CN103490377A - Protection circuit for electric leakage detection - Google Patents

Protection circuit for electric leakage detection Download PDF

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Publication number
CN103490377A
CN103490377A CN201310452956.0A CN201310452956A CN103490377A CN 103490377 A CN103490377 A CN 103490377A CN 201310452956 A CN201310452956 A CN 201310452956A CN 103490377 A CN103490377 A CN 103490377A
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CN
China
Prior art keywords
switch
protection circuit
leakage current
current detection
detection protection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201310452956.0A
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Chinese (zh)
Inventor
黄金和
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WENZHOU VAN-SHEEN ELECTRIC APPLIANCE Co Ltd
Wenzhou Van sheen Electric Appliance Co Ltd
Original Assignee
WENZHOU VAN-SHEEN ELECTRIC APPLIANCE Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by WENZHOU VAN-SHEEN ELECTRIC APPLIANCE Co Ltd filed Critical WENZHOU VAN-SHEEN ELECTRIC APPLIANCE Co Ltd
Priority to CN201310452956.0A priority Critical patent/CN103490377A/en
Publication of CN103490377A publication Critical patent/CN103490377A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a protection circuit for electric leakage detection. The protection circuit for the electric leakage detection is applied to electric appliances such as power sockets with an electric leakage protection function. The protection circuit for the electric leakage detection comprises a power input end, a power output end, a power user load end, a reset button, a major loop switch, two induction coils, a trip coil, a silicon controlled rectifier, a control chip and a test button, and further comprises a switch. The major loop switch is in linkage with the reset button, the two induction coils are used for detecting leakage currents and low resistance faults, the trip coil is matched with a mechanical structure through magnetic field action to enable the reset button to drive the major loop switch to be connected and disconnected, the silicon controlled rectifier provides a channel for simulating the leakage currents, the control chip controls the silicon controlled rectifier to be connected and disconnected through detection results of the two induction coils, and the switch is provided with one movable contact and at least one stationary contact. According to the protection circuit for the electric leakage detection, materials can be saved, and the structure can be simplified; light-emitting diodes are used for indicating wiring errors, the service life of the trip coil and the service life of a self-detecting circuit, direct view is achieved, and safety is improved; the circuit is in a non-working state after a power source is connected, the trip coil, an integrated circuit and other electronic components do not work, therefore, energy is saved, and the service life is prolonged.

