Design And Application Of Hybrid Generator For Wind Energy Collection

With the development of the world economy and society,the crisis of energy supply shortage becomes seriously.Excessive exploit of fossil energy has led to the deterioration of human living environment.The development and utilization of new energy,energy conservation and emission reduction have become major problems that must be solved in the process of human growth.The various energy widely distributed in the environment is captured and converted into electrical energy,therefore developing maintenance-free sustainable nano-energy and realizing self-powered micro-nano energy system.In 2012,the Professor Zhong Lin Wang’s group of Georgia Institute of Technology invented a triboelectric nanogenerator(TENG),based on the coupling of electrostatic induction and triboelectricity,which can convert mechanical energy into electrical energy.This new type of generator can be used to harvest various forms of energy,such as,human motion,mechanical motion,rotation,wind energy,raindrops and waves,etc.In addition,TENG convert all kinds of energy into electrical signals through the surrounding environment and supply power to the back-end load by the power management circuit.The output signal of TENG is alternating current.However,microelectronic components require stable DC power supply and cannot use the output signal of TENG directly.Therefore,the voltage needs to be stepped down and regulated.The most common method is to use a buck regulator circuit.Power management circuits combining rectifier circuits and buck regulator circuits have been widely used for energy harvesting.However,too many discrete components in the power management circuit will also cause the energy loss of the TENG,which brings inconvenience to the back-end electronic equipment.Aiming at the problem of automatic tuning control of the electronic switch in the power management circuit(PMC)of the triboelectric nanogenerator at present,this paper proposes a friction-electromagnetic hybrid generator(ST-TEHG)under monostable operation to collect and stabilize the voltage of electric energy.The core part of the PMC is that the electromagnetic generator(EMG)drives the 555 timer module to control the square wave signal of the turn-on and turn-off of the switch(the frequency is adjustable at 1-100Hz),which realizes the self-trigger function of the electronic switch,and then regulates the process of mechanical energy to electrical energy capacitance charging and discharging.The paper systematically studies the influence of capacitance,inductance,resistance and other parameters in the whole PMC,and selects the best performance parameter ratio for PMC design.The experimental results show that the square wave voltage output by EMG driving555 timer module is stable,and the duty cycle is tunable in the range of more than 50%;The overall PMC output stable voltage is 4.47 V,ripple voltage is 0.03 V,and ripple coefficient is 0.52%.This work improves the design of generator PMC based on the concept of electronic switch self-trigger,and ST-TEHG can be widely used in the field of wind energy collection in the environment,and can meet the basic power supply requirements of micropower electronic equipment,with practical application value and future development potential.