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功率变换器多开关状态下的传导电磁干扰预测

, PP. 176-183

Keywords: 功率变换器,传导电磁干扰,多开关状态,预测

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Abstract:

针对一个周期内多开关状态的功率变换器,建立基于IGBT模块的等效噪声源模型,并提出分区域的方法预测其传导电磁干扰,建立一个涵盖整个交流输出周期内不同负载电流水平的噪声源模型的集合。分析一个开关周期内由各个开关脉冲引起的传导干扰噪声的关系,一个交流输出周期内总的噪声通过频域内的叠加来获得。保持传播路径一致的情况下,将整个交流输出频率信号划分成4个区域,在每个区域内,传导干扰噪声用相应的噪声源模型计算,一个交流输出周期内的噪声通过4个区域内的结果联合计算得出。实验和仿真结果表明,预测结果有较好的精确度,可以实现整个传导干扰频段内的电磁干扰噪声预测。

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