CN201515205U - Earth leakage checking protective circuit - Google Patents
Earth leakage checking protective circuit Download PDFInfo
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- CN201515205U CN201515205U CN2009201567409U CN200920156740U CN201515205U CN 201515205 U CN201515205 U CN 201515205U CN 2009201567409 U CN2009201567409 U CN 2009201567409U CN 200920156740 U CN200920156740 U CN 200920156740U CN 201515205 U CN201515205 U CN 201515205U
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Abstract
The utility model discloses an earth leakage checking protective circuit which comprises an induction coil for checking leaked current, a self-checking coil for checking low resistance failures, a control chip, a tripping coil provided with an iron core inside, thyristors and a rectifier diode, and is characterized in that one end of the tripping coil provided with the iron core inside is connected with a power supply live wire which passes through the induction coil for checking leaked current and the self-checking coil for checking low resistance failures, and the other end is connected with a power supply zero line which passes through the induction coil for checking leaked current and the self-checking coil for checking low resistance failures through the thyristors.
Description
Technical field
The utility model relates to a kind of leakage current detection protection circuit, and this leakage current detection protection circuit is installed in the supply socket/attaching plug with creepage protection function.Specifically, the leakage current detection protection circuit that the utility model relates to not only has detection of electrical leakage, defencive function, and, after the power line in this leakage current detection protection circuit power input and the wall connects, automatic/hand produces the simulation leakage current, carries out self check; When leakage current detection protection circuit did not have end-of-life, the mechanical device action in supply socket/attaching plug waited for that reset button resets, and pushes reset button RESET, and reset button RESET resets; Otherwise, if the leakage current detection protection circuit end-of-life or wiring error, this leakage current detection protection circuit will stop reset button RESET to reset.
Background technology
Along with the supply socket with creepage protection function (is called for short earth leakage protective socket; GFCI) and the continuous development of attaching plug industry, people are more and more higher to function, safety in utilization, the reliability requirement of supply socket/attaching plug with creepage protection function.This makes the insider constantly be devoted to study, improves the leakage current detection protection circuit that is installed in supply socket/plug, make its uses safer, work more reliable, strength with better function, circuit is more succinct.
Summary of the invention
In view of the foregoing, main purpose of the present utility model provides a kind of leakage current detection protection circuit that is installed in supply socket/attaching plug.After the power line in this leakage current detection protection circuit power input and the wall connected, automatic/hand produced the simulation leakage current, carries out self check; When leakage current detection protection circuit did not have end-of-life, the mechanical device action in supply socket/attaching plug waited for that reset button resets; Push reset button RESET, reset button RESET resets; Otherwise, when this leakage current detection protection circuit end-of-life or wiring error, this leakage current detection protection circuit will stop reset button RESET to reset.
For achieving the above object; the utility model is by the following technical solutions: a kind of leakage current detection protection circuit; it comprises the induction coil that is used to detect leakage current, be used to detect the low resistance fault from magnetic test coil, control chip, the tripping coil that is built-in with iron core, controllable silicon, rectification circuit, it is characterized in that:
One end of the described tripping coil that is built-in with iron core with pass the induction coil that is used to detect leakage current and link to each other with the power firestreak that is used to detect the low resistance fault from magnetic test coil, the other end by described controllable silicon with pass the induction coil that is used to detect leakage current and link to each other with the zero-power line that is used to detect the low resistance fault from magnetic test coil.
In the utility model specific embodiment, one end of the described tripping coil that is built-in with iron core can also with pass the induction coil that is used to detect leakage current and link to each other with the power firestreak that is used to detect the low resistance fault from magnetic test coil, the other end is by described controllable silicon, rectification circuit and pass the induction coil that is used to detect leakage current and link to each other with the zero-power line from magnetic test coil that is used to detect the low resistance fault.
Description of drawings
Fig. 1 is the utility model leakage current detection protection circuit embodiment 1 physical circuit figure;
Fig. 1-1 is the utility model leakage current detection protection circuit embodiment 2 physical circuit figure;
Fig. 2 is the utility model leakage current detection protection circuit embodiment 3 physical circuit figure;
Fig. 3 is the utility model leakage current detection protection circuit embodiment 4 physical circuit figure;
Fig. 3-1 is the utility model leakage current detection protection circuit embodiment 5 physical circuit figure;
Fig. 4 is the utility model leakage current detection protection circuit embodiment 6 physical circuit figure;
Fig. 5 is the utility model leakage current detection protection circuit embodiment 7 physical circuit figure;
Fig. 6 is the utility model leakage current detection protection circuit embodiment 8 physical circuit figure.
Embodiment
The disclosed leakage current detection protection circuit of the utility model 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 connected, automatic/hand produced the simulation leakage current, carries out self check.When this leakage current detection protection circuit did not have end-of-life, the mechanical device action in supply socket/attaching plug waited for that reset button resets; Push reset button RESET, reset button RESET resets.Otherwise, if the leakage current detection protection circuit end-of-life or wiring error, this leakage current detection protection circuit will stop reset button RESET to reset.
Fig. 1 is installed in the leakage current detection protection circuit physical circuit figure in supply socket/attaching plug for the utility model is disclosed.As shown in Figure 1, this leakage current detection protection circuit comprise the induction coil L1 (1000: 1) that is used to detect leakage current, be used to detect the low resistance fault from 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, two simulation leakage current generating K switch R-5, KR-6, diode rectifier bridge V1～V3, V6, power supply output indicator V5.
The live wire L of leakage current detection protection circuit power input LINE, zero line N pass the induction coil L1 (1000: 1) that is used to detect leakage current, be used to detect the low resistance fault behind magnetic test coil L2 (200: 1), link to each other with live wire L, the zero line N of supply socket/plug-in power pack output (load end) LOAD by mains switch KR-2-1, KR-2-2 with supply socket/plug reset button RESET interlock; Simultaneously; the live wire L of leakage current detection protection circuit power input LINE, zero line N 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), K switch R-3-1, the KR-3-2 by another group and reset button RESET interlock links to each other with live wire, zero line output conduction sleeve in the single-phase three-wire power supply output plughole on supply socket surface.
