CN104143812A - Electric leakage detection protection circuit - Google Patents

Electric leakage detection protection circuit Download PDF

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Publication number
CN104143812A
CN104143812A CN201410367800.7A CN201410367800A CN104143812A CN 104143812 A CN104143812 A CN 104143812A CN 201410367800 A CN201410367800 A CN 201410367800A CN 104143812 A CN104143812 A CN 104143812A
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CN
China
Prior art keywords
leakage current
power input
power
moving contact
self check
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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
CN201410367800.7A
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Chinese (zh)
Inventor
黄华道
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黄华道
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Application filed by 黄华道 filed Critical 黄华道
Priority to CN201410367800.7A priority Critical patent/CN104143812A/en
Publication of CN104143812A publication Critical patent/CN104143812A/en
Pending legal-status Critical Current

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Abstract

The invention provides an electric leakage detection protection circuit. The electric leakage detection protection circuit comprises a power input end, a power user end, a power output end, a reset button, double induction coils, a trip coil and a control chip IC1. A pair of static contacts are led out of the power input end and a pair of static contacts are led out of the power output end, and a pair of moving contacts are led out of the power user end. Each moving contact comprises a flexible wire and a moving contact lever, wherein the flexible wire and the moving contact lever are led out of the power user end. The moving contact levers can conduct seesaw motion and are provided with elastic reset mechanisms, one end of each moving contact lever makes contact with the corresponding static contact led out of the power output end when the reset button is not reset, and the other end of each moving contact lever makes contact with the corresponding static contact led out of the power input end when the reset button is reset successfully. The electric leakage detection protection circuit has the advantages that the flexible wires and the seesaw type moving contact levers are led out of the power user end, a main loop circuit switch and a diverter switch are combined together, it is guaranteed that the power input end, the power user end and the power output end are always formed by two pairs of conductors and elements are reduced at the same time, labor hours are reduced, and cost is reduced.

