The Optimum Design And Application Of Switching Power Supply’s Transformer

With the development of the Electronic Information Technology, all kinds ofelectronic device are developing quickly. As the electronic devices are upgraded and updated,there has the new demand for the switching power supply in the electronic devices, it requiresthe power supply modulation to be miniaturization, light weight, and high reliability. If wewant to realize the target, the switching power supply must be high-frequency, and thehigh-frequency transformer is the main part of the high-frequency switching power supply. So,the optimization of the high-frequency transformer is the key point for realizingminiaturization, light weight, and high reliability of the power supply system.With the improving of the frequency, high-frequency has bringing many high frequencyeffects such as skin an proximity effects. These high-frequency effects can produce acresistances, leakage inductances and distributed capacitances that will increase the dissipationof the switching power supply. When the energy of the leakage inductance and distributedcapacitance is released, that will inevitably produces a voltage spikes that endangers thenormal running of the switching power supply, and reduces the switching power supply’sperformance. In this paper, get the result that the requirements of reducing the leakageinductance and distributed capacitance is conflicting. So in this paper the optimal designprocessing must take into account all the parasitic parameters, it’s to reduce the effects on thetransformer’s performance.In this paper, the optimal purpose is to optimize a planar transformer. On the basis ofcomprehensive analysis the various parasitic parameters, this paper puts forward an optimizedmethod that combine the Maxwell3D and Saber software, via iSIGHT software it canconnect the Maxwell3D data with Saber software data, then it is used to analysis thehigh-frequency transformer’s parameters. By changing the pitch of the primary and secondarywindings, it can adjust the parameters of the planar transformer’s equivalent circuit to achievethe purpose of optimal design of the planar transformer. The main results of the paper is thefollowing three aspects: the theoretical analysis of the planar transformer’s parasiticparameters, the establishment of an equivalent model of the actual transformer; usingMaxwell3D simulation software to analysis the eddy current field and electrostatic field ofthe planar transformer, and obtain the detailed parameters of the equivalent circuit model;through multi-platform optimization software iSIGHT to integrate Maxwell3D and Sabersimulation software, and the voltage stress of the switch is the optimization objective, thespace between the primary and secondary windings is the optimization variable, at last get the design that the voltage stress of the switch is minimum, achieve the optimization purpose.