Human powered wireless charger for low-power mobile electronic devices

A new wireless charger, named as Human-Powered Wireless Charger (HPWC), is proposed for low-power mobile electronic devices in this paper. Unlike conventional plug and socket charger, HPWC is not only a wireless one but also powered by human. It can harvest human energy, convert it into electricity, and then deliver to mobile electronics wirelessly. Theoretical analysis on the working principle of the HPWC has been performed. In addition, conceptual experiments have been carried out to demonstrate the feasibility of HPWC. The output characteristics of HPWC with two kinds of receiver coils have been tested when it works at different frequencies. It is shown that the maximum open-circuit voltage of this charger can reach 1280mV, when the number of coil turns in receiver is 700 and the rotation frequency of hand crank is 1.5Hz. Moreover, the output voltage of HPWC with a load has also been measured. The maximum output voltage of HPWC with a load of 75Ω approximates to 400mV and an effective power of 1.1mW is gained when the 700 turns coil in receiver is available and the rotation frequency of hand crank is 1.5Hz. These results suggest the important value of HPWC in future electronics. Further, improvement and extensive applications of HPWC have also been discussed.