具有ZVS和电流共享功能的单级高功率因数LED驱动器

Chien-Hsuan Chang, E. Chang, Hung-Liang Cheng, Fang-Ying Liu
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引用次数: 0

摘要

本文提出了一种具有零电压开关(ZVS)和电流共享特性的单级高功率因数LED驱动器。降压升压型功率因数校正器(PFC)与LLC谐振dc-dc转换器集成形成所述电路。两个有源开关都可以用ZVS打开,两个输出整流二极管都可以用零电流开关(ZCS)关闭。通过采用多个变压器并将其初级绕组串联起来,可以自然地实现LED通道的电流共享。所提出的单级变换器具有电路结构简单、直流母线电压低、系统可靠性高等特点。介绍了该变换器的工作原理和电路分析。最后,给出了实验室样机的实验结果,验证了理论预测的有效性和所提电路的可行性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Single-stage high-power-factor LED driver with ZVS and current-sharing features
This paper proposes a single-stage, high-power-factor LED driver with zero-voltage-switching (ZVS) and current-sharing features. A buck-boost typed power-factor corrector (PFC) is integrated with an LLC resonant dc-dc converter to form the presented circuit. Both the active switches can turn on with ZVS, and both the output rectifier diodes can turn off with zero-current-switching (ZCS). The current sharing of LED channels is achieved naturally by employing multiple transformers and connecting their primary windings in series. The proposed single-stage converter has the features of simple circuit structure, low dc-bus voltage, and high system reliability. Operation principles, and circuit analysis of the proposed converter are addressed. Finally, the experimental results of a laboratory prototype are provided to verify the validity of the theoretical predictions and the feasibility of the proposed circuit.
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