CN101931208B - Leakage current detection protection circuit - Google Patents
Leakage current detection protection circuit Download PDFInfo
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- CN101931208B CN101931208B CN 200910147786 CN200910147786A CN101931208B CN 101931208 B CN101931208 B CN 101931208B CN 200910147786 CN200910147786 CN 200910147786 CN 200910147786 A CN200910147786 A CN 200910147786A CN 101931208 B CN101931208 B CN 101931208B
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Abstract
The invention discloses a leakage current detection protection circuit, comprising an induction coil used for detecting the leakage current, a self-detection coil used for detecting the low resistance fault, a control chip, a tripping coil with an iron core inside, controlled silicon 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 wall connects; can automatically produce the simulation leakage current, detect this leakage current detection protection circuit and whether still have creepage protection function.Only have to be pressed and after reset button resets when the reset button that supply socket of the present invention is installed, just charged work of leakage current detection protection circuit of the present invention, thereby, extend 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 is connected with supply socket cause.
Background technology
Along with the supply socket with creepage protection function (be called for short earth leakage protective socket, the GFCI) 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 the insider constantly be devoted to study, improve the leakage current detection protection circuit that is arranged in 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 be to provide a kind of be arranged in 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 is to provide a kind of leakage current detection protection circuit of long service life.
Another purpose of the present invention is to provide a kind of leakage current detection protection circuit that the destruction that supply socket and the miscellaneous equipment that is connected with supply socket is caused due to thunderbolt or the instantaneous pressure that causes of other reasons is had 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 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, 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 is connected 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 is connected, simultaneously, the other end of tripping coil also by a described normal open switch with pass described induction coil and be connected 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 surperficial power supply output plughole of supply socket and is connected; Simultaneously, the place of working of leakage current detection protection circuit also by described another normal open switch with pass described induction coil and be connected 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 is connected, 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 surperficial power supply output plughole of supply socket and is connected; Whole leakage current detection protection circuit is not charged;
When reset button is pressed, described a pair of normal open switch is closed, the normal open switch of tripping coil by closure with pass described induction coil and use the live wire output conduction sleeve in the power firestreak of magnetic test coil and supply socket surface power supply output plughole to be connected; 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 is connected; 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; closed with the switch of reset button interlock; tripping coil is connected with the live wire that the live wire in the surperficial power supply output plughole of supply socket is exported conduction sleeve/power output end; the place of working of leakage current detection protection circuit is connected with the zero line that the zero line in the surperficial power supply output plughole of supply socket is exported conduction sleeve/power output end, the charged work of leakage current detection protection circuit.
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 are leakage current detection protection circuit embodiment 5 physical circuit figure of the present invention;
Fig. 2-3 are 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 arranged in supply socket 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), 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 induction coil L1 (1000: 1) for detection of leakage current, for detection of the low resistance fault after magnetic test coil L2 (200: 1), by being connected 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 are connected 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.
For detection of the induction coil L1 (1000: 1) of leakage current, be connected 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 is connected with the trigger electrode of controllable silicon V4.The working power input 6 of control chip IC1 passes through halfwave rectifier diode V1, resistance R 1, tripping coil L3, is connected with the K switch R-2-1 of reset button interlock and the live wire output conduction sleeve in the surperficial power supply output plughole of supply socket.The place of working pin 4 of control chip IC1 is connected with power ground.
The anode of controllable silicon V4 passes through tripping coil L3, is connected with the K switch R-2-1 of reset button interlock and the live wire output conduction sleeve in the surperficial power supply output plughole of supply socket, and the negative electrode of controllable silicon V4 is connected with power ground.
As shown in Figure 1, the end of tripping coil L3 is connected with the anode of controllable silicon V4; The other end of tripping coil L3 is connected by exporting the conduction sleeve with the K switch R-2-1 of reset button interlock with the live wire in the surperficial power supply output plughole of supply socket, simultaneously, the other end of tripping coil L3 also is connected with the power firestreak HOT from magnetic test coil L2 for detection of the low resistance fault with passing for detection of the induction coil L1 (1000: 1) of leakage current by a normal open switch K1.
