A new design of the high-power ultrasonic generator

Recently, in the field of ultrasonic cleaning, most ultrasonic generators suffers from the deficiencies of low and unstable output, no automatic frequency tracking and short service life. This paper introduces a 2kW generator which has the functions of output signal automatic tracking between 10 to 20 kHz and over-temperature protection. This generator is comprised of a full-bridge IGBT power converter, a digital PWM control circuit and a feedback control circuit of temperature and current. The results show that the ultrasonic generator is stable, powerful and efficient. © 2008 IEEE.