CN102842889B - One is tape voltage protection with sensitivity - Google Patents

One is tape voltage protection with sensitivity Download PDF

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Publication number
CN102842889B
CN102842889B CN201210287915.6A CN201210287915A CN102842889B CN 102842889 B CN102842889 B CN 102842889B CN 201210287915 A CN201210287915 A CN 201210287915A CN 102842889 B CN102842889 B CN 102842889B
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circuit
voltage
amplifying circuit
sensitivity
ground wire
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CN102842889A (en
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钱加灿
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钱加灿
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Abstract

One is tape voltage protection with sensitivity, comprise the phase line of each belt switch, zero line, ground wire, through phase line, the zero sequence current mutual inductor of zero line, hookup, first amplifying circuit, release, rectification circuit, power voltage step down, controllable silicon, first amplifying circuit working power is provided through power voltage step down circuit by power supply, a transformer and the second amplifying circuit are also set, second amplifying circuit comprises two amplifying circuits, primary coil one end of transformer is connected with the input of ground wire E, be connected with the input of zero line after the primary coil other end of transformer is connected in series large resistance current limliting reduction voltage circuit, the secondary coil of transformer is connected with the input of one of them amplifying circuit of the second amplifying circuit, the output difference series-opposing voltage isolation circuit of the second amplifying circuit two amplifying circuits is connected with silicon controlled trigger electrode, second amplifying circuit operating voltage is provided through voltage stabilizing circuit by power supply, the output of the first amplifying circuit is connected with silicon controlled trigger electrode.

