A novel approach for weak current signal processing of self-powered sensor based on TENG

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.