Patent ID: 8115366
Filing Date: 2012-02-14
Classification: B06B

Abstract:
1. A system for driving an ultrasonic transducer, the system comprising: a controller adapted to provide a voltage and a frequency, the controller configured to vary the voltage based on a current error signal derived from a drive current through a transducer and from a current command, the controller configured to vary the frequency based on at least one parameter indicative of whether the transducer is at or near a resonance state; and a drive adapted to receive the voltage and the frequency from the controller, and adapted to provide a drive voltage at a drive frequency to the transducer based on the voltage and the frequency received from the controller, the drive voltage being at a level that maintains the drive current at substantially the current command, the drive frequency being at substantially a resonant frequency of the transducer, wherein the at least one parameter includes a phase angle between the drive current and the drive voltage.