CN201966581U - Electric leakage detection and protection circuit - Google Patents

Electric leakage detection and protection circuit Download PDF

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Publication number
CN201966581U
CN201966581U CN2010201990608U CN201020199060U CN201966581U CN 201966581 U CN201966581 U CN 201966581U CN 2010201990608 U CN2010201990608 U CN 2010201990608U CN 201020199060 U CN201020199060 U CN 201020199060U CN 201966581 U CN201966581 U CN 201966581U
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China
Prior art keywords
leakage current
protection circuit
links
current detection
switch
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Expired - Fee Related
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CN2010201990608U
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黄华道
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黄华道
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Priority to CN2010201990608U priority Critical patent/CN201966581U/en
Priority claimed from US13/108,035 external-priority patent/US9203232B2/en
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Publication of CN201966581U publication Critical patent/CN201966581U/en
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Abstract

The utility model discloses an electric leakage detection and protection circuit, which comprises rectification circuits, current-limiting resistors, an SCR (silicon controlled rectifier), a switch linked with a reset button, and a tripping coil internally provided with an iron core, wherein the rectification circuits, the tripping coil internally provided with the iron core and the SCR are connected in series with one another to form a loop; after a current flows through the tripping coil, a magnetic field is produced in the tripping coil, and the iron core arranged in the tripping coil acts to enable the reset button to be tripped; a control electrode of the SCR is connected with a shielding layer of a power output line of a power socket/plug through one current-limiting resistor and a diode; and when an electric leakage fault occurs to the power socket/plug, since the shielding layer connected with the control electrode of the SCR is electrified, the SCR is triggered to be switched on, the magnetic field is produced in the tripping coil, and the iron core arranged in the tripping coil acts to enable the reset button to be tripped. The electric leakage detection and protection circuit is simple and has strong functions.

Description

Leakage current detection protection circuit
Technical field
The utility model relates to a kind of leakage current detection protection circuit with detection of electrical leakage, defencive function that is installed in the supply socket/attaching plug with creepage protection function.Specifically, the utility model relates to the energy-saving leakage current detection protection circuit that a kind of circuit structure is simple, have life end checking function, Presentation Function.
Background technology
(be called for short earth leakage protective socket, GFCI)/the continuous development of attaching plug industry, people are more and more higher to function, safety in utilization, the reliability requirement of earth leakage protective socket/plug along with the supply socket with creepage protection function.This makes the insider constantly be devoted to study, improves the leakage current detection protection circuit that is installed in earth leakage protective socket/plug, makes more succinct, the with better function strength of its circuit, work more reliable.
Summary of the invention
In view of the foregoing, main purpose of the present utility model provides the leakage current detection protection circuit that a kind of circuit is succinct, have life end checking function.
Another purpose of the present utility model provides a kind of leakage current detection protection circuit with Presentation Function.
Another purpose of the present utility model provides a kind of energy-saving leakage current detection protection circuit.
For achieving the above object, the utility model is by the following technical solutions: a kind of leakage current detection protection circuit, this leakage current detection protection circuit are by rectification circuit, second current-limiting resistance, the 3rd current-limiting resistance, the 4th current-limiting resistance, the 6th current-limiting resistance, controllable silicon, constitute with the main circuit power supply switch of reset button interlock, the tripping coil that is built-in with iron core;
Described silicon controlled negative electrode links to each other with the negative pole of described rectification circuit dc power output end, and described silicon controlled anode links to each other through the positive pole of described tripping coil with described rectification circuit dc power output end;
The described silicon controlled control utmost point links to each other with the screen of supply socket/attaching plug power supply output line by described the 3rd current-limiting resistance, diode, second current-limiting resistance.
In embodiment of the present utility model, this leakage current detection protection circuit also includes a total power switch;
One end of this total power switch links to each other with leakage current detection protection circuit power input live wire or zero line, and the other end links to each other with an ac power input end of described rectification circuit;
When described total power switch is closed; for whole leakage current detection protection circuit provides the described rectification circuit work of working power power supply output is arranged; whole leakage current detection protection circuit powers on and can work, and when described total power switch disconnected, whole leakage current detection protection circuit was not charged.
