Yuav ua li cas EMI tsim los hloov cov khoom siv hluav taws xob
Kev faib tawm thiab cov qauv EMC:
EMC (Electromagnetic CompaTIbility) yog Electromagnetic Compatibility, uas suav nrog EMI (Electromagnetic Molestation) thiab EMS (Electromagnetic Molestation Susceptibility).EMC txhais tau tias yog lub peev xwm ntawm lub cuab yeej lossis lub kaw lus ua haujlwm zoo hauv nws qhov chaw electromagnetic yam tsis ua rau muaj kev cuam tshuam tsis zoo ntawm electromagnetic cuam tshuam rau txhua yam. ntawm txhua yam khoom siv hauv ib puag ncig.EMC raug xa mus rau tag nrho raws li EMP yog Electromagnetic Pulse.
EMC=EMI + EMS EMI: Electromagnetic cuam tshuam EMS: Electromagnetic Compatibility (Immunity)
EMI tuaj yeem muab faib ua Kev Coj Ua Haujlwm thiab Radiated Radiation.
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 los ntawm spectrum analyzer, Radiation yuav tsum tau kuaj nyob rau hauv 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 cuam tshuam qhov chaw, qhov txuas txuas txuas thiab lub receiver, feem ntau hu ua peb lub ntsiab lus 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. Feem ntau, nws raug cais raws li Chav Kawm 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. Class A yog siv rau kev lag luam thiab Class B yog siv rau hauv tsev. Kev siv nyob hauv tsev yog nruj dua li kev siv hauv kev lag luam vim tias kev siv ua lag luam tso cai rau cov hluav taws xob ntau dua me ntsis. 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 cov hluav taws xob txwv tsis pub tshaj 50dBm (peb-meter txoj kev ntawm Kev ntsuas hauv chav tsaus ntuj ua piv txwv) yog qhov yooj yim dua, feem ntau hais lus, CLASSA hais txog EMI kev sim ntsuas yam tsis tas yuav tsum muaj tus neeg teb xov tooj cuam tshuam, cov cuab yeej tuaj yeem ua haujlwm txuas ntxiv raws li qhov xav tau, thiab tsis tso cai rau kev ua haujlwm hauv qab no. qhia qib. 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.
EMI yog cov hluav taws xob thiab kev ua haujlwm ntawm cov cuab yeej ntsuas thaum lub sijhawm ua haujlwm ib txwm muaj. Nyob rau hauv qhov kev xeem, EMI hluav taws xob thiab conduction nyob rau hauv lub receiver muaj ob lub sab sauv txwv, feem, sawv cev ntawm Class A thiab Class B, yog hais tias tus pom waveform tshaj kab ntawm B tab sis qis dua kab A, ces cov khoom yog ib chav kawm ntawv. A. EMS yog siv cov cuab yeej ntsuas los cuam tshuam cov khoom, saib xyuas cov khoom hauv kev cuam tshuam hauv kev ua haujlwm ib txwm muaj, yog tias kev ua haujlwm ib txwm muaj lossis tsis tshwm sim ntau tshaj qhov kev ua haujlwm tsis zoo ntawm cov qauv kev cai, rau chav kawm A. EMS yog siv cov cuab yeej ntsuas los cuam tshuam nrog cov khoom los saib seb cov khoom puas tuaj yeem ua haujlwm ib txwm muaj cuam tshuam. Yog tias cov khoom ua haujlwm ib txwm ua lossis tsis qhia qhov kev ua haujlwm degradation tshaj tus qauv, nws yog chav A. Yog tias cov khoom tuaj yeem rov pib dua thiab tsis pom qhov kev ua haujlwm degradation tshaj tus qauv tom qab rov pib dua, nws yog chav B. Yog tias nws tsis tuaj yeem rov pib dua thiab xav tau. kom rov pib dua los ntawm tib neeg, nws yog qib C. Yog tias nws dais, nws yog qib D. Lub teb chaws tus qauv muaj kev qhia ntawm qib D, EN tsuas yog A, B, C. EMI yog qhov phem tshaj ntawm khib ntau ntawm kev khiav hauj lwm zaus .
