CN105305374A - Electric leakage detection protective circuit having precise overload protection function - Google Patents
Electric leakage detection protective circuit having precise overload protection function Download PDFInfo
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- CN105305374A CN105305374A CN201510706221.5A CN201510706221A CN105305374A CN 105305374 A CN105305374 A CN 105305374A CN 201510706221 A CN201510706221 A CN 201510706221A CN 105305374 A CN105305374 A CN 105305374A
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Abstract
The present invention provides an electric leakage detection protective circuit having a precise overload protection function. The electric leakage detection protective circuit comprises an input terminus of a power supply, an output terminal of the power supply, a major loop switch, an electric leakage induction coil, an electric leakage control chip, a thyristor and an electromagnetic trip coil, and also comprises an overload protection circuit. The overload protection circuit includes a sampling resistor, a linear amplification circuit and a voltage comparison circuit, wherein the voltage comparison circuit is configured to compare a voltage signal after amplification of the linear amplification circuit with a preset voltage value and output a high level to drive the conduction of the thyristor so as to allow the electromagnetic trip coil to form a pathway when the voltage signal exceeds the voltage signal. According to the invention, the voltage signal on the sampling resistor after amplification of the linear amplification circuit is compared with a preset voltage value, an overcurrent occurs when the voltage signal on the sampling resistor exceeds the preset voltage value, and a major loop switch is immediately switched off. The electric leakage detection protective circuit having a precise overload protection function has high detection precision, sensitive reaction, simple and reasonable circuit design, small elements and low cost.
Description
Technical field
The present invention relates to earth leakage protective field, be specifically related to a kind of leakage current detection protection circuit with accurate overload protection function.
Background technology
Current leakage protection circuit generally comprises and comprises power input, power output end, major loop switch, electric leakage induction coil, electric leakage control chip, controllable silicon and form the electromagnetic trip coil etc. that disconnects to drive major loop switch trip of path when controlled silicon conducting; when there is leakage current in circuit; leakage current signal is sent to electric leakage control chip by electric leakage induction coil; electric leakage control chip drives controlled silicon conducting and then makes electromagnetic trip coil form path; drive inner-core action at magnetic fields, thus drive major loop switch trip to disconnect.Such circuit only possesses creepage protection function usually; to provide overload protection function, (overload current magnitude is much larger than rated current; and creepage protection function can not meet user to safety utilization of electric power prevent get an electric shock with prevent from transshipping cause the consideration of fire) often through arranging the mechanical switchs such as thrermostatic bimetal-plate, by mechanical organ heating distortion disconnect major loop.This overcurrent protection structure sensitivity is not high, and reaction is comparatively slow, therefore still there is theoretic potential safety hazard.Therefore be necessary to design on existing leakage current detection protection circuit basis and additional there is high precision and movement response overload protecting circuit rapidly.
Summary of the invention
The present invention is directed to the problems referred to above that prior art exists, a kind of leakage current detection protection circuit with accurate overload protection function is provided.
Goal of the invention of the present invention is realized by following scheme: the leakage current detection protection circuit with accurate overload protection function, comprise power input (INPUTL, N), power output end (OUTL, N), major loop K switch 1, electric leakage induction coil, electric leakage control chip IC1, controllable silicon V2 and the electromagnetic trip coil SOL that formation path disconnects to drive major loop switch trip when controlled silicon conducting, also comprise overload protecting circuit, overload protecting circuit comprises the sample resistance R0 be connected between power supply input zero line side INPUTN and power supply output zero line side OUTN, voltage signal on sample resistance R0 is carried out Linear Amplifer linear amplifier circuit and and voltage signal after linear amplifier circuit is amplified and preset voltage value compare and export high level when exceeding preset voltage value and drive controllable silicon V2 conducting and then make electromagnetic trip coil T2 form the voltage comparator circuit of path.
Further, linear amplifier circuit and voltage comparator circuit coordinate peripheral cell to form by a double operational integrated chip IC2.
Further, sample resistance R0 one end the or seven electric capacity 1C7, the 10 resistance 1R10 are connected with the inverting input of the second amplifier in double operational integrated chip IC2, and the sample resistance R0 other end connects publicly.
