CN101388540B - Leakage protection circuit having life end detection and display functions - Google Patents
Leakage protection circuit having life end detection and display functions Download PDFInfo
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Abstract
The invention discloses a leakage current protector with the functions of life end detecting and displaying, which is characterized by comprising an analog leakage current generating circuit which can automatically generate analog leakage current without operating any components. A zero curve on the input end of a leakage current protector power supply is connected with an analog leakage current generating switch, an analogy leakage current and current-limiting resistance and a power supply input end live conductor which are interlocked with a reset push button to form the analogy leakage current generating circuit. A power supply output indicating lamp is connected between the live conductor and the zero curve on the power supply output end of the leakage current protector, a reset indicating lamp is connected in a silicon-controlled conducting return circuit in series, which is used to represent whether the life of a leakage current protecting socket is end or not or whether a power supply output state exists or not. A lightning metal plate for discharging is further connected on the input end of a power supply, and a live conductor on the input end of the power supply is connected with a power supply zero curve through a trip coil and a voltage dependent resistor. The invention has the advantages of complete function and excellent security, which can display the states of the leakage current socket in real time.
Description
Technical field
The present invention relates to a kind of leakage protection circuit that is applied in the earth leakage protective socket with detection of electrical leakage, defencive function; Specifically, the present invention relates to a kind of leakage protection circuit that any parts just can carry out life-span stop detection to earth leakage protective socket automatically and show testing result that after the power line in earth leakage protective socket power input and the wall connects, need not to operate.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 increasingly high 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 does not only have life end checking function; And; When its end-of-life, the prompt facility that concerning the user, has no, its SR 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 by error with the load output of earth leakage protective socket, under the situation of not pushing SR, 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 invention 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 SR, and after resetting, homing light extinguishes; The power supply output indicator is bright, explains 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, leakage protection circuit of the present invention did not work through homing light and representes this earth leakage protective socket end-of-life, the earth leakage protective socket of reminding the user in time more to renew.
Another object of the present invention 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 invention 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 by error 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 realizing above-mentioned purpose; The present invention adopts following technical scheme: 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 up of simulation leakage current generating switch, simulation leakage current current-limiting resistance, the tripping coil with the SR interlock;
Said 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 through 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 through simulation leakage current current-limiting resistance; Its normally opened contact links to each other with the zero line of power input through 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 SR 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 the homing light of end-of-life represent with being used to whether earth leakage protective socket has the power supply output indicator of power supply output;
Said 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 said 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 said simulation leakage current generating switch; When leakage protection circuit was in proper working order, along with the silicon controlled conducting, homing light was bright, explained that earth leakage protective socket has creepage protection function; Otherwise when leakage protection circuit can not be in proper working order, 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 said leakage protection circuit power input also links to each other with the zero line of power input through tripping coil, a piezo-resistance.
The present invention can also pass the power firestreak of said 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 said 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 the Test Switchboard and 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 through 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 through 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 has the leakage protection circuit physical circuit figure () of life-span stop detection and Presentation Function for the present invention;
Fig. 2 has the leakage protection circuit physical circuit figure (two) of life-span stop detection and Presentation Function for the present invention;
Fig. 3 has the leakage protection circuit physical circuit figure (three) of life-span stop detection and Presentation Function for the present invention.
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 present invention, and the difference of this leakage protection circuit and common leakage protection circuit is: leakage protection circuit disclosed by the invention has and after the power line in earth leakage protective socket power input and the wall connects, 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; 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, leakage protection circuit disclosed by the invention mainly by the differential differentiating transformer L1 (1000: 1) that is used for detecting leakage current, L2 (200: 1), control chip IC (RV4145), the tripping coil L3 (SOL) that is built-in with iron core, controllable silicon V4, with the simulation leakage current generating K switch R-1 of earth leakage protective socket SR RESET interlock, be connected on supply line and K switch R-2-1 SR RESET interlock, KR-2-2, KR-3-1, KR-3-2, reset switch KR-4, homing light V5, power supply output indicator V3 and simulation leakage current current-limiting resistance R4, R3 and diode that some are relevant, resistance, electric capacity etc. and form with SR RESET interlock.
