一种高效率单级PFC变换器的LED照明驱动电路  

A novel single-stage high-power-factor and high efficiency LED lighting application

作　　者：杨岳毅[1,2] 曾怡达[1] 何林[1] 母才莘[1] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031 [2]郑州铁路职业技术学院机车车辆学院,河南郑州450052

出　　处：《电源技术》2015年第2期372-375,共4页Chinese Journal of Power Sources

基　　金：中央高校基本科研业务费专项资金(SWJTU2011CX-003EM)

摘　　要：提出一种基于Buck-Boost变换器与Flyback变换器有机结合的单级LED驱动电路,通过增加隔离变压器漏感电流流通通路,将漏感能量回馈到输入端,提高了变换器的工作效率,同时消除了开关管电压尖峰,无需RCD吸收电路,改善了电路的EMI（electromagnetic interference）。详细分析了该单级PFC变换器的工作原理,给出了变换器关键参数的设计依据。此外,当Buck-Boost和Flyback同时工作在电感电流断续模式（discontinuous current mode,DCM）时,中间储能电容电压不随负载变化而变化,避免了开关器件因电压飙升而损坏开关管的现象。最后,搭建了交流85－265 V输入、50 V/160 mA输出的原理样机,通过实验验证了分析的正确性。In this paper,a novel single-stage PFC converter, which integrated a Buck-Boost converter with a Flyback converter, was presented applicable for LED lamp driver. The proposed circuit could enhance the efficiency via the innovative structure, which recycled the leakage inductance energy, alleviate voltage spike and ringing on MOSFET without a snubber circuit, improved the electromagnetic interference（EMI） and efficiency. The basic operating principle and analysis was introduced in detail and the circuit parameter was analyzed and calculated. When the Buck-Boost and Flyback worked in Discontinuous current mode（DCM）, the bulk capacitor voltage was unchanged with the load, thus the high voltage stress problem was avoided. A prototype of a 8 W single-stage LED driver was built, and the correctness of theoretical analysis was validated by experiments.

关 键 词：LED驱动电路 功率因数校正 漏感能量回馈 储能电容电压 

分 类 号：TM461[电气工程—电器]