CN102928750B - Alternating voltage insulation failure detection device - Google Patents
Alternating voltage insulation failure detection device Download PDFInfo
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- CN102928750B CN102928750B CN201210424928.3A CN201210424928A CN102928750B CN 102928750 B CN102928750 B CN 102928750B CN 201210424928 A CN201210424928 A CN 201210424928A CN 102928750 B CN102928750 B CN 102928750B
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Abstract
The invention discloses an alternating voltage insulation failure detection device which comprises a first TVS (transient voltage suppressor) transistor, a second TVS transistor and a voltage division circuit, wherein the anode of the first TVS transistor and the anode of the second TVS transistor are respectively connected with the live line end and null line end of the high voltage end of an alternative current; the cathode of the first TVS transistor is connected with the cathode of the second TVS transistor; the voltage division circuit comprises a first resistor and a second resistor; one end of the first resistor is connected with the co-joint of the anode of the first TVS transistor and the anode of the second TVS transistor; the other end of the first resistor is connected with one end of the second resistor; and the other end of the second resistor is connected with a low voltage end. By adopting the technical scheme, when the output voltage of the voltage division circuit is larger than a preset threshold, the situation that insulation failure occurs between the high voltage end and low voltage end of the alternative current can be judged. Due to the two TVS transistors, the electrical equipment damage caused by over-voltage of the alternative current can be prevented. According to the device, the resistance of an insulation resistor can be calculated, so that the application is expanded.
Description
Technical field
The present invention relates to failure of insulation detection technique.
Background technology
During vehicular applications, due to various situation, very easily the high-pressure side of circuit for generating and low pressure end failure of insulation situation, cause the damage of electronic system, even may cause serious security incident.For this reason, the device protection in the Insulation monitoring carrying out system and the failure of insulation situation of must taking appropriate measures.Insulation detecting circuit, as the attached electronic circuit of system, must meet following basic demand: 1) circuit structure is simple, and institute takes up space little as far as possible; 2) circuit must be reliable and stable.The components and parts adopted are as far as possible simple, not containing unstable element; 3) circuit portability is good, can easily in the face of complex situations.
Shared by existing Insulation monitoring and protection circuit, volume is comparatively large, and cost is higher, is not suitable in the higher circuit of integrated level.In addition, once there is the situation exchanging overvoltage, the damage of consumer is easily caused.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of height pressure side failure of insulation pick-up unit, and it can detect the situation of the failure of insulation between ac high-voltage end and low pressure end, in addition, can also prevent the consumer caused because exchanging overvoltage from damaging.
The technical solution adopted in the present invention is: a kind of alternating voltage failure of insulation pick-up unit, and its feature is, comprises the first TVS pipe, the second TVS pipe and bleeder circuit; Wherein, the positive pole of the first TVS pipe and the positive pole of the second TVS pipe are connected with the live wire end of ac high-voltage end and zero line side respectively, and the negative pole of the first TVS pipe is connected with the negative pole of the second TVS pipe; Bleeder circuit comprises the first resistance and the second resistance; The common contact of the negative pole of one end of the first resistance and the negative pole of the first TVS pipe and the second TVS pipe is connected, and the other end of the first resistance is connected with one end of the second resistance, and the other end of the second resistance is connected with low pressure end.
Adopt after technique scheme, when the output voltage of bleeder circuit be greater than one preset threshold value time, the situation that there occurs failure of insulation between ac high-voltage end and low pressure end can be judged.In addition, owing to adding two TVS pipe, can prevent the consumer caused because exchanging overvoltage from damaging.The resistance size of insulation resistance can also be calculated to do the expanded application of circuit by the present invention.Circuit structure of the present invention is simple, and testing result reliability is high.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of an embodiment according to alternating voltage failure of insulation pick-up unit of the present invention.
Fig. 2 be according to an embodiment of the invention alternating voltage failure of insulation pick-up unit exchange live wire end and low pressure end insulation fault time current direction schematic diagram.
Fig. 3 is the current direction schematic diagram of alternating voltage failure of insulation pick-up unit when AC zero line end and low pressure end insulation fault according to an embodiment of the invention.
Fig. 4 be according to an embodiment of the invention alternating voltage failure of insulation pick-up unit interchange live wire end and AC zero line end simultaneously to current direction schematic diagram during low pressure end insulation fault.
Embodiment
Below in conjunction with accompanying drawing, the present invention is made further instructions.
As shown in Figure 1, alternating voltage failure of insulation pick-up unit comprises a TVS(Transient Voltage Suppressor according to an embodiment of the invention) pipe TVS1, the second TVS pipe TVS2 and bleeder circuit.
Wherein, the positive pole of the first TVS pipe TVS1 and the positive pole of the second TVS pipe TVS2 are connected with the live wire end P of ac high-voltage end and zero line side N respectively, and the negative pole of the first TVS pipe TVS1 is connected with the negative pole of the second TVS pipe TVS2.Bleeder circuit comprises the first resistance R1 and the second resistance R2.The common contact of the negative pole of one end of the first resistance R1 and the negative pole of the first TVS pipe TVS1 and the second TVS pipe TVS2 is connected, and the other end of the first resistance R1 is connected with one end of the second resistance R2, and the other end of the second resistance R2 and low pressure end G(are with reference to ground) be connected.Preferably, the resistance of R1 is more than 100 times of the resistance of R2.