After the live wire HOT of earth leakage protective socket power input LINE, zero line WHITE pass differential differentiating transformer L1, L2, link to each other through exporting the conduction sleeve with live wire, zero line in the surperficial single-phase three-wire power supply output plughole of earth leakage protective socket with K switch R-2-1, the KR-2-2 of reset switch RESET interlock; 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 link) LOAD through 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 through 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 SR 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 through tripping coil L3; Its normally-closed contact links to each other with the zero-power line WHITE that passes differential differentiating transformer L1, L2 through 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 SR RESET reset/or thread off through the mechanical trip gear in the earth leakage protective socket; Thereby make K switch R-2-1, KR-2-2, KR-3-1, KR-3-2 with SR RESET interlock closed/or break off; And the disconnection of simulation leakage current generating K switch R-1 normally-closed contact/or closed, the normally opened contact closure/or break off.
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 in proper working order; Element such as the controllable silicon V4, tripping coil L3, differential differentiating transformer L1, L2, the control chip IC that constitute leakage protection circuit are intact; Controllable silicon V4 is intact can normally the time; Along with the conducting of controllable silicon V4, homing light LED2 is bright, explains that earth leakage protective socket has creepage protection function; Otherwise; When leakage protection circuit can not be in proper working order, break down like one of the element controllable silicon V4 that constitutes leakage protection circuit, tripping coil L3, differential differentiating transformer L1, L2, control chip IC, 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 leakage protection circuit of the present invention 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 SR RESET interlock, formation need not to operate any parts can produce automatically one simulate leakage current simulation leakage current generating circuit.After the power input LINE of earth leakage protective socket and the power line in the wall connect; When SR RESET was in trip status and does not reset, promptly earth leakage protective socket was in initial condition, when SR 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 SR RESET interlock; Its live wire HOT and zero line WHITE with power input directly is communicated with, and produces 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.In proper working order when leakage protection circuit, detect this leakage current after, through mechanical component the normally-closed contact of simulation leakage current K switch R-1 is broken off, normally opened contact is closed, the simulation leakage current disappears, SR 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 SR when not resetting, because a pair of normally-closed contact of simulation leakage current generating K switch R-1 links to each other the live wire HOT of power input with the zero-power line WHITE that passes differential differentiating transformer L1, L2; 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 output signal to control chip IC, and the 5 pin output high-level control signal of control chip IC is given the gate pole of controllable silicon V4, and controllable silicon V4 is triggered; Positive pole and negative pole conducting have big electric current to flow through in the tripping coil L3, tripping coil L3 produces magnetic field; Its built-in iron core action makes SR RESET action through mechanical trip gear, and the normally opened contact of simulation leakage current generating K switch R-1 is closed; Normally-closed contact breaks off; The simulation leakage current disappears, and the homing light V5 that is connected between AB is bright, and expression earth leakage protective socket function is intact; Have creepage protection function, SR can reset.
Otherwise, if leakage protection circuit can't operate as normal, current leakage jack life termination, then not conducting of controllable silicon V4; All the time do not have big electric current to flow through in the tripping coil L3, can't produce magnetic field, its inner iron core is failure to actuate, and mechanical trip gear is failure to actuate all the time; SR can not be reset all the time, and homing light V5 does not work all the time, and 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 SR RESET, when the normally-closed contact of simulation leakage current generating K switch R-1 does not break off as yet, because reset switch KR-4 links with SR RESET; Reset switch KR-4 is closed; This moment is because the closure of KR-4 makes A point and B point short circuit, and it is last that the voltage at former AB two ends is added to 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, through mechanical trip gear SR 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 SR RESET action is broken off the normally-closed contact among the simulation leakage current K switch R-1 that links with it, the simulation leakage current disappears.After SR RESET resets, the K switch R-2-1 that links with it, KR-2-2; KR-3-1, KR-3-2 is closed, and 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 SR RESET, load end LOAD and receptacle face have electric power output, socket operate as normal.Owing to 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 this moment in the circuit when in the circuit leakage current generating is arranged; The voltage signal that differential differentiating transformer L1 and L2 induce certain value at once is input to IC, outputs a control signal to the gate pole of controllable silicon V4 from 5 pin of IC, and controllable silicon V4 is triggered; Positive pole and negative pole conducting are electronegative potential thereby make the positive pole place B point of controllable silicon V4, because the normally opened contact of K switch R-1 is a closure state at this moment; A point and B point are same point, and 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, and SR 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, and power supply output indicator V3 extinguishes, and homing light V5 is bright.
