Magnetic Components Field-circuit Coupling Simulation And Its Optimization Design In Power Converters

Magnetic components play the role of energy conversion and transfer as one of the most important components in power converter.Thus,further optimization of magnetic components is imminent.Considering the analysis and optimization of magnetic components itself,the finite element simulation software is an effective method.However,when the interaction between magnetic components and circuit is considered and magnetic components assigned with complicated excitation are analyzed,using the finite element simulation alone will not be able to accurately simulate the actual operating characteristics of magnetic components.Thus,the field-circuit coupling simulation is adopted.It can not only consider the magnetic components' own characteristics such as magnetic circuit saturation,skin effect,loss,but also the effects of magnetic components to the circuit,such as spike voltage,spike current.First,this paper introduces the field-circuit coupled simulation method and the matters that needed attention.Then,in view of the transformer,detailed analysis and comparison are made in this paper in the terms of leakage inductor,parasitic capacitance and winding loss for the several kinds of existing transformer winding;On the basis of the interleaving winding,a new type winding is put forward to reducing the leakage inductance of the transformer.Then,the new winding and traditional interleaving winding are analyzed and compared with ANSYS Maxwell in three aspects of leakage inductance,parasitic capacitance and winding loss.And the corresponding simulation verifications are made.After that,the transformer with new winding is applied in the flyback converters and the analysis is carried out.Afterwards,the spike voltage between drain and source of power switches,the peak current during the power switch turns on and efficiency has been measured on the experiment.Both simulation and experiment results show that the proposed winding in this paper has the advantage in reduce the voltage stress of power switches and circuit loss.The air gap flux effect and parasitic capacitance under different windings of inductor are also analyzed.The inductor with several air gaps and the inductor with windings that are arranged to avoid air gap are analyzed and simulated for reducing the winding loss caused by air gap.Then the field-circuit coupling simulation method is used to study the inductor magnetic core loss under chaotic control,which provides certain reference to promote the control method.