正弦与非正弦激励下高频变压器磁心损耗计算与验证

Calculation and verification of core loss of high frequency transformerunder sinusoidal and non-sinusoidal excitation

提高正弦和非正弦激励下的磁心损耗模型的计算精度,对高频变压器的设计与研究有重要意义。本文首先在经典正弦损耗分离模型的基础上引入涡流和剩余损耗修正系数,推导出在方波与三角波电压激励下修正的损耗分离计算模型,并通过实验室搭建的磁特性测量系统测量出非晶与纳米晶磁心的损耗数据。其次,依据损耗系数随磁通变化的特性,提出一种改进的损耗分离模型的方法,与经典模型相比有更高的准确性,并得出非正弦激励下改进的计算模型。最后,对比分析方波与三角波电压激励下的计算结果与测量值,验证了本文提出的改进损耗分离模型的有效性与可行性。

Improving the calculation accuracy of the core loss model under sinusoidal and non-sinusoidal excitation is of great significance to the design and research of high-frequency transformers.First of all,this paper introduces eddy current coefficients and residual loss correction coefficients on the basis of the classic at sinusoidal loss separation model,and derives the modified loss separation calculation model under the excitation of square and triangle wave voltage.And a magnetic property measurement system is set up in the laboratory to measure the loss data of amorphous core and nanocrystalline core.Secondly,based on the characteristics of the loss coefficient changing with magnetic flux,an improved loss separation model is proposed,which has higher accuracy than the classic model.The improved calculation model under non-sinusoidal excitation is teduced.At the end,by comparing and analyzing the calculation results and measured values under respective square and triangle wave voltage excitation,the validity and feasibility of the improved loss separation model proposed in this paper are verified.