谐振频率转换机制振动能采集器研究进展

环境振动能采集器可为低功耗系统提供绿色环保、可再生能源,具有寿命长久、能量密度高、微型、易集成等优势.能量采集环境具有随机振动频率低、频域广、振源幅值小且多方向性等特点,频率转换机制可有效解决采集器与环境振动频率不匹配问题,提高其能量转换效率.发电装置中的拾振结构频变方式主要分为接触式和非接触式,具体操作方法包括直接或间接碰撞拾振体、驱使振动体形变、磁力耦合调频等.综合比较了各类频率转换机制的优缺点及其实用性,指出了低宽频、高效能、智能化是未来振动能采集微电源的研究趋势.

Research progress in vibration energy harvester with resonance frequency conversion mechanism

The ambient vibration energy harvester as a micro power source can provide green environmental protection and renewable energy for the low-power system persistently,which has many advantages such as long life-span,high energy density,miniature and can be easily integrated,which are expected to overcome the drawbacks of the current traditional chemical batteries. The frequency of the broadband random ambient vibration are low,the amplitude of vibration source is small and vibrating in several directions. The energy harvester should match the ambient vibration frequency with the frequency conversion mechanism to increase the energy conversion efficiency. The frequency converter based on the picking vibration structure includes contact and non-contact mode and a direct or indirect collision course to adjust the picking vibration body deformation,magnetic coupling tuning and so on. Advantages,disadvantages and applications of all kinds of frequency conversion mechanism are compared. It refers that future research trend of the vibration energy harvesting micro power is low wideband,high efficiency and intelligentize.