CN203688622U - End voltage optical fiber isolating sampling circuit of power semiconductor device - Google Patents
End voltage optical fiber isolating sampling circuit of power semiconductor device Download PDFInfo
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- CN203688622U CN203688622U CN201320797788.4U CN201320797788U CN203688622U CN 203688622 U CN203688622 U CN 203688622U CN 201320797788 U CN201320797788 U CN 201320797788U CN 203688622 U CN203688622 U CN 203688622U
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 30
- 239000013307 optical fiber Substances 0.000 title claims abstract description 28
- 238000005070 sampling Methods 0.000 title abstract description 8
- 238000002955 isolation Methods 0.000 claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims description 19
- 239000000835 fiber Substances 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 abstract 3
- 238000001514 detection method Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model belongs to the field of a power semiconductor device, and aims to provide an end voltage optical fiber isolating sampling circuit of a power semiconductor device. The end voltage optical fiber isolating sampling circuit comprises the components of: an end voltage sampling circuit which is connected with two ends of the power semiconductor device, a voltage stabilizing circuit, a signal generating circuit and a signal isolating and transmitting circuit. The output end of the end voltage sampling circuit is connected with the input end of the voltage stabilizing circuit. The output end of the voltage stabilizing circuit is connected with the power supplying ends of the signal generating circuit and the signal isolating and transmitting circuit. The output end of the signal generating circuit is connected with the input end of the signal isolating and transmitting circuit. The signal isolating and transmitting circuit comprises an optical fiber transmitting module and an optical fiber receiving module which are connected through an optical fiber. The end voltage optical fiber isolating sampling circuit of the power semiconductor device is beneficial in that: power supplied by an external power supply is not required; reliability and stability of the equipment are improved; a narrow-pulse signal is adopted, thereby consuming small power and realizing higher stability of the sampling signal; and furthermore voltage isolation grade is improved, thereby ensuring high stability and high reliability of the equipment in high-voltage large-power application field.
Description
Technical field
The utility model belongs to power semiconductor device application, is specifically related to a kind of power semiconductor device terminal voltage optical fiber isolation sample circuit.
Background technology
Power semiconductor device, as thyristor, IGBT, IGCT etc., has been widely used in all kinds of current transformers, as three phase rectifier, frequency converter, active filter, high voltage direct current power transmission and transformation etc.In high-power application, because single device withstand voltage is inadequate, conventionally adopt multiple devices to connect to improve proof voltage ability.Current large power semiconductor device generally all presents short-circuit condition after damaging, when in series connection device a certain damage after short circuit, the voltage load of other device increases the weight of, if detection alarm in time certainly will cause damage the initiating failure expansion of other device.
Utility model content
The technical problems to be solved in the utility model is, overcomes deficiency of the prior art, and a kind of large power semiconductor device terminal voltage optical fiber isolation sample circuit is provided.
For technical solution problem, solution of the present utility model is:
A kind of power semiconductor device terminal voltage optical fiber isolation sample circuit is provided, comprises the terminal voltage sample circuit joining with power semiconductor device two ends; Also comprise mu balanced circuit, signal generating circuit and signal isolation and transmission circuit; The output terminal of described terminal voltage sample circuit is connected with the input end of mu balanced circuit; The output terminal of mu balanced circuit is connected with the feeder ear of signal isolation and transmission circuit with signal generating circuit, and the output terminal of signal generating circuit is connected with the input end of signal isolation and transmission circuit; Signal isolation and transmission circuit comprises optical fiber sending module and the optic fiber transceiver module connected by optical fiber.
Improve as one, described optical fibre optical fibre receiver module is connected with the testing circuit of rear class.
Improve as one, described power semiconductor device is thyristor or IGBT, IGCT.
Improve as one, described terminal voltage sample circuit comprises the resistance of two series connection, and an output terminal of terminal voltage sample circuit is connected to the mid point of two resistance, and another output terminal joins with one end of power semiconductor device.
Improve as one, described mu balanced circuit comprises a rectifier and a filter capacitor, rectifier two output terminals being connected to terminal voltage sample circuit in parallel with filter capacitor.
Improve as one, described signal generating circuit comprises two resistance, two electric capacity and 555 integrated packages; The GND end ground connection of 555 integrated packages, its CV end, THR end are respectively by a capacity earth, and each earth terminal is also connected (described " ground connection " refers to join with the negative terminal of power semiconductor device) with an output terminal of mu balanced circuit simultaneously; The DIS end of 555 integrated packages is connected with THR end by a resistance; TRIG end is directly connected with THR end; DIS end is also connected with VCC end, R end by another resistance, and R end is connected with another output terminal of mu balanced circuit with VCC end; The Q end of 555 integrated packages is signal output part.
Improve as one, described signal isolation and transmission circuit comprises a resistance, and one is terminated at the output terminal of mu balanced circuit, and the other end and optical fiber sending module join; Optic fiber transceiver module is connected to the output terminal of signal generating circuit.
