CN201422007Y

CN201422007Y - Leakage detection protection circuit

Info

Publication number: CN201422007Y
Application number: CN200920107476XU
Authority: CN
Inventors: 黄华道; 陆华洋
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-04-22
Filing date: 2009-04-22
Publication date: 2010-03-10
Anticipated expiration: 2019-04-22

Abstract

The utility model discloses a leakage detection and protection circuit, which comprises an induction coil for detecting leakage current, a self-detection coil for detecting low-resistance faults, a control chip, a tripping coil with an iron core built in, a thyristor, The half-wave rectifier diode and the power output indicator light are characterized in that: it also includes an auxiliary coil connected in series with the trip coil, and a normally closed switch device linked with the auxiliary coil; the trip coil, the auxiliary coil, and the auxiliary coil are linked After the normally closed switch device is connected in series, it is connected between the live wire and the neutral wire of the power input terminal to form an analog leakage current generating circuit; when there is no current flowing in the auxiliary coil, the normally closed switch device is closed; when there is current flowing in the auxiliary coil , the normally closed switch device is disconnected.

Description

Leakage current detection protection circuit

Technical field

The utility model relates to a kind of leakage current detection protection circuit, and this leakage current detection protection circuit can be installed in supply socket with creepage protection function, the attaching plug.Specifically; the leakage current detection protection circuit that the utility model relates to not only has detection of electrical leakage, defencive function; and; after the power line in this leakage current detection protection circuit power input and the wall connects; can produce the detection electric current automatically; detect this leakage current detection protection circuit and whether still have creepage protection function, and show testing result.In addition, this leakage current detection protection circuit is also to having protective effect owing to the instantaneous pressure that is struck by lightning or other reasons causes to the destruction that supply socket/attaching plug causes; And has a function that stops the reverse wiring mistake.

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 provide a kind of be installed in have the current leakage detection protection function supply socket/plug in, can whether still have the leakage current detection protection circuit that creepage protection function detects to leakage current detection protection circuit automatically.

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

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

For achieving the above object; the utility model is by the following technical solutions: a kind of leakage current detection protection circuit; it comprises the induction coil that is used to detect leakage current, be used to detect the low resistance fault from magnetic test coil, control chip, the tripping coil that is built-in with iron core, controllable silicon, halfwave rectifier diode, power supply output indicator, it is characterized in that: it also comprise an ancillary coil of connecting with tripping coil, with the normally closed switch device of ancillary coil interlock.

Description of drawings

Fig. 1 is the utility model leakage current detection protection circuit embodiment 1 physical circuit figure;

Fig. 1-1 is the utility model leakage current detection protection circuit embodiment 2 physical circuit figure;

Fig. 2 is the utility model leakage current detection protection circuit embodiment 3 physical circuit figure;

Fig. 2-1 is the utility model leakage current detection protection circuit embodiment 4 physical circuit figure;

Fig. 3 is the utility model leakage current detection protection circuit embodiment 5 physical circuit figure;

Fig. 3-1 is the utility model leakage current detection protection circuit embodiment 6 physical circuit figure;

Fig. 4 is the utility model leakage current detection protection circuit embodiment 7 physical circuit figure;

Fig. 4-1 is the utility model leakage current detection protection circuit embodiment 8 physical circuit figure;

Fig. 5 is the utility model leakage current detection protection circuit embodiment 9 physical circuit figure;

Fig. 5-1 is the utility model leakage current detection protection circuit embodiment 10 physical circuit figure;

Fig. 6 is the utility model leakage current detection protection circuit embodiment 11 physical circuit figure;

Fig. 6-1 is the utility model leakage current detection protection circuit embodiment 12 physical circuit figure.

Embodiment

Fig. 1 is installed in the leakage current detection protection circuit physical circuit figure with detection of electrical leakage, defencive function in the supply socket/plug with creepage protection function for the utility model is disclosed.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 the tripping coil L3 (SOL) of magnetic test coil L2 (200: 1), control chip IC1 (RV4145), two series connection and ancillary coil L4, with normally closed switch KR-4, controllable silicon V4, halfwave rectifier diode V1, power supply output indicator V3, the V5 of ancillary coil L4 interlock.

The live wire HOT of leakage current detection protection circuit power input LINE, zero line WHITE 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), by linking to each other with live wire, zero line output conduction sleeve in the single-phase three-wire power supply output plughole on supply socket surface with supply socket/K switch R-2-1, the KR-2-2 of plug reset button RESET interlock; Simultaneously; the live wire HOT of leakage current detection protection circuit power input LINE, zero line WHITE 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 supply socket/plug-in power pack output (load end) LOAD with K switch R-3-1, the KR-3-2 that reset button RESET links by another group.

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 IC1, the control signal output ends 5 of control chip IC1 links to each other with the trigger electrode of controllable silicon V4.The negative electrode of controllable silicon V4 links to each other with the zero line WHITE of power input LINE, and the anode of controllable silicon V4 links to each other with power input live wire HOT through tripping coil L3.

The working power input 6 of control chip IC1 finally links to each other with the live wire HOT of power input LINE by resistance R 3, halfwave rectifier diode V1, tripping coil L3.The place of working pin 4 of control chip IC1 links to each other with the zero line WHITE of power input LINE.

Tripping coil L3, ancillary coil L4, with after the normally closed switch KR-4 of ancillary coil L4 interlock connect, be connected between power input LINE live wire HOT and the zero line WHITE, constitute and produce the whether intact current circuit of detection tripping coil L3 automatically.When not having electric current to flow through in the ancillary coil L4, normally closed switch KR-4 closure; When having electric current to flow through in the ancillary coil L4, produce magnetic field in the ancillary coil L4, by the mechanical device in supply socket/attaching plug normally closed switch KR-4 is disconnected.

