CN101931208A - Leakage current detection protection circuit - Google Patents
Leakage current detection protection circuit Download PDFInfo
- Publication number
- CN101931208A CN101931208A CN2009101477869A CN200910147786A CN101931208A CN 101931208 A CN101931208 A CN 101931208A CN 2009101477869 A CN2009101477869 A CN 2009101477869A CN 200910147786 A CN200910147786 A CN 200910147786A CN 101931208 A CN101931208 A CN 101931208A
- Authority
- CN
- China
- Prior art keywords
- leakage current
- protection circuit
- current detection
- detection protection
- coil
- 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.)
- Granted
Links
Images
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 and a half-wave rectifier diode. The protection circuit is characterized in that one end of the tripping coil is connected with the anode of the controlled silicon V4 and the other end thereof is connected with a live wire output conductive plug bush in a power output plughole on the surface of a power receptacle/a live wire at the power output end; and at the same time, the other end of the tripping coil is also connected with a power live wire running through the induction coil and the self-detection coil by a normally open switch K1. Only after the reset button is pressed or resets, the leakage current detection protection circuit can work in a live state, thus prolonging the service life of the leakage current detection protection circuit.
Description
Technical field
The present invention relates to a kind of leakage current detection protection circuit; 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 simulation leakage current automatically, detect this leakage current detection protection circuit and whether still have creepage protection function.Have only when the reset button that supply socket of the present invention is installed to be pressed and after reset button resets, just charged work of leakage current detection protection circuit of the present invention, thereby, prolong useful life of the present invention.
In addition, leakage current detection protection circuit of the present invention is also to because thunderbolt or the instantaneous pressure that causes of other reasons have protective effect to the destruction that supply socket and the miscellaneous equipment that links to each other with supply socket cause.
Background technology
Along with the supply socket with creepage protection function (be called for short earth leakage protective socket, GFCI) the continuous development of industry, people are to the function of supply socket with creepage protection function, safety in utilization, reliability, useful life etc. requiring more and more higher.This makes that the insider constantly is devoted to study, improve the leakage current detection protection circuit that is installed in the supply socket, makes more succinct, the with better function strength of its circuit, uses safer, more reliable, the longer service life of work.
Summary of the invention
In view of the foregoing, main purpose of the present invention provide a kind of be installed in the supply socket, can whether still have the leakage current detection protection circuit that creepage protection function carries out self check to itself.
Another object of the present invention provides a kind of leakage current detection protection circuit of long service life.
Another purpose of the present invention provides a kind of to because the destruction that thunderbolt or the instantaneous pressure that causes of other reasons cause supply socket and the miscellaneous equipment that links to each other with supply socket has the leakage current detection protection circuit of protective effect.
For achieving the above object; the present invention is by the following technical solutions: a kind of leakage current detection protection circuit; it comprises the induction coil that is used to detect leakage current, be used to detect the low resistance fault from magnetic test coil, control chip, the tripping coil that is built-in with iron core, controllable silicon, halfwave rectifier diode, it is characterized in that:
This leakage current detection protection circuit at least also comprises a pair of normal open switch and a normally closed simulation leakage current generating switch;
One end of described tripping coil links to each other with the silicon controlled anode; Live wire output conduction sleeve in the power supply output plughole of the other end of tripping coil and supply socket surface links to each other, simultaneously, the other end of tripping coil also by a described normal open switch with pass described induction coil and link to each other with power firestreak from magnetic test coil;
The place of working of this leakage current detection protection circuit is exported the conduction sleeve with the zero line in the power supply output plughole of supply socket surface and is linked to each other; Simultaneously, the place of working of leakage current detection protection circuit also by described another normal open switch with pass described induction coil and link to each other with zero-power line from magnetic test coil;
When reset button is in trip status, described a pair of normal open switch is in off-state, live wire output conduction sleeve in the power supply output plughole of tripping coil and supply socket surface links to each other, and passes described induction coil and from the power firestreak disconnection of magnetic test coil; The place of working of leakage current detection protection circuit is exported the conduction sleeve with the zero line in the power supply output plughole of supply socket surface and is linked to each other; Whole leakage current detection protection circuit is not charged;
When reset button is pressed, described a pair of normal open switch closure, the tripping coil normal open switch by closure with pass described induction coil and link to each other with using from the power firestreak of magnetic test coil and the live wire output conduction sleeve in the power supply output plughole of supply socket surface; The work lower margin of leakage current detection protection circuit by described normal open switch with pass described induction coil and the zero line output conduction sleeve in the zero-power line of magnetic test coil and supply socket surface power supply output plughole links to each other; The charged work of leakage current detection protection circuit;
When reset button is in reset mode; described normally closed simulation leakage current generating switch and described a pair of normal open switch all disconnect; switch closure with the reset button interlock; tripping coil links to each other with the live wire that the live wire in the power supply output plughole of supply socket surface is exported conduction sleeve/power output end; the place of working of leakage current detection protection circuit links to each other the charged work of leakage current detection protection circuit with the zero line that the zero line in the power supply output plughole of supply socket surface is exported conduction sleeve/power output end.
