CN101872956B - Leakage current detection protection circuit - Google Patents
Leakage current detection protection circuit Download PDFInfo
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- CN101872956B CN101872956B CN 200910082826 CN200910082826A CN101872956B CN 101872956 B CN101872956 B CN 101872956B CN 200910082826 CN200910082826 CN 200910082826 CN 200910082826 A CN200910082826 A CN 200910082826A CN 101872956 B CN101872956 B CN 101872956B
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- 238000001514 detection method Methods 0.000 title claims abstract description 151
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 67
- 239000010703 silicon Substances 0.000 claims abstract description 67
- 230000001939 inductive effect Effects 0.000 claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 66
- 238000004088 simulation Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 230000001681 protective Effects 0.000 description 7
- 230000001960 triggered Effects 0.000 description 7
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 206010042255 Struck by lightning Diseases 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 101700036002 LED2 Proteins 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000001131 transforming Effects 0.000 description 1
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Abstract
The invention discloses a leakage current detection protection circuit, comprising an induction coil used for detecting the leakage current, a self-detection coil used for detecting the low resistance fault, a control chip, a tripping coil with an iron core inside, controlled silicon, a half-wave rectifier diode and a power output indicator. The protection circuit is characterized by also comprising an auxiliary coil connected with the tripping coil in series and a normally-closed switch device linked with the auxiliary coil. After being connected in series, the tripping coil, the auxiliary coil and the normally-closed switch device are connected between a live wire and a naught wire at the power input end to form an analog leakage current generating circuit. When no current flows throughthe auxiliary coil, the normally-closed switch device is closed, and when current flows through the auxiliary coil, the normally-closed switch device is disconnected.
Description
Technical field
The present invention relates to a kind of leakage current detection protection circuit, 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 present invention 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 invention 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 object of the present invention 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 invention 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 present invention is by the following technical solutions: a kind of leakage current detection protection circuit; it comprise induction coil for detection of leakage current, for detection of 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 leakage current detection protection circuit embodiment 1 physical circuit figure of the present invention;
Fig. 1-1 is leakage current detection protection circuit embodiment 2 physical circuit figure of the present invention;
Fig. 2 is leakage current detection protection circuit embodiment 3 physical circuit figure of the present invention;
Fig. 2-1 is leakage current detection protection circuit embodiment 4 physical circuit figure of the present invention;
Fig. 3 is leakage current detection protection circuit embodiment 5 physical circuit figure of the present invention;
Fig. 3-1 is leakage current detection protection circuit embodiment 6 physical circuit figure of the present invention;
Fig. 4 is leakage current detection protection circuit embodiment 7 physical circuit figure of the present invention;
Fig. 4-1 is leakage current detection protection circuit embodiment 8 physical circuit figure of the present invention;
Fig. 5 is leakage current detection protection circuit embodiment 9 physical circuit figure of the present invention;
Fig. 5-1 is leakage current detection protection circuit embodiment 10 physical circuit figure of the present invention;
Fig. 6 is leakage current detection protection circuit embodiment 11 physical circuit figure of the present invention;
Fig. 6-1 is leakage current detection protection circuit embodiment 12 physical circuit figure of the present invention.
Embodiment
Fig. 1 is the leakage current detection protection circuit physical circuit figure with detection of electrical leakage, defencive function that is installed in the supply socket/plug with creepage protection function disclosed by the invention.As shown in Figure 1, this leakage current detection protection circuit comprise induction coil L1 (1000: 1) for detection of leakage current, for detection of 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 induction coil L1 (1000: 1) for detection of leakage current, for detection of 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 induction coil L1 (1000: 1) for detection of leakage current, for detection of 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.
For detection of the induction coil L1 (1000: 1) of leakage current, link to each other with the signal input part 1,2,3,7 of control chip IC1 for detection of the signal output part from magnetic test coil L2 (200: 1) of low resistance fault, the control signal output 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 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 this closed-loop path produces automatically and detects whether intact passage current of tripping coil L3.
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, press 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 for detection of the induction coil L1 (1000: 1) of leakage current with 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 present invention can also manually produce the simulation leakage current by pressing 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 press 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 present invention 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 present invention is connected with one and is used for power supply output indicator V3 (LED1) and the V5 (LED2) whether expression supply socket/attaching plug has 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; leakage current detection protection circuit disclosed by the invention is connected with tip lightning-arrest sheet metal M1, a M2 who is used for discharge 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 embodiments of the invention, 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 present invention 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 the 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 leakage current detection protection circuit embodiment 2 physical circuit figure of the present invention.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 of K switch R-6,88 closures, 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 of K switch R-6,88 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 leakage current detection protection circuit embodiment 3 physical circuit figure of the present invention.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 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 leakage current detection protection circuit embodiment 4 physical circuit figure of the present invention.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; When no current flows through in tripping coil L3, the ancillary coil L4, a pair of normally-closed contact 66 of K switch R-6,88 closures, 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 of K switch R-6,88 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.
Fig. 3 is leakage current detection protection circuit embodiment 5 physical circuit figure of the present invention.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 the 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 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, press 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 for detection of the induction coil L1 (1000: 1) of leakage current with 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 leakage current detection protection circuit embodiment 6 physical circuit figure of the present invention.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 67,88; When no current flows through in tripping coil L3, the ancillary coil L4, the a pair of normally-closed contact 66 of K switch R-6,88 closures, 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 of K switch R-6,88 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.The silicon controlled negative electrode links to each other with zero-power line WHITE.