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 1,3,7 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 power supply input pin 6 of control chip IC1 links to each other with the dc power anode of diode rectifier bridge V1～V3, V6 output; The power supply ground pin 4 of control chip IC1 links to each other with the dc power cathode of diode rectifier bridge V1～V3, V6 output.Ac power input end of diode rectifier bridge V1～V3, V6 with pass induction coil L1 (1000: 1) and link to each other with power firestreak L from magnetic test coil L2 (200: 1), another ac power input end of diode rectifier bridge V1～V3, V6 with pass induction coil L1 (1000: 1) and link to each other with zero-power line N from magnetic test coil L2 (200: 1).
Be built-in with iron core tripping coil L3 (SOL) an end with pass induction coil L1 (1000: 1) and link to each other, the normally closed switch K2 of the other end by parallel connection and a normal open switch K3, controllable silicon V4, diode rectifier bridge V1～V3, V6 and pass induction coil L1 (1000: 1) and link to each other with zero-power line N from magnetic test coil L2 (200: 1) with power firestreak L from magnetic test coil L2 (200: 1).The normally closed switch K2 of described parallel connection and normal open switch K3 are built in the iron core effect in the tripping coil L3, have electric current to flow through in tripping coil L3, produce magnetic field, its built-in iron core action, the reset button success that resets, K2 opens with normally closed switch, with normal open switch K3 closure.
The notable feature of the disclosed leakage current detection protection circuit of the utility model is: after the power line in this leakage current detection protection circuit power input and the wall connects, push testing button TEST, manually produce the simulation leakage current, carry out self check.When this leakage current detection protection circuit did not have end-of-life and wiring correct, the mechanical device action in supply socket/attaching plug made the snap close slip sheet mechanism action in supply socket/attaching plug, and snap close is opened, and waits for that reset button resets; Discharge testing button TEST, the simulation leakage current disappears, and pushes reset button RESET, and reset button RESET resets.Otherwise, if the leakage current detection protection circuit end-of-life, this leakage current detection protection circuit will stop reset button RESET to reset.
As shown in Figure 1, the present invention's design has two simulation leakage current generating K switch R-5 and KR-6.Wherein, the end of simulation leakage current generating K switch R-5 links to each other with the zero line of power input LINE by current-limiting resistance R1, and the other end links to each other with the live wire L of power output end (load end) LOAD.When supply socket/attaching plug power output end LOAD has power supply output, push testing button TEST, make simulation leakage current generating K switch R-5 closure, the live wire L of power output end links to each other with the zero line N of power input LINE through K switch R-5, the current-limiting resistance R1 of closure, form the closed-loop path, manually produce the simulation leakage current, the power supply output of the socket/attaching plug of cutting off the electricity supply.
As shown in Figure 1, leakage current detection protection circuit of the present invention also includes a simulation leakage current generating K switch R-6.End of this simulation leakage current generating K switch R-6 links to each other with the zero line N of power input LINE by current-limiting resistance R1, the other end with pass induction coil L1 (1000: 1) and link to each other with power firestreak L from magnetic test coil L2 (200: 1).After the power line in this leakage current detection protection circuit power input and the wall connects; push testing button TEST earlier; make simulation leakage current generating K switch R-6 closure; passing induction coil L1 (1000: 1) links to each other with the zero line N of power input through K switch R-6, the current-limiting resistance R1 of closure with power firestreak L from magnetic test coil L2 (200: 1); form the closed-loop path; manually produce the simulation leakage current, carry out self check.
When this leakage current detection protection circuit does not have end-of-life; what be used to detect the induction coil L1 of leakage current and be used to detect the low resistance fault detects this leakage current from magnetic test coil L2; output signal to control chip IC1; the 5 pin output control signal of control chip IC1; trigger controllable silicon V4; controllable silicon V4 conducting; there is electric current to flow through in the tripping coil L3; produce magnetic field; the iron core action that tripping coil L3 is built-in makes the mechanical device action in supply socket/plug, promotes the action of snap close slip sheet mechanism; snap close is opened, and waits for that reset button resets.Discharge testing button TEST, K switch R-6 disconnects, and the simulation leakage current disappears.At this moment, push reset button RESET, reset button RESET resets.
Otherwise, if the leakage current detection protection circuit end-of-life or wiring error, then not conducting of controllable silicon V4, no current flows through in the tripping coil L3, does not produce magnetic field in the tripping coil L3, and mechanical device is failure to actuate in supply socket/plug, the snap close slip sheet mechanism also is failure to actuate, and snap close can't be opened; Push reset button RESET, because the snap close in the snap close slip sheet mechanism is not opened, the reset guide post below the reset button can't pass the snap close slip sheet mechanism, and reset button RESET can't reset all the time.
Pass induction coil L1 (1000: 1) and between the power firestreak L of magnetic test coil L2 (200: 1) and zero line N, be parallel with the piezo-resistance MOV of an overvoltage protection effect.
Fig. 1-1 is the utility model leakage current detection protection circuit embodiment 2 physical circuit figure.Leakage current detection protection circuit shown in Fig. 1-1 is identical with leakage current detection protection circuit operation principle shown in Figure 1: after the power line in this leakage current detection protection circuit power input and the wall connects, push testing button TEST earlier, make simulation leakage current generating K switch R-6 closure, manually produce the simulation leakage current, carry out self check; When this leakage current detection protection circuit did not have end-of-life, the mechanical device action in supply socket/attaching plug made the snap close slip sheet mechanism action in supply socket/attaching plug, and snap close is opened, and waits for that reset button resets; Discharge testing button TEST, the simulation leakage current disappears, and pushes reset button RESET, and reset button RESET resets.Otherwise, if the leakage current detection protection circuit end-of-life or wiring error, this leakage current detection protection circuit will stop reset button RESET to reset.