The present invention can also manually produce the simulation leakage current through 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 through 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 of interlock closed, 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 SR RESET can not reset.
In above various situation, must through the filtering of the anti-interference capacitor C 5 that being attempted by between silicon controlled gate pole and the ground from the control signal that 5 pin of IC are exported, suppress the generation of false triggering.
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, leakage protection circuit disclosed by the invention is connected with the lightning-arrest sheet metal M1 in a tip that is used to discharge, 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 through lightning-arrest sheet metal, and the residue sub-fraction consumes through tripping coil L3, piezo-resistance MOV, thereby has protected leakage protection circuit.
In specific embodiment of the present invention, said 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 present invention also has the defencive function that stops the reverse wiring mistake.As shown in the figure, link to each other through 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 SR RESET interlock; Between the live wire of the live wire of earth leakage protective socket input LINE, zero line and the single-phase three-wire supply hub of receptacle face, the zero line also is to link to each other through K switch R-2-1, KR-2-2 with SR RESET interlock; So; When the installer linked to each other the power line in the wall by error with earth leakage protective socket load output LOAD, the present invention need not to operate the circuit (normally-closed contact, resistance R 4, tripping coil SOL by simulation leakage current K switch R-1 constitute) that any parts can produce the simulation leakage current automatically can't produce leakage current, and control chip IC can't export control signal; Not conducting of controllable silicon V5; Do not have electric current to flow through in the tripping coil SOL, can't produce magnetic field and promote built-in iron core action wherein, mechanical trip gear is failure to actuate; Automatically stop SR to reset; All the time be in off-state with K switch R-2-1, KR-2-2, KR-3-1, the KR-3-2 of SR RESET interlock, 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 SR 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 embodiment of the invention 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: take shelter from the thunder sheet metal M1, M2 of the said tip that is used to discharge links to each other with the power firestreak HOT that passes differential differentiating transformer L1, L2, zero line WHITE respectively.
Fig. 3 is the embodiment of the invention 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 present invention adopts above technical scheme, so leakage protection circuit disclosed by the invention 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 SR; After resetting, V3 is bright for the power supply output indicator, and homing light V5 extinguishes, and explains 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 SR to reset, and 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 instantaneous pressure that anti-thunderbolt and other reasons cause 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 in proper working order, and when not having end-of-life, homing light V5 is bright, explains that earth leakage protective socket can operate as normal, and can reset that after, 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, and this earth leakage protective socket end-of-life is described, and stops SR 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 were connected to the power line in the wall on the earth leakage protective socket output by error, the present invention need not to operate the circuit that any parts can produce the simulation leakage current automatically can't produce leakage current, and control chip IC can't produce control signal; Not conducting of controllable silicon V4; Do not have electric current to flow through in the tripping coil L3, can't produce magnetic field and promote built-in iron core action wherein, mechanical trip gear can't move; Automatically stop SR 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 SR 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 present invention and the know-why used, and is any based on the equivalent transformation on the technical scheme of the present invention basis, all belongs within the protection range of the present invention.
Claims (9)
1. 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 up of simulation leakage current generating switch (KR-1), simulation leakage current current-limiting resistance (R4) and tripping coil (L3) with the SR interlock;
Said 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 leakage protection circuit power input through 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) through simulation leakage current current-limiting resistance (R4); Its normally opened contact links to each other with the zero line of leakage protection circuit power input through controllable silicon (V4);
The zero line of leakage protection circuit power input is through simulation leakage current current-limiting resistance (R4), link to each other with the live wire of leakage protection circuit power input with normally-closed contact, the tripping coil (L3) of the simulation leakage current generating switch (KR-1) of SR 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;
Said power supply output indicator (V3) 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, (V3) was bright for the power supply output indicator; Otherwise power supply output indicator (V3) does not work;
The anode of one end of said homing light (V5) and the controllable silicon (V4) in the leakage protection circuit
(B) link to each other, the other end links to each other with the common of said simulation leakage current generating switch (KR-1); When leakage protection circuit was in proper working order, along with the conducting of said controllable silicon (V4), (V5) was bright for homing light, explains that earth leakage protective socket has creepage protection function; Otherwise when leakage protection circuit can not be in proper working order, 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 and zero line place at the leakage protection circuit power input are connected with the lightning-arrest sheet metal (M1, M2) in a tip that is used to discharge respectively.
