Analysis and Implementation of a High-Performance Power Supply with PFC

• Main Authors: Keng-Yi Chou, 周庚毅
• Other Authors: 歐勝源
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/83439087907194384624

碩士 === 國立臺北科技大學 === 電力電子產業研發碩士專班 === 99 === This thesis focuses on the design and implementation of a high-performance power supply with power factor corrector (PFC). The front-stage is a Boost PFC operating in continuous-conduction mode (CCM) and the post-stage is a half-bridge series-resonant DC-DC converter to regulate the output voltage. The implemented topology is simple and light, and it has high power density. Moreover, the parasitic components on switches and transformer are used to act as the resonant elements for zero-voltage-switching to reduce switching loss and improve efficiency. The implemented half-bridge series resonant converter uses constant duty cycle and variable frequency control. The leakage inductance and magnetizing inductance of the used transformer, parasitic components on switches and resonant capacitor achieve the desired zero-voltage-switching. A suitable air gap on transformer is designed for deciding the required leakage inductance to replace the resonant inductor so that cost can be reduced and power density can be increased respectively. Finally, a 500W power supply with constant voltage output is implemented to confirm the feasibilities of the analysis and design.