Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1974-09-30
1976-03-09
Griffin, Robert L.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307 60, 307264, 325159, 325187, 328175, H04B 104
Patent
active
039434460
ABSTRACT:
A system for controlling and maintaining the power output of a broadcast transmitter under varying line voltage conditions, including a pulse width modulator wherein a triangular wave acting as a reference input is compared to the audio input. Power is controlled by varying the amplitude of the triangular wave relative to the audio input which additionally includes a DC bias thereby increasing or decreasing the comparator square wave output duty cycle which output is used to control the transmitter's RF power amplifier. Three separate DC control inputs, respectively, for automatic power control, remote or local manual power control, and a slow start control are summed and fed to an operational DC amplifier which provides a composite DC output which is fed to a triangular waveform generator in order to control the amplitude of the triangular waveform generated thereby.
REFERENCES:
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patent: 3115611 (1963-12-01), Potts, Jr. et al.
patent: 3155838 (1964-11-01), Brahm
patent: 3262056 (1966-07-01), Johnson et al.
patent: 3440566 (1969-04-01), Swanson
patent: 3486128 (1969-12-01), Lohrmann
patent: 3506920 (1970-04-01), Swanson
patent: 3551851 (1970-12-01), Engel
patent: 3585517 (1971-06-01), Herbert
patent: 3644832 (1972-02-01), Sherman, Jr.
patent: 3828270 (1974-08-01), Ebisch
Bookbinder Marc E.
Griffin Robert L.
Hinson J. B.
Westinghouse Electric Corporation
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