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External filter design based on AC-DC switching power supply
Author(s): 
Pages: 8-10
Year: Issue:  6
Journal: Electronic Measurement Technology

Keyword:  switched-mode power supplyripplepeak pulse noisefiltering;
Abstract: 为设计较稳定恒流源,基准电压噪声幅值要求控制在20 mV以内.开关电源模块普遍存在纹波与尖峰脉冲噪声干扰,其实质由差模干扰与共模干扰引起.通过对某L系列开关电源测试,了解其噪声频率分布与幅值分布情况,研究并设计出相应的抑制电路,由结果分析得到最有效的滤波方式.电路设计旨在简单有效地抑制2种主要噪声,利用LC无源滤波电路即能将噪声控制在12 mV左右.经试验发现,该设计方法对其他开关电源同样有显著的抑制效果.
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