Environmental Self-Adaptive Wind Energy Harvesting Technology for Self-Powered System by Triboelectric-Electromagnetic Hybridized Nanogenerator with Dual-Channel Power Management Topology

摘要

Natural wind energy harvesting enables a far-reaching and sustainablesolution to supply pervasive sensors in the Internet of Things (IoT). Electromagneticgenerators (EMGs) struggle to harvest energy from breezes, whichcauses regrettable energy wastage. Herein, a triboelectric-electromagnetichybridized nanogenerator (TEHG) is designed with a dual-rotor structure toconsolidate harvesting band for high efficiency of triboelectric nanogenerators(TENGs) in breeze and the EMG in high wind speeds. The TEHG performsan efficient energy collection (41.05 W m~(?3)) and a smooth output in the windspeed of 2?16 m s~(?1), attributed to the environmental self-adaptive cooperationbetween TENGs and EMGs. The TENG output power contribution ismore than 70% at low wind speeds (<5 m s~(?1)). Moreover, a dual-channelpower management topology (DcPMT) is established to co-manage outputsof two modules in TEHG. By virtue of the DcPMT hierarchically combiningthe isolated storage with undervoltagelockout strategy, the TEHG steadilysupplies a standardized 3.3 V voltage for commercial electronics. Furthermore,a TEHG-based self-powered system is demonstrated for drivingsensors to monitor meteorological information. The TEHG with DcPMT isadvantageous in broad-band and high-efficiency of wind energy harvesting,thus exhibiting a great potential for elevating the environmental self-adaptabilityand stability margin of the IoT.