CN103401214A - Electric leakage detection protection circuit with timing self-checking function - Google Patents
Electric leakage detection protection circuit with timing self-checking function Download PDFInfo
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- CN103401214A CN103401214A CN2013103077621A CN201310307762A CN103401214A CN 103401214 A CN103401214 A CN 103401214A CN 2013103077621 A CN2013103077621 A CN 2013103077621A CN 201310307762 A CN201310307762 A CN 201310307762A CN 103401214 A CN103401214 A CN 103401214A
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Abstract
The invention relates to an electric leakage detection protection circuit applied to electric appliances, such as a power socket with an electric leakage protection function, in particular to an electric leakage detection protection circuit with a timing self-checking function. The electric leakage detection protection circuit with the timing self-checking function comprises a power input end, a power output end, a reset button, a main circuit switch, two induction coils, a trip coil, silicon controlled and a control chip, wherein the main circuit switch is linked with the reset button; the two induction coils are used for detecting leakage current and low resistance faults; the trip coil is used for enabling the reset button to drive the main circuit switch to be closed/opened under the action of a magnetic field by matching a mechanical structure; the silicon controlled is used for providing a path for analog leakage current; the control chip is used for controlling the silicon controlled to be closed and opened of the silicon controlled by the two induction coils. The electric leakage detection protection circuit with the timing self-checking function also comprises an induction device and a detection circuit, wherein the induction device is used for inducing the current of the trip coil; the signal output end of the induction device is electrically connected with the detection end of the detection circuit. When the silicon controlled is controlled by the control chip to be conducted to generate the analog leakage current, if voltage signals of detected coil windings are not detected by the detection circuit, a warning signal is sent out.
Description
Technical field
The present invention relates to a kind of leakage current detection protection circuit that is applied to have the electrical equipment such as supply socket of creepage protection function, particularly a kind of leakage current detection protection circuit with timer-controlled self-inspection function.
Background technology
Along with to electrical safety, requiring more and more higher, the electrical equipment such as supply socket with creepage protection function more and more are widely used, deenergization can in time trip when in use procedure, leakage current occurring, but these electrical equipment need manual operation to produce the simulation leakage current to be detected, and as application number, is a kind of leakage current detection protection circuit of announcing in 201010237744.7 Chinese invention patent application; At present, also occurred realizing the prior art that automatically detects, but as application number, be the leakage current detection protection circuit of 201110270316.9 disclosed a kind of timing automatic measuring ability integralities, but its circuit structure is comparatively complicated, degree of intelligence is also lower.
The self check of leakage current detection protection circuit is most important for the safe handling of the electrical equipment such as supply socket with creepage protection function, and existing leakage current detection protection circuit self-checking function is perfect not.
Summary of the invention
In view of this, the invention provides a kind of leakage current detection protection circuit with timer-controlled self-inspection function, self-checking function is more perfect.
The present invention solves the problems of the technologies described above by following technological means:
leakage current detection protection circuit with timer-controlled self-inspection function, comprise power input, power output end, reset button, major loop switch with the reset button interlock, two induction coils for detection of leakage current and low resistance fault, by magnetic fields cooperative mechanical structure, make reset button drive the tripping coil of major loop switch closure/disconnection, for simulation leakage current and simulation low resistance provide the controllable silicon of path and the control chip of controlling the controllable silicon break-make by two induction coil testing results, also comprise induction installation and testing circuit be used to responding to the tripping coil electric current, the signal output part of described induction installation and the test side of testing circuit electrically connect, when control chip is controlled controlled silicon conducting generation simulation leakage current, if testing circuit does not detect the voltage signal of induction installation, send warning signal.
