Oscillatory circuit for an ultrasonic cleaning device with feedb

Details Oscillatory circuit for an ultrasonic cleaning device with feedb Oscillatory circuit for an ultrasonic cleaning device with feedb

1976-10-21

1978-03-28

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4104

Patent

active

040817067

ABSTRACT:
An improved oscillatory circuit in which the output of a radio frequency transformer is coupled from a half bridge squarewave amplifier to piezoelectric ultrasonic transducers through a serially connected feedback network. The feedback network employs a resistance connected in parallel with the serially connected combination of a capacitance, a feedback inductance and a feedback transformer. The improved feedback network provides a variable phase shift in feedback current to the half bridge squarewave amplifier tending to hold the frequency generated therein at a target frequency above anti-resonance.

REFERENCES:
patent: 3293456 (1966-12-01), Shoh
patent: 3432691 (1969-03-01), Shoh
patent: 3681626 (1972-08-01), Puskas
patent: 3842340 (1974-10-01), Brandquist
patent: 3931533 (1976-01-01), Raso et al.
patent: 3975650 (1976-08-01), Payne

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