高准确度有效值转换电路的设计与实现

ELECTRONICMEASUREMENTTECHNOLOGY33620106陈仁伟朱长青岳夕彪(军械工程学院石家庄050000):,,,LMC6482AD637:,AD637:;;LMC6482;AD637:TM930.2:BDesignandrealizationofmeasurementcircuitonprecisetrueRMSChenRenweiZhuChangqingYueXibiao(OrdnanceEngineeringCollege,Shijiazhuang050000)Abstract:TheRMSwaswidelyusedinthemeasurementofelectricalparameters.TheaccuracyoftheRMSislowinordinarymeasureway.AccordingtothetheoryofaveragevaluemethodandTrueRMS,anprecisionrectificationcircuitusingamplifierLMC6482insteadofdiodeandanhighaccuracyTrueRMScircuitbasedonAD637aredesigned.Experimentationshows,bothofcircuitshavehighaccuracy.Therectificationcircuitonlyappliestothestandardsignal.However,theTrueRMScircuithaswiderapplyingscope.ThedesigncouldbeusedforreferenceinthedesignofMult-imeterandsomefunctionrelatedtotheRMSmeasurementinvirtualinstrument.Keywords:precisionrectificationcircuit;True-RMS;LMC6482;AD6370,,(VRMS)(ŠV)(VP),,[1],,,,,,[2],,,,,[3]11.1,,11CMOSLMC6482AINE,(),#20#陈仁伟等:高准确度有效值转换电路的设计与实现6,:,A:Uout1=UIN@R2R1+R2=UIN2(1)A2:Uout2=Uout1@1+R5(R3MR4)-UIN@R5R3=UIN(2),UOUT2UIN,,,A:Uout1=0(3)A2:Uout2=-R5R3@UIN=-UIN(4),UOUT2UIN,180b[4]TFG2001B,TektronixTDS1012,0.5V,50Hz222,(:0.6~0.8V),,,,,,Kf1.111[5],111.111D=50%1D=25%2D=1%101.1551.155,,,,,,,1.21.2.1:VRMS=1TQT0u2(t)dt(5):VRMS=u2(6),,/yy0,:,A/D,,/yy0,,,A/D[6-7],AD6371.2.2AD637AD637/0~2V,[0.02%,,60dB,KP=10,1%1%,#21#33电子测量技术10(KP=1/1%=10)1~3,5,AD637,VIN=200mV(RMS),600kHz;VIN1V(RMS)8MHz0~7V(),,?3~?18V1.2.3AD637AD637DIP-14,5:(1);(2)/;(3);(4);(5)A1A2I1,//I4:I4=I21I3(7)I4A4CAV(S=r5#CAVmT),A4V0I4V0I3,A3/,:I3=AVgI21I4=I1(RMS)(8)V0=VIN(RMS)(9)AD637AD63733AD637,AD637:(13)33LF,C6CAV,,,,C8R2R3CAV,,[8]C2C4C3C5,,,C7,,:(13),WR190V1V,WR291.000V1.2.4(13)TFG2001B,(14)TektronixTDS1012FLUKE8508A,0.4V,50Hz44AD6374,AD637,51/20.40019,0.0475%50~20kHz,0~2V,,0.1%2LMC6482,,AD637,,(下转第26页)#22#33电子测量技术2),,,,,3SLD,,,MATLAB,,PI[1],,.SLD[J].,2006,25(6):28-30.[2],.[J].,2001,22(6):29-31.[3],,.PID[M].:.[4],,,.SLD[J].,2005,26(7):689-691.[5],,.[J].,2004(4):27-29.[6],.[J].,1995,23(11):77-79.[7],,.[J].,2006,32(3):324-327.[8].[D].:.,,,(上接第19页)[1].[J].,2008(11):1-4.[2].[M].:,2007:410.[3],.[J].,2008,48(12):47-51.[4]HP.TheoryofOperationfortheHP8791Models7/10/11/21FrequencyAgileSignalSimulator[Z].[5],.DDS[J].,2007(9):137-139.[6],.[J].,2007,29(5):77-80.[7].[J].,2009,23(3):1-8.[8]./[J].,2008(5):1-4.,,1979,E-mail:[e-mail](上接第22页)[1].[J].,2009,36(3):42-43.[2].[J].,2004,22(3):97-99.[3].USB[D].:,2008:48-50.[4],.[J].,2008,31(4):1144-1146.[5].AD636/[J].,2002,9:66-68.[6].[J].,2008():62-65.[7],,,.[J].,2001,31(5A):117-119.[8].AD637[J].,2008,11:57-58.,,19851,,,E-mail:[e-mail]#26#