Zero voltage switching solid state relay

Details Zero voltage switching solid state relay Zero voltage switching solid state relay

1977-09-06

1979-11-27

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307252B, 307252UA, 307311, 323 22SC, H03K 1772

Patent

active

041762886

ABSTRACT:
A solid state relay or controlled switch for connecting an AC power source to a load includes a solid state switching circuit in which a semiconductor controlled rectifier element, such as a photothyristor, thyristor or light-AC controlled element, is ignited by an external control signal, thereby to feed a load with an alternating current. A zero voltage switching circuit which executes switching when the instantaneous value of the amplitude of the supply voltage of the AC load current is zero or a value close thereto is connected to the rectifier element. As an improvement, a series circuit consisting of a resistor and a capacitor are connected between the base and emitter of a transistor in the zero voltage switching circuit. Thus, a zero voltage switching solid state relay whose withstand voltage build-up rate is enhanced and whose switching is endowed with a hysteresis characteristic is provided.

REFERENCES:
patent: 3372328 (1968-03-01), Pinckaers
patent: 3758793 (1973-09-01), Pascente
patent: 3815668 (1974-06-01), Carlson
patent: 3902080 (1975-08-01), St. Clair et al.

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