Title: Ultrasonic generator drive circuit

Abstract: The ultrasonic generator comprises a transducer which is adapted to vibrate in a fundamental frequency mode and the harmonics thereof in response to a square wave signal which is applied thereto. The transducer is of the piezoelectric type which has a capacitor loading effect. A square wave generator is provided for generating a square voltage wave and driving means comprising high speed switching transistors is responsive to the signal from the square wave generator for driving the transducer with a square wave. The transistors are switchable between conducting and non-conducting states and are connected to the square wave generator so that the transistors are switched in phase opposition to each other. A non-resonant inductor connects the pair of transistors with the transducer to limit current flow and to permit application of the square wave to the transducer. An alternate embodiment utilizes a balancing transformer to eliminate the normal high common mode switching current.

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Other info:

Inventors: Payne, Stephen C. (Charleston, WV, US)

Application Number: 545463
Filing Date: 1975-01-30
Publication_date: 1976-08-17
Assignee:
Primary Class(es): 310/316.01 318/116
Other Classes:
US Patent Ref:

2752512	Jun, 1956	Sarratt	310/8.
3371233	Feb, 1968	Cook	310/8.
3432691	Mar, 1969	Shoh	310/8.
3443130	May, 1969	Shoh	310/8.
3489930	Jan, 1970	Shoh	310/8.
3581125	May, 1971	Arndt	310/8.
3676720	Jul, 1972	Libby et al.	310/8.
3681626	Aug, 1972	Puskas	310/8.
3736523	May, 1973	Puskas	310/8.
3819961	Jun, 1974	Bourgeois et al.	310/8.
3842340	Oct, 1974	Brandquist	310/8.

Other Refs:
Primary Examiner: Budd, Mark O.
Assistant Examiner:
Attorney: Burgess, Dinklage & Sprung