As shown in Figure 1; after the live wire HOT of leakage current detection protection circuit power input LINE and the power line in zero line WHITE and the wall connect; because normally closed switch KR-4 closure; power input live wire HOT links to each other with power input zero line WHITE through tripping coil L3, the ancillary coil L4 of series connection, closed normally closed switch KR-4, forms the closed-loop path.At this moment, if the tripping coil L3 in the leakage current detection protection circuit is intact, do not have end-of-life, then whether intact this closed-loop path produce automatically and detect tripping coil L3 passage current.

Owing to have big electric current to flow through in tripping coil L3, the ancillary coil L4, produce magnetic field in tripping coil L3, the ancillary coil L4, be built in the iron core action in tripping coil L3, the ancillary coil L4, normally closed switch KR-4 is disconnected, the passage current that detects tripping coil L3 disappears; Simultaneously, make the mechanical trip gear action in supply socket/plug, guiding lock and lockhole in attaching plug/socket are in line, and wait for that reset button RESET resets.At this moment, push reset button RESET, top, reset button side direction below rod is pushed lock bolt open and is left lockhole, the lockhole reposition, constituting locked groove and lockhole coincide, reset button RESET resets, thereby make K switch R-2-1, KR-2-2, KR-3-1, KR-3-2 closure with reset button RESET interlock, normally closed switch KR-4 disconnects, the power supply output plughole on supply socket/plug load end LOAD and supply socket surface has power supply output, and the power supply output indicator V3, the V5 that are connected in parallel between supply socket/plug-in power pack output end live wire, zero line are bright.Under the state that reset button resets, with K switch R-2-1, KR-2-2, KR-3-1, the KR-3-2 closure of reset button RESET interlock, normally closed switch KR-4 disconnects.

Otherwise; if this moment tripping coil L3 end-of-life in the leakage current detection protection circuit; leakage current detection protection circuit does not have the current leakage detection protection function; tripping coil L3 then; no big electric current flows through in the ancillary coil L4; tripping coil L3; no magnetic field produces in the ancillary coil L4; be built in tripping coil L3; iron core in the ancillary coil L4 is failure to actuate; guiding lock in supply socket/plug is the dislocation state with lockhole all the time; reset button RESET can't reset all the time; K switch R-2-1 with reset button RESET interlock; KR-2-2; KR-3-1; KR-3-2 is not closed; the power supply output plughole non-transformer output on supply socket/plug load end LOAD and supply socket surface is connected in parallel on supply socket/plug-in power pack output live wire; power supply output indicator V3 between zero line; V5 does not work.So far, the automatic testing process of leakage current detection protection circuit finishes.

When leakage current detection protection circuit does not have end-of-life; still has creepage protection function; after reset button RESET resets; supply socket/plug-in power pack output LOAD has power supply output; if leakage current generating is arranged in the power supply circuits; because power firestreak HOT and zero line WHITE pass simultaneously and are used to detect the induction coil L1 (1000: 1) of leakage current and from magnetic test coil L2 (200: 1); article two, the current phasor in the power line and non-vanishing; the voltage signal that L1 and L2 can induce certain value at once is input to control chip IC1; output a control signal to the trigger electrode of controllable silicon V4 from 5 pin of IC1; the controllable silicon V4 conducting that is triggered; there is electric current to flow through in the tripping coil L3; produce magnetic field; its inner iron core is done ballistic motion, makes reset button RESET thread off the output of cutting off the electricity supply; be connected in parallel on supply socket/plug output live wire; power supply output indicator V3 between zero line; V5 extinguishes, and controllable silicon V4 ends.Leakage current detection protection circuit returns to initial condition; normally closed switch KR-4 reverts to closure state from off-state; leakage current detection protection circuit power input LINE live wire HOT links to each other with power input zero line WHITE through tripping coil L3, ancillary coil L4, closed normally closed switch KR-4; form the closed-loop path; automatically produce the passage current that detects tripping coil again; repeat said process, normally closed switch KR-4 changes off-state into, waits for that reset button RESET resets.

The utility model can also manually produce the simulation leakage current by pushing testing button TEST, detects whether end-of-life of earth leakage protective socket.As shown in Figure 1, link to each other with the zero line of power input by simulating leakage current current-limiting resistance R1 with the end of the Test Switchboard KR-5 of testing button TEST interlock, the other end links to each other with the live wire HOT of power output end.

When whether just often detecting supply socket/pin function, can push testing button TEST, make the Test Switchboard KR-5 closure of interlock with it, manually produce the simulation leakage current.If leakage current detection protection circuit does not have end-of-life, then reset button RESET threads off, supply socket/plug tripping operation; Leakage current detection protection circuit end-of-life when if supply socket/plug does not have reset mode, then reset button RESET is prevented from resetting.

For leakage current detection protection circuit is worked reliably, 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.

The utility model is connected with one and is used to represent whether supply socket/attaching plug has the power supply output indicator V3 (LED1) and the V5 (LED2) of power supply output between the live wire of leakage current detection protection circuit power output end and zero line.When supply socket/plug had power supply output, V3, V5 were bright; Otherwise V3, V5 do not work.

