Abstract: In this paper we discuss system structures, in which mobile phones act as either active or passive devices depending on available communication between smart phones and their solar chargers. A suitable small size solar cell panel is selected that is easy to carry to any locations farther from city electric grids. Both smart phones and solar chargers design approaches have their advantages and disadvantages, which we will elaborate in more detail in our analysis. The alternative use of the solar energy as power source is helpful in outdoor emergency situations and avoids the traditional way of waiting beside an electrical sockets or outlets for charging. We discuss here a special electronic design and construction with an important merit related to controlling battery charging currents. The results from the simulation and the experiment show the designís sufficient feasibility for practical implementation.

Keywords: Solar panel, mobile phone, portable charger, mobile battery, Solar power, photovoltaic.