Description

Leakage current detection protection circuit
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.
Background technology
Along with requiring more and more higher to electrical safety, the electrical equipment such as supply socket with creepage protection function more and more are widely used, deenergization in time can trip while in use procedure, leakage current occurring, but these electrical equipment need manual operation to produce the simulation leakage current to be detected, as a kind of leakage current detection protection circuit of announcing in the application number Chinese invention patent application that is 201010237744.7; At present, the prior art automatically detected has also appearred realizing, but as the application number leakage current detection protection circuit that is 201110270316.9 disclosed a kind of timing automatic measuring ability integralities, but its circuit structure is comparatively complicated, and degree of intelligence is also lower.
But existing leakage current detection protection circuit is comparatively complicated; element used is more; life-span and not prompting intuitively of false wiring to tripping coil; in running order after simultaneously existing leakage current detection protection circuit access power supply; the waste electric energy; and cause each components and parts electrified ageing, shortened useful life.
Summary of the invention
In view of this, the invention provides a kind of leakage current detection protection circuit, structure is more reasonable, can save the use of element material.
The present invention solves the problems of the technologies described above by following technological means:
Leakage current detection protection circuit, comprise power input, power output end, power supply user load 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, self-checking circuit and testing button, also comprise K switch 1, described K switch 1 has a moving contact and at least one fixed contact, one end of the moving contact of K switch 1 or fixed contact and tripping coil electrically connects, and and major loop K switch R2-1 and power output end between live wire electrically connect, accordingly, fixed contact of K switch 1 or moving contact are electrically connected to the zero line of power input by artifical resistance R7.
Further, described K switch 1 has a moving contact and two fixed contacts, in these three contacts, one end of contact and tripping coil electrically connects, and and major loop K switch R2-1 and power output end between live wire electrically connect, contact is electrically connected to the zero line of power input by artifical resistance R7, and the live wire between contact and induction coil T2 and major loop K switch R2-1 electrically connects.
Further, described leakage current detection protection circuit also comprises K switch 5, and described K switch 5 is electrically connected between the anode of power input live wire and controllable silicon SCR 2.
Further, the anode of controllable silicon SCR 1 electrically connects by an end of diode D6 and tripping coil, and the anode of controllable silicon SCR 1 is connected with the automatic test side of self-checking circuit by resistance R 22, and the negative electrode of controllable silicon SCR 1 is connected with zero line by K switch 2.
Further; described leakage current detection protection circuit also comprises K switch 2 and K switch 3; the inverter input of described K switch 2 one ends and testing circuit electrically connects; zero line between the other end of K switch 2 and major loop K switch R2-2 and power output end electrically connects; zero line between described K switch 3 one ends and major loop K switch R2-2 and power output end electrically connects; the anode of the other end of K switch 3 and diode D2 electrically connects, and the anode of the negative electrode of diode D2 and controllable silicon SCR 1 electrically connects.
Further; described leakage current detection protection circuit also comprises diode D6 and diode D7; after described diode D6 and diode D7 reverse parallel connection, an end connects with the cathodic electricity of controllable silicon SCR 1, and the zero line between the other end and major loop K switch R2-2 and power output end electrically connects.
Further; described leakage current detection protection circuit also comprises inhales electric energy sheet metal M1; described suction electric energy sheet metal M1 mono-end is connected with live wire end or the zero line side of power input, and the other end extends and has gap with zero line side or live wire end to zero line side or the live wire end of power input.
Further; described leakage current detection protection circuit also comprises K switch R-3-1, K switch R-3-2, LED 2; one end of power supply user load end is electrically connected to the live wire between power output end by K switch R-3-1; the other end of power supply user load end is electrically connected to the anode of major loop switch or LED 2 by K switch R-3-2, and the negative electrode of LED 2 is electrically connected to the live wire between power output end by K switch R-3-1.
Further, also comprise LED 1 and resistance R 5, an end of described LED 1 electrically connects by resistance R 5 and an end of K switch 3, and the other end of the other end of LED 1 and K switch 3 electrically connects.
Further, also be provided with K switch 4 between described LED 1 and K switch 3.
Further, also comprise LED 1 and resistance R 5, the end that described K switch 3 electrically connects with the anode of diode D2 also connects with the cathodic electricity of LED 1, and the anode of LED 1 electrically connects by resistance R 5 and the inverter input of testing circuit.
Beneficial effect of the present invention: realize reset switch and test switching function with a switch, another switch is realized zero-power line switch and false wiring switching function, can save material, simplified structure; With light-emitting diode indication wiring error and tripping coil and self-checking circuit life-span, more directly perceived, improved fail safe; The not operating state of this circuit after connecting with the mains, the electronic components such as tripping coil, integrated circuit are not worked, and energy-conserving and environment-protective and effectively prevent that electronic component is charged aging extend components and parts useful life.
The accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
The electrical block diagram that Fig. 1 is the embodiment of the present invention 1;
The electrical block diagram that Fig. 2 is the embodiment of the present invention 2;
The electrical block diagram that Fig. 3 is the embodiment of the present invention 3;
The electrical block diagram that Fig. 4 is the embodiment of the present invention 4;
The electrical block diagram that Fig. 5 is the embodiment of the present invention 5;
The electrical block diagram that Fig. 6 is the embodiment of the present invention 6;
The electrical block diagram that Fig. 7 is the embodiment of the present invention 7.
 