In order to improve the useful life of supply 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 disclosed leakage current detection protection circuit of the utility model is connected with a tip that is used to discharge lightning-arrest sheet metal M1, M2 respectively at live wire HOT and the zero line WHITE place of power input LINE, and most advanced and sophisticated lightning-arrest sheet metal M1, M2 quite place.In addition, the live wire HOT/ zero line WHITE of power input also links to each other with the zero line WHITE/ live wire HOT of power input through tripping coil L3, a piezo-resistance MOV.

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

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

As shown in Figure 1, the utility model also has the defencive function that stops the reverse wiring mistake.As shown in the figure, the single-phase three-wire power supply output plughole of the load end LOAD of supply socket/attaching plug and receptacle face by with the K switch R-3-1 of reset button RESET interlock, KR-3-2, KR-2-1, the live wire of KR-2-2 and power input LINE, zero line links to each other, so, when the installer mistakenly with the power line in the wall and supply socket/when attaching plug load end LOAD links to each other, even normally closed switch KR-4 closure, owing to can't form closed-loop path from power input LINE live wire HOT to power input LINE zero line WHITE, tripping coil L3, there is not electric current to flow through in the ancillary coil L4, can't produce magnetic field and promote built-in iron core action wherein, mechanical trip gear in attaching plug/supply socket is failure to actuate, reset button can't reset all the time, K switch R-2-1 with reset button RESET interlock, KR-2-2, KR-3-1, KR-3-2 is in off-state all the time, can't be closed, the equal non-transformer output of the supply hub of supply socket/attaching plug input LINE and receptacle face, V5 is bright for the power supply output indicator, but power supply output indicator V3 does not work, and shows wiring error.After the erector had only wiring correct, reset button just can reset, and power supply output indicator V3, V5 are simultaneously bright, and supply socket/plug-in power pack output just has power supply output.

Fig. 1-1 is the utility model leakage current detection protection circuit embodiment 2 physical circuit figure.Leakage current detection protection circuit embodiment 2 shown in Fig. 1-1 is with embodiment illustrated in fig. 11 difference: the anode of described controllable silicon V4 links to each other with the live wire HOT of leakage current detection protection circuit power input LINE by K switch R-6, tripping coil L3.K switch R-6 comprises a pair of normally-closed

contact

66,88 and a pair of normally opened

contact

67,88; When no current flows through in tripping coil L3, the ancillary coil L4, a pair of normally-closed

contact

66,88 closures of K switch R-6, controllable silicon V4 anode links to each other with power input LINE live wire HOT by normally-closed

contact

66,88, the tripping coil L3 of K switch R-6; When having electric current to flow through in tripping coil L3, the ancillary coil L4, the a pair of normally-closed

contact

66,88 of K switch R-6 disconnects, the reset button success that resets, mains switch KR-2-1, KR-2-2, KR-3-1, KR-3-2 closure, output has power supply output, a pair of normally opened

contact

67,88 closures, controllable silicon V4 anode links to each other with power input LINE live wire HOT by normally opened

contact

67,88, the tripping coil L3 of K switch R-6.The negative electrode of controllable silicon V4 links to each other with zero-power line.

Circuit shown in Fig. 1-1; between silicon controlled anode and power firestreak, set up K switch R-6, can guarantee quickly and reliably to turn-off controllable silicon V4 detecting leakage current detection protection circuit whether in the process of end-of-life; prevent that in testing process tripping coil L3 or ancillary coil L4 are burnt out.

Fig. 2 is the utility model leakage current detection protection circuit embodiment 3 physical circuit figure.Leakage current detection protection circuit embodiment shown in Figure 23 is with embodiment illustrated in fig. 11 difference: with thermistor Rt place of switches KR-4.

After the live wire HOT of leakage current detection protection circuit power input LINE and the power line in zero line WHITE and the wall connect; power input live wire HOT links to each other with power input zero line WHITE through tripping coil L3, ancillary coil L4, the thermistor Rt of series connection; form the closed-loop path, produce automatically and detect the whether intact passage current of tripping coil L3.The time of flowing through thermistor Rt along with passage current increases, and the temperature of thermistor Rt raises, and when its temperature is elevated to a certain degree, thermistor Rt disconnects, and the passage current that detects tripping coil L3 disappears.After the temperature of thermistor Rt reduced, thermistor Rt returned to normal condition again.

Fig. 2-1 is the utility model leakage current detection protection circuit embodiment 4 physical circuit figure.Leakage current detection protection circuit embodiment 4 shown in Fig. 2-1 is with embodiment illustrated in fig. 23 difference: the anode of described controllable silicon V4 is by linking to each other with the live wire HOT of leakage current detection protection circuit power input LINE with K switch R-6, tripping coil L3.K switch R-6 comprises a pair of normally-closed

contact

66,88 and a pair of normally opened

contact

67,88, the tripping coil L3 of K switch R-6.

Fig. 3 is the utility model leakage current detection protection circuit embodiment 5 physical circuit figure.As shown in the figure, tripping coil L3, ancillary coil L4 series connection back one end links to each other with power input live wire HOT, and the other end links to each other with the anode of controllable silicon V4; Terminate on the working power pin 6 of DC power supply/control chip IC1 with one of the normally closed switch KR-4 of ancillary coil L4 interlock, the other end links to each other with the trigger electrode of described controllable silicon V4; When not having electric current to flow through in the ancillary coil L4, with the normally closed switch KR-4 closure of ancillary coil L4 interlock; When having electric current to flow through in the ancillary coil L4, produce magnetic field in the ancillary coil L4, the work by the mechanical device in supply socket/attaching plug disconnects normally closed switch KR-4.

