HCS410的转发器线圈设计

Thisapplicationnoteexplainsthedesignoftranspon-

dercoils.AnExcelspreadsheetisusedtoautomatethe

updateofvalues,dependingonthespecifiedparame-

ters.Thespreadsheetfilenameistranspnd.xls.Azip

filecontainingthisspreadsheetandacopyofthisappli-

cationnotecanbedownloadedfromMicrochip’sweb

siteatwww.microchip.com.

Thebasicapproachistochoosethetranspondercoil

externaldimensions,sincevolumewillusuallybethe

primaryconstraintforacoilasitwillneedtofitintoa

keyfob,creditcardorothersmallvolume.Secondly,

propertiesofthecore,coilwindingsaswellasthe

equivalentloadplacedacrossthecoilareentered.This

fixestheInitialCoilSpecification.

Oncetheinitialcoilisbuilt,measurementsaremadeon

thiscoiltodeterminethecoilqualityfactor.Thesemea-

surementsareusedtocalculatetheOptimumCoil

Specificationforasecondcoil.AN650DesigningaTransponderCoilfortheHCS410Authors:MikeSonnabend,JanvanNiekerkSPREADSHEETFEATURESMicrochipTechnologyInc.Thespreadsheetissplitintothreeworksheets.Thefirstworksheetconcernstheinitialcoilspecification.TheOVERVIEWinputstothisworksheetarethe:coilexternaldimensionsThisapplicationnoteexplainsthedesignoftranspon-dercoils.AnExcelspreadsheetisusedtoautomatethecoreeffectiverelative