CN201466675U - Leakage detection protection circuit - Google Patents

Leakage detection protection circuit Download PDF

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Publication number
CN201466675U
CN201466675U CN2009201095766U CN200920109576U CN201466675U CN 201466675 U CN201466675 U CN 201466675U CN 2009201095766 U CN2009201095766 U CN 2009201095766U CN 200920109576 U CN200920109576 U CN 200920109576U CN 201466675 U CN201466675 U CN 201466675U
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leakage current
protection circuit
current detection
detection protection
output end
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CN2009201095766U
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Chinese (zh)
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黄华道
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Individual
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Abstract

The utility model discloses a leakage detection protection circuit, which at least comprises power supply switches KR-2-1 and KR-2-2, a disengaging coil with a built-in iron core and a controllable silicon, wherein the power supply switches KR-2-1 and KR-2-2, the disengaging coil with the built-in iron core and the controllable silicon are connected with a power supply main loop in serial; and a fire line and a zero line on the power supply input end LINE of the leakage detection protection circuit are respectively connected with a fire line and a zero line of the power supply output end LOAD through the power supply switches KR-2-1 and KR-2-2; and is characterized in that one end of the disengaging coil with the built-in iron core is connected with the fire line on the power supply output end LOAD of the leakage detection protection circuit. The leakage detection protection circuit is electrified to work only by pressing the return spring or after the return spring is returned, so the service life of the leakage detection protection circuit is prolonged.

Description

Leakage current detection protection circuit
Technical field
The utility model relates to a kind of circuit with detection of electrical leakage, defencive function that is installed in attaching plug/supply socket.
Background technology
Along with the continuous development of the attaching plug with creepage protection function/supply socket industry, people are to the function of attaching plug/supply socket with creepage protection function, safety in utilization, reliability, useful life etc. requiring more and more higher.This makes that the insider constantly is devoted to study, improve the leakage current detection protection circuit that is installed in attaching plug/supply socket, makes more succinct, the with better function strength of its circuit, uses safer, more reliable, the longer service life of work.
Summary of the invention
In view of the foregoing, main purpose of the present utility model provides a kind of new pattern creepage detection protective circuit in attaching plug/supply socket, long service life that is installed in.
Another purpose of the present utility model provides a kind of to because the destruction that thunderbolt or the instantaneous pressure that causes of other reasons cause attaching plug/supply socket and the miscellaneous equipment that links to each other with attaching plug/supply socket has the leakage current detection protection circuit of protective effect.
For achieving the above object, the utility model by the following technical solutions: a kind of leakage current detection protection circuit which comprises at least the mains switch that is connected in the main circuit power supply, the tripping coil that is built-in with iron core, controllable silicon;
The live wire of leakage current detection protection circuit power input LINE, zero line link to each other with live wire, the zero line of power output end through described mains switch respectively; It is characterized in that:
A described end that is built-in with the tripping coil of iron core links to each other with the live wire of leakage current detection protection circuit power output end.
The place of working of this leakage current detection protection circuit links to each other with the zero line of power output end through lead.
In preferred embodiment of the present utility model, this leakage current detection protection circuit also comprises at least one pair of normal open switch;
One end of described tripping coil links to each other with the live wire of leakage current detection protection circuit power output end, simultaneously, an end of tripping coil also links to each other with power firestreak from magnetic test coil with induction coil in passing leakage current detection protection circuit by a described normal open switch;
The place of working of this leakage current detection protection circuit links to each other with the zero line of power output end, simultaneously, the place of working of leakage current detection protection circuit also by described another normal open switch with pass the leakage current detection protection circuit induction coil and link to each other with zero-power line from magnetic test coil;
When reset button was in trip status, described a pair of normal open switch was in off-state, and tripping coil links to each other with the live wire of power output end, and passed induction coil and disconnected from the power firestreak of magnetic test coil; The place of working of leakage current detection protection circuit links to each other with the zero line of power output end; Whole leakage current detection protection circuit is not charged;
When reset button is pressed, described a pair of normal open switch closure, the normal open switch of tripping coil by closure with pass induction coil and link to each other with using from the power firestreak of magnetic test coil and the live wire of power output end; The work lower margin of leakage current detection protection circuit by described normal open switch with pass described induction coil and link to each other from the zero-power line of magnetic test coil and the zero line of power output end; The charged work of leakage current detection protection circuit;
When reset button is in reset mode; described a pair of normal open switch disconnects, and with the mains switch closure of reset button interlock, tripping coil links to each other with the live wire of power output end; the place of working of leakage current detection protection circuit links to each other with the zero line of power output end, the charged work of leakage current detection protection circuit.
Description of drawings
Fig. 1 is the disclosed leakage current detection protection circuit embodiment 1 physical circuit figure of the utility model;
Fig. 2 is the disclosed leakage current detection protection circuit embodiment 2 physical circuit figure of the utility model;
Fig. 3 is the disclosed leakage current detection protection circuit embodiment 3 physical circuit figure of the utility model;
Fig. 4 is the disclosed leakage current detection protection circuit embodiment 4 physical circuit figure of the utility model;
Fig. 5 is the disclosed leakage current detection protection circuit embodiment 5 physical circuit figure of the utility model.
Embodiment
Fig. 1 is the utility model embodiment 1, is installed in the leakage current detection protection circuit physical circuit figure with detection of electrical leakage, defencive function in the attaching plug.As shown in Figure 1, this leakage current detection protection circuit comprise the induction coil L1 (1000:1) that is used to detect leakage current, be used to detect the low resistance fault from magnetic test coil L2 (200:1), control chip IC1 (RV4145), the tripping coil L3 (SOL), the controllable silicon V4 that are built-in with iron core, simulation leakage current generating K switch R-1, with simulation leakage current generating K switch R-5, the halfwave rectifier diode V1 of testing button TEST interlock, two normal open switch K1, K2, power supply output indicator V3.
