基于磁粉芯的小型化磁耦合VRM设计*

doi:10.16628/j.cnki.2095-8188.2024.06.005

摘要/Abstract

摘要：

针对传统采用铁氧体磁芯的电压调节模块(VRM)耦合电感体积较大的问题,采用饱和磁密更大的磁粉芯作为磁芯材料,减小磁件体积,提出基于磁粉芯的VRM耦合电感设计方案和流程。最后,依据设计参数搭建了1台磁耦合VRM样机,样机模组部分的电流密度达0.5 A/mm²,电感总高度仅5 mm,性能良好。实例验证所提方案和设计流程正确有效,能实现VRM耦合电感的小型化和低截面。

关键词: 电压调节模块, 磁耦合, 磁粉芯, 电感

Abstract:

In response to the large volume problem of the traditional voltage regulation modules (VRM)coupling inductance using ferrite magnetic cores, the magnetic powder cores with higher saturation magnetic density are used as the magnetic core materials to reduce the volume of magnetic components. The design scheme and process for VRM coupling inductance based on magnetic particle cores are proposed. Finally, based on the design parameters, a magnetic coupled VRM prototype is built. The current density of the prototype module reached 0.5 A/mm², the total height of the inductor is only 5 mm, and the performance is good. The proposed scheme and design process are verified to be correct and effective through the practical examples. The miniaturization and low cross-section of VRM coupled inductors can be achieved.

Key words: voltage regulation modules(VRM), magnetic coupling, magnetic powder cores, inductor

中图分类号:

TM45

张彬意, 杨祺欣, 毛行奎. 基于磁粉芯的小型化磁耦合VRM设计^*[J]. 电器与能效管理技术, 2024, 0(6): 31-36.

ZHANG Binyi, YANG Qixin, MAO Xingkui. Design of Miniaturized Magnetic Coupled VRM Based on Magnetic Powder Core[J]. LOW VOLTAGE APPARATUS, 2024, 0(6): 31-36.

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参考文献 16

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材料	Kool Mu	MPP	High Flux	XFlux
合金成分	铁硅铝	铁镍钼	铁镍	铁硅
磁芯损耗/(mW·cc^-1) @60 μ,100 kHz	550	450	625	1 280
饱和磁密/T	1.0	0.8	1.5	1.6
频率响应/MHz@60μ	5	6	3	3

参数类型	参数值
输入电压/V	6
输出电压/V	1
输出电流/A	50 ~250
相数/相	8
开关频率/kHz	750
功率模组部分的电流密度/(A·mm^-2)	0.5

参数类型	参数值
稳态等效电感/nH	50
占板尺寸/mm	8×6.5
稳态最大有效值电流/A	40
暂态最大瞬时值电流/A	110
线圈电流密度/(A·mm^-2)	25

参数	数值	参数	数值
整体尺寸/ mm	6.5×8×5	稳态最大电流/A	40
自感/nH	51.3	暂态最大电流/A	110
互感/nH	-13.6	耦合系数	-0.26
磁芯中柱截面/mm	2.6×4.0	绕组截面/mm	3.5×0.5
磁芯边柱截面/mm	1.75×4.0	磁芯材料	铁镍 (μ_r=60)

参数类型	参数值
MOS管	MP86972
主控制器	ZYNQ7020
总输入电容/mF	1.4
总输出电容/mF	5.6