Impedance matching for underwater piezoelectric transducers using piezoelectric transformer

Impedance matching transformer is used to match the output impedance of the corresponding signal source to maximize the power transfer to the load. Design of impedance matching circuit by converting series circuit into parallel equivalent circuit is given. Instead of using conventional electromagnetic transformer, piezoelectric transformer is used. The piezoelectric transformer is treated as two port electrical circuit and electrical transfer function is measured by exciting the transformer at resonant frequency. Impedance matching theory is used to analyze the circuit in this paper. Theoretical considerations of the impedance matching using piezoelectric transformer are given. Using data of some piezoelectric transformers, their impedance matching parameters are calculated for parallel configuration, which can be used for design of a perfect matching circuit.