As shown in Figure 3; after the live wire HOT of leakage current detection protection circuit power input LINE and the power line in zero line WHITE and the wall connect; normally closed switch KR-4 closure, power input live wire HOT links to each other with the trigger electrode of controllable silicon V4 through tripping coil L3, ancillary coil L4, closed normally closed switch KR-4.

At this moment; if tripping coil L3 in the leakage current detection protection circuit and controllable silicon V4 are intact; there is not end-of-life; the triggering of controllable silicon V4 high level very then; the controllable silicon V4 conducting that is triggered; tripping coil L3; there is big electric current to flow through in the ancillary coil L4; tripping coil L3; produce magnetic field in the ancillary coil L4; be built in tripping coil L3; iron core action in the ancillary coil L4, the mechanical trip gear action in supply socket/plug disconnects normally closed switch KR-4; detect the whether intact blackout of tripping coil L3 and controllable silicon V4; simultaneously, guiding lock and lockhole in supply socket/attaching plug are in line, and wait for that reset button RESET resets.At this moment, push reset button RESET, top, reset button side direction below rod is pushed lock bolt open and is left lockhole, the lockhole reposition, constituting locked groove and lockhole coincide, reset button RESET resets, thereby make K switch R-2-1, KR-2-2, KR-3-1, KR-3-2 closure with reset button RESET interlock, normally closed switch KR-4 disconnects always, the power supply output plughole on supply socket/plug load end LOAD and supply socket surface has power supply output, and the power supply output indicator V3, the V5 that are connected in parallel between supply socket/plug-in power pack output end live wire, zero line are bright.

Otherwise; if this moment, the tripping coil L3 in the leakage current detection protection circuit was or/and controllable silicon V4 end-of-life; do not have the current leakage detection protection function; even the triggering of controllable silicon V4 is high level very; also not conducting of controllable silicon V4; tripping coil L3; no big electric current flows through in the ancillary coil L4; tripping coil L3; no magnetic field produces in the ancillary coil L4; be built in tripping coil L3; iron core in the ancillary coil L4 is failure to actuate; guiding lock in supply socket/attaching plug is the dislocation state with lockhole all the time; reset button RESET can't reset all the time; K switch R-2-1 with reset button RESET interlock; KR-2-2; KR-3-1; KR-3-2 is not closed; the power supply output plughole non-transformer output on supply socket/plug load end LOAD and supply socket surface is connected in parallel on supply socket/plug-in power pack output live wire; power supply output indicator V3 between zero line; V5 extinguishes.So far, the automatic testing process of leakage current detection protection circuit finishes.

When leakage current detection protection circuit does not have end-of-life; still has creepage protection function; after reset button RESET resets; supply socket/plug-in power pack output LOAD has power supply output; if leakage current generating is arranged in the power supply circuits; because power firestreak HOT and zero line WHITE pass simultaneously and are used to detect the induction coil L1 (1000: 1) of leakage current and from magnetic test coil L2 (200: 1); article two, the current phasor in the power line and non-vanishing; the voltage signal that L1 and L2 can induce certain value at once is input to control chip IC1; output a control signal to the trigger electrode of controllable silicon V4 from 5 pin of IC1; the controllable silicon V4 conducting that is triggered; there is electric current to flow through in the tripping coil L3; produce magnetic field; its inner iron core is done ballistic motion, makes reset button RESET thread off the output of cutting off the electricity supply; be connected in parallel on supply socket/plug output live wire; power supply output indicator V3 between zero line; V5 extinguishes, and controllable silicon V4 ends.Leakage current detection protection circuit returns to initial condition; normally closed switch KR-4 reverts to closure state from off-state; leakage current detection protection circuit power input LINE live wire HOT links to each other with the trigger electrode of controllable silicon V4 through tripping coil L3, ancillary coil L4, closed normally closed switch KR-4; repeat said process; normally closed switch KR-4 changes off-state into; wait for that reset button RESET resets, only investigating thoroughly the electric leakage reason, reset button just can reset behind the elimination leak current fault.

The anode of controllable silicon V4 among Fig. 3 links to each other with the power input live wire with ancillary coil L4 by the tripping coil L3 of series connection.

Fig. 3-1 is the utility model leakage current detection protection circuit embodiment 6 physical circuit figure.Leakage current detection protection circuit embodiment 6 shown in Fig. 3-1 is with embodiment illustrated in fig. 35 difference: the anode of described controllable silicon V4 is by linking to each other with the live wire HOT of leakage current detection protection circuit power input LINE with ancillary coil L4 with the tripping coil L3 of K switch R-6, series connection.K switch R-6 comprises a pair of normally-closed

contact

66,88 and a pair of normally opened

contact

66,88 closures of K switch R-6, controllable silicon V4 anode links to each other with power input LINE live wire HOT with ancillary coil L4 by the normally-closed

contact

66,88 of K switch R-6, the tripping coil L3 of series connection; When having electric current to flow through in tripping coil L3, the ancillary coil L4, the a pair of normally-closed

contact

67,88 closures, controllable silicon V4 anode links to each other with power input LINE live wire HOT with ancillary coil L4 by the normally opened

contact

67,88 of K switch R-6, the tripping coil L3 of series connection.The silicon controlled negative electrode links to each other with zero-power line WHITE.

