CN101872957B - Leakage current detection protection circuit - Google Patents
Leakage current detection protection circuit Download PDFInfo
- Publication number
- CN101872957B CN101872957B CN 200910082965 CN200910082965A CN101872957B CN 101872957 B CN101872957 B CN 101872957B CN 200910082965 CN200910082965 CN 200910082965 CN 200910082965 A CN200910082965 A CN 200910082965A CN 101872957 B CN101872957 B CN 101872957B
- Authority
- CN
- China
- Prior art keywords
- switch
- tripping coil
- leakage current
- coil
- normally
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Breakers (AREA)
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 a normally-closed switch linked with the tripping coil and used for generating analog leakage current and a switch linked with the tripping coil and a reset button. The anode of the controlled silicon is connected with the switch, the tripping coil and a live wire at the power input end.
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 manual generation simulate leakage current, detect this leakage current detection protection circuit and whether still have creepage protection function.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, safety in utilization is higher, work is 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 carries out self check to leakage current detection protection circuit.
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 comprises a normally closed switch with the tripping coil interlock.
In specific embodiments of the invention, after the normally closed switch of described and tripping coil interlock and described tripping coil were connected, an end linked to each other with the live wire of power input, and the other end links to each other with the zero line of power input, constitute the loop, produce the electric current that detects described tripping coil;
When not having electric current to flow through in the tripping coil, described normally closed switch is in closure state; When having electric current to flow through in the tripping coil, the driven disconnection of described normally closed switch.
In specific embodiments of the invention, one end of the normally closed switch of described and tripping coil interlock links to each other with power input live wire/zero line through described tripping coil, the other end of normally closed switch through resistance with pass induction coil for detection of leakage current, link to each other for detection of the zero-power line/live wire from magnetic test coil of low resistance fault, constitute and produce simulation leakage current circuit automatically;
When not having electric current to flow through in the tripping coil, described normally closed switch is in closure state; When having electric current to flow through in the tripping coil, the driven disconnection of described normally closed switch.
In specific embodiments of the invention, one end of the normally closed switch of described and tripping coil interlock describedly links to each other with the power firestreak/zero line from magnetic test coil for detection of the low resistance fault for detection of the induction coil of leakage current with passing, and the other end is by linking to each other with power input zero line/live wire with switch, resistance that testing button links;
When not having electric current to flow through in the tripping coil, described normally closed switch closure; When having electric current to flow through in the tripping coil, described normally closed switch is disconnected.
Description of drawings
Fig. 1 is leakage current detection protection circuit embodiment 1 physical circuit figure of the present invention;
Fig. 2 is leakage current detection protection circuit embodiment 2 physical circuit figure of the present invention;
Fig. 2-1 is leakage current detection protection circuit embodiment 3 physical circuit figure of the present invention;
Fig. 3 is leakage current detection protection circuit embodiment 4 physical circuit figure of the present invention;
Fig. 3-1 is leakage current detection protection circuit embodiment 5 physical circuit figure of the present invention;
Fig. 4 is leakage current detection protection circuit embodiment 6 physical circuit figure of the present invention;
Fig. 4-1 is leakage current detection protection circuit embodiment 7 physical circuit figure of the present invention;
Fig. 5 is the mechanical device decomposition texture schematic diagram that resets/trip that is installed in the supply socket/plug with creepage protection function.
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 magnetic test coil L2 (200: 1), control chip IC1 (RV4145), be built-in with iron core tripping coil L3 (SOL), controllable silicon V4, with K switch R-5, halfwave rectifier diode V1, the power supply output indicator V3 of testing button TEST 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/mains switch KR1-1, the KR2-1 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 R1-2, the KR2-2 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 working power input 6 of control chip IC1 links to each other with the live wire HOT of power input LINE by resistance R 1, 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.
The anode of controllable silicon V4 links to each other with the live wire HOT of power input LINE by tripping coil L3, and the negative electrode of controllable silicon V4 links to each other with the zero line WHITE of power input LINE.
