功率LED替代灯的新颖谐振式Buck镇流器

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摘要 LED灯发光效率高, 寿命长, 因此具有巨大的应用前景, 并有望取代白炽灯。LED灯是低压电流型器件, 需要LED镇流器(驱动电路)将公共电网的高压交流电转换为适合LED的低压直流电。为了保证整个LED照明系统具有高效率和长寿命, LED镇流器必须具有以上特性。相比于采用变压器降压, 无变压器的降压变换器可以达到更高的效率, 但此类变换器, 如Buck变换器, 在低占空比时要承受长时间的二极管续流, 导通损耗大, 效率低。因此, 本文提出一种新颖的谐振式Buck镇流器, 利用谐振可实现高电压转换比, 转换效率高, 工作时间长, 且可以与已有的白炽灯调光器配合工作, 可直接安装在白炽灯具上。实验结果证明了该镇流器的有效性, 且成本低, 适合于目前LED替代灯场合。

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	曲小慧
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关键词 ： LED镇流器, 无变压器型变换器, 谐振式, LED替代灯

Abstract：LEDs are potential successors of incandescent lamps with high luminous efficacy and long lifetime. To improve the overall luminair efficacy and lifetime, the power efficiency and lifetime of LED ballasts become important factors. Efficiency gain in transformer-less power converters appears attractive for applications without isolation. Driving solid-state LED bulbs in an existing lighting ﬁxture from universal mains necessitates a high voltage step-down ratio in order to produce a relatively low output voltage suitable for LED lighting applications. Traditional non-isolated step-down Buck converters may suffer from poor efficiency due to the long diode freewheeling time at small duty cycles. In this paper, a resonance assisted Buck converter is proposed to achieve a high voltage step-down ratio and high converter efﬁciency, whilst maintaining durability and compatibility with existing incandescent dimmers. The performance of the proposed LED driver is veriﬁed experimentally.

Key words： LED ballast transformer-less converter resonance assisted LED replacement lamps

收稿日期: 2010-11-06 出版日期: 2014-03-20

PACS:

TM923

基金资助:国家自然科学基金(51107009)和教育部博士点基金(20090092120042)资助项目。

作者简介: 曲小慧女, 1981年生, 讲师, 主要从事LED照明系统、功率因数校正技术及谐振变换器的研究。Siu Chung Wong 男, 1961年生, 副教授, 研究方向包括功率变换器建模及非线性现象分析、LED照明系统等。

引用本文:

曲小慧, SiuChungWong, ChiKongTse, 张建忠. 功率LED替代灯的新颖谐振式Buck镇流器[J]. 电工技术学报, 2012, 27(4): 159-165. Qu Xiaohui, Siu Chung Wong, Chi Kong Tse, Zhang Jianzhong. Resonance Assisted Buck Converter for Offline Driving of Power LED Replacement Lamps. Transactions of China Electrotechnical Society, 2012, 27(4): 159-165.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2012/V27/I4/159

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