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ʻOiai ke kaulana nei nā ʻūhā ʻano maʻamau, ʻo kahi ʻē aʻe he kānana EMI monolithic. Ke waiho pono ʻia, hāʻawi kēia mau ʻāpana ceramic multilayer i ka hōʻole ʻana i ka leo maʻamau.
Nui nā mea e hoʻonui ai i ka nui o ka "noise" interference e hiki ke hōʻino a keʻakeʻa paha i ka hana o nā lako uila. ʻO nā kaʻa o kēia lā he kumu nui. ʻo ia wale nō ka hoʻomaka. No ka mālama ʻana i kēia keakea leo, hoʻohana maʻamau ka ʻoihana i ka pale a me nā kānana EMI e hoʻopau i ka walaʻau makemake ʻole.
Ke alakaʻi nei kēia pilikia i nā OEM he nui e pale aku i ka hoʻohana ʻana i ka ʻokoʻa 2-capacitor, 3-capacitor (hoʻokahi X capacitor a me 2 Y capacitors), nā kānana feedthrough, nā ʻāʻī maʻamau, a i ʻole ka hui pū ʻana o kēia mau mea no kahi hopena kūpono e like me kahi kānana EMI monolithic me ʻoi aku ka maikaʻi o ka hōʻole ʻana i ka walaʻau ma kahi pūʻolo liʻiliʻi.
I ka loaʻa ʻana o nā hawewe electromagnetic ikaika i nā lako uila, hiki ke hoʻoulu ʻia nā au i makemake ʻole ʻia i loko o ke kaapuni a hana i ka hana i manaʻo ʻole ʻia - a keakea paha i ka hana i manaʻo ʻia.
Hiki i ka EMI/RFI ke ʻano o ka hoʻokuʻu ʻia ʻana a i ʻole ka hoʻoheheʻe ʻia. Ke alakaʻi ʻia ʻo EMI, ʻo ia ke ʻano o ka hele ʻana o ka walaʻau ma nā conductors uila.
ʻOiai ka liʻiliʻi o ka ikehu i hoʻohana ʻia mai waho, inā e hui pū me nā hawewe lekiō i hoʻohana ʻia no ka hoʻolaha ʻana a me ke kamaʻilio ʻana, hiki iā ia ke lilo i ka nalowale o ka hoʻokipa ʻana, ka walaʻau ʻino ʻole i ke kani, a i ʻole ke hoʻopau ʻia o ke wikiō. Inā ikaika loa ka ikehu, hiki iā ia ke hōʻino i nā mea uila.
Loaʻa i nā kumu nā walaʻau kūlohelohe (e laʻa, hoʻokuʻu electrostatic, kukui, a me nā kumu ʻē aʻe) a me ka walaʻau i hana ʻia e ke kanaka (e laʻa, ka leo hoʻopili, nā mea hoʻoheheʻe e hoʻohana ana i nā alapine kiʻekiʻe, nā hoʻokuʻu makemake ʻole, a me nā mea ʻē aʻe). , no laila ka hoʻonā e hoʻohana i kahi kānana EMI e wehe i nā alapine kiʻekiʻe i makemake ʻole ʻia, ma ke ʻano he mea ʻokoʻa a i hoʻokomo ʻia i loko o kahi papa kaapuni.
Nā kānana EMI Loaʻa nā kānana EMI i nā ʻāpana passive, e like me nā capacitors a me nā inductors, i hoʻopili ʻia e hana i kahi kaapuni.
"Hāʻawi nā mea hoʻokomo i ka DC a i ʻole ka manawa haʻahaʻa haʻahaʻa e hele i ka wā e kāohi ana i nā au i makemake ʻole ʻia. Hāʻawi nā Capacitors i kahi ala haʻahaʻa haʻahaʻa e hoʻohuli i ka walaʻau kiʻekiʻe mai ka hoʻokomo ʻana o ka kānana i ka mana a i ʻole ka pili ʻāina, "i ʻōlelo ai ʻo Manufactures a Multilayer Ceramic ʻo Christophe Cambrelin o ka hui capacitor Johanson Dielectrics.EMI kānana.
Loaʻa nā ʻano kānana maʻamau maʻamau i nā kānana haʻahaʻa me ka hoʻohana ʻana i nā capacitors e hele i nā hōʻailona me nā alapine ma lalo o kahi alapine ʻoki i koho ʻia a hoʻemi i nā hōʻailona me nā alapine ma luna o ke alapine cutoff.
ʻO kahi hoʻomaka maʻamau ka hoʻopili ʻana i kahi pālua o nā capacitors i kahi hoʻonohonoho ʻokoʻa, me hoʻokahi capacitor ma waena o kēlā me kēia meheu o ka hoʻokomo ʻokoʻa a me ka lepo. e hoʻouna ana i nā hōʻailona o nā ʻāpana kūʻē ma luna o nā uea ʻelua, ua hoʻomaikaʻi ʻia ka ratio hōʻailona-a-noise i ka wā e hoʻouna ʻia ai ka walaʻau makemake ʻole i ka honua.