Link to each other with the zero line WHITE of power input LINE by resistance R 4 with the end of the K switch R-5 of testing button TEST interlock; The other end with pass induction coil L1 for detection of leakage current, link to each other for detection of the power firestreak HOT from magnetic test coil L2 of low resistance fault, simultaneously, the other end of K switch R-5 also links to each other with the live wire HOT of power output end.
As shown in Figure 1; after the power input of supply socket/attaching plug that leakage current detection protection circuit is installed and the power line in the wall connect; press testing button TEST earlier; make K switch R-5 closure; the live wire HOT of power input LINE is through induction coil L1, link to each other with the zero line WHITE of power input LINE from magnetic test coil L2, closed K switch R-5, resistance R 4; form the closed-loop path, manually produce the simulation leakage current.
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.Because the anode of controllable silicon V4 links to each other with power firestreak through tripping coil L3, the negative electrode of controllable silicon V4 links to each other with zero-power line, the triggering of controllable silicon V4 is high level very, so, the controllable silicon V4 conducting that is triggered, there is big electric current to flow through in the tripping coil L3, produce magnetic field in the tripping coil L3, be built in the iron core action in the tripping coil L3, make mechanical device (as shown in Figure 5) action that resets/trip in supply socket/plug, snap close 30 in supply socket/attaching plug is opened, and guiding lock 35 and lockhole 31 are in line, and wait for that reset button RESET resets.At this moment, press reset button RESET, reset button RESET resets, K switch R-2-1, KR-2-2, KR-3-1, KR-3-2 closure with reset button RESET interlock, 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 that is connected in parallel between supply socket/plug-in power pack output end live wire, zero line is bright.
Discharge testing button TEST, K switch R-5 disconnects, and the simulation leakage current disappears.
As shown in Figure 1; after the power input of supply socket/attaching plug that leakage current detection protection circuit is installed and the power line in the wall connect; if at first do not press testing button TEST; at first do not produce the simulation leakage current; making in the tripping coil L3 has electric current to flow through, and produces magnetic field, makes built-in iron core action wherein; thereby make the mechanical device action that resets/trip in supply socket/plug wait for that reset button RESET resets, reset button RESET will be prevented from resetting.
Fig. 2 is the 2 physical circuit figure of the leakage current detection protection circuit embodiment with detection of electrical leakage, defencive function that are installed in the supply socket/plug with creepage protection function disclosed by the invention.As shown in Figure 2, this leakage current detection protection circuit also comprises a normally closed switch KR-4 who links with tripping coil L3.
Tripping coil L3, with after the normally closed switch KR-4 of tripping coil L3 interlock connects, an end links to each other with power input LINE live wire HOT, the other end links to each other with the power input zero line.When no current flows through in the tripping coil L3, normally closed switch KR-4 closure, when having electric current to flow through in the tripping coil L3, normally closed switch KR-4 disconnects.
As shown in Figure 2, after the power input of supply socket/attaching plug and the power line in the wall connect, need not to operate any parts, because normally closed switch KR-4 closure, so, the power input live wire links to each other with the power input zero line through tripping coil L3, normally closed switch KR-4, produces the electric current that detects tripping coil L3 automatically.
If tripping coil L3 is intact, there is not end-of-life, then produce magnetic field in the tripping coil L3, make the iron core action that is built in the tripping coil L3, thereby make mechanical device (as shown in Figure 5) action that resets/trip in supply socket/plug, snap close 30 is opened, and guiding lock 35 and lockhole 31 are in line, and waits for that reset button RESET resets.At this moment, press reset button RESET, reset button RESET resets, K switch R-2-1, KR-2-2, KR-3-1, KR-3-2 closure with reset button RESET interlock, 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.
L3 is intact when tripping coil, have electric current to flow through in it after, the normally closed switch KR-4 of interlock disconnects with it, for detection of the current vanishes of tripping coil L3.
Fig. 2-1 is the embodiment of the invention 3 physical circuit figure.As shown in the figure, this leakage current detection protection circuit also comprises a K switch R-6 who links with tripping coil L3 and reset button RESET.
