高頻變壓器磁飽和電流測試方法研究.pdf

1、河北科技大學碩士學位論文高頻變壓器磁飽和電流測試方法研究姓名：彭愛麗申請學位級別：碩士專業(yè)：測試計量技術及儀器指導教師：馬洪濤20081201AbstractAbstractSwitchmodepowersupply(SMPS)hasadvantagesofhigheonvertefficiencysamllsize，highcontrolprecisionwhichiswidelyappliedinthefieldofconsumab

2、leelectronicproducLcommunicationelectricityenenryresource，aviationmilitaryetcIteffectstheperformanceandvolumeoftheelectronicequipmentHigllfrequencytransformeristhemaincomponentsofswitchmodepowersupplyInpractice，switchmod

3、epowersupplyoftenbedamagedbecauseofthedesignofK曲fiequencytransformerunreasonableorpoormanufacturingtechnologyHi曲frequencytransformerfailurecausedbymagneticsaturationisanimportantreasonWhenthemagneticsaturationwashappened

4、，LpdecreasedsignificantlyTheDCresistanceofprimarysideandthepowerofinternalswitchpowerconsumptionincreaserapidlythenleadingtoasharpincreasecurrentatprimarysideItispossiblethatpowerransistofwasdamagedtalreadybuttheilimitck

5、cuitwhichwithinthecurrentwastoolatetoprotectEventually，hi曲frequencytransformersbecameveryhotchipoverheatingWhentheloadincreasedrapidly，theoutputvoltagedropedandthepowerwaslessthanthedesignoutputpowerAsisknownthatatransfo

6、rmerconsistsofacoreandawindingAsthecoreofBHcurveofthenonlinearwhenthemagneticinductionBincreasestoacertaindegree，itdoesn’tchangewithHapproximatelinearlyButtendstostabilize，resultingincoresaturationInthispapertherelations

7、hipofcurrentandotherparameters，transformersinmagneticsaturationwasanalysisedbasedOnelectricandmagnetictheoryTheconclusionsthatthroughtheaboveanalysisare“inanidealstate，thesizeofmagneticsaturationcurrentonlydepensonthetur

8、nsofthewindingLpandthefrequency，voltage，dutycycle，andotherparametershasnothingtodoWhentests，agreatervoltageamplitudecorrespondsagreaterfrequencyThatis，whenthecoresaturationtheratioofvoltageamplitudeand臺equencywiltendtoac

9、onstantThenonthebasisoftheanalysisofthecore，whichcommonlyusedathi曲丘equencyswitchmodepowersupplytransformerproposingapilotprogrammewhichusingalow丘equencylowvoltageandlli曲curreminsteadtheworkingconditionofhighfrequencyandh