This leakage current detection protection circuit also comprises a power switch that links with reset button, a life-span stop detection switch that links with reset button;
Described silicon controlled anode links to each other with the positive pole of described rectification circuit dc power output end through described power switch, tripping coil with the reset button interlock; Simultaneously, described silicon controlled anode also links to each other with the positive pole of described rectification circuit dc power output end by described life-span stop detection switch, tripping coil with the reset button interlock;
The described silicon controlled control utmost point is also by described the 3rd current-limiting resistance, diode, the 6th current-limiting resistance, link to each other with the life-span stop detection switch and the described rectification circuit dc power output end positive pole of reset button interlock;
When reset button was trip status, described power switch, life-span stop detection switch, main circuit power supply switch with the reset button interlock all was off-state;
When reset button is pressed, the described life-span stop detection switch closure that links with reset button, the power switch, the main circuit power supply switch that link with reset button all are off-state; Described silicon controlled anode links to each other through the dc power output end positive pole of described life-span stop detection switch, tripping coil and the described rectification circuit of closure, described silicon controlled negative electrode links to each other with the dc power output end negative pole of described rectification circuit, the described silicon controlled control utmost point links to each other with the dc power output end of described rectification circuit is anodal through described current-limiting resistance, diode, closed life-span stop detection switch, and leakage current detection protection circuit carries out life-span stop detection;
When reset button is reset mode; described power switch, main circuit power supply switch with the reset button interlock is closure state; change off-state with the life-span stop detection switch of reset button interlock into by closure state, the leakage current detection protection circuit power output end has power supply output.
Described power switch and life-span stop detection switch not only link with reset button, also link with testing button;
When testing button was pressed, described power switch changed off-state into by closure state, and described life-span stop detection switch changes closure state into by off-state.
In another embodiment of the present utility model, this leakage current detection protection circuit also includes a life-span stop detection switch;
An ac power input end of described rectification circuit links to each other with the live wire of leakage current detection protection circuit power input; Another ac power input end of rectification circuit links to each other with the zero line of leakage current detection protection circuit power output end, simultaneously, another ac power input end of rectification circuit also links to each other with leakage current detection protection circuit power input zero line by described life-span stop detection switch;
The reset button interlock of described life-span stop detection switch and earth leakage protective socket;
When reset button was in trip status and reset mode, described life-span stop detection switch disconnected, when reset button is pressed, and described life-span stop detection switch closure.
Described life-span stop detection switch also with the interlock of the testing button of earth leakage protective socket;
One end of this life-span stop detection switch links to each other with leakage current detection protection circuit power output end zero line, and the other end extremely links to each other with silicon controlled control through the 6th current-limiting resistance, diode, the 3rd current-limiting resistance; The common port of life-span stop detection switch links to each other with the power input zero line.
The utility model leakage current detection protection circuit also comprises a display circuit, and this display circuit is made of the 5th resistance and the relay indicating light of series connection;
One end of this display circuit links to each other with the dc power anode of described rectification circuit through described tripping coil, and the other end of display circuit links to each other with leakage current detection protection circuit power output end zero line;
When reset button resets, the leakage current detection protection circuit power output end has power supply output, and described relay indicating light is bright; When reset button was in trip status, described relay indicating light did not work.
This leakage current detection protection circuit also comprises a simulation leakage current generating switch that links with testing button;
One end of this simulation leakage current generating switch links to each other with leakage current detection protection circuit power output end live wire or zero line, and the other end extremely links to each other with described silicon controlled control through described first current-limiting resistance, diode, the 3rd current-limiting resistance.