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. 2-2 is leakage current detection protection circuit embodiment 5 physical circuit figure of the present invention;
Fig. 2-3 is leakage current detection protection circuit embodiment 6 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 disclosed by the invention.As shown in Figure 1, this leakage current detection protection circuit comprise the induction coil L1 (1000: 1) that is used to detect leakage current, be used to detect the low resistance fault from magnetic test coil L2 (200: 1), control chip IC1 (RV4145), the tripping coil L3 (SOL), the controllable silicon V4 that are built-in with iron core, simulation leakage current generating K switch R-1, with simulation leakage current generating K switch R-5, the halfwave rectifier diode V1 of testing button TEST interlock, two normal open switch K1, K2, power supply output indicator V3, V6.
The live wire HOT of leakage current detection protection circuit power input LINE, zero line WHITE pass the induction coil L1 (1000: 1) that is used to detect leakage current, be used to detect the low resistance fault behind magnetic test coil L2 (200: 1), by linking to each other with live wire, zero line output conduction sleeve in the single-phase three-wire power supply output plughole on mains switch KR-2-1, the KR-2-2 of supply socket reset button RESET interlock and supply socket surface; Simultaneously, the live wire in the single-phase three-wire power supply output plughole on supply socket surface, zero line output conduction sleeve link to each other with live wire HOT, the zero line WHITE of supply socket power output end (load end) LOAD by K switch R-3-1, the KR-3-2 of another group with reset button RESET interlock.
Be used to detect the induction coil L1 (1000: 1) of leakage current, the signal output part from magnetic test coil L2 (200: 1) that is used to detect the low resistance fault links to each other with the signal input part 1,2,3,7 of control chip IC1, the control signal output ends 5 of control chip IC1 links to each other with the trigger electrode of controllable silicon V4.The working power input 6 of control chip IC 1 passes through halfwave rectifier diode V1, resistance R 1, tripping coil L3, links to each other with the K switch R-2-1 of reset button interlock and the live wire output conduction sleeve in the power supply output plughole of supply socket surface.The place of working pin 4 of control chip IC1 links to each other with power ground.
The anode of controllable silicon V4 passes through tripping coil L3, links to each other with the K switch R-2-1 of reset button interlock and the live wire output conduction sleeve in the power supply output plughole of supply socket surface, and the negative electrode of controllable silicon V4 links to each other with power ground.
As shown in Figure 1, the end of tripping coil L3 links to each other with the anode of controllable silicon V4; The other end of tripping coil L3 links to each other by exporting the conduction sleeve with the K switch R-2-1 of reset button interlock with the live wire in the power supply output plughole of supply socket surface, simultaneously, the other end of tripping coil L3 also by a normal open switch K1 with pass the induction coil L1 (1000: 1) that is used to detect leakage current and link to each other with the power firestreak HOT that is used to detect the low resistance fault from magnetic test coil L2.
When reset button RESET is in trip status, normal open switch K1 is in off-state, live wire output conduction sleeve in the power supply output plughole of tripping coil L3 and supply socket surface links to each other, and not with pass the induction coil L1 (1000: 1) that is used to detect leakage current and link to each other with the power firestreak HOT that is used to detect the low resistance fault from magnetic test coil L2.Because the leakage current detection protection circuit output does not have power supply output, so whole leakage current detection protection circuit is not charged, tripping coil L3, controllable silicon V4, control chip IC1 do not work.This design cuts down the consumption of energy on the one hand, on the other hand because electric elements are not charged, so, prolong the useful life of electric elements, thereby prolonged the useful life of leakage current detection protection circuit.
