EMC, EMI tsim cov lus qhia txog kev hloov pauv hluav taws xob EMI tsim
Cov tswv yim kho kom zoo rau EMI thiab lwm yam, tag nrho ntawm 99 qhov kev paub, Kuv vam tias nws tuaj yeem pab koj.
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 ib txwm nyob hauv nws qhov chaw electromagnetic thiab tsis ua rau muaj kev cuam tshuam tsis zoo ntawm electromagnetic cuam tshuam rau txhua yam hauv ib puag ncig ntawm ib qho khoom siv. EMC yog tag nrho ntawm kev xaiv ntawm electromagnetic compatibility. EMP yog Electromagnetic Pulse.
EMC=EMI + EMS EMI: Electromagnetic cuam tshuam EMS: Electromagnetic Compatibility (Immunity)
EMI tuaj yeem muab faib ua ob ntu: Kev Coj Ua Haujlwm thiab Radiated RadiaTion.
Cov 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. Lub teb chaws tus qauv IT chav kawm (GB9255) tuaj yeem muab faib ua ob ntu;
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 los ntawm spectrum analyzer, Radiation yuav tsum tau kuaj nyob rau hauv ib tug tshwj xeeb kuaj.
EMI yog Electromagnetic cuam tshuam, EMI yog ib feem ntawm EMC, EMI (Electronic Magnetic Interference) Electromagnetic Interference, EMI suav nrog conduction, hluav taws xob, tam sim no harmonics, voltage flicker thiab lwm yam. Electromagnetic cuam tshuam yog tsim los ntawm peb qhov chaw: qhov chaw, qhov sib txuas channel thiab lub receiver, feem ntau hu ua peb lub ntsiab ntawm kev cuam tshuam. EMI yog linearly proportional rau tam sim no, lub voj tam sim no, thiab lub square ntawm qhov zaus, piv txwv 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 categorized rau hauv ob chav kawm, Chav A & Chav B. Chav A yog chav ua lag luam, Chav B yog chav ua lag luam, thiab Chav B yog chav 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. Tib yam khoom hauv qhov ntsuas EMI hluav taws xob ntsuas, hauv 30-230MHz, Chav B xav kom cov hluav taws xob txwv tsis pub dhau 40dBm thiab Class A xav kom tsis pub dhau 50dBm (rau peb-meter txoj kev ntawm Kev ntsuas hauv chav tsaus) yog qhov yooj yim dua, feem ntau hais lus, CLASSA yog hais txog EMI kuaj cov xwm txheej, tsis muaj kev cuam tshuam los ntawm tus neeg teb xov tooj, cov cuab yeej tuaj yeem cia siab tias yuav ua haujlwm txuas ntxiv kom zoo, thiab tsis tso cai rau kev ua haujlwm qis dua qib tau teev tseg. Feem ntau, CLASSA txhais tau hais tias nyob rau hauv EMI kev sim ntsuas, yam tsis muaj kev cuam tshuam tus neeg teb xov tooj, cov khoom siv yuav txuas ntxiv ua haujlwm raws li qhov xav tau, tsis muaj kev puas tsuaj lossis poob ntawm kev ua haujlwm hauv qab qhov kev ua haujlwm tau teev tseg.
