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when connected to a 20 MΩ external resistor over a 5-seconds interval respectively. The results clearly show that the work done per cycle (the area of a cycle in the plots) varies greatly and it would be insufficient to randomly chose a cycle length for Δt. The validity of the measured V-Q plot is proven by Figure 12c, which presents the short-circuit and open-circuit V-Q plots of the MA-TENG under 2.5 Hz vibration. In open-circuit condition, the transferred charge would be zero and the plot is nearly a vertical line at Q=0; while in short-circuit condition, the output voltage would be zero and the plot is nearly a horizontal line at V=0. To determine the proper length of time interval for calculating the average power, a convergence study by averaging the electrical work done over different time intervals was proposed and conducted, with results shown in Figure 12d. For both SR- TENG under 3.5 Hz vibration and MA-TENG under 2.5 Hz vibration, the average output power with an external load of 20 MΩ reaches a steady state when the interval approaches 30 seconds. Considering that 3.5 Hz and 2.5 Hz are the lowest ambient vibration frequencies to generate notable electricity from SR-TENG and MA-TENG respectively, it is adequate to choose the 30-seconds length for Δt in calculating the average power when the TENGs are connected to various external loads under different vibration frequencies. 38PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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