车载充电模块传导骚扰收音机频段的分析及改善
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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.
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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[2] Clayton R. Paul,等.电磁兼容导论[M]. 2版.北京:人民邮电出版社,2017.9.
[3]百度百科w_ou.中国汽车工程学会磁兼容标准[EB/OL]. 2018-06-07/2018-06-22. https://baike.baidu.com/item/%E7%94%B5%E7%A3%81%E5%85%BC%E5%AE%B9%E6%A0%87%E5%87%86/803840? fr=aladdin.
[4]郭运东.传导骚扰超标的几种常用整改方法[J].环境技术,2011(06):36-39.
[5]孙华军,徐钊,熊树,等.开关电源的电磁兼容性设计[J].淮阴师范学院学报(自然科学版),2011,10(01):31-34.
[6] Hanjping. BUCK电路[EB/OL]. 2017-08-01/2018-06-22. https://baike. baidu. com/item/BUCK%E7%94%B5%E8%B7%AF/7280546
[7]黄子平,秦玲,张良,等.含磁芯线圈动态电感计算[J].强激光与粒子束,2007,19(1):125-128.
[8]邓重一.高频开关电源设计中的电磁兼容性问题研究[J].电源世界,2005(06):1561-0349.
[9]电子产品世界.开关电源的EMC技术[EB/OL].2013-05-20/018-06-22.http://www.eepw.com.cn/arti-cle/206281.htm.
[10] e窝疯.磁珠[EB/OL]. 2018-05-30/018-06-22.https://baike.baidu.com/item/%E7%A3%81%E7%8F%A0/4737120?fr=aladdin
[11]开关电源网.大功率开关电源中EMC电路技术讲解分析-中国开关电源网[EB/OL]. 2015-03-13/2018-06-22. http://www. kaiguandianyuan.wang/news/show.php?itemid=59.