Surge current protection circuit

Details Surge current protection circuit Surge current protection circuit

1976-10-12

1978-05-23

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

330207P, 363 15, 363 53, H02H 710

Patent

active

040914348

ABSTRACT:
A surge current protection circuit includes an input terminal supplied with a rectified alternating voltage, an output terminal to be connected to a load, and a semiconductor controlled rectifier having its anode and cathode electrodes connected in series between the input and output terminals. The collector and emitter electrodes of a control transistor are connected between the gate and cathode electrodes of the rectifier. The base-emitter voltage is supplied with any sharp transients, and the transistor becomes conductive before the rectifier if the transients are sharp enough and of high enough amplitude. Conduction of the transistor prevents the semiconductor controlled rectifier from conducting surge currents and protects circuits connected in series with the rectifier.

REFERENCES:
patent: 3377540 (1968-04-01), Meyer
patent: 3401327 (1968-09-01), Leppert
patent: 3419781 (1968-12-01), Davin
patent: 3781608 (1973-12-01), Geiger
patent: 3787756 (1974-01-01), Berger
patent: 3792289 (1974-02-01), Kazem

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