Description

One is tape voltage protection with sensitivity
Technical field
The present invention relates to tape voltage protection with sensitivity.
Background technology
Existing band earth wire live protector, as all-purpose leakage protection plug, generally refer to and can be able to disconnect when electric leakage appears in phase zero line at protective device (plug), can disconnect when being also included within ground wire electrification, it generally comprises by the dynamic phase touched flexure strip and be connected with fixed contact, zero, three poles, ground, through phase, zero sequence current mutual inductor between zero line, test loop, amplifying circuit, rectifier, controllable silicon, release, through the zero sequence current mutual inductor of ground wire, it is except detecting load phase, with or without outside leakage current between zero line, whether also detect ground wire has leakage current to pass through, work as phase line, when there is leakage current respectively or simultaneously in zero line or ground wire, two magnetic test coils all can make release immediately by phase, zero, ground wire all disconnects, namely cut off the electricity supply, thus effectively ensured personal safety, therefore be widely applied in household electrical appliance.
The fail safe of ground wire electrification, validity is prevented in order to strengthen all-purpose leakage protection plug; the applicant develops the all-purpose leakage protection plug of multiple ground wire live trip in succession; add contact with alarm of charged ground wire circuit; by the detection mode such as neon lamp of multiple detection ground wire electrification and coordinating of light-sensitive element; warning can be produced when ground wire electrification; prompting user takes measures, and stops using electrical equipment, thus further increases the security performance of leakage protecting plug.
But above-mentioned all-purpose leakage protection plug can not adapt to various different service condition, needs for concrete service condition and carries out different exploitations.
Summary of the invention
Technical problem to be solved by this invention be overcome prior art above-mentioned defect and one tape voltage protection is with sensitivity provided, can cut off the electricity supply rapidly when ground wire electrification exceeds safe voltage.
The present invention solves the problems of the technologies described above adopted technical scheme: tape voltage protection with sensitivity, comprise the phase line L of each belt switch, zero line N, ground wire E tri-pole, through phase line L, the zero sequence current mutual inductor of zero line N, hookup, first amplifying circuit, release, rectification circuit, power voltage step down, controllable silicon, the working power of the first amplifying circuit is provided through power voltage step down circuit by power supply, it is characterized in that: a transformer and the second amplifying circuit are also set, second amplifying circuit comprises two amplifying circuits, primary coil one end of transformer is connected with the input of ground wire E, be connected with the input of zero line N after the primary coil other end of transformer is connected in series large resistance current limliting reduction voltage circuit, the secondary coil of transformer is connected with the input of one of them amplifying circuit of the second amplifying circuit, the output difference series-opposing voltage isolation circuit of two amplifying circuits of the second amplifying circuit is connected with silicon controlled trigger electrode, the operating voltage of the second amplifying circuit is provided through voltage stabilizing circuit by power supply, the output of the first amplifying circuit is connected with silicon controlled trigger electrode.
Better: the iron core of above-mentioned transformer is annular, and primary coil is around the side of annular core, and secondary coil, like this can be high pressure resistant around the opposite side of annular core.
Better: above-mentioned current-limiting circuit is insulation resistance or electric capacity.
Better: connect induced voltage between the input of above-mentioned zero line N, ground wire E and eliminate circuit.
Better: between the input of above-mentioned zero line N, ground wire E, connect ground wire electrification indicating circuit.
Compared with prior art, the invention has the advantages that: owing to arranging transformer between zero line and the input of ground wire, and by two the second amplifying circuits, make itself and the first amplifying circuit mutually unaffected, can guarantee that ground wire live trip voltage is not more than safe voltage.
Also eliminating circuit by connecting induced voltage between the input of zero line N, ground wire E, preventing because there being induced voltage to make the misoperation of tape voltage protection and false alarm with sensitivity in ground wire.
Accompanying drawing explanation
Fig. 1 is the circuit theory schematic diagram of the embodiment of the present invention.
Fig. 2 is the physical circuit schematic diagram of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
As shown in Figure 1; one is tape voltage protection with sensitivity; comprise the phase line L of belt switch K, zero line N; ground wire E tri-pole, through zero sequence current mutual inductor ZCT1, hookup, the first amplifying circuit IC1, release, rectification circuit, power voltage step down, controllable silicon SCR, the transformer ZCT2 of phase line L, zero line N.
Two ends after primary coil one end of transformer ZCT2 is connected in series large resistance current limliting reduction voltage circuit are connected with the input of zero line N, ground wire E, and the secondary coil of instrument transformer ZCT2 is connected with the input of the second amplifying circuit IC2.
