一种新颖的Buck电路设计方法  

A Novel Design Method of Buck Circuit

作　　者：何玮 任堰牛[1] 

机构地区：[1]西南石油大学电气信息学院,四川成都610500

出　　处：《通信电源技术》2017年第5期34-35,38,共3页Telecom Power Technology

基　　金：四川省教育厅自然科学项目(15ZB0046)

摘　　要：Buck电路结构简单,易于实现,应用非常广泛。文章针对连续工作电流的Buck电路,建立了一种便于理论分析的等效电路,基于此电路的频率特性函数和输入信号的傅里叶变换,得到了电路的稳态响应。对纹波的理论研究及仿真分析表明电路输出的纹波比完全可由基波纹波比代替计算,从而提出了一种设计滤波元件L、C参数的不同思路。通过实例设计及仿真验证也说明此方法对Buck电路参数设计是简单有效的,L、C参数的选定也比较灵活。Buck circuit is widely used and easy to implement with simple structure. In this paper,for continuous current mode of Buck circuit,an equivalent circuit which is convenient for theoretical analysis is established and the steady-state response of the circuit is obtained based on the frequency response characteristic of the circuit and the Fourier transform of the input signal. The theoretical study and simulation analysis show that the ripple ratio of the circuit output can be replaced by the base ripple ratio,and a different way of designing the L and C parameters of the filter is proposed. It is proved that this method is simple and effective for buck circuit parameter design through example design and simulation,and the selection of L and C parameters is very flexible.

关 键 词：BUCK电路 频率特性函数 基波纹波比 L、C参数设计 

分 类 号：TM46[电气工程—电器]