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Soft breaking circuit suitable for large power IGBT commercial driver chip

A drive chip and soft-off technology, applied in electrical components, electronic switches, pulse technology, etc., can solve the problem that users cannot adjust soft-off parameters, do not see the idea of ​​soft-off circuits, and cannot adapt to various working conditions, etc. problems, to avoid misleading conduction and overvoltage breakdown possible, to avoid the possible influence of electromagnetic interference, and to achieve the effect of simple external wiring

Active Publication Date: 2009-07-15
CHINA ELECTRIC POWER RES INST +1
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AI Technical Summary

Problems solved by technology

At present, only some high-power IGBT commercial driver chips have soft turn-off function, and users often cannot adjust their soft turn-off parameters, so they cannot adapt to various working conditions
[0004] At present, there is no idea of ​​this kind of soft turn-off circuit combined with commercial driver chips

Method used

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  • Soft breaking circuit suitable for large power IGBT commercial driver chip
  • Soft breaking circuit suitable for large power IGBT commercial driver chip
  • Soft breaking circuit suitable for large power IGBT commercial driver chip

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Embodiment Construction

[0024] The schematic diagram of the ladder wave output soft turn-off circuit is attached image 3 As shown, connect in parallel mode. The soft turn-off circuit includes the following functional blocks: level conversion circuit, delay circuit, level step generation circuit, signal combination circuit and power amplifier circuit. The soft-off control signal is input to the delay circuit through the level conversion circuit, and the delayed signal controls the action of the electric step generation circuit, and the generated electric step signal passes through the signal combining circuit to obtain the expected soft-off control step wave signal .

[0025] During normal operation, the soft-off signal is low, the soft-off circuit does not operate, and does not affect the normal operation of the commercial driver chip. When an over-current fault occurs, set the soft-off signal to be high, and the soft-off will start to act. The delay circuit will act on the upper edge of the soft-...

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Abstract

The present invention discloses a soft switching circuit, which is used assorting with commercial drive chip to realize soft switching function or replace original inappropriate soft switching function. The circuit should be provided with simple circuit interface for facilitating assort with commercial drive chip, and take internal power supply that use commercial drive chip as power supply source. Each parameter in the soft switching function is adjustable to adapt soft switching requirement under different working condition, and satisfies electro-magnetism compatible requirement in high power situation.

Description

technical field [0001] The invention belongs to the technical field of high-power IGBT drive circuits, in particular to a soft turn-off circuit suitable for high-power IGBT commercial drive chips. Background technique [0002] Because high-power IGBTs (insulated gate bipolar transistors) have high power levels, wide switching frequency ranges, and fully controllable insulated gate gate characteristics, they are widely used in the field of high-power power electronics. In addition, its power level can be further improved by connecting IGBTs in series and parallel, so that its application can be extended to the field of power electronics in power systems. However, in high-power situations, when there is a short circuit or an overcurrent fault, the current flowing through the IGBT is very large. At this time, if the traditional hard shutdown is used, the current drop rate will generate a very high induced voltage on the distribution parameters of the main circuit, which will ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/567H03K17/28
Inventor 卢婷温家良贺之渊易荣杨岳峰韩亚楠吴元熙
Owner CHINA ELECTRIC POWER RES INST
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