This leakage current detection protection circuit also is connected with the discharge metal sheet of that be used to discharge a, rectangle or rectangle or right-angled trapezium shape respectively at leakage current detection protection circuit power input live wire, zero line place;
The most advanced and sophisticated relative tilt of described two discharge metal sheets is placed, and keeps certain intervals; Distance between the two discharge metal sheets top is littler than the distance between the below.
The utility model leakage current detection protection circuit is parallel with a piezo-resistance between described silicon controlled anode and negative electrode.Between the described silicon controlled control utmost point and negative electrode, be connected with the 4th current-limiting resistance and electric capacity in parallel.
At described this leakage current detection protection circuit at work; the user wonders whether this circuit is working properly; press testing button; the closure of life-span stop detection switch, if this circuit does not have end-of-life, the controllable silicon conducting; tripping coil produces the field core action; if this circuit is end-of-life, controllable silicon, tripping coil iron core all do not have reaction, so the user threads off testing button again by arriving second place positive mechanical.
The utlity model has following advantage: circuit is succinct, low cost of manufacture; When reset button is in trip status; whole leakage current detection protection circuit is not charged; have only reset button to be pressed and reset button when resetting; the just charged work of whole leakage current detection protection circuit; thereby; saves energy prolongs the useful life of electric elements, and then prolongs the useful life of whole 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.
Embodiment
Fig. 1 is installed in the leakage current detection protection circuit embodiment 1 physical circuit figure in the supply socket/attaching plug with creepage protection function for the utility model is disclosed.As shown in Figure 1, this leakage current detection protection circuit by rectification circuit V1-V4, the second current-limiting resistance R2, the 3rd current-limiting resistance R3, the 4th current-limiting resistance R4, the 6th current-limiting resistance R6, diode V5, controllable silicon SCR, be built-in with the tripping coil L1 (SOL) of iron core, with reset button RESET interlock main circuit power supply K switch 1, K2, constitute with the power switch K3 and the life-span stop detection switch TE3 of reset button RESET interlock.
The built-in iron core action of tripping coil L1 can make reset button RESET reset or thread off.
The negative electrode of controllable silicon SCR links to each other with the negative pole of rectification circuit V1-V4 dc power output end, and the anode of controllable silicon SCR links to each other with the positive pole of rectification circuit V1-V4 dc power output end through power switch K3, the tripping coil L1 with reset button RESET interlock; Simultaneously, the anode of controllable silicon SCR also links to each other with the positive pole of rectification circuit V1-V4 dc power output end by life-span stop detection switch TE3, tripping coil L1 with reset button RESET interlock.
The control utmost point of controllable silicon SCR links to each other with the screen of supply socket/attaching plug power supply output line by the 3rd current-limiting resistance R3, diode V5, the second current-limiting resistance R2; Simultaneously, the control utmost point of controllable silicon SCR also links to each other with rectification circuit V1-V4 dc power output end is anodal with the life-span stop detection switch TE3 of reset button RESET interlock by the 3rd current-limiting resistance R3, diode V5, the 6th current-limiting resistance R6.
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.
Be connected with the 4th current-limiting resistance R4 and capacitor C 1 in parallel between the control utmost point of controllable silicon SCR and the negative electrode.
When reset button RESET was trip status, described power switch K3, life-span stop detection switch TE3, main circuit power supply K switch 1, K2 with reset button RESET interlock all was off-state.
When reset button RESET was pressed, with the life-span stop detection switch TE3 closure of reset button RESET interlock, the power switch K3, main circuit power supply K switch 1, the K2 that link with reset button RESET all were off-state.Because life-span stop detection switch TE3 closure, the silicon controlled anode links to each other with the dc power output end of rectification circuit is anodal through life-span stop detection switch TE3, the tripping coil L1 of closure, the silicon controlled negative electrode links to each other with the dc power output end negative pole of rectification circuit, and the silicon controlled control utmost point links to each other with the dc power output end of rectification circuit is anodal through the 3rd current-limiting resistance R3, diode V5, the 6th current-limiting resistance R6, closed life-span stop detection switch TE3.If leakage current detection protection circuit does not have end-of-life, then controllable silicon SCR conducting has electric current to flow through in the tripping coil L1, produces magnetic field in the tripping coil L1, and its built-in iron core action can reset reset button RESET.Otherwise, if the leakage current detection protection circuit end-of-life does not then have electric current to flow through in the tripping coil L1, not producing magnetic field in the tripping coil L1, its built-in iron core is failure to actuate, and reset button RESET can't reset all the time.
