Multi-direction wideband energy harvesting device based on vibration friction

Abstract

The invention provides a multi-direction wideband energy harvesting device based on vibration friction. The multi-direction wideband energy harvesting device comprises quality blocks, springs, fixed baffles, upper electrodes, a friction substrate, lower electrodes and a base. One faces of the quality blocks are connected with one ends of the springs. The other ends of the springs are connected with the fixed baffles to form quality-block-spring-fixed-baffle structures, and the springs are horizontally arranged and fixed to the periphery of the base. The upper electrodes are arranged on the lower surfaces of the quality blocks. The upper surface of the friction substrate makes contact with the upper electrodes. The lower electrodes are arranged on the lower surface of the friction substrate and fixed to the upper surface of the base. The upper electrodes and the lower electrodes are led out through wires and connected with a processing circuit. When the device bears outside excitation from different directions, the springs drive the quality blocks to vibrate, the mechanical energy is converted into electric energy through changes of relative contact areas of the upper electrodes on the quality blocks and the friction substrate, and the electric energy is output through the processing circuit through the upper electrodes and the lower electrodes to be supplied to a power consumption device. Meanwhile, the inherent frequency of the spring-quality-block structures can be set, and wideband energy harvesting is achieved.

Description

technical field [0001] The invention relates to a multi-directional broadband energy collection device, in particular to a multi-directional broadband energy collection device based on vibration and friction. Background technique [0002] An energy harvester is a device that collects or collects the micro energy released in the surrounding environment, including light, heat and vibration, and converts it into electrical energy. Compared with traditional energy supply methods, such as transmission lines, batteries, etc., energy harvesters are not limited by connecting lines, and do not need to be replaced frequently, which effectively solves the inconvenience of replacement or maintenance costs caused by limited battery life in harsh environments high question. At present, the types of vibration energy harvesters mainly include electrostatic, electromagnetic and piezoelectric. The electrostatic vibration energy harvester has the disadvantages of complex structure and needs ...

AI Technical Summary

Problems solved by technology

The electrostatic vibration energy harvester has the disadvantages of complex structure and needs to start the power supply during operation, and cannot realize self-supply; the output voltage of the electromagnetic vibration energy harvester is low, which cannot meet the energy supply requirements of high-power consumption electronic equipment

[0003] The vibration source in the surrounding environment has a certain frequency bandwidth. When the frequency of the vibration source is consistent with the resonance frequency of the energy harvester, the piezoelectric vibration energy harvester has high collection efficiency; however, when the frequency of the vibration source deviates from the resonance frequency of the cantilever beam, the output The energy will be drastically reduced and the collection efficiency will be low

At the same time, the external vibration source is random vibration, and the vibration direction is not fixed. At present, most energy harvesters cannot meet the multi-directional broadband energy collection at the same time, resulting in low collection efficiency.

For example, in 2013, Zhang Haixia and others proposed a piezoelectric friction composite broadband energy harvester, which uses a piezoelectric array cantilever beam to vibrate and deform and collide with the friction substrate during the vibration process to generate electric energy. The electric energy generated by the piezoelectric effect is 320mV. The electric energy generated by electricity generation is 20V, which only realizes broadband energy collection in one direction, and there is a loss of mechanical collision energy in the process of collision and friction

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