第七章辅助电路和监控电路设计

7.17.21.7-17-1PWMUinCRPWMUVLOPWMPWM7-1D2IC12~18VPWMPWMCPWMUC382533mA10mAmA50mA10msUC3825400mV10msPWMR50mA10ms=500C400mVC=500C/400mV1.25mF(1250F)!UinRD1VccPWMCD27-1PWM7-2PNPT1D3MOSFET(T2)T2MOSFETPNPD312VMOSFET2V12V+2V14V14V-9V(UVLO)5V5V/0.4V=12.51250F100F100F1250FUinD1R1T1UccCD2D3PWMR2R3T27-2PWMR1,5210k28V15V14V7.0142828ln≈−=τdts7.1t=700msmWP171010)1528(32=×−=78mW1/8W7-3MOSFET7-3T1R2R3UaUaDz115VUa15VC1Dz2PWMPWMNaD1C1T2Dz215VT1R1R1T1R1,R2M7-3400V100V7-1PFC7-2(7-3)R7.3-R7R1T1TOPSWICHMIPUinF0.1A/250VR1R2T1R3R4C3R9UoD1Dz2D2R7R5R8DLDz1C1T2C2NaR67-3T1-STW5NA90;T2-BC547;DZ1-BZV85C24;Dz2-BZX79C24;D1-1N4007;D2–UG1B;DL-LED.C3-100NnF;C1-120/63V;C2-1F/63VR1-680/7W;R2-2M2MRS252;R3-1k;R4-10;R5-10k;R6-2k2;R7-1/MRS25;R8-2k2;R9-180k2.PWMTOPSWITCHMIP3524,UC384253A7-454V/30APFCTT220V20%20V41N1005C122.5VIC1781515V0.2AC1=500µµµR1R2PRR3DVzIC2B5.3VR35mAPR147V147VIC2BVTC4IC2A147VIC2BVTR5C4IC2A14VC4UC4IC115VR7=R6=10k,R8=47,Vcc=15VUo1=14V125.8475145)547(247157//687//67//6887671=+×++×=+×++×+×=+RRRRRURRRRRRVRUoccVTC422µFR5150kU+57.2)125.81515ln(150.022)ln(=−××=−=+UVVtccccτs2.5PFCPFCDC/DCPFCDC/DCBoostPFCBoostIC2AOPB.PWM100A54~56V5kW380V220V513V20%650V7-5547-5Ui380VDC/DC7-5IC1AIC1BIC2UC3844Q112V-12V5V12V15V12UC38441mA16V10V6VR1=110k,C1220µF10ms10V120mAUC384417mA100mAMOSFETDz125V,PWM30VUi513VPWM5mAD12VD4PWMUC38441comp,PWMIC1AIC1B20%UC3844C53n3R9(5.6k)(100kHz)1µsR111.8k,R12(470)12V2.5V,125.2)1(121112=×+=+RRUoVUC384400.8VR18=470.7V0.48D=0.3933.8mH3C85ETD29,Sc=0.76cm2,Sw=1.34cm265108.3339.010115133611=××××==−−LDTUIipmA6.61090108.332)39.0513(2)(33212=×××××==−fLDUPioW55N1:N21:N22530:20:20:20B0545.01076.0530101139.05134611=×××××=××=××=∆−−SNDTUSNTUBioniT80%oioiUUUUNNnminmin21)224.1~63.1(96.0)4.0~3.0(5.0===C.P3N100.3A/1000V.d.IC26,13.5V.,.131053C857.3RCcompPWM494NPNPWMICPWMICPWMICPWMIC7.4PWMICVhVccR1R3TrR4DVR5PWMICR2VrDA7.4561M,PWMIC7.41PWMICR1R2,DVDVPWMICDV2.5,,PWMIC,,.DV.,.R5.220V0.7=154,PFC218PWMIC.DV2.5,5.2212=+=iURRRUV,2.8612.8715.2218121=−=−=−=UURRi1M,TL4312A,2A.R1=