When reset button RESET is pressed, normal open switch K1 closure, the normal open switch K1 of tripping coil L3 by closure with pass the induction coil L1 (1000: 1) that is used for detecting leakage current and be used to detect linking to each other of low resistance fault from the power firestreak HOT of magnetic test coil L2 and the live wire output conduction sleeve of supply socket surface power supply output plughole; The anode of controllable silicon V4 by tripping coil L3 with pass the induction coil L1 (1000: 1) that is used for detecting leakage current and be used to detect linking to each other of low resistance fault from the power firestreak HOT of magnetic test coil L2 and the live wire output conduction sleeve of supply socket surface power supply output plughole; The working power pin 6 of control chip IC1 by resistance R 1, half-wave arrangement diode V1, tripping coil L3 with pass the live wire that is used for detecting the induction coil L1 (1000: 1) of leakage current and is used to detect the low resistance fault and export and conduct electricity sleeve and link to each other the charged work of leakage current detection protection circuit from the power firestreak HOT of magnetic test coil L2 and supply socket surface power supply output plughole.
When reset button RESET was in reset mode, normal open switch K1 disconnected, with K switch R-2-1, the KR-3-1 closure of reset button RESET interlock.Tripping coil L3 links to each other with the live wire that the live wire in the power supply output plughole of supply socket surface is exported conduction sleeve/power output end LOAD; The anode of controllable silicon V4 links to each other with the live wire that the live wire in the power supply output plughole of supply socket surface is exported conduction sleeve/power output end LOAD by tripping coil L3; The working power pin 6 of control chip IC1 links to each other the charged work of leakage current detection protection circuit by resistance R 1, half-wave arrangement diode V1, tripping coil L3 with the live wire that the live wire in the power supply output plughole of supply socket surface is exported conduction sleeve/power output end LOAD.
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 of K switch R-5 links to each other with the live wire HOT of power output end.Push testing button TEST; K switch R-5 closure; the live wire HOT of power output end links to each other with the zero line WHITE of power input through K switch R-5, the current-limiting resistance R4 of closure; form the closed-loop path; manually produce the simulation leakage current; if this moment, leakage current detection protection circuit did not have end-of-life, then this leakage current detection protection circuit output of cutting off the electricity supply.Discharge testing button TEST, K switch R-5 disconnects, and the simulation leakage current disappears, and normally closed switch KR-1 changes closure state into by off-state.
As shown in Figure 1, this leakage current detection protection circuit comprises that also one produces simulation leakage current circuit automatically.Should produce simulation leakage current circuit automatically is made of the simulation leakage current generating K switch R-1 and the current-limiting resistance R4 that connect.The end of simulation leakage current generating K switch R-1 links to each other with the zero line or the live wire of power input through current-limiting resistance R4, the other end with pass the induction coil L1 (1000: 1) that is used to detect leakage current and link to each other with power firestreak HOT or the zero line WHITE that are used to detect the low resistance fault from magnetic test coil L2 (200: 1).
Simulation leakage current generating K switch R-1 is a normally closed switch.After the power input of leakage current detection protection circuit and the power line in the wall connect; the zero line WHITE of power input LINE through current-limiting resistance R4, closed simulation leakage current generating K switch R-1 with pass induction coil L1 (1000: 1) and link to each other with power firestreak HOT from magnetic test coil L2 (200: 1); form the closed-loop path, produce the simulation leakage current automatically.
At this moment, push reset button RESET, normal open switch K1 closure, tripping coil L3 through the K switch 1 of closure with pass the induction coil L1 (1000: 1) that is used to detect leakage current and link to each other with the power firestreak HOT that is used to detect the low resistance fault from magnetic test coil L2 (200: 1); The anode of controllable silicon V4 by tripping coil L3, closed normal open switch K1 with pass induction coil L1 (1000: 1) and link to each other with power firestreak HOT from magnetic test coil L2; The working power pin 6 of control chip IC1 is by resistance R 1, half-wave arrangement diode V1, tripping coil L3, closed normal open switch K1 and pass induction coil L1 (1000: 1) and link to each other with power firestreak HOT from magnetic test coil L2, simultaneously, the working power pin 6 of control chip IC1 also links to each other with live wire output conduction sleeve in the power supply output plughole of supply socket surface by resistance R 1, half-wave arrangement diode V1, tripping coil L3, closed normal open switch K1.If leakage current detection protection circuit does not have end-of-life, the then controllable silicon V4 conducting that is triggered, there is electric current to flow through in the tripping coil L3, produce magnetic field in the tripping coil L3, be built in the iron core action in the tripping coil L3, make the mechanical device action in the supply socket, snap close is opened and is lockable, and waits for that reset button resets; Simultaneously, the mechanical device action in the supply socket disconnects simulation leakage current generating K switch R-1, and the simulation leakage current disappears.Push reset button RESET, reset button resets.
