Simulation Analysis Of Transformer Copper Loss In Switch Power Supply

With the continuous development of power technology, high-frequency and high power density switching power supply system has become the research and development trends. Transformer is the core component of switch power supply, it is an important factor to the switch-power-supply's performance and stability, along with increasing of the operating frequency, the structure of the transformer is become more and more compact, high-frequency effects (including skin effect and proximity effect) to make the winding loss increase. Winding loss of Transformer can easily cause partial overheating and even burning of the transformer, so give the winding loss value exactly of the transformer has important engineering significance.Issues are studied in this paper seems to be steady-state alternating electromagnetic field problems. So, this article begin with the Maxwell equations and describes the seemingly stable alternating electromagnetic field theory and analysis of the problem used finite element method. Analysis of skin effect and proximity effect on the loss of high frequency transformer windings, introduced the type of iron loss in core material and the mechanism of the formation.In this paper, three-dimensional electromagnetic analysis model of high-frequency transformer is built, use the finite element method to do numerical solution. The influence between Section spacing of secondary winding, primary winding and flux leakage of magnetic core to the secondary winding are simulated, the equivalent factor is introduced between the rectangular wire and the round wire. Analysis show that, when we consider the Section spacing of secondary winding, primary winding and flux leakage of magnetic core, the secondary winding copper loss of high-frequency transformer is 246.09W, which is larger than the value 107.50W calculated by Dowell model, this provides a reference to the transformer's optimization design.To the same transformer, equal cross-section area model and equal height model are introduced, and testify there correctness. Through the finite element analysis, this paper gives the loss of the gasoline tank generated by the transformer leakage flux. At last, when the layer is nine, the loss is optimization.Through this work, we can get some conclusions and revelation, it has significance to the actual work.