Modeling and Characterization of Radial-mode Disk-type Piezoelectric Transformer for AC/DC Adapter

For characterization of the newly developed radial-mode disk-type piezoelectric transformer (PT) for ac/dc adapter applications, the closed-form solution of the wave equation, including a loss model for the PT design, was obtained without FEM tools and used to build the electrical equivalent circuit model. The constructed model can be used with the circuit analysis program to predict the operating characteristics of the piezoelectric transformer in the target system. The optimal design procedure of the PT to meet the circuit operation requirements is also presented. The design procedure and the model was verified by experimental data using the prototype PT sample