When reset button RESET was reset mode, the power switch K3, main circuit power supply K switch 1, the K2 that link with reset button RESET were closure state, and the life-span stop detection switch TE3 that links with reset button RESET changes off-state into from closure state.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 SCR is high level very, the controllable silicon SCR 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, the K switch 1, the K2 that link with reset button RESET in deenergization socket/attaching plug current supply circuit make supply socket/attaching plug not have power supply output.
In order to represent the state of leakage current detection protection circuit/supply socket/attaching plug, the utility model also comprises a display circuit, and this display circuit is made of the 5th resistance R 5 and the relay indicating light V6 of series connection.One end of display circuit links to each other with the dc power output end of rectification circuit is anodal through tripping coil L1, and the other end of display circuit links to each other with leakage current detection protection circuit power output end zero line.
RESET resets when reset button, with main circuit power supply K switch 1, the K2 closure of reset button RESET interlock, when leakage current detection protection circuit power output end LOAD has power supply output, has electric current to flow through in the display circuit, and relay indicating light V6 is bright.When reset button RESET was pressed and is in trip status, the main circuit power supply K switch 1, the K2 that link with reset button RESET were in off-state, and no current flows through in the display circuit, and relay indicating light V6 does not work.
After live wire HOT, the zero line WHITE of leakage current detection protection circuit power input LINE and power firestreak, zero line in the wall connect; press reset button RESET; with the life-span stop detection switch TE3 closure of reset button RESET interlock, power switch K3 and main circuit power supply K switch 1, K2 all disconnect.At this moment, leakage current detection protection circuit carries out life-span stop detection, if leakage current detection protection circuit does not have end-of-life, then reset button RESET can reset, if the leakage current detection protection circuit end-of-life, then reset button can't reset all the time.
When reset button RESET is reset mode, power switch K3, main circuit power supply K switch 1, K2 closure, life-span stop detection switch TE3 disconnects.If exist leak current fault in supply socket/attaching plug power supply circuits this moment, the then controllable silicon SCR conducting that is triggered immediately, produce magnetic field in the tripping coil L1, its built-in iron core action, make reset button RESET dropout/tripping operation, disconnect with K switch 1, K2, the K3 of reset button RESET interlock, make supply socket/attaching plug not have power supply output.
As shown in Figure 1, in the utility model and power switch K3 reset button RESET interlock and life-span stop detection switch TE3 not only with reset button RESET interlock, also link with testing button TEST.When testing button TEST was pressed, power switch K3 disconnected, life-span stop detection switch TE3 closure.
When reset button REST is reset mode, power switch K3, main circuit power supply K switch 1, K2 closure, life-span stop detection switch TE3 disconnects, and the power output end of leakage current detection protection circuit has power supply output.If want to cut off the power supply output of leakage current detection protection circuit power output end this moment, push testing button TEST, make power switch K3 disconnect life-span stop detection switch TE3 closure.Because life-span stop detection K switch 3 closures; the silicon controlled anode is through the life-span stop detection K switch 3 of closure; tripping coil L1 links to each other with the dc power output end of rectification circuit is anodal; the silicon controlled negative electrode links to each other with the dc power output end negative pole of rectification circuit; the silicon controlled control utmost point is through the 3rd current-limiting resistance R3; diode V5; the 6th current-limiting resistance R6; closed life-span stop detection switch TE3 links to each other with the dc power output end of rectification circuit is anodal; the controllable silicon SCR conducting; there is electric current to flow through in the tripping coil L1; produce magnetic field in the tripping coil L1; its built-in iron core action; make reset button RESET dropout/tripping operation; main circuit power supply K switch 1; K2 disconnects, and leakage current detection protection circuit/supply socket/attaching plug does not have power supply output.
