identical with the leakage protection circuit of embodiment 1 shown in Figure 1.Leakage protection circuit shown in Figure 2 is with the difference of leakage protection circuit shown in Figure 1: the described tip that is used to discharge lightning-arrest sheet metal M1, M2 link to each other with the power firestreak HOT that passes differential differentiating transformer L1, L2, zero line WHITE respectively.

Fig. 3 is the utility model embodiment three leakage protection circuit physical circuit figure.Its operation principle is identical with the leakage protection circuit of embodiment 2 shown in Figure 2.The leakage protection circuit shown in Figure 3 and the difference of leakage protection circuit shown in Figure 1 are: need not to operate any parts and can produce the simulation leakage current generating circuit of simulation leakage current and the shared simulation leakage current current-limiting resistance R4 of simulation leakage current generating circuit of manual test generation simulation leakage current automatically.The power firestreak HOT that passes differential differentiating transformer L1, L2 links to each other with the zero-power line WHITE that passes differential differentiating transformer L1, L2 through tripping coil L3, a piezo-resistance MOV.

In sum, because the utility model adopts above technical scheme, so the disclosed leakage protection circuit of the utility model has following outstanding advantage:

(1) after the power line in earth leakage protective socket power input and the wall connects; need not to operate any parts; just can produce the simulation leakage current automatically, detect earth leakage protective socket and whether still have the i.e. end-of-life whether of creepage protection function, and show testing result.

A. intact when the element that constitutes leakage protection circuit, when leakage protection circuit does not have end-of-life, homing light V5 is bright, expression can be set up correct reset mechanism automatically can reset reset button; After resetting, V3 is bright for the power supply output indicator, and homing light V5 extinguishes, and illustrates that earth leakage protective socket can operate as normal;

B. when the element open circuit that constitutes leakage protection circuit or short circuit are end-of-life; homing light V5 does not work; represent this leakage protection circuit end-of-life; and stop reset button to reset; make the load output of earth leakage protective socket and the single-phase three-wire power supply output plughole of receptacle face all not have power supply output, power supply output indicator V3 does not work.

So, the state that the user can pass through homing light V5, power supply output indicator V3 judge earth leakage protective socket whether end-of-life with and operating state.

(2), the defencive function that has the destruction that anti-lightning strike and instantaneous pressure that other reasons causes causes earth leakage protective socket.

(3) has manual detection and show the function of testing result

A. produce leakage current when manual simulation, leakage protection circuit is working properly, and when not having end-of-life, homing light V5 is bright, illustrates that earth leakage protective socket can operate as normal, and can reset that after resetting, homing light V5 goes out, and V3 is bright for the power supply output indicator;

B. produce leakage current when manually simulating; during the leakage protection circuit end-of-life; homing light V5 does not work; this earth leakage protective socket end-of-life is described; and stop reset button to reset; make the load output of earth leakage protective socket and the single-phase three-wire power supply output plughole of receptacle face all not have power supply output, power supply output indicator V3 does not work.

(4) has the defencive function that stops the reverse wiring mistake.

When erector or electrician are connected to the power line in the wall on the earth leakage protective socket output mistakenly; the utility model need not to operate the circuit that any parts can produce the simulation leakage current automatically can't produce leakage current; control chip IC can't produce control signal; not conducting of controllable silicon V4; there is not electric current to flow through in the tripping coil L3; can't produce magnetic field and promote built-in iron core action wherein; the machinery trip gear can't move; automatically stop reset button to reset; the output of socket non-transformer; homing light V5 does not work, and shows wiring error.After the erector had only wiring correct, homing light V5 was just bright, and reset button just can reset, and the earth leakage protective socket power output end just has power supply output, and power supply output indicator V3 is just bright.

The above is specific embodiment of the utility model and the know-why used, and is any based on the equivalent transformation on the technical solutions of the utility model basis, all belongs within the utility model protection range.

Claims (9)

1, a kind of leakage protection circuit with life-span stop detection and Presentation Function is characterized in that: this leakage protection circuit includes one and need not to operate the simulation leakage current generating circuit that any parts can produce the simulation leakage current automatically;

This simulation leakage current generating circuit is made of simulation leakage current generating switch (KR-1), simulation leakage current current-limiting resistance (R4), the tripping coil (L3) with reset button (RESET) interlock;

Described simulation leakage current generating switch (KR-1) has a pair of normally-closed contact and a pair of normally opened contact; Its common links to each other with the live wire of power input by the tripping coil (L3) that is built-in with iron core; Its normally-closed contact links to each other with the zero-power line that passes differential differentiating transformer (L1, L2) by simulation leakage current current-limiting resistance (R4); Its normally opened contact links to each other with the zero line of power input by controllable silicon (V4);

The zero line of earth leakage protective socket power input (WHITE) is through simulation leakage current current-limiting resistance (R4), link to each other with the live wire (HOT) of power input with normally-closed contact, the tripping coil (L3) of the simulation leakage current switch (KR-1) of reset button (RESET) interlock, constitutes this and need not to operate any parts and can produce the simulation leakage current generating circuit of simulating leakage current automatically.

