Impact micro-energy harvesting array structure

Abstract

The invention discloses an impact micro-energy harvesting array structure which mainly comprises a base and a harvesting unit array fixed onto the base, each harvesting unit comprises a flexible belt, a substrate, a piezoelectric composite beam, a mass block and an impact stopper, each mass block is connected with the corresponding substrate through the corresponding piezoelectric composite beam, each impact stopper is fixed onto the corresponding substrate, each substrate is fixed onto the base through the corresponding flexible belt, and the lengths of the flexible belts of the units are slightly different. Under the action of environmental vibration and wind, the harvesting units differently swing and mutually impact, the mass blocks and the piezoelectric composite beams vibrate by the aid of impact force, and vibration energy is further converted into electric energy by a piezoelectric layer on each composite beam. The impact micro-energy harvesting array structure is capable of simultaneously harvesting the vibration energy and wind energy, is high in harvesting efficiency for common low-frequency and broadband vibration energy and low-medium speed wind energy in environments, has higher environmental adaptability and wider application range for a current micro-energy harvesting system only harvesting the vibration energy or the wind energy, and can promote an MEMS (micro-electromechanical system) energy harvesting system to be widely applied to the field of wireless sensing and the like.

Description

technical field [0001] The invention belongs to the field of renewable energy, in particular to a micro-energy system based on micro-electro-mechanical systems (MEMS, Micro-Electro-MechanicalSystems) technology. Background technique [0002] The micro energy harvesting system based on MEMS technology can convert mechanical energy, thermal energy, electromagnetic energy (including light energy) in the environment into electrical energy. Compared with traditional batteries, it has small size, low cost, long life, easy integration, and no need It is especially suitable for powering wireless sensor nodes, portable electronic products, etc., and has attracted extensive attention from domestic and foreign scholars in recent years. Due to the widespread existence of vibration energy and wind energy in the environment, a lot of research has been carried out on MEMS micro vibration energy harvesting systems and MEMS micro wind energy harvesting systems at home and abroad. [0003] M...

AI Technical Summary

Problems solved by technology

However, the current wind energy harvesting system based on MEMS technology still has problems such as high working wind speed and low output power, and there is still a big gap from the actual application requirements.

[0004] It can be seen from the above analysis that in order to be applied in wireless sensing, portable electronic products and other fields, the collection efficiency of MEMS micro-vibration energy collection system for low-frequency and broadband vibration energy needs to be improved, and the collection efficiency of MEMS micro-wind energy collection system for medium and low-speed wind energy needs to be improved

In addition, vibration energy and wind energy often exist in the environment at the same time, but the micro energy harvesting system reported so far only collects one of them

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