Study of DC-DC Converters Utilizing Annular-Type Piezoelectric Transformer

• Main Authors: Liang-Hsiang Chiu, 邱良祥
• Other Authors: Jia-You Lee
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/y298dn

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 90 === When the piezoelectric transformer (PT) applies to DC-DC converters, it always uses thickness vibration mode PT for low impedance load. Because the structure and manufacture of the above-mentioned PT is complex and there are patent problems in business, this thesis adapts simpler Annular-Type PT in structure and manufacture to study DC-DC converters. First of all,the PT equivalent circuit and characteristics is introduced. And uses Spice and Matlab to simulate and analyze. Later it uses the half bridge resonant circuit to drive the PT. A control strategy for DC-DC converters based on phase detector circuit. The control always tracks transformer resonance frequency. Voltage regulation is achieved by adopting the pulse width modulation technique. Eventually, it will achieve the purpose of higher output efficiency.