Switching circuit for connecting an AC source to a load

Details Switching circuit for connecting an AC source to a load Switching circuit for connecting an AC source to a load

1978-06-23

1981-03-24

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307311, 323319, H03K 1772

Patent

active

042582768

ABSTRACT:
In the disclosed circuit, a bilateral breakdown switch such as a triac includes two terminals for connecting an AC source to a load. A variable input arrangement, such as one which includes an LED and a photoresistor, operates a control electrode on the switch to turn the switch on and off in response to an input signal. The switch is disabled when the momentary AC voltage exceeds a predetermined value. This is done by a sensor that senses voltage and a bilateral switching arrangement that responds to the sensor and turns off the switch in response to a voltage higher than a predetermined value. According to one embodiment, the bilateral switching arrangement is composed of two complementarily poled transistors connected in parallel with respective bases connected to the sensor. Series diodes provide unidirectionality for the transistors. Back-to-back parallel diodes connected to the control electrode compensate for the voltage drop caused by the series diodes.

REFERENCES:
patent: 3450891 (1969-06-01), Riley
patent: 3648075 (1972-03-01), Mankovitz
patent: 3777188 (1973-12-01), Mazur
patent: 3855482 (1974-12-01), Wills
patent: 3902080 (1975-08-01), St. Clair et al.
patent: 3920955 (1975-11-01), Nakata
patent: 4021683 (1977-05-01), Splatt

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