Self-driven sensing system based on friction nano-generator

Abstract

The invention provides a self-driven sensing system based on a friction nano-generator. The self-driven sensing system comprises the friction nano-generator for converting external mechanical energy into electrical energy to output an electrical signal to an external circuit; a resistive sensor directly connected to the friction nano-generator in order that the friction nano-generator supplies power to the resistive sensor for detecting a sensing signal; and an alarm connected in parallel with the resistive sensor and used for giving an acoustic and / or optical alarm signal when the sensing signal is greater than a signal threshold. The self-driven sensing system does not need any external power supply, solves the power supply of the sensor, improves the adaptability of Internet of Thing equipment, and is greatly reduced in size and weight. The system is greatly improved in terms of stability and controllability. The friction nano-generator and the sensor are separated from each other so that a friction material and a sensing material do not affect each other, thereby expanding a material selection range and achieving a practical application value.

Description

technical field [0001] The invention relates to the field of sensors, in particular to a self-driven sensing system based on a triboelectric nanogenerator. Background technique [0002] With the continuous improvement of urban living standards and the continuous development of the economy, the intelligent Internet of Things has brought great convenience and a qualitative leap to human life. The Internet of Things uses information sensing devices or sensors to connect user subjects and the Internet for communication. , Identification, positioning, tracking, monitoring and management, by using a large number of independent sensors to replace traditional limited discrete sensors, using the Internet to collect scattered sensor signals for statistical analysis, accurate and reliable information can be obtained. However, for sensors that independently maintain their continuous work, the problem of power supply has become a bottleneck that restrains their network-based development....

AI Technical Summary

Problems solved by technology

First, the friction nanogenerator collects the mechanical energy in the environment, charges the capacitor after being processed by the rectifier bridge, and then outputs power to the sensor. This type of self-driven sensing system accommodates the rectifier bridge, capacitor, circuit, etc., which greatly increases the system. The size has great limitations in the application of the Internet of Things; secondly, the friction material of the friction nanogenerator is used as the sensing material at the same time, and the friction nanogenerator itself is regarded as the sensor device. When the sensing environment changes, the friction material The surface charge density changes, and its output changes, so as to achieve the purpose of sensing. However, due to high requirements on materials (both friction performance and sensing performance), and strong external influence, its selection range is small and its stability is poor. , while monitoring its output requires an external measurement and control circuit, it is not a self-driving system in the actual sense

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