| As an important part of power conversion,AC/DC resonant converter is widely used in aviation,national defense,urban lighting,new energy,security and medical and other fields.Realization of high power density based on key technologies such as single-stage topology and electromagnetic integration has attracted much attention and research.In view of the current research status and development trend of AC / DC resonant converter and electromagnetic component integration,firstly,it is considered that design of FMLF electromagnetic integration is more reasonable and effective,which is supplemented and analyzed in detail.It covers two magnetic component analysis methods and three magnetic component transformation methods;Four frequently-used modeling methods are summarized and compared.modeling method based on infinitesimal is more generalized.In addition,in high-frequency research,distributed parameter representation model can more accurately predict size or influence of parasitic parameters;According to requirements of different applications,a staggered multilayer structure and a variety of laminated structures are proposed to realize design of large capacitance and multi capacitance,which provides the possibility for more requirements;According to the respective characteristics of materials and the actual effect of application,how to correctly select main materials in filter and power circuit is investigated and studied;Based on the parasitic effect,different relationship and calculation expression between integrated capacitance and parasitic capacitance in the case of single / double integrated capacitance structure are analyzed and compared.Then,a novel single-stage AC/DC resonant converter I is presented.Based on existence of discrete electromagnetic components occupying a large volume of system in this topology,three FMLF integrated structures optimized with different power densities are proposed,their design principles and characteristics are described in detail,and optimization effects of three integrated structures are evaluated.Among them,Structural #3 size designed based on magnetic flux decoupling method is reduced by23.56%,one magnetic loop is saved,and structure is symmetrical and balanced,which is more conducive to stable and reliable operation of system;According to actual physical model of superior structure #3,inductive coupling coefficient is extracted.Results show that decoupling can be realized to meet rationality of design.At the same time,research on saturation based on independent magnetic circuit and shared magnetic circuit,ANSYS Maxwell finite element simulation is established to verify effectiveness of three integrated structures.Finally,in order to reduce switching loss,a novel single-stage AC/DC resonant converter II is introduced.Working principle,gain characteristics,impedance characteristics and system loss are analyzed.Based on theoretical analysis and preliminary simulation verification,it is concluded that converter can not only realize ZVS on,but also realize QZCS off;Moreover,in consideration of fact that there are still multiple discrete electromagnetic components occupying system volume in topology,a relevant integrated design of electromagnetic components is proposed based on the above optimization integration method,which is integrated into a group of E-EE magnetic core by flux theoretical analysis to ensure rationality of design.Parameter design process is given in detail,and an experimental prototype is made through parameter verification.Based on this,ANASYS Maxwell simulation model consistent with real object is established to verify feasibility of theoretical analysis,and hardware platform of 100W/100 k Hz discrete electromagnetic components and integrated structure is built for experiments.The novel converter II can realize ZVS on and qzcs off,and verify that the integrated structure is well compatible with the system operation,volume is reduced by 39.32%,and optimization effect of system power density is obvious. |
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