Matrix Coupled All-in-One Magnetics for PWM Power Conversion
Matrix Coupled All-in-One Magnetics for PWM Power Conversion
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DOI：
10.1109/tpel.2022.3194418
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发表时间：
2022-12
影响因子：
6.7
通讯作者：
Ping-Jian Wang;Daniel H. Zhou;Youssef Elasser;J. Baek;Minjie Chen
中科院分区：
文献类型：
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作者：
Ping-Jian Wang;Daniel H. Zhou;Youssef Elasser;J. Baek;Minjie Chen
本文研究了矩阵耦合的“一体化”磁结构，它结合了串联耦合和并联耦合的脉宽调制（PWM）功率转换。系统地分析了电流涟漪减小机理。讨论了不对称串联耦合绕组间的电流涟漪控制问题。矩阵耦合电感器的瞬态性能被揭开神秘面纱，为分析转换器动态特性及其大信号或小信号建模提供见解。为了量化矩阵耦合的优点，通过比较矩阵耦合电感器与给定相同瞬态速度的分立电感器的电流涟漪来定义品质因数。比较结果表明，更高的相位数和更强的矩阵耦合系数放大矩阵耦合的好处。设计并测试了一个输入电压为1 V ~ 5 V、输出电压为1 V ~ 5 V、四相矩阵耦合的同步SEPIC变换器。矩阵耦合SEPIC原型可以支持高达185 A的负载电流，5 V至1 V电压转换，最大功率密度超过470 W/in$^\text{3}$。与商用分立电感相比，矩阵耦合电感的尺寸小5.6倍，瞬态速度快8.5倍，电流涟漪和额定电流相似。实验结果验证了矩阵耦合的概念和理论分析，打开的可能性，走向广泛采用的“所有在一个磁”的PWM拓扑结构。
This article investigates the matrix coupled “all-in-one” magnetic structure that combines both series coupling and parallel coupling for pulse-width modulated (PWM) power conversion. A systematic analysis of the current ripple reduction mechanism is performed. Current ripple steering among asymmetric series coupled windings is discussed. The transient performance of the matrix coupled inductor is demystified, providing insights for analyzing converter dynamics and its large- or small-signal modeling. To quantify the benefits of matrix coupling, a figure of merit is defined by comparing the current ripple of a matrix coupled inductor to that of a discrete inductor given the same transient speed. The comparison results indicate that a higher number of phases and a stronger matrix coupling coefficient amplify the benefits of matrix coupling. A 1 V-to-5 V input, 1 V-to-5 V output, four-phase matrix coupled synchronous SEPIC converter with planar PCB integrated magnetics is built and tested. The matrix coupled SEPIC prototype can support load current up to 185 A at 5 V-to-1 V voltage conversion with a maximum power density over 470 W/in$^\text{3}$. Compared to commercial discrete inductors, the matrix coupled inductor has a 5.6 times smaller size and 8.5 times faster transient speed with similar current ripple and current rating. The experimental results validate the matrix coupling concept and the theoretical analysis, opening the possibilities toward wide adoption of ‘‘all-in-one-magnetics” in PWM topologies.