Research On Integrated Magnetic Parts Of A Combined Zeta Converter

With the environmental issues and energy problems,the development of new energy industries such as photovoltaic power generation and electric vehicles is rapidly progressing.High-gain DC/DC converters are of great significance to industrial development.In recent years,scholars have used cascade,combination,and isolation transformers to achieve high voltage gain.However,as the voltage gain increases,the complexity of the circuit increases,and the number of magnetic components in the circuit also increases.Increasing the use of magnetic integration technology to integrate magnetic components can effectively reduce the current ripple in magnetic components.However,different magnetic core structures have different characteristics in terms of magnetic flux distribution,fringing flux,and operating temperature rise,and there are also great differences in material utilization,loss,heat dissipation,and efficiency with different integration and coupling methods.Based on the above situation,this paper takes the combined Zeta converter as the research object,performs modal analysis of the inductive coupling situation,and designs an integrated magnetic part that meets the requirements of the circuit based on the analysis of the performance of the traditional magnetic device and proves it through simulation and experiment.The correctness and feasibility of magnetic design.In this paper,firstly,the modal analysis of the inductive coupling of the combined Zeta converter is performed.There are three forms,namely,the three inductors are not coupled,the two energy storage inductive coupling,and the three inductors are coupled.Afterwards,two inductance-integrated three-inductance-coupled magnetic devices were designed,and two schemes of “EE” type magnetic core and type “?” array magnetic core were designed,and the principle analysis and the Ansys Maxwell finite element simulation software were performed.simulation.Afterwards,a three-inductor integrated three-inductor-coupled magnetic device was designed.Based on the specific relationship between the three inductive couplings,a new type of integrated magnetic component—“CO”-type integration was proposed based on the traditional magnetic components.The magnetic parts were analyzed in principle and simulated by Ansys Maxwell finite element simulation software.Finally,the theory is systematically demonstrated by PSIM simulation and experimental verification.Through modal analysis,the relationship between the variation of the inductor ripple and the coupling coefficient after coupling with two different coupling modes is analyzed,and the optimal inductive coupling coefficient in different modes is designed.In the case of three inductors and two inductive couplings,the principle correctness of "EE" core and type "?" array core has been proved and compared.In the case of three-inductor integrated three-inductorcoupling,the "CO" type integrated magnetic part is systematically discussed.Then,from the magnetic circuit and circuit structure,three inductance and mutual inductance design methods are given.Finally,through simulation and experiment,the simulation analysis of the inductor ripple of different integration methods,through the production of magnetic parts,the acquisition of waveforms in the experiment,proved the correctness of the circuit analysis and magnetic parts design.