| Summary: | 碩士 === 國立交通大學 === 電控工程研究所 === 101 === Thanks for the low power CMOS VLSI technology, the power consumption is reduced to about a few tens of microwatts. Therefore, it becomes feasible to power portable devices by scavenging the ambient energy such as the human motion. Compared to mechanical vibration, the human motion of fingers, elbows and other joints is more complex, so the harvester needs to be flexible to use the body motion as an energy source. The advantage of flexibility is that the harvester can work for more than one human part (finger or foot) or one motion direction .This allows a wider range of applications of energy conversion and is more suitable for complex human movement.
In order to achieve flexibility, we chose the Parylene C as the electret material and use the polydimethylsiloxane (PDMS) as the subtract material. We investigated the electret charge stability for various charging conditions. The surface potential is -352V at the beginning and decayed to -207V after six month, which was 59% of the initial value (until 2013/7/19)
We consider the compression and bending which is common in human motion as the driving force in the output power measurement. The result was 8.4 nW, 84.1 nW, 0.184 μW and 2.19 μW when the pushing displacement was 1mm, load resister was 1000 MΩ, and push frequency was 1 Hz, 2 Hz,5Hz, 10Hz and 20 Hz respectively. The output power is 26 nW, 0.132 μW, 0.734 μW, 1.31 μW and 2.19 μW when pushing displacement was 0.4mm, 0.6mm, 0.8mm and1mm. In the bending case, one The output power was 1.59 nW, 3.54 nW, 22.6 nW, 57.8 nW and 82.4 nW respectively for different degree of bending.
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