Energy Harvesting for Mobile Computing Joe Paradiso Responsive ...

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Inertial Microgenerators (piezo) • Ho, 1961 – Claimed 150 μW when coupled to 80 Hz heartbeats • Roundy & Wright, 2003 – PZT bimorph – 100 μW when shaken at resonance – Building MEMs structure w. 80 μW per cm 3 (@ 800 Hz) – Berkeley group also making tunable cantilevers
4/04 © MIT-ML Microgenerator Per<strong>for</strong>mance 1 cm 3 devices •For human body motion (Hz-level excitation) –Few μW/cm 3 •For machine excitation (kHz-level excitation) –Hundreds of μW/cm 3 Tends to go as w 3 and y 0 2 Personal comm, Paul Mitcheson, Imperial College UK JAP 23
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