An isolated active-clamped single-ended primary-inductor converter (SEPIC) power factor correction (PFC) converter based on SiC devices is presented. The impact of the resonant inductance on the switch voltage stress and range of zero-voltage switching is analyzed. Analytical expressions for the operating points of the switches over the line cycle are derived and used to evaluate the switching loss. Resonant inductance and snubber capacitance are chosen based on the analysis to reduce the switching loss without overstress of the switches. Lossless diode clamp circuits are designed for the output diode so that the peak voltage and extra losses due to device parasitics-induced oscillation are significantly reduced. The analysis is validated with a 2-kW single-phase PFC rectifier module with a peak efficiency of 96.56% at the 200-kHz switching frequency, total harmonic distortion (THD) <; 2%, and power density of 58 W/in ³ .

中文翻译：

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具有SiC器件和无损二极管钳位的高性能有源钳位隔离式SEPIC PFC转换器

提出了一种基于SiC器件的隔离式有源钳位单端初级电感转换器（SEPIC）功率因数校正（PFC）转换器。分析了谐振电感对开关电压应力和零电压开关范围的影响。得出线路周期内开关的工作点的解析表达式，并将其用于评估开关损耗。根据分析结果选择谐振电感和缓冲电容，以减少开关损耗而又不会增加开关的应力。无损二极管钳位电路专为输出二极管而设计，从而可显着降低峰值电压和由器件寄生电感引起的振荡引起的额外损耗。使用峰值效率为96的2kW单相PFC整流器模块验证了该分析。在200 kHz开关频率下为56％，总谐波失真（THD）<; 2％，功率密度为58 W / in ³ 。