无Y电容开关电源的EMI抑制方法研究  

EMI Suppression Method for Switching Mode Power Supply without Y-Capacitor

作　　者：邹梅[1] 张华[1] 

机构地区：[1]中南民族大学电子信息工程学院,湖北武汉430074

出　　处：《通信电源技术》2012年第5期26-28,32,共4页Telecom Power Technology

摘　　要：在要求低漏电流的电子设备中使用的开关电源不能采用Y电容,但无Y电容的开关电源往往难以通过EMC测试。文中通过分析开关电源中造成电磁干扰问题的原因和解决方法,提出利用吸收电路来抑制无Y电容情况下开关电源的电磁干扰。测试表明,这种方法可以有效解决无Y电容的开关电源中EMI问题。The Y-capacitor cannot be adopted in the switching mode power supplies for the electrical devices requiring very low leakage current.However,the switching mode power supply without Y-capacitor cannot pass the EMC test.The circuit theory of EMI problems and the EMI suppression method in the switching mode power supply are analyzed in the paper,and then a RC snubber circuit is proposed to suppress the EMI in the switching mode power supply without Y-capacitor.The experiments verify that this method can effectively resolve the EMI problems in switching mode power supply without Y-capacitor.

关 键 词：开关电源 EMI EMC Y电容 吸收电路 

分 类 号：TN86[电子电信—信息与通信工程] TN97