Transistor fault indicator

Details Transistor fault indicator Transistor fault indicator

1981-09-03

1984-06-12

Brigance, Gerald L.

Communications: electrical

Condition responsive indicating system

Specific condition

340635, 318641, 361 92, G08B 2100

Patent

active

044545037

ABSTRACT:
A transistor fault indicator circuit monitors the conduction state of a transistor and compares that state to a commanded state. Differences in states are treated as faults and actuate an alarm or shut down the system including the transistor. In systems in which the transistor may be operated in a continuous conduction mode for long time periods, a control circuit is provided to periodically short circuit the base-emitter bias of the transistor to force a momentary period of nonconduction during which time the proper operation of the transistor can be verified.

REFERENCES:
patent: 3818291 (1974-06-01), Miyake
patent: 3914675 (1975-10-01), Konrad
patent: 4017775 (1977-04-01), Artrip
patent: 4126889 (1978-11-01), Ibamoto et al.
patent: 4275342 (1981-06-01), Kawada et al.
patent: 4355342 (1982-10-01), Franzolini

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