After adopting technique scheme, if do not have the generation of leakage current (leakage resistance) between ac high-voltage end and low pressure end, then exchange live wire end P and AC zero line end N and low pressure end G(with reference to ground, actual is device casing) there is no loop, also just do not have electric current to produce, the voltage of Uo point is 0V.Consider the size of R2 and error component etc., a threshold value (being such as 2.3V) can be set, when the output voltage Uo of bleeder circuit is greater than threshold value that this presets, the situation that there occurs failure of insulation between ac high-voltage end and low pressure end can be judged.
Insulation situation in circuit may have four kinds altogether, below will illustrate one by one.For convenience of explanation, have ignored the conduction voltage drop of the TVS pipe in circuit herein.
1). insulate normal situation
Under normal operating condition, the value of Uo is 0V.In this case, have
2). exchange live wire end P and low pressure end G(with reference to) between failure of insulation
Exchange between live wire end P and low pressure end G if failure of insulation occurs in, be equivalent to exchange between live wire end P and low pressure end G and in a resistance X1(figure with reference to be not real the earth, this end points is unsettled, and does not have current loss).Due to the characteristic of TVS pipe one-way conduction, the moment making AC signal only be greater than Up at Un just has electric current generation, i.e. the positive half cycle of AC signal, and as seen from Figure 2, the voltage of now circuit output Uo is greater than 0V because there being current return.
In this case, have
The insulation resistance X between the live wire end P of ac high-voltage end and low pressure end G can be calculated according to following formula
1:
3). AC zero line end N and low pressure end G(are with reference to ground) between failure of insulation
If failure of insulation occurs between AC zero line end N and low pressure end G, to be equivalent between AC zero line end N and low pressure end G and in a resistance X2(figure with reference to be not real the earth, this end points is unsettled, and does not have current loss).The moment that AC signal is only greater than Un at Up just has electric current generation, i.e. the negative half period of AC signal, and as seen from Figure 3, the voltage that circuit exports Uo is greater than 0V because there being current return.
In this case, have
The insulation resistance X between the zero line side N of ac high-voltage end and low pressure end G can be calculated according to following formula
2:
4). exchange live wire end P and AC zero line end N and low pressure end G(with reference to) between insulation situation about simultaneously losing efficacy
When Un is greater than Up, electric current I n is with the path circulation from N to P, and when Up is greater than Un, electric current I p circulates with the path from P to N, as shown in Figure 4.
The insulation resistance X between the live wire end P of ac high-voltage end and low pressure end G can be calculated according to following formula
1and the insulation resistance X between the zero line side N of ac high-voltage end and low pressure end G
2:
By the present invention, the detection (touching the human body resistance 220K Ω in situation as hand) of basic insulation situation can be carried out, and the resistance size of insulation resistance can be calculated further, to do the expanded application of circuit.Such as, the present invention may be used in DC/AC inverter, carries out alternating current pressure side Insulation monitoring.When detecting that resistance is less than 220K Ω, turn off inverter to protect circuit at once.
Claims (2)
1. an alternating voltage failure of insulation pick-up unit, is characterized in that, comprises the first TVS pipe, the second TVS pipe and bleeder circuit;
Wherein, the positive pole of the first TVS pipe and the positive pole of the second TVS pipe are connected with the live wire end of ac high-voltage end and zero line side respectively, and the negative pole of the first TVS pipe is connected with the negative pole of the second TVS pipe;
Described bleeder circuit comprises the first resistance and the second resistance; The common contact of the negative pole of one end of the first resistance and the negative pole of the first TVS pipe and the second TVS pipe is connected, and the other end of the first resistance is connected with one end of the second resistance, and the other end of the second resistance is connected with low pressure end.
2. alternating voltage failure of insulation pick-up unit as claimed in claim 1, it is characterized in that, the resistance of the first resistance is more than 100 times of the resistance of the second resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210424928.3A CN102928750B (en) | 2012-10-31 | 2012-10-31 | Alternating voltage insulation failure detection device |
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| CN201210424928.3A CN102928750B (en) | 2012-10-31 | 2012-10-31 | Alternating voltage insulation failure detection device |
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| CN102928750A CN102928750A (en) | 2013-02-13 |
| CN102928750B true CN102928750B (en) | 2015-02-18 |
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| CN106707032A (en) * | 2017-01-19 | 2017-05-24 | 厦门昰能机电科技有限公司 | Ground wire resistance value detection circuit |
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| KR200210620Y1 (en) * | 1998-05-29 | 2001-02-01 | 김형국 | Lightning arrester test device |
| JP4098069B2 (en) * | 2002-12-04 | 2008-06-11 | 株式会社デンソー | Insulation failure detection circuit for motor circuit system |
| CN102298091B (en) * | 2011-05-16 | 2013-07-17 | 江苏斯达工业科技有限公司 | Detection circuit of direct-current power supply insulation resistance to ground |
| CN102426326A (en) * | 2011-09-08 | 2012-04-25 | 惠州市亿能电子有限公司 | Detection method of electric automobile insulating performance |
| CN102692591B (en) * | 2012-06-19 | 2015-07-29 | 科博达技术有限公司 | Height pressure side failure of insulation pick-up unit and detection method thereof |
| CN202886538U (en) * | 2012-10-31 | 2013-04-17 | 科博达技术有限公司 | Alternating-current voltage insulating failure detection device |
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Address after: 201203 Shanghai free trade zone Zuchongzhi Road No. 2388 building 1-2 Co-patentee after: Zhejiang Keboda Industrial Co., Ltd. Patentee after: Koboda technology, Limited by Share Ltd Address before: 201203, 1758 Zhangjiang East Road, Zhangjiang hi tech park, Shanghai, Pudong New Area Co-patentee before: Zhejiang Keboda Industrial Co., Ltd. Patentee before: Keboda Technology Corp. |
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