Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular frequency control means
Patent
1984-12-13
1985-11-05
LaRoche, Eugene R.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular frequency control means
331117R, 331181, 310316, H03L 700
Patent
active
045516901
ABSTRACT:
An automatic tuning circuit is provided for adjusting the frequency and phase of an oscillatory circuit in a power supply used for providing high frequency electrical energy to an electroacoustic converter. The oscillatory circuit includes an electrically variable inductance means in a feedback loop coupled between the output and an input of the oscillatory circuit and a switching device. The phase relationship of a signal indicative of the voltage across the switching device and a signal indicative of the state of the switching device and hence the current through the switching device is monitored. The inductance of the variable inductance means is adjusted responsive to the phase relationship of the signals indicative of voltage and current through the switching device for maintaining the two signals in phase during operation of the oscillatory circuit.
REFERENCES:
patent: 3263184 (1966-07-01), French et al.
patent: 3432691 (1969-03-01), Shoh
patent: 3946280 (1976-03-01), Quist
patent: 4371816 (1983-02-01), Wieser
Branson Ultrasonics Corporation
Feig Philip J.
LaRoche Eugene R.
Pascal Robert J.
Steinberg Ervin B.
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