Application Of Electromagnetic Integration In Photovoltaic Energy Storage Integrated Multiphase Resonant Converter

With the gradual development of electronic technology in science and technology,many electrical equipment are developing towards miniaturization,high density,high integration and high efficiency,among which the lighting power supply is the first to bear the brunt.Firstly,the background advantages of photovoltaic energy storage LED power lighting system and the development of passive component integration technology are described in this paper,and put forward solutions to the problems encountered in photovoltaic energy storage lighting system,and then its significance and function are analyzed.Secondly,photovoltaic energy storage and resonant circuit is discussed in this paper,and fully considers the application scenarios of LED lighting system,so as to propose a targeted topology photovoltaic energy storage integrated multiphase resonant converter.The two most important parts are briefly introduced in this paper,the front stage photovoltaic energy storage integrated converter and the rear stage polyphase resonant converter.According to the analysis and comparison,the effect of these two parts on the new topology and the advantages compared with the old topology are obtained.Then,aiming at the problem of low power density in this topology,two kinds of integration technologies are introduced;Printed circuit board(PCB)integration technology,flexible multi-layer foil(FMLF)integration technology,the similarities and differences between them are analyzed and compared in this paper,expounds the advantages and functions of integration technology,and selects FMLF integration technology as the main integration scheme of this paper.Thirdly,aiming at the front-end circuit of photovoltaic energy storage integrated multiphase resonant converter,the photovoltaic energy storage integrated transformer is proposed in this paper,and a comprehensive structure of resonant inductor is proposed,battery resonant inductor and battery energy storage inductor made by flexible multilayer strip(FMLF)integration technology.The first step is to analyze the principle,structure and connection mode of the four integrated structures.The parameter calculation method of the integrated device is discussed in detail,then,the magnetic flux and loss are calculated through the magnetic loss theory,and the relevant simulation is carried out with the help of Maxwell / Ansoft the magnetic simulation,loss simulation and thermal simulation are carried out.Lastly,a 175W-200 k Hz integrated device prototype is designed according to the tradeoff between theoretical parameters and practical materials,and the rationality of the design is verified by the actual parameters test of the prototype.Finally,for the multi-phase Resonant Converter in the new topology,FMLF integration technology is proposed to integrate a resonant inductor,a current sharing capacitor and a transformer.The parameter design method of the integrated device is discussed in detail,then the magnetic flux and loss are calculated according to the magnetic loss theory,and then the magnetic simulation is carried out by Maxwell simulation software.Lastly,a 200W-200 k Hz integrated device prototype and a 150 W resonant power supply experimental prototype are made to verify the rationality and feasibility of the device.