Further, described testing circuit comprises malfunction indicator lamp, and described testing circuit goes out warning signal by lighting malfunction indicator lamp.
further, described leakage current detection protection circuit with timer-controlled self-inspection function also comprises K switch 1, described K switch 1 is in transmission connection with reset button RESET, described K switch 1 comprises moving plate and four fixed contact K1-A, K1-B, K1-C, K1-D, described wherein fixed contact K1-A is electrically connected to the zero line between power input and leakage current by resistance R 4, fixed contact K1-B is electrically connected to the live wire between major loop switch and low resistance fault induction coil L2, fixed contact K1-C is electrically connected to the live wire between major loop switch and power output end, one end of fixed contact K1-D and tripping coil winding electrically connects, for the simulation leakage current provides the controllable silicon of path to comprise controllable silicon SCR 1, one end of the other end of tripping coil winding and controllable silicon SCR 1 electrically connects, the other end of controllable silicon SCR 1 is electrically connected to the zero line between major loop switch and low resistance fault induction coil L2, the control utmost point of controllable silicon SCR 1 and the control end of control chip and testing circuit electrically connect, when reset button RESET pressed, moving plate was by fixed contact K1-D, fixed contact K1-A and fixed contact K1-B conducting, and when reset button RESET pull-up, moving plate is by fixed contact K1-D and fixed contact K1-C conducting.
further, for simulation leakage current and simulation low resistance provide the controllable silicon of path also to comprise controllable silicon SCR 2, live wire between described controllable silicon SCR 2 one ends and power input and leakage current induction coil electrically connects, other end ground connection, the control utmost point of controllable silicon SCR 2 and the control end of testing circuit electrically connect, the test side of testing circuit also electrically connects with the control output end of control chip, 2 conductings of testing circuit clocked flip controllable silicon SCR, and whether the control output end of detecting control chip has signal output, if signal do not detected, testing circuit sends warning signal, and control disconnects controllable silicon SCR 1.
Further; described leakage current detection protection circuit with timer-controlled self-inspection function also comprises primary coil winding N1; described primary coil winding N1 is series between controllable silicon SCR 1 and tripping coil L1 winding; described induction installation is magnetic test coil winding N2; described magnetic test coil winding N2 and the corresponding setting of primary coil winding N1; the end of magnetic test coil winding N2 and the test side of testing circuit electrically connect, other end ground connection.
Further; described leakage current detection protection circuit with timer-controlled self-inspection function also comprises primary coil winding N1; described primary coil winding N1 is as the tripping coil winding; between described primary coil winding N1 connection and controllable silicon SCR 1 and K switch 1 fixed contact K1-D; described induction installation is magnetic test coil winding N2; described magnetic test coil winding N2 and the corresponding setting of tripping coil winding N1, the end of magnetic test coil winding N2 and the test side of testing circuit electrically connect, other end ground connection.
Further; described leakage current detection protection circuit with timer-controlled self-inspection function also comprises primary coil winding N1; described primary coil winding N1 is series between tripping coil L1 winding and K switch 1 fixed contact K1-D; described induction installation is magnetic test coil winding N2; described magnetic test coil winding N2 and the corresponding setting of primary coil winding N1; the end of magnetic test coil winding N2 and the test side of testing circuit electrically connect, other end ground connection.
Further; in described leakage current detection protection circuit with timer-controlled self-inspection function, also comprise a K switch 5 with the reset button interlock; these K switch 5 one ends are connected with the power input live wire, and the other end is connected with controllable silicon SCR 2 anodes by resistance, K5 switch closure during the reset button pull-up.
Further; in described leakage current detection protection circuit with timer-controlled self-inspection function, also comprise a normal open switch K4 with the reset button interlock; described normal open switch K4 comprises a moving contact and two fixed contacts; the moving contact of described normal open switch K4 is electrically connected to the zero line between major loop switch and low resistance fault induction coil L2; two fixed contacts and testing circuit electrically connect; when reset button is descending; moving contact and one of them fixed contact conducting; in reset button when up, moving contact and another fixed contact conducting.
Further, described induction installation is diode D8, the negative pole of the positive pole of described diode D8 and controllable silicon SCR 1 and the test side of testing circuit electrically connect, the positive pole of the negative pole of described diode D8 and diode D1-4 electrically connects, and the fixed contact of the negative pole of described diode D1-4 and normal open switch K4 electrically connects.