Fig. 4 is the utility model leakage current detection protection circuit embodiment 7 physical circuit figure.Leakage current detection protection circuit embodiment 7 shown in Figure 4 is with embodiment illustrated in fig. 11 difference: the tripping coil L3 in the leakage current detection protection circuit shown in Figure 1, ancillary coil L4, with after the normally closed switch KR-4 of ancillary coil L4 interlock connects; be connected between power input LINE live wire HOT and the zero line WHITE; form the loop, produce the passage current that is used to detect tripping coil L3 automatically.And; tripping coil L3 in the leakage current detection protection circuit shown in Figure 4, ancillary coil L4, with after the normally closed switch KR-4 of ancillary coil L4 interlock connects; one end links to each other with power input LINE live wire HOT; the other end is used to detect the induction coil L1 (1000: 1) of leakage current and links to each other with zero-power line WHITE from magnetic test coil L2 (200: 1) with passing, and constitutes the circuit that produces the simulation leakage current automatically.

As shown in Figure 4; after the live wire HOT of leakage current detection protection circuit power input LINE and the power line in zero line WHITE and the wall connect; because normally closed switch KR-4 closure; power input live wire HOT is through tripping coil L3, the ancillary coil L4 of series connection, closed normally closed switch KR-4, resistance R 3 and pass and be used to detect the induction coil L1 (1000: 1) of leakage current and link to each other with zero-power line WHITE from magnetic test coil L2 (200: 1); form the closed-loop path, produce the simulation leakage current automatically.

At this moment; if leakage current detection protection circuit is intact; there is not end-of-life; still has the current leakage detection protection function; the signal output part from magnetic test coil L2 (200: 1) that then is used to detect the induction coil L1 (1000: 1) of leakage current and is used to detect the low resistance fault outputs signal to control chip IC1; the pin 5 output control signals of control chip IC1; trigger controllable silicon V4; the controllable silicon V4 conducting that is triggered; tripping coil L3; there is big electric current to flow through in the ancillary coil L4; tripping coil L3; produce magnetic field in the ancillary coil L4; be built in the iron core action in tripping coil L3 and the ancillary coil L4; normally closed switch KR-4 disconnects, and the simulation leakage current disappears, simultaneously; mechanical trip gear action in supply socket/plug; snap close in supply socket/attaching plug is opened, and guiding lock and lockhole are in line, and wait for that reset button RESET resets.At this moment, push reset button RESET, push lock bolt simultaneously open and leave lockhole, the lockhole reposition, locked groove and lockhole are coincide, reset button RESET just can reset, thereby make K switch R-2-1, KR-2-2, KR-3-1, KR-3-2 closure with reset button RESET interlock, normally closed switch KR-4 disconnects always, the power supply output plughole on supply socket/plug load end LOAD and supply socket surface has power supply output, and the power supply output indicator V3, the V5 that are connected in parallel between supply socket/plug-in power pack output end live wire, zero line are bright.

Otherwise; if this moment the leakage current detection protection circuit end-of-life; do not have the current leakage detection protection function; not conducting of controllable silicon V4; no big electric current flows through in the tripping coil L3; tripping coil L3; no magnetic field produces in the ancillary coil L4; be built in tripping coil L3; iron core in the ancillary coil L4 is failure to actuate; reset button RESET can't reset all the time; K switch R-2-1 with reset button RESET interlock; KR-2-2; KR-3-1; KR-3-2 is not closed; the power supply output plughole non-transformer output on supply socket/plug load end LOAD and supply socket surface is connected in parallel on supply socket/plug-in power pack output live wire; power supply output indicator V3 between zero line; V5 extinguishes.

When leakage current detection protection circuit intact; there is not end-of-life; lockhole is opened; after reset button RESET resets; supply socket/plug-in power pack output LOAD has power supply output; if leakage current generating is arranged in the power supply circuits; because power firestreak HOT and zero line WHITE pass simultaneously and are used to detect the induction coil L1 (1000: 1) of leakage current and from magnetic test coil L2 (200: 1); article two, the current phasor in the power line and non-vanishing; the voltage signal that L1 and L2 can induce certain value at once is input to control chip IC1; output a control signal to the trigger electrode of controllable silicon V4 from 5 pin of IC1; the controllable silicon V4 conducting that is triggered; have electric current to flow through in the tripping coil L3, produce magnetic field, its inner iron core is done ballistic motion; reset button RESET is threaded off; the output of cutting off the electricity supply is connected in parallel on supply socket/plug output live wire; power supply output indicator V3 between zero line; V5 extinguishes, and controllable silicon V4 ends.Leakage current detection protection circuit returns to initial condition; normally closed switch KR-4 reverts to closure state from off-state; leakage current detection protection circuit power input LINE live wire HOT links to each other with power input zero line WHITE through tripping coil L3, ancillary coil L4, closed normally closed switch KR-4; form the closed-loop path; automatically produce the simulation leakage current again; repeat said process, normally closed switch KR-4 changes off-state again into, waits for that reset button RESET resets.

Fig. 4-1 is the utility model leakage current detection protection circuit embodiment 8 physical circuit figure.Leakage current detection protection circuit embodiment 8 shown in Fig. 4-1 is with embodiment illustrated in fig. 47 difference: the anode of described controllable silicon V4 links to each other with the live wire HOT of leakage current detection protection circuit power input LINE with ancillary coil L4 by the tripping coil L3 of K switch R-6, series connection.K switch R-6 comprises a pair of normally-closed

contact

66,88 and a pair of normally opened

contact

67,88 is just closed, controllable silicon V4 anode links to each other with power input LINE live wire HOT with ancillary coil L4 by the normally opened

contact

67,88 of K switch R-6, the tripping coil L3 of series connection, and the negative electrode of controllable silicon V4 links to each other with zero-power line.

