Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1985-12-27
1987-12-29
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361 93, 361101, 330207P, H02H 320
Patent
active
047164891
ABSTRACT:
A protection circuit is provided for a planar transistor device. The protection circuit comprises a variable resistor device formed of a junction type field effect transistor. The resistor device is connected in series with the base of the planar transistor. The drain electrode of the J-FET is connected to the base of the planar transistor while the collector of the planar transistor is connected to the gate of the J-FET. Due to this interconnected scheme, base input resistance of the planar transistor is increased to reduce its base current when a high voltage is applied accidentally to the collector. The base current is not eliminated, however, and the device is protected but can still operate.
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Imamura Kaoru
Muramoto Ken'ichi
Jennings Derek S.
Kabushiki Kaisha Toshiba
Pellinen A. D.
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