Ultrasonic oscillation circuit

Details Ultrasonic oscillation circuit Ultrasonic oscillation circuit

1988-08-30

1989-11-07

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 15, 331 25, 331 65, 331158, 310316, H03L 710, H03L 712, G05D 1902

Patent

active

048795283

ABSTRACT:
A circuit for generating a driving signal for an ultrasonic vibrating element including a voltage controlled oscillator for generating an oscillation signal which is supplied to the ultrasonic vibrating element as the driving signal, a phase difference detector for detecting a phase difference between the voltage and the current of the driving signal to produce a control voltage corresponding to the detected phase difference, said control voltage being applied to a control input of the voltage controlled oscillator, a comparator for comparing the control voltage from the phase difference detector with a reference voltage to generate an output signal when the control voltage exceeds the reference voltage, and a voltage setter for responding to the output signal to reset the oscillation frequency of the voltage controlled oscillator to a predetermined frequency which is lower than the optimum resonance frequency so that the ultrasonic vibrating element is energized in the most efficient manner.

REFERENCES:
patent: 4703213 (1987-10-01), Gasler

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