Further, also comprise and the diode D7 of diode D8 reverse parallel connection, the negative pole of the negative pole of described diode D7 and controllable silicon SCR 1 and the test side of testing circuit electrically connect, and the positive pole of the positive pole of described diode D7 and diode D1-4 electrically connects.
Beneficial effect of the present invention: the leakage current detection protection circuit with timer-controlled self-inspection function of the present invention; by arranging, detect transformer or detect diode; can realize the automatic detection to parts such as leakage current induction coil, control chip, controllable silicon, tripping coils, improve the fail safe of using.
The accompanying drawing explanation
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the electrical block diagram of the embodiment of the present invention 1;
Fig. 2 is the electrical block diagram of the embodiment of the present invention 2;
Fig. 3 is the electrical block diagram of the embodiment of the present invention 3;
Fig. 4 is the electrical block diagram of the embodiment of the present invention 4;
Fig. 5 is the electrical block diagram of the embodiment of the present invention 4, wherein shows the concrete structure of testing circuit.
Embodiment
The present invention is described in detail below with reference to accompanying drawing.
Current leakage detection protection in the present invention and related peripheral circuit can be referring to accompanying drawing of the present invention and applicant's Chinese invention patent applications such as application number 201010237744.7,201110270316.9 formerly, and its operation principle does not repeat them here.
referring to Fig. 1-Fig. 5, leakage current detection protection circuit with timer-controlled self-inspection function, comprise power input, power output end, reset button RESET, major loop K switch R-2-1 with the reset button interlock, KR-2-2, leakage current induction coil T1 and low resistance fault induction coil T2, by magnetic fields cooperative mechanical structure, make reset button drive the tripping coil L1 of major loop switch closure/disconnection, the controllable silicon SCR 1 of path is provided for simulation leakage current and simulation low resistance, SCR2, and the control chip IC1 that controls the controllable silicon break-make by leakage current induction coil T1 and low resistance fault induction coil T2 testing result, also comprise induction installation and testing circuit be used to responding to the tripping coil electric current, the signal output part of described induction installation and the test side of testing circuit 5 pin electrically connect, when controlled silicon conducting produces the simulation leakage current, induction installation detects the tripping coil electric current, if if testing circuit does not detect the signal of induction installation, send warning signal, the leakage current induction coil is described, control chip, controllable silicon or tripping coil etc. break down, described testing circuit comprises malfunction indicator lamp LED3, and described testing circuit goes out warning signal by lighting malfunction indicator lamp LED3.
also comprise K switch 1, described K switch 1 is in transmission connection with reset button RESET, described K switch 1 comprises moving plate and four fixed contact K1-A, K1-B, K1-C, K1-D, described wherein fixed contact K1-A is electrically connected to the zero line between power input and leakage current by resistance R 4, fixed contact K1-B is electrically connected to the live wire between major loop switch and low resistance fault induction coil L2, fixed contact K1-C is electrically connected to the live wire between major loop switch and power output end, one end of fixed contact K1-D and tripping coil winding electrically connects, for simulation leakage current and simulation low resistance provide the controllable silicon of path to comprise controllable silicon SCR 1, one end of the other end of tripping coil winding and controllable silicon SCR 1 electrically connects, the other end of controllable silicon SCR 1 is electrically connected to the zero line between major loop switch and low resistance fault induction coil L2, the control utmost point of controllable silicon SCR 1 and the control end of control chip and testing circuit electrically connect, when reset button RESET pressed, moving plate was by fixed contact K1-D, fixed contact K1-A and fixed contact K1-B conducting, and when reset button RESET pull-up, moving plate is by fixed contact K1-D and fixed contact K1-C conducting.