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 live wire HOT, the zero line WHITE of leakage current detection protection circuit input LINE.
In order to improve the useful life of earth leakage protective socket/attaching plug; avoid because the destruction that the instantaneous pressure that thunderbolt or other reasons cause causes supply socket/attaching plug; as shown in Figure 1, the utility model is connected with discharge metal sheet P1, the P2 of that be used to discharge a, rectangle or rectangle or right-angled trapezium shape respectively at leakage current detection protection circuit power input live wire HOT, zero line WHITE place.Two most advanced and sophisticated relative tilts of discharge metal sheet P1, P2 are placed, and keep certain intervals.The two metal sheets relative tilt is placed, and the distance between its top is littler than the distance between the below.
Between the anode of controllable silicon SCR and negative electrode, be parallel with a piezo-resistance MOV.
When because thunderbolt or the instantaneous pressure that causes of other reasons when acting on supply socket/attaching plug; the air dielectric that is connected to the discharge metal sheet P1 at input live wire place and is connected between the discharge metal sheet P2 at input zero line place is breakdown; form atmospherical discharges; most of high pressure consumes by the discharge metal sheet; the residue sub-fraction consumes by tripping coil SOL, piezo-resistance MOV, thereby has protected supply socket/attaching plug not broken by high pressure.
In specific embodiment of the utility model, described piezo-resistance MOV selects surge inhibition type piezo-resistance for use, makes it can also play the effect that prevents electrophoresis.
Fig. 2 is the disclosed leakage current detection protection circuit embodiment 2 physical circuit figure of the utility model.The difference of it and embodiment 1 shown in Figure 1 is: this leakage current detection protection circuit also comprises a simulation leakage current generating K switch R-5 with testing button TEST interlock.The end of this simulation leakage current generating K switch R-5 links to each other with leakage current detection protection circuit power output end LOAD live wire, and the other end extremely links to each other with the control of controllable silicon SCR through the first current-limiting resistance R1, diode V5, the 3rd current-limiting resistance R3.
When leakage current detection protection circuit normally uses; when the user wants to cut off the power supply output of leakage protection circuit power output end; as shown in Figure 2; manually push testing button TEST; make simulation leakage current generating K switch R-5 closure; the control utmost point of controllable silicon SCR links to each other with the power output end live wire by the 3rd current-limiting resistance R3, diode V5, the first current-limiting resistance R1, is high level.The controllable silicon SCR conducting has electric current to flow through in the tripping coil L1, produces magnetic field, and its built-in iron core action is threaded off reset button RESET, and the main circuit power supply K switch 1 of interlock with it, K2 are disconnected, and makes leakage current detection protection circuit not have power supply output.
Fig. 3 is the disclosed leakage current detection protection circuit embodiment 3 physical circuit figure of the utility model.It and Fig. 2, embodiment 2 shown in Figure 1, the main distinction of embodiment 1 are: the utility model has also designed a total power switch KR-2.The end of total power switch KR-2 links to each other with leakage current detection protection circuit power input live wire; the other end links to each other with the ac power input end of rectification circuit V1-V4; simultaneously, this ac power input end of rectification circuit V1-V4 also links to each other with the live wire of the power output end of leakage current detection protection circuit.This total power switch KR-2 and reset button RESET interlock, when reset button RESET is pressed, total power switch KR-2 closure, when reset button was in trip status, this total power switch KR-2 disconnected.
When reset button RESET was in trip status, total power switch KR-2 disconnected, and does not work for whole leakage current detection protection circuit provides the rectification circuit V1-V4 of working power, and whole leakage current detection protection circuit is not charged.When reset button RESET is pressed, total power switch KR-2 closure, rectification circuit V1-V4 work, whole leakage current detection protection circuit powers on and can work.After reset button resets, main circuit power supply K switch 1 closure, the power output end of leakage current detection protection circuit has power supply output, provides power supply by power output end for rectification circuit V1-V4.
