I. Kakaretso
Lintlha tse tharo tsa tšitiso ea motlakase ke mohloli oa tšitiso, tsela ea phetisetso ea tšitiso, moamoheli oa tšitiso, EMC mabapi le litaba tsena bakeng sa lipatlisiso.Mekhoa ea mantlha ea khatello ea ho kena-kenana ke ho sireletsa, ho sefa, ho beha fatše.Li sebelisoa haholo-holo ho khaola tsela ea phetisetso ea tšitiso.
Kajeno re bua ka ho sefa EMC, tokiso ea EMC mekhoeng e sebelisoang hangata ea ho sefa e na le mekhoa e fapaneng, tse latelang re tla ipapisa le mefuta ena ea mekhoa ea ho sefa, tlhahlobo ea litaba tse hlokang tlhokomelo ts'ebetsong ea ts'ebeliso.
II.Sesefa sa makenete
Sefa sa makenete ke ka ho kenya likarolo tsa makenete potolohong, ho thibela ho ata ha lerata le ho bonahatsoa ha maqhubu a phahameng, ka hona ho fokotsa tšitiso ea motlakase.Likarolo tse tloaelehileng tsa makenete li kenyelletsa mehele ea makenete, li-bar magnets, li-coil, joalo-joalo.
1Ka hona, ha u khetha filthara ea makenete, hoa hlokahala hore u tsebe hore na u batla mofuta ofe oa khatello ebe u khetha filthara e nepahetseng.
(2) Mofuta oa sefe: Mefuta e fapaneng ea lihloela tsa makenete e sebetsa ka tsela e fapaneng bakeng sa mefuta e fapaneng ea mehloli ea tšitiso.Ka mohlala, li-filters tsa magnetic loop hangata li loketse mehloli ea lerata le phahameng, ha li-coil filters li loketse mehloli ea lerata le tlaase.Ka hona, ha u khetha sefahla sa makenete, litšoaneleho tsa mohloli oa tšitiso le litšobotsi tsa sefahla li hloka ho nahanoa.
(3) Sebaka sa ho kenya: Li-filters tsa Magnetic li hloka ho kenngoa pakeng tsa mohloli oa tšitiso le lisebelisoa tse amehang e le hore li sefise tšitiso ka katleho.Leha ho le joalo, hoa hlokahala ho qoba ho beha filthara ea makenete sebakeng sa mocheso o phahameng kapa tikoloho e sisinyehang ho netefatsa ho ts'epahala le botsitso ba eona.
(4) Khokahano ea fatše: Khokahano ea fatše e na le phello ea bohlokoa ho katleho ea li-filters tsa makenete.Ho hokahanya terata ea lefatše ka nepo ho ka ntlafatsa ts'ebetso ea sefa, ho ntlafatsa phello ea khatello le ho fokotsa tšitiso ea motlakase.
III.Sesefa sa capacitive
Capacitive Filter: Ka ho hlahisa likarolo tsa capacitive potolohong, maqhubu a maqhubu a phahameng a tataisoa fatše ho fokotsa mahlaseli le ho ata ha tšitiso ea motlakase.
(1) Mefuta ea li-capacitor: Ho na le mefuta e fapaneng ea li-capacitor, tse kang tantalum electrolytic capacitors, aluminium electrolytic capacitors le ceramic capacitors.Mefuta e fapaneng ea li-capacitor e na le ts'ebetso e fapaneng bakeng sa mefuta e fapaneng ea maqhubu, kahoo o hloka ho khetha capacitor e nepahetseng ho latela maemo a itseng.
(2) Maqhubu a maqhubu: Litšobotsi tsa khafetsa tsa li-filter tsa capacitive li fokotsa sekhahla sa tšitiso eo li ka e hatellang ka nepo.Ka hona, ha u khetha li-filters tsa capacitive, hoa hlokahala ho tseba hore na ho hlokahala mofuta ofe oa khatello ea khatello ebe u khetha filthara e nepahetseng.
(3) Khetho ea boleng ba capacitance: Boleng ba capacitance ea capacitor bo ama ka ho toba phello ea eona ea ho hloekisa, e kholoanyane ea boleng ba matla, e ntlafatsa phello ea ho hloekisa.Empa u se ke ua khetha capacitance e kholo haholo, e le hore u se ke ua ba le tšusumetso e mpe mosebetsing o tloaelehileng oa potoloho.
(4) Litšobotsi tsa mocheso: bokhoni ba capacitor bo tla fetoha ka phetoho ea mocheso.Sebakeng sa mocheso o phahameng, bokhoni ba capacitor bo tla fokotseha, kahoo bo ama phello ea eona ea ho sefa.Ka hona, ha u khetha li-capacitor, ho hlokahala hore u nahane ka litšobotsi tsa bona tsa mocheso le ho khetha li-capacitor tse nang le botsitso bo botle ba mocheso.