Leakage current detection protection circuit shown in Fig. 1-1 and leakage current detection protection circuit circuit shown in Figure 1 are basic identical; its difference is: the end of piezo-resistance MOV with pass induction coil L1 (1000: 1) and link to each other with zero-power line N from magnetic test coil L2 (200: 1), the other end through tripping coil L3 with pass induction coil L1 (1000: 1) and link to each other with power firestreak L from magnetic test coil L2 (200: 1).
Fig. 2 is the utility model leakage current detection protection circuit embodiment 3 physical circuit figure.As shown in the figure, 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, two simulation leakage current generating K switch R-5, KR-6, diode rectifier bridge V1～V3, V6, power supply output indicator V5.
The operation principle of leakage current detection protection circuit shown in Figure 2 is: after the power line in this leakage current detection protection circuit power input and the wall connects, produce the simulation leakage current automatically, carry out self check; When this leakage current detection protection circuit does not have end-of-life and wiring correct, the tripping coil L3 of built-in iron core has electric current to flow through, produce magnetic field in the tripping coil L3, promote the action of snap close slip sheet mechanism, snap close is opened, and waits for that reset button resets, simultaneously, mechanical device action in supply socket/attaching plug will be simulated leakage current generating K switch R-6, K switch 2 disconnections, and the simulation leakage current disappears; Push reset button RESET, reset button RESET resets; Otherwise, if the leakage current detection protection circuit end-of-life can not produce leakage current, K switch R-6, K2 can automatic disconnections, this leakage current detection protection circuit will stop reset button RESET to reset.
As shown in Figure 2, this leakage current detection protection circuit comprises two simulation leakage current generating K switch R-5, KR-6.Wherein, simulation leakage current generating K switch R-6 is a normally closed switch, the one end by normally closed switch K2 with pass the induction coil L1 that is used to detect leakage current and link to each other with the power firestreak L that is used to detect the low resistance fault from magnetic test coil L2, the other end of simulation leakage current generating K switch R-6 links to each other with the zero line N of power input LINE by current-limiting resistance R1.Described normally closed switch K2, simulation leakage current generating K switch R-6 are controlled by the mechanical device in supply socket/plug.
After the power line in this leakage current detection protection circuit power input and the wall connects; because simulation leakage current generating K switch R-6 and K switch 2 all are closed; passing the induction coil L1 that is used to detect leakage current links to each other with the zero line of power input through K switch 2, KR-6, resistance R 1 with the power firestreak L from magnetic test coil L2 that is used to detect the low resistance fault; form the closed-loop path; automatically produce the simulation leakage current, carry out self check.
When this leakage current detection protection circuit does not have end-of-life and wiring correct, what be used to detect the induction coil L1 of leakage current and be used to detect the low resistance fault detects this leakage current from magnetic test coil L2, output signal to control chip IC1, the 5 pin output control signal of control chip IC1 triggers controllable silicon V4, controllable silicon V4 conducting, there is electric current to flow through in the tripping coil L3, produces magnetic field, promote the snap close slip sheet mechanism action in supply socket/plug, snap close is opened, and waits for that reset button resets; Be disconnected by the effect normally closed switch K2 of the built-in iron core of tripping coil L3 this moment, and simulation leakage current generating K switch R-6 is disconnected, and the simulation leakage current disappears.
Push reset button RESET, reset button RESET just can reset.
Otherwise, if the leakage current detection protection circuit end-of-life or wiring error, then not conducting of controllable silicon V4, no current flows through in the tripping coil L3, does not produce magnetic field in the tripping coil L3, the snap close slip sheet mechanism in supply socket/plug is failure to actuate all the time; Push reset button RESET, because the not action of snap close slip sheet mechanism, the reset guide post below the reset button can't pass the snap close slip sheet mechanism, and reset button RESET can't reset all the time.
Design has two Closing Switch K2 and KR-6 in the circuit of automatic generation simulation leakage current shown in Figure 2; after leakage current detection protection circuit powers on automatic generation simulation leakage current; mechanical device action in supply socket/plug disconnects K switch R-2, KR-6 immediately, and the simulation leakage current is disappeared.The purpose of this design is: guarantee to have at least a switch to disconnect, the simulation leakage current disappears.
As shown in Figure 2, an end that is built-in with the tripping coil L3 (SOL) of iron core links to each other with the power firestreak L of power input LINE, the other end links to each other with the anode of controllable silicon V4 by K switch 3, and the negative electrode of controllable silicon V4 links to each other with the dc power cathode of diode rectifier bridge.Described K switch 3 comprises a pair of normally-closed contact and a pair of normally opened contact.Have electric current to flow through in tripping coil L3, produce magnetic field, during its built-in iron core action, the normally-closed contact of K switch 3 disconnects, the normally opened contact closure.
As shown in Figure 2, the end of piezo-resistance MOV links to each other with the zero line N of power input LINE, and the other end links to each other with the live wire L of power input through tripping coil L3.
Fig. 3 is the utility model leakage current detection protection circuit embodiment 4 physical circuit figure.The operation principle of leakage current detection protection circuit shown in Figure 3 is: after the power line in this leakage current detection protection circuit power input and the wall connects, push testing button TEST earlier, make simulation leakage current generating K switch R-6 closure, manually produce the simulation leakage current, carry out self check; When this leakage current detection protection circuit does not have end-of-life, the tripping coil L3 of built-in iron core has electric current to flow through, produce magnetic field in the tripping coil L3, be built in the iron core action in the tripping coil L3, promote the action of snap close slip sheet mechanism, snap close is opened, and K switch 2 disconnects simultaneously, waits for that reset button resets; Discharge testing button TEST, simulation leakage current generating K switch R-6 is disconnected, the simulation leakage current disappears; Push reset button RESET again, reset button RESET resets; Otherwise, if the leakage current detection protection circuit end-of-life, this leakage current detection protection circuit will stop reset button RESET to reset.