Live wire between described controllable silicon SCR 2 one ends and power input and leakage current induction coil electrically connects, other end ground connection, the control utmost point of controllable silicon SCR 2 and the control end of testing circuit electrically connect, the test side of testing circuit also electrically connects with the control output end of control chip, 2 conductings of testing circuit clocked flip controllable silicon SCR, and whether the control output end of detecting control chip has signal output, if signal do not detected, light testing circuit malfunction indicator lamp LED3, and control disconnection controllable silicon SCR 1.
Described leakage current detection protection circuit with timer-controlled self-inspection function also comprises the K switch 5 and the normal open switch K4 that with reset button, link, these K switch 5 one ends are connected with the power input live wire, the other end is connected with controllable silicon SCR 2 anodes by resistance, K5 switch closure during the reset button pull-up; Described normal open switch K4 comprises a moving contact and two fixed contacts, the moving contact of described normal open switch K4 is electrically connected to the zero line between major loop switch and low resistance fault induction coil L2, two fixed contacts and testing circuit electrically connect, when reset button is descending, moving contact and one of them fixed contact conducting, in reset button when up, moving contact and another fixed contact conducting.
Referring to Fig. 1; described leakage current detection protection circuit with timer-controlled self-inspection function as embodiment 1 also comprises primary coil winding N1; primary coil winding N1 is directly as the tripping coil winding of tripping coil; one end of described tripping coil winding N1 mono-end and controllable silicon SCR 1 electrically connects; described induction installation is magnetic test coil winding N2; described magnetic test coil winding N2 and the corresponding setting of tripping coil winding N1; the end of magnetic test coil winding N2 and the test side of testing circuit electrically connect, other end ground connection.
Referring to Fig. 2; described leakage current detection protection circuit with timer-controlled self-inspection function as embodiment 2 also comprises primary coil winding N1; described primary coil winding N1 is series between tripping coil L1 winding and K switch 1 fixed contact K1-D; described induction installation is magnetic test coil winding N2; described magnetic test coil winding N2 and the corresponding setting of primary coil winding N1; the end of magnetic test coil winding N2 and the test side of testing circuit electrically connect, other end ground connection.
Referring to Fig. 3; described leakage current detection protection circuit with timer-controlled self-inspection function as embodiment 3 also comprises primary coil winding N1; described primary coil winding N1 is series between tripping coil L1 winding and controllable silicon SCR 1; described induction installation is magnetic test coil winding N2; described magnetic test coil winding N2 and the corresponding setting of primary coil winding N1; the end of magnetic test coil winding N2 and the test side of testing circuit electrically connect, other end ground connection.
Referring to Fig. 4, induction installation described in the present embodiment is diode D8, the negative pole of the positive pole of described diode D8 and controllable silicon SCR 1 and the test side of testing circuit electrically connect, the positive pole of the negative pole of described diode D8 and diode D1-4 electrically connects, and the fixed contact of the negative pole of described diode D1-4 and normal open switch K4 electrically connects; Also comprise the diode D7 with diode D8 reverse parallel connection; the negative pole of the negative pole of described diode D7 and controllable silicon SCR 1 and the test side of testing circuit electrically connect; the positive pole of the positive pole of described diode D7 and diode D1-4 electrically connects, and diode D7 can play the effect of protection.
The concrete structure of testing circuit has been shown in Fig. 5, but has been not limited to structure shown in Figure 5, those skilled in the art can be according to the requirement in the present techniques scheme, the testing circuit of designed, designed identical function.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (11)
1. the leakage current detection protection circuit that has the timer-controlled self-inspection function, comprise power input, power output end, reset button, major loop switch with the reset button interlock, two induction coils for detection of leakage current and low resistance fault, by magnetic fields cooperative mechanical structure, make reset button drive the tripping coil of major loop switch closure/disconnection, for the simulation leakage current provides the controllable silicon of path and the control chip of controlling the controllable silicon break-make by two induction coil testing results, it is characterized in that: also comprise induction installation and testing circuit be used to responding to the tripping coil electric current, the signal output part of described induction installation and the test side of testing circuit electrically connect, when producing the simulation leakage current, if testing circuit does not detect the signal of induction installation, send warning signal.
