RFI imatanthawuza mphamvu yamagetsi yosafunikira mumtundu wa ma frequency angapo ikapangidwa mukulankhulana kwa wailesi.Mafupipafupi osiyanasiyana a conduction chodabwitsa amachokera ku 10kHz mpaka 30MHz;ma frequency osiyanasiyana a radiation phenomenon ali pakati pa 30MHz ndi 1GHz.
Pali zifukwa ziwiri zomwe RFI iyenera kuganiziridwa: (1) Zogulitsa zawo ziyenera kugwira ntchito moyenera m'malo omwe amagwira ntchito, koma malo ogwira ntchito nthawi zambiri amatsagana ndi RFI yoopsa.(2) Zogulitsa zawo sizingawongolere RFI kuti zitsimikizire kuti sizikusokoneza kulumikizana kwa RF komwe kuli kofunikira ku thanzi ndi chitetezo.Lamuloli lakhazikitsa njira zolumikizirana zodalirika za RF kuti zitsimikizire kuti RFI ikuwongolera zida zamagetsi.
RFI imafalitsidwa ndi ma radiation (mafunde amagetsi mu malo aulere) ndikufalikira kudzera mu mzere wa siginecha ndi makina amagetsi a AC.
Radiation - imodzi mwazinthu zofunika kwambiri za RFI radiation kuchokera ku zida zamagetsi ndi chingwe chamagetsi cha AC.Chifukwa kutalika kwa chingwe chamagetsi cha AC kumafika pa 1/4 ya kutalika kofananira kwa zida za digito ndi magetsi osinthira, izi zimakhala mlongoti wogwira mtima.
Kuyendetsa - RFI imachitika m'njira ziwiri pamagetsi amagetsi a AC.Filimu wamba (asymmetric) RFI imapezeka m'njira ziwiri: pamtunda (LG) ndi nthaka yopanda ndale (NG), pamene njira yosiyana (symmetric) RFI ikuwonekera pamzere wosalowerera ndale (LN) mu mawonekedwe a magetsi.
Ndi chitukuko chofulumira cha dziko masiku ano, mphamvu zamagetsi zowonjezereka zowonjezereka zimapangidwira.Panthawi imodzimodziyo, mphamvu yamagetsi yowonjezereka yowonjezereka imagwiritsidwa ntchito pofalitsa ndi kukonza deta, kotero kuti imatulutsa chikoka komanso ngakhale kusokoneza phokoso kumawononga zipangizo zamagetsi.Fyuluta yosokoneza magetsi ndi imodzi mwa njira zosefera zomwe zimagwiritsidwa ntchito poyang'anira RFI kuchokera ku chipangizo chamagetsi kuti alowe (kulephera kugwira ntchito kwa zipangizo) ndi kutuluka (kusokoneza komwe kungatheke ku machitidwe ena kapena kulankhulana kwa RF).Powongolera RFI mu pulagi yamagetsi, fyuluta yamagetsi imalepheretsanso kwambiri ma radiation a RFI.
Zosefera za mzere wamagetsi ndi gawo la network network passive, lomwe limakonzedwa muzosefera zapawiri.Netiweki imodzi imagwiritsidwa ntchito kutsitsa wamba, ndipo inayo ndi yochepetsera kusiyana.Netiweki imapereka mphamvu ya RF mu "stop band" (nthawi zambiri yopitilira 10kHz) ya fyuluta, pomwe yapano (50-60Hz) siyimachepetsedwa.
Monga ma netiweki okhazikika komanso apawiri, fyuluta yosokoneza mzere wamagetsi imakhala ndi zovuta zosinthira, zomwe zimatengera gwero ndi kulepheretsa katundu.Mawonekedwe ocheperako a fyuluta amawonetsedwa ndi kufunikira kwa mawonekedwe otembenuka.Komabe, m'malo opangira magetsi, magwero ndi kutsekeka kwa katundu sikudziwika.Chifukwa chake, pali njira yokhazikika yotsimikizira kusinthasintha kwa fyuluta mumakampani: kuyeza mulingo wochepetsera ndi 50 ohm resistive source ndi kutha kwa katundu.Mtengo woyezedwa umatanthauzidwa ngati kutayika koyika (IL) kwa fyuluta:
Ine..L.= 10 chipika * (P(l)(Ref)/P(l))
Apa P (L) (Ref) ndi mphamvu yotembenuzidwa kuchokera ku gwero kupita ku katundu (popanda fyuluta);
P (L) ndi mphamvu yotembenuza pambuyo poyika fyuluta pakati pa gwero ndi katundu.
Kutayika koyikirako kungasonyezedwenso mu voteji kapena chiŵerengero chamakono:
IL = chipika 20 *(V(l)(Ref)/V(l)) IL = chipika 20 *(I(l)(Ref)/I(l))
Apa V (L) (Ref) ndi I (L) (Ref) ndi miyeso yopanda fyuluta,
V (L) ndi I (L) ndi milingo yoyezedwa ndi fyuluta.
Kutayika koyika, komwe kuli koyenera kuzindikira, sikuyimira ntchito yochepetsera ya RFI yoperekedwa ndi fyuluta mu chilengedwe cha mzere wamagetsi.M'malo a chingwe chamagetsi, mtengo wachibale wa gwero ndi kulepheretsa katundu kuyenera kuyerekezedwa, ndipo mawonekedwe oyenera osefa amasankhidwa kuti apangitse kusagwirizana kwakukulu komwe kungatheke pa terminal iliyonse.Zosefera zimatengera magwiridwe antchito a terminal impedance, yomwe ili maziko a lingaliro la "mismatch network".
Mayeso a conduction amafunikira malo abata a RF - chipolopolo cha chishango - netiweki yokhazikika ya mzere, ndi chida chamagetsi cha RF (monga cholandila FM kapena spectrum analyzer).Malo a RF pamayeso akuyenera kukhala osachepera 20dB kuti apeze zotsatira zolondola.Linear impedance stabilization network (LISN) ndiyofunikira kukhazikitsa gwero lomwe limafunikira kuti lilowetse chingwe chamagetsi, chomwe ndi gawo lofunika kwambiri la pulogalamu yoyeserera chifukwa cholepheretsacho chimakhudza mwachindunji mulingo wa radiation.Kuphatikiza apo, kuyeza koyenera kwa burodibandi kwa wolandila ndi gawo lofunikira pakuyesa.
Nthawi yotumiza: Mar-30-2021
