CN104577971B - Power off trip protection plug - Google Patents

Power off trip protection plug Download PDF

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Publication number
CN104577971B
CN104577971B CN201410827258.9A CN201410827258A CN104577971B CN 104577971 B CN104577971 B CN 104577971B CN 201410827258 A CN201410827258 A CN 201410827258A CN 104577971 B CN104577971 B CN 104577971B
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diode
protection
circuit
ground wire
electric capacity
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CN104577971A (en
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钱加灿
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Yuyao Jiarong Electronic Appliance Co Ltd
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Yuyao Jiarong Electronic Appliance Co Ltd
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Abstract

The present invention discloses a kind of power-off trip protection plug; including amplifying circuit, electrical apparatus release, overtemperature detection circuit, commutation diode, power supply instruction circuit for lamp, reduction voltage circuit, controllable silicon, zero sequence current mutual inductor and ground line current transformer, open-phase protection circuit is additionally provided with;The open-phase protection circuit includes magnet coil, anti-backflow diode, storage capacitor, the first diode and the protection diode of electrical apparatus release; the storage capacitor positive pole connection anti-backflow diode and magnet coil; the protection diode negative pole connects storage capacitor positive pole; protection diode positive pole connects the other end of magnet coil, and first diode is connected between controllable silicon and magnet coil.The present invention realizes open-phase protection (containing L, N, E are in contact bad), ground wire open circuit protection and wall electrization protection.

Description

Power off trip protection plug
Technical field
The present invention relates to Electrical Safety protection technique field, more particularly, to power-off trip protection plug.
Background technology
Existing electric leakage protection technology is mainly zero line (N), and phase line (L) does earth leakage protective entirely also cross zero-sequence mutual inductance line Device is used, and ground wire electrified detection (voltage detecting and current detecting), and such technology is established to be had to last in supply voltage Corresponding defencive function can be provided on the basis of power supply, if just being met when zero-line open-circuit or the loose contact of electric power system When ground wire electrification or machine insulation occur abnormal, protector disconnects system can not reset dropout, ground strip caused by mechanical self-latching Piezoelectric voltage or leakage current because of insulation damages make machine powered, if human body causes electric shock behavior after touching, to solve such confession Electrical anomaly phenomenon, in the market also occurs powering off trip protection device, because such protector is to be held magnet coil by electric power system Continuous adhesive, makes tripping mechanism contact closure reach continued power purpose, and when electric power system power-off or phase shortage, magnet coil is because of nothing Method adhesive cause protector can not powering load reach protection philosophy, the drawback of the protected mode is:Magnet coil continues Power supply causes coil heating, and serious heating for a long time influences protector service life and potential safety hazard be present, is protected under extreme condition Shield device will lose defencive function and cause serious consequence.
The content of the invention
(1) technical problems to be solved
Present invention aim to overcome disadvantages mentioned above, it is desirable to provide one kind power-off trip protection plug.
(2) technical scheme
To solve the above problems, the present invention proposes a kind of power-off trip protection plug, including it is amplifying circuit, electrical apparatus release, super Temperature detector slowdown monitoring circuit, commutation diode, power supply instruction circuit for lamp, reduction voltage circuit, controllable silicon, zero sequence current mutual inductor and ground line current Transformer, it is additionally provided with open-phase protection circuit;
The open-phase protection circuit includes magnet coil, anti-backflow diode, storage capacitor, the first diode of electrical apparatus release And protection diode, the storage capacitor positive pole connection anti-backflow diode and magnet coil, the protection diode negative pole connect Storage capacitor positive pole is connect, protection diode positive pole connects the other end of magnet coil, and first diode is connected to controllable silicon Between magnet coil;
Wall and ground wire protection circuit are additionally provided between ground wire and wall.
