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 piezoe-lectric energy harvesting.To this end,a new method for increasing the power of piezoelectric energy harvesting based on Sm-doped Pb(Mg1/3Nb2/3)O3-PbTiO3(Sm-PMN-PT)material and improved double intermediate capacitor harvest-ing(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 im-proved-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 bi-morphs 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.
关键词
电力传感器/压电取能/功率提升/Sm掺杂PMN-PT/接口电路
Key words
power-specific sensor/piezoelectric energy harvesting/power improvement/Sm-doped PMN-PT/interface circuit
维普
万方数据