测控电路试卷及答案

120112012A10044161234PWMPWM38241?23ABAB90BA901ABCDY1Y22YIY215123U3123U2U1ABY1Y2CD2325432121YYYYYYYYYsH)()(R1=33kR2=43kR3=68kC1=0.01uFC2=0.0015uF12151PWM2151UoU1U22310~40mVR4=40kR3=20kR1=R2=10kUo=5VRP20()R2R4R3R1NC1C2ui(t)uo(t)A1A2A3R1R2RPR3R3R4R4U1U2Uo3A4161234PWMPWMPWM8241ISUTRC23105Y1Y2A/ACDBY1Y24(9,6)732732211321232211332232122121322132121325432121102.28s10836s102.282.06-RRCC1sC1R1R1R1sRRCC1RRR1R1sCR1R1R1sCCR1R1R1R1sCsCR1R1R1R1R1-YYYYYYYYYsH.))))()(760Hzf294774102.28CCRR1721320.0623368RRKp13.182111AB-BC-CAAC-CB-BA251726361N1N2R1=R2N1N2N3O.1%KdKd321RUURPUU2RUUI1o11222oPR12P2oURP2RURPR2RU21P1oURP1RURPR1RU)()(121o2oUURP2R1R1UU))((12oUURp2R1R13R4RU30.408k~0.1611402050205000101014R3RUUUo2R1RRp12~620112012B10044161234/3824123ABAB90BA901ABCDEY1Y22YIY21520mV123123123RCY1Y2BAECDF71UoU1U22R4=40kR3=20kR1=R2=5kUo=1~5VRP151PWM215V1V2UiUdUc1Uc=1Ud=0Uo2Uc=0,Ud=1Uo3115AR3R4R5R6UiUoR2R1V1V2UcUdA1A2A3R1R2RPR3R3R4R4U1U2Uo8B41612xx348241+20dB/10090090-18023872Y1Y218PiiooRRuuRuuRuuI12221121ABCDEFY1Y2ABCDEFY1Y2921111iPiPPuRRuRRRu12222iPPPouRRuRRRu)(2002121uuRRuuPPoo)(213421ooouuRpRRRpRRu27VuuRpRRRpRRuooo5~1)(213421Rp=81~41617U2-U1=[R1/R1+R2]*UoH-UoL=1V[R1/R1+R2]*5+5=1VR2=9*R127U1=UR*R2/(R1+R2)+UoL*R1/(R1+R2)=0.4UR*9*R1/(10*R1)-5*R1/(10*R1)=0.4UR=1V36B110S1S2S3S4CUC1=-(UOS2+UO1)K2UO1=-(UC1-UOS1)K110UC1UOS1-UOs2/K1UOS1S1S2S3S4UO1=-UiR2/R1-UOS1K1+UC1K1=-UiR2/R1210K1=K2=KUC1=UOS1*K2/(1+K2)-UOS2*K/(1+K2)UO1=-UiR2/R1-UOS1K1+UC1K1=-UiR2/R1+UOS1*[K3/(1+K2)-K]-UOS2*K2/(1+K2)=-1*50/10+2*10-3*[1012/(1+108)-104]-4*10-3*108/(1+108)=-4.996V(1)10661=arctanR1/R2=302=arvtanR3/R4=60R1/R2=0.57735R3/R4=1.73205R1+R2=R3+R4=80kR1=29.28kR2=29.28kR3=50.72kR4=29.28kR1=27kR2=47kR3=47kR4=27k(2)105+5Uom=5*(R12+R22)1/2/(R1+R2)=3.66V1=arctanR1/R2=29.882=arvtanR3/R4=60.12U2=3.66sin(10t+29.88)U3=3.66sin(10t+60.12)201010H(s)=[Kp*c/(s+c)]*[c2/(s2+2*csin1s+c2)]n=3,2N+1=3N=1k=11=(2-1)/(2*3)=/6sin1=0.5Kp=2.2fc=c=2*1*1000H(s)=[2*c/(s+c)]*[c2/(s2+cs+c2)]=[12566.37/(s+6283)]*[62832//(s2+6283s+62832)]ababbb2018UoUaA1A2U0UaA1A2U0Ua11A121236(U+-0)/R3=[0-(-U1)]/R2U+=(R3/R2)U1U-=-(R3/R2)U1Uo(t)=-[t/(R1+Rw)C]*U1+Uo(0)t=0,Uo(0)=U-=-(R3/R2)U1t=T/2,Uo(T/2)=U+=(R3/R2)U1(R3/R2)U1=(T/2)/[(R1+Rw)C]*U1-(R3/R2)U1T=4*R3*(R1+Rw)*C/R2