Research On The Cross-coupling Effect And The Power Distribution Of Multi-receiver MCR-WPT

With the rapid development of electronic equipment and the advances in science,the traditional charging method,which connected with the charging equipment through a wire,cannot satisfy people’s more need with it’s problems.Such as damage of the charging wire,limitation of charging distance and number of loads,etc.Therefore,improving the charging method is especially important.Wireless power transfer(WPT),especially the magnetically coupled resonant wireless power transfer(MCR-WPT),realized the completely isolate be the charging equipment from the power supply,effectively solving the problems caused by the wire.Multi-receiver magnetically coupled resonant wireless power transfer is the most developmental charging system.It has multiple charging targets and solves the drawback of unique number of load.The main research contents are as following:Firstly,based on the working principle and topological structure.The coupled-mode model and the mutual inductance model are established of the multi-receiver MVR-WPT,which proves energy transmission is trigonometric function or triangular-like function,while the transmission characteristics of the system are determined by various parameters.According to the power requirements of the electrical equipment,it is determined that the multi-receiver MCR-WPT operates under the maximum power transmission condition.Secondly,aiming at the cross-coupling effect existing in multi-receiver MCR-WPT,the compensated network is introduced,and the mathematical model of transmission power is deduced for the compensated system.The method of transmission factor is proposed to determine the compensated network as SSS type.In the simulation test,the current vector amplitude and phase of each coil are corrected,the load terminal voltage and system efficiency are improved,and the feasibility of the compensated network is verified.At the same time,based on the system efficiency,the optimal load of the multi-receiver MCR-WPT is determined to be three.Finally,in the corrected three-receiver MCR-WPT,the frequency division control method is used to reduce the mathematical model and the compensated network,and the number of compensation networks and parameter values in the system are modified to construce double-frequency three-receiver of two energy channels.The sub-model with cross-coupling effect in the first energy channel is simulated by MATLAB/Simulink,which proved that the system calibration is completed and the load terminal voltage is higher than the three-receiver MCR-WPT.After solving the cross-coupling effect,the power distribution is unbalance and does not satisfy the requirements.The load terminal voltage is taken as the constraint condition to study the power distribution at the load.The experimental results show that the dual-frequency and three-load MCR-WPT is better than three-receiver.The load voltage,current and total power of the MCR-WPT are increased to content higher requirements.