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 is connected, and is not connected with the power firestreak HOT from magnetic test coil L2 for detection of the low resistance fault with passing for detection of the induction coil L1 (1000: 1) of leakage current.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 reduces energy consumption on the one hand, on the other hand because electric elements are not charged, so, extend the useful life of electric elements, thereby extended the useful life of leakage current detection protection circuit.
When reset button RESET is pressed, normal open switch K1 is closed, and the normal open switch K1 of tripping coil L3 by closure is connected with passing for detection of the induction coil L1 (1000: 1) of leakage current and conduct electricity sleeve for detection of the live wire output in the power firestreak HOT of magnetic test coil L2 and supply socket surface power supply output plughole of low resistance fault; The anode of controllable silicon V4 is connected with passing for detection of the induction coil L1 (1000: 1) of leakage current with for detection of the live wire output conduction sleeve in the power firestreak HOT of magnetic test coil L2 and supply socket surface power supply output plughole of low resistance fault by tripping coil L3; The working power pin 6 of control chip IC1 by resistance R 1, half-wave arrange diode V1, tripping coil L3 with pass for detection of the induction coil L1 (1000: 1) of leakage current with conduct electricity sleeve for detection of the live wire output in the power firestreak HOT of magnetic test coil L2 and supply socket surface power supply output plughole of low resistance fault and be connected, the charged work of leakage current detection protection circuit.
When reset button RESET was in reset mode, normal open switch K1 disconnected, and is closed with K switch R-2-1, the KR-3-1 of reset button RESET interlock.Tripping coil L3 is connected with the live wire that the live wire in the surperficial power supply output plughole of supply socket is exported conduction sleeve/power output end LOAD; The anode of controllable silicon V4 is connected with the live wire that the live wire in the surperficial power supply output plughole of supply socket is exported conduction sleeve/power output end LOAD by tripping coil L3; The working power pin 6 of control chip IC1 arranges diode V1, tripping coil L3 by resistance R 1, half-wave and is connected with the live wire that the live wire in the surperficial power supply output plughole of supply socket is exported conduction sleeve/power output end LOAD, the charged work of leakage current detection protection circuit.
Be connected 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 is connected with the live wire HOT of power output end.Press testing button TEST; K switch R-5 is closed; the live wire HOT of power output end is connected 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, 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 automatically produce simulation leakage current circuit 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 is connected with zero line or the live wire of power input through current-limiting resistance R4, and the other end is connected with power firestreak HOT or zero line WHITE from magnetic test coil L2 (200: 1) for detection of the low resistance fault with passing for detection of the induction coil L1 (1000: 1) of leakage current.
Simulation leakage current generating K switch R-1 is normally closed switch.After the power input of leakage current detection protection circuit and the power line in 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 be connected with power firestreak HOT from magnetic test coil L2 (200: 1); form the closed-loop path, automatically produce the simulation leakage current.
At this moment, press reset button RESET, normal open switch K1 is closed, and tripping coil L3 is connected with the power firestreak HOT from magnetic test coil L2 (200: 1) for detection of the low resistance fault with passing for detection of the induction coil L1 (1000: 1) of leakage current through the K switch 1 of closure; The anode of controllable silicon V4 by tripping coil L3, closed normal open switch K1 with pass induction coil L1 (1000: 1) and be connected with power firestreak HOT from magnetic test coil L2; The working power pin 6 of control chip IC1 arranges diode V1, tripping coil L3, closed normal open switch K1 by resistance R 1, half-wave and passes induction coil L1 (1000: 1) and is connected with power firestreak HOT from magnetic test coil L2, simultaneously, the working power pin 6 of control chip IC1 arranges diode V1, tripping coil L3, closed normal open switch K1 by resistance R 1, half-wave and also is connected with live wire output conduction sleeve in the power supply output plughole of supply socket surface.If leakage current detection protection circuit does not have end-of-life, the controllable silicon V4 conducting that is triggered, there is electric current to flow through in tripping coil L3, produce magnetic field in tripping coil L3, be built in the iron core action in tripping coil L3, make the mechanical device action in supply socket, snap close is opened and is lockable, and waits for that reset button resets; Simultaneously, the mechanical device action in supply socket disconnects simulation leakage current generating K switch R-1, and the simulation leakage current disappears.Press reset button RESET, reset button resets.