Embodiment
Below with reference to accompanying drawing, the present invention is described in detail.
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. 1-3, leakage current detection protection circuit, comprise power input HOT, WHITE, power output end, power supply user load end LOAD, reset button RESET, major loop K switch R2-1 with the reset button interlock, KR2-2, two induction coil T1 for detection of leakage current and low resistance fault, T2, by magnetic fields cooperative mechanical structure, make reset button drive the tripping coil L1 of major loop switch closure/disconnection, for the simulation leakage current provides the controllable silicon SCR 1 of path and passes through two induction coil T1, the T2 testing result is controlled the control chip IC1 of controllable silicon break-make, self-checking circuit and testing button TEST, also comprise K switch 1, described K switch 1 has a moving contact and two fixed contacts, one end of the moving contact of K switch 1 or fixed contact and tripping coil electrically connects, and and major loop K switch R2-1 and power output end between live wire electrically connect, fixed contact of K switch 1 or moving contact are electrically connected to the zero line of power input by artifical resistance R7, and the live wire between another fixed contact of K switch 1 and induction coil T2 and major loop K switch R2-1 electrically connects.Described leakage current detection protection circuit also comprises K switch 5, and described K switch 5 is electrically connected between the anode of power input live wire and controllable silicon SCR 2.
Described self-checking circuit comprises IC2 and peripheral circuit thereof.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 IC2 electrically connect, the test side of IC2 also electrically connects with the SCR1 male or female, 2 conductings of testing circuit clocked flip controllable silicon SCR, and detect whether conducting of SCR1, if not conducting of SCR1 lights testing circuit malfunction indicator lamp LED3.
Described leakage current detection protection circuit also comprises K switch R-3-1, K switch R-3-2, LED 2; one end of power supply user load end is electrically connected to the live wire between power output end by K switch R-3-1; the other end of power supply user load end is electrically connected to the anode of major loop switch or LED 2 by K switch R-3-2, and the negative electrode of LED 2 is electrically connected to the live wire between power output end by K switch R-3-1.
Described leakage current detection protection circuit also comprises diode D6 and diode D7; after described diode D6 and diode D7 reverse parallel connection; one end connects with the cathodic electricity of controllable silicon SCR 1, and the zero line between the other end and major loop K switch R2-2 and power output end electrically connects.
Described leakage current detection protection circuit also comprises inhales electric energy sheet metal M1; described suction electric energy sheet metal M1 mono-end is connected with live wire end or the zero line side of power input, and the other end extends and has gap with zero line side or live wire end to zero line side or the live wire end of power input.
Described leakage current detection protection circuit also comprises K switch 2 and K switch 3; the inverter input of described K switch 2 one ends and testing circuit electrically connects; zero line between the other end of K switch 2 and major loop K switch R2-2 and power output end electrically connects; zero line between described K switch 3 one ends and major loop K switch R2-2 and power output end electrically connects; the anode of the other end of K switch 3 and diode D2 electrically connects, and the anode of the negative electrode of diode D2 and controllable silicon SCR 1 electrically connects.
Also comprise LED 1 and resistance R 5.
In embodiment 1, referring to Fig. 1, an end of described LED 1 electrically connects by resistance R 5 and an end of K switch 3, and the other end of the other end of LED 1 and K switch 3 electrically connects.
In embodiment 2, referring to Fig. 2, the end that described K switch 3 electrically connects with the anode of diode D2 also connects with the cathodic electricity of LED 1, and the anode of LED 1 electrically connects by resistance R 5 and the conversion electric power input of testing circuit.
In embodiment 3, referring to Fig. 3, with embodiment 1 difference, be, also be provided with K switch 4 between described LED 1 and K switch 3.
And embodiment 4-6 and embodiment 1-3 difference are, 1 of described K switch has a fixed contact, and described fixed contact is electrically connected to the zero line of power input by artifical resistance R7.
Embodiment 7 is with embodiment 4 main difference parts, diode D6 and the diode D7 of reverse parallel connection are not set in circuit, the anode of controllable silicon SCR 1 connects with an end of tripping coil and the cathodic electricity of diode D2 by diode D6 in the same way, the anode of controllable silicon SCR 1 is connected with the automatic test side of self-checking circuit by resistance R 22, and the negative electrode of controllable silicon SCR 1 is connected with zero line by K switch 2.
In the present invention, after K switch 1 closure, form closed-loop path, can make reset button reset, make K1 there is the function that detects and trip simultaneously.
Under factory state, K2 is in off-state, and K3 is in closure state; circuit and the power input of earth leakage protective part are disconnected; when user error is connected with power supply input power with load end simultaneously, automatically the output moving contact can be disconnected, also very safe, more save power supply simultaneously.
When tripping coil L1 and the termination of self-checking circuit drag flow diode service life, diode (LED) 1 does not work, and tripping coil and self-checking circuit drag flow diode do not have end-of-life, and work diode (LED) 1 is bright, can straight tube ground the operating state of indication tripping coil and self-checking circuit, ensure safety.
The LED1 lamp that do not reset does not work, reset button work pull-up or lifting, and mistake K switch 3 disconnects, and indicator light is bright; Reset button is jumped and is closed, and work LED1 lamp extinguishes.
The reset button LED1 that do not work does not work, reset button work pull-up or lifting, and power on circuitry K switch 2 closures, false wiring K switch 3 disconnects, and the bright or reset button of LED1 is jumped and is closed, and work LED1 lamp extinguishes.
