摘要
在负载变化范围较小的前提下,为提高Buck变换器输出电压精度和电压纹波,在传统Buck变换器拓扑结构基础上,引入多相交错并联磁集成技术。详细分析磁集成条件下,变换器在占空比0-1范围内的相电感电流纹波、四相电感总输出电流纹波、电压纹波与磁耦合系数的关系,确定磁集成变换器占空比与磁耦合系数的最佳选择范围。提出磁集成变换器小信号建模一般方法,并设计出基于FPGA的数字控制器。制作四相交错并联磁集成Buck变换器实验样机,通过实验验证了理论分析的正确性。
Under the premise of a small load change range,multiphase interleaved magnetic-integrated technology is applied to the traditional Buck converter topology to improve the resolution and reduce the ripple of the converter＇s output voltage.The relationships between the phase-inductor current＇ s ripple,the total four-phase-inductor current＇s ripple and voltage ripple with the magnetic coupling coefficient are analyzed in detail when the duty cycle changes from 0 to 1.Then the optimum range of the magnetic coupling coefficient and duty cycle can be determined.Small signal modeling method about magnetic-integrated converter is proposed,and FPGA digital controller is designed.Buck converter experimental prototype is built,and experiments validate the theoretical analysis.
出处
《测控技术》
CSCD
2015年第11期139-143,共5页
Measurement & Control Technology
关键词
多相交错并联磁集成
BUCK变换器
磁耦合系数
小信号建模
FPGA
multiphase interleaved magnetic-integrated
Buck converter
magnetic coupling coefficient
small signal modeling
FPGA
