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采用耦合电感的交错并联电流临界连续BoostPFC变换器

, PP. 215-224

Keywords: 电流临界连续模式,功率因数校正,交错并联,耦合电感

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Abstract:

电流临界连续模式(CRM)的Boost功率因数校正(PFC)变换器具有输入功率因数高,二极管零电流截止等优点,采用交错并联技术可以有效降低输入电流脉动和输出电容电流有效值,有利于输入滤波器的设计,提升变换器的效率。本文将两路交错并联的CRMBoostPFC变换器的两个独立电感反向耦合,以进一步减小电感的体积和重量。本文首先介绍耦合电感的基本原理,分析耦合电感对变换器开关频率、输入电流纹波已经磁链的影响,然后讨论了满足最低频率限制和电感不饱和的条件下,耦合电感的设计方法。耦合后最低开关频率仍满足要求且电感匝数可以减小。最后进行实验验证。

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