In circuit of the present utility model, the narrow pulse signal that produces constant frequency by described signal generating circuit is as detection signal, and burst pulse frequency is:
In this formula, f is the frequency of narrow pulse signal; R
3it is the resistance that connects 555 integrated package DIS ends and the resistance that VCC holds, R holds; R
5it is the resistance that connects the resistance of 555 integrated package DIS ends and THR end; C
3it is the electric capacity that connects the electric capacity of 555 integrated package CV ends, THR end and ground connection.
Compared with prior art, the beneficial effects of the utility model are:
1, the working power that the utility model adopts all, from the terminal voltage of power semiconductor device, is powered without exterior power supply, the interference of having stopped to be brought by exterior power supply;
2, the detection signal of the utility model using the signal of constant frequency as late-class circuit, not high to the designing requirement of late-class circuit, improved the reliability and stability of equipment;
3, the narrow pulse signal that the utility model signal generating circuit produces, owing to adopting high impedance dividing potential drop, carrying load ability is poor, and the power that adopts narrow pulse signal to consume is little, can make sampled signal more stable;
4, the utility model adopts optical fiber transmission signal, compare other signal transmission form, except having very strong antijamming capability, the more important thing is that voltage isolation Level improves greatly, for stability and the reliability of equipment in high-power application provides guarantee.
Brief description of the drawings
Fig. 1 is theory diagram of the present utility model;
Fig. 2 is a kind of implementing circuit figure of the present utility model.
Embodiment
Following embodiment can make the technician of this professional skill field more fully understand the utility model, but limits never in any form the utility model.
Fig. 1 is theory diagram of the present utility model.Power semiconductor device terminal voltage optical fiber isolation sample circuit comprises the terminal voltage sample circuit 1 joining with power semiconductor device 5 two ends, and mu balanced circuit 2, signal generating circuit 3 and signal isolation and transmission circuit 4.The output terminal of described terminal voltage sample circuit 1 is connected with the input end of mu balanced circuit 2; The output terminal of mu balanced circuit 2 is connected with the feeder ear of signal isolation and transmission circuit 4 with signal generating circuit 3, and the output terminal of signal generating circuit 3 is connected with the input end of signal isolation and transmission circuit 4; Signal isolation and transmission circuit 4 comprises optical fiber sending module and the optic fiber transceiver module connected by optical fiber, and optic fiber transceiver module is connected with the testing circuit of rear class.Described power semiconductor device 5 is thyristor or IGBT.
Fig. 2 is a kind of implementing circuit figure of the present utility model.In this embodiment, terminal voltage sample circuit 1 comprises resistance R 1, the R2 of two series connection, and an output terminal of terminal voltage sample circuit 1 is connected to the mid point of two resistance, and another output terminal joins with one end of power semiconductor device 5.Terminal voltage sample circuit 1 carrys out the voltage signal at sample-power semiconductor devices two ends by resistance R 1, R2 dividing potential drop.
Mu balanced circuit 2 comprises a rectifier B and a filter capacitor C1, and two output terminals of terminal voltage sample circuit 1 connect and join successively with rectifier B, filter capacitor C1.Terminal voltage sample circuit 1 samples the voltage signal obtaining after rectifier B rectification and large capacitor C 1 filtering, can generate DC voltage stably, gives the circuit supply of rear class.
Signal generating circuit 3 comprises two resistance R 3, R5, two capacitor C 2, C3 and 555 integrated packages; The GND end ground connection of 555 integrated packages, its CV end, THR end are respectively by capacitor C 2, C3 ground connection, and each earth terminal is also connected with an output terminal of mu balanced circuit 1 simultaneously; The DIS end of 555 integrated packages is connected with THR end by resistance R 5; TRIG end is directly connected with THR end; DIS end is also connected with VCC end, R end by resistance R 3, and R end is connected with another output terminal of mu balanced circuit with VCC end; The Q end of 555 integrated packages is signal output part.Described " ground connection " refers to join with the negative terminal of detected power semiconductor device.
Signal isolation and transmission circuit 4 comprises resistance R 4, and optical fiber sending module and optic fiber transceiver module adopt respectively fiber optical transceiver 1521 and fiber optical transceiver 2521.One end of resistance R 4 is connected to the output terminal of mu balanced circuit 2, and the other end joins with 1 pin of fiber optical transceiver 1521; 2 pin of fiber optical transceiver 2521 are connected to the output terminal of signal generating circuit.
The DC voltage that mu balanced circuit 2 is exported, as the operating voltage of signal generating circuit 3, is connected to the R end of 555 integrated packages simultaneously, and the self-maintained circuit of 555 integrated circuit compositions is launched narrow pulse signal with constant frequency to late-class circuit.
The DC voltage that mu balanced circuit 2 is exported is connected to optic fiber transceiver module one end as operating voltage by resistance R 4, the narrow pulse signal that 555 integrated package Q ends produce sends to the other end of optic fiber transceiver module, then is sent to the testing circuit of rear class by optical fiber sending module.