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 is through linking to each other with the live wire HOT of power input LINE with K switch R-6, the tripping coil L3 of reset button RESET interlock with 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 the tripping coil L3, 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 the tripping coil L3, 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, power output end 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.
Leakage current detection protection circuit shown in Fig. 2-1 can guarantee to detect leakage current detection protection circuit whether in the process of end-of-life setting up K switch R-6 between controllable silicon anode and the tripping coil; quickly and reliably turn-off controllable silicon V4; prevent that in testing process tripping coil L3 is burnt out.
Shown in Fig. 2-1, when 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 after reset button resets, supply socket/plug-in power pack output LOAD has power supply output.When in the power supply circuits leakage current generating being arranged, if electric-leakage detection circuit is intact, there is not end-of-life, then since 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, by the shown in Figure 5 resetting/mechanical device that trips 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; Simultaneously, K switch R-6 action with tripping coil L3 and reset button RESET interlock, normally-closed contact 66,88 changes closure state again into, normally opened contact 67,88 changes off-state again into, and normally closed switch KR-4 produce electric current subsequently KR-4 disconnect again, return pin and lockhole are identical, and wait resets, and prove working properly.If correct wiring, the leakage current detection protection circuit end-of-life, burn out as tripping coil L3 or controllable silicon V4, then reset button was resetted by automatic the prevention, and the K switch R-6 that links with tripping coil L3 and reset button RESET is failure to actuate, and rests on normally off.
Fig. 3 is the embodiment of the invention 4 physical circuit figure.As shown in the figure; the end of the normally closed switch KR-4 that links with tripping coil L3 in this leakage current detection protection circuit links to each other with power input LINE live wire HOT through tripping coil L3; 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 through resistance R 3, constitutes the circuit that produces the simulation leakage current automatically.When no current flow through in the tripping coil L3, normally closed switch KR-4 closure produced the simulation leakage current automatically; When having electric current to flow through in the tripping coil L3, normally closed switch KR-4 disconnects, and produces the circuit breaker of simulation leakage current automatically, and the simulation leakage current disappears.
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; because normally closed switch KR-4 closure; power input live wire HOT is through tripping coil L3, 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.Because the anode of controllable silicon V4 links to each other with power firestreak through tripping coil L3, the negative electrode of controllable silicon V4 links to each other with zero-power line, the triggering of controllable silicon V4 is high level very, so the controllable silicon V4 conducting that is triggered has big electric current to flow through in the tripping coil L3, produce magnetic field in the tripping coil L3, be built in the iron core action in the tripping coil L3, normally closed switch KR-4 disconnects, and the simulation leakage current disappears; Simultaneously, mechanical device (as shown in Figure 5) action that resets/trip in supply socket/plug is opened the snap close 30 in supply socket/attaching plug, and guiding lock 35 and lockhole 31 are in line, and wait for that reset button RESET resets.At this moment, press reset button RESET, reset button RESET resets, 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 that is connected in parallel between supply socket/plug-in power pack output end live wire, zero line is 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; no magnetic field produces in the tripping coil L3; the iron core that is built in the tripping coil L3 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 does not work.
When leakage current detection protection circuit intact; there is not end-of-life; lockhole 31 (as shown in Figure 5) 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; by the shown in Figure 5 resetting/mechanical device that trips 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 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 the normally closed switch KR-4 of tripping coil L3 closure; 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. 3-1 is the embodiment of the invention 5 physical circuit figure.Fig. 3-1 illustrated embodiment 5 is with embodiment illustrated in fig. 34 difference: the anode of the leakage current detection protection circuit controllable silicon V4 shown in Fig. 3-1 is through linking to each other with the live wire HOT of power input LINE with K switch R-6, the tripping coil L3 of reset button RESET interlock with 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 the tripping coil L3, 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 the tripping coil L3, 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.
