Wearable ubiquitous energy system
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February 2021, Vol. 64 124201:1–124201:3 https://doi.org/10.1007/s11432-020-2895-3
Wearable ubiquitous energy system Fang DENG1,2* , Ning DING1,2 , Ziman YE1,2 , Yeyun CAI1,2 & Jie CHEN1,2 1 School of Automation, Beijing Institute of Technology, Beijing 100081, China; Key Laboratory of Intelligent Control and Decision of Complex Systems, Beijing Institute of Technology, Beijing 100081, China
2
Received 31 March 2020/Accepted 14 April 2020/Published online 26 August 2020
Citation Deng F, Ding N, Ye Z M, et al. Wearable ubiquitous energy system. Sci China Inf Sci, 2021, 64(2): 124201, https://doi.org/10.1007/s11432-020-2895-3
In recent years, owing to the growing maturity of Internet of Things technology and mobile communication technology, intelligent wearable devices have developed rapidly. They have been widely applied in aviation, medicine, military, entertainment and other fields. Through intelligent wearable devices, people can communicate efficiently, dynamically perceive external environments, and monitor the body’s vital signs. The devices can also timely feedback and process information [1, 2]. However, on the one hand, wearable devices are restricted by the requirements of comfort, portability and miniaturization. On the other hand, traditional batteries also have problems such as large quality, large volume, short battery life and limited power supply life. In addition, non-active power generation has low power density and poor continuity, which is not enough to support equipments for a long time. Energy supply has been the bottleneck restricting further development of wearable devices. Therefore, this study proposes a wearable ubiquitous energy system. Through wearable clothes and devices, ubiquitous energy such as solar energy, thermal energy and mechanical energy generated by human movements can be efficiently harvested, which can be converted into electric energy for comprehensive utilization. It can not only avoid the environmental limitation of single energy supply, but also meet the energy demand of normal use of low-power wearable devices. This is a powerful means to solve the energy supply problem of smart wearable devices. Ubiquitous energy harvesting. Different types of ubiquitous energy have very different harvesting mechanisms. The following three kinds of energy harvesting devices are designed according to different use environments, as shown in Figure 1. (1) Solar energy. Solar energy is widely found in nature and contains huge energy. Solar energy can be converted into electric energy by utilizing the photovoltaic conversion characteristics of semiconductor materials. The most effective combination of solar harvesting and wearable concept is to make solar clothes as shown in Figure 1(a). The improvement of conversion efficiency and the development of flexible
solar-cell technology have laid a foundation for the energy harvesting device in solar clothes. When walking normally, the back of the body is exposed to sunlight for a long time. Multiple flexible solar cells are conn
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