Applying Novel Synchronously-Rectified Two-Transistor Mutiple-Output Flyback Converter to LED Drive

• Main Authors: Sheng Chan Lin, 林聖展
• Other Authors: Kuo-Ing Hwu
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/n74969

碩士 === 國立臺北科技大學 === 電機工程系研究所 === 100 === In this thesis, a novel synchronously-rectified two-transistor multiple-output Flyback converter is presented, which is applied to driving the LED. Based on the proposed synchronous rectifiers stacked with each other on the primary side, the power, which is not dissipated in the load at the high output voltage terminal, will be pumped to the load at the low output voltage terminal, so as to make output voltages proportional to individual turns ratios regardless of variations in load. By doing so, the cross regulation between output voltages will be reduced as minimum as possible. Moreover, the main switch on the primary side will possess zero voltage switching (ZVS). By applying this converter to feeding the multiple loads of the LED TV, one non-isolated boost converter, traditionally required to control the LED current, will be removed such that the required components will be reduced and the efficiency of the power supplies for the LED TV will be upgraded. By means of some experimental results, the effectiveness of the proposed topology can be verified.