As shown in Figure 3, this leakage current detection protection circuit comprises two simulation leakage current generating K switch R-5, KR-6.Wherein, simulation leakage current generating K switch R-6 is a normal open switch, the normally closed switch K2 of one end by being subjected to the built-in iron core effect of tripping coil L3 with pass the induction coil L1 that is used to detect leakage current and link to each other with the power firestreak L that is used to detect the low resistance fault from magnetic test coil L2, the other end of simulation leakage current generating K switch R-6 links to each other with the zero line N of power input LINE by current-limiting resistance R1.
After the power line in this leakage current detection protection circuit power input and the wall connects; push testing button TEST earlier; make simulation leakage current generating K switch R-6 closure; passing the induction coil L1 that is used to detect leakage current links to each other with the zero line of power input through K switch 2, KR-6, the resistance R 1 of closure with the power firestreak L from magnetic test coil L2 that is used to detect the low resistance fault; form the closed-loop path; manually produce the simulation leakage current, carry out self check.
When this leakage current detection protection circuit does not have end-of-life, what be used to detect the induction coil L1 of leakage current and be used to detect the low resistance fault detects this leakage current from magnetic test coil L2, output signal to control chip IC1, the 5 pin output control signal of control chip IC1 triggers controllable silicon V4, controllable silicon V4 conducting, there is electric current to flow through in the tripping coil L3, produces magnetic field, promote the snap close slip sheet mechanism action in supply socket/plug, snap close is opened, and waits for that reset button resets; At this moment, because controllable silicon V4 conducting has electric current to flow through in the tripping coil L3, produce magnetic field, be built in the iron core action in the tripping coil L3, normally closed switch K2 disconnected, simultaneously, discharge testing button TEST, simulation leakage current generating K switch R-6 also disconnects, and the simulation leakage current disappears.
Push reset button RESET, reset button RESET just can reset.
Otherwise, if the leakage current detection protection circuit end-of-life, then not conducting of controllable silicon V4, no current flows through in the tripping coil L3, does not produce magnetic field in the tripping coil L3, and the snap close slip sheet mechanism in supply socket/plug is failure to actuate all the time; Push reset button RESET, because the not action of snap close slip sheet mechanism, the reset guide post below the reset button can't pass the snap close slip sheet mechanism, and reset button RESET can't reset all the time.
As shown in Figure 3, an end that is built-in with the tripping coil L3 (SOL) of iron core links to each other with the power firestreak L of power input LINE, and the other end links to each other through the anode of K switch 3 with controllable silicon V4, and the negative electrode of controllable silicon V4 links to each other with the zero line N of power input.
As shown in Figure 3, the end of piezo-resistance MOV links to each other with the zero line N of power input LINE, and the other end links to each other with the live wire L of power input through tripping coil L3.
As shown in Figure 3, the working power pin 6 of control chip IC1 links to each other with the live wire L of power input LINE by halfwave rectifier diode V1, resistance R 3, tripping coil L3.
Fig. 3-1 is the utility model leakage current detection protection circuit embodiment 5 physical circuit figure.The operation principle of the leakage current detection protection circuit shown in Fig. 3-1 is: after the power line in this leakage current detection protection circuit power input and the wall connects, produce the simulation leakage current automatically, carry out self check; When this leakage current detection protection circuit did not have end-of-life, the tripping coil L3 of built-in iron core had electric current to flow through, and produced magnetic field in the tripping coil L3, promoted the action of snap close slip sheet mechanism, and snap close is opened, and waited for that reset button resets; When leakage current detection protection circuit power on automatically produce the simulation leakage current after, the mechanical device action in supply socket/plug disconnects the K switch in the leakage current generating loop 2, simulation leakage current generating K switch R-6, and the simulation leakage current is disappeared; Push reset button RESET, reset button RESET resets; Otherwise, if the leakage current detection protection circuit end-of-life, this leakage current detection protection circuit will stop reset button RESET to reset.
Shown in Fig. 3-1, this leakage current detection protection circuit comprises two simulation leakage current generating K switch R-5, KR-6.Wherein, simulation leakage current generating K switch R-6 is a normally closed switch, the one end by normally closed switch K2 with pass the induction coil L1 that is used to detect leakage current and link to each other with the power firestreak L that is used to detect the low resistance fault from magnetic test coil L2, the other end of simulation leakage current generating K switch R-6 links to each other with the zero line N of power input LINE by current-limiting resistance R1.Described normally closed switch K2, simulation leakage current generating K switch R-6 are controlled by the mechanical device in supply socket/plug.
After the power line in this leakage current detection protection circuit power input and the wall connects; because simulation leakage current generating K switch R-6 and K switch 2 all are closed; passing the induction coil L1 that is used to detect leakage current links to each other with the zero line of power input through K switch 2, KR-6, the resistance R 1 of closure with the power firestreak L from magnetic test coil L2 that is used to detect the low resistance fault; form the closed-loop path; automatically produce the simulation leakage current, carry out self check.
When this leakage current detection protection circuit does not have end-of-life, what be used to detect the induction coil L1 of leakage current and be used to detect the low resistance fault detects this leakage current from magnetic test coil L2, output signal to control chip IC1, the 5 pin output control signal of control chip IC1 triggers controllable silicon V4, controllable silicon V4 conducting, there is electric current to flow through in the tripping coil L3, produces magnetic field, promote the snap close slip sheet mechanism action in supply socket/plug, snap close is opened, and waits for that reset button resets; After leakage current detection protection circuit powered on generation simulation leakage current, the mechanical device action in supply socket/plug disconnected K switch 2, KR-6 immediately, simulates leakage current and disappears.
Push reset button RESET, reset button RESET just can reset.