Further, one end that 10 resistance 1R10 guides the second amplifier inverting input into is also connected with the output of the second amplifier through the one or nine resistance 1R9, the in-phase input end of the second amplifier connects a pair divider resistance through the 11 resistance 1R11, divider resistance comprises the 12 resistance 1R12 and the 13 resistance 1R13, 12 resistance 1R12 one end guides the 11 resistance 1R11 other end into through the one one electric capacity 1C1 ground connection, 13 resistance 1R13 one end guides the 11 resistance 1R11 other end ground connection into, 11 resistance 1R11, 12 resistance 1R12 and the 13 resistance 1R13 common port with jointly between be connected the one or eight electric capacity 1C8.
Further, the one or five electric capacity 1C5 is connected with between the inverting input of double operational integrated chip IC2 second amplifier and output, second amplifier output is also through the one or six electric capacity 1C6 the or eight resistance 1R8 ground connection, half-wave rectifying circuit and π type filter network is also connected with between one or six electric capacity 1C6 the or eight resistance 1R8, half-wave rectifying circuit comprises the one or seven resistance 1R7 and the one one diode 1V1, π type filter network comprises the one or four electric capacity 1C4, one or six resistance 1R6 and the one or two electric capacity 1C2, one or seven resistance 1R7 one end causes the other end between the one or six electric capacity 1C6 the or eight resistance 1R8 and is connected with the one one diode 1V1 anode, one one diode 1V1 negative electrode is through the one or four electric capacity 1C4 ground connection, one or six resistance 1R6 one end causes the one one diode 1V1 other end through the one or two electric capacity 1C2 ground connection.
Further, the earth terminal ground connection of double operational integrated chip IC2, in-phase input end one tunnel the or the five resistance 1R5 of the first amplifier and the one or two another road the one or four of electric capacity 1C2 ground connection resistance 1R4 causes the output of the first amplifier, the inverting input of the first amplifier is connected with a pair comparison resistance through the one or three resistance 1R3, comparison resistance comprises the one one resistance 1R1 and the one or two resistance 1R2, one one resistance 1R1 one end connection the one or three resistance 1R3 other end divides makes two-way, the one one resistance 1R1 other end one tunnel connects another road the 1 electric capacity 1C1 ground connection of power end of double operational integrated chip, one or two resistance 1R2 one end connects the one or three resistance 1R3 other end ground connection, the one or three electric capacity 1C3 is connected between first amplifier output and inverting input.
Further, electric leakage control chip IC1 earth terminal ground connection; Electric leakage control chip IC1 second benchmark input end is connected with output winding N1 one end of electric leakage induction coil; Electric leakage control chip IC1 first benchmark input end Fen Zuo tri-tunnel, the first via and the second benchmark input end short circuit, second tunnel second electric capacity C2 is connected with the output winding N1 other end of electric leakage induction coil, and the 3rd tunnel the 3rd electric capacity C3 connects power end and connects negative feedback output through the second resistance R2; Electric leakage control chip IC1 power end Fen Zuo tri-tunnel, the first via is connected with the power end of double operational integrated chip IC2 through the 3rd diode V3, the 5th resistance R5, and the second tunnel first resistance R1 is connected with controllable silicon V2 anode, the 3rd tunnel first electric capacity C1 ground connection; Drive singal output one tunnel of electric leakage control chip IC1 is connected with the trigger end of controllable silicon V2, and another road is connected with the output of double operational integrated chip IC2 first amplifier through the 4th diode V4 of Opposite direction connection.
Further, controllable silicon V2 minus earth, controllable silicon V2 anode is through the first diode V1 of Opposite direction connection and the first piezo-resistance MOV1 ground connection, and the trigger end of controllable silicon V2 is also through RC filter network ground connection that the 3rd resistance R3 of parallel connection and the 4th electric capacity C4 forms.
Further, electric leakage induction coil comprises magnet ring T1, magnet ring T1 is wound with live wire input coil N2-L and zero line input coil N2-N, first piezo-resistance MOV1 one end is connected with power output end live wire end OUTL through tripping coil SOL, and the first piezo-resistance MOV1 other end one tunnel and zero line input coil N2-N are connected with the power input live wire end not through magnet ring T1 through be connected another Lu Jing tetra-resistance R4, testing button TEST of one end of magnet ring T1.
