摘要
通过对影响传导骚扰因素的分析,针对USB充电模块现有设计进行整改,已达到目前比亚迪汽车工业有限公司传导骚扰实验要求。详细分析车载USB电源原理及控制方法。通过机理分析找出电路中产生传导骚扰源位置,同时研究磁珠选型及特性,通过实验数据验证磁珠在消除传导骚扰源的效果。发现电源输入、输出端的滤波处理对于整产品的EMI骚扰影响较大,有效降低EMI骚扰从而消除对收音机频段的影响。
Through the analysis of the factors affecting conductive disturbance, the current design of USB charging module has been modified, which has met the current requirements of conductive disturbance experiment of BYD Automobile Industry Co., Ltd. The principle and control method of on-board USB power supply were analyzed in detail. The location of conductive disturbance source in the circuit was found through mechanism analysis, and the selection and characteristics of magnetic beads were studied. The effect of magnetic beads in eliminating conductive disturbance source was verified by experimental data. It is found that the filter processing of power input and output has great influence on the EMI disturbance of the whole product, which can effectively reduce the EMI disturbance and eliminate the influence on the radio frequency band.
引文
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