Otherwise, if the leakage current detection protection circuit end-of-life or wiring error, then not conducting of controllable silicon V4, no current flows through in the tripping coil L3, does not produce magnetic field in the tripping coil L3, the snap close slip sheet mechanism in supply socket/plug is failure to actuate all the time; Push reset button RESET, because the not action of snap close slip sheet mechanism, the reset guide post below the reset button can't pass the snap close slip sheet mechanism, and reset button RESET can't reset all the time.
Shown in Fig. 3-1, be built-in with iron core tripping coil L3 (SOL) an end with pass the induction coil L1 that is used to detect leakage current and link to each other with the power firestreak L that is used to detect the low resistance fault from magnetic test coil L2, the other end is through K switch 3, controllable silicon V4 and pass the induction coil L1 that is used to detect leakage current and link to each other with the zero-power line N from magnetic test coil L2 that is used to detect the low resistance fault.Described K switch 3 comprises a pair of normally-closed contact and a pair of normally opened contact.Have electric current to flow through in tripping coil L3, produce magnetic field, when its built-in iron core action reset button resetted success, the normally-closed contact of K switch 3 disconnected, the normally opened contact closure.
Shown in Fig. 3-1, the end of piezo-resistance MOV with pass the induction coil L1 that is used to detect leakage current and link to each other with the zero-power line N that is used to detect the low resistance fault from magnetic test coil L2, the other end through tripping coil L3 with pass the induction coil L1 that is used to detect leakage current and link to each other with the power firestreak L that is used to detect the low resistance fault from magnetic test coil L2.
Shown in Fig. 3-1, the working power pin 6 of control chip IC1 is by halfwave rectifier diode V1, resistance R 3, tripping coil L3 and pass the induction coil L1 that is used to detect leakage current and link to each other with the power firestreak L from magnetic test coil L2 that is used to detect the low resistance fault.
Fig. 4 is the utility model leakage current detection protection circuit embodiment 6 physical circuit figure.Leakage current detection protection circuit shown in Figure 4 is identical with leakage current detection protection circuit operation principle shown in Figure 3, and circuit is basic identical, and its difference is: the position difference that is used to represent the indicator light V5 of leakage current detection protection circuit operating state.
Fig. 5 is the utility model leakage current detection protection circuit embodiment 7 physical circuit figure.The operation principle of leakage current detection protection circuit shown in Figure 5 is: after the power line in this leakage current detection protection circuit power input and the wall connects, produce the simulation leakage current automatically, carry out self check; Push reset button, when this leakage current detection protection circuit does not have end-of-life, the tripping coil L3 of built-in iron core has electric current to flow through, produce magnetic field in the tripping coil L3, promote the action of snap close slip sheet mechanism, snap close is opened, the wait reset button resets, simultaneously, the mechanical device action in supply socket/plug disappears the simulation leakage current; Discharge reset button RESET, reset button RESET resets; Otherwise, if the leakage current detection protection circuit end-of-life, this leakage current detection protection circuit will stop reset button RESET to reset.
As shown in Figure 5, this leakage current detection protection circuit comprises two simulation leakage current generating K switch R-5, KR-6.Wherein, simulation leakage current generating K switch R-6 is a normally closed switch, the one end by tripping coil L3 with pass the induction coil L1 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, the other end of simulation leakage current generating K switch R-6 links to each other with the zero line WHITE of power input LINE by current-limiting resistance R4.Described simulation leakage current generating K switch R-6 is controlled by the mechanical device in supply socket/plug.
The end of the tripping coil L3 (SOL) that is built-in with iron core in the leakage current detection protection circuit shown in Figure 5 with pass the induction coil L1 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, the other end by K switch R-4, controllable silicon V4 with pass the induction coil L1 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.
After the power line in this leakage current detection protection circuit power input and the wall connects; because simulation leakage current generating K switch R-6 is closed; passing the induction coil L1 that is used to detect leakage current links to each other with the zero line of power input through tripping coil L3, closed K switch R-6, resistance R 4 with the power firestreak HOT from magnetic test coil L2 that is used to detect the low resistance fault; form the closed-loop path; automatically produce the simulation leakage current, carry out self check.
When this leakage current detection protection circuit does not have end-of-life, what be used to detect the induction coil L1 of leakage current and be used to detect the low resistance fault detects this leakage current from magnetic test coil L2, output signal to control chip IC1, the 5 pin output control signal of control chip IC1 triggers controllable silicon V4; Push reset button RESET, make K switch R-4 closure, controllable silicon V4 conducting has electric current to flow through in the tripping coil L3, produces magnetic field, promotes the snap close slip sheet mechanism action in supply socket/plug, and snap close is opened, and waits for that reset button resets; After leakage current detection protection circuit powered on generation simulation leakage current, simulation leakage current generating K switch R-6 disconnected, the disappearance of simulation leakage current.
Discharge reset button RESET, reset button RESET resets.
Otherwise, if the leakage current detection protection circuit end-of-life, then not conducting of controllable silicon V4, no current flows through in the tripping coil L3, does not produce magnetic field in the tripping coil L3, and the snap close slip sheet mechanism in supply socket/plug is failure to actuate all the time; Push reset button RESET, because the not action of snap close slip sheet mechanism, the reset guide post below the reset button can't pass the snap close slip sheet mechanism, and reset button RESET can't reset all the time.
Fig. 6 is the utility model leakage current detection protection circuit embodiment 8 physical circuit figure.The operation principle of leakage current detection protection circuit shown in Figure 6 is: after the power line in this leakage current detection protection circuit power input and the wall connects, produce the simulation leakage current automatically, carry out self check; When this leakage current detection protection circuit did not have end-of-life, the tripping coil L3 of built-in iron core had electric current to flow through, and produced magnetic field in the tripping coil L3, promoted the action of snap close slip sheet mechanism, and snap close is opened, and waited for that reset button resets; After leakage current detection protection circuit powered on generation simulation leakage current, the mechanical device action in supply socket/plug disconnected the switch of simulating in the leakage current generating loop immediately, and the simulation leakage current is disappeared; Push reset button RESET, reset button RESET resets; Otherwise, if the leakage current detection protection circuit end-of-life, this leakage current detection protection circuit will stop reset button RESET to reset.
