中山大学学报自然科学版 ›› 2016, Vol. 55 ›› Issue (1): 75-79.doi: 10.13471/j.cnki.acta.snus.2016.01.013

• 研究论文 • 上一篇    下一篇

Buck变换器输入/输出滤波相关问题研究

陈 鸣1,李舒然1,陈方林2   

  1. 1.中山大学太阳能系统研究所∥广东省光伏技术重点实验室, 广东 广州 510006;
    2.广东易事特电源股份有限公司,广东  东莞 523803
  • 收稿日期:2014-12-19 出版日期:2016-01-25 发布日期:2016-01-25
  • 通讯作者: 陈鸣(1960年生),男;研究方向 :电力电子技术及控制;E-mail:chenming@mail.sysu.edu.cn

The input and output filtering of Buck converter

CHEN Ming1, LI Shurang1,CHEN Fanglin2   

  1. 1.Solar Energy System Institute∥Guangdong Province Key Lab of Photovoltaics Technologies, Sun Yatsen University, Guangzhou 510006,China;
    2. Guangdong East Power Limited Company, Dongguan 523803,China
  • Received:2014-12-19 Online:2016-01-25 Published:2016-01-25

摘要:

论述了中大功率Buck变换中,输入电容滤波的电流纹波计算问题和输出的LC滤波器存在的谐振电压问题。在输入电容方面,通过仿真、计算推导了纹波电流的较为确切的公式,指出其最大纹波电流发生之处;通过结合Buck实验电路的LC滤波器的各项参数,如电感的等效电阻,以及电容的等效串联电阻等,对实验出现的谐振电压问题的进行理论分析,同时进行Matlab仿真,观察其输出响应,并通过加入阻尼的方法进行消除震荡,此法简单效果明显,通过软件仿真和实验进行了验证。

关键词: Buck电路, 输入电容, LC滤波器, Matlab仿真, 谐振电压

Abstract:

The calculation of ripple current in input capacitor and the resonant voltage of output LC filter in high power buck converter is described. In regard to input capacitor, an accurate formula of calculating ripple current is derived through simulation and deduction, and the maximum ripple current point is stated. Theoretical analysis of the resonant voltage problem occurring in experiments is conducted using certain parameters in a LC filter model, such as inductor equivalent resistance and capacitor ESR. Also a Matlab simulation is conducted to observe its output response characteristics and a damper is added to eliminate resonance. This simple and effective method is verified by simulation and experiment.

Key words: Buck converter, input capacitor, LC filter, Matlab simulation, resonant voltage

中图分类号: