Study of An Asymmetrical Half-Bridge Power Converter with Green Mode

• Main Authors: Wei-Shuo Tseng, 曾偉碩
• Other Authors: Sheng-Yuan Chu
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/67501657313271212028

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 91 === The requirements of environmental protection and energy saving on electronic products are more and more stringent, and thus it is important for engineers to reduce the energy losses in the electronic products. This thesis studies and implements an AC/DC power converter with very low power losses during stand-by period. The main circuit topology includes power factor correction circuit and an asymmetrical half-bridge converter with synchronous rectifier to obtain high power factor and high efficiency at full load condition. The power consumption can be reduced at no load conduction by disable the power factor correction circuit and synchronous rectifier. In addition, the pulse skip scheme is used to reduce the loss in the asymmetrical half-bridge converter. Experimental results show that the converter can achieve 88% efficiency at full load condition. Also, the power losses can be reduced to about 1W during stand-by condition.