A Single-Stage Single-Switch LED Driver Based on the Integrated SEPIC Circuit and Class-E Converter

作者：Wang, Yijie^*; Huang, Jiaoping^*; Shi, Guangyao^*; Wang, Wei^*; Xu, Dianguo^*

来源：IEEE Transactions on Power Electronics, 2016, 31(8): 5814-5824.

DOI：10.1109/TPEL.2015.2489464

• Discontinuous conduction mode
• LED driver
• single stage
• single switch
• soft-switching characteristics

A novel high-power-factor single-stage single-switch light-emitting diodes (LEDs) driver for street lighting system is proposed in this paper. By integrating the single-ended primary-inductor converter (SEPIC) power factor correction circuit and Class-E resonant dc/dc converter, the proposed converter exhibits extreme simplicity and high reliability, as there is only one active power switch. The LED driver could achieve nearly a unit power factor by operating the SEPIC circuit at discontinuous conduction mode. With careful parameters design of a single Class-E resonant converter, the proposed converter can achieve soft-switching characteristics, which could significantly reduce the switching losses and greatly improve the system efficiency. Operational principle, analytical results, and design considerations at 100 kHz are presented, and a 100-W laboratory prototype is proposed to verify the theoretical analysis, whose efficiency is as high as 91.2% in full-load state under 110 VAC input.

• 出版日期2016-8
• 单位哈尔滨工业大学