Further, major loop K switch 1 is the two blade type switch be connected on power supply input live wire end and power supply output zero line side or the hilted broadsword type switch be only connected on power supply input live wire end.
Further, input piezo-resistance MOV is connected with between the live wire end of power input and zero line side; Working station indicator D is connected with between the live wire end of power output end and zero line side; Sample resistance is that Standard resistance range is 5 ~ 20
the constantan wire resistance of level.
Beneficial effect of the present invention is: compared with preset value after Linear Amplifer by the magnitude of voltage (normal operating conditions is almost nil) on sample resistance, sampling voltage value of magnification illustrates when exceeding preset value and occurs overload current, disconnect major loop switch immediately, accuracy of detection is high, is quick on the draw; Circuit design advantages of simple, element is few, and cost is low.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the embodiment of the present invention one.
Fig. 2 is the electrical block diagram of the embodiment of the present invention two.
Embodiment
Below in conjunction with specific embodiments and the drawings, the invention will be further described:
embodiment one
With reference to shown in Fig. 1, the leakage current detection protection circuit with accurate overload protection function of the present invention, comprise power input (INPUTL, N), power output end (OUTL, N), major loop K switch 1, electric leakage induction coil, electric leakage control chip IC1, controllable silicon V2 and the electromagnetic trip coil SOL that formation path disconnects to drive major loop switch trip when controlled silicon conducting, also comprise overload protecting circuit, overload protecting circuit comprises the sample resistance R0 be connected between power supply input zero line side INPUTN and power supply output zero line side OUTN, voltage signal on sample resistance R0 is carried out Linear Amplifer linear amplifier circuit and and voltage signal after linear amplifier circuit is amplified and preset voltage value compare and export high level when exceeding preset voltage value and drive controllable silicon V2 conducting and then make electromagnetic trip coil T2 form the voltage comparator circuit of path.
In the present embodiment, linear amplifier circuit and voltage comparator circuit coordinate peripheral cell to form by a double operational integrated chip IC2.Effective simplification circuit, saves installing space.
Sample resistance R0 one end the or seven electric capacity 1C7, 10 resistance 1R10 is connected with the inverting input (6 pin of IC2) of the second amplifier in double operational integrated chip IC2, the sample resistance R0 other end connects publicly, one end that 10 resistance 1R10 guides the second amplifier inverting input (6 pin of IC2) into is also connected with the output (7 pin of IC2) of the second amplifier through the one or nine resistance 1R9, the in-phase input end (5 pin of IC2) of the second amplifier connects a pair divider resistance through the 11 resistance 1R11, divider resistance comprises the 12 resistance 1R12 and the 13 resistance 1R13, 12 resistance 1R12 one end guides the 11 resistance 1R11 other end into through the one one electric capacity 1C1 ground connection, 13 resistance 1R13 one end guides the 11 resistance 1R11 other end ground connection into, 11 resistance 1R11, 12 resistance 1R12 and the 13 resistance 1R13 common port with jointly between be connected the one or eight electric capacity 1C8.
The one or five electric capacity 1C5 is connected with between the inverting input (6 pin of IC2) of double operational integrated chip IC2 second amplifier and output (7 pin of IC2), second amplifier output is also through the one or six electric capacity 1C6 the or eight resistance 1R8 ground connection, half-wave rectifying circuit and π type filter network is also connected with between one or six electric capacity 1C6 the or eight resistance 1R8, half-wave rectifying circuit comprises the one or seven resistance 1R7 and the one one diode 1V1, π type filter network comprises the one or four electric capacity 1C4, one or six resistance 1R6 and the one or two electric capacity 1C2, one or seven resistance 1R7 one end causes the other end between the one or six electric capacity 1C6 the or eight resistance 1R8 and is connected with the one one diode 1V1 anode, one one diode 1V1 negative electrode is through the one or four electric capacity 1C4 ground connection, one or six resistance 1R6 one end causes the one one diode 1V1 other end through the one or two electric capacity 1C2 ground connection.
