Study On Optimization And Compensation Of Plane Transformer Winding In Wireless Charging System

The technology of electric vehicle is becoming more and more perfect with the increasing progress of the society and the rapid development of science and technology in recent years.It is strongly convinced that the development of electric vehicle technology is imperative.As the reason for rapid development of electric vehicle,environmental pollution factors which seriously affects people's daily life bear the brunt.The advantages of electric vehicle such as low carbon and environmental protection can help to reduce air pollution.However,whether the development of electric vehicles can be steadily leans on efficient charging technology.Therefore,the research on the performance of contactless planar transformers is the key link.The analysis of compensation technology in contactless transformer module in order to optimize the winding of transformer,to improve the transmission efficiency as well as to reduce the loss and leakage of transformer has important significance and wide application prospect.The main work of this article is as follows:First,this paper studies winding distribution of non-contact transformer in wireless charging system and proposes optimization design to improve transfer efficiency of planar transformer.It presents wraparound winding distribution,compares it with the existing side winding structure,establishes two magnetic circuit models,discusses transmission performance of each model and proves superiority of the program presented.On these bases,the paper adopts wraparound winding distribution to design planar transformer,quantitatively analyzes transmission performance of transformer and performs optimization design.Planar transformer coil technology is studied also,combined with the loss and leakage analysis,it can be learned that reduce the leakage is the most effective way to reduce the number of winding turns,but in the given parameters and topology,reducing the number of windings will make the core loss increases,distributed capacitance increases,the change of winding must turns to go through a comprehensive consider.Core loss also related to the leakage inductance of transformer winding arrangement.In addition,the loss of the transformer is also related to the temperature,which lays a theoretical foundation for the design of the experiment.Finally,the primary and secondary compensation technology of the transformer module is studied.regarded inverter circuit and non-contact transformer as a whole,consisting of contactless transformer,through the analysis of contactless transformer compensation,the relationship between the energy transmission efficiency,switching frequency and angle compensation parameters.On this basis,an optimized compensation scheme is proposed.The compensated contactless transformer can be equivalent to LLC.The non-contact plane transformer is designed,the simulation model and the experimental principle prototype are built to verify the results.The simulation and experimental results show that the designed wraparound planar transformer can effectively improve the transmission efficiency compared with the compensation without adding compensation,and the transmission efficiency of the optimized contactless transformer is increased to more than 90%.As a result,the non-contact plane transformer designed in this paper has the advantages of small leakage inductance and high transmission efficiency.