A novel approach for weak current signal processing of self-powered sensor based on TENG. (1st December 2022)

• Record Type: Journal Article
• Authors: Lu, Shan; Lei, Wenqian; Wang, Qi; Liu, Wenqiu; Li, Kecen; Yuan, Pengfei; Yu, Hua
• Is Part Of: Nano energy. Volume 103(2022)Part A
• Publication Date: 2022-12-01
• Subjects: Triboelectric nanogenerator -- Weak current signal measurement -- Impedance transformation -- Self-powered sensors -- Signal sample; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2022.107728
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Triboelectric nanogenerator (TENG) is a new high-efficiency electromechanical conversion mode proposed in recent years. When triboelectric nanogenerator is used as sensor, like other types of sensors, it can use current signal as sensing signal, but it outputs weak current signal with high impedance, which is not conducive to direct application. In this paper, a preprocessing method for weak current signal is proposed. The I/V conversion measurement method and the direct measurement method are theoretically analyzed, and the principle of parameter selection of circuit components is provided respectively. After that, the experiment of Contact Separated Triboelectric Nanogenerator (CS-TENG) is used to verify that the proposed I/V conversion measurement method has higher accuracy than the direct measurement method, and then the Rotary Triboelectric Nanogenerator (R-TENG) and the single electrode triboelectric nanogenerator (S-TENG) are used further verifies the design theory of the I/V conversion measurement method. Finally, it is concluded that the I/V conversion measurement method can convert the high impedance weak current signal output by TENG into a low impedance low voltage signal. Through reasonable component parameter selection, the measurement error can be controlled within 6 %, which can not only be used in current signal extraction of TENG, but also be expected to be used for current signal characterization in TENG when TENG is used as an energy harvester. Graphical Abstract: An I/V conversion measurement method on the output current signal of the TENG sensor is proposed, which converts the high-impedance weak current signal output by the TENG sensor into a low-impedance and low-voltage signal, which can achieve more accurate current signal measurement. The current measurement scheme can completely restore the current change waveform output by the TENG sensor with small errors, which improves the portability and practicability of the TENG sensor. At the same time, this provides a new method for the extraction of the current signal of the TENG sensor, and can also be applied to the current signal characterization of the TENG when it used as an energy harvester. ga1 Highlights: The proposed method can accurately sense the current signal of the TENG sensor with high accuracy and low cost. The proposed method can be used as a universal approach for extracting the current signals for different kinds of TENG sensor. The proposed method is expected to be applied to the characterization of current signal in TENG when it used as an energy harvester.