A Transducer Matching Method with Signal Frequency and Inductor Adjustment Combined for Submerged Structure Ultrasonic Cleaning

The application of ultrasonic cleaning for submerged structure is more common, but the resonant frequency of piezoelectric transducer is changed when it is heat at work. The traditional matching method cannot adapt the serial resonance frequency of capacitance branch and dynamic tuning is inefficient. We proposed a transducer matching method with signal frequency and inductor adjustment combined. The technique of identifying true max current value and Phase Locked Loop frequency tracking was used. The automatic tracing of frequency is realized by searching the max current value, and working current was exceeding the threshold of 0.9Imax. The adjustment of inductor was decided by phase comparison and impedance matching was achieved finally. By combining experimental study with theoretical analysis, the feasibility of this dynamic matching method was verified.This method have important significance for improving submerged structure ultrasonic cleaning efficiency.