Design and Performance Test of Phase Controlled Dual-frequency Ultrasonic Power

Abstract

Dual-Frequency (DF) ultrasonic can eliminate the standing wave, and significantly enhance the effect of cavitation compared with single frequency ultrasonic when it is applied to the medium. Frequency and phase difference of DF ultrasonic are the important parameters to influence the effect of cavitation. The synchronous control method of DF signal generator module was studied. The power amplifier and driving circuits were designed and the feedback circuits based on the maximum current searching method was researched. The DF ultrasonic power supply with adjustable frequency and phase difference as well as DF drive at the same time was developed. The output performances of the DF ultrasonic supply were tested. The results show that the output signal waveforms of DF power supply are stable, the output frequencies are accurate, and the errors of phase difference and automatic searching frequency are less than 1% and 0.3% individually.