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平均电流控制的BoostPFC变换器最恶劣传导EMI频谱分析

DOI: 10.13334/j.0258-8013.pcsee.2014.06.021, PP. 982-992

Keywords: 传导电磁干扰,EMI频谱,EMI滤波器,功率因数校正,平均电流控制,BoostPFC变换器

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Abstract:

平均电流控制的BoostPFC变换器可能工作于电感电流在半个工频周期内全连续、部分断续和全断续的模式,且不同工作模式下,变换器的传导EMI频谱存在差异。为了分析变换器的最恶劣传导EMI频谱并简化EMI滤波器的设计,首先给出变换器不同工作模式的输入电压和负载条件,并给出开关管漏源极电压的波形。通过分析开关管漏源极电压的各次谐波幅值特性指出,传导EMI开关频率基波的最恶劣情况出现在电感电流全连续的工作模式下,其它次谐波的最恶劣情况出现在负载较轻的条件下。

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