Earth terminal (4 pin of the IC2) ground connection of double operational integrated chip IC2, in-phase input end (3 pin of IC2) road the or a five resistance 1R5 of the first amplifier and the one or two another road the one or four of electric capacity 1C2 ground connection resistance 1R4 causes the output (1 pin of IC2) of the first amplifier, the inverting input (2 pin of IC2) of the first amplifier is connected with a pair comparison resistance through the one or three resistance 1R3, comparison resistance comprises the one one resistance 1R1 and the one or two resistance 1R2, one one resistance 1R1 one end connection the one or three resistance 1R3 other end divides makes two-way, the one one resistance 1R1 other end one tunnel connects power end (8 pin of IC2) through the one one electric capacity 1C1 ground connection, one or two resistance 1R2 one end connects the one or three resistance 1R3 other end ground connection, the one or three electric capacity 1C3 is connected between first amplifier output (1 pin of IC2) and inverting input (2 pin of IC2).
Electric leakage control chip IC1 earth terminal ground connection; Electric leakage control chip IC1 second benchmark input end (3 pin of IC1) is connected with output winding N1 one end of electric leakage induction coil; Electric leakage control chip IC1 first benchmark input end (2 pin of IC1) Fen Zuo tri-tunnel, the first via and the second benchmark input end (3 pin of IC1) short circuit, second tunnel second electric capacity C2 is connected with the output winding N1 other end of electric leakage induction coil, and the 3rd tunnel the 3rd electric capacity C3 connects power end (6 pin of IC1) and connects negative feedback output through the second resistance R2; Electric leakage control chip IC1 power end (6 pin of IC1) Fen Zuo tri-tunnel, the first via is connected with the power end (8 pin of IC2) of double operational integrated chip IC2 through the 3rd diode V3, the 5th resistance R5, second tunnel first resistance R1 is connected with controllable silicon V2 anode, the 3rd tunnel first electric capacity C1 ground connection; Drive singal output (5 pin of an IC1) road of electric leakage control chip IC1 is connected with the trigger end of controllable silicon V2, and another road is connected with the output (1 pin of IC2) of double operational integrated chip IC2 first amplifier through the 4th diode V4 of Opposite direction connection.
Controllable silicon V2 minus earth, controllable silicon V2 anode is through the first diode V1 of Opposite direction connection and the first piezo-resistance MOV1 ground connection, and the trigger end of controllable silicon V2 is also through RC filter network ground connection that the 3rd resistance R3 of parallel connection and the 4th electric capacity C4 forms.
Electric leakage induction coil comprises magnet ring T1, magnet ring T1 is wound with live wire input coil N2-L and zero line input coil N2-N, first piezo-resistance MOV1 one end is connected with power output end live wire end OUTL through tripping coil SOL, and the first piezo-resistance MOV1 other end one tunnel and zero line input coil N2-N are connected with the power input live wire end not through magnet ring T1 through be connected another Lu Jing tetra-resistance R4, testing button TEST of one end of magnet ring T1.
In the present embodiment, major loop K switch 1 is for being connected to the two blade type switch on power supply input live wire end and power supply output zero line side.
Input piezo-resistance MOV is connected with between the live wire end of power input and zero line side; Working station indicator D is connected with between the live wire end of power output end and zero line side; Sample resistance is that resistance is 10
constantan wire resistance (the i.e. Standard resistance range 5 ~ 20 of level
).
embodiment two
With reference to shown in Fig. 2, the difference of the present embodiment and embodiment one is: major loop K switch 1 is only be connected to power supply to input hilted broadsword type switch on live wire end.All the other structures are substantially identical with embodiment one.
Although the present invention has illustrated by reference to preferred embodiment and has described, those of ordinary skill in the art should understand, and can be not limited to the description of the present embodiment, in the scope of claims, can make the various changes in form and details.。
Claims (11)
1. there is the leakage current detection protection circuit of accurate overload protection function, comprise power input (INPUTL, N), power output end (OUTL, N), major loop switch (K1), electric leakage induction coil, electric leakage control chip (IC1), controllable silicon (V2) and the electromagnetic trip coil (SOL) that formation path disconnects to drive major loop switch trip when controlled silicon conducting, it is characterized in that: also comprise overload protecting circuit, overload protecting circuit comprises the sample resistance (R0) be connected between power supply input zero line side (INPUTN) and power supply output zero line side (OUTN), voltage signal on sample resistance (R0) is carried out Linear Amplifer linear amplifier circuit and and voltage signal after linear amplifier circuit is amplified and preset voltage value compare and export high level when exceeding preset voltage value and drive controllable silicon (V2) conducting and then make electromagnetic trip coil (T2) form the voltage comparator circuit of path.
