Electronic switching circuits

Details Electronic switching circuits Electronic switching circuits

1975-12-31

1977-05-03

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307252T, 307311, H03K 1760, H03K 1778

Patent

active

040216837

ABSTRACT:
An electronic switching circuit for controlling the supply of alternating current to a load, comprising a bi-directional rectifier combination having first and second trigger electrodes; first and second direct current trigger voltage supplies of equal voltage but electrically isolated from each other; a first switchable semiconductor device connected in series between the first direct current trigger voltage supply and the first trigger electrode of the bi-directional rectifier combination; a second switchable semiconductor device connected in series between the second direct current trigger voltage supply and the second trigger electrode of the bi-directional rectifier combination; and control means for rendering the switchable semiconductor devices conductive from the next zero-voltage instant of the alternating current supply after the onset of a control signal. The control means may include a full-wave rectifier combination, a third switchable semiconductor device connected to receive a control signal on one input and the unsmoothed output waveform of the full-wave rectifier circuit on another input so that it will conduct only when the control signal is on and the rectifier output is substantially at zero voltage; and means for rendering the first and second switchable semiconductor devices conductive when the third switchable semiconductor device conducts. An optional additional circuit may be arranged to inhibit the control signal if the voltage of the full-wave rectifier circuit exceeds a threshold while the supply is switched on.

REFERENCES:
patent: 3723769 (1973-03-01), Collins
patent: 3766409 (1973-10-01), Shuey
patent: 3816763 (1974-06-01), Korn et al.
"Optocoupler is Zero Crossing Detector and Isolator in Triac Power Control" Electronic Design 9/20/75 p. 104.

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