Description

Leakage current detection protection circuit
Technical field
The present invention relates to electric leakage protection technology field, specifically refer to a kind of leakage current detection protection circuit.
Background technology
Application number is that 201310452956.0 the disclosed leakage current detection protection circuit of application for a patent for invention comprises power input, power supply user side, power output end, reset button, major loop switch with reset button interlock, two induction coils for detection of leakage current and low resistance fault, by magnetic fields, drive built-in iron core cooperative mechanical structure to make reset button drive the tripping coil of major loop switch closure/disconnection, the control chip and the timer-controlled self-inspection circuit that for simulating leakage current, the controllable silicon of path are provided and pass through two known controllable silicon break-makes of induction coil testing result, its be provided with one with the normal open switch K1 of reset button interlock, when pressing reset button, factory state drive normal open switch K1 closed, simulation leakage current generating resistance R 7 is by power input short circuit, control chip detects leakage current by two induction coils, drive controlled silicon conducting, tripping coil obtains electric rear iron core and moves the snap close driving in earth leakage protective socket and move, reset button lead is driven major loop switch closed by rear rising the in lock dog lockhole hook location, this circuit is in the life-span not under state of termination, if reverse wiring (mains supply mistake is connected to power output end) disconnects the normally closed switch of power output end and power supply user side by mechanisms such as control chip, controllable silicons, if having damaged, the mechanisms such as control chip, controllable silicon cannot carry out reverse-connection protection.
Application number is that 201410112524.X application for a patent for invention discloses a kind of leakage current detection protection circuit that has timer-controlled self-inspection and backing protection function concurrently; for realizing backing protection function and guaranteeing, in power input, power output end, power supply user side three, there are all the time both to keep conducting to be always two groups of conductors of mutually isolating; its circuit structure is also provided with normally closed switch (K3B-1, KR3B-2) etc. except major loop switch; structure is more complicated; assembly precision requires high, comparatively wastes time and energy.
Summary of the invention
Goal of the invention of the present invention is, for the deficiencies in the prior art place, to provide a kind of leakage current detection protection circuit.
The technical solution used in the present invention is:
Leakage current detection protection circuit, comprise power input, power supply user side, power output end, reset button, two induction coil T1 for detection of leakage current and low resistance fault, T2, by magnetic fields, drive built-in iron core cooperative mechanical structure to make reset button drive major loop switch closure/tripping coil L1 disconnecting and the control chip IC1 that controls tripping coil current supply circuit break-make by two induction coil testing results, power input and power output end are respectively drawn a pair of fixed contact, power supply user side is drawn a pair of moving contact, moving contact comprises flexible wire and the moving contact lever of drawing from power supply user side, moving contact lever two ends respectively arrange a contact, moving contact lever can be done seesaw movements and make fixed contact contact that fixed contact that two terminal contacts draw with power input respectively and power output end draw or separated, moving contact lever also has flexible restoring organ, when reset button resets, moving contact lever one end does not contact with the fixed contact of being drawn by power output end power output end and power supply user side is connected as a single entity, the fixed contact that during false wiring, moving contact lever is automatically drawn the other end of moving contact lever under flexible restoring organ effect with power input contacts power input and power supply user side is connected as a single entity.
Further, the the second tripping coil L2 and one that makes power output end and power supply user side disconnect while being also included in reverse wiring is connected between power output end two-phase and is used to the second tripping coil that the normally closed switch K5 of path is provided, and normally closed switch K5 and reset button link and disconnect when resetting successfully.
Further, also comprise timer-controlled self-inspection circuit, timer-controlled self-inspection circuit comprises self check chip IC 2, self check path controllable silicon SCR and self check leakage current generating resistance R 16, and self check chip IC 2, self check path controllable silicon SCR and self check leakage current generating resistance R 16 form the self check loop through two induction coil T1, T2 with power input.
Further, described timer-controlled self-inspection circuit also comprises rectifying bridge type circuit, and rectifying bridge type circuit two inputs cause respectively the two-phase of power input, between rectifying bridge type circuit two inputs, is connected with piezo-resistance MOV.
Preferably, one of rectifying bridge type circuit input end is not connected through the part of two induction coils with power input live wire end through resistance R 19, and another input of rectifying bridge type circuit is not connected through the part of two induction coils with power input zero line side.
Further, the anode of self check path controllable silicon SCR is connected with the live wire end of power input through two induction coils through self check leakage current generating resistance R 16, the minus earth of self check path controllable silicon SCR, and control end is connected with self check chip IC 2 outputs.
As another preferred version, one of described rectifying bridge type circuit input end is connected with the part of power input live wire end through two induction coils through resistance R 19, and another input of rectifying bridge type circuit is connected with the part of power input zero line side through two induction coils.
Further, the anode of self check path controllable silicon SCR is not connected through the live wire end of two induction coils with power input through self check leakage current generating resistance R 16, the minus earth of self check path controllable silicon SCR, and control end is connected with self check chip IC 2 outputs.
Further, also comprise simulation leakage current generating resistance R 4, the simulation leakage current loop that simulation leakage current generating resistance R 4 forms through two induction coil T1, T2 through reset button K switch 7.
Further, also comprise testing button TEST, testing button K switch 6 one end are connected with one of power input through simulation leakage current generating resistance R 4, and the other end is connected with another in power supply user side.
Beneficial effect of the present invention is: power supply user side is drawn pair of flexible wire and the moving contact lever of moving seesaw-type, major loop switch and diverter switch are combined as a whole, guarantee that power input, power supply user side and power output end reduce element when being formed by two pairs of conductors all the time, save man-hour, reduce costs; The second tripping coil is set and carries out reverse-connection protection, still can deenergization output and power input during end-of-life, improve fail safe; Save simulation leakage current generating switch and directly by reset button, press action short circuit; Save timer-controlled self-inspection circuit switching, simple in structure, save installing space; False wiring can stop reset naturally, automatically guides the function of correct wiring, simultaneously the power supply raising contact useful life of tripping operation energy fast shut-off user side and output
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the embodiment of the present invention 1.
Fig. 2 is the circuit diagram of the embodiment of the present invention 2.
 
