分段寻优混沌扩频降低车载LLC谐振变换器电磁干扰  

Reducing electromagnetic interference in vehicle mounted LLC resonant converters by segmentation seeking chaotic spread spectrum

作　　者：张浩杰 杨文荣[1,2] 栾君玲 陈国航 Zhang Haojie;Yang Wenrong;Luan Junling;Chen Guohang(College of Electrical Engineering,Hebei University of Technology,Tianjin 300130,China;State Key Laboratory of Reliability and Intelligence of Electrical Equipment Co-constructed by Province and Ministry,Hebei University of Technology,Tianjin 300130,China)

机构地区：[1]河北工业大学电气工程学院,天津300130 [2]河北工业大学省部共建电工装备可靠性与智能化国家重点实验室,天津300130

出　　处：《电子测量技术》2023年第18期45-53,共9页Electronic Measurement Technology

基　　金：国家自然科学基金(51877066);河北省自然科学基金(E2022202187)项目资助

摘　　要：车载电子测量设备由于电磁干扰会产生误动作或失灵现象,传统混沌扩频可以从源头上降低车载LLC谐振变换器的电磁干扰,但随着扩频宽度的增加会造成输出电压纹波增大、效率降低问题。基于此,首先通过网格多涡卷蔡氏系统生成混沌序列,以向左扩频的方式实现了混沌扩频。其次提出以电磁干扰抑制量变化率以及扩频宽度变化率为判据的分段遍历寻优算法,结合带高频寄生参数的传导干扰预测模型,对国标规定不同频段进行扩频宽度的寻优,根据寻优结果提出了差、共模干扰的分段最优扩频宽度调制策略。最后仿真与实验结果能验证所提出的策略能实现最大7.07 dB电磁干扰降低,减少最大61.5%输出电压纹波,并实现电路效率的提升。Due to the electromagnetic interference,the on-board electronic measuring equipment will cause malfunction or malfunction.The traditional chaotic spread spectrum can reduce the electromagnetic interference of the on-board LLC resonant converter from the source,but with the increase of the spread spectrum width,the output voltage ripple will increase and the efficiency will decrease.Based on this,firstly,the chaotic sequence is generated by a lattice multi-vortex chua's system,and the chaotic spread spectrum is realized in the way of leftward spread spectrum.Secondly,proposing a segmental traversal optimization algorithm with the rate of change of electromagnetic interference rejection and the rate of change of spreading width as the criterion,combine the prediction model of conducted interference with high-frequency parasitic parameters,and perform the spreading width optimization for different frequency bands specified in the national standard.Finally,the simulation and experimental results verify that the proposed strategy can achieve the maximum 7.07 dB EMI reduction,the maximum 61.5%output voltage ripple reduction,and the circuit efficiency improvement.

关 键 词：混沌扩频 扩频宽度 LLC谐振变换器 电磁干扰 

分 类 号：TP93[自动化与计算机技术]