Design, Analysis and Optimization of Magnetic-Core Solenoid Inductor for On-Chip Multi-Phase Buck Converter
Design, Analysis and Optimization of Magnetic-Core Solenoid Inductor for On-Chip Multi-Phase Buck Converter
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DOI：
10.1109/access.2023.3281359
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发表时间：
2023
期刊：
影响因子：
3.9
通讯作者：
Maliha Elma;M. Vemuri;Umamaheswara Rao Tida
中科院分区：
文献类型：
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作者：
Maliha Elma;M. Vemuri;Umamaheswara Rao Tida
由于异构集成，对片上DC-DC转换器的需求增加，以提供多个电压域用于系统的有效操作。为此，基于平面磁芯的电感器由于其用于片上降压转换器实现的增加的电感密度而获得普及。为了保证变换器的正常工作，磁芯不应该饱和，电感的过度设计会显著降低变换器的效率。而且，磁芯面积预算对于片上设计是有限的。本文提出了一个优化框架，设计一个有效的多相降压变换器与磁芯螺线管电感给定的规格。我们调查两个成本函数的优化，成本函数1只考虑降低功耗，而成本函数2同时考虑功耗和电感器的足迹。商业工具上的全波仿真表明，优化后的多相降压变换器在负载电流为500 ~mA$时，成本函数1和成本函数2的效率分别达到88.13%和88.06%。与具有成本函数1的优化电感相比，具有成本函数2的优化电感的尺寸减小了10%。
Due to heterogeneous integration, there is an increased demand for on-chip DC-DC converters to provide multiple voltage domains for efficient operation of the system. Towards this, planar magnetic-core based inductors gained popularity due to their increased inductance density for on-chip buck converter realization. To ensure proper operation of the converter, the magnetic-core should not saturate, and over-design of the inductor decreases the converter efficiency significantly. Also, the magnetic-core area budget is limited for on-chip design. This paper proposes an optimization framework to design an efficient multi-phase buck converter with the magnetic-core solenoid inductor for the given specifications. We investigate two cost-functions for optimization where Cost function1 considers only power loss reduction, whereas Cost function2 considers both power loss and inductor footprint. Full-wave simulations on commercial tool show that the optimized multi-phase buck converter with $500~mA$ load current achieves 88.13% and 88.06% efficiency for Cost function1 and Cost function2, respectively. The footprint for the optimized inductor with Cost function2 has a 10% reduction compared with the optimized inductor with Cost function1.