As shown in Figure 6, 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 the normally closed switch K2, normally closed simulation leakage current generating K switch R-6 and the current-limiting resistance R4 that connect.The end of simulation leakage current generating K switch R-6 links to each other with the zero line WHITE of power input through current-limiting resistance R4, and the frequent make and break of other end pass K2 links to each other with the power firestreak HOT from magnetic test coil L2 (200: 1) that passes the induction coil L1 (1000: 1) that is used to detect leakage current, be used to detect the low resistance fault.
After the power input of leakage current detection protection circuit and the power line in the wall connect; because simulation leakage current generating K switch 2, KR-6 closure; the zero line of power input is through current-limiting resistance R4, closed simulation leakage current generating K switch 2, KR-6 and pass the induction coil L1 (1000: 1) that is used to detect leakage current, the power firestreak HOT from magnetic test coil L2 (200: 1) that is used to detect the low resistance fault links to each other; form the closed-loop path, produce the simulation leakage current automatically.In the moment that produces the simulation leakage current, if leakage current detection protection circuit does not have end-of-life, the then action of the mechanical device in supply socket/attaching plug disconnects normally closed switch K2, K switch R-6, and the simulation leakage current disappears.In simulation leakage current generating loop, the K switch 2 of two series connection of design, the purpose of KR-6 are: guarantee to have at least a switch to disconnect, the simulation leakage current is disappeared.
In order to protect tripping coil L3; prolong its useful life; as shown in Figure 6, reset switch KR-4, the tripping coil L3 of the anode of controllable silicon V4 by series connection links to each other with the power firestreak HOT from magnetic test coil L2 (200: 1) that passes the induction coil L1 (1000: 1) that is used to detect leakage current, be used to detect the low resistance fault.
Press reset button, reset switch KR-4 closure, the anode of controllable silicon V4 reset switch KR-4, the tripping coil L3 by closure links to each other with the power firestreak HOT from magnetic test coil L2 (200: 1) that passes the induction coil L1 (1000: 1) that is used to detect leakage current, be used to detect the low resistance fault.At this moment, simulation leakage current generating circuit produces the simulation leakage current, the controllable silicon V4 conducting that is triggered, there is electric current to flow through in the tripping coil L3, produces magnetic field, make built-in iron core action wherein, thereby make the mechanical device action in supply socket/plug, wait for that reset button RESET resets; Mechanical device action in supply socket/plug will be simulated leakage current generating K switch 2, KR-6 disconnection, and the simulation leakage current disappears.
Push reset button, discharge reset button, reset button resets, and reset switch KR-4 off-state is converted to closure state.
In order to improve the useful life of supply socket/attaching plug; avoid because the destruction that the instantaneous pressure that thunderbolt or other reasons cause causes supply socket/attaching plug; as Fig. 1～shown in Figure 4; the tip that the disclosed leakage current detection protection circuit of the utility model is connected with a right-angled triangle that is used to discharge or isoceles triangle shape respectively at live wire HOT and the zero line WHITE place of power input LINE take shelter from the thunder sheet metal M1, M2, most advanced and sophisticated lightning-arrest sheet metal M1, M2 quite place.In addition, power firestreak HOT also links to each other with ground wire through tripping coil L3, a piezo-resistance MOV.Can also be as Fig. 5, shown in Figure 6, lightning-arrest sheet metal M1, M2 at the tip of passing induction coil L1 and being connected with a right-angled triangle that is used to discharge or isoceles triangle shape respectively from live wire HOT and the zero line WHITE place of magnetic test coil L2, most advanced and sophisticated lightning-arrest sheet metal M1, M2 quite place.In addition, power firestreak HOT also links to each other with ground wire through tripping coil L3, a piezo-resistance MOV.
When the live wire of power input and zero line because thunderbolt or other reasons when causing instantaneous pressure; the air dielectric that is connected to the lightning-arrest sheet metal in tip at input live wire place and is connected between the lightning-arrest sheet metal in tip at input zero line place is breakdown; form atmospherical discharges; most of high pressure consumes by lightning-arrest sheet metal; the residue sub-fraction consumes by tripping coil L3, piezo-resistance MOV, thereby has protected leakage current detection protection circuit.
In specific embodiment of the utility model, described piezo-resistance MOV selects surge inhibition type piezo-resistance for use, makes it can also play the effect that prevents electrophoresis.
In sum, because the utility model adopts above technical scheme, so the disclosed leakage current detection protection circuit of the utility model has following outstanding advantage:
(1) after the power line in supply socket/plug-in power pack input and the wall connects, but automatic or manual produce to detect electric current, detects supply socket/plug and whether still has the i.e. end-of-life whether of creepage protection function; The wait reset button resets.
(2) be built-in with iron core tripping coil two ends respectively with pass the induction coil L1 (1000: 1) that is used to detect leakage current and link to each other with zero line with the power firestreak that is used to detect the low resistance fault from magnetic test coil L2 (200: 1).
(3) has the defencive function of the destruction that anti-lightning strike and instantaneous pressure that other reasons causes causes earth leakage protective socket.
(4) this supply socket/attaching plug; have reversal connection line function, when leakage protection circuit power input wiring error, this leakage current detection protection circuit can't produce the simulation leakage current; normally closed switch K2, KR-6 can automatic disconnections, and leakage current detection protection circuit stops reset button to reset.
The above is specific embodiment of the utility model and the know-why used, and is any based on the equivalent transformation on the technical solutions of the utility model basis, all belongs within the utility model protection range.
