Drive circuits for ultrasonic tooth treatment transducers

Details Drive circuits for ultrasonic tooth treatment transducers Drive circuits for ultrasonic tooth treatment transducers

1978-03-06

1980-01-15

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

318116, H01L 4110

Patent

active

041840925

ABSTRACT:
Ultrasonic tooth treatment apparatus having an electromechanical transducer, such as a magnetostrictive or piezeoelectric transducer, and a generator which drives the transducer, with a control signal derived from a change of current and/or frequency occurring upon loading the transducer. This signal disconnects the generator or reduces its power when a predetermined threshold value is exceeded. The generatory may be readjusted to the actual resonant frequency of the transducer. The transducer may be part of the frequency-determining portion of the generator. The generator supplies a pulse-shaped or sinusoidal signal for driving the transducer. A first signal corresponding to the no-load frequency or the no-load current of the transducer is derived. This first signal is compared to a second signal corresponding to the frequency or current of the transducer under load in a sum-or-difference circuit whose output signal forms the control signal and is compared in a comparison circuit to a signal corresponding to the predetermined threshold value.

REFERENCES:
patent: 3085185 (1963-04-01), Jacke et al.
patent: 3278770 (1966-10-01), Shom
patent: 3434074 (1969-03-01), Libby
patent: 3586936 (1971-06-01), McLeroy
patent: 3668486 (1972-06-01), Silver
patent: 3727112 (1973-04-01), Popescu
patent: 3819961 (1974-06-01), Bourgeois et al.
patent: 3989042 (1976-11-01), Mitsui et al.

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