Overdissipation protection circuit for a semiconductor switch

Details Overdissipation protection circuit for a semiconductor switch Overdissipation protection circuit for a semiconductor switch

1985-02-21

1987-06-09

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 98, 323276, H02H 902

Patent

active

046725024

ABSTRACT:
An overdissipation protection circuit for a semiconductor switch is disclosed in which the switch circuit is converted into a relaxation oscillator when the current drawn by the load exceeds a predetermined value. Dissipation in the switch semiconductor is reduced because it remains on only for a brief period of time during the relaxation oscillator cycle. If the current drawn by the load exceeds a second predetermined value, the semiconductor switch is turned off. The protection circuit is automatically reset when the relaxation oscillator reaches an on state and the current drawn by the load does not exceed the predetermined value.

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