Conference Program - LOPE-C 2011

SCIENTIFIC CONF. | THURSDAY-JUNE 30, 2011
Track 4
Systems and Implementation Issues (02:30 pm - 04:00 pm) | LOCATION HARMONIE D / LEVEL C2
02:30 pm Solar Energy Harvesting Integration in Mobile Devices
Ms Stephanie Fajtl,
ST Ericsson, Designer, France
SOLAR ENERGY HARVESTING INTEGRATION IN MOBILE DEVICES
Mobile, computer and consumer industry are converging somehow to bring a real new user experience by opening the door of a wonderful connected world. The mobile
industry is facing one of it biggest challenge : users are expecting faster processors, bigger screens, high resolution camera, playing game, be always connected whatever
their location, broadcasting TV or movies, listening high quality music and with no need to charge the mobile phone every time.
Despite real progress to make more efficient and low power devices and advance in battery technologies, the gap between the user expectation and the energy available is
unlikely growing year over year.
To face to this main challenge we propose to harvest energy from any sources and most important to contribute to reduce use of carbon energy and reinforce recycling.
Technologies to gather energy present interesting performances and announce big improvements to generate enough power for the application. The way to manage the
available energy and distribute into the system is fundamental.
Solar energy present great interests: free, available relatively everywhere and best in class in term of efficiency.
ST-Ericsson?s aim is to put in place energy harvesting for mobile devices which reduces battery drain to zero in standby mode which will be a great achievement but
another one equally important is to extend battery lifetime.
Today we demonstrate that thanks to a photovoltaic cell of just 5x5cm an MP3 playback is running using only solar energy.
Printed, Organic or not, Photovoltaic technologies present great advantage in term of integration in mobile devices which is a major point to be massively adopt in mobile
devices.
I will propose to present solar energy harvesting in mobile devices study in three main points:
?Integration constraints link to mobile devices
?How much power can we expect for different technologies addressing different use cases and different mobile devices
?How to manage the harvested energy.
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