Study of Variable-Voltage Variable-Frequency Inverter Utilizing Piezoelectric Transformer

• Main Authors: Hsu tayu, 徐達裕
• Other Authors: Jia-You Lee
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/56400880160692196119

碩士 === 國立成功大學 === 電機工程學系 === 88 === In this thesis, piezoelectric transformers (PTs) are applied as frequency modulated device. The instant voltage of the reference input is designed to drive and control the frequency of PT, and the corresponding voltage gain of PT is decided by variable interval of the vibrational frequency. The amplitude of PT’s vibration will be equal to the expected instant output voltage of the VVVF (Variable frequency variable voltage) inverter. In an experiment we hope to use the digital synthesizer to produce a fundamental output, and the fundamental frequency will be equal to the expected frequency. Also the amplitude will be equal to the envelope voltage of the modulated frequency. The synchronous rectifier switches the instant modulating output in the ZVS form. Finally the harmonic component is filtered out by low pass filter and the fundamental sine wave is obtained.