Integral cycle switch synchronized to axis-crossing

Details Integral cycle switch synchronized to axis-crossing Integral cycle switch synchronized to axis-crossing

1977-07-19

1979-06-05

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307252N, 307252UA, 307311, 323 18, 323 24, H03K 1772

Patent

active

041574818

ABSTRACT:
A switching circuit is comprised of a triac in series with the electrical load across an AC power source. The triac commences to conduct only after a unidirectional, gate-controlled SCR is conducting. Conduction of the SCR drives the gate of the triac enabling conduction. In turn, the SCR is controlled by a circuit network which regulates the potential at the SCR gate and is responsive to an external device which may be a photodetector and movable shutter in combination with a light-emitting diode (LED). Load conduction commences in synchronism with the source voltage crossing of the reference axis in a selected direction. When the load is turned off, an integral cycle is provided.

REFERENCES:
patent: 3569999 (1971-03-01), Pascente
patent: 3668422 (1972-06-01), Pascente
patent: 3708696 (1973-01-01), Lorenz
patent: 3917962 (1975-11-01), Pascente

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