After reset button RESET resetted, normal open switch K1 disconnected, and is closed with K switch R-2-1, the KR-3-1 of reset button RESET interlock.Tripping coil L3 is connected with the live wire that the live wire in the surperficial power supply output plughole of supply socket is exported conduction sleeve/power output end LOAD; The anode of controllable silicon V4 is connected with the live wire that the live wire in the surperficial power supply output plughole of supply socket is exported conduction sleeve/power output end LOAD by tripping coil L3; The working power pin 6 of control chip IC1 arranges diode V1, tripping coil L3 by resistance R 1, half-wave and is connected with the live wire that the live wire in the surperficial power supply output plughole of supply socket is exported conduction sleeve/power output end LOAD; 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 tripping coil L3; be built in the iron core action in tripping coil L3; make the mechanical device action in 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 is as being connected for detection of the zero line output conduction sleeve in the ground pin 4 of the earth terminal from magnetic test coil L2 (200: 1) of low resistance fault, control chip IC1 and supply socket surface power supply output plughole; Simultaneously, also be connected with the zero-power line WHITE from magnetic test coil L2 (200: 1) for detection of the low resistance fault with passing for detection of the induction coil L1 (1000: 1) of leakage current by another normal open switch K2.
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 surperficial power supply output plughole of supply socket and is connected.When reset button RESET is pressed; normal open switch K2 is closed, and the place of working of leakage current detection protection circuit is connected with the zero-power line WHITE from magnetic test coil L2 (200: 1) for detection of the low resistance fault with passing for detection of the induction coil L1 (1000: 1) of leakage current.
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: normal open switch K1, the K2 in leakage current detection protection circuit shown in Figure 1 and K switch R-2-1, KR-2-2 share a contact; And normal open switch K1, K2 in 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 from 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 from 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: shown in Fig. 2-1 in leakage current detection protection circuit normal open switch K1 and K switch R-3-1 share a contact; Normal open switch K2 and K switch R-3-2 share a contact; And in leakage current detection protection circuit shown in Figure 1, normal open switch K1 and K switch R-2-1 share a contact; Normal open switch K2 and K switch R-2-2 share a contact.
The end of tripping coil L3 is connected 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 surperficial power supply output plughole of supply socket and is connected, simultaneously, the other end of tripping coil L3 also is connected with the power firestreak HOT from magnetic test coil L2 for detection of the low resistance fault with passing for detection of the induction coil L1 (1000: 1) of leakage current by a normal open switch K1.
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 surperficial power supply output plughole of supply socket and is connected; and be not connected with the power firestreak HOT from magnetic test coil L2 for detection of the low resistance fault with passing for detection of the induction coil L1 (1000: 1) of leakage current; 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 is closed, and the normal open switch K1 of tripping coil L3 by closure is connected with passing for detection of the induction coil L1 (1000: 1) of leakage current and conduct electricity sleeve for detection of the live wire output in the power firestreak HOT of magnetic test coil L2 and supply socket surface power supply output plughole of low resistance fault; The anode of controllable silicon V4 is connected with passing for detection of the induction coil L1 (1000: 1) of leakage current with for detection of the live wire output conduction sleeve in the power firestreak HOT of magnetic test coil L2 and supply socket surface power supply output plughole of low resistance fault by tripping coil L3; The working power pin 6 of control chip IC1 by resistance R 1, half-wave arrange diode V1, tripping coil L3 with pass for detection of the induction coil L1 (1000: 1) of leakage current with conduct electricity sleeve for detection of the live wire output in the power firestreak HOT of magnetic test coil L2 and supply socket surface power supply output plughole of low resistance fault and be connected, the charged work of leakage current detection protection circuit.
When reset button RESET was in reset mode, simulation leakage current generating K switch R-1, normal open switch K1 disconnect, and be closed with K switch R-2-1, the KR-3-1 of reset button RESET interlock.Tripping coil L3 is connected with the live wire that the live wire in the surperficial power supply output plughole of supply socket is exported conduction sleeve/power output end LOAD; The anode of controllable silicon V4 is connected with the live wire that the live wire in the surperficial power supply output plughole of supply socket is exported conduction sleeve/power output end LOAD by tripping coil L3; The working power pin 6 of control chip IC1 arranges diode V1, tripping coil L3 by resistance R 1, half-wave and is connected with the live wire that the live wire in the surperficial power supply output plughole of supply socket is exported conduction sleeve/power output end LOAD, the charged work of leakage current detection protection circuit.
