Research Initiation: Combined Thermal-Magnetic Model for Design of High-Frequency Power Transformers

兆赫范围内的开关频率正被用于 开发下一代计算机的电源， 其他应用。 Transformer内部发热 磁芯与频率、局部磁场强度和 材料性能 最低核心体积要求高- 频率设计受到磁芯损耗和热考虑的限制， 但是目前还不存在用于设计优化的方法。 这个项目 考虑了热磁耦合机制， 用于Transformer设计热传递。 通用有限元模型 功率Transformer的功率因数，该功率因数考虑了 温度场、磁场、几何形状和材料特性 将被开发。 该模型将通过一个电子 能量平衡，以确定核心和绕组损耗，并通过红外 利用热成像技术绘制出原型高温 变频电源变压器 拟议的研究将改善设计工具， 高频磁性 这项工作预计将首次显示 磁场和热场之间的耦合对 设计优化 这项工作还将展示性能 通过改善远离热交换器的热传递可获得的增益 Transformer和由此导致的温度水平降低。 先前 工作完全忽略了传热增强。 结果 这项研究将使工业进一步推进电力 电子技术

Switching frequencies in the megahertz range are being used in the development of power supplied for the next-generation computers and other applications. The internal heat generation in a transformer core is proportional to frequency, local magnetic field strength and material properties. The minimum core volume required for a high- frequency design is limited by core loss and thermal considerations, yet no method for design optimization currently exists. This project considers the mechanisms of thermal-magnetic coupling and enhanced heat transfer for transformer design. A generic finite-element model of a power transformer that accounts for coupling between the temperature field, magnetic field, geometry and material properties will be developed. The model will be validated by an electrical energy balance to determine core and winding losses, and by infrared thermal imaging to map the surface temperatures of prototype high- frequency power transformers. The proposed research will improve the design tools available for high-frequency magnetics. This work is expected to show for the first time the impact of coupling between the magnetic and thermal fields on design optimization. This work will also demonstrate the performance gains obtainable through improved heat transfer away from the transformer and the resulting decrease in temperature level. Previous work has neglected heat transfer enhancement altogether. The results of this research will allow industry to further advance power electronics technology.