Research On Synchronous Tracking And Control Methods For Power Transmission Efficiency Of Radio

As a newly emerged technology with great application potentials,wireless power transmission by ways of electromagnetic coupled resonance can achieve power transmission at a distance range of meter level,ignoring the affect of nonmetallic obstacles.This technology which has great scientific significance and research values and overcomed many shortages in traditional power transmission,It opened up a newway for power transmission.At present,the wireless power transfer of the magnetic coupling resonance is still difficult to large-scale promotion,and still exists a series of problems need to be solved.Improvement of power and efficiency is one of the problems during the process of power transmission.Performance of transmission system will be influenced by the transmission distance variation,the offset between of the resonant coils and the the change of load.In this paper,we proposed a new method which can tracking the frequency adaptively to improve the transmission power and efficiency of the system.In this paper,the composition and principle of the wireless power transfer of magnetic coupling resonance were analyzed.And the frequency characteristics of the system was further studied.The substantial decline of transmission effieciency due to the resonance frequency split caused by transmission distance variation.With this,we further investigated the relationship between the frequency and the maximum value of the efficiency and power.And concluded that the frequency points of the maximum value of the power and efficiency were not consistent.The designed power transmission experimental platform consists of DDS signal generator,broadband linear amplifier,transmission coil,receiving coil and rectifier circuit and on the bases of principle analysis for electromagnetic resonant wireless power transmission.This paper combined with wireless power transfer system states fitting and matlab simulation to verify the effectiveness of the proposed algorithm.Then it set up the experimental system,embed the improved algorithm in DSP.Feedback signals were sent to the DSP end from the load by Zigbee,so as to improve the output power and efficiency of system.Finally,the correctness of the theory was verified by the experimental platform of frequency tracking control system.The unconsistency of the system power and efficiency was verified by experiments.And for without adding the frequency tracking and frequency tracking two cases,compared to the optimal power and efficiency.So as to verify the reliability and real-time performance for validation of the frequency tracking control system,which can greatly reduce the influence of the interference factors on the system,and ensure that the system with maximum power transfer.Thus enrich the further study of the theory of the transmission technology,promotes the development of practical products.