This article introduces a thermally-compensated magnetic hysteresis model, capable of accurately determining core losses of ferrite materials while accounting for core temperature variations. The employed model is based on permeance-capacitance analogy and it captures the frequency-independent hysteresis effect with the help of the Preisach model. For validation purposes, a 100 kW, 10 kHz realized medium frequency transformer prototype is selected and modeled as a part of a full-bridge LLC resonant converter in a time-domain simulation environment. Conducted simulations show the ability of the thermally-compensated magnetic hysteresis model to impact the generated core losses for core temperatures of up to 120 $^{\circ }$ C. Finally, a temperature-feedback loop within the transformer is successfully closed inside of a system-level simulation, allowing for a more precise determination of the core and winding steady-state temperatures.

中文翻译：

---

用于电路时域仿真的热补偿磁芯损耗模型

本文介绍了一种热补偿磁滞模型，该模型能够在确定铁心温度变化的同时，准确确定铁氧体材料的铁心损耗。所采用的模型基于磁导率-电容相似性，并借助Preisach模型捕获了频率无关的磁滞效应。为了进行验证，选择了一个100 kW，10 kHz实现的中频变压器原型，并在时域仿真环境中将其建模为全桥LLC谐振转换器的一部分。进行的仿真表明，热补偿磁滞模型能够影响高达120°C的铁心温度时产生的铁心损耗$ ^ {\ circ} $ C.最后，在系统级仿真中成功关闭了变压器内的温度反馈环路，从而可以更精确地确定铁心和绕组的稳态温度。