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
embodiment 1
With reference to Fig. 1, the leakage current detection protection circuit of the present embodiment, comprise power input, power supply user side, power output end, reset button, two induction coil T1 for detection of leakage current and low resistance fault, T2, by magnetic fields, drive built-in iron core cooperative mechanical structure to make reset button drive major loop switch closure/tripping coil L1 disconnecting and the control chip IC1 that controls tripping coil current supply circuit break-make by two induction coil testing results, power input and power output end are respectively drawn a pair of fixed contact, power supply user side is drawn a pair of moving contact, moving contact comprises the flexible wire (3 of drawing from power supply user side, 4) and moving contact lever (1, 2), moving contact lever (1, 2) two ends respectively arrange a contact, moving contact lever can be done seesaw movements and make fixed contact contact that fixed contact that two terminal contacts draw with power input respectively and power output end draw or separated, moving contact lever also has flexible restoring organ, when reset button resets, moving contact lever one end does not contact with the fixed contact of being drawn by power output end and makes power output end and power supply user side (the major loop K switch R1-1 that is connected as a single entity, KR2-2 disconnects), the fixed contact that during false wiring, moving contact lever is automatically drawn the other end of moving contact lever under flexible restoring organ effect with power input contacts and makes power input and power supply user side (the major loop K switch R1-1 that is connected as a single entity, KR2-2 is closed).Moving contact lever can arrange at middle part rotary support point, also can be arranged on additional insulating part, and moving contact lever is followed insulating part and done seesaw movements.
The the second tripping coil L2 and one that makes power output end and power supply user side disconnect while being also included in reverse wiring for the leakage current detection protection circuit of embodiment is connected in the normally closed switch K5 that is used to the second tripping coil that path is provided between power output end two-phase, normally closed switch K5 and reset button interlock and disconnection when resetting successfully.
For timely checking circuit function whether intact, also comprise timer-controlled self-inspection circuit, timer-controlled self-inspection circuit comprises self check chip IC 2, self check path controllable silicon SCR and self check leakage current generating resistance R 16, and self check chip IC 2, self check path controllable silicon SCR and self check leakage current generating resistance R 16 form the self check loop through two induction coils (T1, T2) with power input.
Timer-controlled self-inspection circuit also comprises rectifying bridge type circuit, and rectifying bridge type circuit two inputs cause respectively the two-phase of power input, between rectifying bridge type circuit two inputs, is connected with piezo-resistance MOV.
In the present embodiment, one of rectifying bridge type circuit input end is not connected through the part of two induction coils with power input live wire end through resistance R 19, and another input of rectifying bridge type circuit is not connected through the part of two induction coils with power input zero line side.
The anode of self check path controllable silicon SCR is connected with the live wire end of power input through two induction coils through self check leakage current generating resistance R 16, the minus earth of self check path controllable silicon SCR, and control end is connected with self check chip IC 2 outputs.
Also comprise simulation leakage current generating resistance R 4, the simulation leakage current loop that simulation leakage current generating resistance R 4 forms through two induction coils (T1, T2) through reset button K switch 7.
Also comprise testing button TEST, testing button K switch 6 one end are connected with one of power input through simulation leakage current generating resistance R 4, and the other end is connected with another in power supply user side.
embodiment 2
Shown in Fig. 2, in the present embodiment, one of rectifying bridge type circuit input end is connected with the part of power input live wire end through two induction coils through resistance R 19, and another input of rectifying bridge type circuit is connected with the part of power input zero line side through two induction coils.
The anode of self check path controllable silicon SCR is not connected through the live wire end of two induction coils with power input through self check leakage current generating resistance R 16, the minus earth of self check path controllable silicon SCR, and control end is connected with self check chip IC 2 outputs.
 
Although the present invention illustrates and describes by reference to preferred embodiment,, those of ordinary skills should understand, and can be not limited to the description of above-described embodiment, in the scope of claims, can do the various variations in form and details.

Claims (10)

