Abstract
该文提出了一种前馈电流控制的斜坡补偿方法，将该方法引入到临界导通Boost 功率因数校正(PFC)转换器的设计中，以减小零交越失真问题，改善谐波电流和频率对系统的限制。基于临界导通Boost PFC转换器的拓扑结构，理论分析了前馈电流控制斜坡补偿技术对脉冲宽度调制(PWM)信号占空比的调制作用，推导出补偿斜率与输入线电压的关系式，迫使线电压零交越点附近的电流跟随电压变化。仿真和测试结果表明，该方法可有效抑制零交越失真现象，提高系统的动态性能，尤其在高频及轻负载情况下。测得Boost PFC转换器的总谐波失真(THD)仅为3.8%，功率因数0.988，负载调整率3%，线性调整率小于1%，效率达到97.3%。有效芯片面积为1.611.52 mm2。
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