2. the leakage current detection protection circuit with timer-controlled self-inspection function according to claim 1, it is characterized in that: described testing circuit comprises malfunction indicator lamp, described testing circuit goes out warning signal by lighting malfunction indicator lamp.
3. the leakage current detection protection circuit with timer-controlled self-inspection function according to claim 1, it is characterized in that: described leakage current detection protection circuit with timer-controlled self-inspection function also comprises switch (K1), described switch (K1) is in transmission connection with reset button (RESET), described switch (K1) comprises moving plate and four fixed contact (K1-A, K1-B, K1-C, K1-D), described wherein fixed contact (K1-A) is electrically connected to the zero line between power input and leakage current by resistance (R7), fixed contact (K1-B) is electrically connected to the live wire between major loop switch and low resistance fault induction coil (L2), fixed contact (K1-C) is electrically connected to the live wire between major loop switch and power output end, fixed contact (K1-D) electrically connects with an end of tripping coil winding, for the simulation leakage current provides the controllable silicon of path to comprise controllable silicon (SCR1), one end of the other end of tripping coil winding and controllable silicon (SCR1) electrically connects, the other end of controllable silicon (SCR1) is electrically connected to the zero line between major loop switch and low resistance fault induction coil (L2), the control utmost point of controllable silicon (SCR1) and the control end of control chip electrically connect, while pressing, moving plate is by fixed contact (K1-D), fixed contact (K1-A) and fixed contact (K1-B) conducting when reset button (RESET), and when reset button (RESET) pull-up, moving plate is by fixed contact (K1-D) and fixed contact (K1-C) conducting.
4. the leakage current detection protection circuit with timer-controlled self-inspection function according to claim 1, it is characterized in that: for the simulation leakage current provides the controllable silicon of path also to comprise controllable silicon (SCR2), live wire between described controllable silicon (SCR2) end and power input and leakage current induction coil electrically connects, other end ground connection, the control utmost point of controllable silicon (SCR2) and the control end of testing circuit electrically connect, the test side of testing circuit also electrically connects with the control output end of control chip, testing circuit clocked flip controllable silicon (SCR2) conducting, and whether the control output end of detecting control chip has signal output, if signal do not detected, testing circuit sends warning signal, and control disconnects controllable silicon (SCR1).
5. the described leakage current detection protection circuit with timer-controlled self-inspection function of any one according to claim 1-4, it is characterized in that: described leakage current detection protection circuit with timer-controlled self-inspection function also comprises primary coil winding (N1), described primary coil winding (N1) is series between controllable silicon (SCR1) and tripping coil (L1) winding, described induction installation is magnetic test coil winding (N2), described magnetic test coil winding (N2) and the corresponding setting of primary coil winding (N1), one end of magnetic test coil winding (N2) and the test side of testing circuit electrically connect, other end ground connection.
6. the described leakage current detection protection circuit with timer-controlled self-inspection function of any one according to claim 1-4, it is characterized in that: described leakage current detection protection circuit with timer-controlled self-inspection function also comprises primary coil winding (N1), described primary coil winding (N1) is as the tripping coil winding, described primary coil winding (N1) is connected between controllable silicon (SCR1) and switch (K1) fixed contact (K1-D), described induction installation is magnetic test coil winding (N2), described magnetic test coil winding (N2) and the corresponding setting of tripping coil winding (N1), one end of magnetic test coil winding (N2) and the test side of testing circuit electrically connect, other end ground connection.
7. the described leakage current detection protection circuit with timer-controlled self-inspection function of any one according to claim 1-4, it is characterized in that: described leakage current detection protection circuit with timer-controlled self-inspection function also comprises primary coil winding (N1), described primary coil winding (N1) is series between tripping coil (L1) winding and switch (K1) fixed contact (K1-D), described induction installation is magnetic test coil winding (N2), described magnetic test coil winding (N2) and the corresponding setting of primary coil winding (N1), one end of magnetic test coil winding (N2) and the test side of testing circuit electrically connect, other end ground connection.