Fig. 2-2 are 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 from 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 are 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 from the control signal that 5 pin of control chip IC1 are exported anti-interference capacitor C 5 filtering that being attempted by between controllable silicon trigger electrode and ground, suppress the generation of false triggering.
The present invention is connected with power supply output indicator V3 (LED1) and the V6 (LED2) whether power supply output is arranged for the expression supply socket between the live wire of leakage current detection protection circuit power output end and zero line.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 the destruction that supply socket caused due to thunderbolt or the instantaneous pressure that causes of other reasons; as shown in the figure; leakage current detection protection circuit disclosed by the invention is connected with one group at the live wire HOT of power output end LOAD and zero line WHITE place and is used for the right-angled triangle of discharge or the lightning-arrest sheet metal M3 in tip and the M4 of isosceles triangle shape; 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 one group and is used for the right-angled triangle of discharge or the lightning-arrest sheet metal M1 in tip and the M2 of isosceles 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 cause instantaneous pressure due to thunderbolt or other reasons; 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 is connected with supply socket.
In sum, because the present invention adopts above technical scheme, therefore that leakage current detection protection circuit disclosed by the invention has advantages of is following outstanding:
(1) after the power line in supply socket power input and wall connects, can automatically produce the detection electric current, whether still have the i.e. end-of-life whether of creepage protection function for detection of leakage current detection protection circuit/supply socket.
(2) only press after reset button RESET or reset button reset, just charged work of leakage current detection protection circuit, thus extend 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 is connected 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, within all belonging to 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), 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) is connected 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 surperficial power supply output plughole of supply socket and is connected, simultaneously, the other end of tripping coil (L3) also by a described normal open switch K1 with pass described induction coil (L1) and be connected 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 surperficial power supply output plughole of supply socket and is connected; Simultaneously, the place of working of leakage current detection protection circuit also by described normal open switch K2 with pass described induction coil (L1) and be connected 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 are in off-state, live wire output conduction sleeve in the power supply output plughole of tripping coil (L3) and supply socket surface is connected, 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 surperficial power supply output plughole of supply socket and is connected; 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 are closed, the normal open switch K1 of tripping coil (L3) by closure with pass described induction coil (L1) and the live wire output in the power firestreak (HOT) of magnetic test coil (L2) and supply socket surface power supply output plughole and conduct electricity sleeve and be connected; The place of working 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 is connected; 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 disconnect, switch (KR-2-1 with reset button (RESET) interlock, KR-3-1) closure, tripping coil (L3) is connected with the live wire that the live wire in the surperficial power supply output plughole of supply socket is exported conduction sleeve and power output end (LOAD), the place of working of leakage current detection protection circuit is connected with the zero line that the zero line in the surperficial power supply output plughole of supply socket is exported conduction sleeve and power output end (LOAD), the charged work of leakage current detection protection circuit.
2. leakage current detection protection circuit according to claim 1 is characterized in that: the anode of described controllable silicon (V4) is connected by the live wire output conduction sleeve in described tripping coil (L3) and supply socket surface power supply output plughole; Simultaneously, the anode of described controllable silicon (V4) is by described tripping coil (L3), described normal open switch K1 and pass induction coil (L1) and be connected with power firestreak (HOT) from magnetic test coil (L2);
When being in trip status, described normal open switch K1 is in off-state when reset button (RESET), and the anode of described controllable silicon (V4) is connected by the live wire output conduction sleeve in the surperficial power supply output plughole of described tripping coil (L3) and supply socket;
When reset button (RESET) when being pressed, described normal open switch K1 is closed, and the anode of described controllable silicon (V4) is by described tripping coil (L3), closed described normal open switch K1 and pass described induction coil (L1) and live wire in the power firestreak (HOT) of magnetic test coil (L2) and supply socket surface power supply output plughole is exported and conducted electricity sleeve and be connected;
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 disconnect, with switch (KR-2-1, the KR-3-1) closure of reset button (RESET) interlock, the anode of described controllable silicon (V4) is connected by the live wire output conduction sleeve in the surperficial power supply output plughole of described tripping coil (L3) and supply socket and the live wire of power output end (LOAD).