Shown in Fig. 3-1; 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 is through tripping coil L3, 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.Because the anode of controllable silicon V4 links to each other with power firestreak through closing contact 66,88, the tripping coil L3 of K switch R-6, the negative electrode of controllable silicon V4 links to each other with zero-power line, the triggering of controllable silicon V4 is high level very, so, the controllable silicon V4 conducting that is triggered, there is big electric current to flow through in the tripping coil L3, produce magnetic field in the tripping coil L3, be built in the iron core action in the tripping coil L3, normally closed switch KR-4 disconnects, the simulation leakage current disappears, and the normally-closed contact 66 of K switch R-6,88 disconnects normally opened contact 67,88 closures; Simultaneously, mechanical trip gear (as shown in Figure 5) action in supply socket/plug is opened the snap close 30 in supply socket/attaching plug, and guiding lock 35 and lockhole 31 are in line, and waits for that reset button RESET resets.At this moment, press reset button RESET, reset button RESET resets, 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 that is connected in parallel between supply socket/plug-in power pack output end live wire, zero line is 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; no magnetic field produces in the tripping coil L3; the iron core that is built in the tripping coil L3 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 does not work.
When leakage current detection protection circuit intact; there is not end-of-life; lockhole 31 is (as Fig. 5; shown in Figure 6) open; 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; by the shown in Figure 5 resetting/mechanical device that trips 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 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 the normally closed switch KR-4 of tripping coil L3 closure; 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 is the embodiment of the invention 6 physical circuit figure.As shown in the figure; 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 tripping coil L3 interlock in this leakage current detection protection circuit; the other end links to each other with power input LINE zero line WHITE by K switch R-5, current-limiting resistance R4, constitutes manually simulation leakage current generating circuit.Described K switch R-5 and supply socket/attaching plug testing button TEST interlock, when testing button TEST is pressed, K switch R-5 closure, after testing button TEST was released, K switch R-5 disconnected.
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; 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 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 a manual simulation leakage current.
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, there is big electric current to flow through in the tripping coil L3, produce magnetic field in the tripping coil L3, be built in the iron core action in the tripping coil L3, make the mechanical device action that resets/trip in supply socket/plug shown in Figure 5, lockhole 31 is opened, and waits for that reset button resets; Simultaneously, owing to produce magnetic field in the tripping coil L3, be built in the iron core action in the tripping coil L3, normally closed switch KR-4 is disconnected, the simulation leakage current disappears.
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, 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 that is connected in parallel between supply socket/plug-in power pack output end live wire, zero line is 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; no magnetic field produces in the tripping coil L3; the iron core that is built in the tripping coil L3 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 does not work.
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; 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; extinguish, controllable silicon V4 ends.Leakage current detection protection circuit returns to initial condition, and normally closed switch KR-4 reverts to closure from off-state, changes off-state naturally again into.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.
Fig. 4-1 is the embodiment of the invention 7 physical circuit figure.Fig. 4-1 illustrated embodiment 7 is with embodiment illustrated in fig. 46 difference: the anode of the leakage current detection protection circuit controllable silicon V4 shown in Fig. 4-1 is through linking to each other with the live wire HOT of power input LINE with K switch R-6, the tripping coil L3 of reset button RESET interlock with 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 the tripping coil L3, 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 the tripping coil L3, 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.
Shown in Fig. 1～Fig. 4-1, 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 the figure, link to each other with the zero line of power input by simulating leakage current current-limiting resistance R4 with the end of the Test Switchboard KR-5 of testing button TEST interlock, the other end with pass induction coil L1 and link to each other with live wire HOT from the power output end of magnetic test coil L2.
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, the live wire of power output end is linked to each other with the zero line of power input, 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 the figure; 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.
Shown in Fig. 1～Fig. 4-1, 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, owing to can't form the closed-loop path from power input LINE live wire HOT to power input LINE zero line WHITE, there is not electric current to flow through in the tripping coil L3, can't produce magnetic field and promote built-in iron core action wherein, mechanical trip gear 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, V3 is bright for the power supply output indicator, shows wiring error.After the erector had only wiring correct, reset button just can reset, power supply output indicator V3, and the V while 5 is bright, and supply socket/plug-in power pack output just has power supply output.
