Self-power System Design Of Multi-pulse Triboelectric Nanogenerator Based On Micro-gap Discharge

Because the emerging technologies such as Internet of Things（Io T）,mobile transportation and wearable devices,ubiquitous distributed sensors are the key technology for acquiring information under the Internet of everything.Sensors have the characteristics of large number and random distribution,and their power supply problem has become the bottleneck problem.The power supply mode of traditional wiring is limited by space scale,while the battery power supply mode is limited by time scale.To solve the above problems,triboelectric nanogenerator（TENG）coupled with triboelectric and electrostatic induction was proposed in 2012,which can collect low-frequency and irregular micro-energy widely existing in the environment.Through effective energy management measures,it is expected to realize the self-power of sensing nodes.Break the limitation of space and time scale,and form an all-weather information interaction network.However,the inherent capacitance theoretical model of TENG has the output characteristics of large open-circuit voltage（Voc）,small short-circuit current（Isc）and high equivalent internal resistance,which hinder its practical applications.The output performance of TENG is optimized by increasing the surface charge density.When the surface charge density increases to a certain extent,air breakdown between the dielectric is easy to occur,which leads to the dissipation of the charge energy.How to overcome the air breakdown effect on TENG output performance,to maximize the friction generated charge for effective power output,is a hot issue in TENG field researchTherefore,in this paper,the micro-gap structure is connected in series to the back-end circuit of TENG,and the passive dielectric air breakdown is transformed into active micro-gap induced alternating negative corona discharge,which increases the energy conversion efficiency by taking advantage of TENG’s natural high voltage and the strong electric field aggregation ability of micro-gap.It is named multi-pulse triboelectric nanogenerator（MPTENG）because of its output characteristic of Trichel pulse.The influences of the number of discharge electrodes,the sharpness of discharge electrodes and the thickness of dielectric on the output performance of MP-TENG are investigated to achieve controllable and predictable MP-TENG.The experimental results show that the monopole corona has the advantage of strong electric field,and MP-TENG produces higher output performance.The increase of the sharpness of the discharge electrode leads to the increase of Voc and decrease of Isc in MPTENG.The thickness of TENG dielectric determines the pulse width of the output voltage.When the pulse width is wide enough,the voltage at both ends of the micro-gap can be maintained for a certain time to induce corona discharge successfully.In addition,compared with the output performance of TENG,the electrical parameters Voc and Isc of MP-TENG in the optimal combination of MP-TENG increased by 154% and 725%respectively.Under the same vibration source environment,and the highest power growth rate reached 646% in the low-frequency mode.The time required to drive temperature and humidity（T＆H）sensor by charging the 100μF capacitor to 3.5V is reduced by 1/5,and 12 parallel LED integrated light boards（240 high light beads）are successfully lit.The proposed MP-TENG based on micro-gap corona discharge solves the problem that the output performance of traditional TENG is limited by air breakdown,and uses large voltage to create large current,which effectively improves the output performance and power supply capacity of TENG.It also provides a new idea for friction plasma source and further expands the application of friction plasma.