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1、IntroductiontoMedium-1andHigh-PowerSwitchingConverters1.1MARKETFORMEDIUM-ANDHIGH-POWERCONVERTERSPowerelectronicconvertershavebeenoneofthefastestgrowingmarketsectorsintheelectronicsindustryoverthelast25yrs.Powerelectronicdevicesareattheheartofmanymodernindustrialandconsumerapp
2、licationsandaccountfor$18billionperyrindirectsales,withanestimated$570billionthroughsalesofotherproductsthatincludepowerelectronicmodules.Themainapplicationareasforpowerelectronicsareinpowerqualityandprotection,switch-modepowerconversion,batteriesandportablepowersources,autom
3、otiveelectronics,solarenergytechnology,communicationspower,andmotioncontrol(classificationsimilartoaDamellmarketreport).ThetechnologybehindtheproductswithinthesemarketsisonthesaturationsideoftheS-curve.Thismeansthatwecannotexpecttoomanynewconcepts.Onthecontrary,theindustry’sef
4、fortsareconcentratedinoptimizationofproductionandcostefficiency.TheOrganizationofElectronicsManufacturers(OEM)hasalreadyshownacleartrendforthepowersupplysectortostayawayfromcustom-designedproductsandtooptimizestandard,modifiedstandard,andmodularconfigurableproducts.Inpowerelectr
5、onics,technologyhasdevelopedunderthepressureoftheindus-try’sneedsandtherearemanyexcellentpaperswrittenbybothindustryanduniver-sitypeers.Itistheintentionofthisbooktounderstandcurrenttechnologywithinabusinessperspectiveandtopresenttheexistingscientificknowledgeinanorganizedmanne
6、r.Thisbookfocusesonmedium-andhigh-powerconvertersandthemainapplicationsatthispowerlevelare:.High-voltageDCtransmissionlines.Locomotives.Shippropulsion.Large-ormedium-sizeduninterruptiblepowersupply(UPS)systems.Motorcontrolfromhorsepowerrangetomulti-MVA.Propulsionofelectricorh
7、ybridvehicles1Copyright©2006Taylor&FrancisGroup,LLC2Power-SwitchingConverters.Servo-drives,robotorweldingmachinesystems.Elevatorsystems.Distributedgenerationforrenewableenergysources.Appliances,airconditioners,refrigerators,microwaveovens,washingmachines.Automobileelectronics
8、,powersteering,powerwindows,doorsorseats.Switchmodepowersupplyforind