3. leakage current detection protection circuit according to claim 2 is characterized in that: the working power pin (6) of described control chip (IC1) is connected with live wire output conduction sleeve in the power supply output plughole of supply socket surface by resistance (R1), halfwave rectifier diode (V1), tripping coil (L3); Simultaneously, the working power pin (6) of described control chip (IC1) is by resistance (R1), halfwave rectifier diode (V1), tripping coil (L3), described normal open switch K1 and pass induction coil (L1) and be connected with power firestreak (HOT) from magnetic test coil (L2);
When reset button (RESET) when being in trip status, described normal open switch K1, normal open switch K2 are in off-state, and the working power pin (6) of described control chip (IC1) is exported the conduction sleeve by resistance (R1), halfwave rectifier diode (V1), tripping coil (L3) with the live wire in the surperficial power supply output plughole of supply socket and is connected;
When reset button (RESET) when being pressed, described normal open switch K1 is closed, and the working power pin (6) of described control chip (IC1) is by resistance (R1), halfwave rectifier diode (V1), tripping coil (L3), closed described normal open switch K1 and pass described induction coil (L1) and live wire in the power firestreak (HOT) of magnetic test coil (L2) and supply socket surface power supply output plughole is exported and conducted electricity sleeve and be connected;
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, normal open switch K2 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) is connected with the live wire that the live wire in the surperficial power supply output plughole of supply socket is exported conduction sleeve and power output end (LOAD) by resistance (R1), halfwave rectifier diode (V1), tripping coil (L3).
4. according to claim 1 and 2 or 3 described leakage current detection protection circuits is characterized in that: this leakage current detection protection circuit comprises that one produces simulation leakage current circuit automatically;
Should automatically produce simulation leakage current circuit is made of the 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) is connected with the zero line/live wire of power input through described current-limiting resistance (R4), the other end with pass induction coil (L1) for detection of leakage current, be connected for detection of the power firestreak/zero line from magnetic test coil (L2) of low resistance fault;
Described simulation leakage current generating switch (KR-1) is normally closed switch; Because described normal open switch K2 is closed, after the power input of leakage current detection protection circuit and the power line in 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 induction coil (L1) for detection of leakage current, be connected for detection of the power firestreak/zero line from magnetic test coil (L2) of low resistance fault, 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 action of the mechanical device in 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 for the lightning-arrest sheet metal M3 in the tip of the right-angled triangle of discharge or isosceles triangle shape and M4;
The lightning-arrest sheet metal M3 in described tip is connected with zero line with the live wire of leakage current detection protection circuit power output end respectively with M4; the lightning-arrest sheet metal M3 in described tip and M4 are staggered relatively, and the distance between two lightning-arrest sheet metal lower inside in tip is greater than the distance between its upper inner.
6. leakage current detection protection circuit according to claim 5 is characterized in that: this leakage current detection protection circuit also includes one group and is used for the right-angled triangle of discharge or the lightning-arrest sheet metal M1 in tip and the M2 of isosceles triangle shape;
The lightning-arrest sheet metal M1 in described tip and M2 respectively with supply socket surface power supply output plughole in live wire output conduction sleeve be connected with zero line output conduction sleeve;
The lightning-arrest sheet metal M1 in described tip and M2 are staggered relatively, and the distance between two lightning-arrest sheet metal lower inside in tip is greater than the distance between its upper inner.
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 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910147786 CN101931208B (en) | 2009-06-19 | 2009-06-19 | Leakage current detection protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN101931208A CN101931208A (en) | 2010-12-29 |
| CN101931208B true CN101931208B (en) | 2013-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200910147786 Expired - Fee Related CN101931208B (en) | 2009-06-19 | 2009-06-19 | Leakage current detection protection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
Citations (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 |
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2009
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Patent Citations (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 |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2008-204714A 2008.09.04 |
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| CN101931208A (en) | 2010-12-29 |
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