After reset button RESET resetted, normal open switch K1 disconnected, with K switch R-2-1, the KR-3-1 closure of reset button RESET interlock.Tripping coil L3 links to each other with the live wire that the live wire in the power supply output plughole of supply socket surface is exported conduction sleeve/power output end LOAD; The anode of controllable silicon V4 links to each other with the live wire that the live wire in the power supply output plughole of supply socket surface is exported conduction sleeve/power output end LOAD by tripping coil L3; The working power pin 6 of control chip IC1 links to each other with the live wire that the live wire in the power supply output plughole of supply socket surface is exported conduction sleeve/power output end LOAD by resistance R 1, half-wave arrangement diode V1, tripping coil L3; the charged work of leakage current detection protection circuit, normally closed simulation leakage current generating K switch R-1 and normal open switch K1 disconnect.After leakage current detection protection circuit detects leakage current; controllable silicon V4 conducting; produce magnetic field in the tripping coil L3; be built in the iron core action in the tripping coil L3; make the mechanical device action in the supply socket; thereby reset button RESET is threaded off, with K switch R-2-1, KR-2-2, KR-3-1, the KR-3-2 disconnection of reset button RESET interlock, the output of cutting off the electricity supply.Simultaneously, simulation leakage current generating K switch R-1 changes closure state into from off-state again, repeats a process.
As shown in Figure 1, the place of working of leakage current detection protection circuit links to each other with the zero line output conduction sleeve of supply socket surface power supply output plughole as the earth terminal from magnetic test coil L2 (200: 1) that is used for detecting the low resistance fault, the ground pin 4 of control chip IC1; Simultaneously, also by another normal open switch K2 with pass the induction coil L1 (1000: 1) that is used to detect leakage current and link to each other with the zero-power line WHITE that is used to detect the low resistance fault from magnetic test coil L2 (200: 1).
When reset button RESET was in trip status and reset mode, normal open switch K2 was in off-state, and the place of working of leakage current detection protection circuit is exported the conduction sleeve with the zero line in the power supply output plughole of supply socket surface and linked to each other.When reset button RESET is pressed; normal open switch K2 closure, the place of working of leakage current detection protection circuit with pass the induction coil L1 (1000: 1) that is used to detect leakage current and link to each other with the zero-power line WHITE that is used to detect the low resistance fault from magnetic test coil L2 (200: 1).
Fig. 1-1 is leakage current detection protection circuit embodiment 2 physical circuit figure of the present invention.As shown in the figure, leakage current detection protection circuit shown in Fig. 1-1 and leakage current detection protection circuit operation principle shown in Figure 1 are identical, structure is basic identical, and difference is: the shared contact of normal open switch K1, the K2 in the leakage current detection protection circuit shown in Figure 1 and K switch R-2-1, KR-2-2; And normal open switch K1, K2 in the leakage current detection protection circuit shown in Figure 2 and K switch R-2-1, KR-2-2 are separate switches.
Fig. 2 is leakage current detection protection circuit embodiment 3 physical circuit figure of the present invention.As shown in the figure, leakage current detection protection circuit shown in Figure 2 and leakage current detection protection circuit operation principle shown in Figure 1 are identical, structure is basic identical, and difference is: different with the connected mode of K switch R-2-1 in the main circuit power supply of reset button RESET interlock and K switch R-3-1; Different with the connected mode of K switch R-2-2 in the main circuit power supply of reset button RESET interlock and K switch R-3-2.
Fig. 2-1 is leakage current detection protection circuit embodiment 4 physical circuit figure of the present invention.As shown in the figure, leakage current detection protection circuit shown in Fig. 2-1 and leakage current detection protection circuit operation principle shown in Figure 1 are identical, structure is basic identical, and difference is: normal open switch K1 and the shared contact of K switch R-3-1 in the leakage current detection protection circuit shown in Fig. 2-1; The shared contact of normal open switch K2 and K switch R-3-2; And normal open switch K1 and the shared contact of K switch R-2-1 in the leakage current detection protection circuit shown in Figure 1; The shared contact of normal open switch K2 and K switch R-2-2.
The end of tripping coil L3 links to each other with the anode of controllable silicon V4; The other end of tripping coil L3 is exported the conduction sleeve with the live wire in the power supply output plughole of supply socket surface and is linked to each other, simultaneously, the other end of tripping coil L3 also by a normal open switch K1 with pass the induction coil L1 (1000: 1) that is used to detect leakage current and link to each other with the power firestreak HOT that is used to detect the low resistance fault from magnetic test coil L2.
