Research On Power Conversion Efficiency Of Magnetoelectric Gyrator With High Mechanical Quality Factor

The ideal magnetoelectric(ME)gyrator has many outstanding advantages,such as passive、linear、lossless and nonreciprocal,so it can complete the direct conversion of I-V/V-I,accompanying the non-reciprocal transition of capacitive circuit behaving inductively.It can replace the key modules of radar communication converter,circulator and isolator,which is conducive to the development of high frequency signal conversion and miniaturization.Although important breakthroughs have been made experimentally and theoretically in power conversion efficiency aspect of ME gyrator in previous reports,the further improvement of the power conversion efficiency of ME gyrator has been restricted by the low effective mechanical quality factor Q value of ME material and piezoelectric material used in the study.In order to solve this problem,by improving the effective quality factor of a 2-2 ME gyrator laminated by Fe-Ni-based constant elastic alloy(Ni-Fe-Cr,Q_m=1082)and piezoelectric material(PZT8,Q_P=1200)is proposed and designed to realize the high efficiency power conversion efficiency.And in our designed double-port four-wire ME gyrator of Ni-Fe-Cr/PZT8/Ni-Fe-Cr with sandwich structure,high effective dynamic magnetic-mechanical-electrical conversion(194V/(cm Oe))is produced when these two materials of high Q values work at resonance,due to their high effective quality factor(Q=1080).Therefore,this method can effectively reduce the energy loss in the magnetic-mechanical-electrical conversion process,and further improve the power conversion efficiency of the ME gyrator.In this paper,the dynamic magnetic-mechanical characteristics,low-frequency/resonant magneto-electric response and power transmission characteristics of the sample have been characterized by building an automatic test system,and the experimental results show that power conversion efficiency of ME gyrator designed reaches 88.5%under an extremely low input density of(3.31μW/cm~3).Advances and breakthroughs of related research not only accelerate the realization of compact,passive and non-reciprocal functional ME solid devices,but also have potential applications in signal transmission,impedance matching and power transmission,etc.