Electronic variac surge current limiting circuit

Details Electronic variac surge current limiting circuit Electronic variac surge current limiting circuit

1974-06-24

1976-03-30

Shoop, William M.

Electricity: power supply or regulation systems

Remote sensing

307293, 323 34, 323 37, G05F 110

Patent

active

039477517

ABSTRACT:
A circuit having a gated, symmetrical switch is provided for insertion between an AC source of power and a load, and prevents a surge current from entering the load when the AC input is initially applied. A symmetrical negative resistance device that begins conducting at a prescribed voltage and remains on as a constant voltage regulator until the AC input voltage drops below a sustaining value is connected to provide the prescribed voltage to the gate control of the gated symmetrical switch. An RC circuit controls the length of time required for the AC input voltage to reach the prescribed voltage at the input to the symmetrical negative resistance device. At least part of the resistance in the RC circuit is of the negative temperature coefficient type, resulting in the resistance value decreasing as the temperature of the negative temperature coefficient device increases, thereby shortening the time after which the prescribed voltage to the symmetrical negative resistance device is applied.

REFERENCES:
patent: 3353078 (1967-11-01), Maynard
patent: 3363143 (1968-01-01), Cavanaugh
patent: 3479560 (1969-11-01), Paget et al.
patent: 3500174 (1970-03-01), Ellerbeck
patent: 3548290 (1970-12-01), Swinehart
patent: 3660687 (1972-05-01), Sahm et al.
patent: 3732484 (1973-05-01), McKenna
patent: 3821634 (1974-06-01), Sabolic

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