Phase-controlled power switching circuit

Details Phase-controlled power switching circuit Phase-controlled power switching circuit

1986-05-28

1987-10-27

Zazworsky, John

Electrical transmission or interconnection systems

With nonswitching means responsive to external nonelectrical...

Temperature responsive

307592, 307597, 307643, 323243, H03K 1772

Patent

active

047031972

ABSTRACT:
The application of a controlled amount of alternating current (AC) power to an electrical load is achieved in a power switching circuit utilizing phase-control. In the switching circuit, a first analog signal is generated and repeats in every half-cycle of the AC power voltage waveform. A second analog signal is generated and is changeable in value either in a predetermined manner, or in response to the control input signal. The second signal is not synchronized with the half-cycles of the power source. A comparator detects when the first signal intersects the second signal in value and thereupon initiates gating of a switching device, such as a silicon-controlled rectifier.

REFERENCES:
patent: 3588598 (1971-06-01), Isaacs
patent: 3610961 (1971-10-01), Hewlett, Jr.
patent: 3633094 (1972-01-01), Clements
patent: 3821634 (1974-06-01), Sabolic
patent: 3859591 (1975-01-01), Saunders
patent: 4296312 (1981-10-01), Salem

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