Apparatus for generating ultrasonic signals

Details Apparatus for generating ultrasonic signals Apparatus for generating ultrasonic signals

1988-12-15

1989-12-19

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 71, 331158, 331183, 310316, H03L 706

Patent

active

048885657

ABSTRACT:
An ultrasonic generator, particularly for use in ultrasonic cleaning systems, provides a constant ultrasonic power output for a cleaning tank or chamber. A generator output stage fed from an unsmoothed mains power supply receives signals from an oscillator via a pulse-width modulation circuit. A power control feedback loop monitors the mains current, or alternatively the output signal from the output stage, and provides a compensation signal to the pulse-width modulation circuit. A frequency control feedback loop senses the current in the output from the output stage and tunes the generator for maximum current in this output.

REFERENCES:
patent: 4271371 (1981-06-01), Furuichi et al.

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