2, a kind of leakage protection circuit with life-span stop detection and Presentation Function according to claim 1 is characterized in that: this leakage protection circuit also include be used to represent earth leakage protective socket whether end-of-life homing light (V5) and be used to represent whether earth leakage protective socket has the power supply output indicator (V3) of power supply output;

Described power supply output indicator (V3) is connected between the live wire and zero line of leakage protection circuit power output end (LOAD); When earth leakage protective socket had power supply output, (V3) was bright for the power supply output indicator; Otherwise power supply output indicator (V3) does not work;

The anode (B) of the controllable silicon (V4) in one end of described homing light (V5) and the leakage protection circuit links to each other, and the other end links to each other with the common port (A) of described simulation leakage current generating switch (KR-1); When leakage protection circuit was working properly, along with the conducting of controllable silicon (V4), (V5) was bright for homing light, illustrates that earth leakage protective socket has creepage protection function; Otherwise when leakage protection circuit can not be working properly, during leakage protection circuit end-of-life forfeiture creepage protection function, homing light (V5) does not work, and shows leakage protection circuit end-of-life, the earth leakage protective socket of reminding the user in time more to finish changing.

3, a kind of leakage protection circuit with life-span stop detection and Presentation Function according to claim 2 is characterized in that: live wire (HOT) and zero line (WHITE) at leakage protection circuit power input (LINE) locate to be connected with respectively the lightning-arrest sheet metal (M1, M2) in a tip that is used to discharge.

4, a kind of leakage protection circuit with life-span stop detection and Presentation Function according to claim 2 is characterized in that: locate to be connected with respectively the lightning-arrest sheet metal (M1, M2) in a tip that is used to discharge at the power firestreak (HOT) that passes described differential differentiating transformer (L1, L2), zero line (WHITE).

5, according to claim 3 or 4 described a kind of leakage protection circuits with life-span stop detection and Presentation Function, it is characterized in that: the live wire of described leakage protection circuit power input (HOT) also passes through tripping coil (L3), a piezo-resistance (MOV) links to each other with the zero line (WHITE) of power input.

6, according to claim 3 or 4 described a kind of leakage protection circuits with life-span stop detection and Presentation Function, it is characterized in that: the live wire of described power input (HOT) passes behind the differential differentiating transformer (L1, L2) through tripping coil (L3), a piezo-resistance (MOV) and the zero-power line (WHITE) that passes differential differentiating transformer (L1, L2) and links to each other.

7, according to claim 1 or 2 or 3 or 4 described a kind of leakage protection circuits with life-span stop detection and Presentation Function, it is characterized in that: this leakage protection circuit also comprises a circuit that manually produces the simulation leakage current;

Be somebody's turn to do the circuit that manually produces the simulation leakage current and comprise Test Switchboard (KR-5) and the simulation leakage current current-limiting resistance (R3) that links with testing button (TEST); One end of Test Switchboard (KR-5) links to each other with power input zero line (WHITE) by simulation leakage current current-limiting resistance (R3), and the other end links to each other with the live wire of leakage protection circuit power output end (LOAD).

8, according to claim 1 or 2 or 3 or 4 described a kind of leakage protection circuits with life-span stop detection and Presentation Function, it is characterized in that: this leakage protection circuit also comprises a circuit that manually produces the simulation leakage current;

Be somebody's turn to do the circuit that manually produces the simulation leakage current and comprise the Test Switchboard (KR-5) that links with testing button (TEST); One end of Test Switchboard (KR-5) links to each other with power input zero line (WHITE) by the simulation leakage current current-limiting resistance (R4) in the simulation leakage current generating circuit that produces the simulation leakage current automatically, and the other end links to each other with the live wire of earth leakage protective socket power output end.

9, a kind of leakage protection circuit with life-span stop detection and Presentation Function according to claim 1 is characterized in that: described leakage protection circuit is by the differential differentiating transformer that is used for detecting leakage current (L1, L2), control chip (IC), the tripping coil (L3) that is built-in with iron core, controllable silicon (V4), that be connected on supply line with first, second, third, fourth switch (KR-2-1, KR-2-2, KR-3-1, KR-3-2) reset button (RESET) interlock, form with the reset switch (KR-4) of reset button (RESET) interlock;

After the live wire (HOT) of earth leakage protective socket power input (LINE), zero line (WHITE) pass differential differentiating transformer (L1, L2), by linking to each other with live wire, zero line output conduction sleeve in the single-phase three-wire power supply output plughole on first, second switch (KR-2-1, KR-2-2) of reset button (RESET) interlock and earth leakage protective socket surface; Simultaneously, the live wire (HOT) in the single-phase three-wire power supply output plughole on earth leakage protective socket surface, zero line (WHITE) output conduction sleeve link to each other with live wire (HOT), the zero line (WHITE) of earth leakage protective socket power output end (LOAD) by the 3rd, the 4th switch (KR-3-1, KR-3-2) of another group with reset switch (RESET) interlock again;

The leakage current detection signal output of differential differentiating transformer (L1, L2) links to each other with the signal input part (1,2,3,7) of control chip (IC), and the control signal output ends (5) of control chip (IC) links to each other with the gate pole of controllable silicon (V4); The working power input (6) of control chip (IC) links to each other with the live wire (HOT) of earth leakage protective socket power input (LINE) by diode (V1), resistance (R1), tripping coil (L3); The place of working pin (4) of control chip (IC) links to each other with the zero line (WHITE) of earth leakage protective socket power input (LINE);

The negative electrode of controllable silicon (V4) links to each other with the zero line (WHITE) of earth leakage protective socket power input (LINE), and the anode warp of controllable silicon (V4) links to each other with power input live wire (HOT) with reset switch (KR-4), the tripping coil (L3) of the normally open of reset button (RESET) interlock.

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