基于集成三端口变换器的无电解电容LED驱动

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摘要电解电容是影响AC-DC LED驱动电源寿命的主要元件,因此,消除电解电容技术是长寿命LED驱动电源的关键技术。将Flyback变换器与Buck变换器集成,提出一种无电解电容LED驱动电源拓扑结构,其具有较高的拓扑集成度,且控制方式易实现。通过将输入功率p_in和输出功率p_o分为p_in>p_o和p_in<p_o两种情况,避免了整机能量的二次变换,通过第三端口的储能电容充电和放电平衡p_in和p_o之间的低频脉动功率。分析了该拓扑结构的工作原理及开关模态,详述了主电路关键参数的设计思路和要点,并给出了简单易实现的控制电路。最后通过一台原理样机验证了该方案的正确性和可行性。

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	汪飞
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关键词 ： LED驱动电源, Flyback变换器, 无电解电容, 三端口变换器

Abstract：The electrolytic capacitor is the key component that limits the lifetime of AC-DC light-emitting diode (LED) driver.Therefore,how to eliminate the electrolytic capacitor in LED drivers is a key problem.In this paper,an electrolytic capacitor-less LED driver which is integrated by Flyback converter and Buck converter was proposed.The driver is highly integrated with simple control.In the proposed circuit,the relationship between input power(p_in) and output power(p_o) was divided into two modes: p_in>p_o and p_in<p_o,in order to avoid double energy conversion.The low-frequency pulse power was balanced by the energy-storage capacitor of the third port which is done by charge and discharge.Parameter design of the main circuit was addressed following the analysis of operating principle and switching-modes,as well as the control circuit.Finally,a prototype was built to verify the correctness and effectiveness of the driver.

Key words： LED driver Flyback converter electrolytic capacitor-less three-port converter

收稿日期: 2015-06-17 出版日期: 2016-12-26

PACS:

TM46

基金资助:国家自然科学基金项目(51107078)和上海市教育委员会科研创新项目(15ZZ043)资助。

作者简介: 汪飞男,1981年生,博士,副教授,研究方向为新能源发电与微电网技术、电能质量控制技术、固态照明驱动。E-mail:f.wang@shu.edu.cn(通信作者)钟元旭男,1988年生,硕士研究生,研究方向为LED照明驱动电源、AC-DC变换器以及DC-DC变换器。E-mail:zhongyuanxu@shu.edu.cn

引用本文:

汪飞 ,钟元旭, 李林, 阮毅. 基于集成三端口变换器的无电解电容LED驱动[J]. 电工技术学报, 2016, 31(23): 189-198. Wang Fei, Zhong Yuanxu ,Li Lin ,Ruan Yi. An Electrolytic Capacitor-Less LED Driver Based on an Integrated Three-Port Converter. Transactions of China Electrotechnical Society, 2016, 31(23): 189-198.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I23/189

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