Feature: LEDs
Figure 4: MSW-TENG as a traffic safety light baton: (a) Schematic of the MSW-TENG-type light baton; (b) The baton powering a 100-LED array; (c) VOC
and (d) ICC vibration frequency the VRMS and IRMS length. Both VRMS
outputs as a function of the outer electrode’s and IRMS
increase as the electrode length
increases as more area is exposed to the air, yielding a larger potential difference. Te length of the PFA cylinder is also a key parameter in fabricating the MSW-TENG, because a long cylinder creates more charge separation inside the water.
High output Te proposed MSW-TENG can produce high electrical output with low input frequency of 1-3Hz and is lightweight, because only 10mL of water is used, making this device suitable for portable applications, such as a traffic baton, for example – see Figure 4a. Here, the PFA cylinder and electrodes are covered with red plastic. A 100-LED array is connected to each generator, powered when the water contacts the electrode. Even at low frequency, when the water lightly touches or falls from the top and bottom of the cylinder, all LEDs are lit. Figures 4c and 4d show the output VOC and ICC depending on
the input frequency. Te output increases with increasing input frequency because the higher mechanical input leads to higher- velocity water movement, which increases the number of times the water contacts the electrode.
EW-DEC21-Alpha 3_Layout 1 13/01/2022 14:33 Page 1
of MSW-TENG, depending on the mechanical
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