无电解电容的改进型SEPIC LED照明驱动

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摘要高功率白光LED因其高光效、长寿命、环保及小体积等优点, 已经引起学术界和工业界的广泛关注, 有望成为第四代照明光源。通常LED照明的供电电源除了要求高效率、高功率因数、低成本外, 还必须具有高功率密度。然而作为储能的电解电容不但体积较大, 而且寿命短, 不但影响了电源功率密度的提高而且降低了LED驱动的使用寿命。因此本文在研究分析了现有LED照明驱动的基础上, 提出了一种改进型SEPIC变换器, 并以此为基础, 提出了一种新的LED照明驱动。该LED照明驱动以Twin-Bus Buck变换器作为LED电流调节器, 改进型SEPIC PFC作为预处理级。该驱动在满足输入功率因数不低于0.96时, 消除了电解电容。一台50W的SEPIC PFC的实验样机的测试结果表明了设计的合理性和可行性。

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	马红波
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关键词 ：功率因数, LED, SEPIC, 电解电容, Twin-Bus

Abstract：High brightness lighting emitting diode (HB-LED) has attracted a lot of attention from both industry and academic for its high efficacy, simple to drive, environmentally friendly, long lifespan and small size. Typically, the power supply for LED requires high power density in addition to high efficiency, high power factor and low cost. The size of electrolytic capacitor used as storage capacitor is usually large, but also it has the key drawback with short lifespan. These hamper the improvement on LED lighting products. This paper presents a new proposal of LED lamp driver using the SEPIC-derived converter as PFC pre-regulator with twin-bus output. The SEPIC-derived break the low frequency power loop of the conventional SEPIC converter; therefore SEPIC-derived do not need the large capacity output capacitor to meet the output voltage ripple requirement. The basic operating principle and analysis is introduced in detail. A prototype of a 50W SEPIC-derived has been built and tested to verify the feasibility of the proposed LED lamp driver. The experimental results show that the efficiency is exceeding 92% and power factor is not less than 0.96.

Key words： Power factor LED SEPIC electrolytic capacitor twin-bus

收稿日期: 2010-11-03 出版日期: 2014-03-20

PACS:

TM461.2

基金资助:国家高技术研究发展计划、国家自然科学基金和西南交通大学博士生创新基金资助项目。

作者简介: 马红波男, 1981年生, 博士, 研究方向为LED供电系统、电力电子变换器的建模与控制以及可再生能源供电系统中的电力电子技术。郑聪男, 1985年生, 博士研究生, 研究方向为LED供电系统与可再生能源供电系统中的电力电子技术。

引用本文:

马红波, 郑聪, 余文松. 无电解电容的改进型SEPIC LED照明驱动[J]. 电工技术学报, 2012, 27(6): 139-146. Ma Hongbo, Zheng Cong, Yu Wensong. The SEPIC PFC Without Electrolytic Capacitor for Offline LED Lighting Application. Transactions of China Electrotechnical Society, 2012, 27(6): 139-146.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2012/V27/I6/139

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