When reset button RESET is in trip status; normal open switch K1 is in off-state; tripping coil L3 exports the conduction sleeve with the live wire in the power supply output plughole of supply socket surface and links to each other; and not with pass the induction coil L1 (1000: 1) that is used to detect leakage current and link to each other with the power firestreak HOT that is used to detect the low resistance fault from magnetic test coil L2; whole leakage current detection protection circuit is not charged, and tripping coil L3, controllable silicon V4, control chip IC1 do not work.
When reset button RESET is pressed, normal open switch K1 closure, the normal open switch K1 of tripping coil L3 by closure with pass the induction coil L1 (1000: 1) that is used for detecting leakage current and be used to detect linking to each other of low resistance fault from the power firestreak HOT of magnetic test coil L2 and the live wire output conduction sleeve of supply socket surface power supply output plughole; The anode of controllable silicon V4 by tripping coil L3 with pass the induction coil L1 (1000: 1) that is used for detecting leakage current and be used to detect linking to each other of low resistance fault from the power firestreak HOT of magnetic test coil L2 and the live wire output conduction sleeve of supply socket surface power supply output plughole; The working power pin 6 of control chip IC1 by resistance R 1, half-wave arrangement diode V1, tripping coil L3 with pass the live wire that is used for detecting the induction coil L1 (1000: 1) of leakage current and is used to detect the low resistance fault and export and conduct electricity sleeve and link to each other the charged work of leakage current detection protection circuit from the power firestreak HOT of magnetic test coil L2 and supply socket surface power supply output plughole.
When reset button RESET was in reset mode, simulation leakage current generating K switch R-1, normal open switch K1 disconnected, with K switch R-2-1, the KR-3-1 closure of reset button RESET interlock.Tripping coil L3 links to each other with the live wire that the live wire in the power supply output plughole of supply socket surface is exported conduction sleeve/power output end LOAD; The anode of controllable silicon V4 links to each other with the live wire that the live wire in the power supply output plughole of supply socket surface is exported conduction sleeve/power output end LOAD by tripping coil L3; The working power pin 6 of control chip IC1 links to each other the charged work of leakage current detection protection circuit by resistance R 1, half-wave arrangement diode V1, tripping coil L3 with the live wire that the live wire in the power supply output plughole of supply socket surface is exported conduction sleeve/power output end LOAD.
Fig. 2-2 is leakage current detection protection circuit embodiment 5 physical circuit figure of the present invention.As shown in the figure; leakage current detection protection circuit operation principle shown in leakage current detection protection circuit shown in Fig. 2-2 and Fig. 1-1 is identical; structure is basic identical, and difference is: different with the connected mode of the K switch R-2-1 of reset button RESET interlock and K switch R-3-1, K switch R-2-2 and K switch R-3-2.
Fig. 2-3 is leakage current detection protection circuit embodiment 6 physical circuit figure of the present invention.As shown in the figure, the leakage current detection protection circuit operation principle shown in the leakage current detection protection circuit shown in Fig. 2-3 and Fig. 2-2 is identical, and structure is basic identical.
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 between the live wire of leakage current detection protection circuit power output end and zero line and is used to represent whether supply socket has the power supply output indicator V3 (LED1) and the V6 (LED2) of power supply output.When supply socket had power supply output, V3 and V6 were all bright; Otherwise V3 and V6 do not work.In order to simplify circuit, also an indicator light V3 or V6 can only be installed.
In order to improve the useful life of supply socket; avoid because the destruction that the instantaneous pressure that thunderbolt or other reasons cause causes supply socket; as shown in the figure; lightning-arrest sheet metal M3 in the tip that leakage current detection protection circuit disclosed by the invention is connected with one group of right-angled triangle that is used to discharge or isoceles triangle shape at live wire HOT and the zero line WHITE place of power output end LOAD and M4; most advanced and sophisticated lightning-arrest sheet metal M1 and M2, M3 and M4 quite place, and the distance between two lightning-arrest sheet metal lower inside in tip is greater than the distance between its upper inner.
As shown in the figure; the leakage current detection protection circuit disclosed by the invention also live wire output conduction sleeve in the power supply output plughole of supply socket surface and zero line output conduction sleeve place is connected with the lightning-arrest sheet metal M1 in tip and the M2 of one group of right-angled triangle that is used to discharge or isoceles triangle shape; most advanced and sophisticated lightning-arrest sheet metal M1 and M2 quite place, and the distance between two lightning-arrest sheet metal lower inside in tip is greater than the distance between its upper inner.
