Maximum Efficiency Tracking Control Method of WPT Based on SAR Impedance Matching
Wireless power transfer(WPT)technology has attracted much attention due to its advantages of safety,convenience,and non-contact.Maximum efficiency transmission is an important issue in WPT systems.The traditional maximum efficiency tracking method usu-ally sets the system to perform load impedance matching at a fixed coupling condition.However,the coupling coefficient will inevitably change when the relative positions of the primary and secondary coils change.A maximum efficiency tracking control method based on cou-pling coefficient identification and semi-active rectification(SAR)impedance matching is proposed,which uses SAR combined with cou-pling coefficient identification to perform impedance matching,and switch controlled capacitor(SCC)to compensate for the imaginary part of impedance,avoiding the influence of nonlinear factors in the rectifier circuit.At the same time,the system response is fast and the con-trol method is easy to realize.The simulation and experimental results show that when the coupling coefficient and the equivalent load change,the coupling coefficient can be accurately estimated and tracked to the maximum efficiency point and stable output voltage.
wireless power transfer(WPT)maximum efficiency trackingSAR impedance matchingcoupling coefficient identification
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