Implementation Of An AC-DC High step-down Converter With Power Factor Correction

• Main Authors: Chen, Wei-Jia, 陳威嘉
• Other Authors: Yang, Lung-Sheng
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/8989wg

碩士 === 遠東科技大學 === 電機工程研究所 === 105 === This thesis investigates an AC-DC high step-down converter with power factor correction. The proposed converter integrates an AC-DC buck-boost converter with a switched-inductor DC-DC converter by using single switch. The front semi-stage of the proposed converter is utilized for power factor correction. The rear semi-stage of the proposed converter is used for high step- down voltage conversion. Two inductors with same inductance are employed in the rear semi-stage of the proposed converter. The two inductors are series to store the energies at the switch ON-interval. The two inductors are parallel to release the energies at the switch off-interval. Thus, high step-down voltage conversion is achieved. Also, the operating principles and steady-state analyses are described. Finally, a prototype circuit is implemented in the laboratory to illustrate the performance of the proposed converter.