Study and Implementation of Half Bridge Resonant Power Supply with Synchronous Rectifier and Active Power Factor Correction

• Main Authors: Jen-Kai Hsu, 徐振凱
• Other Authors: 王仲淳
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/20657025426138551773

碩士 === 元智大學 === 電機工程學系 === 95 === This thesis presents results of study and implementation of half bridge resonant power supply with active power factor correction. First, active power factor correction approach was discussed to rectify the wave form distortion of bridge current and realize high power factor and low current harmonic. Afterward, it gave a stable high quality dc voltage input for half bridge resonant power supply. Second, half bridge resonant power supply could achieve Zero Voltage Switching (ZVS) in the switching process to reduce power losses. When the fixed frequency control was used for tracking the resonant frequency, this process also helped keep the system operated at the optimal condition. Then, synchronous rectifier (SR) the MOSFET used to substitute for the Schottky that is to rectify in the secondary side. This method been to reduce power loses on the components of the secondary side of circuit. Finally, the realizations of power supply system was implemented, measured and analyzed under load variations. The power supply was operated under 90Vac~264Vac input voltage range and 24Vdc / 10A was measured as an output. The experimental results showed that an optimum efficiency of proposed system can reach up to 90.52% at the input voltage of 230Vac.