The advantage of this design is: when reset button is in trip status; whole leakage current detection protection circuit is not charged; have only reset button to be pressed and reset button when resetting; the just charged work of whole leakage current detection protection circuit; thereby; saves energy prolongs the useful life of electric elements, and then prolongs the useful life of whole leakage current detection protection circuit.
Fig. 4 is installed in the leakage current detection protection circuit embodiment 4 physical circuit figure in the supply socket/attaching plug with creepage protection function for the utility model is disclosed.Leakage current detection protection circuit shown in Figure 4 and Fig. 1-leakage current detection protection circuit shown in Figure 3 is compared more succinct.
As shown in Figure 4, this leakage current detection protection circuit is by rectification circuit V1-V4, the second current-limiting resistance R2, the 6th current-limiting resistance R6, the 3rd current-limiting resistance R3, the 4th current-limiting resistance R4, diode V5, controllable silicon SCR, the tripping coil L1 (SOL) that is built-in with iron core, the main circuit power supply K switch 1 with reset button RESET interlock, K2 formation.
The built-in iron core action of tripping coil L1 can make reset button RESET reset or thread off.
The negative electrode of controllable silicon SCR links to each other with the negative pole of rectification circuit V1-V4 dc power output end, and the anode of controllable silicon SCR links to each other with the positive pole of rectification circuit V1-V4 dc power output end through tripping coil L1.
The control utmost point of controllable silicon SCR links to each other with the screen of supply socket/attaching plug power supply output line by the 3rd current-limiting resistance R3, diode V5, the second 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.
Be connected with the 4th current-limiting resistance R4 and capacitor C 1 in parallel between the control utmost point of controllable silicon SCR and the negative electrode.
For saves energy; prolong the useful life of electric elements; as shown in Figure 4; provide the ac power input end of the rectification circuit V1-V4 of DC power supply to link to each other with the live wire of leakage current detection protection circuit power input for whole leakage current detection protection circuit, another ac power input end of rectification circuit V1-V4 links to each other with the zero line of leakage current detection protection circuit power output end.
As shown in Figure 4, this leakage current detection protection circuit also comprises a life-span stop detection switch TE3 who links with reset button and testing button.Leakage current detection protection circuit power input zero line links to each other with another ac power input end of rectification circuit V1-V4 through life-span stop detection switch TE3.
As shown in Figure 4; when reset button RESET is in trip status; all be in off-state with main circuit power supply K switch 1, K2 and the life-span stop detection switch TE3 of reset button RESET interlock; do not work for whole leakage current detection protection circuit provides the rectification circuit V1-V4 of power supply, whole leakage current detection protection circuit is not charged.When reset button RESET is pressed; life-span stop detection switch TE3 closure; the power input zero line links to each other with the ac power input end of rectification circuit V1-V4 through the life-span stop detection switch TE3 of closure, rectification circuit V1-V4 work, and whole leakage current detection protection circuit powers on and can work.After reset button resetted, life-span stop detection switch TE3 disconnected, main circuit power supply K switch 2 closures, and the power output end of leakage current detection protection circuit has power supply output, provides power supply by power output end for rectification circuit V1-V4.
In order to represent the state of leakage current detection protection circuit/supply socket/attaching plug, the utility model also comprises a display circuit, and this display circuit is made of the 5th resistance R 5 and the relay indicating light V6 of series connection.One end of display circuit links to each other with the dc power anode of rectification circuit through taking off mouthful coil L1, and the other end of display circuit links to each other with leakage current detection protection circuit power output end zero line.
RESET resets when reset button, and with main circuit power supply K switch 1, the K2 closure of reset button RESET interlock, leakage current detection protection circuit power output end LOAD has power supply output, has electric current to flow through in the display circuit, and relay indicating light V6 is bright.When reset button RESET was in trip status, the main circuit power supply K switch 1, the K2 that link with reset button RESET were in off-state, and no current flows through in the display circuit, and relay indicating light V6 does not work.
