Covidien LP

Xiaosen Liu

James A Gilbert

Daniel A Friedrichs

Keith W Malang

Edgar Sanchez-Sinencio

Adrian I Colli-Menchi

Adrian Colli-Menchi

An ultrasonic motion generator includes a non-resonant inverter, an ultrasonic transducer, and a comparator. The non-resonant inverter inverts direct current (DC) to alternating current (AC) having a first frequency. The ultrasonic transducer is electrically coupled with the non-resonant inverter and generates an ultrasonic motion based on the inverted AC. The comparator automatically detects a deviation of the first frequency from a resonant frequency of the ultrasonic transducer based on motion current passing through the ultrasonic transducer and generates an output signal based on the deviation to drive the non-resonant inverter.

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College Station, TX, United States of America

Xiaosen Liu