精确预估非正弦电压波激励下高频磁心损耗,对于隔离式双向全桥 DC-DC 变换器中高频变压器的精细化设计至关重要.本文结合典型工作模态下矩形、梯形电压波,提出了修正Steinmetz 公式和损耗分离公式的改进解析计算方法,引入仅与占空比和上升时间有关的修正系数,据此可直接利用正弦波激励下的 Steinmetz 模型参数和磁心损耗分离模型参数,快速获取典型工作模态下磁心损耗.基于若干峰值磁通密度和频率下的正弦磁心损耗,利用回归分析获取Steinmetz 模型参数和磁心损耗分离模型参数.分别对环形纳米晶、非晶合金、铁氧体和3%取向硅钢磁心开展非正弦激励下的磁心损耗测量实验,将实验结果与解析结果进行比较,验证了典型非正弦激励下解析计算方法的准确性.%Accurately predicting the core loss under non-sinusoidal voltage magnetization is essential for the optimal design of high-frequency (HF) transformers used in the bidirectional isolated DC-DC converter with dual active bridges (DABs). In this paper, the modified Steinmetz formulae and statistical loss model (STL) that relate the core loss with the magnetization frequency, peak magnetic flux density, and waveform parameters like duty cycle and rise time, are presented to determine the core loss under rectangular and trapezoidal voltage magnetization in typical of DAB DC-DC converters. The empirical parameters of Steinmetz equation and the fixed coefficients of STL are calculated by using a regression analysis and a limited set of measured loss data in sinusoidal flux for any peak magnetic flux density value. Calculated non-sinusoidal core losses for nanocrystalline, amorphous, MnZn ferrite, and 3% grain-oriented silicon steel are compared with the measurements.
展开▼