2. the leakage current detection protection circuit with accurate overload protection function according to claim 1, is characterized in that: linear amplifier circuit and voltage comparator circuit coordinate peripheral cell to form by a double operational integrated chip (IC2).
3. the leakage current detection protection circuit with accurate overload protection function according to claim 2; it is characterized in that: sample resistance (R0) one end the or seven electric capacity (1C7), the 10 resistance (1R10) are connected with the inverting input of the second amplifier in double operational integrated chip (IC2), sample resistance (R0) other end connects publicly.
4. the leakage current detection protection circuit with accurate overload protection function according to claim 3, it is characterized in that: one end that the 10 resistance (1R10) guides the second amplifier inverting input into is also connected with the output of the second amplifier through the one or nine resistance (1R9), the in-phase input end of the second amplifier connects a pair divider resistance through the 11 resistance (1R11), divider resistance comprises the 12 resistance (1R12) and the 13 resistance (1R13), 12 resistance (1R12) one end guides the 11 resistance (1R11) other end into through the one one electric capacity (1C1) ground connection, 13 resistance (1R13) one end guides the 11 resistance (1R11) other end ground connection into, 11 resistance (1R11), 12 resistance (1R12) and the 13 resistance (1R13) common port with jointly between be connected the one or eight electric capacity (1C8).
5. the leakage current detection protection circuit with accurate overload protection function according to claim 4, is characterized in that: be connected with the one or five electric capacity (1C5) between the inverting input of double operational integrated chip (IC2) second amplifier and output, second amplifier output is also through the one or six electric capacity (1C6) the one or eight resistance (1R8) ground connection, half-wave rectifying circuit and π type filter network is also connected with between one or six electric capacity (1C6) the one or eight resistance (1R8), half-wave rectifying circuit comprises the one or seven resistance (1R7) and the one one diode (1V1), π type filter network comprises the one or four electric capacity (1C4), one or six resistance (1R6) and the one or two electric capacity (1C2), one or seven resistance (1R7) one end causes the other end between the one or six electric capacity (1C6) the one or eight resistance (1R8) and is connected with the one one diode (1V1) anode, one one diode (1V1) negative electrode is through the one or four electric capacity (1C4) ground connection, one or six resistance (1R6) one end causes the one one diode (1V1) other end through the one or two electric capacity (1C2) ground connection.
6. the leakage current detection protection circuit with accurate overload protection function according to claim 5, it is characterized in that: the earth terminal ground connection of double operational integrated chip (IC2), the in-phase input end one tunnel the or five resistance (1R5) of the first amplifier and the one or two another road the one or four resistance (1R4) of electric capacity (1C2) ground connection cause the output of the first amplifier, the inverting input of the first amplifier is connected with a pair comparison resistance through the one or three resistance (1R3), comparison resistance comprises the one one resistance (1R1) and the one or two resistance (1R2), one one resistance (1R1) one end connection the one or three resistance (1R3) other end divides makes two-way, one one resistance (1R1) other end one tunnel connects another road the 1 electric capacity (1C1) ground connection of power end of double operational integrated chip, one or two resistance (1R2) one end connects the one or three resistance (1R3) other end ground connection, the one or three electric capacity (1C3) is connected between first amplifier output and inverting input.
7. the leakage current detection protection circuit with accurate overload protection function according to claim 6, is characterized in that: electric leakage control chip (IC1) earth terminal ground connection; Electric leakage control chip (IC1) second benchmark input end is connected with output winding (N1) one end of electric leakage induction coil; Electric leakage control chip (IC1) first benchmark input end Fen Zuo tri-tunnel, the first via and the second benchmark input end short circuit, second tunnel second electric capacity (C2) is connected with output winding (N1) other end of electric leakage induction coil, and the 3rd tunnel the 3rd electric capacity (C3) connects power end and connects negative feedback output through the second resistance (R2); Electric leakage control chip (IC1) power end Fen Zuo tri-tunnel, the first via is connected with the power end of double operational integrated chip (IC2) through the 3rd diode (V3), the 5th resistance (R5), second tunnel first resistance (R1) is connected with controllable silicon (V2) anode, the 3rd tunnel first electric capacity (C1) ground connection; Drive singal output one tunnel of electric leakage control chip (IC1) is connected with the trigger end of controllable silicon (V2), and another road is connected with the output of double operational integrated chip (IC2) first amplifier through the 4th diode (V4) of Opposite direction connection.
