Energy Harvesting for Mobile Computing Joe Paradiso Responsive ...
Energy Harvesting for Mobile Computing Joe Paradiso Responsive ...
Energy Harvesting for Mobile Computing Joe Paradiso Responsive ...
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Magnetic and Electrostatic Microgenerators<br />
• Many, many devices in current literature<br />
– Chandrakasan, Roundy/Wright, Mitcheson, El-Hamadi, James,Yates, Li,<br />
Taishiro, Ching, Miyazaki, Goerge…<br />
• Powers range 10’s-100’s of μW<br />
• Most employ spring return<br />
– Mechanically resonant, 10’s of Hz – several kHz<br />
• Others use bistable action return w/o spring<br />
– Mitcheson 2004 – broadband<br />
• Magnetic generators can approach 1 mW<br />
– 100-500 Hz, 25-200 μm motion, ~1 cm3 (court. Mitchenson)<br />
• Electrostatic generators tend to produce 100 μW<br />
– Simple to integrate onto MEMS<br />
– Need bootstrap supply<br />
– Constant charge (sliding) and constant voltage (pressing) modes<br />
36 mW @ 12.6 kHz<br />
Beeby et al<br />
Southampton<br />
6 μW @ 6 Hz<br />
Miao et al<br />
Imperial College
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