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1、SwitchingPowerSupplySwitchingpowersupplyisavoltageconversioncircuit,themainworkisthestep-upandstep-down,arewidelyusedinmodernelectronicproducts.Alwaysworkbecausetheswitchingtransistorinthe"on"and"off"state,socalledswitchingpowersupply.Switchingpowersupplyinrealtermsisanoscilla
2、torcircuit,theconversionofelectricalenergynotonlyusedinpowercircuit,thecircuitinotherapplicationsarealsocommon,suchasLCDbacklightcircuits,suchasfluorescentlamps.Switchthesourcecomparedwiththetransformerhighefficiency,goodstability,smallsizeandotheradvantages,disadvantagesisthe
3、relativelysmallpower,andhigh-frequencyinterferenceonthecircuit,circuitcomplexity,suchaseasymaintenance.Talkingaboutswitchingpowersupplybeforeyoufamiliarwiththefeedbackoscillatorcircuittransformer,canproducearegularpulsecurrentorvoltageofthecircuitiscalledoscillationcircuit,tra
4、nsformerfeedbackoscillatorcircuitisabletomeettheseconditionsthecircuit;itinthebasicamplifiercircuitwithafeedbackloopcomposedofC2,L1electiontoformaparallelresonantfrequencycircuit,theinstantaneouspowerinthecircuitturn-VT,thistimeintheC2,L1,composedofparallelresonantcircuitshave
5、averyrichharmonic,whentheplusparallelresonancefrequencyandthenaturalfrequencyofthesamecircuit,thecircuittoenterastateofoscillation,andVTthroughL3feedbacktofurtherenlargethebase,andultimatelytheformationofaregularpulsecurrentorvoltageoutputtotheloadRL.Switchingpowersupplyisarou
6、ndthetransformerandthefeedbackoscillatorcircuitdesign,butthebasisoftheoriginalincreaseinthenumberofprotectionandcontrolcircuits,analysisofouroscillationcircuitcanbeusedtoanalyzethemethodofswitchingpowersupply.SwitchingPowerSupplyvibrationbywayofsub-swingcanbedividedintoself-ex
7、citedanditexcitedthetwo,sincethereisnoneedforplus-excitedself-oscillationsignalsource,sincetheexcitationcanseeitasafeedbackoscillatorcircuittransformer,anditisexcitedistotallydependentontheoutsidetomaintaintheoscillation,inthepracticalapplicationofself-excitationofacomprehensi
8、verangeofapplications.Accordingtothestructureofincentivessign