Claims (15)
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 (IC1), the tripping coil (L3) that is built-in with iron core, controllable silicon (V4), rectification circuit, it is characterized in that:
One end of the described tripping coil (L3) that is built-in with iron core with pass induction coil (L1) that is used to detect leakage current and the power firestreak that is used to detect the low resistance fault (L) and link to each other from magnetic test coil (L2), the other end by described controllable silicon (V4) with pass induction coil (L1) that is used to detect leakage current and the zero-power line that is used to detect the low resistance fault (N) and link to each other from magnetic test coil (L2).
2. leakage current detection protection circuit according to claim 1 is characterized in that: the other end of the described tripping coil (L3) that is built-in with iron core is by described controllable silicon (V4), rectification circuit and pass induction coil (L1) that is used to detect leakage current and the zero-power line from magnetic test coil (L2) that is used to detect the low resistance fault (N) and link to each other.
3. leakage current detection protection circuit according to claim 2 is characterized in that: described rectification circuit is the diode full-wave rectifying circuit.
4. according to the described leakage current detection protection circuit of claim 1～3, it is characterized in that: this leakage current detection protection circuit also comprises two simulation leakage current generating switches (KR-5, KR-6);
Wherein, an end of first simulation leakage current generating switch (KR-5) links to each other by the zero line/live wire of current-limiting resistance with power input (LINE), and the other end links to each other with the live wire/zero line of power output end (LOAD); Be used to the to cut off the electricity supply power supply output of socket/attaching plug of the described first simulation leakage current generating switch (KR-5);
One end of second simulation leakage current generating switch (KR-6) links to each other by the zero line/live wire of current-limiting resistance with power input (LINE), the other end with pass the induction coil (L1) that is used to detect leakage current and link to each other with the power firestreak/zero line that is used to detect the low resistance fault from magnetic test coil (L2); Described second simulation leakage current generating switch is used for after the power input of leakage current detection protection circuit connects with the power line in the wall, and leakage current is simulated in the automatic/hand generation.
5. leakage current detection protection circuit according to claim 4 is characterized in that: described second simulation leakage current generating switch (KR-6) is normally closed switch;
After the power line in this leakage current detection protection circuit power input and the wall connects, produce the simulation leakage current automatically, carry out self check; When this leakage current detection protection circuit did not have end-of-life, after waiting to simulate leakage current generating, the mechanical device action in supply socket/plug disconnected described second simulation leakage current generating switch (KR-6), waits for that reset button resets; Push reset button (RESET), reset button resets; When this leakage current detection protection circuit end-of-life, this leakage current detection protection circuit stops reset button to reset.
6. leakage current detection protection circuit according to claim 5 is characterized in that: described second simulation leakage current generating switch (KR-6) is normally closed switch;
One end of described second simulation leakage current generating switch (KR-6) links to each other by the zero line/live wire of current-limiting resistance with power input (LINE), the other end by a normally closed switch (K2) with pass the induction coil (L1) that is used to detect leakage current and link to each other with the power firestreak/zero line that is used to detect the low resistance fault from magnetic test coil (L2);
Described normally closed switch (K2) is controlled by the mechanical device in supply socket/plug, after leakage current detection protection circuit produces the simulation leakage current, and the mechanical device action in supply socket/plug, this normally closed switch (K2) disconnects.
7. leakage current detection protection circuit according to claim 6, it is characterized in that: the power line in this leakage current detection protection circuit power input and wall connects, when leakage current detection protection circuit does not have end-of-life and wiring correct, described second simulation leakage current generating (KR-6) and described normally closed switch (K2) automatic disconnection automatically; Otherwise when leakage current detection protection circuit end-of-life or wiring error, described second automatically simulation leakage current generating (KR-6) and described normally closed switch (K2) can automatic disconnections, and the prevention reset button resets.
8. leakage current detection protection circuit according to claim 4 is characterized in that: described second simulation leakage current generating switch (KR-6) is normal open switch;
After the power line in this leakage current detection protection circuit power input and the wall connects, push testing button earlier, manually produce the simulation leakage current, carry out self check; When this leakage current detection protection circuit did not have end-of-life, the mechanical device action in supply socket/plug waited for that reset button resets, and discharges testing button (TEST), and the simulation leakage current disappears; Push reset button (RESET) again, reset button resets; Otherwise when leakage current detection protection circuit end-of-life or wiring error, this leakage current detection protection circuit stops reset button to reset.
9. leakage current detection protection circuit according to claim 8 is characterized in that: described second simulation leakage current generating switch (KR-6) is normal open switch;
One end of described second simulation leakage current generating switch (KR-6) links to each other by the zero line/live wire of current-limiting resistance with power input (LINE), the other end by a normally closed switch (K2) with pass the induction coil (L1) that is used to detect leakage current and link to each other with the power firestreak/zero line that is used to detect the low resistance fault from magnetic test coil (L2);
Described normally closed switch (K2) is controlled by the mechanical device in supply socket/plug, after leakage current detection protection circuit produces the simulation leakage current, and the mechanical device action in supply socket/plug, this normally closed switch (K2) disconnects, and wait resets.
10. according to the described leakage current detection protection circuit of claim 1～3, it is characterized in that: this leakage current detection protection circuit also comprises two simulation leakage current generating switches (KR-5, KR-6);
Wherein, an end of first simulation leakage current generating switch (KR-5) links to each other by the zero line/live wire of current-limiting resistance with power input (LINE), and the other end links to each other with the live wire/zero line of power output end (LOAD);
One end of second simulation leakage current generating switch (KR-6) links to each other by the zero line/live wire of current-limiting resistance with power input (LINE), the other end by described tripping coil (L3) with pass the induction coil (L1) that is used to detect leakage current and link to each other with the power firestreak/zero line that is used to detect the low resistance fault from magnetic test coil (L2).