Further, wall and the ground wire protection circuit includes the first electric capacity, the second electric capacity, the second diode, triode With the first protective resistance, the first electric capacity one end connection ground wire, the other end connect the second diode cathode and the second electric capacity, institute State the other end connecting wall of the second electric capacity, the base that the negative pole of second diode passes through the first protective resistance connecting triode Pole.
Further, wall and the ground wire protection circuit includes the 3rd electric capacity, the 4th electric capacity, ground wire voltage transformer and turned Switch, described 3rd electric capacity one end connecting wall are changed, the other end connects one end and the ground wire voltage transformer primary of the 4th electric capacity Coil, the other end connection ground wire of the 4th electric capacity, the ground wire voltage transformer and ground line current transformer pass through conversion Switch mutually switching.
Further, ground wire electrification indicating circuit is provided between the ground wire and zero line.
Further, the primary coil of the zero sequence current mutual inductor is additionally provided with test circuit.
(3) beneficial effect
Compared with prior art, the present invention has advantages below:1 open-phase protection (contains L, N, E are in contact bad), energization shape Protector under state, during because of L or N-terminal power failure or loose contact, detection transistor Q3 cut-offs, electric capacity C5 tank voltages are through electricity R12 is hindered, diode D6 to controllable silicon SCR 1 is turned on, magnet coil adhesive, the release of mechanical self-latching contact, cuts off load supplying;2 open Road is protected, and under "on" position, is grounded E, when Eo ends are opened a way, induced voltage on E lines through electric capacity C4, diode D3, resistance R6, Triode Q2, triode Q1, diode D7 are released to controllable silicon SCR 1, controlled silicon conducting, magnet coil adhesive, mechanical self-latching contact Put, cut off load supplying;3 wall electrization protection "on" positions, E ends are no ground, are grounded Ee ends or Eo ends are powered, powered electric current Resistance D7, SCR1 controlled silicon conducting, magnet coil adhesive, the release of mechanical self-latching contact, cut-out load are delivered to after amplifying after testing Power supply.
Brief description of the drawings
Fig. 1 is the circuit theory schematic diagram of the embodiment one of the power-off trip protection plug of the present invention;
Fig. 2 is the circuit theory schematic diagram of the embodiment two of the power-off trip protection plug of the present invention.
Embodiment
With reference to the accompanying drawings and examples, the embodiment of the present invention is described in further detail.Implement below Example is used to illustrate the present invention, but is not limited to the scope of the present invention.
Embodiment one
As shown in figure 1, the present invention proposes a kind of power-off trip protection plug, including amplifying circuit IC1, electrical apparatus release, overtemperature Detection circuit, commutation diode D1, power supply instruction circuit for lamp, reduction voltage circuit are made up of resistance R4, controllable silicon SCR 1, zero-sequence current Transformer ZCT1 and ground line current transformer ZCT3, wherein, Overtemperature protection circuit is by voltage-reference, triode Q1, resistance R7 Formed to resistance R9 and thermistor, power supply instruction circuit for lamp is composed in series by LED1 and resistance R3, is additionally provided with open-phase protection Circuit;
Magnet coil L1 of the open-phase protection circuit including electrical apparatus release, anti-backflow diode D4, storage capacitor C5, first Diode D6 and protection diode D5, storage capacitor C5 positive poles connection anti-backflow diode D4 and the magnet coil L1, it is described Protection diode D5 negative poles connect storage capacitor C5 positive poles, the protection diode D5 positive poles connection magnet coil L1 other end, institute The first diode D6 is stated to be connected between controllable silicon SCR 1 and magnet coil L1;
Wall and ground wire protection circuit are additionally provided between ground wire E and wall Ee.
Wall and the ground wire protection circuit includes the first electric capacity C4, the second electric capacity C3, the second diode D3, triode Q2 With the first protective resistance R6, the first electric capacity C4 one end connection ground wire E, other end connection the second diode D3 positive poles and second Electric capacity C3, the second electric capacity C3 other end connecting wall Ee, the second diode D3 negative pole pass through the first protection electricity Hinder R6 connecting triodes Q2 base stage.
