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具有宽负载范围的新型Boost功率因数校正器

, PP. 93-98

Keywords: Boost变换器,伪连续导电模式,负载范围,功率因数

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Abstract:

针对不连续导电模式(DCM)和连续导电模式(CCM)BoostPFC变换器存在负载范围受限的问题,提出了一种工作在伪连续导电模式(PCCM)的新型Boost功率因数校正变换器。分析了PCCMBoost变换器的工作过程,建立了PCCMBoostPFC变换器的大信号模型,在此基础上设计了数字谷值电流控制策略和电压环PI调节器。该变换器可在较宽的负载范围内实现高功率因数。通过一台输出功率范围为70~400W的实验样机,对PCCMBoostPFC变换器和CCMBoostPFC变换器的性能进行了对比和验证。

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