When the live wire of power output end and zero line because thunderbolt or other reasons when causing instantaneous pressure; the air dielectric that is connected to the lightning-arrest sheet metal in tip at output live wire place and is connected between the lightning-arrest sheet metal in tip at output zero line place is breakdown; form atmospherical discharges; most of high pressure consumes by lightning-arrest sheet metal; the residue sub-fraction consumes by tripping coil L3, piezo-resistance MOV; thereby protected leakage current detection protection circuit/supply socket, and the safe operation of the miscellaneous equipment that links to each other with supply socket.
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 power input and the wall connects, can produce the detection electric current automatically, be used to detect leakage current detection protection circuit/supply socket and whether still have the i.e. end-of-life whether of creepage protection function.
(2) only push after reset button RESET or reset button reset, just charged work of leakage current detection protection circuit, thus prolong useful life of leakage current detection protection circuit.
(3) has the destruction that anti-lightning strike and instantaneous pressure that other reasons causes causes supply socket and the miscellaneous equipment that links to each other with this supply socket.
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 (7)
1. leakage current detection protection circuit; it comprises the induction coil (L1) that is used to detect leakage current, be used to detect the low resistance fault from magnetic test coil (L2), control chip (IC 1), the tripping coil (L3) that is built-in with iron core, controllable silicon (V4), halfwave rectifier diode (V1), it is characterized in that:
This leakage current detection protection circuit at least also comprises a pair of normal open switch (K1, K2) and a normally closed simulation leakage current generating switch (KR-1);
One end of described tripping coil (L3) links to each other with the anode of controllable silicon (V4); The other end of tripping coil (L3) is exported the conduction sleeve with the live wire in the power supply output plughole of supply socket surface and is linked to each other, simultaneously, the other end of tripping coil (L3) also by a described normal open switch (K1) with pass described induction coil (L1) and link to each other with power firestreak (HOT) from magnetic test coil (L2);
The place of working of this leakage current detection protection circuit is exported the conduction sleeve with the zero line in the power supply output plughole of supply socket surface and is linked to each other; Simultaneously, the place of working of leakage current detection protection circuit also by described another normal open switch (K2) with pass described induction coil (L1) and link to each other with zero-power line (WHITE) from magnetic test coil (L2);
When reset button (RESET) when being in trip status, described a pair of normal open switch (K1 and K2) is in off-state, live wire output conduction sleeve in the power supply output plughole of tripping coil (L3) and supply socket surface links to each other, and passes described induction coil (L1) and from power firestreak (HOT) disconnection of magnetic test coil (L2); The place of working of leakage current detection protection circuit is exported the conduction sleeve with the zero line in the power supply output plughole of supply socket surface and is linked to each other; Whole leakage current detection protection circuit is not charged;
When reset button (RESET) when being pressed, described a pair of normal open switch (K1 and K2) closure, tripping coil (L3) by closed normal open switch (K1) with pass described induction coil (L1) and conduct electricity sleeve from the power firestreak (HOT) of magnetic test coil (L2) and the live wire output in the power supply output plughole of supply socket surface and link to each other with using; The work lower margin of leakage current detection protection circuit by described normal open switch (K2) with pass described induction coil (L1) and the zero line output conduction sleeve in the zero-power line (WHITE) of magnetic test coil (L2) and supply socket surface power supply output plughole links to each other; The charged work of leakage current detection protection circuit;
When reset button (RESET) when being in reset mode; described normally closed simulation leakage current generating switch (KR-1) and described a pair of normal open switch (K1 and K2) all disconnect; switch (KR-2-1 with reset button (RESET) interlock; KR-3-1) closure; tripping coil (L3) links to each other with the live wire that the live wire in the power supply output plughole of supply socket surface is exported conduction sleeve/power output end (LOAD); the place of working of leakage current detection protection circuit links to each other the charged work of leakage current detection protection circuit with the zero line that the zero line in the power supply output plughole of supply socket surface is exported conduction sleeve/power output end (LOAD).