"Eia naʻe, hiki ke hoʻololi nui ʻia ka waiwai capacitance o nā MLCC me X7R dielectrics (hoʻohana mau ʻia no kēia hana) me ka manawa, ka uila a me ka mahana," wahi a Cambrelin.
"No laila ʻoiai ʻelua mau capacitors e pili pono ana i ka manawa i hāʻawi ʻia i ka lumi lumi ma kahi haʻahaʻa haʻahaʻa, e hoʻopau paha lākou i nā waiwai like ʻole i hoʻokahi manawa, ka hoʻololi ʻana a i ʻole ka wela. ʻO kēia kūlike ʻole ma waena o nā uea ʻelua ʻO ka hoʻohālikelike ʻana e hopena i nā pane like ʻole kokoke i ka ʻoki kānana. No laila, hoʻololi ia i ka walaʻau maʻamau i ka walaʻau ʻokoʻa.
ʻO kekahi hopena ʻē aʻe, ʻo ka hoʻopili ʻana i kahi capacitor "X" nui ma waena o nā capacitors ʻelua "Y". a ʻo kahi mea ʻē aʻe i kahi kānana haʻahaʻa haʻahaʻa, ʻo ia ke ʻano choke maʻamau.
He 1:1 transformer me ka wili ʻelua e hana ana ma ke ʻano kumu mua a me ke kula kiʻekiʻe. Ma kēia ʻano, ʻo ke ʻano ma o ka wili ʻana hoʻokahi e hoʻoulu i kahi au kūʻē i ka wili ʻē aʻe. i ka hāʻule ʻana o ka haʻalulu.
Eia nō naʻe, ʻo ke ʻano ʻokoʻa maʻamau kūpono me ka hoʻohālikelike kūpono a me ka hoʻopili ʻana ma waena o nā wiliwili he akaka i nā hōʻailona ʻokoʻa a he kiʻekiʻe ka impedance i ka noise mode maʻamau. , ʻoi aku ka kiʻekiʻe o ka inductance i hoʻohana ʻia no ka loaʻa ʻana o ka kānana alapine haʻahaʻa, ʻoi aku ka nui o nā huli e koi ʻia, no laila ka hopena i nā capacitances parasitic ʻaʻole hiki ke hele i ka kānana alapine kiʻekiʻe.
ʻO ka likeʻole ma waena o nā makani ma muli o ka hoʻololiʻana i keʻano hana, kahi i hoʻololiʻia ai kahi hapa o ka ikehu hōʻailona i ka walaʻau maʻamau a me ka hope.
ʻAʻole naʻe, ʻoi aku ka maikaʻi o ka hoʻokē ʻai ʻana o ke ʻano maʻamau ma mua o nā koho ʻē aʻe i ka wā e hana ai ka hōʻailona ʻokoʻa (e hele i loko) i ka laina alapine like me ka walaʻau ʻano maʻamau e pono e hōʻole ʻia. hui hōʻole ʻano maʻamau.
Nā kānana EMI Monolithic ʻOiai ua kaulana nā ʻano kīʻaha maʻamau, hiki ke hoʻohana ʻia nā kānana EMI monolithic. Ke waiho pono ʻia, hāʻawi kēia mau ʻāpana ceramic multilayer maikaʻi loa i ka leo leo maʻamau. .Hoʻohana kēia mau kānana i ʻelua ala uila ʻokoʻa i loko o ka mea hoʻokahi i hoʻopili ʻia i ʻehā mau pili waho.
No ka pale ʻana i ka huikau, pono e hoʻomaopopo ʻia ʻaʻole nā ​​kānana monolithic EMI maʻamau i nā capacitors feedthrough. nā kānana, nā kānana EMI monolithic e ho'ēmi i ka ikehu ma luna o ke alapine cutoff i kuhikuhi ʻia a koho e hele wale i ka ikehu hōʻailona makemake, ʻoiai e hoʻohuli i ka leo i makemake ʻole ʻia i "ka honua".
Eia naʻe, ʻo ke kī he haʻahaʻa haʻahaʻa loa a me ka hoʻohālikelike ʻana i ka impedance. Hoʻokumu ʻia e ʻelua ʻāpana capacitive e kaʻana like i kahi electrode kuhikuhi maʻamau, aia nā mea āpau i loko o kahi kino seramika hoʻokahi.
ʻO ke kaulike ma waena o nā ʻaoʻao ʻelua o ka capacitor, ʻo ia hoʻi, ua like nā hopena piezoelectric a kū'ē, e kāpae ana i kēlā me kēia. nā kānana, ʻaʻole ia e hana inā like ka leo maʻamau me ka hōʻailona ʻokoʻa.
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