Fig. 5 is the utility model leakage current detection protection circuit embodiment 9 physical circuit figure.Leakage current detection protection circuit embodiment 9 shown in Figure 5 is with embodiment illustrated in fig. 11 difference: the tripping coil L3 in the leakage current detection protection circuit shown in Figure 1, ancillary coil L4, with after the normally closed switch KR-4 of ancillary coil L4 interlock connects; be connected between power input LINE live wire HOT and the zero line WHITE; constitute a closed-loop path, automatically produce and detect the whether intact passage current of tripping coil L3.And the anode of the controllable silicon V4 in the leakage current detection protection circuit shown in Figure 5 links to each other with the power input live wire by tripping coil L3, the ancillary coil L4 of series connection.Be used to detect the induction coil L1 (1000: 1) of leakage current and link to each other with passing with the end of the normally closed switch KR-4 of ancillary coil L4 interlock with power firestreak HOT from magnetic test coil L2 (200: 1), the other end with link to each other with power input LINE zero line WHITE with K switch R-5, the current-limiting resistance R3 series connection back of supply socket/attaching plug testing button TEST interlock, constitute and simulate the leakage current generating circuit.

As shown in Figure 5; after the live wire HOT of leakage current detection protection circuit power input LINE and the power line in zero line WHITE and the wall connect; push the testing button TEST of supply socket/attaching plug earlier; make K switch R-5 closure; at this moment; because normally closed switch KR-4 closure; power input live wire HOT passes coil L1; L2 is through the normally closed switch KR-4 of closure; closed K switch R-5 links to each other with power input zero line WHITE; form the closed-loop path; produce an artificial simulation leakage current; the work of the mechanical device in supply socket/plug, lockhole is opened, and waits for that it is the reset mode of supply socket/plug that reset button resets.

At this moment, if leakage current detection protection circuit is intact, there is not end-of-life, still has the current leakage detection protection function, the signal output part from magnetic test coil L2 (200: 1) that then is used to detect the induction coil L1 (1000: 1) of leakage current and is used to detect the low resistance fault outputs signal to control chip IC1, the pin 5 output control signals of control chip IC1, trigger controllable silicon V4, the controllable silicon V4 conducting that is triggered, tripping coil L3, there is big electric current to flow through tripping coil L3 in the ancillary coil L4, produce magnetic field in the ancillary coil L4, be built in tripping coil L3, iron core action in the ancillary coil L4, normally closed switch KR-4 is disconnected, and the simulation leakage current disappears; Simultaneously, make the mechanical trip gear action in supply socket/plug, guiding lock in supply socket/plug and the lockhole state that is in line, wait reset button RESET resets.At this moment, push reset button RESET, top, reset button side direction below rod is pushed lock bolt open and is left lockhole simultaneously, the lockhole reposition, locked groove and lockhole coincide, reset button RESET resets, thereby make K switch R-2-1, KR-2-2, KR-3-1, KR-3-2 closure with reset button RESET interlock, normally closed switch KR-4 disconnects, the power supply output plughole on supply socket/plug load end LOAD and supply socket surface has power supply output, and the power supply output indicator V3, the V5 that are connected in parallel between supply socket/plug-in power pack output end live wire, zero line are bright.

Otherwise; if this moment the leakage current detection protection circuit end-of-life; do not have the current leakage detection protection function; not conducting of controllable silicon V4; tripping coil L3; no big electric current flows through in the ancillary coil L4; tripping coil L3; no magnetic field produces in the ancillary coil L4; be built in tripping coil L3; iron core in the ancillary coil L4 is failure to actuate; guiding lock in supply socket/plug is the dislocation state with lockhole all the time; reset button RESET can't reset all the time; K switch R-2-1 with reset button RESET interlock; KR-2-2; KR-3-1; KR-3-2 is not closed; the power supply output plughole non-transformer output on supply socket/plug load end LOAD and supply socket surface is connected in parallel on supply socket/plug-in power pack output live wire; power supply output indicator V3 between zero line; V5 extinguishes.

When leakage current detection protection circuit intact; there is not end-of-life; after reset button RESET resets; supply socket/plug-in power pack output LOAD has power supply output; if leakage current generating is arranged in the power supply circuits; because power firestreak HOT and zero line WHITE pass simultaneously and are used to detect the induction coil L1 (1000: 1) of leakage current and from magnetic test coil L2 (200: 1); article two, the current phasor in the power line and non-vanishing; the voltage signal that L1 and L2 can induce certain value at once is input to control chip IC1; output a control signal to the trigger electrode of controllable silicon V4 from 5 pin of IC1; the controllable silicon V4 conducting that is triggered; tripping coil L3; there is electric current to flow through in the ancillary coil L4; produce magnetic field; its inner iron core is done ballistic motion, makes reset button RESET thread off the output of cutting off the electricity supply; be connected in parallel on supply socket/plug output live wire; power supply output indicator V3 between zero line; V5 extinguishes, and controllable silicon V4 ends.Leakage current detection protection circuit returns to initial condition, and normally closed switch KR-4 reverts to closure state from off-state.Whether still has the detection of electrical leakage function if want to detect supply socket/plug; can push testing button TEST; make K switch R-5 closure; leakage current detection protection circuit power input LINE live wire HOT passes coil L1, L2 and links to each other with power input zero line WHITE through the normally closed switch KR-4 of closure, closed K switch R-5; form the closed-loop path, produce the simulation leakage current, repeat said process; normally closed switch KR-4 disconnects, and waits for that reset button RESET resets.

