Electricity: electrical systems and devices – Safety and protection of systems and devices – Voltage regulator protective circuits
Patent
1995-02-22
1996-09-24
DeBoer, Todd
Electricity: electrical systems and devices
Safety and protection of systems and devices
Voltage regulator protective circuits
361111, 361 56, 361 91, 361 58, H02H 904
Patent
active
055596568
ABSTRACT:
A circuit for preventing switching voltage transients from damaging the IGBT during short circuit shut off, utilizing electronic gate control which decrease the rate of fall of the gate voltage of the IGBT only when a short circuit condition is sensed, thereby avoiding any losses during normal switching operation. In a first embodiment, a considerably higher value of gate resistor is switched-in in series with the gate resistor during a short circuit condition. In a second embodiment, a considerably higher value of external capacitor is switched-in in parallel with the IGBT gate input capacitance during a short circuit condition.
REFERENCES:
patent: 4719531 (1988-01-01), Okado et al.
patent: 4893158 (1990-01-01), Mihara et al.
patent: 5179488 (1993-01-01), Rovner
DeBoer Todd
International Rectifier Corporation
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