Two-pole overcurrent protection device

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor

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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

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