第二章拓扑实际选择

2.114()PWMgoodidea110/2.12.2BuckBoostBuck24V15VBuck24V8V80V(MILSTD704ABuckBuck8V15VBoost100101102103V2.1400V48VBuck2.32.3.1720%30%30%40%20%30%BfNAU∆=UNABfBUβαηmTBfP=(1)fBmBmu,iUcIcttnitrvtdvtdiT2.2Buck)](2)(2[1dvdiccrvriccsttIUttIUTP+++=)(2drccttfIU+=rvrirttt+=dvdidttt+=sccsftIUP=sccsftIUP5.0=80.5PWMIC0.850.05MOSFET250kHz4µs0.1MOSFET0.4µsMOSFET0.1µs0.1µsIC0.10.80.50.4510:1,1:102.41BuckBuck5V5V3.3VIC2.5EMI500VBuck,Boost2.6EMIEMIEMIEMIBuckBoostBoost2.7BJTMOSFETIGBT?BJTMOSFETIGBT1.5kV1kVmAAMOSFET1kV500V,AAIGBT500VkVAkA90%MOSFETMOSFETMOSFET380V1500VMOSFET1000VBJTIGBTIGBTMOSFET500VMOSFETkHzIGBT500VA30kHz20kHz100V9ab2.3.aIGBTMOSFETbBJTMOSFETIGBTBJTMOSFETBJTIGBT2.3(b)U(BR)CBO/70ABJT50V/60AMOSFET380V510V3kWMOSFETBJTMOSFETBJTBJTMOSFETBJTMOSFETm50kHzMOSFETIGBTMOSFETMOSFETIGBTPWMMOSFETIGBTIGBTIGBTIGBTMOSFETMOSFETMOSFETIGBTIGBTIGBT50kHz3kW2.8()ILminLDTUIoL2)1(min−≥TDTon/TTon2.9MOSFETICMOSFET+UU(a)(b)2.4(a)(b)MOSFETMOSFETMOSFET2.4b10MOSFET2.102.111.BuckBuck/Boost.2.53.1,4.5.EMIBuck6.BJT500VIGBTMOSFET7.88.9.2.12Buck2.5,Uin=15V44220F2.5Bucka.BuckBuck1.Buck2.Buck3.Buck5V3.3V4.BuckEMI11BuckNMOSFET5V,10V1V5VPMOSFETPMOSFETRDSN20VPMOSFETNMOSFETBuckNMOSFETUoUin2.6Buck15V2.7Buck2.612V6V90%MOSFET2.7ICMOSFET55550%4N48HCPL2601dV/dtb.2.82.9Ui+UiUoU02.8(Boost)2.9·BoostBuck/BoostBoost12Buck/Boost2.10,5V10A0.550W0.5014)20(212==rmsIA50W500W50W50W,3~4c.2.102.11Buck-BoostBuck2.52.10Buck/BoostUiUo2.11Buck/Boost13BuckBuckBoostBuck–BoostBuckBoostBuckBoostMOSFETPWMICICBuck-Boostd.(2.12)MppUUo2.12LmI2/2RC500WMOSFETMOSFETMOSFETe.2.132.1414IC2.1318050%2.14T1T2·2UiT1D1D2UiUi120V170V2170V340V500VRDson200V2.14D1T1UoUiT2D22.13T1UoUiT22.14Buck/Boostf.90PWMPWM15EMIEMI100W/in3,EMIUUo2.152.15MOSFETMOSFETLCMOSFET100F,50V500kHzmW632/500)50(1002=××=kHzVpFPPWMICICg.PFCC/DCBuck160V1.16Buck50V5V5VBuck()2.131/1020dBDBuck300V10:15V50%2.16Buck-PWM161117