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.