11. leakage current detection protection circuit according to claim 10 is characterized in that: described second simulation leakage current generating switch (KR-6) is normally closed switch;
After the power line in this leakage current detection protection circuit power input and the wall connects, produce the simulation leakage current automatically, carry out self check; When this leakage current detection protection circuit did not have end-of-life, after waiting to simulate leakage current generating, the mechanical device action in supply socket/plug disconnected described second simulation leakage current generating switch (KR-6), waits for that reset button resets; Push reset button (RESET), reset button resets; When this leakage current detection protection circuit end-of-life, this leakage current detection protection circuit stops reset button to reset.
12. 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 (IC1), the tripping coil (L3) that is built-in with iron core, controllable silicon (V4), half-wave rectifying circuit, it is characterized in that:
One end of the described tripping coil (L3) that is built-in with iron core with pass induction coil (L1) that is used to detect leakage current and the power firestreak that is used to detect the low resistance fault (L) and link to each other from magnetic test coil (L2), the other end is by reset switch (KR-4), described controllable silicon (V4) and pass induction coil (L1) that is used to detect leakage current and the zero-power line from magnetic test coil (L2) that is used to detect the low resistance fault (N) and link to each other.
13. leakage current detection protection circuit according to claim 12 is characterized in that: this leakage current detection protection circuit also comprises two simulation leakage current generating switches (KR-5, KR-6) that link with supply socket/attaching plug testing button (TEST);
Wherein, an end of first simulation leakage current generating switch (KR-5) links to each other by the zero line/live wire of current-limiting resistance with power input (LINE), and the other end links to each other with the live wire/zero line of power output end (LOAD);
One end of second simulation leakage current generating switch (KR-6) links to each other by the zero line/live wire of current-limiting resistance with power input (LINE), the other end by described tripping coil (L3) with pass the induction coil (L1) that is used to detect leakage current and link to each other with the power firestreak/zero line that is used to detect the low resistance fault from magnetic test coil (L2);
Described second simulation leakage current generating switch (KR-6) is normally closed switch;
After the power line in this leakage current detection protection circuit power input and the wall connects, produce the simulation leakage current automatically, carry out self check; When this leakage current detection protection circuit does not have end-of-life, after waiting to simulate leakage current generating, press reset button, mechanical device in supply socket/plug moves described reset switch (KR-4) closure, the reset button success that resets makes described second simulation leakage current generating switch (KR-6) become disconnection; When this leakage current detection protection circuit end-of-life, this leakage current detection protection circuit stops reset button to reset.
14. 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 (IC1), the tripping coil (L3) that is built-in with iron core, controllable silicon (V4), half-wave rectifying circuit, it is characterized in that:
One end of the described tripping coil (L3) that is built-in with iron core with pass induction coil (L1) that is used to detect leakage current and the power firestreak that is used to detect the low resistance fault (L) and link to each other from magnetic test coil (L2), the other end links to each other with ground by reset switch (KR-4), described controllable silicon (V4).
15. leakage current detection protection circuit according to claim 14 is characterized in that: this leakage current detection protection circuit also comprises two simulation leakage current generating switches (KR-5, KR-6) that link with supply socket/attaching plug testing button (TEST);
Wherein, an end of first simulation leakage current generating switch (KR-5) links to each other by the zero line/live wire of current-limiting resistance with power input (LINE), and the other end links to each other with the live wire/zero line of power output end (LOAD);
Described second simulation leakage current generating switch (KR-6) is normally closed switch;
One end of described second simulation leakage current generating switch (KR-6) links to each other by the zero line/live wire of current-limiting resistance with power input (LINE), the other end by a normally closed switch (K2) with pass the induction coil (L1) that is used to detect leakage current and link to each other with the power firestreak/zero line that is used to detect the low resistance fault from magnetic test coil (L2);
Described second simulation leakage current generating switch (KR-6), normally closed switch (K2) are controlled by the mechanical device in supply socket/plug; after leakage current detection protection circuit produces the simulation leakage current; mechanical device action in supply socket/plug; normally closed switch (K2) and second simulation leakage current generating switch (KR-6) are disconnected, and the simulation leakage current disappears.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201567409U CN201515205U (en) | 2009-06-04 | 2009-06-04 | Earth leakage checking protective circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201567409U CN201515205U (en) | 2009-06-04 | 2009-06-04 | Earth leakage checking protective circuit |
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|---|---|
| CN201515205U true CN201515205U (en) | 2010-06-23 |
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| CN2009201567409U Expired - Fee Related CN201515205U (en) | 2009-06-04 | 2009-06-04 | Earth leakage checking protective circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102315621A (en) * | 2010-07-06 | 2012-01-11 | 益而益(集团)有限公司 | Electric wire connection protecting device with self-checking function |
| CN103887764A (en) * | 2014-03-25 | 2014-06-25 | 温州市万盛电器有限公司 | Electric leakage detection and protection circuit integrating regular self-inspection and reversed wiring protection functions |
| CN106443305A (en) * | 2016-11-09 | 2017-02-22 | 广东盈科电子有限公司 | Electric leakage detection circuit of alternating current and detection method |
| CN109004621A (en) * | 2018-08-08 | 2018-12-14 | 山东超越数控电子股份有限公司 | A kind of low-power consumption leakage protection circuit for AC electric current |
-
2009
- 2009-06-04 CN CN2009201567409U patent/CN201515205U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102315621A (en) * | 2010-07-06 | 2012-01-11 | 益而益(集团)有限公司 | Electric wire connection protecting device with self-checking function |
| CN103887764A (en) * | 2014-03-25 | 2014-06-25 | 温州市万盛电器有限公司 | Electric leakage detection and protection circuit integrating regular self-inspection and reversed wiring protection functions |
| CN106443305A (en) * | 2016-11-09 | 2017-02-22 | 广东盈科电子有限公司 | Electric leakage detection circuit of alternating current and detection method |
| CN109004621A (en) * | 2018-08-08 | 2018-12-14 | 山东超越数控电子股份有限公司 | A kind of low-power consumption leakage protection circuit for AC electric current |
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