Amplifiers – Modulator-demodulator-type amplifier
Patent
1985-07-29
1986-12-09
Mullins, James B.
Amplifiers
Modulator-demodulator-type amplifier
330102, 330105, 330207A, 330251, H03F 338
Patent
active
046282750
ABSTRACT:
An efficient power amplifier for high-capacitive device C2 in load string 10. The load string 10 includes a reference capacitor C3, a resistor R1, and an inductor L1. A large capacitor C1 is connected to load string 10 through high voltage power bridge 28. A current sensing feedback 30 is utilized to produce a triangular waveform of current in load string 10 for causing charge to be alternatively removed from capacitor C1 and delivered to device C2 through inductor L1 and then returned to capacitor C1 with any losses replenished by the dc power source. A voltage sensing feedback 14 is used to modulate the triangular current waveform. The power amplifier behaves as a stable linear dc coupled operational amplifier delivering a large reactive current with only slight losses.
REFERENCES:
patent: 4092610 (1978-05-01), White et al.
patent: 4404526 (1983-09-01), Kirn
patent: 4531096 (1985-07-01), Yokoyama
Smart, "A Switching Amplifier for Capacitive Loads Using Incremental Resonant Charging," IEEE Power Electronics Specialists Conference San Diego, CA, 18-22 Jun. 1979, pp. 98-108.
Long Steven M.
Skipper John D.
Field Harry B.
Ginsberg Lawrence N.
Hamann H. Fredrick
Mullins James B.
Rockwell International Corporation
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