Circuit arrangement for accurately and effectively driving an ultrasonic transducer
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United States of America Patent
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-
Jun 1, 1993
Issued Date -
N/A
app pub date -
Nov 27, 1991
filing date -
Oct 5, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for driving an ultrasonic transducer, intended for use in atomization of liquids, at one of its selected resonance frequencies, by tuning out the capacitance of the ultrasonic transducer by means of an inductor, by sensing the transducer current, by comparing the phases of the transducer driving voltage and the transducer current and by controlling a voltage controlled oscillator for driving the ultrasonic transducer, by means of a phase error signal such that the ultrasonic transducer is driven with a frequency at which the transducer driving voltage and the transducer current are in phase, whereby the transducer driving circuit is locked to a natural resonance frequency of the ultrasonic transducer.
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