Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1985-03-29
1987-03-17
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 86, 361 91, 361101, 361 87, H02H 308
Patent
active
046512527
ABSTRACT:
A power transistor control circuit for controlling the bias input to the power transducer. During normal operations two switching transistors bias the base input to a power transistor positively and negatively to turn the power transistor on and off. By back biasing a conducting transistor, however, the blocking voltage capability of the transistor is diminished. To maintain blocking voltage at a maximum, the present circuit senses overcurrent conditions indicating a problem condition exists and turns off the power transistor by neutrally biasing a base input. Preferably, both switching transistors used to bias the base input during normal operation of the transistor are rendered nonconductive to accomplish this neutral biasing.
REFERENCES:
patent: 3526846 (1970-09-01), Campbell
patent: 3536958 (1970-10-01), Sondermeyer
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patent: 4375074 (1983-02-01), Glogolja
patent: 4491744 (1985-01-01), Corey
patent: 4494164 (1985-01-01), Noel
patent: 4525765 (1985-06-01), Brajder
patent: 4538198 (1985-08-01), Imanishi et al.
Eaton Corporation
Jennings Derek S.
Pellinen A. D.
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