占空比及相位差对开关功放电流纹波影响分析  

Impact Analysis of Duty-ratio and Phase Difference to Current Ripple of Switching Power Amplifier

作　　者：李配飞 张磊[1] 翟小飞[1] 

机构地区：[1]海军工程大学舰船综合电力技术国防科技重点实验室,武汉430033

出　　处：《船电技术》2014年第1期1-4,共4页Marine Electric & Electronic Engineering

基　　金：国家自然科学基金项目(51077129);国家高技术研究发展(863)计划(2011AA040301)

摘　　要：本文结合H半桥开关功放的工作原理,在两路PWM相位差和占空比均变化的情况下分析了励磁电流纹波变化情况,并通过理论分析给出了两路PWM实现电流纹波最小时的占空比和移相角度所满足的条件。基于开关功放在励磁系统中的应用,构建了一个励磁电流闭环控制系统,Matlab仿真和实验结果均证明了理论分析的正确性,较好地实现了对励磁电流的精确控制,并减小了电流纹波。Combined with the principle of H half-bridge switching power amplifier （SPA）, the current ripple is analyzed in PWM duty-ratio-changing and phase-shifiing. The appropriate conditions of duty-ratios and phase shift of the PWM signals to achieve minimum current ripple are obtained through theoretical analysis. An excitation current closed-loop control system is built based on the practice of SPA in exciter system, the results of simulator in Matlab and experiment prove the accuracy of above academic analysis. This method enables exact control of the exciter current and low current ripple.

关 键 词：高占空比PWM 开关功放 最小电流纹波 

分 类 号：TM311[电气工程—电机]