Protection circuit for transistorized switch

Details Protection circuit for transistorized switch Protection circuit for transistorized switch

1977-11-30

1979-06-19

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 88, 361 89, 361 92, H02H 326

Patent

active

041588665

ABSTRACT:
The collector-emitter voltages (V.sub.ce) of each one of the two transistors of a single-pole-double-throw transistorized switch are independently sensed by a sensing circuit for producing a fault signal, whenever the V.sub.ce of each transistor concurrently approaches or exceeds the magnitudes of first and second DC reference voltages, respectively, by predetermined differentials. Control logic is responsive to the fault signal for removing the base drive from the conducting one of the transistors. An RC network is included in the sensing circuit, for delaying the production of the fault signal, both to avoid false triggering of the control logic, and to provide time for sequentially turning off one transistor and turning on the other transistor.

REFERENCES:
patent: 3408589 (1968-10-01), Nishioka
patent: 3449598 (1969-06-01), Wright
patent: 3534249 (1970-10-01), Neill et al.
patent: 3854089 (1974-12-01), Emler
patent: 3914667 (1975-10-01), Waldron

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