Live wire HOT, the zero line WHITE of leakage current detection protection circuit power input LINE (being the power input of attaching plug) pass the induction coil L1 (1000:1) that is used to detect leakage current, be used to detect the low resistance fault behind magnetic test coil L2 (200:1), link to each other with live wire HOT, the zero line WHITE of power output end (being the power output end of the attaching plug) LOAD of leakage current detection protection circuit by mains switch KR-2-1, KR-2-2 with attaching plug reset button RESET interlock.
Be used to detect the induction coil L1 (1000:1) of leakage current, the signal output part from magnetic test coil L2 (200:1) that is used to detect the low resistance fault links to each other with the signal input part 1,2,3,7 of control chip IC 1, the control signal output ends 5 of control chip IC1 links to each other with the trigger electrode of controllable silicon V4.The working power input 6 of control chip IC1 links to each other with the live wire HOT of the power output end LOAD of leakage current detection protection circuit by halfwave rectifier diode V1, resistance R 1, tripping coil L3.The place of working pin 4 of control chip IC1 links to each other with power ground.
The anode of controllable silicon V4 links to each other with the live wire HOT of the power output end LOAD of leakage current detection protection circuit by tripping coil L3, and the negative electrode of controllable silicon V4 links to each other with power ground.
As shown in Figure 1, the end of tripping coil L3 links to each other with the anode of controllable silicon V4; The other end of tripping coil L3 links to each other with the live wire HOT of leakage current detection protection circuit power output end LOAD; simultaneously, the other end of tripping coil L3 also by a normal open switch K1 with pass the induction coil L1 (1000:1) that is used to detect leakage current and link to each other with the power firestreak HOT that is used to detect the low resistance fault from magnetic test coil L2.
The place of working of leakage current detection protection circuit links to each other with the zero line WHITE of leakage current detection protection circuit power output end LOAD as the earth terminal from magnetic test coil L2 (200:1) that is used to detect the low resistance fault, the ground pin 4 of control chip IC1; Simultaneously, also by another normal open switch K2 with pass the induction coil L1 (1000:1) that is used to detect leakage current and link to each other with the zero-power line WHITE that is used to detect the low resistance fault from magnetic test coil L2 (200:1).
When reset button RESET is in trip status; normal open switch K1; K2 is in off-state; tripping coil L3 links to each other with the live wire HOT of leakage current detection protection circuit power output end LOAD; and be used to detect the induction coil L1 (1000:1) of leakage current and be used to detect disconnecting from the power firestreak HOT of magnetic test coil L2 of low resistance fault with passing. because the reset button RESET on the attaching plug is a trip status; the power output end of attaching plug is that the leakage current detection protection circuit power output end does not have power supply output; so tripping coil L3; controllable silicon V4; control chip IC1 is not charged, and leakage current detection protection circuit is not worked.
When reset button RESET is pressed, normal open switch K1, K2 closure, the normal open switch K1 of tripping coil L3 by closure with pass the induction coil L1 (1000:1) that is used to detect leakage current and link to each other with the live wire HOT that is used to detect the low resistance fault from the power output end LOAD of the power firestreak HOT of magnetic test coil L2 and leakage current detection protection circuit, charged; The anode of controllable silicon V4 by tripping coil L3 with pass the induction coil L1 (1000:1) that is used to detect leakage current and link to each other with the live wire HOT that is used to detect the low resistance fault from the power output end LOAD of the power firestreak HOT of magnetic test coil L2 and leakage current detection protection circuit, charged; The working power pin 6 of control chip IC1 is by resistance R 1, halfwave rectifier diode V1, tripping coil L3 and pass the induction coil L1 (1000:1) that is used to detect leakage current and link to each other with the live wire HOT from the power output end LOAD of the power firestreak HOT of magnetic test coil L2 and leakage current detection protection circuit that is used to detect the low resistance fault; charged, the charged work of whole leakage current detection protection circuit.
When reset button RESET was in reset mode, normal open switch K1, K2 disconnected, with mains switch KR-2-1, the KR-2-2 closure of reset button RESET interlock.Tripping coil L3 the live wire HOT with the power output end LOAD of leakage current detection protection circuit links to each other; The anode of controllable silicon V4 links to each other by tripping coil L3 the live wire HOT with the power output end LOAD of leakage current detection protection circuit; The working power pin 6 of control chip IC1 only links to each other the charged work of leakage current detection protection circuit with the live wire HOT of the power output end LOAD of leakage current detection protection circuit by resistance R 1, halfwave rectifier diode V1, tripping coil L3.
If have leaky or low resistance fault in the attaching plug power supply circuits; induction coil L1 or output signal to control chip IC1 then from magnetic test coil L2; the pin 5 output high level of control chip IC1; trigger controllable silicon V4 conducting; there is electric current to flow through in the tripping coil L3; produce magnetic field in the tripping coil L3; make the iron core action that is built in the tripping coil L3; thereby make the mechanical device action in the attaching plug; reset button RESET on the attaching plug is threaded off; K switch R-2-1 with reset button RESET interlock; KR-2-2 disconnects, the power supply output of the plug/leakage current detection protection circuit of cutting off the electricity supply.
Only push after reset button RESET or reset button reset; just charged work of leakage current detection protection circuit; the advantage of this design: cut down the consumption of energy on the one hand; on the other hand because electric elements are not long charged; so; prolong the useful life of electric elements, thereby prolonged the useful life of leakage current detection protection circuit.
The utility model has also comprised a K switch R-5 who links with testing button TEST.The end of this K switch R-5 links to each other with the zero line WHITE of power input LINE by resistance R 4; The other end of K switch R-5 links to each other with the live wire HOT of power output end.Push testing button TEST; K switch R-5 closure; the live wire HOT of power output end links to each other with the zero line WHITE of power input through K switch R-5, the current-limiting resistance R4 of closure; form the closed-loop path; manually produce the simulation leakage current; if this moment, leakage current detection protection circuit did not have end-of-life, then this leakage current detection protection circuit output of cutting off the electricity supply.Discharge testing button TEST, K switch R-5 disconnects, and the simulation leakage current disappears.