Fig. 4 is leakage current detection protection circuit embodiment 7 physical circuit figure of the present invention.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 for detection of 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 links to each other with zero-power line WHITE from magnetic test coil L2 (200: 1) with passing for detection of the induction coil L1 (1000: 1) of leakage current, 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 for detection of 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; then output signal to control chip IC1 for detection of the induction coil L1 (1000: 1) of leakage current with for detection of the signal output part from magnetic test coil L2 (200: 1) of low resistance fault; 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, press 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 for detection of the induction coil L1 (1000: 1) of leakage current with 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 leakage current detection protection circuit embodiment 8 physical circuit figure of the present invention.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; When no current flows through in tripping coil L3, the ancillary coil L4, the a pair of normally-closed contact 66 of K switch R-6,88 closures, 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 of K switch R-6,88 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 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 leakage current detection protection circuit embodiment 9 physical circuit figure of the present invention.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 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.Link to each other with power firestreak HOT from magnetic test coil L2 (200: 1) with passing for detection of the induction coil L1 (1000: 1) of leakage current with the end of the normally closed switch KR-4 of ancillary coil L4 interlock, 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; press 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, then output signal to control chip IC1 for detection of the induction coil L1 (1000: 1) of leakage current with for detection of the signal output part from magnetic test coil L2 (200: 1) of low resistance fault, 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, the guiding lock in supply socket/plug and the lockhole state that is in line, wait reset button RESET resets.At this moment, press 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 for detection of the induction coil L1 (1000: 1) of leakage current with 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 press 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 leakage current detection protection circuit embodiment 10 physical circuit figure of the present invention.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, the a pair of normally-closed contact 66 of K switch R-6,88 closures, 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 of K switch R-6,88 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 leakage current detection protection circuit embodiment 11 physical circuit figure of the present invention.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 leakage current detection protection circuit embodiment 12 physical circuit figure of the present invention.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, the a pair of normally-closed contact 66 of K switch R-6,88 closures, 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 of K switch R-6,88 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 present invention adopts above technical scheme, so leakage current detection protection circuit disclosed by the invention has following outstanding advantage:
(1) leakage current detection protection circuit of the present invention adopts 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 press 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 embodiments of the invention and the know-why used, and is any based on the equivalent transformation on the technical solution of the present invention basis, all belongs within the protection range of the present invention.
Claims (2)
1. leakage current detection protection circuit, it comprise induction coil (L1) for detection of leakage current, for detection of the low resistance fault from magnetic test coil (L2), control chip (IC1), the tripping coil (L3) that is built-in with iron core, controllable silicon (V4), halfwave rectifier diode (V1), power supply output indicator (V3, V5), it is characterized in that: it also comprise an ancillary coil (L4) of connecting with tripping coil (L3), with the normally closed switch device of ancillary coil (L4) interlock;
Described tripping coil (L3), ancillary coil (L4), with after the normally closed switch device of ancillary coil (L4) interlock is connected, be connected between power input (LINE) live wire (HOT) and the zero line (WHITE), form the loop, produce for detection of tripping coil intact passage current whether;
When not having electric current to flow through in the ancillary coil (L4) and reset button when being trip status, described normally closed switch device is in closure; In ancillary coil (L4), have electric current flow through/when reset button is reset mode, the driven disconnection of described normally closed switch device.
2. leakage current detection protection circuit according to claim 1, it is characterized in that: this leakage current detection protection circuit also comprises a switch (KR-6), this switch (KR-6) comprises a pair of normally-closed contact (66,88) and a pair of normally opened contact (67,88); Described controllable silicon anode links to each other with the power input live wire by switch (KR-6), tripping coil (L3);
When no current flows through in described tripping coil (L3), the ancillary coil (L4), a pair of normally-closed contact of switch (KR-6) (66,88) closure; Described 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 switch (KR-6);
When having electric current to flow through in tripping coil (L3), the ancillary coil (L4), the a pair of normally-closed contact of switch (KR-6) (66,88) 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) closure, 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 switch (KR-6);
The negative electrode of controllable silicon (V4) links to each other with zero-power line.
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| CN102611071B (en) * | 2011-01-25 | 2015-05-20 | 黄华道 | Electric leakage detecting protecting circuit with magnetic locking mechanism |
| CN102306924B (en) * | 2011-09-14 | 2013-11-20 | 黄华道 | Leakage detecting protection circuit capable of periodically automatically detecting function integrity |
| CN103401214A (en) * | 2013-07-17 | 2013-11-20 | 温州市万盛电器有限公司 | Electric leakage detection protection circuit with timing self-checking function |
| CN105137783A (en) * | 2015-07-31 | 2015-12-09 | 陈泽 | Intelligent socket and smart home system |
| CN109755921A (en) * | 2017-11-08 | 2019-05-14 | 苏州益而益电器制造有限公司 | Ground-fault interrupter |
| CN111880111A (en) * | 2020-06-23 | 2020-11-03 | 南方电网科学研究院有限责任公司 | Leakage current measuring device, system and method for high-voltage direct current cable |
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| CN201113383Y (en) * | 2007-09-14 | 2008-09-10 | 黄华道 | Earth leakage protective circuit possessing end-to-life detection and display function |
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| JPS62182676A (en) * | 1986-02-06 | 1987-08-11 | Fujitsu Ltd | Hit detecting circuit for electrified pallet |
| US5825599A (en) * | 1997-05-05 | 1998-10-20 | Leviton Manufacturing Co., Inc. | Ground fault circuit interrupter system with uncommitted contacts |
| JP2007141562A (en) * | 2005-11-16 | 2007-06-07 | Fuji Electric Fa Components & Systems Co Ltd | Ground-fault interrupter |
| CN100514766C (en) * | 2005-12-31 | 2009-07-15 | 黄华道 | Display circuit for the life expiration of the current leakage protection jack |
| CN201422007Y (en) * | 2009-04-22 | 2010-03-10 | 黄华道 | Electric leakage inspecting protection circuit |
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