Impedance Matching Network Optimization to Maximize Efficiency and Energy Transfer of WPT Systems

This paper presents ananalytical optimization method for calculating the optimal stored energy in themagnetic field generated by a wireless power transfer (WPT) coupler. The ratio between the energy stored in themagnetic... [ view full abstract ]

This paper presents ananalytical optimization method for calculating the optimal stored energy in themagnetic field generated by a wireless power transfer (WPT) coupler. The ratio between the energy stored in themagnetic field and transferred power is derived tooptimize the driving point impedance, which in turn determines the efficiencyof the system. A new parameter, reactance mismatch coefficient, isdefined to quantify the impact of impedance mismatch on efficiency.  Furthermore, thewireless power transfer figure-of-merit (FOM) is redefined to consider theimpedance matching capability. Circuit simulation is developed to validate theproposed methodologies and associated equations.