As shown in Figure 1, this leakage current detection protection circuit comprises that also one produces simulation leakage current circuit automatically.Simulation leakage current circuit be should produce automatically and simulation leakage current generating K switch R-1, current-limiting resistance R4 comprised.The end of simulation leakage current generating K switch R-1 links to each other with the zero line or the live wire of power input through current-limiting resistance R4, the other end with pass the induction coil L1 (1000:1) that is used to detect leakage current and link to each other with power firestreak HOT or the zero line WHITE that are used to detect the low resistance fault from magnetic test coil L2 (200:1).
Simulation leakage current generating K switch R-1 is a normally closed switch. after the power input of leakage current detection protection circuit and the power line in the wall connect; push reset button RESET; normal open switch K1, K2 closure; the zero line WHITE of power input LINE through current-limiting resistance R4, closed simulation leakage current generating K switch R-1 with pass induction coil L1 (1000:1) and link to each other with power firestreak HOT from magnetic test coil L2 (200:1); form the closed-loop path, produce the simulation leakage current automatically.
Because reset button RESET is pressed, normal open switch K1, K2 closure, tripping coil L3 through the K switch 1 of closure with pass the induction coil L1 (1000:1) that is used to detect leakage current and link to each other with the power firestreak HOT that is used to detect the low resistance fault from magnetic test coil L2 (200:1); The anode of controllable silicon V4 by tripping coil L3, closed normal open switch K1 with pass induction coil L1 (1000:1) and link to each other with power firestreak HOT from magnetic test coil L2; The working power pin 6 of control chip IC1 is by resistance R 1, halfwave rectifier diode V1, tripping coil L3, closed normal open switch K1 and pass induction coil L1 (1000:1) and link to each other the charged work of whole leakage current detection protection circuit with power firestreak HOT from magnetic test coil L2.If leakage current detection protection circuit does not have end-of-life, the then controllable silicon V4 conducting that is triggered, there is electric current to flow through in the tripping coil L3, produce magnetic field in the tripping coil L3, be built in the iron core action in the tripping coil L3, make the mechanical device action in the attaching plug, snap close is opened, the reset guide lock passes lockhole, and reset button resets; Simultaneously, the mechanical device action in the attaching plug disconnects simulation leakage current generating K switch R-1, and the simulation leakage current disappears, the reset button RESET success that resets.
After reset button RESET resetted, normal open switch K1, K2 disconnected, with K switch R-2-1, the KR-2-2 closure of reset button RESET interlock.Tripping coil L3 links to each other with the live wire HOT of leakage current detection protection circuit power output end LOAD; The anode of controllable silicon V4 links to each other with the live wire HOT of leakage current detection protection circuit power output end LOAD by tripping coil L3; The working power pin 6 of control chip IC1 links to each other with the live wire HOT of leakage current detection protection circuit power output end LOAD by resistance R 1, halfwave rectifier diode V1, tripping coil L3; the charged work of leakage current detection protection circuit, normally closed simulation leakage current generating K switch R-1 and normal open switch K1, K2 disconnect.After leakage current detection protection circuit detects leakage current; the pin 5 output high level of control chip IC1; make controllable silicon V4 conducting; produce magnetic field in the tripping coil L3; be built in the iron core action in the tripping coil L3, make the mechanical device action in the attaching plug, thereby reset button RESET is threaded off; disconnect with K switch R-2-1, the KR-2-2 of reset button RESET interlock, cut off the power supply output of leakage current detection protection circuit.Simultaneously, simulation leakage current generating K switch R-1 changes closure state into from off-state again, repeats a process.
When reset button RESET was in trip status and reset mode, above-mentioned normal open switch K2 was in off-state, and the place of working of leakage current detection protection circuit links to each other with zero line WHITE with leakage current detection protection circuit power output end LOAD.When reset button RESET is pressed; normal open switch K2 closure, the place of working of leakage current detection protection circuit with pass the induction coil L1 (1000:1) that is used to detect leakage current and be used to detect linking to each other of low resistance fault from the zero-power line WHITE of magnetic test coil L2 (200:1) and the zero line WHITE of leakage current detection protection circuit power output end LOAD.
Fig. 2 is the utility model leakage current detection protection circuit embodiment 2 physical circuit figure.The difference of leakage current detection protection circuit shown in Figure 2 and leakage current detection protection circuit shown in Figure 1 is: the shared contact of normal open switch K1, the K2 in the leakage current detection protection circuit shown in Figure 1 and mains switch KR-2-1, KR-2-2; And normal open switch K1, K2 in the leakage current detection protection circuit shown in Figure 2 and mains switch KR-2-1, KR-2-2 are separate switches.
In addition, the end of the simulation leakage current generating K switch R-1 in the leakage current detection protection circuit shown in Figure 2 links to each other with the trigger electrode of controllable silicon V4 by resistance R 3; The other end of simulation leakage current generating K switch R-1 links to each other with the live wire HOT of leakage current detection protection circuit power output end LOAD by resistance R 1, diode V1, tripping coil L3; simultaneously, the other end of simulation leakage current generating K switch R-1 also by normal open switch K1 with pass the induction coil L1 (1000:1) that is used to detect leakage current and link to each other with the power firestreak HOT that is used to detect the low resistance fault from magnetic test coil L2 (200:1).
When reset button RESET is in trip status; normal open switch K1; K2 is in off-state; tripping coil L3 links to each other with the live wire HOT of leakage current detection protection circuit power output end LOAD; and be used to detect the induction coil L1 (1000:1) of leakage current and be used to detect disconnecting from the power firestreak HOT of magnetic test coil L2 of low resistance fault with passing. because the reset button RESET on the attaching plug is a trip status; the power output end of attaching plug is that the leakage current detection protection circuit power output end does not have power supply output; so tripping coil L3; controllable silicon V4; though control chip IC1 is not charged.; simulation leakage current generating K switch R-1 closure; do not have the simulation leakage current generating in the leakage current detection protection circuit, leakage current detection protection circuit is not worked.