K switch R-3-1 is the normally closed switch closure, and under normal condition, diode (LED) 2 is in the state of not working.When false wiring, K switch R-3-2 is connected with diode (LED) 2, and the false wiring indicator light is bright, proves false wiring.
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. leakage current detection protection circuit, comprise power input, power output end, power supply user load 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, self-checking circuit and testing button, it is characterized in that: also comprise switch (K1), described switch (K1) has a moving contact and at least one fixed contact, the moving contact of switch (K1) or an end of fixed contact and tripping coil electrically connect, and and major loop switch (KR2-1) and power output end between live wire electrically connect, accordingly, fixed contact of switch (K1) or moving contact are electrically connected to the zero line of power input by artifical resistance R7.
2. leakage current detection protection circuit according to claim 1; it is characterized in that: described switch (K1) has a moving contact and two fixed contacts; in these three contacts; one end of contact and tripping coil electrically connects; and and major loop switch (KR2-1) and power output end between live wire electrically connect; contact is electrically connected to the zero line of power input by artifical resistance R7, and the live wire between contact and induction coil (T2) and major loop switch (KR2-1) electrically connects.
3. leakage current detection protection circuit according to claim 1, it is characterized in that: described leakage current detection protection circuit also comprises switch (K5), described switch (K5) is electrically connected between the anode of power input live wire and controllable silicon (SCR2).
4. leakage current detection protection circuit according to claim 1; it is characterized in that: the anode of controllable silicon (SCR1) electrically connects by diode (D6) and an end of tripping coil; the anode of controllable silicon (SCR1) is connected with the automatic test side of self-checking circuit by resistance (R22), and the negative electrode of controllable silicon (SCR1) is connected with zero line by switch (K2).
5. according to the described leakage current detection protection circuit of any one in claim 1-4, it is characterized in that: described leakage current detection protection circuit also comprises switch (K2) and switch (K3), the power input of described switch (K2) end and testing circuit electrically connects, zero line between the other end of switch (K2) and major loop switch (KR2-2) and power output end electrically connects, zero line between described switch (K3) end and major loop switch (KR2-2) and power output end electrically connects, the anode of the other end of switch (K3) and diode (D2) electrically connects, the anode of the negative electrode of diode (D2) and controllable silicon (SCR1) electrically connects.
6. leakage current detection protection circuit according to claim 1; it is characterized in that: described leakage current detection protection circuit also comprises diode (D6) and diode (D7); after described diode (D6) and diode (D7) reverse parallel connection; one end connects with the cathodic electricity of controllable silicon (SCR1), and the zero line between the other end and major loop switch (KR2-2) and power output end electrically connects.
7. leakage current detection protection circuit according to claim 1; it is characterized in that: described leakage current detection protection circuit also comprises inhales electric energy sheet metal (M1); described suction electric energy sheet metal (M1) end is connected with live wire end or the zero line side of power input, and the other end extends and has gap with zero line side or live wire end to zero line side or the live wire end of power input.
8. leakage current detection protection circuit according to claim 1, it is characterized in that: described leakage current detection protection circuit also comprises switch (KR-3-1), switch (KR-3-2), light-emitting diode (LED2), one end of power supply user load end is electrically connected to the live wire between power output end by switch (KR-3-1), the other end of power supply user load end is electrically connected to the anode of major loop switch or light-emitting diode (LED2) by switch (KR-3-2), the negative electrode of light-emitting diode (LED2) is electrically connected to the live wire between power output end by switch (KR-3-1).
9. leakage current detection protection circuit according to claim 8; it is characterized in that: also comprise light-emitting diode (LED1) and resistance (R5); one end of described light-emitting diode (LED1) electrically connects by resistance (R5) and an end of switch (K3), and the other end of the other end of light-emitting diode (LED1) and switch (K3) electrically connects.
10. leakage current detection protection circuit according to claim 8, is characterized in that: between described light-emitting diode (LED1) and switch (K3), also be provided with switch (K4).
11. leakage current detection protection circuit according to claim 8; it is characterized in that: also comprise light-emitting diode (LED1) and resistance (R5); the end that described switch (K3) electrically connects with the anode of diode (D2) also connects with the cathodic electricity of light-emitting diode (LED1), and the anode of light-emitting diode (LED1) electrically connects by resistance (R5) and the power input of testing circuit.
CN201310452956.0A 2013-09-27 2013-09-27 Protection circuit for electric leakage detection Pending CN103490377A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103887765A (en) * 2014-03-25 2014-06-25 温州市万盛电器有限公司 Electric leakage detection protection circuit with discrete component timing self-detection 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
CN104104055A (en) * 2014-06-16 2014-10-15 温州市万盛电器有限公司 Electric leakage detection protection circuit with timed self-checking and reverse wiring protection functions
CN105119109A (en) * 2015-08-10 2015-12-02 珠海格力电器股份有限公司 Electric leakage detection method and socket
CN108761265A (en) * 2018-05-30 2018-11-06 浙江朗威微系统有限公司 Electric-leakage detection circuit period system safety testing device and its detection method
US10209287B2 (en) 2016-08-31 2019-02-19 Wenzhou Van-Sheen Electric Appliance Co., Ltd Quick-action leakage detection protection circuit having regular self-checking function