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), after the power line in supply socket/plug-in power pack input and the wall connects, press testing button TEST earlier, press reset button RESET again, if leakage current detection protection circuit does not have end-of-life, then reset button RESET resets; Otherwise reset button is prevented from resetting.
(2) after the power line in supply socket/plug-in power pack input and the wall connects, but automatic or manual produce to detect electric current, detects supply socket/plug and whether still has 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 (6)
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 comprises a normally closed switch (KR-4) with tripping coil (L3) interlock;
It also comprises a K switch R-6 who links with tripping coil (L3) and reset button (RESET);
This K switch R-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 K switch R-6, tripping coil (L3);
When no current flows through in the described tripping coil (L3), a pair of normally-closed contact of K switch R-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 K switch R-6;
When having electric current to flow through in the tripping coil (L3), the a pair of normally-closed contact of K switch R-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 K switch R-6.
2. leakage current detection protection circuit according to claim 1, it is characterized in that: after the normally closed switch (KR-4) of described and tripping coil (L3) interlock and described tripping coil (L3) are connected, one end links to each other with the live wire (HOT) of power input (LINE), the other end links to each other with the zero line (WHITE) of power input (LINE), constitute the loop, produce the electric current that detects described tripping coil (L3);
When not having electric current to flow through in the tripping coil (L3), described normally closed switch (KR-4) is in closure state; When having electric current to flow through in the tripping coil (L3), the driven disconnection of described normally closed switch (KR-4).
3. leakage current detection protection circuit according to claim 1, it is characterized in that: an end of the normally closed switch (KR-4) of described and tripping coil (L3) interlock links to each other with power input (LINE) live wire (HOT)/zero line (WHITE) through described tripping coil (L3), the other end of normally closed switch (KR-4) through resistance with pass induction coil (L1) for detection of leakage current, link to each other for detection of the zero-power line from magnetic test coil (L2) (the WHITE)/live wire (HOT) of low resistance fault, constitute and produce simulation leakage current circuit automatically;
When not having electric current to flow through in the tripping coil (L3), described normally closed switch (KR-4) is in closure state; When having electric current to flow through in the tripping coil (L3), the driven disconnection of described normally closed switch (KR-4).
4. leakage current detection protection circuit according to claim 1, it is characterized in that: an end of the normally closed switch (KR-4) of described and tripping coil (L3) interlock with pass described induction coil for detection of leakage current (L1) and link to each other with the power firestreak/zero line from magnetic test coil (L2) for detection of the low resistance fault, the other end is by linking to each other with power input zero line/live wire with K switch R-5, resistance (R4) that testing button (TEST) links;
When not having electric current to flow through in the tripping coil (L3), described normally closed switch (KR-4) closure; When having electric current to flow through in the tripping coil (L3), described normally closed switch (KR-4) is disconnected.
5. 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); it is characterized in that: it also comprises a K switch R-5 who links with testing button (TEST)
The end of this K switch R-5 links to each other with zero line (WHITE)/live wire (HOT) of power input (LINE) by resistance (R4); The other end with pass induction coil (L1) for detection of leakage current, link to each other for detection of the power firestreak from magnetic test coil (L2) (the HOT)/zero line (WHITE) of low resistance fault, simultaneously, the other end of this K switch R-5 also links to each other with live wire (the HOT)/zero line (WHITE) of power output end;
It also comprises a K switch R-6 who links with tripping coil (L3) and reset button (RESET);
This K switch R-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 K switch R-6, tripping coil (L3);
When no current flows through in the described tripping coil (L3), a pair of normally-closed contact of K switch R-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 K switch R-6;
When having electric current to flow through in the tripping coil (L3), the a pair of normally-closed contact of K switch R-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 K switch R-6.