Leakage current detection protection circuit embodiment shown in Figure 59 is with another difference of embodiment illustrated in fig. 11: leakage current detection protection circuit shown in Figure 5 also comprise one with the mechanism of ancillary coil L4 interlock; when having electric current to flow through in the ancillary coil L4; ancillary coil L4 opens unthreaded hole G by this mechanism, and is intact with the expression leakage current detection protection circuit.

Fig. 5-1 is the utility model leakage current detection protection circuit embodiment 10 physical circuit figure.Leakage current detection protection circuit embodiment 10 shown in Fig. 5-1 is with embodiment illustrated in fig. 59 difference: the anode of described controllable silicon V4 links to each other with the live wire HOT of leakage current detection protection circuit power input LINE with ancillary coil L4 by the tripping coil L3 of K switch R-6, series connection.K switch R-6 comprises a pair of normally-closed contact 66,88 and a pair of normally opened contact 67,88; When no current flows through in tripping coil L3, the ancillary coil L4, a pair of normally-closed contact 66,88 closures of K switch R-6, controllable silicon V4 anode links to each other with power input LINE live wire HOT with ancillary coil L4 by the normally-closed contact 66,88 of K switch R-6, the tripping coil L3 of series connection; When having electric current to flow through in tripping coil L3, the ancillary coil L4, the a pair of normally-closed contact 66,88 of K switch R-6 disconnects, the reset button success that resets, mains switch KR-2-1, KR-2-2, KR-3-1, KR-3-2 closure, output has power supply output, a pair of normally opened contact 67,88 closures, controllable silicon V4 anode links to each other with power input LINE live wire HOT with ancillary coil L4 by the normally opened contact 67,88 of K switch R-6, the tripping coil L3 of series connection.

Fig. 6 is the utility model leakage current detection protection circuit embodiment 11 physical circuit figure.Leakage current detection protection circuit embodiment shown in Figure 6 11 is with embodiment illustrated in fig. 59 difference: leakage current detection protection circuit shown in Figure 5 also comprise one with the mechanism of ancillary coil L4 interlock; when having electric current to flow through in the ancillary coil L4; ancillary coil L4 makes this mechanism action by the mechanical device in supply socket/attaching plug; open unthreaded hole G, intact with the expression leakage current detection protection circuit.Leakage current detection protection circuit shown in Figure 6 comprises a pointer N1 who links with ancillary coil L4; when having electric current to flow through in the ancillary coil L4; ancillary coil L4 moves pointer N1 by the mechanical device in supply socket/attaching plug; the expression leakage current detection protection circuit still has the current leakage detection protection function; detect successfully, reset button can reset.

Fig. 6-1 is the utility model leakage current detection protection circuit embodiment 12 physical circuit figure.Leakage current detection protection circuit embodiment 12 shown in Fig. 6-1 is with embodiment illustrated in fig. 6 11 difference: the anode of described controllable silicon V4 links to each other with the live wire HOT of leakage current detection protection circuit power input LINE with ancillary coil L4 by the tripping coil L3 of K switch R-6, series connection.K switch R-6 comprises a pair of normally-closed contact 66,88 and a pair of normally opened contact 67,88; When no current flows through in tripping coil L3, the ancillary coil L4, a pair of normally-closed contact 66,88 closures of K switch R-6, controllable silicon V4 anode links to each other with power input LINE live wire HOT with ancillary coil L4 by the normally-closed contact 66,88 of K switch R-6, the tripping coil L3 of series connection; When having electric current to flow through in tripping coil L3, the ancillary coil L4, the a pair of normally-closed contact 66,88 of K switch R-6 disconnects, the reset button success that resets, mains switch KR-2-1, KR-2-2, KR-3-1, KR-3-2 closure, output has power supply output, a pair of normally opened contact 67,88 closures, controllable silicon V4 anode links to each other with power input LINE live wire HOT with ancillary coil L4 by the normally opened contact 67,88 of K switch R-6, the tripping coil L3 of series connection.

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) the utility model leakage current detection protection circuit adopts the tripping coil L3 and the ancillary coil L4 of i.e. two series connection of twin coil design.Its advantage: in advance the snap close in supply socket/plug is opened by ancillary coil L4, waited for that reset button resets, alleviate the burden of tripping coil L3; Simultaneously, detect tripping coil L3 and path whether normally, end-of-life whether, if current leakage jack life termination then stops supply socket/plug to reset.Design ingeniously, easy to use, operate simpler.

(2) after the power line in supply socket/plug-in power pack input and the wall connects, can automatically or push testing button TEST and produce detect electric current, detect supply socket/plug and whether still have the i.e. end-of-life whether of creepage protection function.

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

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

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

1. A leakage detection and protection circuit, which includes an induction coil (L1) for detecting leakage current, a self-detection coil (L2) for detecting low-resistance faults, a control chip (IC1), and a tripping circuit with a built-in iron core Coil (L3), silicon controlled rectifier (V4), half-wave rectifier diode (V1), power output indicator light (V3, V5), characterized in that it also includes an auxiliary coil ( L4), a normally closed switch device linked with the auxiliary coil (L4).

2. The leakage detection and protection circuit according to claim 1, characterized in that, after the tripping coil (L3), the auxiliary coil (L4), and the normally closed switch device linked with the auxiliary coil (L4) are connected in series, they are connected to A loop is formed between the live wire (HOT) and the neutral wire (WHITE) of the power input terminal (LINE) to generate a path current for detecting whether the tripping coil is intact;

When there is no current flowing in the auxiliary coil (L4) and the reset button is in the tripping state, the normally closed switch device is closed; when there is current flowing in the auxiliary coil (L4)/the reset button is in the reset state, the The normally closed switching device is driven open.

