传导噪声分析仪在汽车电子EMC中的应用

摘要

The mechanism of conducted EMI noise and the characteristics of different modal noise are analyzed in this paper. In order to overcome the difficulty that the traditional method of conducted EMI noise measurement can＇ t diag- nose the EMI noise comprehensively, the conducted noise analyzer is introduced. And its structure and principles are analyzed in detail. In addition, the issue of the conducted noise of a certain type of car navigation system is diagnosed by using it, and the corresponding EMI filter is designed to suppress the conducted EMI noise. The result of experiment verifies the validity of the diagnosis of the conducted noise analyzer.%介绍了传导噪声产生的机理以及不同模态噪声的特点.为了克服传统传导噪声测量方法难以对噪声进行全面诊断的缺点,引入了传导噪声分析仪,在介绍了它的结构和原理的同时,针对某型车载导航仪的传导噪声超标问题进行了诊断分析,设计了相应的EMI滤波器对其传导干扰噪声进行抑制,实验测试结果验证了传导噪声分析仪诊断的有效性.