AC to DC Converter with High Power Factor and Fast Response

• Main Authors: Deng-Her Wu, 吳登和
• Other Authors: Tsorng-Juu Liang
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/76721230693315096792

碩士 === 國立成功大學 === 電機工程學系 === 88 === In this thesis, the output voltage equations for boost and flyback converters operated at discontinuous conduction mode are derived. It is shown that the output voltage of the converter is a function of the duty cycle and the switching frequency. As a result, a variable frequency control method is proposed to improve the dynamic response of AC/DC converters while maintaining a high power factor. The proposed method does not require current sensing, and thus reduces the cost of the converter. Experimental test results for both boost and flyback converters confirm the validity of the proposed scheme.