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:863B(2006AA04Z367):2009-11-26:(1984-),,,,。1(BLDCM),,。、:A/D、,、;PWM,。22.1ACS712,、、。5V,,5μs,,,,185mV/A,1.5%。1。1,23,4,7,185mV/A。UoIinUo=2.5+0.185Iin。ACS712,,;6,。2.2A/DAD74720~2.5V,UoA/DUadin,、、AD623,Uo。AD623,,,,,,。2。1,2,1,1,2,1(1.,130033;2.,100049):、(BLDCM),,,,,,、。FPGA,A/D、,、。PWM,。,、、,。:;;;:TP202:A:1000-100X(2010)05-0041-03ResearchofHighPrecisionBlushlessDCMotorCurrentSamplingMethodLIFeng1,2,WUYi-hui1,WUJun-feng1,2,LIHai-wen1(1.ChangchunInstituteofOptics,FineMechanicsandPhysics,CAS,Changchun130033,China;2.GraduateSchoolofCAS,Beijing100049,China)Abstract:Inordertomeasurewinding’scurrentofblushlessDCmotor(BLDCM)real-timeandaccuratelyforcurrentloopofthedigitalcontrolsystem,acurrentsamplingschemeforBLDCMofhighintegrationandhighaccuracyisproposedbasedontheanalysisofusualmethodsofcurrentsampling.Thisschemeovercomestheeffectofdiscretecomponent’stemperaturedriftandpowertransistor’sswitchingnoisebyusingFPGAcontroller,integratedchipsandPWM-midpointsamplingmethod.Theexperimentalresultsshowthatthecurrentsamplingsystemhashighlinearity,highaccuracyandre-al-timeperformance.Keywords:blushlessDCmotor;currentsampling;currenloop;highaccuracyFoundationProject:SupportedbyNationalFoundationof863Btype(No.2006AA04Z367)1ACS71244520105PowerElectronicsVol.44,No.5May,20104144520105PowerElectronicsVol.44,No.5May,2010AD623GRG,:RG=100G-1(kΩ)(1)UoUin:Uo=GUin(2)3。2.5V2.5V,,Uadin:Uadin=0.185GI(3):①,,;②Uadin0~2.5V,Iin,RG;③ACS712AD623,,,PCB;④,,,,。2.3FPGAA/DFPGAA/D,A/D,VHDLA/D。FPGAAD747212、、A/D,4。AD74722.7~5.25V,1.5Msps,、-1MHz。,FPGA。AD7472CONVST,CS,RDCLKin,25MHz,FPGA。BUSYA/D,6(0~2.5V),3Uadin。CONVSTA/D,,BUSY,BUSY,。14,560ns。CS,RD,4CS,RD。A/D:①,3.3VFPGA,2.5V2.5V;②FPGA,,;③A/D,CONVST,,。33.1,,。,、PI,。、,,。,。MOSFET,MOSFET,,,;MOSFET24kHz,,。,,MOSFET,,。3.2PWMMOSFET,PWM,MOSFET,MOSFET,,。,。PWM,PWM[1]。,A/D,,PWM。MOSFET,,。4FPGAAD747232AD62342,,PWM,,,。5。AD7472,CONVST,,VHDL,,CONVST,A/D。3.3,,,,PCB。,。,。,RC。,[2]。、、、。A/D,,。6。FIFO,,,,n,,。,,,。4:4,24V,0.2A,0.042N·m/A,3.2×10-5kg·m2;(3),RG,,0~0.9A,A/D000H~FFFH,0~4095。,IA/D。724kHz,I=0.2AA/D,5%,。1IN。,8,0.1%。。5ACS712,AD623AD74723、,,,,,FPGAA/D。PWM,,。,,,,。[1].[D].:,2006:52-53.[2].[M].:,2007.5A/D1A/DI/mA20406080100120140160180200N2283023724435246066917788569598N-I7I=0.2AA/D643
本文标题:直流无刷电机高精度电流采样系统设计
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