Be provided with ground wire electrification indicating circuit between the ground wire E and zero line N, the ground wire electrification indicating circuit by electric capacity C1, Resistance R1, neon lamp X1 are formed.
The primary coil of the zero sequence current mutual inductor ZCT1 is additionally provided with test circuit, electric routing switch K1, resistance R2 Composition.
The operation principle of the circuit is as follows:
1 load zero, phase line earth leakage protective
After protector plug access 220V input powers, pressure is by return unit switch S1, S2 closure, and work 1 point of indication LED Bright, supply voltage charges through D1 rectifications, D4 reverse isolations to C5 capacitors, and C5 terminal voltages are supplied to controllable after protecting coil L1 Silicon SCR1, controllable silicon obtain electricity and in protection detection states;At the same time, electric current is through resistance R4 current limlitings, and C2 capacitor filterings are to IC1 Power supply, protector obtain electricity work (this process hereinafter referred:Protector obtains electric work);When load end (output end) Lo or No is any During the output electric leakage of end, the 1 and 2 of IC1 detection drive circuits is sent into mutual inductor ZCT1 output induced voltages, one end after ZCT3 Pin, when leakage current reaches preset value, 7 pin export high level through D2, D7 to control machines pole, controlled silicon conducting, C5 ends Voltage instantaneous is applied to L1 magnet coils both ends, and coil adhesive drives tripping mechanism to disconnect closure contact (S2, S1), and cut-out is negative Carry power supply and play a part of safeguard protection;
2 earth wire charged protectings (E ends)
Protector obtains electric work, and ground wire electrification electric current flows out Eo ends through E, and it is through the induction coil ZCT3 outputs on E lines Induced voltage, deliver to IC1 1 and 2 pin respectively after ZCT1 all the way, when leakage current reaches preset value, IC1 7 pin output For high level through D2, D7 delivers to SCR1 trigger electrodes, controlled silicon conducting, and C5 terminal voltage moments are applied to L1 magnet coils both ends, coil Adhesive drives tripping mechanism to disconnect closure contact (S2, S1), and cut-out load power source plays a part of safeguard protection;
3 open-phase protections (L or N phase shortages)
Protector obtains electric work, as power supply L or N-terminal open circuit or loose contact (interruption of power supply of input containing AC220V), C2 terminal voltages are not enough to maintain Q3 conductings, and after Q3 cut-offs, C5 terminal voltages are through R12, and D6 delivers to SCR1 trigger electrodes, controlled silicon conducting, C5 terminal voltage moments are applied to L1 magnet coils both ends, and coil adhesive drives tripping mechanism to disconnect closure contact (S2, S1), cut Disconnected load power source plays a part of safeguard protection;
4 open-phase protections (E, Eo phase shortage)
Protector obtains electric work, when power E and Eo ends open circuit when, there will be induced voltage on E ends, the voltage through C4, D3, R6 delivers to Q2 and turned on, the controlled conductings of Q1, and supply voltage triggers SCR1, controlled silicon conducting, C5 terminal voltage winks after Q1 is sent to D7 Between be applied to L1 magnet coils both ends, coil adhesive drives tripping mechanism to disconnect closure contact (S2, S1), cuts off load power source Play a part of safeguard protection;
5 wall electrization protections (Ee ends)
Protector obtains electric work, and input x1 wire jumpers are predisposed to open-circuit condition, x2 short circuit states, wall electrified voltage Ee warps C3, D3, R6 deliver to Q2 and turned on, and the controlled conductings of Q1, supply voltage triggers SCR1, controlled silicon conducting, C5 ends after Q1 is sent to D7 Voltage instantaneous is applied to L1 magnet coils both ends, and coil adhesive drives tripping mechanism to disconnect closure contact (S2, S1), and cut-out is negative Load power supply plays a part of safeguard protection, and powered warning lamp X1 is lighted simultaneously;
6 protector plug overtemperature protes
Protector obtains electric work, when overtemperature protection device detects that protector plug temperature reaches preset temperature, C2 voltages Through R9, RT1 delivers to U1, and the conducting of U1 depth causes Q1 to turn on, and conducting electric current triggers SCR1, controlled silicon conducting, C5 ends electricity after D7 Pressure moment is applied to L1 magnet coils both ends, and coil adhesive drives tripping mechanism to disconnect closure contact (S2, S1), cut-out load Power supply plays a part of safeguard protection.
