A power harvesting system consists of cross-distributing bimorphs with high real powerdensity

Abstract

The traditional battery gradually cannot play the role of the power source of remote micro-sensors and embedded microelectronic devices due to their rapid development. To power the microelectronics by harvesting the environment vibration energy becomes a popular technology. The piezoelectric energy harvesters are very promising because of their high efficiency. In order to protect the harvesting elements from collision, the safety working space of the harvesting structure should be taken into account of the output power-density. The real output power-density is introduced, which considers both piezoelectric body and safety working space. A power harvesting system consists of cross-distributing bimorphs with high real power-density is developed. The structure and working principle are introduced. The differences of working space requirement between the cross-distributing harvester and the traditional one are analyzed. The numerical result shows that the cross-distributing method can greatly improve the real power-density of energy harvesting system.