Design Of Wireless Power Transmission System Based On Triboelectric Nanogenerator

‘Green' energy harvesting technologies have great attention owing to their great potential in tackling the crises of energy shortage and climate change by providing sustainable energy for the rapidly increasing number of personal electronic devices,sensors and other components that comprise the Internet of Things(Io T),wearable/portable electronics.The triboelectric nanogenerator(TENG)is a recently-invented energy harvesting strategy based on the combination of triboelectrification and electrostatic induction effects,and has the merits of being low cost,high power output and energy conversion efficiency with wide choices of tribo-materials.With high level of power output,it is possible to use TENGs as an energy source for applications such as self-powered sensing,wearable electronics and Io T devices.However,these typically involve multiple energy conversion processes: mechanical energy to electricity conversion,storage and voltage regulation to power electronics.The energy conversion at each stage results in energy loss,thus significantly reducing total energy efficiency.Here,we propose a Magnetic Resonance-based Wireless Triboelectric Nanogenerator(MR-WTENG)which could not only collect the energy output of TENGs wirelessly but directly use the harvested energy as wireless sensing signals.The main research work and contribution were as follows:(1)Analytic models of the oscillating and coupled voltage signals for the wireless energy transfer are developed,showing excellent agreement with the experimental results.This can be transmitted wirelessly from the transmit coil to the resonant-coupled receiver coil with an efficiency of 73% for a 5 cm distance between the two coils(10 cm diameter).(2)Three applications are demonstrated to show that MR-WTENG could wirelessly provide power: lighting up an LED array,charging up a capacitor,and wireless energy collection from a MR-WTENG integrated in a shoe to power a watch.(3)Apart from the direct use of TENG as a wireless sensor,an impedance modulation circuit is another possible configuration for a fully self-powered wireless sensing application.By using capacitive type sensors or inductive sensors,the frequency of the transmitted signal will be affected.Thus the purpose of the sensing is achieved.