The present invention has advantages below:1 open-phase protection (contains L, N, E are in contact bad), the protector under "on" position, because L or when N-terminal power failure or loose contact, detection transistor Q3 cut-offs, electric capacity C5 tank voltages are through resistance R12, diode D6 Turned on to controllable silicon SCR 1, magnet coil adhesive, the release of mechanical self-latching contact, cut off load supplying;2 open-circuit-protections, energization shape Under state, E is grounded, when Eo ends are opened a way, the induced voltage on E lines is through electric capacity C4, diode D3, resistance R6, triode Q2, three poles Pipe Q1, diode D7 are to controllable silicon SCR 1, and controlled silicon conducting, magnet coil adhesive, the release of mechanical self-latching contact, cut-out, which loads, to supply Electricity;3 wall electrization protection "on" positions, E ends are no ground, are grounded Ee ends or Eo ends are powered, after powered electric current amplifies after testing Resistance D7, SCR1 controlled silicon conducting is delivered to, magnet coil adhesive, the release of mechanical self-latching contact, cuts off load supplying.
Embodiment two
The structure of the present embodiment and embodiment one is essentially identical, and difference is as shown in Figure 2:The wall and ground wire are protected Protection circuit includes the 3rd electric capacity C3, the 4th electric capacity C4, ground wire voltage transformer ZCT2 and change-over switch S3, the 3rd electric capacity C3 One end connecting wall Ee, the other end connect the 4th electric capacity C4 one end and ground wire voltage transformer ZCT2 primary coils, and described the The four electric capacity C4 other end connection ground wire E, ground wire voltage transformer ZCT2 and ground line current the transformer ZCT3 passes through conversion Switch S3 mutually switches.Open-phase protection (L or N phase shortages) process of the present embodiment is as follows:Protector obtains electric work, as power supply L or N When end open circuit or loose contact (interruption of power supply of input containing AC220V), C2 terminal voltages are not enough to maintain Q3 conductings, after Q3 cut-offs, For C5 terminal voltages through R12, D6 delivers to SCR1 trigger electrodes, controlled silicon conducting, and C5 terminal voltage moments are applied to L1 magnet coils both ends, line Circle adhesive drives tripping mechanism to disconnect closure contact (S2, S1), and cut-out load power source plays a part of safeguard protection.Phase shortage is protected The following protector of shield (E, Eo phase shortage) obtains electric work, and when E the and Eo ends that power are opened a way, there will be induced voltage, the voltage on E ends Through C4, ZCT2, R5 and N-terminal form loop, and ZCT2 inductive outputs voltage is sent into the 1 and 2 of IC1 after S3 switches switch and ZCT1 Pin, 7 pin export high level after IC1 enhanced processings, and SCR1, controlled silicon conducting, C5 terminal voltage moments are triggered after D2 is sent to D7 L1 magnet coils both ends are applied to, coil adhesive drives tripping mechanism to disconnect closure contact (S2, S1), and cut-out load power source rises To the effect of safeguard protection.
