基于压电材料的振动能量收集试验研究

Experimental Study on Vibration Energy Collection Based on Piezoelectric Material

针对设备状态监测与故障诊断实时监测的要求,以应用于无线传感器网络节点供电为目的,根据材料的压电特性及其等效电模型,设计出将振动能转化成电能的能量收集的试验系统。该试验系统由压电片、振动台、整流转换、充电电路以及可充电锂离子电池等组成。以整流电路、开关控制部分,结合超级电容,设计出基于压电材料的振动能综合转换收集试验方案,制作出小型设备,通过试验验证其应用的可行性,记录并分析试验数据。试验表明,振动能量能够被有效地转化为电能并先储存于超级电容中,后由开关系统控制充电芯片实现断续充电,将电能储存至锂电池中。

Based on the piezoelectric characteristics and equivalent electrical model of the material, an experimental system has been designed to convert the energy of vibration into the electric power. The experimental system takes the real time requirement of condition monitoring and faults diagnosis as background and aims at the application of the power supply for wireless sensor network nodes. It consists of piezoelectric ceramics, vibration shaker, rectifier converter, charge circuit, Lithium battery, etc., the experimental scheme is accomplished to convert and collect the vibration energy of the piezoelectric material with synthesizing rectifier, switching part and super capacitor. A small device has been analyzed and verified with experiments and the recorded data. The experiment shows that vibration energy can be converted to electrical energy and then electrical energy is stored in Super Capacitor, intermittently charged through switching part into charge chip, and stored in a lithium battery.