Abstract:
The research on high-efficient non-radiant wireless power transmission (WPT) system using highquality
factor resonant coupled coils has become remarkable for powering various portable
household devices, biomedical implants, and electrical vehicles since last decade. Therefore,
practical WPT must be able to support complicated coil configurations and keep following magnetic
resonant conditions with maximum power transfer capability during coupling distance variation. In
this paper, an adaptive two-side impedance matching technique using self-tuned L-matching
circuits at both the transmitting and receiving sides is proposed for maximizing transmission
efficiency in resonant coupled WPT system. The tuning value of inductance and capacitance for
matching networks are derived based on the Q-based design principle, and extracted impedance
ratios and S-parameters. The feasibility of the theoretical model is testified against simulation and
measured data. The developed model shows that using two-side matching technique maximizes
transmission efficiency over 80% for a range of 15 35 cm. The proposed technique also
successfully retains the resonant frequency and is much more potential to provide maximum
efficiency for the resonant coupled WPT system.
