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断续模式单电感双输出Buck功率因数校正变换器

, PP. 62-70

Keywords: Buck,功率因数校正,单电感双输出,断续模式,单级结构

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Abstract:

传统多路输出功率因数校正(PFC)变换器多由前级PFC变换器级联多个DC-DC变换器的两级变换组成,成本高、体积大。提出了一种单级变换的单电感双输出(SIDO)BuckPFC变换器及其控制策略,并分析了其工作特性。通过对电感的分时复用控制,实现了两个输出支路的独立控制。电感电流工作在断续模式(DCM),消除了各路的交叉影响,相对于传统两级变换的多路输出PFC变换器,减少了控制器与电感的数量,降低了变换器的体积与成本,并提高了变换器的效率。实验结果验证了此变换器高效率、高功率因数以及两个输出支路的高输出准确度控制特性。

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