压电叠堆式能量收集系统输出特性研究

Output performance of piezoelectric stacked energy harvester

研究了压电叠堆式能量收集装置的系统输出特性,考虑整流电路的作用,建立了压电结构的机电耦合动力学模型,获得了系统的输出电压和输出功率的一般形式。利用该模型分析了压电材料、激振频率、激振力幅值和负载电阻对系统输出性能的影响。结果表明,PZT-8压电材料较PZT-5A和PZT-4有着更好的系统输出特性;系统参数在和激振频率、激振力幅值、负载电阻等完全匹配时,输出性能最佳。

The output performance of piezoelectric stack energy harvester was studied, the energy harvester was connected to an AC-DC rectifier, and the electromechanical coupling dynamic model was proposed. The expression of the normalized output voltage and output power was established. The effects on the output power performance of piezoelectric stack physical parameters, such as piezoelectric material parameters, the amplitude and frequency of the exciting force, the load resistance of the system were analyzed. The results show that PZT-8 has a better performance compared with PZT-4 and PZT-5A, when the amplitude and frequency of the exciting force and load resistance is according with the system parameters, the optimal performance can be obtained.