Electrostatic Power Harvester using a Liquid-Gas Flow Array
Date Issued
2014
Date
2014
Author(s)
Hsieh, Meng-Yang
Abstract
Enabling technologies for wireless sensor networks have gained considerable attention in research communities over the past few years. With the development of the low powered small wireless electronic devices, it is highly desirable, even necessary in certain situations, for wireless sensor nodes to be self-powered.
In this work, Electrostatic power harvester using a liquid-gas flow array has been developed. The harvester is combined with 250μm micro-channel and arranged liquid-gas flow in channel. The Electrostatic power harvester converts mechanical energy to electrical energy. The front-end design of T-shaped structure can generate liquid-gas flow, and considering the need to put into shoes, the substrate shall be flexible. Using PDMS as substrate, patterning electrode in micro-channel as parallel plate capacitor, the back-end design of a chamber can be pressed by mechanical force.
With the present power harvester, average power 2.78μW is obtained at bias voltage 5V, resistance 120kΩ, single electrode area 2cm×1mm. Multi-electrode harvester has gas and liquid depth 5-7mm at velocity 4mm/sec, and produce average power 5.52pW. Multi-electrode harvester gained more power as velocity increasing. The theory of the parallel plate capacitor power harvester model is also presented.
Subjects
微機電
能量擷取
靜電
微流道
兩相流
T型管
Type
thesis
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