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.
出处
《通信电源技术》
2012年第5期26-28,32,共4页
Telecom Power Technology
关键词
开关电源
EMI
EMC
Y电容
吸收电路
switching mode power supply
EMI
EMC
Y-capacitor
snubber circuit
