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具有快动态响应和低输出电压纹波次型BoostPFC变换器

, PP. 249-257

Keywords: 二次型Boost变换器,功率因数校正,不连续导电模式,输出电压纹波,快速动态响应

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Abstract:

为了提高功率因数校正(PowerFactorCorrection,PFC)变换器对负载变化的动态响应性能,同时消除输出电压二倍工频纹波,本文将二次型Boost变换器应用于PFC变换器中,并分析了其工作原理。根据主电路电感的工作模式,可以将二次型BoostPFC变换器的工作区域划分为四个区域CCM-CCM、CCM-DCM、DCM-CCM和DCM-DCM,本论文重点研究了二次型DCM-DCMBoostPFC变换器的输出电压纹波特性及其动态性能。研究结果表明,与传统DCMBoostPFC变换器相比,二次型DCM-DCMBoostPFC变换器可消除输出电压的二倍工频纹波,降低输入电感电流峰值,且提高了负载动态响应速度,极大地降低了输出电压超调量与跌落量。最后,通过实验结果验证了理论分析的正确性。

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