Research And Design Of Wireless Charging System Based On Magnetic Resonance

With the rapid development of society,energy shortage,environmental pollution,climate change and other issues are becoming increasingly serious,which are badly affecting the human beings production and life.The emergence of new energy vehicles has effectively improved the current situation,as an important way to alleviate the energy crisis and environmental pollution,the development of new energy vehicles gets strong support from governments all over the world.At present,most of new energy vehicles are used in the traditional way of wired charging,which exists poor adaptability,prone to spark and many other drawbacks.The wireless charging technology,emerging in recent years,not only overcomes these drawbacks,but also has features like unrestrict to climatic conditions,low cost of man-made management,has become the future development trend.Based on the theory of wireless power transmission technology,this paper designs and realizes a magnetic resonance wireless charging system for a small electric vehicle.First of all,we complete the detailed circuit theory derivation,and use PSPICE for simulation verification.Secondly,we design the framework of lithium battery wireless charging system,which includes wireless power transmission subsystem and wireless charging control subsystem.The main work of the hardware part of the system includes optimization of the core loose coupling transformer,design of a series of circuit schematic,and production and debugging of the PCB board,as to software part we completed the design and debugging of the communication control program of the original secondary collection.Finally,in order to test the performance of the system,we set up a wireless charging test environment and complete the test of the primary and secondary key waveforms of the system,auxiliary power output,acquisition feedback module and function of lithium battery wireless charging.Tests show that the circuit of the wireless charging system meets the design requirements,each hardware module was able to work in a long time reliable,safe way,the software was running stably,the original and secondary side communicated smoothly,the system achieved the desired function.In the 18cm air distance,the system maximum output power was more than 120W,the charging efficiency of the system maintained at around 83%in the most of time,and the maximum value could reach to 84.1%.Wireless charging is likely to replace the traditional contact charging in the future.Future work could be focused on system optimization,improve security and reduce the system cost,etc.