8. the leakage current detection protection circuit with accurate overload protection function according to claim 7; it is characterized in that: controllable silicon (V2) minus earth; controllable silicon (V2) anode is through first diode (V1) of Opposite direction connection and the first piezo-resistance (MOV1) ground connection, and the trigger end of controllable silicon (V2) is also through RC filter network ground connection that the 3rd resistance (R3) of parallel connection and the 4th electric capacity (C4) form.
9. the leakage current detection protection circuit with accurate overload protection function according to claim 8, it is characterized in that: electric leakage induction coil comprises magnet ring (T1), magnet ring (T1) is wound with live wire input coil (N2-L) and zero line input coil (N2-N), first piezo-resistance (MOV1) one end is connected with power output end live wire end (OUTL) through tripping coil (SOL), first piezo-resistance (MOV1) other end one tunnel and zero line input coil (N2-N) to be connected another Lu Jing tetra-resistance (R4) through one end of magnet ring (T1), testing button (TEST) is connected with the power input live wire end not through magnet ring (T1).
10. the leakage current detection protection circuit with accurate overload protection function according to claim 1, is characterized in that: major loop switch (K1) is the two blade type switch be connected on power supply input live wire end and power supply output zero line side or the hilted broadsword type switch be only connected on power supply input live wire end.
11. leakage current detection protection circuits with accurate overload protection function according to claim 1, is characterized in that: be connected with input piezo-resistance (MOV) between the live wire end of power input and zero line side; Working station indicator (D) is connected with between the live wire end of power output end and zero line side; Sample resistance is that Standard resistance range is 5 ~ 20
constantan wire resistance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510706221.5A CN105305374B (en) | 2015-10-27 | 2015-10-27 | Leakage current detection protection circuit with accurate overload protection function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510706221.5A CN105305374B (en) | 2015-10-27 | 2015-10-27 | Leakage current detection protection circuit with accurate overload protection function |
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| CN105305374A true CN105305374A (en) | 2016-02-03 |
| CN105305374B CN105305374B (en) | 2018-06-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106229941A (en) * | 2016-08-31 | 2016-12-14 | 黄金和 | There is the quick acting formula leakage current detection protection circuit of timer-controlled self-inspection function |
| CN110086146A (en) * | 2019-06-03 | 2019-08-02 | 黄华道 | Applied to the overload protecting circuit in earth leakage protective socket |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2472670A (en) * | 2009-06-30 | 2011-02-16 | Siemens Ag | Residual current circuit breaker |
| CN103208776A (en) * | 2013-01-23 | 2013-07-17 | 陈泽 | Breaker circuit with fault self-detection function |
| CN104538954A (en) * | 2014-12-23 | 2015-04-22 | 黄华道 | Power supply device having overcurrent protection function and electric leakage protection function |
-
2015
- 2015-10-27 CN CN201510706221.5A patent/CN105305374B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2472670A (en) * | 2009-06-30 | 2011-02-16 | Siemens Ag | Residual current circuit breaker |
| CN103208776A (en) * | 2013-01-23 | 2013-07-17 | 陈泽 | Breaker circuit with fault self-detection function |
| CN104538954A (en) * | 2014-12-23 | 2015-04-22 | 黄华道 | Power supply device having overcurrent protection function and electric leakage protection function |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106229941A (en) * | 2016-08-31 | 2016-12-14 | 黄金和 | There is the quick acting formula leakage current detection protection circuit of timer-controlled self-inspection function |
| CN106229941B (en) * | 2016-08-31 | 2018-07-13 | 黄金和 | Quick acting formula leakage current detection protection circuit with timer-controlled self-inspection function |
| CN110086146A (en) * | 2019-06-03 | 2019-08-02 | 黄华道 | Applied to the overload protecting circuit in earth leakage protective socket |
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| Publication number | Publication date |
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| CN105305374B (en) | 2018-06-05 |
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