基于Sm-PMN-PT和改进型DICH接口电路的压电取能功率提升方法

Improvement Method of Piezoelectric Energy Harvesting Power Based on Sm-PMN-PT and Improved-DICH Interface Circuit

通过压电取能方式将电力设备表面的机械振动能转化为电能,是实现电力专用传感器无源化的有效途径之一。然而,传感器高集成度和小型化发展趋势对压电取能功率提出了更高要求。为此,提出一种基于钐掺杂铌镁酸铅-钛酸铅(Sm-doped Pb(Mg_(1/3)Nb_(2/3))O_(3)-PbTiO_(3),Sm-PMN-PT)材料和改进型双中间电容回收(improved double intermediate capacitor harvesting,improved-DICH)接口电路的压电取能功率提升方法。首先,制备了不同Sm掺杂质量分数为x和PT质量分数为y的xSm-PMN-yPT压电双晶片,并对压电材料的性能参数进行了测试和对比;其次,在对比分析几种典型接口电路的基础上,设计了一种改进型DICH接口电路,并从理论上进行了取能功率的对比分析;然后,采用Multisim软件对不同接口电路的取能功率进行了仿真分析;最后,对Sm-PMN-PT压电双晶片和锆钛酸铅(Pb(Zr1–xTix)O3,PZT)压电陶瓷在不同接口电路下的取能功率和能量提取效率进行了对比测试。研究结果表明:基于2.5%Sm-PMN-32%PT材料和改进型DICH接口电路的压电取能装置具有516.3μW的高输出功率、61.1%的高能量提取效率和较强的负载适应性,在取能领域具有良好的工程应用前景。

Converting mechanical vibration energy on the surface of power equipment into electrical energy by the way of piezoelectric energy harvesting is one of the effective ways to realize the passivity of power-specific sensors. However, the development trend of high integration and miniaturization of sensors has put forward higher requirements for piezoelectric energy harvesting. To this end, a new method for increasing the power of piezoelectric energy harvesting based on Sm-doped Pb(Sm-doped Pb(Mg_(1/3)Nb_(2/3))O_(3)-PbTiO_(3),Sm-PMN-PT) material and improved double intermediate capacitor harvesting(improved-DICH) interface circuit is proposed. Firstly, xSm-PMN-yPT piezoelectric bimorphs with different Sm doping ratios (x/%) and PT contents (y/%) are prepared, and the performance parameters of the piezoelectric materials are tested and compared. Secondly, on the basis of the comparative analyses of several typical interface circuits, an improved-DICH interface circuit is designed and the comparative analyses of energy harvesting are carried out from the theoretical point of view. Thirdly, the Multisim software is used to simulate and analyze the energy harvesting of different interface circuits. Finally, the energy harvesting power and energy harvesting efficiency of Sm-PMN-PT piezoelectric bimorphs and Pb(Zr1-xTix)O3 (PZT) piezoceramics under different interface circuits are tested comparatively. The results show that the piezoelectric energy harvesting device based on the 2.5%Sm-PMN-32%PT and improved-DICH interface circuit has the advantages of high output power of 516.3 μW, high energy harvesting efficiency of 61.1%, and strong load adaptability, hence has a bright prospect for engineering applications in energy harvesting.