A wireless battery charger architecture for consumer electronics

In this paper, an innovative design of a wireless battery charger for portable electronic devices is proposed. The wireless power transfer is implemented through the magnetic coupling between a power transmitter, which is connected to the grid, and a power receiver, which is integrated inside the load device. An innovative receiver architecture which heavily improves the power conversion efficiency is presented. The proposed solution is standard compliant and suitable for IC implementation. A comparison between a conventional and the proposed receiver architectures is carried out by SPICE simulations. As shown by simulation results, a power efficiency increase by 40% is provided by the proposed solution. A laboratory prototype of the proposed wireless battery charger has been realized and tested to evaluate system performances. As shown by experimental results, thanks to the proposed architecture, over the entire range of operating conditions the receiver efficiency lies within the 96.5%÷99.9% range.