Achievement of Miniaturized and Inductor-less AC-DC converter Using Mechanical Resonance of Single-Crystal Piezoelectric Small-Thin Rectangular Plate

本研究旨在利用单晶压电式Transformer，实现一小型化、高效率且不需配线的AC-DC转换器。作为分析和测量的结果，已经发现可以实现具有大约95%的非常高的效率的压电Transformer。接下来，为了获得压电Transformer的高性能驱动电路，已经在从大约100 kHz到900 kHz的高频范围内详细检查了MOSFET开关电路的开关特性。此外，测量系统已被构造为精确测量的压电Transformer的性能特性，通过控制不稳定的非线性现象出现在实际的大功率驱动的压电Transformer。

This study aims to achieve a miniaturized and high efficiency AC-DC converter without the wiring, by using the single-crystal piezoelectric transformer. As the results of the analysis and measurement, it has been found that the piezoelectric transformer with very high efficiency of about 95% can be achieved. Next, for obtaining the high-performance driving circuit of the piezoelectric transformer, the switching characteristics of the MOSFET switching circuits have been examined in detail in the high-frequency range from around 100kHz to 900kHz. Moreover, the measuring system has been constructed to measure precisely the performance characteristics of the piezoelectric transformer, by controlling the unstable non-linear phenomena appearing during the practical high-power driving of the piezoelectric transformer.