随机调制技术与频率抖动技术抑制传导EMI的比较

随机调制技术和频率抖动技术两种方法都能解决常规PWM型电力电子系统产生的电磁干扰问题。通过对随机频率调制技术和频率抖动技术两种方法的分析和实验测试，证明了在同样的条件下，随机频率调制方案比频率抖动技术能够更好地减小功率变换器产生的传导电磁干扰，而且，通过适当增加开关频率的随机程度，使变换器输出电压的频谱呈现出更为连续的特性，有利于改进电力电子装置的电磁兼容性。

Comparative Investigation of Randomized Modulation and Frequency Jitter in Restraining Conduct EMI

Randomized modulation and frequency jitter are two ways to reduce conducted EMI in power electronic system.Under same condition, theoretical analysis and experimental results indicate that the randomized carrier frequency modulation technique not only has more effective to restrain EMI than frequency jitter technique,but also is more flexible than frequency jitter schemes with the variable randomized degree.The new scheme leads to a further degree of dispersion of harmonic contents of the output voltage in power converter.