A Novel PCB-Embedded Coupled Inductor Structure for a 20-MHz Integrated Voltage Regulator
A Novel PCB-Embedded Coupled Inductor Structure for a 20-MHz Integrated Voltage Regulator
复制标题
DOI：
10.1109/jestpe.2022.3194133
复制
发表时间：
2022-12
影响因子：
5.5
通讯作者：
Feiyang Zhu;Qiang Li
中科院分区：
文献类型：
--
作者：
Feiyang Zhu;Qiang Li
随着便携式电子产品中处理器的功率需求不断增长，处理器的电压调节器 (VR) 预计将变得高效且小型化。与分立式 VR 解决方案相比，集成稳压器 (IVR) 可以非常靠近处理器放置，以支持动态电压和频率缩放，这有助于显着降低处理器的功耗。 IVR 面临的主要挑战之一是高频电感器的开发。本文提出了一种具有简单磁芯结构的新型负耦合电感器结构。所提出结构的耦合系数可以通过改变电感器绕组图案来调整，而无需修改磁芯结构。详细分析了耦合调整方法和磁芯内磁通分布。提出了一种多相集成电感器，以通过磁通消除进一步增强电感器性能。印刷电路板 (PCB) 嵌入式四相电感器的设计、制造和测试频率为 20 MHz。该器件将四个电感器集成到一个磁芯中，电感密度为 9.7 nH/mm3，每相直流电阻 (DCR) 为 3.1 $\text{m}\Omega $，厚度为 0.54 mm，具有高电流处理能力。
As power demands of processors in portable electronics continuously grow, the voltage regulator (VR) for the processor is expected to be efficient and miniaturized. Compared with a discrete VR solution, the integrated voltage regulator (IVR) can be placed very close to the processor to support dynamic voltage and frequency scaling, which helps significantly reduce the power consumption of the processor. One of the major challenges for IVRs is the high-frequency inductor development. This article proposes a novel, negative-coupled inductor structure with a simple core structure. The coupling coefficient of the proposed structure can be adjusted by changing the inductor winding pattern without modifying the magnetic core structure. The method for adjusting the coupling and the flux distribution in the magnetic core are analyzed in detail. A multiphase integrated inductor is proposed to further enhance the inductor performance by flux cancellation. A printed circuit board (PCB)-embedded four-phase inductor is designed, manufactured, and tested at 20 MHz. The device integrates four inductors into a single-piece magnetic core, featuring an inductance density of 9.7 nH/mm3, a dc resistance (DCR) of 3.1 $\text{m}\Omega $ per phase, and a thickness of 0.54 mm with high current-handling ability.