Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1984-02-08
1985-10-08
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361100, 361111, 357 38, 357 231, 307252C, H02H 720, H01L 2974
Patent
active
045464014
ABSTRACT:
A two-pole overcurrent protection device arranged to interrupt the current flowing in a conductor if the current exceeds a predetermined level employs a semiconductor wafer on which is formed a turn-off thyristor and a MOS transistor. The control electrode of the transistor is supplied with a voltage dependent on the on-state voltage drop of the thyristor and, therefore, on its current, and at a certain thyristor current the transistor short-circuits one of the emitter junctions of the thyristor to extinguish the thyristor. For firing the thyristor, one of the base layers thereof is supplied with a gate trigger current via a JFET transistor portion formed in the semiconductor wafer with a horizontal channel region. This transistor portion is designed so that its saturation current exceeds, with a suitable margin, the current necessary for firing the thyristor. When a high voltage exists across the thyristor, the transistor portion will limit the current flowing to the base layer to a value which is equal to the saturation current of the transistor portion.
REFERENCES:
patent: 3263128 (1966-07-01), White
patent: 3303360 (1967-02-01), Gentry
patent: 4224634 (1980-09-01), Svedberg
patent: 4244000 (1981-01-01), Veda et al.
patent: 4268846 (1981-05-01), Spellman et al.
patent: 4331884 (1982-05-01), Svedberg
patent: 4400711 (1983-08-01), Avery
ASEA Aktiebolag
Salce Patrick R.
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