建立了悬臂梁单晶压电振子的发电测试系统,针对压电晶体与磷青铜基板材料的厚度比对单晶压电振子输出电压的影响进行了有限元分析,得出了压电晶体与磷青铜基板材料的最佳厚度比并进行了实验验证,同时对具有最佳厚度比的单晶压电振子进行了压电发电能力测试。研究结果表明,当压电晶体与磷青铜金属基板的最佳厚度比为0.5时,单晶压电振子的输出电压最大,有限元分析与实验结果基本吻合。单晶压电振子输出电压随着负载的增大而增大,而输出功率并不随负载的增大而增大。压电振子存在一个最佳负载,当负载与压电振子内阻相匹配时,输出功率最大,能量转化效率最高。单晶压电振子在负载为50 kΩ时,输出电压最大可达5.4 V;当负载电阻为10 kΩ时,负载与压电振子内阻匹配良好,输出功率达到最大为1.18 mW,产生的能量能满足网络传感器等低耗能电子产品的供能需求。

With the aim to measure and study the electricity generating performance of Piezoelectric Ceramics(PEC),a measuring system for the electricity generating capacity of the PEC is developed. A piezoelectric cantilever dibrator is designed and the effect of Optimal Thickness Ratios(ORT) of the PEC to the metal plate on the piezoelectric dibrator is analyzed by Finite Element Method(FEM). The results show that the output voltages and power are maximal at the resonance frequency. The ORT of the piezoelectric cantilever dibrator is 0.5 obtained by FEM,which is consistent with the experimental results. Moreover,the output voltages of the piezoelectric cantilever increase as the resistive load increases,and the voltage approaches to 5.4 V when the resistive load is 50 kΩ. Nevertheless,the electrical power decreases when the load resistances are further increased,and the maximal output power is about 1.18 mW from the piezoelectric cantilever in a resistive load of 10 kΩ at the resonance frequency.Experiments show this power level is high enough for some wireless communication systems.