Circuit arrangement for accurately and effectively driving an ul

Details Circuit arrangement for accurately and effectively driving an ul Circuit arrangement for accurately and effectively driving an ul

1989-10-05

1992-05-12

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

318116, H01L 4108

Patent

active

051131161

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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patent: 4939402 (1990-07-01), Hirayama et al.
patent: 4970656 (1990-11-01), Lo et al.

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