| Summary: | 碩士 === 國立成功大學 === 電機工程學系 === 89 === In this thesis, we purpose to investigate the step-down characteristics and the converse driving technology. They are applied to implement a half bridge resonant adapter by step-up Rosen-type piezoelectric transformers(PT). First of all, one proofs the equivalent circuit model of Rosen-type PT which is applied in the converse operation from piezoelectric equations, and then analyzes the relations among the structure, the equivalent model and some characteristics of PT. The analyzed results show that the voltage gain, the output power, and the efficiency depend on the parameters of structure such as length, width, and thickness. Then we can scheme a PT design flow to fit the special requirements. According to the simulation and the equivalent model, one exercises three different size Rosen-type PTs accompanying with the half bridge resonant circuit and the rectifier circuit to realize the step-down adapter by converse-operation mode Rosen-type PT.
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