A unity factor input wireless power transfer system utilizing an adaptive tuning capacitor

Abstract

The introduction of reactive power will increase the component stress and reduce the system transmission efficiency. To realize zero reactive power input, a two-coil wireless power transfer (WPT) system utilizing an adaptive tuning capacitor (ATC) is proposed. Compared with conventional switched-controlled capacitor, no additional information sampling is needed in proposed ATC. Simultaneously, proposed ATC has a wide impedance matching range, which expand its practicality greatly. With proposed ATC structure, any possible WPT system detuning occasions caused by control strategies, compensation network or component aging can be avoided automatically. the Finally, an experimental platform is built to verify the feasibility of proposed method.