1. leakage current detection protection circuit, comprise power input, power supply user side, power output end, reset button, two induction coil (T1 for detection of leakage current and low resistance fault, T2), by magnetic fields, drive built-in iron core cooperative mechanical structure to make reset button drive major loop switch closure/tripping coil (L1) disconnecting and the control chip (IC1) of controlling tripping coil current supply circuit break-make by two induction coil testing results, it is characterized in that: power input and power output end are respectively drawn a pair of fixed contact, power supply user side is drawn a pair of moving contact, moving contact comprises flexible wire and the moving contact lever of drawing from power supply user side, moving contact lever two ends respectively arrange a contact, moving contact lever can be done seesaw movements and make fixed contact contact that fixed contact that two terminal contacts draw with power input respectively and power output end draw or separated, moving contact lever also has flexible restoring organ, when reset button resets, moving contact lever one end does not contact with the fixed contact of being drawn by power output end power output end and power supply user side is connected as a single entity, the fixed contact that during false wiring, moving contact lever is automatically drawn the other end of moving contact lever under flexible restoring organ effect with power input contacts power input and power supply user side is connected as a single entity.
2. leakage current detection protection circuit according to claim 1; it is characterized in that: the second tripping coil (L2) and that makes power output end and power supply user side disconnect while being also included in reverse wiring is connected between power output end two-phase and is used to the second tripping coil that the normally closed switch (K5) of path is provided, and normally closed switch (K5) links with reset button and disconnects when resetting successfully.
3. leakage current detection protection circuit according to claim 1; it is characterized in that: also comprise timer-controlled self-inspection circuit; timer-controlled self-inspection circuit comprises self check chip (IC2), self check path controllable silicon (SCR) and self check leakage current generating resistance (R16), and self check chip (IC2), self check path controllable silicon (SCR) and self check leakage current generating resistance (R16) form the self check loop through two induction coils (T1, T2) with power input.
4. leakage current detection protection circuit according to claim 3; it is characterized in that: described timer-controlled self-inspection circuit also comprises rectifying bridge type circuit; rectifying bridge type circuit two inputs cause respectively the two-phase of power input, are connected with piezo-resistance (MOV) between rectifying bridge type circuit two inputs.
5. leakage current detection protection circuit according to claim 4; it is characterized in that: one of rectifying bridge type circuit input end is not connected through the part of two induction coils with power input live wire end through resistance (R19), another input of rectifying bridge type circuit is not connected through the part of two induction coils with power input zero line side.
6. leakage current detection protection circuit according to claim 5; it is characterized in that: the anode of self check path controllable silicon (SCR) is connected with the live wire end of power input through two induction coils through self check leakage current generating resistance (R16); the minus earth of self check path controllable silicon (SCR), control end is connected with self check chip (IC2) output.
7. leakage current detection protection circuit according to claim 4; it is characterized in that: one of described rectifying bridge type circuit input end is connected with the part of power input live wire end through two induction coils through resistance (R19), another input of rectifying bridge type circuit is connected with the part of power input zero line side through two induction coils.
8. leakage current detection protection circuit according to claim 7; it is characterized in that: the anode of self check path controllable silicon (SCR) is not connected through the live wire end of two induction coils with power input through self check leakage current generating resistance (R16); the minus earth of self check path controllable silicon (SCR), control end is connected with self check chip (IC2) output.
9. leakage current detection protection circuit according to claim 1; it is characterized in that: also comprise simulation leakage current generating resistance (R4), simulation leakage current generating resistance (R4) forms the simulation leakage current loop through two induction coils (T1, T2) through reset button switch (K7).
10. leakage current detection protection circuit according to claim 9; it is characterized in that: also comprise testing button (TEST); testing button switch (K6) one end is connected with one of power input through simulation leakage current generating resistance (R4), and the other end is connected with another in power supply user side.
CN201410367800.7A 2014-07-30 2014-07-30 Electric leakage detection protection circuit Pending CN104143812A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410367800.7A CN104143812A (en) 2014-07-30 2014-07-30 Electric leakage detection protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410367800.7A CN104143812A (en) 2014-07-30 2014-07-30 Electric leakage detection protection circuit

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104393564A (en) * 2014-11-20 2015-03-04 黄金和 Electric leakage detection protective circuit with timed self-checking function
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

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2741232Y (en) * 2005-04-15 2005-11-16 黄华道 Electromagnetic leakage preventing socket
CN101047294A (en) * 2006-03-31 2007-10-03 黄华道 Leakage protection socket
CN101227044A (en) * 2007-01-17 2008-07-23 黄华道 New type electric leakageproof socket
CN101399418A (en) * 2007-09-30 2009-04-01 黄华道 Novel leakage protection socket
CN101478099A (en) * 2008-01-04 2009-07-08 创奇科技有限公司 Neutral grounding fault creepage protecting plug
CN102237614A (en) * 2010-04-22 2011-11-09 黄华道 Electricity leakage protection socket

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2741232Y (en) * 2005-04-15 2005-11-16 黄华道 Electromagnetic leakage preventing socket
CN101047294A (en) * 2006-03-31 2007-10-03 黄华道 Leakage protection socket
CN101227044A (en) * 2007-01-17 2008-07-23 黄华道 New type electric leakageproof socket
CN101399418A (en) * 2007-09-30 2009-04-01 黄华道 Novel leakage protection socket
CN101478099A (en) * 2008-01-04 2009-07-08 创奇科技有限公司 Neutral grounding fault creepage protecting plug
CN102237614A (en) * 2010-04-22 2011-11-09 黄华道 Electricity leakage protection socket

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104393564A (en) * 2014-11-20 2015-03-04 黄金和 Electric leakage detection protective circuit with timed self-checking function
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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Application publication date: 20141112