图腾柱PFC变换器轻载性能优化控制策略研究
Research on Light-Load Performance Optimization Control Strategy for Totem-Pole PFC Converter
摘要: 图腾柱功率因数校正(PFC)变换器凭借高效率的优势而被广泛应用于中大功率开关电源领域。然而，随着负载的降低，变换器的断续导电模式(DCM)运行区域会持续扩大，电流回流到输入侧引发额外损耗和总谐波失真(THD)显著加剧，最终造成变换器效率明显下降。针对连续导电模式下图腾柱PFC变换器在轻载工况下THD恶化与效率下降的关键问题，提出了一种基于调频策略与CCM/DCM模式切换的复合控制方法。该方法通过动态调节开关频率，有效减小轻载工况下的DCM运行区域面积；同时在DCM运行阶段选择性导通同步整流功率器件，抑制负电感电流引发的额外损耗。为验证所提控制策略的有效性，通过MATLAB/Simulink仿真平台构建实验模型并开展验证。仿真结果表明：该控制方法可将20%轻载工况下的THD显著降至13%以下，变换器效率有效提升3.27%。
Abstract: Totem-pole power factor correction (PFC) converters are widely used in medium- and high-power switching power supplies due to their high efficiency. However, as the load decreases, the converter’s discontinuous conduction mode (DCM) operating region continues to expand, causing current backflow to the input side, resulting in additional losses and significantly increased total harmonic distortion (THD), ultimately leading to a significant decrease in converter efficiency. To address the critical issues of THD degradation and efficiency degradation in continuous conduction mode totem-pole PFC converters under light-load conditions, a hybrid control approach based on frequency modulation and CCM/DCM mode switching is proposed. This approach effectively reduces the DCM operating region under light-load conditions by dynamically adjusting the switching frequency. Furthermore, during DCM operation, the synchronous rectifier power devices are selectively turned on to suppress the additional losses caused by negative inductor current. To verify the effectiveness of the proposed control strategy, an experimental model was constructed and tested using the MATLAB/Simulink simulation platform. Simulation results show that this control approach significantly reduces THD to below 13% under a 20% light-load condition, effectively improving converter efficiency by 3.27%.
文章引用：岳杉杉, 李政林. 图腾柱PFC变换器轻载性能优化控制策略研究[J]. 电路与系统, 2025, 14(4): 92-103. https://doi.org/10.12677/ojcs.2025.144010

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