Characteristics of electrical matching for power piezoelectric transducer

The characteristics of the electrical matching are the key issues for the applications of the power piezoelectric transducer. This paper proposed a method to evaluate the electrical mismatch between the transducer and the driving signal source, which used an electrical matching circuit with the combination of both the transformer and inductance-capacitance. The characteristics of the electrical matching circuit have been carefully examined by the effects of series inductor, total power and operating frequency on the reflected power. The results show that the designed circuit has a good suitability with changing the value of the series inductor. Moreover, the actual center frequency of the transducer is lower than the tested resonance frequency (50.18 kHz), and it declined from 49.20 kHz to 48.93 kHz with increasing the total power from 8 W to 40 W. The results demonstrate the closely relationships of the reflected power with the series inductor, total power, and operating frequency. This work can provide an experimental reference for applications of the electrical matching circuit for power piezoelectric transducer.