When reset button RESET is pressed, normal open switch K1, K2 closure, the normal open switch K1 of tripping coil L3 by closure with pass the induction coil L1 (1000:1) that is used to detect leakage current and link to each other with the live wire HOT that is used to detect the low resistance fault from the power output end LOAD of the power firestreak HOT of magnetic test coil L2 and leakage current detection protection circuit, charged; The anode of controllable silicon V4 by tripping coil L3 with pass the induction coil L1 (1000:1) that is used to detect leakage current and link to each other with the live wire HOT that is used to detect the low resistance fault from the power output end LOAD of the power firestreak HOT of magnetic test coil L2 and leakage current detection protection circuit, charged; The working power pin 6 of control chip IC1 is by resistance R 1, halfwave rectifier diode V1, tripping coil L3 and pass the induction coil L1 (1000:1) that is used to detect leakage current and link to each other with the live wire HOT from the power output end LOAD of the power firestreak HOT of magnetic test coil L2 and leakage current detection protection circuit that is used to detect the low resistance fault; charged, the charged work of whole leakage current detection protection circuit.
Because simulation leakage current generating K switch R-1 closure, so, pass the induction coil L1 (1000:1) that is used to detect leakage current and link to each other triggering controllable silicon V4 conducting with the trigger electrode of controllable silicon V4 through tripping coil L3, diode V1, resistance R 1, closed simulation leakage current generating K switch R-1, resistance R 3 with the power firestreak HOT that is used to detect the low resistance fault from magnetic test coil L2.There is electric current to flow through in the tripping coil L3, produce magnetic field in the tripping coil L3, make the iron core action that is built in the tripping coil L3, thereby make the mechanical device action in the attaching plug, the snap close in the attaching plug is moved, the reset guide lock passes lockhole, simultaneously, the mechanical device action in the attaching plug will be simulated leakage current generating K switch R-1 and be disconnected, the simulation leakage current disappears, the reset button success that resets.
When reset button RESET was in reset mode, normal open switch K1, K2 disconnected, with mains switch KR-2-1, the KR-2-2 closure of reset button RESET interlock.Tripping coil L3 links to each other with the live wire HOT of the power output end LOAD of leakage current detection protection circuit; The anode of controllable silicon V4 links to each other with the live wire HOT of the power output end LOAD of leakage current detection protection circuit by tripping coil L3; The working power pin 6 of control chip IC1 links to each other the charged work of leakage current detection protection circuit by resistance R 1, halfwave rectifier diode V1, tripping coil L3 with the live wire HOT of the power output end LOAD of leakage current detection protection circuit.
If have leaky or low resistance fault in the attaching plug power supply circuits; induction coil L1 or output signal to control chip IC1 then from magnetic test coil L2; the pin 5 output high level of control chip IC1; trigger controllable silicon V4 conducting; there is electric current to flow through in the tripping coil L3; produce magnetic field in the tripping coil L3; make the iron core action that is built in the tripping coil L3; thereby make the mechanical device action in the attaching plug; reset button RESET on the attaching plug is threaded off; K switch R-2-1 with reset button RESET interlock; KR-2-2 disconnects, the power supply output of the plug/leakage current detection protection circuit of cutting off the electricity supply.Simultaneously, simulation leakage current generating K switch R-1 changes closure state into from off-state again, repeats a process.
Fig. 3 is the utility model leakage current detection protection circuit embodiment 3 physical circuit figure.The difference of leakage current detection protection circuit shown in Figure 3 and leakage current detection protection circuit shown in Figure 1 is: do not comprise simulation leakage current generating K switch R-1 and normal open switch K1, K2 in the leakage current detection protection circuit shown in Figure 3.
The end of tripping coil L3 links to each other with the anode of controllable silicon V4; The other end of tripping coil L3 links to each other with the live wire HOT of leakage current detection protection circuit power output end LOAD.
The working power input 6 of control chip IC1 links to each other with the live wire HOT of the power output end LOAD of leakage current detection protection circuit by halfwave rectifier diode V1, resistance R 1, tripping coil L3.
The anode of controllable silicon V4 links to each other with the live wire HOT of the power output end LOAD of leakage current detection protection circuit by tripping coil L3, and the negative electrode of controllable silicon V4 links to each other with power ground.
The place of working of leakage current detection protection circuit links to each other with the zero line WHITE of leakage current detection protection circuit power output end LOAD as the earth terminal from magnetic test coil L2 (200:1) that is used to detect the low resistance fault, the ground pin 4 of control chip IC1.
When reset button RESET was in trip status, tripping coil L3, controllable silicon V4, control chip IC1 were all not charged, and leakage current detection protection circuit is not worked.When reset button RESET was in reset mode, LOAD was charged for the leakage current detection protection circuit power output end, tripping coil L3, controllable silicon V4, the charged work of control chip IC1, leakage current detection protection circuit work.
Fig. 4 can be applicable to have the interior leakage current detection protection circuit embodiment 4 physical circuit figure of supply socket/attaching plug of creepage protection function for the utility model is disclosed.As shown in the figure, this leakage current detection protection circuit is by rectification circuit V1-V4, current-limiting resistance R1~R6, diode V5, controllable silicon V6, constitute with mains switch KR-2-1, the KR-2-2 of reset button RESET interlock, two normal open switch K1, K2, the tripping coil L1 (SOL) that is built-in with iron core.
