Gate drive circuit for power converters that reduces surge volta

Details Gate drive circuit for power converters that reduces surge volta Gate drive circuit for power converters that reduces surge volta

1997-10-16

1999-08-10

Sterrett, Jeffrey

Electricity: power supply or regulation systems

In shunt with source or load

Using a three or more terminal semiconductive device

323271, 323289, 363 56, G05F 316

Patent

active

059363878

ABSTRACT:
A current detector includes a chopper circuit composed of a switching circuit, i.e. an inverse-parallel circuit composed of an insulated gate bipolar transistor IGBT and a diode, and a switching circuit, i.e. an inverse-parallel circuit composed of an IGBT and a diode, which are connected in series. When the diode on the opposite arm is turned on, a reverse recovery current is detected and its output is directed to a gate drive circuit via an insulating circuit. A switch in the gate drive circuit is opened to increase resistance, in order to reduce the speed at which the gate of the switching device is charged. Thus, the surge voltage and its increase ratio are reduced without reducing a switching speed or requiring a snubber circuit.

REFERENCES:
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patent: 4796145 (1989-01-01), Oshikiri
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patent: 5204504 (1993-04-01), Tanaka
patent: 5552695 (1996-09-01), Schwartz
patent: 5808455 (1998-09-01), Schwartz et al.
A Study on Soft-Switching Gate Drive for IGBTS, Hideki Miyazaki, Kazuo Kato (Hitachi Ltd.), pp. 289-292, Sep. 1997.
A New Driving Circuit for IGBT Devices, IEEE Transactions on Power Electronics, vol., 10, No. 3, May 1995, pp. 373-378.

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