AC/DC Converter Utilizing Round-Shaped Multi-Layer Piezoelectric Transformer with Insulation Layer

• Main Authors: Hung-Chiao Wu, 吳宏蛟
• Other Authors: Jia-You Lee
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/61297122937279731925

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 93 === 　The purpose of this thesis is to present a piezoelectric transformer based AC/DC converter for small power electronic products, which need compact volume. Since AC/DC converters are required to conform to safety regulation. For this reason, the piezoelectric transformer would need to insert an insulation layer between input and output parts to achieve electrical insulation. Furthermore, the output voltage of the AC/DC converter is to be regulated by pulse width modulation control. The proposed AC/DC converter was individually discussed with Class-D half-bridge resonant circuit, rectifying circuit and control circuit. As a result, the AC/DC converter was implemented. Experimental result of the AC/DC converter, the highest efficiency of 72% was obtained at an input voltage of AC 100V~120V, output voltage of 9V, load current of 0.3A~1A, and operating at frequencies of 117 kHz.