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电动汽车开关电源电磁兼容优化设计方法

, PP. 225-231

Keywords: 电动汽车,变换器,电磁兼容,寄生参数,建模,电磁干扰抑制措施

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Abstract:

针对电力电子设备严重的电磁兼容问题,分析得出功率器件对地的寄生电容是影响共模干扰传播的主要因素,采用有限元法和静电场原理建立了寄生参数的计算模型,并推导出了计算方法,通过基于控制寄生参数大小的方法提出了变换器系统电磁干扰的优化设计方法。实验结果表明,通过增大功率器件导热片与散热器之间导热硅脂的厚度,能够增大开关器件对地的寄生阻抗,使得传播到变换器电源线上的电磁干扰降低,从而提高变换器系统的电磁兼容性。

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