3. The electric leakage detection and protection circuit according to claim 1, characterized in that: the tripping coil (L3) and the auxiliary coil (L4) are connected in series, one end is connected to the power input terminal (LINE) live wire (HOT), and the other end It is connected to the anode of the thyristor (V4), and the cathode of the thyristor (V4) is connected to the neutral line of the power supply; one end of the normally closed switch (KR-4) linked with the auxiliary coil (L4) is connected to the DC power supply/control chip ( IC1) The working power supply pin (6) is connected, and the other end is connected with the trigger pole of the thyristor (V4) to form a loop to generate a pass current for detecting whether the tripping coil and the thyristor are intact;

4. The leakage detection and protection circuit according to claim 1, characterized in that: after the tripping coil (L3), the auxiliary coil (L4), and the normally closed switch device linked with the auxiliary coil (L4) are connected in series, one end is connected to The power supply input terminal (LINE) is connected to the live wire (HOT)/neutral wire (WHITE), and the other end is connected to the power supply passing through the induction coil (L1) for detecting leakage current and the self-detection coil (L2) for detecting low-resistance faults The neutral wire (WHITE)/hot wire (HOT) are connected to form an analog leakage current generation circuit;

When there is no current flowing in the auxiliary coil (L4) and the reset button is in the trip state, the normally closed switch device is usually closed; when the reset button is in the reset state, the normally closed switch device is driven to open.

5. The leakage detection and protection circuit according to claim 1, characterized in that: one end of the normally closed switch device linked with the auxiliary coil (L4) is connected to the induction coil (L1) passing through the leakage current detection coil (L1). It is connected to the live wire/neutral wire of the self-detection coil (L2) used to detect low-resistance faults, and the other end is connected to the neutral wire of the power input terminal through the switch (KR-5) linked with the test button (TEST) and the resistor (R3) /firewire connection;

The anode of the thyristor is connected to the live wire of the power input terminal through the tripping coil (L3) and the auxiliary coil (L4) connected in series, and the cathode of the thyristor is connected to the neutral wire of the power supply;

When there is no current flowing in the auxiliary coil (L4) and the reset button is in the tripping state, the normally closed switch device is automatically closed; when there is current flowing in the auxiliary coil (L4)/the reset button is in the reset state, the The normally closed switch device is automatically disconnected.

6. The leakage detection and protection circuit according to claim 5, characterized in that: when the power socket/power plug is not at the end of its life, it is connected correctly, the function of the circuit needs to press the test button (TEST) first, and then press the reset button (RESET) ); otherwise prevent reset.

7. The leakage detection protection circuit according to claim 2, characterized in that: the leakage detection protection circuit further comprises a switch (KR-6), and the switch (KR-6) comprises a pair of normally closed contacts (66, 88) and a pair of normally open contacts (67, 88); the thyristor anode is connected to the live wire of the power input terminal through a switch (KR-6) and a tripping coil (L3);

When no current flows through the tripping coil (L3) and the auxiliary coil (L4), a pair of normally closed contacts (66, 88) of the switch (KR-6) are closed; the anode of the thyristor (V4) Connect the normally closed contacts (66, 88) and the tripping coil (L3) of the switch (KR-6) to the live wire (HOT) of the power input terminal (LINE);

When the tripping coil (L3) and the auxiliary coil (L4) have current flowing through them, the pair of normally closed contacts (66, 88) of the switch (KR-6) are disconnected, the reset button resets successfully, and the power switch (KR- 2-1, KR-2-2, KR-3-1, KR-3-2) are closed, the output terminal has power output, a pair of normally open contacts (67, 88) are closed, and the anode of the thyristor (V4) Connect the normally open contacts (67, 88) and the tripping coil (L3) of the switch (KR-6) to the live wire (HOT) of the power input terminal (LINE);

The cathode of the thyristor (V4) is connected to the neutral line of the power supply.

8. The leakage detection and protection circuit according to any one of claims 3, 4, and 5, characterized in that: the leakage detection and protection circuit further includes a switch (KR-6), and the switch (KR-6) includes a pair of normal closed contacts (66, 88) and a pair of normally open contacts (67, 88); the thyristor anode passes through the switch (KR-6), the tripping coil (L3) in series, the auxiliary coil (L4) and The power input terminal is connected to the fire wire;

When there is no current flowing in the tripping coil (L3) and the auxiliary coil (L4), a pair of normally closed contacts (66, 88) of the switch (KR-6) are closed, and the anode of the thyristor (V4) passes through the switch (KR-6). -6) The normally closed contacts (66, 88), the series tripping coil (L3) and the auxiliary coil (L4) are connected to the power input terminal LINE live wire (HOT);

When the tripping coil (L3) and the auxiliary coil (L4) have current flowing through them, the pair of normally closed contacts (66, 88) of the switch (KR-6) are disconnected, the reset button resets successfully, and the power switch (KR- 2-1, KR-2-2, KR-3-1, KR-3-2) are closed, the output terminal has power output, a pair of normally open contacts (67, 88) are closed, and the anode of the thyristor (V4) The normally open contacts (67, 88) of the switch KR-6 ( ), the series tripping coil (L3) and the auxiliary coil (L4) are connected to the power input terminal (LINE) and the live wire (HOT).

9. The leakage detection and protection circuit according to any one of claims 1-8, characterized in that the normally closed switch device is a normally closed switch (KR-4).

10. The leakage detection and protection circuit according to any one of claims 1-8, characterized in that the normally closed switch device is a thermistor (Rt).