2. according to the described leakage current detection protection circuit of claim 1, it is characterized in that: the anode of described controllable silicon (V4) is exported the conduction sleeve by the live wire in described tripping coil (L3) and the supply socket surface power supply output plughole and is linked to each other; Simultaneously, the anode of described controllable silicon (V4) is by described tripping coil (L3), a described normal open switch (K1) and pass induction coil (L1) and link to each other with power firestreak (HOT) from magnetic test coil (L2);
When reset button (RESET) when being in trip status, described normal open switch (K1) is in off-state, and the anode of described controllable silicon (V4) links to each other by the live wire output conduction sleeve in described tripping coil (L3) and the supply socket surface power supply output plughole;
When reset button (RESET) when being pressed, described normal open switch (K1) closure, the anode of described controllable silicon (V4) are by described tripping coil (L3), closed described normal open switch (K1) and pass described induction coil (L1) and conduct electricity sleeve from the power firestreak (HOT) of magnetic test coil (L2) and the live wire output in the power supply output plughole of supply socket surface and link to each other with using;
When reset button (RESET) when being in reset mode, described normally closed simulation leakage current generating switch (KR-1) and described normal open switch (K1) all disconnect, with switch (KR-2-1, the KR-3-1) closure of reset button (RESET) interlock, the live wire that the anode of described controllable silicon (V4) is exported conduction sleeve/power output end (LOAD) by the live wire in described tripping coil (L3) and the supply socket surface power supply output plughole links to each other.
3. according to the described leakage current detection protection circuit of claim 2, it is characterized in that: the working power pin (6) of described control chip (IC1) is exported the conduction sleeve by resistance (R1), half-wave arrangement diode (V1), tripping coil (L3) with the live wire in the power supply output plughole of supply socket surface and is linked to each other; Simultaneously, the working power pin (6) of described control chip (IC1) is by resistance (R1), half-wave arrangement diode (V1), tripping coil (L3), a described normal open switch (K1) and pass induction coil (L1) and link to each other with power firestreak (HOT) from magnetic test coil (L2);
When reset button (RESET) when being in trip status, described normal open switch (K1, K2) is in off-state, and the working power pin (6) of described control chip (IC 1) is exported the conduction sleeve by resistance (R1), half-wave arrangement diode (V1), tripping coil (L3) with the live wire in the power supply output plughole of supply socket surface and linked to each other;
When reset button (RESET) when being pressed, described normal open switch (K1) closure, the working power pin (6) of described control chip (IC 1) are by resistance (R1), half-wave arrangement diode (V1), tripping coil (L3), closed described normal open switch (K1) and pass described induction coil (L1) and conduct electricity sleeve from the power firestreak (HOT) of magnetic test coil (L2) and the live wire output in the power supply output plughole of supply socket surface and link to each other with using;
When reset button (RESET) when being in reset mode, described normally closed simulation leakage current generating switch (KR-1) and described normal open switch (K1, K2) all disconnect, with switch (KR-2-1, the KR-3-1) closure of reset button (RESET) interlock, the working power pin (6) of described control chip (IC1) links to each other with the live wire that the live wire in the power supply output plughole of supply socket surface is exported conduction sleeve/power output end (LOAD) by resistance (R1), half-wave arrangement diode (V1), tripping coil (L3).
4. according to claim 1 or 2 or 3 described leakage current detection protection circuits, it is characterized in that: this leakage current detection protection circuit comprises that one produces simulation leakage current circuit automatically;
Should produce simulation leakage current circuit automatically is made of described simulation leakage current generating switch (KR-1) of connecting and current-limiting resistance (R4); One end of described simulation leakage current generating switch (KR-1) links to each other with the zero line/live wire of power input through described current-limiting resistance (R4), and the other end links to each other with the power firestreak/zero line from magnetic test coil (L2) that passes the induction coil (L 1) that is used to detect leakage current, be used to detect the low resistance fault;
Described simulation leakage current generating switch (KR-1) is a normally closed switch; Because described another normal open switch (K2) closure, after the power input of leakage current detection protection circuit and the power line in the wall connect, zero line/the live wire of power input is through current-limiting resistance (R4), closed simulation leakage current generating switch (KR-1) and pass the induction coil (L1) that is used to detect leakage current, the power firestreak/zero line from magnetic test coil (L2) that is used to detect the low resistance fault links to each other, form the closed-loop path, automatically produce the simulation leakage current, detect whether end-of-life of leakage current detection protection circuit;
If leakage current detection protection circuit does not have end-of-life, the then action of the mechanical device in the supply socket, snap close is opened, and is lockable, and waits for that reset button resets, and described simulation leakage current generating switch (KR-1) disconnects, and the simulation leakage current disappears; Otherwise, stop reset button to reset.
5. leakage current detection protection circuit according to claim 4 is characterized in that: this leakage current detection protection circuit also includes the lightning-arrest sheet metal (M3 and M4) in tip of the right-angled triangle that is used to discharge or isoceles triangle shape;
The described tip sheet metal (M3 and M4) of taking shelter from the thunder links to each other with zero line with the live wire of leakage current detection protection circuit power output end respectively; the described tip sheet metal (M3 and M4) of taking shelter from the thunder is quite placed, and the distance between two lightning-arrest sheet metal lower inside in tip is greater than the distance between its upper inner.