The operating voltage of the first amplifying circuit IC1 is provided through power voltage step down circuit after rectifier circuit rectifies by power supply again, the output of zero sequence current mutual inductor ZCT1 connects the input of the first amplifying circuit IC1, and the output of the first amplifying circuit IC1 is connected with the trigger electrode of thyristor gating circuit SCR.
Second amplifying circuit has independently IC2 stabilized voltage power supply, second amplifying circuit comprises two amplifying circuit IC2-1 amplifying circuits and IC2-2 amplifying circuit, the output of IC2-1 amplifying circuit is connected with the trigger electrode of controllable silicon SCR with series-opposing voltage isolation circuit respectively with IC2-2 amplification circuit output end, is connected after the output of the first amplifying circuit IC1 is also connected in series a reverse voltage buffer circuit with the trigger electrode of thyristor gating circuit SCR.
Overtemperature sensing element is also set, after arbitrary amplifying circuit amplification of its output signal input second amplifying circuit, triggers controllable silicon again.
Pin overtemperature sensing element input IC2-2 amplifying circuit in embodiment, when pin overtemperature, pin overtemperature sensing element resistance is little, triggers and disconnect tape voltage protection with sensitivity after amplifying circuit amplifies.
Connect induced voltage between the input of above-mentioned zero line N, ground wire E and eliminate circuit.
Ground wire electrification indicating circuit is connected between the input of above-mentioned zero line N, ground wire E.
Specific embodiment as shown in Figure 2; phase line L, the zero line N of belt switch K, ground wire E tri-pole; be original circuit for electric leakage protector through the zero sequence current mutual inductor ZCT of phase line L, zero line N, hookup R3, AN, the first amplifying circuit IC1, release, rectification circuit DC, power voltage step down circuit R4, controllable silicon SCR, in original leakage protection circuit, increase by the second amplifying circuit IC2, transformer ZCT2, dropping resistor R1, R2, an induced voltage eliminate electric capacity C1, band electric alarm neon bulb H.
First amplifying circuit IC1 is connected with controllable silicon SCR trigger electrode.
The secondary coil of transformer ZCT2 increased is connected with the input of the second amplifying circuit IC2-1 amplifying circuit, primary coil one end of transformer ZCT2 connect a large resistance resistance R2 after be attempted by the input of zero line N, ground wire E.
Two amplifying circuit IC2-1 amplifying circuits of the second amplifying circuit IC2 increased respectively are connected in series diode D1, a D2 as reverse voltage buffer circuit with IC2-2 amplification circuit output end and are connected with controllable silicon SCR trigger electrode, the positive pole of diode D1, D2 is connected with the output of the first amplifying circuit IC1, the second amplifying circuit IC2, the negative pole of diode D1, D2 is connected with the trigger electrode of controllable silicon SCR, shunt capacitance C2 between control machines pole and negative pole.
Resistance R5 and voltage-stabiliser tube D3 forms voltage stabilizing circuit, provides the working power of the second amplifying circuit.
Also arrange thermistor RT, it is in parallel with voltage-stabiliser tube D3 after connecting with shunt resistance R6, and one end that thermistor RT is connected with shunt resistance R6 is accessed in the second amplifying circuit IC2-2.
The resistance of above-mentioned resistance R2 should make circuit meet insulating requirements.
Above-mentioned resistance R2 also available capacity replaces.
As ground wire electrification indicating circuit between the input being connected on above-mentioned zero line N, ground wire E after neon bulb H, current limliting dropping resistor R1 series connection, neon bulb H will be lighted when ground strip piezoelectric voltage reaches neon bulb H ignition voltage, represent that ground wire is charged, can user be warned.If zero line N and live wire L connects instead, and ground wire E and ground not exclusively insulate, and also can produce voltage and make earth leakage protective device tripping operation and neon bulb light warning, avoid zero line N and live wire L to connect instead, under wiring normality lack of standardization, make electrical appliance between zero line N, ground wire E.
Connect electric capacity C1 between the input of above-mentioned zero line N, ground wire E and do induced voltage elimination circuit, electric capacity C1 utilizes alternating current can the principle of conducting, ground wire E can be eliminated and do not enter ground and the induced voltage that produces on ground wire E, thus mistrip and false alarm can not be caused.
When ground wire E is charged; just voltage is had between zero line N and ground wire E; being connected in the primary coil of the transformer ZCT2 between zero line N and ground wire E just has electric current to flow through; the secondary coil of ground wire voltage detection instrument transformer ZCT2 can induce voltage and after the second amplifying circuit IC2 amplifies, triggers controlled silicon conducting through diode D2 to controllable silicon SCR trigger electrode and make release dropout tripping operation, thus makes earth leakage protective device power-off.Voltage now between zero line N and ground wire E reaches neon bulb H ignition voltage, and the neon bulb H be connected between zero line N and ground wire E will be lit, and expression ground wire E is charged and report to the police.
Diode D1, D2 are the principles utilizing its one-way conduction, making two amplifying circuit IC2-1, IC2-2 outputs mutually isolated, output voltage can not being caused by shunting to be affected the trigger current of controllable silicon SCR.
Above-mentioned electric capacity C2 can improve antijamming capability.
Above-mentioned transformer, through number of turn proportioning that is first, secondary coil, trips more than just making release during 36V safe voltage at ground wire voltage.

