数控开关电源外文翻译.doc

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1、powersupplycookbookMartyBrown1．TheRoleofthePowerSupplywithintheSystemandDesignProgramThepowersupplyassumesaveryuniquerolewithinatypicalsystem.Inmanyrespects,itisthemotherofthesystem.Itgivesthesystemlifebyprovidingconsistentandrepeatablepowertoitscircuits.Itdefendsthesystemagainsttheha

2、rshworldoutsidetheconfinesoftheenclosureandprotectsitswardsbynotlettingthemdoharmtothemselves.Ifthesupplyexperiencesafailurewithinitself,itmustfailgracefullyandnotallowthefailuretoreachthesystem.Alas,mothersaretakenforgranted,andtheirimportantfunctionsarenotappreciated.Thepowersystemi

3、sroutinelyleftuntillateinthedesignprogramfortwomainreasons.First,nobodywantstotouchitbecauseeverybodywantstodesignmoreexcitingcircuitsandrarelydoengineershaveabackgroundinpowersystems.Secondly,benchsuppliesprovideallthenecessarypowerduringthesystemdebuggingstageanditisnotuntiltheprodu

4、ctisattheintegrationstagethatonesays“Oops,weforgottodesignthepowersupply!”Alltoofrequently,thedesignerassignedtothepowersupplyhasverylittleexperienceinpowersupplydesignandhasverylittletimetolearnbeforetheproductisscheduledtoenterproduction.Thistypeofsituationcanleadtothe“millstoneeffe

5、ct”whichinsimpletermsmeans“Youdesignedit,youfixit(forever).”Nowondernoonewantstotouchitand,whenasked,disavowsanyknowledgeofhavingeverdesignedapowersupply.1.1GettingStarted.ThisJourneyStartswiththeFirstQuestionInordertoproduceagooddesign,manyquestionsmustbeaskedpriortothebeginningofthe

6、designprocess.Theearliertheyareaskedthebetteroffyouare.Thesequestionsalsoavoidmanyproblemslaterinthedesignprogramduetolackofcommunicationandforethought.Thebasicquestionstobeaskedincludethefollowing.Fromthemarketingdepartment1.Fromwhatpowersourcemustthesystemdrawitspower?Therearediffer

7、entdesignapproachesforeachpowersystemandonecanalsogetinformationastowhatadverseoperatingconditionsareexperiencedforeach.2.Whatsafetyandradiofrequencyinterferenceandelectromagneticinterference(RFI/EMI)regulationsmustthesystemmeettobeabletobesoldintothetargetmarket?Thiswouldaffectnotonl

8、ythee