| Electronics and Information Technology have developed rapidly in recent years and charging in a convenient and safe way has become a focal point in research.Wireless power transmission(WPT)technology transmits energy to load or battery through the air gap,avoiding the instantaneous abrasion of the conventional power transmission and the danger of leakage and electric shock of wires,so it is more secure and flexible.Inductive power transmission has high transmission power and efficiency,which is suitable for shortrange wireless charging and gradually used in many fields such as electric vehicles,consumer electronics,industrial homes,etc.WPT technology has considerable development prospects and very important research significance.In this paper,based on the principle of electromagnetic induction,topological analysis and coil designing,a WPT system has been developed which can charge load or battery wirelessly in an efficient and safe way.Firstly,the mutual inductance and leakage inductance model of the WPT system are analyzed and the circuits are simplified,and the components of the WPT system and the impact of each link on transmission efficiency are determined,and the effect of some key parameters on the system are clarified.Then,the characteristics and shortcomings of four traditional compensation structures are analyzed,and the transmission power and efficiency of different design of the compensation capacitor are compared,and a bilateral LCC compensation structure with better performance is proposed,and the output current and voltage changes with coupling coefficient and load are analyzed by matlab.Then,the materials and winding methods which is suitable for coupling coils under high frequency and high power conditions are designed,and coil magnetic field distribution is analyzed by maxwell,and the factors affecting the mutual inductance and self-inductance of the coil are analyzed,and shielding materials with good performance are chosen to orient the magnetic field.Then,the workflow of the WPT system is designed to enable the system to work normally and safely,and real-time monitoring and frequency modulation control with constant current and constant voltage are realized.Finally,the parameter design and simulink model were established based on theoretical analysis,and the constant current and constant voltage frequency of the WPT system were obtained through circuit simulation.When the system input voltage was 20 V,the maximum output power at the resonance point of 82 k Hz was 27.62 W,and the transmission efficiency reached 70.11%.The experimental platform was established to verify the change trend of the mutual inductance of the coils at different longitudinal distances and lateral dislocation distances.The experimental results were consistent with the theoretical analysis trends.By changing the load resistance and CC/CV frequency,the control method of CC/CV during the battery charging process was simulated at a distance of 6cm from the primary and secondary coil. |
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