关键词: 单级变换器, 功率因数校正(PFC), 数字控制, TMS320F28335

Abstract: In allusion to the requirement of low voltage DC power supply, which is used for LED illuminating in underground mine, a single-stage AC-DC rectifier is designed.The rectifier can achieve high power factor and galvanic isolation. This paper analysis the basic operation principle firstly, discusses the distortion of input current waveform when using the traditional unit power factor control strategy. Then, this paper proposes a novel control strategy eliminating the distortion of waveform. Finally, the validity of the proposed control strategy is verified through the simulation results and experimental results.