6. according to claim 4 or 5 described leakage current detection protection circuits, it is characterized in that: this leakage current detection protection circuit also includes the lightning-arrest sheet metal (M1 and M2) in tip of one group of right-angled triangle that is used to discharge or isoceles triangle shape;
Described tip take shelter from the thunder sheet metal (M1 and M2) respectively with supply socket surface power supply output plughole in live wire output conduction sleeve link to each other with zero line output conduction sleeve;
The described tip sheet metal (M1 and M2) of taking shelter from the thunder is quite placed, and the distance between two lightning-arrest sheet metal lower inside in tip is greater than the distance between its upper inner.
7. leakage current detection protection circuit; it comprises the induction coil (L1) that is used to detect leakage current, be used to detect the low resistance fault from magnetic test coil (L2), control chip (IC 1), the tripping coil (L3) that is built-in with iron core, controllable silicon (V4), it is characterized in that:
This leakage current detection protection circuit comprises a pair of normal open switch (K1, K2) and a normally closed simulation leakage current generating switch (KR-1) at least.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910147786 CN101931208B (en) | 2009-06-19 | 2009-06-19 | Leakage current detection protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910147786 CN101931208B (en) | 2009-06-19 | 2009-06-19 | Leakage current detection protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101931208A true CN101931208A (en) | 2010-12-29 |
| CN101931208B CN101931208B (en) | 2013-05-08 |
Family
ID=43370224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910147786 Expired - Fee Related CN101931208B (en) | 2009-06-19 | 2009-06-19 | Leakage current detection protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101931208B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780205A (en) * | 2011-05-11 | 2012-11-14 | 黄华道 | Electric leakage detecting protection circuit |
| CN102832593A (en) * | 2011-06-17 | 2012-12-19 | 黄华道 | Electric leakage detection protection circuit with lightning impulse preventing/resisting function |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201018264Y (en) * | 2007-02-14 | 2008-02-06 | 黄华道 | Electric leakage protection circuit with life termination detecting and display function |
| CN201113383Y (en) * | 2007-09-14 | 2008-09-10 | 黄华道 | Earth leakage protective circuit possessing end-to-life detection and display function |
-
2009
- 2009-06-19 CN CN 200910147786 patent/CN101931208B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780205A (en) * | 2011-05-11 | 2012-11-14 | 黄华道 | Electric leakage detecting protection circuit |
| CN102780205B (en) * | 2011-05-11 | 2015-01-14 | 黄华道 | Electric leakage detecting protection circuit |
| CN102832593A (en) * | 2011-06-17 | 2012-12-19 | 黄华道 | Electric leakage detection protection circuit with lightning impulse preventing/resisting function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101931208B (en) | 2013-05-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102780205B (en) | Electric leakage detecting protection circuit | |
| CN101872956B (en) | Leakage current detection protection circuit | |
| CN101872957B (en) | Leakage current detection protection circuit | |
| 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 | |
| CN101976815B (en) | Loaded multifunctional protection circuit | |
| CN201515205U (en) | Earth leakage checking protective circuit | |
| CN101388540A (en) | Leakage protection circuit having life end detection and display functions | |
| CN201774225U (en) | Electric leakage detecting protection circuit | |
| CN201466675U (en) | Leakage detection protection circuit | |
| CN101944716B (en) | Electricity leakage detection protective circuit | |
| CN101931208B (en) | Leakage current detection protection circuit | |
| CN101895088A (en) | Leakage detection protection circuit | |
| CN201422007Y (en) | Electric leakage inspecting protection circuit | |
| CN201422009Y (en) | Leakage detection and protection circuit | |
| CN201113383Y (en) | Earth leakage protective circuit possessing end-to-life detection and display function | |
| CN102255277A (en) | Leakage detection protection circuit | |
| CN201422011Y (en) | Leakage-detecting protective circuit | |
| CN201966581U (en) | Electric leakage detection and protection circuit | |
| CN201422012Y (en) | Leakage detection and protection circuit with end-of-life detection and display function | |
| CN201774224U (en) | Novel electric-leakage detection protection circuit | |
| CN201422008Y (en) | Electric leakage inspecting protection circuit | |
| CN102340125B (en) | Novel leakage detection protection circuit | |
| CN201018264Y (en) | Electric leakage protection circuit with life termination detecting and display function |
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: 20130508 Termination date: 20180619 |