Study of Novel Soft-switching Technologies Used in Single Phase Isolated PFC AC-DC Converter

• Main Authors: Kuan-Hui Fang, 方冠輝
• Other Authors: Jia-You Lee
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/81856898456075148251

碩士 === 國立成功大學 === 電機工程研究所 === 82 === Traditionally,the AC-DC converter used a passive rectifier, add large capacitor,but it will produce an amount of input current harmonics,These large input current harmonics will make not only the power factor but also the power quality is poor,so in this thesis will use a average current mode control to make the unity power factor,and use a feedforward method make the output voltage has a better dynamic response when the input voltage various.For safty ,in the proposed converter a isolated high frequency transformer is used.In this thesis ,the proposed converter used a boost type push- pull converter to achieve our goal.For increasing the efficiency a novel soft-switching technologies is used to reduce the switching losses.Finally,a single-phase 1KVA push-pull boost converter is setup to verify the predicted and analyzed result. The experimental result show that the proposed push-pull converter has unity power factor, high power conversion efficiency,small size,light weight,low THD,low EMI and fast transient response.