Hloov cov khoom siv hluav taws xob EMI cov tswv yim rectification zoo tsom xam
Kev faib tawm thiab cov qauv EMC:
EMC (Electromagnetic Compatibility) yog electromagnetic compatibility, uas suav nrog EMI (electromagnetic harassment) thiab EMS (electromagnetic immunity to harassment).EMC txhais tau tias: lub peev xwm ntawm lub cuab yeej lossis lub cev ua haujlwm kom zoo hauv nws qhov chaw electromagnetic yam tsis muaj qhov cuam tshuam tsis zoo ntawm electromagnetic nuisance. rau txhua yam khoom siv hauv ib puag ncig.EMC tag nrho yog hu ua Electromagnetic Compatibility.EMP txhais tau tias Electromagnetic Pulse.
EMC=EMI + EMS EMI: Electromagnetic cuam tshuam EMS: Electromagnetic Compatibility (Immunity)
EMI tuaj yeem muab faib ua ob ntu: Kev siv hluav taws xob thiab hluav taws xob.
Kev qhia tshwj xeeb tuaj yeem muab faib ua: FCC Tshooj 15J Chav B; CISPR 22 (EN55022, EN61000-3-2, EN61000-3-3) Chav B;
National Standard IT Class (GB9254, GB17625) thiab AV Class (GB13837, GB17625).
FCC xeem zaus nyob rau hauv 450K-30MHz, CISPR 22 xeem zaus nyob rau hauv 150K-30MHz, Kev coj yuav raug kuaj nrog ib tug spectrum analyser, Radiation yuav tsum tau kuaj nyob rau hauv ib tug tshwj xeeb kuaj.
EMI rau electromagnetic cuam tshuam, EMI yog ib feem ntawm EMC, EMI (Electronic Magnetic Interference) electromagnetic cuam, EMI suav nrog conduction, hluav taws xob, tam sim no harmonics, voltage flicker thiab hais txog. Electromagnetic cuam tshuam yog tsim los ntawm peb qhov chaw: qhov cuam tshuam qhov chaw, qhov sib txuas channel thiab cov receiver, feem ntau hu ua peb lub ntsiab ntawm kev cuam tshuam. EMI yog linearly proportional rau tam sim no, tam sim no voj cheeb tsam thiab square ntawm zaus xws li: EMI=K*I*S*F2. Kuv yog qhov tam sim no, S yog qhov chaw voj voog, F yog qhov zaus, thiab K yog qhov tsis tu ncua cuam tshuam nrog cov khoom siv hauv pawg thawj coj saib thiab lwm yam.
Radiated cuam tshuam (30MHz-1GHz) taug kev los ntawm qhov chaw thiab nthuav tawm nrog cov yam ntxwv thiab kev cai ntawm electromagnetic nthwv dej. Txawm li cas los xij, tsis muaj ib qho cuab yeej twg tuaj yeem cuam tshuam cov hluav taws xob hluav taws xob.
Kev cuam tshuam (150K - 30}MHz) yog kev cuam tshuam uas nthuav tawm raws tus neeg xyuas pib. Yog li ntawd, kev nthuav tawm ntawm kev cuam tshuam kev cuam tshuam yuav tsum muaj kev sib txuas ua tiav ntawm qhov cuam tshuam ntawm qhov chaw thiab tus txais.
EMI yog qhov cuam tshuam sab nraud electromagnetic ntawm ib yam khoom. Nws yog feem ntau cais raws li Class A & Class B. Class A yog cov chav kawm ua lag luam thiab Class B yog cov chav kawm ua lag luam. Class A yog chav kawm ua lag luam thiab Class B yog chav kawm pej xeem. Cov chav tsev nyob yog nruj dua li cov chav kawm kev lag luam vim hais tias cov chav kawm ua lag luam tso cai rau me ntsis hluav taws xob ntau dua. Cov khoom siv tib yam hauv kev ntsuas EMI hluav taws xob ntsuas los hais lus, hauv 30-230MHz, Chav B xav kom cov khoom hluav taws xob txwv tsis pub tshaj 40dBm thiab Class A yuav tsum tsis pub tshaj 50dBm (rau peb meters txoj kev ntsuas ntawm cov xov tooj cua hauv chav tsaus ntuj nthwv dej, piv txwv li) yog qhov yooj yim dua, feem ntau hais lus, CLASSA yog hais txog EMI kuaj cov xwm txheej, yam tsis muaj kev cuam tshuam ntawm tus neeg teb xov tooj, cov cuab yeej tuaj yeem cia siab tias yuav ua haujlwm ntxiv mus li qub Lub CLASSA tsis tso cai rau kev ua haujlwm tsis zoo lossis tsis ua haujlwm. qis dua qhov kev ua haujlwm tau teev tseg.