It the above is only the preferred embodiment of the present invention, it is noted that come for those skilled in the art Say, without departing from the technical principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (4)

1. one kind power-off trip protection plug, including amplifying circuit, electrical apparatus release, overtemperature detection circuit, commutation diode D1, power supply Indicator light circuit, reduction voltage circuit, controllable silicon SCR 1, zero sequence current mutual inductor ZCT1 and ground line current transformer, it is characterised in that: It is additionally provided with open-phase protection circuit;
Magnet coil L1 of the open-phase protection circuit including electrical apparatus release, anti-backflow diode D4, storage capacitor C5, the one or two pole Pipe D6 and protection diode D5, the storage capacitor C5 positive poles connect anti-backflow diode D4 and magnet coil L1, the protection Diode D5 negative poles connect storage capacitor C5 positive poles, the protection diode D5 positive poles connection magnet coil L1 other end, and described the One diode D6 is connected between controllable silicon SCR 1 and magnet coil L1;
Wall and ground wire E protection circuits are additionally provided between ground wire E and wall;
Wall and the ground wire protection circuit includes the first electric capacity C4, the second electric capacity C3, the second diode D3, triode Q2 and the One protective resistance R6, the first electric capacity C4 one end connection ground wire E, the other end connect the second diode D3 positive poles and the second electric capacity C3, the other end connecting wall of the second electric capacity C3, the negative pole of the second diode D3 are connected by the first protective resistance R6 Connect triode Q2 base stage;
Also include storage capacitor C2, triode Q3, wherein, storage capacitor C2 positive poles are electrically connected with triode Q3 base stages; When live wire L or zero line N-terminal open circuit or loose contact, storage capacitor C2 undertensions are to maintain triode Q3 to turn on, triode Q3 After cut-off, storage capacitor C5 terminal voltages deliver to the trigger electrode of controllable silicon SCR 1, and controllable silicon SCR 1 turns on, storage capacitor C5 terminal voltage winks Between be applied on magnet coil L1, act electrical apparatus release, cut-out load power source play safeguard protection effect.
2. power-off trip protection plug according to claim 1, it is characterised in that:Wall and ground wire the protection circuit bag Include the 3rd electric capacity, the 4th electric capacity, ground wire voltage transformer and change-over switch, described 3rd electric capacity one end connecting wall, the other end One end and the ground wire voltage primary winding of mutual inductor of the 4th electric capacity are connected, the other end of the 4th electric capacity connects ground wire E, described Ground wire voltage transformer and ground line current transformer are mutually switched by change-over switch.
3. power-off trip protection plug according to claim 1, it is characterised in that:It is provided between the ground wire E and zero line N Ground wire E electrification indicating circuits.
4. power-off trip protection plug according to claim 3, it is characterised in that:The zero sequence current mutual inductor ZCT1's Primary coil is additionally provided with test circuit.
CN201410827258.9A 2014-12-26 2014-12-26 Power off trip protection plug Active CN104577971B (en)

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CN104979798B (en) * 2015-05-04 2017-11-03 余姚市嘉荣电子电器有限公司 Automatic identification omnibearing protection earth leakage protective device device
CN104917147B (en) * 2015-05-25 2018-04-13 余姚市嘉荣电子电器有限公司 Ground wire zero curve partial pressure sampling type earth leakage protective device
CN105207171B (en) * 2015-09-21 2018-02-06 余姚市嘉荣电子电器有限公司 Earth leakage protective device powers on/off control circuit automatically
TWI619360B (en) * 2016-11-10 2018-03-21 美律實業股份有限公司 Near field communication apparatus and wireless induction circuit thereof
CN107732862B (en) * 2017-10-20 2024-04-19 杨蔚星 Three-phase four-wire omnibearing multifunctional accident electric control protection switch
CN112865015B (en) * 2021-03-25 2022-06-24 江苏舒茨测控设备股份有限公司 Sensor with high-voltage zero-sequence protection and measurement functions

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CN201004548Y (en) * 2006-08-15 2008-01-09 陈成南 Current leakage protector with zero line breaking protection
CN101442199A (en) * 2008-09-05 2009-05-27 上海良信电器股份有限公司 Electronic breaker
CN203056535U (en) * 2013-02-07 2013-07-10 浙江南瑞电力自动化有限公司 Passive microcomputer protection device
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