摘要
为实现变换器效率、集成磁器件占地面积与体积的共同优化,该文基于两相交错并联Buck变换器,针对改进磁心结构和绕组布局后的异名端耦合磁器件,提出一种多维度建模与多目标优化方法。首先基于变换器电气参数模型和异名端耦合电感磁路特性,对磁心结构与绕组布局进行改进;其次建立变换器关于绕组匝数、磁柱气隙、磁柱边长以及开关频率的多维度模型,结合约束条件设计多目标优化流程,获取不同绕组匝数下变换器效率与磁器件占地面积、体积的非支配解,为磁器件参数设计提供可选范围;最后从工程实际出发选取最佳参数并制作集成磁器件。通过搭建28 V/12 V、168 W的实验样机对集成磁器件以及独立电感进行对比实验,得出优化后磁器件占地面积与体积缩减率分别为45.48%与43.66%,变换器额定效率提高0.9%,磁器件功率密度为8020 W/in3(1 in3=1.63871×10-5m3)的结果,验证了异名端耦合的优越性以及所提方案与设计流程的可行性。
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 8020 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.
作者
刘泽
周国华
何英杰
徐能谋
Liu Ze;Zhou Guohua;He Yingjie;Xu Nengmou(School of Electrical Engineering Southwest Jiaotong University,Chengdu 611756 China)
出处
《电工技术学报》
北大核心
2025年第24期8039-8051,共13页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(62271417)
四川省高效电源变换技术工程研究中心基金项目(2023-02)资助。
关键词
交错并联Buck
异名端耦合
集成磁器件
多维度建模
多目标优化
Interleaved Buck converter
negative-coupling
integrated magnetic device
multidimensional modeling
multi-objective optimization
