基于传输线变压器及补偿电容的噪声分离策略

摘要

Noise separators are wildly used in separating the common mode (CM) and differential mode (DM) signals in conducted electro magnetic interference (EMI) measurements.The high frequency performance of a single phase noise separator is improved.It is realized by a detailed calculation of the impedance characterization of the transmission line transformer.Then an impedance matching capacitance is added at the output terminal of the transmission line transformer.The presented simulation results and laboratory tests validate the effectiveness of the proposed method.%针对电磁干扰(EMI)信号中的共模(CM)频谱和差模(DM)频谱分离技术难点,提出一种基于传输线变压器及补偿电容的噪声分离器.该分离网络利用传输线变压器良好的高频特性,并结合补偿电容的阻抗匹配设计,从而实现了CM和DM噪声的精确分离.对分离器的电路结构及其参数设计进行了深入的探讨,并设计完成了实验样机.通过DC/DC全桥变换器,实验验证了所提出的噪声分离器在CM和DM噪声分离方面的可行性和有效性.