4. a kind of leakage protection circuit with life-span stop detection and Presentation Function according to claim 2 is characterized in that: be connected with the lightning-arrest sheet metal (M1, M2) in a tip that is used to discharge respectively at the power firestreak that passes said differential differentiating transformer (L1, L2), zero line place.
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 said leakage protection circuit power input also passes through tripping coil (L3), a piezo-resistance (MOV) links to each other with the zero line of leakage protection circuit 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 said leakage protection circuit power input passes behind the differential differentiating transformer (L1, L2) through tripping coil (L3), a piezo-resistance (MOV) and the zero-power line 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;
The circuit that should manually produce the simulation leakage current comprises Test Switchboard (KR-5) and the simulation leakage current current-limiting resistance (R3) that links with testing button; One end of Test Switchboard (KR-5) links to each other with the zero line of leakage protection circuit power input through 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.
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;
The circuit that should manually produce the simulation leakage current comprises the Test Switchboard (KR-5) that links with testing button; One end of Test Switchboard (KR-5) links to each other with the zero line of leakage protection circuit power input through 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 leakage protection circuit 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: said leakage protection circuit also comprises the said differential differentiating transformer (L1, L2), control chip, the said controllable silicon (V4) that are used for detecting leakage current, be connected on supply line and first, second, third, fourth switch (KR-2-1, KR-2-2, KR-3-1, KR-3-2) the SR interlock, with reset switch (KR-4), diode (V1) and the resistance (R1) of SR interlock;
After the live wire of leakage protection circuit power input, zero line pass said differential differentiating transformer (L1, L2), link to each other through exporting the conduction sleeve with live wire, zero line in the surperficial single-phase three-wire power supply output plughole of earth leakage protective socket with said first, second switch (KR-2-1, KR-2-2) of SR interlock; Simultaneously, the live wire in the single-phase three-wire power supply output plughole on earth leakage protective socket surface, zero line output conduction sleeve link to each other with live wire, the zero line of leakage protection circuit power output end through said the 3rd, the 4th switch (KR-3-1, KR-3-2) of another group with the reset switch interlock again;
The leakage current detection signal output of said differential differentiating transformer (L1, L2) links to each other with the signal input part (1,2,3,7) of said control chip, and the control signal output ends of said control chip (5) links to each other with the gate pole of said controllable silicon (V4); The working power input (6) of said control chip links to each other with the live wire of leakage protection circuit power input through diode (V1), resistance (R1), tripping coil (L3); The place of working pin (4) of said control chip links to each other with the zero line of leakage protection circuit power input;
The negative electrode of said controllable silicon (V4) links to each other with the zero line of leakage protection circuit power input, and the anode warp of said controllable silicon (V4) links to each other with the live wire of leakage protection circuit power input with reset switch (KR-4), the tripping coil (L3) of the normally open of SR interlock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101218329A CN101388540B (en) | 2007-09-14 | 2007-09-14 | Leakage protection circuit having life end detection and display functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101218329A CN101388540B (en) | 2007-09-14 | 2007-09-14 | Leakage protection circuit having life end detection and display functions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101388540A CN101388540A (en) | 2009-03-18 |
| CN101388540B true CN101388540B (en) | 2012-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007101218329A Expired - Fee Related CN101388540B (en) | 2007-09-14 | 2007-09-14 | Leakage protection circuit having life end detection and display functions |
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| CN (1) | CN101388540B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142671A (en) * | 2010-01-28 | 2011-08-03 | 黄华道 | Novel leakage protection circuit |
| CN102157916A (en) * | 2010-02-12 | 2011-08-17 | 黄华道 | Electric leakage detection and protection circuit |
| CN102208797B (en) * | 2010-03-29 | 2014-04-02 | 黄华道 | Novel protection circuit with electric leakage detection function |
| CN102377164B (en) * | 2010-08-06 | 2014-11-05 | 黄华道 | Energy-efficient leakage detection protection circuit |
| CN102832591B (en) * | 2011-06-17 | 2016-09-07 | 黄华道 | There is the leakage current detection protection circuit of lightning impulse resistant function |
| CN102332700B (en) * | 2011-09-14 | 2014-01-08 | 黄华道 | Anti-lightning leakage detection and protection circuit |
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2007
- 2007-09-14 CN CN2007101218329A patent/CN101388540B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101388540A (en) | 2009-03-18 |
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