In order to detect whether end-of-life of leakage current detection protection circuit; perhaps when the leakage current detection protection circuit operate as normal; the user wants to cut off the power supply output of leakage protection circuit power output end; as shown in Figure 4, this leakage current detection protection circuit also comprises a life-span stop detection switch TE3 who links with testing button TEST.The end of this life-span stop detection switch TE3 links to each other with leakage current detection protection circuit power output end LOAD zero line, and the other end extremely links to each other with the control of controllable silicon SCR through the 6th current-limiting resistance R6, diode V5, the 3rd current-limiting resistance R3; The common port of life-span stop detection switch TE3 links to each other with the power input zero line.
As shown in Figure 4, manually push testing button TEST, make life-span stop detection switch TE3 closure, the control utmost point of controllable silicon SCR links to each other with the power output end zero line by the 6th current-limiting resistance R6, diode V5, the 3rd current-limiting resistance R3.Because the output of leakage current detection protection circuit output is AC power; so; when SCR control very during high level; the controllable silicon SCR conducting has electric current to flow through in the tripping coil L1, produces magnetic field; its built-in iron core action; reset button RESET is threaded off, the main circuit power supply K switch 1 of interlock with it, K2 are disconnected, make leakage current detection protection circuit not have power supply output.On the other hand, can be by pushing testing button TEST, whether move and judge whether end-of-life of this leakage current detection protection circuit by observing reset button.
In sum, the disclosed leakage protection circuit of the utility model has following outstanding advantage: circuit structure is simple, low cost of manufacture; Conserve energy, the useful life of prolongation electrical equipment original paper.
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 (11)

1. leakage current detection protection circuit is characterized in that: this leakage current detection protection circuit is by rectification circuit, second current-limiting resistance (R2), the 3rd current-limiting resistance (R3), the 4th current-limiting resistance (R4), the 6th current-limiting resistance (R6), controllable silicon, constitute with the main circuit power supply switch (K1, K2) of reset button interlock, the tripping coil (L1) that is built-in with iron core;
Described silicon controlled negative electrode links to each other with the negative pole of described rectification circuit dc power output end, and described silicon controlled anode links to each other with the positive pole of described rectification circuit dc power output end through described tripping coil (L1);
The described silicon controlled control utmost point links to each other with the screen of supply socket/attaching plug power supply output line by described the 3rd current-limiting resistance (R3), diode (V5), second current-limiting resistance (R2).
2. leakage current detection protection circuit according to claim 1 is characterized in that: this leakage current detection protection circuit also includes a total power switch (KR-2);
One end of this total power switch (KR-2) links to each other with leakage current detection protection circuit power input live wire or zero line, and the other end links to each other with an ac power input end of described rectification circuit.
3. leakage current detection protection circuit according to claim 1 and 2 is characterized in that: this leakage current detection protection circuit also comprises a power switch (K3) that links with reset button, a life-span stop detection switch (TE3) that links with reset button;
Described silicon controlled anode links to each other with the positive pole of described rectification circuit dc power output end through described power switch (K3), tripping coil (L1) with the reset button interlock; Simultaneously, described silicon controlled anode also links to each other with the positive pole of described rectification circuit dc power output end by described life-span stop detection switch (TE3), tripping coil (L1) with the reset button interlock;
The described silicon controlled control utmost point is also by described the 3rd current-limiting resistance (R3), diode (V5), the 6th current-limiting resistance (R6), link to each other with life-span stop detection switch (TE3) and described rectification circuit dc power output end positive pole that reset button links.
4. leakage current detection protection circuit according to claim 3 is characterized in that: described power switch (K3) and life-span stop detection switch (TE3) not only link with reset button, also link with testing button.