The live wire HOT of leakage current detection protection circuit power input LINE, zero line WHITE link to each other with live wire HOT, the zero line WHITE of leakage current detection protection circuit power output end LOAD through mains switch KR-2-1, the KR-2-2 with reset button RESET interlock; Simultaneously, the live wire HOT of leakage current detection protection circuit power input LINE, zero line WHITE also link to each other with live wire HOT, the zero line WHITE of leakage current detection protection circuit power output end LOAD by normal open switch K1, K2.
When reset button RESET was in trip status, normal open switch K1, K2 and mains switch KR-2-1, KR-2-2 all were in off-state, and whole leakage current detection protection circuit is not charged; When reset button RESET is pressed, normal open switch K1, K2 closure, mains switch KR-2-1, KR-2-2 disconnect, the charged work of leakage current detection protection circuit; After reset button RESET resetted, normal open switch K1, K2 disconnected, mains switch KR-2-1, KR-2-2 closure, the charged work of whole leakage current detection protection circuit.
The advantage of this design: can avoid electric elements long charged, thereby prolong the useful life of leakage current detection protection circuit.
As shown in Figure 4, the ac power input end of rectification circuit V1-V4 links to each other with zero line WHITE with the live wire HOT of leakage current detection protection circuit power output end LOAD respectively.The built-in iron core action of tripping coil L1 can make reset button RESET reset or thread off.After being built-in with tripping coil L1, the controllable silicon V6 series connection of iron core, be connected on the positive and negative power output end of DC power supply of rectification circuit V1-V4 output.
The control utmost point of controllable silicon V6 links to each other with the screen of supply socket/attaching plug power supply output line by current-limiting resistance R3, diode V5, current-limiting resistance R2.Supply socket/attaching plug power supply output live wire HOT, zero line WHITE and protective earth PE are wrapped in the screen, and this screen is formed by the alloy wire braiding of metals such as copper, iron.When there is leaky in supply socket/attaching plug; because the electric current of operating load is often bigger; the plastic protective sleeve of the outer bread of power firestreak or zero line or protective earth begins until thawing from softening; cause the insulating barrier breakage to contact with screen; make screen charged; so, when screen is charged, can judge quickly and accurately that there is leak current fault in supply socket/attaching plug.
The control utmost point of controllable silicon V6 also links to each other with the live wire HOT of leakage current detection protection circuit power output end LOAD by resistance R 3, diode V5, resistance R 1, normally closed switch KR-1.
When reset button RESET was trip status, normal open switch K1, K2 and mains switch KR-2-1, KR-2-2 all disconnected, and tripping coil L1, controllable silicon V6 are all not charged, and whole leakage current detection protection circuit is not worked.
When reset button RESET is pressed; normal open switch K1; the K2 closure; mains switch KR-2-1; KR-2-2 disconnects; leakage current detection protection circuit power output end LOAD has power supply output; rectification circuit V1-V4 work has DC power supply output. because normally closed switch KR-1 closure; so; the control utmost point of controllable silicon V6 is through resistance R 3; diode V5; resistance R 1; normally closed switch KR-1 links to each other with power firestreak HOT; the control of controllable silicon V6 is high level very; controllable silicon V6 conducting; there is electric current to flow through in the tripping coil L1; produce magnetic field in the L1, the mechanical device action in supply socket/attaching plug, the snap close in supply socket/attaching plug is moved; the reset guide lock passes lockhole; the reset button RESET success that resets, simultaneously, the mechanical device action in supply socket/attaching plug; normally closed switch KR-1 is early opened, and the trigger electrode of controllable silicon V6 becomes low level by high level.
When reset button RESET was reset mode, with mains switch KR-2-1, the KR-2-2 closure of reset button RESET interlock, normal open switch K1, K2 and normally closed switch KR-1 disconnected, and leakage current detection protection circuit power output end LOAD has power supply output.If there is leaky (leak current fault) in the current supply circuit; screen is charged; the control of controllable silicon V6 is high level very; controllable silicon V6 conducting has electric current to flow through in the tripping coil L1, produces magnetic field in the tripping coil L1; its built-in iron core action; make reset button RESET dropout/tripping operation, with mains switch KR-2-1, the KR-2-2 disconnection of reset button RESET interlock, the leakage current detection protection circuit power output end is that the output of supply socket/attaching plug does not have power supply output.
This electric-leakage detection circuit is in order to represent the state of leakage current detection protection circuit; the utility model is light-emitting diode V9 in parallel between power output end LOAD live wire HOT and zero line WHITE, and when power output end LOAD had power supply output, light-emitting diode V9 was bright; otherwise light-emitting diode V9 goes out.
During this electric-leakage detection circuit work; whether has the current leakage detection protection function in order manually to detect supply socket/attaching plug; end-of-life whether; as shown in Figure 4; can manually push testing button TEST; make closed generation of normally closed switch KR-1 of disconnection simulate leakage current, thereby make the control utmost point of controllable silicon V6 be connected to high level by current-limiting resistance R3, R1 and power firestreak.Still has creepage protection function if having the supply socket/attaching plug of creepage protection function; there is not end-of-life; then controllable silicon V6 conducting; there is electric current to flow through in the tripping coil L1; produce magnetic field; its built-in iron core action; reset button RESET is threaded off; make K switch R-2-1, KR-2-2 disconnection with reset button RESET interlock; it is that supply socket/attaching plug does not have power supply output that leakage current detection protection circuit power output end LOAD does not have power supply output, and normally closed switch KR-1 changes closure state into.Otherwise, if supply socket/attaching plug end-of-life, then reset button RESET can not thread off/or stop and reset.
In order to make the utility model whether still have creepage protection function by regular/timing automatic detection supply socket/attaching plug; as shown in Figure 4, the utility model has increased a timing chip DSQ (model 225 226 227) in leakage current detection protection circuit.The control signal output ends of this timing chip DSQ extremely links to each other with the control of controllable silicon V6; (can artificially set) exports a control signal at interval at regular intervals; make controllable silicon V6 conducting; there is electric current to flow through in the tripping coil L1; produce magnetic field; make its built-in iron core action; thereby make reset button RESET dropout/tripping operation; the K switch R-2-1, the KR-2-2 that link with reset button RESET in deenergization socket/attaching plug master current supply circuit; make supply socket not have power supply output, detect supply socket and whether still have creepage protection function.
