EasyManua.ls Logo

Curtis Instruments 1232 - APPENDIX B: EMC & ESD DESIGN CONSIDERATIONS; Electromagnetic Compatibility (EMC)

Curtis Instruments 1232
133 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Loading...
#URTIS-ANUAL/3
"
!00%.$)8"
6%()#,%$%3)'.#/.3)$%2!4)/.3
2%'!2$).'%,%#42/-!'.%4)##/-0!4)"),)49%-#
!.$%,%#42/34!4)#$)3#(!2'%%3$
%,%#42/-!'.%4)##/-0!4)"),)49%-#
%LECTROMAGNETICCOMPATIBILITY%-#ENCOMPASSESTWOAREASEMISSIONSAND
IMMUNITY%MISSIONSARERADIOFREQUENCY2&ENERGYGENERATEDBYAPRODUCT
4HISENERGYHASTHEPOTENTIALTOINTERFEREWITHCOMMUNICATIONSSYSTEMSSUCH
ASRADIOTELEVISIONCELLULARPHONESDISPATCHINGAIRCRAFTETC)MMUNITYISTHE
ABILITYOFAPRODUCTTOOPERATENORMALLYINTHEPRESENCEOF2&ENERGY
%-#ISULTIMATELYASYSTEMDESIGNISSUE0ARTOFTHE%-#PERFORMANCE
ISDESIGNEDINTOORINHERENTINEACHCOMPONENTANOTHERPARTISDESIGNEDINTO
ORINHERENTINENDPRODUCTCHARACTERISTICSSUCHASSHIELDINGWIRINGANDLAYOUT
ANDlNALLYAPORTIONISAFUNCTIONOFTHEINTERACTIONSBETWEENALLTHESEPARTS
4HE DESIGN TECHNIQUES PRESENTED BELOW CAN ENHANCE %-# PERFORMANCE IN
PRODUCTSTHATUSE#URTISMOTORCONTROLLERS
%MISSIONS
3IGNALSWITHHIGHFREQUENCYCONTENTCANPRODUCESIGNIlCANTEMISSIONSIFCON
NECTED
TOA
LARGEENOUGHRADIATINGAREACREATEDBYLONGWIRESSPACEDFARAPART
#ONTACTOR DRIVERS AND THE MOTOR DRIVE OUTPUT FROM #URTIS CONTROLLERS CAN
CONTRIBUTETO2&EMISSIONS"OTHTYPESOFOUTPUTAREPULSEWIDTHMODULATED
SQUAREWAVESWITHFASTRISEANDFALLTIMESTHATARERICHINHARMONICS.OTE
CONTACTOR DRIVERS THAT ARENOT MODULATEDWILL NOT CONTRIBUTE TO EMISSIONS
4HEIMPACTOFTHESESWITCHINGWAVEFORMSCANBEMINIMIZEDBYMAKINGTHE
WIRESFROMTHECONTROLLERTOTHECONTACTORORMOTORASSHORTASPOSSIBLEANDBY
PLACINGTHEWIRESNEAREACHOTHERBUNDLECONTACTORWIRESWITH#OIL2ETURN
BUNDLEMOTORWIRESSEPARATELY
&ORAPPLICATIONSREQUIRINGVERYLOWEMISSIONSTHESOLUTIONMAYINVOLVE
ENCLOSINGTHECONTROLLERINTERCONNECTWIRESCONTACTORSANDMOTORTOGETHERIN
ONESHIELDEDBOX%MISSIONSCANALSOCOUPLETOBATTERYSUPPLYLEADSANDTHROTTLE
CIRCUITWIRESOUTSIDETHEBOXSOFERRITEBEADSNEARTHECONTROLLERMAYALSOBE
REQUIREDONTHESEUNSHIELDEDWIRESINSOMEAPPLICATIONS)TISBESTTOKEEPTHE
NOISYSIGNALSASFARASPOSSIBLEFROMSENSITIVEWIRES
)MMUNITY
)MMUNITYTORADIATEDELECTRIClELDSCANBEIMPROVEDEITHERBYREDUCINGOVERALL
CIRCUITSENSITIVITYORBYKEEPINGUNDESIREDSIGNALSAWAYFROMTHISCIRCUITRY4HE
CONTROLLERCIRCUITRYITSELFCANNOTBEMADELESSSENSITIVESINCEITMUSTACCURATELY
DETECTANDPROCESSLOWLEVELSIGNALSFROMSENSORSSUCHASTHETHROTTLEPOTENTI
OMETER4HUSIMMUNITYISGENERALLYACHIEVEDBYPREVENTINGTHEEXTERNAL2&
ENERGYFROMCOUPLINGINTOSENSITIVECIRCUITRY4HIS2&ENERGYCANGETINTOTHE
CONTROLLERCIRCUITRYVIACONDUCTEDPATHSANDRADIATEDPATHS
!00%.$)8"%-#%3$$%3)'.#/.3)$%2!4)/.3

Table of Contents

Related product manuals