Method and apparatus for protecting an adjustable impedance elem

Details Method and apparatus for protecting an adjustable impedance elem Method and apparatus for protecting an adjustable impedance elem

1996-12-27

1998-07-14

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 79, 361101, 323277, H02H 504

Patent

active

057813850

ABSTRACT:
A method of protecting an adjustable impedance element such as a transistor controlling the power supplied to an electric motor, in particular in a motor vehicle, wherein the control of said adjustable impedance element is modified when the current passing through it exceeds a given threshold, characterized in that said current threshold is an increasing function of the voltage U.sub.M across the terminals of the motor.

REFERENCES:
patent: 4979066 (1990-12-01), Kawata et al.
patent: 5418676 (1995-05-01), Murakami et al.
patent: 5666043 (1997-09-01), Henry et al.

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