Dentsply International Inc.

Dentsply Sirona Inc.

Michael C Dietrich

Peter H Werner

Clifford Krapfl

Jeremy J Kile

David J Kierce

Jill C Denna

Thomas Mitchell

Kenneth R Guaragno

Ilya Kovnatsky

David C Klunk

Meghan E Anderson

A method for controlling a magnetostrictive ultrasonic transducer of the type used in a magnetostrictive ultrasonic dental scaler includes generating a drive signal for a resonant circuit using a full bridge synchronous class D amplifier. The electrical signal output by the resonant circuit drives an excitation coil that generates an electromagnetic field that causes the magnetostrictive ultrasonic transducer to vibrate. A feedback wire is rendered unnecessary by measuring current and voltage outputs of the resonant circuit and quadrature sampling the measured current and voltage outputs at the same sampling rate as used for the generation of the electrical signal by the resonant circuit. A pulse width modulated signal is generated from the quadrature sampled sensed current and voltage that represents a pulse train approximation of a sine wave of the drive signal for, in turn, being applied to the full bridge synchronous class D amplifier to generate the drive signal for the resonant circuit. Changes in the pulse widths of the pulse train change the amplitude of the drive signal.

2-wire ultrasonic magnetostrictive driver

Display for dental scaler

Dental scaler with display

Growing community of inventors

East Petersburg, PA, United States of America

Michael C Dietrich