电流纹波率分析与输出滤波电感的优化设计  

Analysis of the Current Ripple Ratio and Optimal Design of the Output Inductor

作　　者：伍健[1] 何礼高[1] 付国清 

机构地区：[1]南京航空航天大学,江苏南京210016 [2]宜春广播电视大学,江西宜春336002

出　　处：《电力电子技术》2010年第5期67-69,共3页Power Electronics

摘　　要：一般输出滤波电感的设计需以临界连续电流为依据并根据经验公式选取电流纹波计算。该方法未考虑滤波电感上电流脉动对变换器各应力参数的影响,难以得到较理想的输出滤波电感值,从而影响变换器的实际效果。为解决这一缺陷,深入分析了Buck变换器电流纹波率的选取理论依据,提出输出滤波电感的优化设计。该方法综合考虑了变换器各应力参数、滤波电感的体积及变换器的动态性能,最终确定了电流纹波率最佳值约为0.4,以此计算的滤波电感值未影响到变换器动态响应,其设计获得了优化。实验结果验证了理论分析的正确性和该方法的可行性。The general way to design the output filter inductor is taking the critical discontinue current as the basis,then selecting the inductor current ripple according to the experiential equations to calculate the inductor value.This method neglects the effects of the inductor current ripple on the overall stresses of the converter,it can’t provides ideal output inductor values,so it will affect the actual performance of the converter.In order to solve the shortcom,the theoretical basis for selecting the current ripple ratio of Buck converter is analyzed and an optimal design method of the output inductor is proposed.The overall stresses of the converter,the size of the filter inductor and dynamic performance of the converter are all considered in the proposed method.The optimum value of current ripple ratio is set to about 0.4 finally.The inductance calcultated in terms of the determined current ripple ratio can not affect the dynamic performance of the converter,so the design of the converter is optimized.The correctness of theoretical analysis and the feasibility of the proposed method are verified by the experimental results.

关 键 词：滤波电感 电流纹波率 优化设计 

分 类 号：TN713[电子电信—电路与系统]