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(Mg1/3Nb2/3)O3-PbTiO3(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.　©　2024　Science　Press.　All　rights　reserved.