Protective circuit for semiconductor power device

Details Protective circuit for semiconductor power device Protective circuit for semiconductor power device

1995-06-06

1997-06-03

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 93, 361 98, 257355, H02H 300

Patent

active

056360975

ABSTRACT:
A circuit is provided for protecting against an increase in collector current for an integrated circuit containing a power switching device. The power device drives an inductive load connected to a power supply, and is connected to a control circuit for switching the power device on and off. The protection circuit contains a clamping circuit for deactivating the control circuit and switching the power device off when the current flowing through the power device reaches a preset maximum value. In addition, a circuit is provided for inhibiting the operation of the clamping circuit for a preset time interval after the power device has been switched on, and for keeping the clamping circuit in operation during voltage undershoots caused by the inductive load following the switching of the powered device off.

REFERENCES:
patent: 4562454 (1985-12-01), Schultz et al.
patent: 4721869 (1988-01-01), Okado
patent: 4937697 (1990-06-01), Edwards et al.
Siemens forshungs-Und Entwicklungsberichte, vol. 17, 1988 Berlin Germany, pp. 27-34, G. Miller, APorst, H. Strack, "SIRET .RTM., a 1000v Bipolar Transistor with no Two-Dimensional Parasitic Effects".

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