Principle of work of the present utility model is: power semiconductor device 5 two ends of normal work exist voltage signal, through the sampling of impedance dividing potential drop, generating galvanic current through mu balanced circuit 2 again presses, signal generating circuit 3 is output as operating voltage with mu balanced circuit, produce the narrow pulse signal of constant frequency in the mode of monostable vibration, and launch constant frequency narrow pulse signal by signal isolation and transmission circuit 4 to the testing circuit of rear class.If power semiconductor device 5 damages, terminal voltage disappears, and signal generating circuit 3 and signal isolation and transmission circuit 4 can not be worked, and the testing circuit of rear class will not receive narrow pulse signal, will inspire alarm mechanism, take safeguard measure, avoid fault spread.
Signal generating circuit 3 produces the narrow pulse signal of constant frequency as detection signal, and burst pulse frequency is:
In this formula, f is the frequency of narrow pulse signal; R
3it is the resistance that connects 555 integrated package DIS ends and the resistance that VCC holds, R holds; R
5it is the resistance that connects the resistance of 555 integrated package DIS ends and THR end; C
3it is the electric capacity that connects the electric capacity of 555 integrated package CV ends, THR end and ground connection.
Therefore, actual range of the present utility model not only comprises the disclosed embodiments, is also included under claims and implements or to carry out all equivalents of the present utility model.
Claims (7)
1. a power semiconductor device terminal voltage optical fiber isolation sample circuit, comprises the terminal voltage sample circuit joining with power semiconductor device two ends; It is characterized in that, also comprise mu balanced circuit, signal generating circuit and signal isolation and transmission circuit; The output terminal of described terminal voltage sample circuit is connected with the input end of mu balanced circuit; The output terminal of mu balanced circuit is connected with the feeder ear of signal isolation and transmission circuit with signal generating circuit, and the output terminal of signal generating circuit is connected with the input end of signal isolation and transmission circuit; Signal isolation and transmission circuit comprises optical fiber sending module and the optic fiber transceiver module connected by optical fiber.
2. circuit according to claim 1, is characterized in that, described optical fibre optical fibre receiver module is connected with the testing circuit of rear class.
3. circuit according to claim 1, is characterized in that, described power semiconductor device is thyristor, IGCT or IGBT.
4. according to the circuit described in claim 1, it is characterized in that, described terminal voltage sample circuit comprises the resistance of two series connection, and an output terminal of terminal voltage sample circuit is connected to the mid point of two resistance, and another output terminal joins with one end of power semiconductor device.
5. circuit according to claim 1, is characterized in that, described mu balanced circuit comprises a rectifier and a filter capacitor, rectifier two output terminals being connected to terminal voltage sample circuit in parallel with filter capacitor.
6. circuit according to claim 1, is characterized in that, described signal generating circuit comprises two resistance, two electric capacity and 555 integrated packages; The GND end ground connection of 555 integrated packages, its CV end, THR end are respectively by a capacity earth, and each earth terminal is also connected with an output terminal of mu balanced circuit simultaneously, and described ground connection refers to join with the negative terminal of power semiconductor device; The DIS end of 555 integrated packages is connected with THR end by a resistance; TRIG end is directly connected with THR end; DIS end is also connected with VCC end, R end by another resistance, and R end is connected with another output terminal of mu balanced circuit with VCC end; The Q end of 555 integrated packages is signal output part.
7. circuit according to claim 1, is characterized in that, described signal isolation and transmission circuit comprises a resistance, and one is terminated at the output terminal of mu balanced circuit, and the other end and optical fiber sending module join; Optic fiber transceiver module is connected to the output terminal of signal generating circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320797788.4U CN203688622U (en) | 2013-12-05 | 2013-12-05 | End voltage optical fiber isolating sampling circuit of power semiconductor device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320797788.4U CN203688622U (en) | 2013-12-05 | 2013-12-05 | End voltage optical fiber isolating sampling circuit of power semiconductor device |
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| Publication Number | Publication Date |
|---|---|
| CN203688622U true CN203688622U (en) | 2014-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320797788.4U Expired - Lifetime CN203688622U (en) | 2013-12-05 | 2013-12-05 | End voltage optical fiber isolating sampling circuit of power semiconductor device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616547A (en) * | 2013-12-05 | 2014-03-05 | 杭州四达电炉成套设备有限公司 | Terminal voltage optical fiber isolating and sampling circuit and method of power semiconductor device |
-
2013
- 2013-12-05 CN CN201320797788.4U patent/CN203688622U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616547A (en) * | 2013-12-05 | 2014-03-05 | 杭州四达电炉成套设备有限公司 | Terminal voltage optical fiber isolating and sampling circuit and method of power semiconductor device |
| CN103616547B (en) * | 2013-12-05 | 2016-08-24 | 杭州四达电炉成套设备有限公司 | Power semiconductor terminal voltage Fiber isolation sample circuit and method |
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| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20140702 |