6. leakage current detection protection circuit according to claim 5, it is characterized in that: correct wiring when supply socket/attaching plug does not have end-of-life, the function of this circuit will be pressed testing button (TEST) earlier, and the back is by reset button (RESET), and reset button (RESET) resets; Otherwise reset button (RESET) is prevented from resetting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910082965 CN101872957B (en) | 2009-04-27 | 2009-04-27 | Leakage current detection protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910082965 CN101872957B (en) | 2009-04-27 | 2009-04-27 | Leakage current detection protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101872957A CN101872957A (en) | 2010-10-27 |
| CN101872957B true CN101872957B (en) | 2013-10-02 |
Family
ID=42997683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910082965 Expired - Fee Related CN101872957B (en) | 2009-04-27 | 2009-04-27 | Leakage current detection protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101872957B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780205B (en) * | 2011-05-11 | 2015-01-14 | 黄华道 | Electric leakage detecting protection circuit |
| DE102014210589A1 (en) * | 2014-06-04 | 2015-12-17 | Siemens Aktiengesellschaft | Residual current protection device, charging device and method for checking a residual current device |
| CN107438356B (en) * | 2017-08-08 | 2019-08-06 | 芜湖市凯鑫避雷器有限责任公司 | A kind of electric leakage screening arrangement of electric ceramic lightning arrester |
| CN110596514A (en) * | 2019-09-17 | 2019-12-20 | 深圳市晶扬电子有限公司 | Leakage detection circuit, device and method |
| CN111007436A (en) * | 2019-12-27 | 2020-04-14 | 广东电科院能源技术有限责任公司 | Electric leakage detection device |
| CN111277016A (en) * | 2020-03-02 | 2020-06-12 | 桐乡佳车科技股份有限公司 | Anti-electric-shock charging equipment for mobile carrier in textile workshop and using method of charging equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1996679A (en) * | 2005-12-31 | 2007-07-11 | 黄华道 | Display circuit for the life expiration of the current leakage protection jack |
| CN101345375A (en) * | 2007-07-10 | 2009-01-14 | 黄华道 | Novel creepage protecting socket |
-
2009
- 2009-04-27 CN CN 200910082965 patent/CN101872957B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1996679A (en) * | 2005-12-31 | 2007-07-11 | 黄华道 | Display circuit for the life expiration of the current leakage protection jack |
| CN101345375A (en) * | 2007-07-10 | 2009-01-14 | 黄华道 | Novel creepage protecting socket |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2008-204714A 2008.09.04 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101872957A (en) | 2010-10-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102780205B (en) | Electric leakage detecting protection circuit | |
| CN101872957B (en) | Leakage current detection protection circuit | |
| CN101872956B (en) | Leakage current detection protection circuit | |
| CN102611071A (en) | Electric leakage detecting protecting circuit with magnetic locking mechanism | |
| CN102832591A (en) | Electricity leakage detecting protection circuit with function of lightning impulse resistance | |
| CN201422006Y (en) | Electric leakage inspecting protection circuit | |
| CN201194327Y (en) | Leakage detecting protection circuit | |
| CN101388540B (en) | Leakage protection circuit having life end detection and display functions | |
| CN201422007Y (en) | Electric leakage inspecting protection circuit | |
| CN101944716B (en) | Electricity leakage detection protective circuit | |
| CN201466675U (en) | Leakage detection protection circuit | |
| CN201515205U (en) | Earth leakage checking protective circuit | |
| CN201113383Y (en) | Earth leakage protective circuit possessing end-to-life detection and display function | |
| CN201422008Y (en) | Electric leakage inspecting protection circuit | |
| CN101895088A (en) | Leakage detection protection circuit | |
| CN201422009Y (en) | Leakage detection and protection circuit | |
| CN201774225U (en) | Electric leakage detecting protection circuit | |
| CN201422011Y (en) | Leakage-detecting protective circuit | |
| CN201422012Y (en) | Leakage detection and protection circuit with end-of-life detection and display function | |
| CN101931208B (en) | Leakage current detection protection circuit | |
| CN102255277A (en) | Leakage detection protection circuit | |
| CN201018264Y (en) | Electric leakage protection circuit with life termination detecting and display function | |
| CN201774224U (en) | Novel electric-leakage detection protection circuit | |
| CN102340125B (en) | Novel leakage detection protection circuit | |
| CN203180491U (en) | Electric leakage protection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131002 Termination date: 20180427 |