An experimental energy set-up for wireless battery recharging

Anywhere a primary electrical source is not available, batteries seem to be the only way to allow the use of stand-alone electrical facilities. Unfortunately, there are some issues related to the use of batteries such as the necessity of regularly checking their charge status and, eventually, proceeding to their replacement, as well as of caring for their treatment as special waste at the end of their lifecycle that have to be faced; actually the delayed replacement of exhausts batteries is the primary cause of unavailability of the services offered by stand-alone devices. Rechargeable batteries just mitigate the aforementioned issues, since they require periodical interventions likewise to perform recharging, that, nonetheless, can be as troublesome as their replacement in several situations. Wireless power transmission approaches smoothly fit batteries recharging applications. In particular, by means of suitable solutions it is possible to recharge batteries without invasive operations, such as removal and reinstallations, but letting the batteries on board of the supplied device. In this paper, a wireless power supply system suitable to recharge general purpose NiMH batteries and Li-ion mobile phones cells, as well as the auxiliary wireless sensor systems, is presented. Details related to an experimental set-up aimed at highlighting the feasibility of the proposed approach are plenty given.