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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. 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. [Display omitted] • 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. [ABSTRACT FROM AUTHOR]

In recent years, triboelectric nanogenerator (TENG), as a sensor with promising future, is expected to be widely used in many fields. However, the output of TENG has the characteristics of high voltage (> 10–100 V) and high impedance (in MΩ–GΩ), which hinder the TENG's applications in sensor with considering the operation voltage of conventional electronic components. In this work, two front-end voltage signal processing circuit schemes are proposed, which can convert the high-impedance and high-voltage signal output from TENG into a low-voltage and low-impedance signal. First, we analyzed the circuit model by measuring the output voltage of the TENG sensor and explained the influence of the input impedance of the measuring device on the measurement accuracy. Then, we proposed two kinds of linear voltage signal processing methods which have been demonstrated the feasibility for a contact-separation mode TENG and a rotating type TENG. Finally, we applied the designed front-end signal processing circuit to a portable measurement system, which can measure the voltage signal up to 100 V output from a sliding mode TENG for local display or transmission to receiving terminal wirelessly. These two front-end voltage signal processing circuit solutions have the advantages of structure simplicities and cost-efficiency, and they can be used in combination with common electronic systems. The method can help with various practical TENG-based sensor applications and also provides an economical and simple solution for TENG voltage measurement. Two front-end voltage signal processing circuit schemes and linear voltage signal processing methods are proposed, which can convert the high-impedance and high-voltage signal output from TENG into a low-voltage and low-impedance signal. These two front-end voltage signal processing circuit solutions have the advantages of structure simplicities and cost-efficiency, and they can be used in combination with common electronic systems. The method can help with various practical TENG-based sensor applications and also provides an economical and simple solution for TENG voltage measurement. [Display omitted] • Two regulating methods catering to the characteristics of high voltage and high impedance of TENG sensors were proposed. • A high-accuracy small signal circuit towards TENG was designed to replace specialized expensive measuring instruments. • An economical and exquisite solution for signal measurement is conducive to the practical application of TENG sensor. [ABSTRACT FROM AUTHOR]