一种pwm型220V高频开关电源的实现方案

2000,5(6):8689JournalofChinaAgriculturalUniversityPWM220V():20000327,17()105,100083,Buck,PWMPWM;;TM133ASchemeMakingPWMHigh-frequencySwitchingPowerSupplyof220VWangKuHuangZanwu(CollegeofElectronicandElectricPowerEngineering,CAU)AbstractThebasictheoryofswitchingpowersupplywasintroduced.TheBuckconverterhasbeenanalyzedandtested.Themodelofthesystemwasestablishedonthebasisofexperiments.Thestabilityofthesystemwasalsoanalyzed.AfeasibleschemeofPWMhighfrequencyswitchingpowersupplywasputforward.KeywordsPWM;switchingpowersupply;systemmodel,,,,,;,,,,,,,,N+1,,,,1111[1]:,©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,,,112BuckPWMTs,PWMT1,T2,T1+T2=1Tr,$iL1=t10VS-VoLdt=VS-VoLT1TS(1)Tr,$iL2=t2t1VoLdt=VoLT2TS(2)(1)(2),Vo=VST1(3)(3),(3),M=VoVS=T1(4)1(4)T1Buck,1,SSH11N90,MOSFET,,S1S4PWMUC3825,UC3825PWM2VoVkVk,Vo,VkVo,Excel2,,Vo=281766Vk-181953,(4),,,786:PWM220V©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.2211[2],,,PWM,,,,2:,,,;,,,,PWMUC3825,,PWM,,,2123PI,[3],,,UC3825,PWM,,PI,3Vr,Vf,VeVf,N,RfC,Ve=RfR1(Vr-Vf)-1R1CVfdt+R3R1(R2+R3)CVrdt(5):RfR1(Vr-Vf);R3R1(R2+R3)CVrdt-1R1CVfdt34K1,Kf3(5)(4)Vo=VeK1,Vf=VoKf(5)G(S)=Rf(R2+R3)CS+R3R1(R2+R3)CSõK11+K1KfRfCS+1R1CS-1(6)882000©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.G(S)=RfK1R1+RfK1KfõS+R3Rf(R2+R3)CS+K1Kf(R1+RfK1Kf)C-1(7):-R3Rf(R2+R3)C,:-K1Kf(R1+RfK1Kf)C,:RfK1R1+RfK1Kf5MATLAB,5,80LsPWM100kHz,2Ls,,,40,,PI4Buck,,,,PIPWM220V1,..:,1998.1626,61712,,..,1999(1):25283.:[].:,2000986:PWM220V©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.