Transient protector

Details Transient protector Transient protector

1988-04-20

1990-05-08

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 91, 307255, 307631, H02H 320

Patent

active

049243411

ABSTRACT:
A transient protection circuit comprising using a circuit connected to operate as a diode while presenting lower forward voltage drop for the same area and current as in pn junction diodes to provide greater efficiency. The circuit is a standard merged SCR circuit wherein a resistive path is provide between the base and collector of the pnp transistor and between the base and emitter of the npn transistor. In addition, there is provided a trip circuit wherein current is shunted away from the lateral transistor after a predetermined threshold current is passed through said transistor to minimize current drawn through the later transistor.

REFERENCES:
patent: 4223281 (1980-09-01), Ahmed
patent: 4377832 (1983-03-01), Toney et al.
patent: 4426590 (1984-01-01), Rischmuller
patent: 4484244 (1984-11-01), Avery
patent: 4585905 (1986-04-01), Brown
patent: 4630162 (1986-12-01), Bell et al.
patent: 4631567 (1986-12-01), Kokado et al.
patent: 4760439 (1988-07-01), Borkowicz

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