应用于多相电压调节器的单元耦合与矩阵组合的阵列式集成电感

集成电感对多相电压调节模块(VRM)稳态和动态特性有重要影响,合理的耦合度可以提高VRM的输出动态响应,并能够降低每一通道的稳态纹波。提出一种利用小电感单元进行矩阵组合的阵列式集成电感,分析电感集成原理,给出阵列式集成电感的单元位置拓扑和单元组合结构拓扑,并分析自感互感单元匝比和磁阻比与电感耦合度的关系。通过电路方程推导了多相VRM耦合电感的等效稳态与暂态电感,获得多相VRM集成电感耦合度的设计准则。耦合度范围对比表明,所提出的阵列式集成电感的集成耦合度与设计准则完全一致。利用设计准则设计四相阵列式集成电感,实验样机测试结果验证了设计准则的正确性。将实验样机应用于四相VRM,实验结果表明应用阵列式集成电感的VRM具有良好的稳态和动态特性,证明了所提出的阵列式集成电感具有实用性。

Array Integrated Inductor with Unit Coupling and Matrix Combination Used in Multiphase Voltage Regulator Module

Integrated inductor has important effects on steady-state and dynamic characteristics of multiphase voltage regulator module (VRM). Reasonable coupling degree can improve the output dynamic response of VRM and reduce the steady-state ripple of each channel. An array integrated inductor with a small inductor unit for matrix combining was proposed, and its inductance integration principle was analyzed. The unit position topology and unit combination topology of the array integrated inductors were designed. Regarding the self-inductance and mutual-inductance units, this paper also analyzed the relationship of coupling degree of the coupled inductors with the turn ratio and magneto resistive ratio. Expressions of equivalent steady-state inductance and transient inductance of multiphase VRM coupled inductors were derived using circuit equations, and the coupling degree design criteria of multiphase VRM integrated inductors were obtained. The comparisons show that the coupling degree of the proposed array integrated inductors is in complete accordance with the design criteria. Four-phase array integrated inductor was designed using the design criteria put forward in this paper. The test results of the experimental prototype verified the design criteria. Moreover, the experimental prototype was applied in four-phase VRM, and the experimental results show that VRM using array integrated magnetic inductors has well steady-state and dynamic characteristics. The practicality of the array integrated inductor was verified.