Control of oscillator for driving power ultrasonic actuators

Details Control of oscillator for driving power ultrasonic actuators Control of oscillator for driving power ultrasonic actuators

1996-10-25

1998-04-14

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 14, 331 17, 310316, 318116, B06B 106, H03L 700

Patent

active

057397244

ABSTRACT:
An oscillator supplies a signal of adjustable frequency to drive power ultrasonic actuators. The oscillator frequency is varied and the phase between the voltage and current of the signal is continuously measured. A computer determines the sign of the variation in the absolute value of the phase in the course of successive sampling cycles of predetermined duration and produces therefrom frequency correction signals for the oscillator. A frequency correction is applied to the oscillator in the same direction as the frequency correction applied previously if the variation in absolute value of the phase is negative, and in the opposite direction if the variation in absolute value of the phase is positive. If the variation in absolute value of the phase is zero, a frequency correction of random sign is applied to the oscillator.

REFERENCES:
patent: 4808948 (1989-02-01), Patel et al.
patent: 4879528 (1989-11-01), Gotanda
patent: 4970656 (1990-11-01), Lo et al.

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