HCS410设计的基站线圈
ThisapplicationnotedescribestheExcelspreadsheet
todesignbasestationcoils.Thespreadsheetfile
nameisbasesta.xls.Azipfilecontainingthisspread-
sheetandacopyofthisapplicationnotecanbedown-
loadedfromMicrochip’swebsiteat
www.microchip.com.
Thebasicapproachusedistochoosethedrivercir-
cuitdrivingvoltageandcurrent.Thesetwovaluesare
usedtocalculatethetotalresistancethattheseries
resistor-inductor-capacitor(RLC)circuitshouldhave.
Secondly,theresonatingcapacitorratedvoltageis
chosen.Thecoilinductanceandresonatingcapacitor
valuecanthenbecalculated.
Foragivencoilinductanceandcoilresistance,choos-
ingthecoilaveragediameterandcoilwindingaspect
ratiodeterminesthecoildimensions,numberofturns
andwirediameter.
Themagneticfieldstrengthcanbecalculatedatany
givendistancegiventhecoilaveragediameter,number
ofturnsandcoilcurrent.AN677DesigningaBaseStationCoilfortheHCS410Author:MikeSonnabend,JanvanNiekerkINTRODUCTIONMicrochipTechnologyInc.OverviewofInductiveCommunicationCommunicationbetweenaKEELOQtransponderandabasestationoccursviamagneticcouplingbetweenOVERVIEWthetranspondercoilandbasestationcoil.ThebasestationcoilformspartofaseriesRL
