Study and Application of Piezoelectric Pulse-wave Energy Harvester Skin Patch Operating in 3-1, 3-3 Mode

• Main Authors: Wei-Hao Tang, 湯幃皓
• Other Authors: 吳文中
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/98p99e

碩士 === 國立臺灣大學 === 工程科學及海洋工程學研究所 === 106 === Due to the growing population with chronic diseases in aging society, the expenses of healthcare increases dramatically. Thus, wearable devices gradually prosper for the purpose of health condition monitoring to reduce healthcare expenses. However, if these sensor devices are powered by batteries, they will cause the limited service time and environmental impact. In order to extend the service time of batteries, or even replace them, many researchers have been studied on transforming the dynamic energy from human motion into electrical energy. Due to the popularity of the wristband-type devices and regular pulse from human arterial pulse, this study is based on harvesting the energy from arterial pulse. The piezoelectric material is chosen to fabricate the energy harvester because of its high electromechanical coupling factor. The bridge-type pulse wave energy harvester (EH) is made by commercial PZT. With the optimized fabrication process of aerosol deposition method, annealing, and poling of PZT thin film by our previous study, the output performances between soft-type (AC750) and hard-type (MPT) PZT, between {3-1} and {3-3} mode are compared, which will further be confirmed by numerical simulation. The experimental results show when operating in {3-1} mode, AC750 and MPT bimorph EH with same dimension generate the maximum voltage of 71.1 mV and 104.8 mV under an optimal load when measuring pulse-wave. The corresponding instantaneous power are 5.05 nW and 13.4 nW. When in {3-3} mode, MPT unimorph EH generates the maximum voltage of 190 mV and 4.4 nW. The output power hasn’t achieved to certain level so far, but it still shows the potential application of pulse-wave EH.