摘要
针对传统固定频率PWM控制方式引起的输入电流谐波幅值较大,频谱能量较为集中的缺点,基于频率调制理论,分析了频率抖动技术扩散输入电流频谱的基本原理;结合传统的PWM控制器,实现了一种简单的频率抖动方法。该方法可降低变换器的输入电流低次谐波幅值,从而改善了EMI的低频传导特性。实验结果验证了该方法的正确性。
Larger amplitude of the harmonic with a concentrated-energy spectrum of the input current is expected in a constant frequency PWM-based converter.Based on the theory of frequency modulation, the principle that frequency jittering spreads the spectrum of the input current is analyzed.Then a simple method to realize the frequency jittering combined with the conventional PWM regulator is adopted.The amplitude of the lower order harmonics of the converter input current is suppressed ,which improves the lower frequency characteristic of conducted EMI.Experimental result was derived to verify this method.
出处
《电力电子技术》
CSCD
北大核心
2007年第12期14-15,19,共3页
Power Electronics
关键词
变换器
电磁干扰/频率抖动
频率调制
converter
electromagnetic interference/frequency jitter
frequency modulation