Claims (10)

1. a tape voltage protection with sensitivity, comprise the phase line L of each belt switch, zero line N, ground wire E tri-pole, through phase line L, the zero sequence current mutual inductor of zero line N, hookup, first amplifying circuit, release, rectification circuit, power voltage step down circuit, controllable silicon, the working power of the first amplifying circuit is provided through power voltage step down circuit by power supply, it is characterized in that: a transformer and the second amplifying circuit are also set, second amplifying circuit comprises two amplifying circuits, primary coil one end of transformer is connected with the input of ground wire E, be connected with the input of zero line N after the primary coil other end of transformer is connected in series large resistance current limliting reduction voltage circuit, the secondary coil of transformer is connected with the input of one of them amplifying circuit of the second amplifying circuit, the output difference series-opposing voltage isolation circuit of two amplifying circuits of the second amplifying circuit is connected with silicon controlled trigger electrode, the operating voltage of the second amplifying circuit is provided through voltage stabilizing circuit by power supply, the output of the first amplifying circuit is connected with silicon controlled trigger electrode.
2. tape voltage protection with sensitivity as claimed in claim 1, is characterized in that: described large resistance current limliting reduction voltage circuit is insulation resistance or electric capacity.
3. tape voltage protection with sensitivity as claimed in claim 1 or 2, is characterized in that: the iron core of described transformer is annular, and primary coil is around the side of annular core, and secondary coil is around the opposite side of annular core.
4. tape voltage protection with sensitivity as claimed in claim 1 or 2, is characterized in that: connect induced voltage between described zero line N, the input of ground wire E and eliminate circuit.
5. tape voltage protection with sensitivity as claimed in claim 4, is characterized in that: it is electric capacity that described induced voltage eliminates circuit.
6. tape voltage protection with sensitivity as claimed in claim 1 or 2, is characterized in that: connect ground wire electrification indicating circuit between described zero line N, the input of ground wire E.
7. tape voltage protection with sensitivity as claimed in claim 6, is characterized in that: described ground wire electrification indicating circuit is that neon bulb is in series with a resistor.
8. tape voltage protection with sensitivity as claimed in claim 1 or 2, is characterized in that: parallel connection of secondary windings regulating resistance of described transformer.
9. tape voltage protection with sensitivity as claimed in claim 3, is characterized in that: parallel connection of secondary windings regulating resistance of described transformer.
10. tape voltage protection with sensitivity as claimed in claim 1 or 2, is characterized in that: also arrange overtemperature sensing element, triggers controllable silicon again after arbitrary amplifying circuit amplification of its output signal input second amplifying circuit.
CN201210287915.6A 2012-08-14 2012-08-14 One is tape voltage protection with sensitivity Active CN102842889B (en)

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Application Number Priority Date Filing Date Title
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CN102842889B true CN102842889B (en) 2016-02-17

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104319730A (en) * 2014-09-29 2015-01-28 余姚市嘉荣电子电器有限公司 Leakage protection plug
CN105552832B (en) * 2015-10-27 2018-10-26 东莞酷派软件技术有限公司 A kind of earth leakage protective device, power supply adaptor and earth leakage protective method
CN111585265A (en) * 2020-06-03 2020-08-25 广东电网有限责任公司惠州供电局 Secondary equipment test power supply safe starting protection device and application

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102364762A (en) * 2011-08-09 2012-02-29 刘睿刚 Leakage protection plug
CN102377165A (en) * 2011-11-24 2012-03-14 佛山市新基德电子厂有限公司 Power leakage protection device with temperature protection function
CN202772550U (en) * 2012-08-14 2013-03-06 钱加灿 High sensitivity ground wire electriferous protection apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102364762A (en) * 2011-08-09 2012-02-29 刘睿刚 Leakage protection plug
CN102377165A (en) * 2011-11-24 2012-03-14 佛山市新基德电子厂有限公司 Power leakage protection device with temperature protection function
CN202772550U (en) * 2012-08-14 2013-03-06 钱加灿 High sensitivity ground wire electriferous protection apparatus

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