Power transistor overcurrent protection circuit

Details Power transistor overcurrent protection circuit Power transistor overcurrent protection circuit

1993-09-16

1996-01-16

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 83, 361 94, 361 79, 361 86, 361 87, H02H 3093

Patent

active

054853419

ABSTRACT:
An overcurrent protection circuit for a power transistor for generating a main current in response to a gate drive voltage generated by a gate circuit. The overcurrent protection circuit includes a current detection circuit for detecting the main current flowing in the power transistor to generate a detection voltage corresponding to the main current, and a level detection circuit connected to receive the detection voltage for generating a control current corresponding to a difference between the detection voltage and a prescribed value when the detection voltage exceeds the prescribed value. The overcurrent protection circuit further includes a current control circuit connected to receive the control current for limiting the main current by regulating the gate drive voltage based on the control current, and a drive instruction control circuit connected to receive the control current for making the main current zero by controlling the gate drive voltage to an OFF condition based on the control current.

REFERENCES:
patent: 4321648 (1982-03-01), Kaplan
patent: 4623950 (1986-11-01), Palara et al.
patent: 4680664 (1987-07-01), Leuthen
patent: 4721869 (1988-01-01), Okado
patent: 5200878 (1993-04-01), Sasagawa et al.

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