8. the described leakage current detection protection circuit with timer-controlled self-inspection function of any one according to claim 1-4; it is characterized in that: in described leakage current detection protection circuit with timer-controlled self-inspection function, also comprise a switch (K5) with the reset button interlock; this switch (K5) end is connected with the power input live wire; the other end is connected with controllable silicon (SCR2) anode by resistance, K5 switch closure during the reset button pull-up.
9. the described leakage current detection protection circuit with timer-controlled self-inspection function of any one according to claim 1-4, it is characterized in that: in described leakage current detection protection circuit with timer-controlled self-inspection function, also comprise a normal open switch (K4) with the reset button interlock, described normal open switch (K4) comprises a moving contact and two fixed contacts, the moving contact of described normal open switch (K4) is electrically connected to the zero line between major loop switch and low resistance fault induction coil (L2), two fixed contacts and testing circuit electrically connect, when reset button is descending, moving contact and one of them fixed contact conducting, in reset button when up, moving contact and another fixed contact conducting.
10. the leakage current detection protection circuit with timer-controlled self-inspection function according to claim 9; it is characterized in that: described induction installation is diode (D8); the positive pole of described diode (D8) and the negative pole of controllable silicon SCR 1 and the test side of testing circuit electrically connect; the positive pole of the negative pole of described diode (D8) and diode (D1-4) electrically connects, and the fixed contact of the negative pole of described diode (D1-4) and normal open switch (K4) electrically connects.
11. the leakage current detection protection circuit with timer-controlled self-inspection function according to claim 10; it is characterized in that: also comprise the diode (D7) with diode (D8) reverse parallel connection; the negative pole of described diode (D7) and the negative pole of controllable silicon SCR 1 and the test side of testing circuit electrically connect, and the positive pole of the positive pole of described diode (D7) and diode (D1-4) electrically connects.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013103077621A CN103401214A (en) | 2013-07-17 | 2013-07-17 | Electric leakage detection protection circuit with timing self-checking function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013103077621A CN103401214A (en) | 2013-07-17 | 2013-07-17 | Electric leakage detection protection circuit with timing self-checking function |
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| CN103401214A true CN103401214A (en) | 2013-11-20 |
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| CN2013103077621A Pending CN103401214A (en) | 2013-07-17 | 2013-07-17 | Electric leakage detection protection circuit with timing self-checking function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103490377A (en) * | 2013-09-27 | 2014-01-01 | 温州市万盛电器有限公司 | Protection circuit for electric leakage detection |
| CN108828351A (en) * | 2018-05-18 | 2018-11-16 | 国网辽宁省电力有限公司电力科学研究院 | A kind of highly reliable chip protective device self-checking circuit |
| CN109061360A (en) * | 2018-06-21 | 2018-12-21 | 浙江巨磁智能技术有限公司 | The safe self-checking system of earth leakage protective and its self checking method |
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| CN102074930A (en) * | 2009-11-19 | 2011-05-25 | 黄华道 | Electric leakage detection protective circuit |
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| CN201422007Y (en) * | 2009-04-22 | 2010-03-10 | 黄华道 | Electric leakage inspecting protection circuit |
| CN101872956A (en) * | 2009-04-22 | 2010-10-27 | 黄华道 | Leakage current detection protection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103490377A (en) * | 2013-09-27 | 2014-01-01 | 温州市万盛电器有限公司 | Protection circuit for electric leakage detection |
| CN108828351A (en) * | 2018-05-18 | 2018-11-16 | 国网辽宁省电力有限公司电力科学研究院 | A kind of highly reliable chip protective device self-checking circuit |
| CN109061360A (en) * | 2018-06-21 | 2018-12-21 | 浙江巨磁智能技术有限公司 | The safe self-checking system of earth leakage protective and its self checking method |
| CN109061360B (en) * | 2018-06-21 | 2020-12-15 | 浙江巨磁智能技术有限公司 | Leakage protection safety self-checking system and self-checking method thereof |
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Application publication date: 20131120 |