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HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS

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HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS ( high-performance-triboelectric-nanogenerator-and-its-applica )

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(ADC) with a limited range of operation voltage - for instance, within ±10 V for most National Instrument DAQ devices. However, active open-circuit-voltage (VOC) signals from CS-TENG tend to be tens to hundreds of volts,10 as further evidenced by the top plot in Figure 42c for our key, and thus a voltage divider is required before connecting triboelectric devices to portable multichannel measurement systems. Considering that the functioning element in a triboelectric key, the CS-TENG, has an equivalent electrical circuit consisting of a voltage source and a serial variable capacitor, we proposed a capacitor-based voltage-dividing scheme, with its equivalent electrical circuits and typical voltage outputs from normal typing plotted in the bottom of Figure 42c. Two capacitors with rationally selected capacitance (C1: 330 pF, C2: 660 pF) are connected to the triboelectric key and only the voltage across C2 is measured as the output signal, which can be represented by (20) The divided voltage signal has been lowered to about 5 V while keeping the shape of the OCV as well as retaining all the keystroke information such as applied typing force and hold time. The consequent equivalent electrical circuit for a keystroke device consisting of multiple triboelectric keys is illustrated in Figure 42d. The analog voltage signals are measured by the ADC module and then sent to the Microprogrammed Control Unit (MCU) for subsequent processing and analysis, including the digital filtering, denoising, baseline elimination, feature extraction and so on. The electrical signals from the fabricated numeric keypad by sequentially inputting the digits “8-3-7-5-0-9-2-4-1-6” are plotted in Figure 42e. Each typed digit is clearly recorded by the voltage change in the V= VOC(t) C 1C (t)+1C +1C  2 TENG 1 2 114

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