A Method for Parameter Extraction of Piezoelectric Transformers

A methodology for obtaining the parameter´s values of a linearized piezoelectric transformers model is proposed. The suggested technique treats the piezoelectric transformer as an all electrical two port and relies on measurement of the electrical transfer function magnitude and phase of a loaded piezoelectric transformer. Only a single test setup is required to establish all six piezoelectric transformer´s parameter´s values. Neither manufacturer´s data nor acoustical measurements are required. The proposed approach employs the least-squares method for tuning the model parameter´s values. This paper presents the theoretical foundation of the proposed method validated by experimental results. Excellent agreement is found in between the measured and the modeled transfer functions.