两相交错并联Buck变换器集成磁器件多维度建模与多目标优化

doi:10.19595/j.cnki.1000-6753.tces.242241

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Abstract The rapid development of industries such as aerospace, electric vehicles, and green data centers requires low-power, non-isolated buck-switching power supplies to achieve high efficiency, high power density, and lightweight miniaturization. The converter adopts a topology structure of multi-phase interleaved Buck to reduce the current ripple. However, magnetic components usually occupy more than 30% of the total volume of the power supply, which affects the power density and dynamic characteristics of the power output. Power magnetic integration technology has been studied to reduce magnetic components' footprint, volume, and losses and improve switching power supplies’ efficiency.
This paper proposes a multi-dimensional modeling and multi-objective optimization method based on a two-phase interleaved Buck converter for the negative-coupling magnetic devices with improved core structure and winding layout. Firstly, based on the electrical parameter model of the converter and the magnetic circuit characteristics of the negative-coupling inductor, the magnetic core structure and winding layout are improved and optimized. Secondly, multi-dimensional models of the converter are established regarding the winding turns, magnetic column air gap, magnetic column edge length, and switching frequency. Combining the model and constraint conditions, a multi-objective optimization process is designed to obtain non-dominated solutions for the transformer efficiency, magnetic device footprint and volume under different winding turns. Finally, the optimal parameters are selected, and integrated magnetic devices are manufactured.
A 28 V/12 V, 168 W experimental prototype has been built. Compared to independent inductors, the optimized magnetic device had a footprint reduction rate of 45.48%, a volume reduction rate of 43.66%, an increase in the rated efficiency of the converter by 0.9%, and a magnetic device power density of 8 020 W/in³. Simultaneously changing the input voltage of the converter and the air gap of the integrated magnetic device allows the converter to operate under different working conditions. By operating the converter and integrated magnetic devices at different switching frequencies and observing the efficiency of the converter, the feasibility of the multi-objective optimization process can be verified.
The following conclusions can be drawn. The equivalent steady-state inductance should be the same as the independent inductance value to keep the current ripple constant. The new magnetic device extends the magnetic core and plates in the circumferential direction, improving the magnetic shielding performance and reducing interference with other components. Negative-coupling reduces the AC magnetic flux in the magnetic core and offsets the DC magnetic flux in the magnetic plates. It is beneficial for reducing the magnetic plates’ thickness and the magnetic device’s volume, thereby improving the converter’s power density.

Key words： Interleaved Buck converter negative-coupling integrated magnetic device multidimensional modeling multi-objective optimization

Received: 13 December 2024

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	Liu Ze
	Zhou Guohua
	He Yingjie
	Xu Nengmou

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Liu Ze,Zhou Guohua,He Yingjie等. Multidimensional Modeling and Multi-Objective Optimization of Integrated Magnetic Device for Two-Phase Interleaved Buck Converter[J]. Transactions of China Electrotechnical Society, 2025, 40(24): 8039-8051.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.242241 OR https://dgjsxb.ces-transaction.com/EN/Y2025/V40/I24/8039

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