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Publication number Priority date Publication date Assignee Title
CN101047294A (en) * 2006-03-31 2007-10-03 黄华道 Leakage protection socket
CN101222100A (en) * 2007-01-10 2008-07-16 黄华道 Creepage protecting socket with life end checking function
CN101227044A (en) * 2007-01-17 2008-07-23 黄华道 New type electric leakageproof socket
CN101237138A (en) * 2008-02-13 2008-08-06 浙江正泰建筑电器有限公司 Super thunder-prevention protection mobile jack
CN103219702A (en) * 2013-03-21 2013-07-24 温州市万盛电器有限公司 Electric leakage detection protection circuit capable of performing timed self-detection
CN103401214A (en) * 2013-07-17 2013-11-20 温州市万盛电器有限公司 Electric leakage detection protection circuit with timing self-checking function

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101047294A (en) * 2006-03-31 2007-10-03 黄华道 Leakage protection socket
CN101222100A (en) * 2007-01-10 2008-07-16 黄华道 Creepage protecting socket with life end checking function
CN101227044A (en) * 2007-01-17 2008-07-23 黄华道 New type electric leakageproof socket
CN101237138A (en) * 2008-02-13 2008-08-06 浙江正泰建筑电器有限公司 Super thunder-prevention protection mobile jack
CN103219702A (en) * 2013-03-21 2013-07-24 温州市万盛电器有限公司 Electric leakage detection protection circuit capable of performing timed self-detection
CN103401214A (en) * 2013-07-17 2013-11-20 温州市万盛电器有限公司 Electric leakage detection protection circuit with timing self-checking function

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103887765A (en) * 2014-03-25 2014-06-25 温州市万盛电器有限公司 Electric leakage detection protection circuit with discrete component timing self-detection 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
CN103887765B (en) * 2014-03-25 2017-01-18 温州市万盛电器有限公司 Electric leakage detection protection circuit with discrete component timing self-detection function
CN104104055A (en) * 2014-06-16 2014-10-15 温州市万盛电器有限公司 Electric leakage detection protection circuit with timed self-checking and reverse wiring protection functions
CN105119109A (en) * 2015-08-10 2015-12-02 珠海格力电器股份有限公司 Electric leakage detection method and socket
CN105119109B (en) * 2015-08-10 2017-12-26 珠海格力电器股份有限公司 Electrical leakage detecting method and socket
US10209287B2 (en) 2016-08-31 2019-02-19 Wenzhou Van-Sheen Electric Appliance Co., Ltd Quick-action leakage detection protection circuit having regular self-checking function
CN108761265A (en) * 2018-05-30 2018-11-06 浙江朗威微系统有限公司 Electric-leakage detection circuit period system safety testing device and its detection method

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Application publication date: 20140101