5. leakage current detection protection circuit according to claim 1 is characterized in that: this leakage current detection protection circuit also includes a life-span stop detection switch (TE3);
An ac power input end of described rectification circuit links to each other with the live wire of leakage current detection protection circuit power input; Another ac power input end of rectification circuit links to each other with the zero line of leakage current detection protection circuit power output end, simultaneously, another ac power input end of rectification circuit also links to each other with leakage current detection protection circuit power input zero line by described life-span stop detection switch (TE3);
Described life-span stop detection switch (TE3) links with the reset button of earth leakage protective socket.
6. leakage current detection protection circuit according to claim 5 is characterized in that: described life-span stop detection switch (TE3) also with the interlock of the testing button of earth leakage protective socket;
One end of this life-span stop detection switch (TE3) links to each other with leakage current detection protection circuit power output end zero line, and the other end extremely links to each other with silicon controlled control through described the 6th current-limiting resistance (R6), diode (V5), the 3rd current-limiting resistance (R3); The common port of life-span stop detection switch (TE3) links to each other with the power input zero line.
7. according to claim 1 or 2 or 5 or 6 described leakage current detection protection circuits, it is characterized in that: this leakage current detection protection circuit also comprises a display circuit, and this display circuit is made of the 5th resistance (R5) and the relay indicating light (V6) of series connection;
One end of this display circuit links to each other with the dc power anode of described rectification circuit through described tripping coil (L1), and the other end of display circuit links to each other with leakage current detection protection circuit power output end zero line.
8. leakage current detection protection circuit according to claim 7 is characterized in that: this leakage current detection protection circuit also comprises a simulation leakage current generating switch (KR-5) that links with testing button;
One end of this simulation leakage current generating switch (KR-5) links to each other with leakage current detection protection circuit power output end live wire or zero line, and the other end extremely links to each other with described silicon controlled control through described first current-limiting resistance (R1), diode (V5), the 3rd current-limiting resistance (R3).
9. leakage current detection protection circuit according to claim 8 is characterized in that: this leakage current detection protection circuit also is connected with the discharge metal sheet (P1, P2) of that be used to discharge a, rectangle or rectangle or right-angled trapezium shape respectively at leakage current detection protection circuit power input live wire, zero line place;
The most advanced and sophisticated relative tilt of described two discharge metal sheets (P1, P2) is placed, and keeps certain intervals; Distance between the two discharge metal sheets top is littler than the distance between the below.
10. leakage current detection protection circuit according to claim 9 is characterized in that: be parallel with a piezo-resistance between described silicon controlled anode and negative electrode.
11. leakage current detection protection circuit according to claim 10 is characterized in that: between the described silicon controlled control utmost point and negative electrode, be connected with described the 4th current-limiting resistance (R4) and electric capacity (C1) in parallel.
CN2010201990608U 2010-05-18 2010-05-18 Electric leakage detection and protection circuit Expired - Fee Related CN201966581U (en)

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CN2010201990608U CN201966581U (en) 2010-05-18 2010-05-18 Electric leakage detection and protection circuit
US13/108,035 US9203232B2 (en) 2010-05-05 2011-05-16 Leakage detection protective circuit

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102255277A (en) * 2010-05-18 2011-11-23 黄华道 Leakage detection protection circuit
CN102593785A (en) * 2012-02-13 2012-07-18 黄德富 Protective circuit for electric leakage detection
CN107370125A (en) * 2017-08-14 2017-11-21 广东美的制冷设备有限公司 Breaker and its dropout drive circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102255277A (en) * 2010-05-18 2011-11-23 黄华道 Leakage detection protection circuit
CN102593785A (en) * 2012-02-13 2012-07-18 黄德富 Protective circuit for electric leakage detection
CN102593785B (en) * 2012-02-13 2014-06-04 黄德富 Protective circuit for electric leakage detection
CN107370125A (en) * 2017-08-14 2017-11-21 广东美的制冷设备有限公司 Breaker and its dropout drive circuit

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