Modeling of the Transformer Coupled Self-Oscillator for Piezo Power Driver

The accurate operating frequency of Piezo transducers depends highly on a matching resonant network for the transformer coupled self-oscillator. However it is found that the magnetizing inductance of transformer, forwarding nonlinear gain and even power source probably have important effects on the prediction of the oscillating frequency. Thus, this paper introduces the descriptive function to model the transformer coupled self-oscillating driver for Piezo transducer, and analyze the operating frequency and its change. The reasonability and feasibility of the presented analysis procedure are verified by simulation and experiments based on a Piezo power driver prototype.