Implementation of a Single-Stage Buck-Boost-Forward Converter with Power Factor Correction

• Main Authors: Yu-YaoChang, 張譽耀
• Other Authors: Hong-Tzer Yang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/46803120977772488055

碩士 === 國立成功大學 === 電機工程學系 === 102 === Generally, an AC-DC power converter is composed of a power factor correction stage and a DC-DC converter stage. It can achieve high input power factor with input current harmonic meeting the standards. However, it increases the circuit design complexity and component number. A single-stage buck-boost-forward converter with power factor correction is presented. The front stage is a buck-boost type power factor correction to have high input power factor. With configuration of buck-boost type, the voltage stress on the storage capacitor between two stages can be reduced. The second stage is a forward converter to regulate output voltage, and the power density can be increased without the third winding of transformer. By using fuzzy control, the performance of the converter can be enhanced. The converter operates in discontinuous conduction mode can achieve zero current switching on diodes to alleviate the reverse recovery problem. The operation principles, steady-state analysis, design guidelines of the converter are presented in the thesis. In order to verify the effectiveness of the converter, a 100 W prototype with 110 Vrms line input and output voltage of DC 48 V has been implemented. The simulation and experimental results verify the theory and performance of the single-stage converter.