510k3R2=1530/86.2=17.8k.18k.152V,218V218/1.53M=142A2A.2201.3=286V,404V,W036.0510000/)3/404(/22===RUP1/8W0.036W1%.,,10%,152V0.9=136.8V,193V.R5R2UiminR1R5Ur=5VU2R27.5244.2193153018182122=×+=+=iURRRUVR1,U22.44V,R1.PWMIC5V,,R5,193V,U22.5V,7.5133256.09.118244.25.2)6.05.25(25==−−−=RRkR5=133k.1/20W.R3TL431IqTrUbe.Iqmax=1A,Ube=0.4V,40014.03==qbeIURkR3=200k.57R4PWMICTr.2.5V,TL431,,64.21008.8301005.27.01230min4=×=−−=−−oakbeccIUUURβkR4=2.4k.PWMICUcc=12V;TL431Uak=2.5V,Ube=0.7V;PWMICIo=100mA.DU2A,A.,..,UC3845.7.5APFCAPFCDC/DCAPFCBoostAPFCAPFCDC/DCAPFCDC/DCAPFC310VAPFCDC/DCAPFCDC/DC+5VTTL12VTTL+5V2.5V12V6V12VPMOSFETMOSFETTTL12V7.6PWM15823500V7.6T1BJTBJTMOSFETE-BT25V1:5T225VBJTmA25V2LUoT1T27.67.759PWMPWM7.7PWM()7.81PWM2PWMPWMPWMTTL7.8R1R2R1R1RCTTL7.71.57.7PWM7.8TTLPWMR2R3R17.8PWM7.107.117.9.17.9.25%PWM5%1%0.5%5%601%5%UC35255.1V1%1%,UC2525UC15252%2%3%,2%10000.5%3.5%1%1%4.5%2%235%,REF0160dB100010V10V10V/1000=10mV0~10mV12V10.4V10.4V11V11V11.5V12V10.4V11.5VUhUh=11-10.4=0.6V7.9(a)7.10(a)7.7)()1(max2121oriURRURRU±−+=UomaxUh=2max21oURR.Ur=0Ud=rURR21Ud11+10.4)/2=10.7V)(max211212oriURRRURRRU±+++=61Uomax7.9(b)7.10(b)+VccUo+VccUrUoUomaxUiUoUiUiUr-Vcc-Uomax-VccR2UdR2Uh(a)(b)(a)(b)7.97.10R1R1110V1.35110=149V,10V0.82110=90V10V7.11LM393-393OCR3R1,R4R5UR5V393B393A393COMPWM393AUR=5V393BD3UR55418.295149RRRRUURi++===R5=10kR4+R1=29.810-10=288k0.05W393BD5UIUccR1R2D1R3-R4+D2393A393BR5R7R6D3UR7.11DDRoURRRUUU++−=+677)(139V393B664.48.291398.29===∆−ioUUV921.0677=+RRRR7=15kR6=1.3k393A90V393A905108.2954min=×+=RRUUiR62R4=6.5k,R1=298-10-6.5=282k393A5VR20338.05.610528251005412=+−−=+−−=+RRURUUIRRimA1280338.065.0522=−=−=IUURDRkR1=282kR2=128kR4=6.5k,R5=10kR6=1kR7=12kR3=2kOC5A50mV20nHL/R=20nH/10m2sC=t/R=27.1350~100mVEMI7.14R41212iURRRU+=+Ui1Ui2Ui1=0,7.127.1363234ioURRU−=−R1Ui1R2Ui2R3R47.14Ui20,1212343411ioURRRRRURRU+⎟⎟⎠⎞⎜⎜⎝⎛+=⎟⎟⎠⎞⎜⎜⎝⎛+=++R4/R3=R2/R1,1341212343411iioURRURRRRRURRU=+⎟⎟⎠⎞⎜⎜⎝⎛+=⎟⎟⎠⎞⎜⎜⎝⎛+=++)(2134134234iiiioooUURRURRURRUUU−=+−=+=+−R4/R3R2/R1,5V1%,50mV0.1%1%1k2nFUn10k+UI-1k10k7.157.15264