As shown in the figure, described rectification circuit is a bridge rectifier that is made of diode V1~V4, and its ac power input end links to each other with power firestreak HOT, the zero line WHITE of supply socket/attaching plug input side LINE.
Fig. 5 is the utility model leakage current detection protection circuit embodiment 5 physical circuit figure. leakage current detection protection circuit shown in Figure 5 is identical with the operation principle of leakage current detection protection circuit shown in Figure 4, structure is basic identical, its difference is: the simulation leakage current generating switch in the leakage current detection protection circuit shown in Figure 4 has only a KR-1, this switch is a normally closed switch, it is controlled by the mechanical device in supply socket/attaching plug, also be controlled by simultaneously testing button TEST. after leakage current detection protection circuit produces the simulation leakage current, normally closed switch KR-1 disconnects; When testing button TEST was pressed, the K switch R-1 that opens was closed again, produced the simulation leakage current. and the simulation leakage current generating switch in the leakage current detection protection circuit shown in Figure 5 is two K switch R-1 and KR-5; K switch R-1 is a normally closed switch, after producing the simulation leakage current, mechanical device action in supply socket/plug is with its disconnection. and K switch R-5 is a normal open switch, is controlled by testing button TEST, push testing button, K switch R-5 closure produces the simulation leakage current, discharges testing button, K switch R-5 disconnects, and the simulation leakage current disappears.
In addition, the shared contact of normal open switch K1, the K2 in the leakage current detection protection circuit shown in Figure 5 and mains switch KR-2-1, KR-2-2; And normal open switch K1, K2 in the leakage current detection protection circuit shown in Figure 4 and mains switch KR-2-1, KR-2-2 are separate switches.
For leakage current detection protection circuit is worked reliably, as shown in Figure 1-Figure 3, the utility model is connected with an anti-interference capacitor C 5 between controllable silicon trigger electrode and ground.Through anti-interference capacitor C 5 filtering that being attempted by between controllable silicon trigger electrode and the ground from the control signal that 5 pin of control chip IC1 are exported, suppress the generation of false triggering.
In order to improve the useful life of leakage current detection protection circuit; avoid because the destruction that thunderbolt or the instantaneous pressure that causes of other reasons cause attaching plug/supply socket and the external equipment that links to each other with them; as shown in the figure; lightning-arrest sheet metal M1 in the tip that the disclosed leakage current detection protection circuit of the utility model is connected with one group of right-angled triangle that is used to discharge or isoceles triangle shape at live wire HOT and the zero line WHITE place of power output end LOAD and M2; most advanced and sophisticated lightning-arrest sheet metal M1 and M2 quite place, and the distance between two lightning-arrest sheet metal lower inside in tip is greater than the distance between its upper inner.
As shown in Figure 5; the disclosed leakage current detection protection circuit of the utility model also is connected with the lightning-arrest sheet metal M3 in tip and the M4 of one group of right-angled triangle that is used to discharge or isoceles triangle shape at the rectification circuit dc power output end; most advanced and sophisticated lightning-arrest sheet metal M3 and M4 quite place, and the distance between two lightning-arrest sheet metal lower inside in tip is greater than the distance between its upper inner.
When the live wire of power output end 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 output live wire place and is connected between the lightning-arrest sheet metal in tip at output 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 protected leakage current detection protection circuit/attaching plug, and the safe operation of the miscellaneous equipment that links to each other with attaching plug.
In sum, because the utility model adopts above technical scheme, so the disclosed leakage current detection protection circuit of the utility model has following outstanding advantage:
(1) only push after reset button RESET or reset button reset, just charged work of leakage current detection protection circuit, thus prolong useful life of leakage current detection protection circuit.
(2) has the destruction that anti-lightning strike and instantaneous pressure that other reasons causes causes attaching plug and the miscellaneous equipment that links to each other with this attaching plug.
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 (13)

1. a leakage current detection protection circuit which comprises at least the mains switch (KR-2-1, KR-2-2) that is connected in the main circuit power supply, tripping coil, the controllable silicon that is built-in with iron core;
The live wire of leakage current detection protection circuit power input (LINE), zero line link to each other with live wire, the zero line of power output end (LOAD) through described mains switch (KR-2-1, KR-2-2) respectively; It is characterized in that:
A described end that is built-in with the tripping coil of iron core links to each other with the live wire of leakage current detection protection circuit power output end (LOAD).
2. leakage current detection protection circuit according to claim 1 is characterized in that: the place of working of this leakage current detection protection circuit links to each other through the zero line of lead with power output end (LOAD).
3. leakage current detection protection circuit according to claim 2 is characterized in that: this leakage current detection protection circuit also comprises at least one pair of normal open switch (K1, K2);
One end of described tripping coil links to each other with the live wire of leakage current detection protection circuit power output end, simultaneously, an end of tripping coil also links to each other with power firestreak (HOT) from magnetic test coil (L2) with induction coil (L1) in passing leakage current detection protection circuit by a described normal open switch (K1);
The place of working of this leakage current detection protection circuit links to each other with the zero line of power output end, simultaneously, the place of working of leakage current detection protection circuit also by described another normal open switch (K2) with pass leakage current detection protection circuit induction coil (L1) and link to each other with zero-power line (WHITE) from magnetic test coil (L2);
When reset button (RESET) when being in trip status, described a pair of normal open switch (K1 and K2) is in off-state, tripping coil (L3) links to each other with the live wire of power output end LOAD, and passes induction coil (L1) and disconnects from the power firestreak (HOT) of magnetic test coil (L2); The place of working of leakage current detection protection circuit links to each other with the zero line of power output end; Whole leakage current detection protection circuit is not charged;
When reset button (RESET) when being pressed, described a pair of normal open switch (K1 and K2) closure, tripping coil (L3) by closed normal open switch (K1) with pass induction coil (L1) and link to each other with using from the power firestreak (HOT) of magnetic test coil (L2) and the live wire of power output end LOAD; The work lower margin of leakage current detection protection circuit by described normal open switch (K2) with pass described induction coil (L1) and link to each other from the zero-power line (WHITE) of magnetic test coil (L2) and the zero line of power output end; The charged work of leakage current detection protection circuit;
When reset button (RESET) when being in reset mode; described a pair of normal open switch (K1 and K2) disconnects; mains switch (KR-2-1, KR-2-2) closure with reset button (RESET) interlock; tripping coil (L3) links to each other with the live wire of power output end; the place of working of leakage current detection protection circuit links to each other with the zero line of power output end LOAD, the charged work of leakage current detection protection circuit.
