【摘要】 随机控制可以使载波频率及其整数倍附近的谐波频谱展宽,得到一个均匀连续的频谱,使谐波的幅值得以减少,从而有效地降低电磁噪声。为了防止随机开关频率控制带来的系统震荡现象,本文提出一种扩展随机范围的方法,由多范围小随机组成一个大范围随机,使谐波频谱展宽的范围更大,谐波幅值降低得更多,从而降低电磁噪声的效果更加明显。通过仿真对比分析,验证了新型随机开关频率的正确性及优势。更多还原

【Abstract】 The random control can make carrier frequency and the integer times nearby harmonic frequency spectrum stretcher and get a uniform continuous spectrum to reduce the amplitude of harmonic wave,thus the electromagnetic noise can be effectively reduced.In order to prevent the oscillation of the random switching frequency control system,this paper proposes a method of extended random range,this method that the big range random consists of the more small scope of random,could make the scope of harmonics spectrum wider,and reduce the amplitude of harmonic wave more effectively,so as to reduce the effect of electromagnetic noise more apparently.The correctness and advantages of this new random switching frequency have been proved by the analysis of simulation contrast.更多还原