Investigation On The Small Amplitude Mechanical Energy Harvester Based On Electromagnetic-Triboelectric Hybrid Generator

Electronics is developing toward miniaturized integration,functionality and wireless portability.With the increasing demands for self-powering in the Internet of Things era,the eco-friendly and sustainable energy supply for millions of sensors has become a major issue that should be addressed urgently.There are all kinds of mechanical energy in our ambient environment,such as waves,human motion and bridge vibration.It is an important way to solve the problem of powering electronic products by effectively harvesting the mechanical energy in the era of Internet of things.Electromagnetic generator(EMG)and triboelectric nanogenerator(TENG)are two kinds of vibration energy harvester.The EMG is a traditional energy harvest device,which is based on the electromagnetic induction law proposed by Faraday in 1831.As a new type of power generation technology,TENG has attracted growing attentions for the great advantages such as simple-structure,high power density and wide selection of materials.It has been widely used in micro/nano power sources,self-powered sensing,blue energy,and high voltage sources since invented in 2012.This paper mainly studies on the basic characteristic of two kinds of energy harvester which are based on the law of electromagnetic induction and Maxwell’s displacement current,respectively.Focusing on the law of the output power of the two energy harvester under the condition of different amplitude,moveover,we integrated two kinds of vibration energy harvester,designed hybrid vibration energy harvester device.The main contents include:1.We first give a theoretical comparison of the EMG and TENG in their opencircuit voltage and short-circuit current,and verify it by experiment.2.The relationship between the maximum average output power and the motion amplitude of the two generators is theoretically studied when the frequency is constant,and verified by experiment.With the increase of the amplitude,the maximum output power of the TENG rapidly grows to saturation,while that of the EMG is proportional to the square of the amplitude when the frequency f remains constant.3.Based on this,we take the two generators into consideration to find their own dominant scope: the lower the frequency,the larger the advantage scope of TENG at small-amplitude,demonstrating that the TENG has dominant scope low-frequency and small amplitude,and the EMG has dominant scope high-frequency and large amplitude.4.A hybrid structure by integrating the EMG and TENG are designed and fabricated,it is proved that the two parts of the generator can work together to make up for each other through experiment of the mechanical vibration simulation.5.Finally,the prospect of TENG as a milestone in power generation,which has drawn an entirely new pattern for effectively harvesting mechanical energy in two dimensions.All these remarkable merits will guide the development prospects of TENG as a foundation of the energy for the new era.