Power element driving circuit

Details Power element driving circuit Power element driving circuit

1997-07-14

1998-12-22

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 93, H02H 700

Patent

active

058525386

ABSTRACT:
A power element driving circuit is provided with an abnormality detecting circuit which detects an occurrence of abnormality in an IGBT (power element) or a short-circuit load based on a collector voltage of the IGBT, and controls a gate voltage control circuit so as to gradually reduce a gate voltage of the IGBT. According to the described arrangement, the IGBT can be protected from breakdown caused by short-circuit current increased by itself due to an inverse current from the load. Moreover, since an occurrence of abnormality in the IGBT is detected after starting up the IGBT, the rise time for the IGBT can be reduced, thereby preventing the thermal breakdown or power loss which may occur when a long rise time is required.

REFERENCES:
patent: 4721869 (1988-01-01), Okado
patent: 5200878 (1993-04-01), Sasagawa et al.
patent: 5200879 (1993-04-01), Sasagawa et al.
patent: 5383082 (1995-01-01), Nishizawa
patent: 5485341 (1996-01-01), Okado et al.
Miyazaki, et al.; "A Novel High Voltage Three-Phase Monolithic Inverter IC with Two Current levels of Sensing"; 3rd International Symposium on Power Semiconductor Devices and ICs; Apr. 22-24, 1991, pp. 248-253.

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