Automatic Impedance Matching Method And Experimental Research Based On Improved Particle Swarm Optimization

Magnetic coupled resonant wireless power transmission technology as a new energy transmission technology has changed the dependence of the traditional power transmission on the electric wire.It has the advantages of long transmission distance and strong penetrability.It has created a new method of wireless power transmission and has important research significance and practical value.In the magnetic coupled resonant wireless power transmission process,when the distance between the coils and the load changes,or other aspects change,the equivalent impedance of the system change,so the load impedance will mismatch with the RF source and the transmission efficiency would significantly decreased.Therefore in order to solve the problem of reduced transmission efficiency caused by the system impedance mismatch,wireless power transmission automatic impedance matching method is put forward in the paper,that is,by detecting the reflection coefficient of the system automatically adjusting the impedance matching network.It has further improved the theoretical basis of wireless power transmission and promotes the development of wireless electrical products.In this paper,firstly the analysis of magnetically coupled resonant wireless power transmission technology is made,then,based on the comparison of the structure of existing matching networks,the advantages and disadvantages are analyzed.Aiming at the matching requirement of high power magnetic coupling resonant wireless power transmission,a generalized "?+?" type matching network structure is proposed.Then,in order to improve the speed and accuracy of the matching network,an improved particle swarm optimization algorithm is adopted in this paper.Finally,in the wireless power transmission system,the fixed-point matching,automatic matching and no match case are studied by a comparative experiment.The real-time and reliability of the wireless power transmission automatic impedance matching system is verified by adding the automatic impedance matching of the wireless power transmission system Based on the reflection coefficient,the improved particle swarm algorithm is used to obtain the matching network parameters.By controlling the relay array to switch the matching structure,it can greatly reduce the energy reflection to ensure the efficient transmission of energy system.