4. according to the described leakage current detection protection circuit of claim 3, it is characterized in that: the anode of described controllable silicon (V4) links to each other with the live wire of power output end by described tripping coil (L3); Simultaneously, the anode of described controllable silicon (V4) is also by described tripping coil (L3), a described normal open switch (K1) and pass induction coil (L1) and link to each other with power firestreak (HOT) from magnetic test coil (L2);
When reset button (RESET) when being in trip status, described normal open switch (K1 and K2) is in off-state, and the anode of described controllable silicon (V4) links to each other with the live wire of power output end by described tripping coil (L3);
When reset button (RESET) when being pressed, described normal open switch (K1, K2) closure, the anode of described controllable silicon (V4) are by described tripping coil (L3), closed described normal open switch (K1) and pass induction coil (L1) and link to each other with using from the power firestreak (HOT) of magnetic test coil (L2) and the live wire of power output end;
When reset button (RESET) when being in reset mode, described normal open switch (K1 and K2) disconnects, with mains switch (KR-2-1, the KR-2-2) closure of reset button (RESET) interlock, the anode of described controllable silicon (V4) links to each other with the live wire of power output end by described tripping coil (L3).
5. according to the described leakage current detection protection circuit of claim 4, it is characterized in that: this leakage current detection protection circuit comprises that also is used to trigger a described silicon controlled control chip (IC1);
The working power pin (6) of this control chip (IC1) links to each other with the live wire of power output end by resistance (R1), rectifier diode (V1), tripping coil (L3); Simultaneously, the working power pin (6) of described control chip (IC1) is by resistance (R1), rectifier diode (V1), tripping coil (L3), a described normal open switch (K1) and pass induction coil (L1) and link to each other with power firestreak (HOT) from magnetic test coil (L2);
When reset button (RESET) when being in trip status, described normal open switch (K1, K2) is in off-state, and the working power pin (6) of described control chip (IC1) links to each other with the live wire of power output end by resistance (R1), rectifier diode (V1), tripping coil (L3);
When reset button (RESET) when being pressed, described normal open switch (K1 and K2) closure, the working power pin (6) of described control chip (IC1) are by resistance (R1), rectifier diode (V1), tripping coil (L3), closed described normal open switch (K1) and pass induction coil (L1) and link to each other with using from the power firestreak (HOT) of magnetic test coil (L2) and the live wire of power output end;
When reset button (RESET) when being in reset mode, described normal open switch (K1, K2) disconnects, with switch (KR-2-1, the KR-2-2) closure of reset button (RESET) interlock, the working power pin (6) of described control chip (IC1) links to each other with the live wire of power output end by resistance (R1), rectifier diode (V1), tripping coil (L3).
6. according to claim 3 or 4 or 5 described leakage current detection protection circuits, it is characterized in that: this leakage current detection protection circuit comprises a simulation leakage current generating switch (KR-1);
One end of described simulation leakage current generating switch (KR-1) links to each other with the zero line WHITE/ live wire HOT of power input through described current-limiting resistance (R4), and the other end links to each other with the power firestreak/zero line from magnetic test coil (L2) that passes the induction coil (L1) that is used to detect leakage current, be used to detect the low resistance fault;
Described simulation leakage current generating switch (KR-1) is a normally closed switch;
Press the described a pair of normal open switch of reset button (K1, K2) closure, after the power input of leakage current detection protection circuit and the power line in the wall connect, zero line/the live wire of power input is through current-limiting resistance (R4), closed described simulation leakage current generating switch (KR-1) and pass the induction coil (L1) that is used to detect leakage current, the power firestreak/zero line from magnetic test coil (L2) that is used to detect the low resistance fault links to each other, form the closed-loop path, automatically produce the simulation leakage current, detect whether end-of-life of leakage current detection protection circuit;
If leakage current detection protection circuit does not have end-of-life, snap close is moved in the then action of the mechanical device in the attaching plug, the reset guide lock passes lockhole, the reset button success that resets, described simulation leakage current generating switch (KR-1) and normal open switch (K1, K2) disconnect, and the simulation leakage current disappears; Otherwise, stop reset button to reset.
7. according to claim 3 or 4 or 5 described leakage current detection protection circuits, it is characterized in that: this leakage current detection protection circuit comprises a normally closed simulation leakage current generating switch (KR-1);
One end of described simulation leakage current generating switch (KR-1) links to each other with the trigger electrode of controllable silicon (V4) by current-limiting resistance (R3); The other end of simulation leakage current generating switch (KR-1) links to each other with the live wire (HOT) of leakage current detection protection circuit power output end (LOAD) by resistance (R1), diode (V1), tripping coil (L3); simultaneously, the other end of simulation leakage current generating switch (KR-1) also by described normal open switch (K1) with pass induction coil (L1) that is used to detect leakage current and the power firestreak that is used to detect the low resistance fault (HOT) and link to each other from magnetic test coil (L2).
