高频变压器损耗及温升特性分析
发布时间：2018-08-15 16:42
【摘要】：变压器的体积和重量会随着工作频率的不断提高而减小，但随之损耗增加，由此温升就成了不能忽略的问题，在设计变压器的同时，用有限元软件仿真其温度分布，得到变压器的热点，对变压器绝缘等级选择和散热有指导意义。 本文着重研究了用AP法设计高频变压器，分析了高频变压器的漏感和分布电容等参数，，理论推导了漏感和分布电容的计算公式，对磁芯损耗和绕组损耗进行了研究，在理论推导和软件仿真下，研究了集肤效应和临近效应对绕组电流密度分布的影响，仿真得到了二维模型的漏磁场分布，以及高频变压器的总损耗，利用顺序耦合法，把漏磁场分析结果作为温度分析的载荷，仿真得到高频变压器的二维温度分布，找到变压器的热点。 本文在变压器的开路试验和短路试验的基础上，拟合了空载损耗和短路损耗曲线，得到了额定条件下总的损耗值，并与仿真结果进行了比较。研究了变压器的冷却技术，分析了减小变压器温升的方法。
[Abstract]:The volume and weight of the transformer will decrease with the increasing of working frequency, but the loss will increase, so the temperature rise becomes a problem that can not be ignored. While designing the transformer, the temperature distribution is simulated with finite element software. The hot spots of transformer are obtained, which is instructive to the selection of insulation grade and heat dissipation of transformers. In this paper, the design of high frequency transformer with AP method is studied, the parameters of leakage inductance and distributed capacitance of high frequency transformer are analyzed, the formula of leakage inductance and distributed capacitance is deduced theoretically, and the core loss and winding loss are studied. Based on theoretical derivation and software simulation, the effects of skin effect and proximity effect on the distribution of winding current density are studied. The leakage magnetic field distribution of the two-dimensional model and the total loss of high frequency transformer are obtained by simulation, and the sequential coupling method is used. The result of leakage magnetic field analysis is taken as the load of temperature analysis, and the two-dimensional temperature distribution of high frequency transformer is obtained by simulation, and the hot spot of transformer is found. On the basis of open circuit test and short circuit test of transformer, the curve of no-load loss and short-circuit loss is fitted, and the total loss value under rated condition is obtained, and the results are compared with the simulation results. The cooling technology of transformer is studied, and the method of reducing transformer temperature rise is analyzed.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM407
本文编号：2184801
[Abstract]:The volume and weight of the transformer will decrease with the increasing of working frequency, but the loss will increase, so the temperature rise becomes a problem that can not be ignored. While designing the transformer, the temperature distribution is simulated with finite element software. The hot spots of transformer are obtained, which is instructive to the selection of insulation grade and heat dissipation of transformers. In this paper, the design of high frequency transformer with AP method is studied, the parameters of leakage inductance and distributed capacitance of high frequency transformer are analyzed, the formula of leakage inductance and distributed capacitance is deduced theoretically, and the core loss and winding loss are studied. Based on theoretical derivation and software simulation, the effects of skin effect and proximity effect on the distribution of winding current density are studied. The leakage magnetic field distribution of the two-dimensional model and the total loss of high frequency transformer are obtained by simulation, and the sequential coupling method is used. The result of leakage magnetic field analysis is taken as the load of temperature analysis, and the two-dimensional temperature distribution of high frequency transformer is obtained by simulation, and the hot spot of transformer is found. On the basis of open circuit test and short circuit test of transformer, the curve of no-load loss and short-circuit loss is fitted, and the total loss value under rated condition is obtained, and the results are compared with the simulation results. The cooling technology of transformer is studied, and the method of reducing transformer temperature rise is analyzed.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM407
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