Inductance Dual Model and Control of Multiphase Coupled Inductor Buck Converter
Inductance Dual Model and Control of Multiphase Coupled Inductor Buck Converter
复制标题
多相耦合电感降压变换器的电感对偶模型及控制
作者：
Daniel Zhou;Youssef Elasser;J. Baek;C. Sullivan;Minjie Chen
本文提出了一种用于设计多相降压变换器中耦合电感的电感双模型。该模型是多相耦合电感的磁阻模型的拓扑对偶，得到了基于电感的等效电路，并简化了评估瞬态和稳态性能的方程。该模型清晰地将磁性几何结构与集总电路模型联系起来，使SPICE中的耦合关系和磁通量可视化。该模型有利于状态空间和传递函数分析。推导了m相耦合电感降压变换器的动力学方程。结果表明，多相耦合电感降压变换器的占空比与输出电压传递函数等效于单相降压变换器。利用双电感设计可编程耦合电感，调制中心支腿磁阻以提高控制带宽。
This paper presents an inductance dual model for designing coupled inductors in multiphase buck converters. The model is derived as a topological dual of the reluctance model of a multiphase coupled inductor, yielding an inductance-based equivalent circuit with simplified equations for evaluating the transient and steady state performance. The model clearly relates the magnetic geometry to a lumped circuit model, allowing visualization of coupling relationships and magnetic flux in SPICE. The model is conducive to state space and transfer function analysis. The dynamic equations of the M-phase coupled inductor buck converter are derived. It is revealed that the duty ratio to output voltage transfer function of a multiphase coupled inductor buck converter is equivalent to that of a single-phase buck converter. The inductance dual is leveraged to design a programmable coupled inductor that modulates the center leg reluctance to improve the control bandwidth.