8. leakage current detection protection circuit according to claim 1 is characterized in that: this leakage current detection protection circuit also comprises two normal open switch (K1, K2) at least;
The live wire (HOT) of leakage current detection protection circuit power input (LINE), zero line (WHITE) also link to each other with live wire (HOT), the zero line (WHITE) of leakage current detection protection circuit power output end (LOAD) by described two normal open switch (K1, K2) respectively;
When reset button (RESET) is trip status, described mains switch (KR-2-1, KR-2-2) and described two normal open switch (K1, K2) are off-state, leakage current detection protection circuit power output end (LOAD) does not have power supply output, and leakage current detection protection circuit is not charged;
When reset button (RESET) when being pressed, described mains switch (KR-2-1, KR-2-2) disconnects, described two normal open switch (K1, K2) closure, and the leakage current detection protection circuit power output end has power supply output, and leakage current detection protection circuit is charged;
After reset button (RESET) resets, described mains switch (KR-2-1, KR-2-2) closure, described two normal open switch (K1, K2) disconnect, and the leakage current detection protection circuit power output end has power supply output, and leakage current detection protection circuit is charged.
9. leakage current detection protection circuit according to claim 8 is characterized in that: this leakage current detection protection circuit also comprises a rectification circuit (V1-V4);
The ac power input end of described rectification circuit (V1-V4) links to each other with zero line (WHITE) with the live wire (HOT) of leakage current detection protection circuit power output end (LOAD) respectively;
A described end that is built-in with the tripping coil (L1) of iron core links to each other with the live wire of leakage current detection protection circuit power output end by described rectification circuit (V1-V4).
10. leakage current detection protection circuit according to claim 9 is characterized in that: this leakage current detection protection circuit also comprises a normally closed simulation leakage current generating switch (KR-1);
After the described tripping coil (L1) that is built-in with iron core, controllable silicon (V6) series connection, be connected on the positive and negative power output end of DC power supply of rectification circuit (V1-V4) output;
The control utmost point of controllable silicon (V6) links to each other with the screen of supply socket/attaching plug power supply output line by current-limiting resistance (R3), diode (V5), current-limiting resistance (R2);
The control utmost point of controllable silicon (V6) also links to each other with the live wire (HOT) of leakage current detection protection circuit power output end (LOAD) by resistance (R3), diode (V5), resistance (R1), described simulation leakage current generating switch (KR-1).
11. leakage current detection protection circuit according to claim 10 is characterized in that: this leakage current detection protection circuit also comprises a timing chip (DSQ);
The control signal output ends of this timing chip (DSQ) extremely links to each other with the control of described controllable silicon (V6), exports a control signal at interval at regular intervals, triggers described controllable silicon (V6).
12. according to claim 1~5, one of 8~11 described leakage current detection protection circuits, it is characterized in that: this leakage current detection protection circuit also includes the lightning-arrest sheet metal (M1 and M2) in tip of one group of right-angled triangle that is used to discharge or isoceles triangle shape;
The described tip sheet metal (M1 and M2) of taking shelter from the thunder links to each other with zero line with the live wire of leakage current detection protection circuit power output end LOAD respectively; the described tip sheet metal (M1 and M2) of taking shelter from the thunder is quite placed, and the distance between two lightning-arrest sheet metal lower inside in tip is greater than the distance between its upper inner.
13. according to the described leakage current detection protection circuit of one of claim 9~11, it is characterized in that: this leakage current detection protection circuit also includes the lightning-arrest sheet metal (M3 and M4) in tip of one group of right-angled triangle that is used to discharge or isoceles triangle shape;
The described tip sheet metal (M3 and M4) of taking shelter from the thunder links to each other with the dc power output end of described rectification circuit respectively, the described tip sheet metal (M1 and M2) of taking shelter from the thunder is quite placed, and the distance between two lightning-arrest sheet metal lower inside in tip is greater than the distance between its upper inner.
CN2009201095766U 2009-06-25 2009-06-25 Leakage detection protection circuit Expired - Fee Related CN201466675U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102377164A (en) * 2010-08-06 2012-03-14 黄华道 Energy-efficient leakage detection protection circuit
CN103094878A (en) * 2011-10-31 2013-05-08 黄华道 Leakage detecting and protecting circuit with function of preventing and protecting impact of lightning
CN110531211A (en) * 2019-10-09 2019-12-03 青岛鼎信通讯股份有限公司 A kind of circuit arrangement for alternating current-direct current current leakage detection system
US20230318280A1 (en) * 2022-04-02 2023-10-05 Dongguan City Tuocheng Industries Co., Ltd. Circuit and Plug for Timing Automatic Detection of Leakage Protection Function

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102377164A (en) * 2010-08-06 2012-03-14 黄华道 Energy-efficient leakage detection protection circuit
CN102377164B (en) * 2010-08-06 2014-11-05 黄华道 Energy-efficient leakage detection protection circuit
CN103094878A (en) * 2011-10-31 2013-05-08 黄华道 Leakage detecting and protecting circuit with function of preventing and protecting impact of lightning
CN103094878B (en) * 2011-10-31 2016-08-03 黄华道 There is the leakage current detection protection circuit of thunder-lightning surge protection function
CN110531211A (en) * 2019-10-09 2019-12-03 青岛鼎信通讯股份有限公司 A kind of circuit arrangement for alternating current-direct current current leakage detection system
CN110531211B (en) * 2019-10-09 2021-10-29 青岛鼎信通讯股份有限公司 Circuit scheme for alternating current/direct current leakage detection system
US20230318280A1 (en) * 2022-04-02 2023-10-05 Dongguan City Tuocheng Industries Co., Ltd. Circuit and Plug for Timing Automatic Detection of Leakage Protection Function
US11973336B2 (en) * 2022-04-02 2024-04-30 Dongguan City Tuocheng Industries Co., Ltd. Circuit and plug for timing automatic detection of leakage protection function

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