Optimal design of piezoelectric transformer for high efficiency and high power density

The characteristics of piezoelectric transformer, such as resonance frequency, matching impedance, electro-mechanical coupling coefficient and efficiency, are analyzed using the finite element analysis along with the equivalent circuit. The validity of the proposed numerical methods is conformed experimentally. Through all of the verified results, the optimal design for a high efficiency and high power density is determined using the multi-modal optimization algorithm based on an evolution strategy.