IV.Sesefa sa impedance
Sefahla sa Impedance: Ka ho hlahisa likarolo tsa impedance potolohong, potoloho e na le tšitiso e phahameng ho lets'oao la maqhubu a itseng, ka hona ho fokotsa kapa ho felisa tšitiso le lerata.Likarolo tse tloaelehileng tsa impedance li kenyelletsa li-inductors, li-transformer, jj.
(1) Maqhubu a maqhubu: Litšobotsi tsa khafetsa tsa li-filters tsa impedance li fokotsa mefuta e mengata ea litšitiso tseo li ka li hatellang hantle.Ka hona, ha u khetha filthara ea impedance, hoa hlokahala hore u tsebe hore na u batla mofuta ofe oa khatello ebe u khetha filthara e nepahetseng.
(2) Mofuta oa impedance: Mefuta e fapaneng ea impedance e na le litšoantšiso tse fapaneng bakeng sa mefuta e fapaneng ea mehloli ea tšitiso.Ka mohlala, li-inductors li loketse mehloli ea lerata le phahameng, ha li-transformer li loketse mehloli ea lerata le tlaase.Ka hona, ha u khetha li-filters tsa impedance, hoa hlokahala ho etsa khetho ea linomoro tse nepahetseng ho latela litšobotsi tsa mohloli oa tšitiso le litšobotsi tsa sefahla.
(3) Ho bapisa ha impedance: Phello ea li-filters tsa impedance e angoa ke ho bapisa ha impedance.Haeba impedance e sa lumellane, phello ea filthara e tla fokotseha haholo.Ka hona, ha ho etsoa le ho kenya li-filters tsa impedance, hoa hlokahala ho etsa bonnete ba hore impedance e lumellana le hore ho sebelisoa likhokahano tse loketseng.
(4) Sebaka sa ho kenya: Li-filters tsa impedance li hloka ho kenngoa pakeng tsa mohloli oa tšitiso le lisebelisoa tse amehang e le hore li sefise tšitiso ka katleho.Leha ho le joalo, hoa hlokahala ho qoba ho beha filthara ea impedance sebakeng sa mocheso o phahameng kapa tikoloho e phahameng ea vibrate ho netefatsa ho ts'epahala le botsitso ba eona.
(5) Khokahano ea Ground: Khokahano e lekaneng ea fatše ke senotlolo sa ho netefatsa ts'ebetso ea li-filters tsa impedance.Ho hokahanya terata ea lefatše ka nepo ho ka ntlafatsa ts'ebetso ea filthara ea impedance, ho ntlafatsa phello ea khatello le ho fokotsa tšitiso ea motlakase.
V. Band Pass Filtering
Ho sefa li-band-pass ho lumella mats'oao a mofuta o itseng oa maqhubu hore a fete ha a ntse a hatella matshwao a maqhubu a mang.
(1) Maqhubu a setsi: Maqhubu a bohareng ba filthara ea li-band-pass ke maqhubu a lets'oao le lokelang ho fetisoa, ka hona hoa hlokahala ho khetha maqhubu a bohareng a loketseng.
(2) Bandwidth: Bophahamo ba sekhahla sa sefahla sa bandpass se hlalosa lebelo la maqhubu a lets'oao le lokelang ho fetisoa, ka hona hoa hlokahala ho khetha sekhahla se loketseng.
(3) Passband le Stopband: Passband ea filthara ea bandpass e hlalosa lebelo la maqhubu a lets'oao le fetang, ha "stopband" e hlalosa sebaka sa maqhubu a lets'oao le hatelitsoeng.Ha u khetha filthara, ho hlokahala hore u khethe li-passband tse nepahetseng le mefuta ea li-stopband ho latela litlhoko tsa kopo.
(4) Mofuta oa ho hloekisa: Ho na le mefuta e sa tšoaneng ea lihlopha tsa li-bandpass, tse kang li-filters tsa bobeli, li-filters tsa Butterworth, li-filters tsa Chebyshev, joalo-joalo Mefuta e sa tšoaneng ea lihlopha e na le litšobotsi tse fapaneng.Mefuta e fapaneng ea li-filters e na le ts'ebetso e fapaneng, ka hona hoa hlokahala ho khetha mofuta o nepahetseng oa sefe ho latela maemo a ts'ebeliso.
(5) Karabelo ea khafetsa: Karabelo ea khafetsa ea filthara ea bandpass e na le tšusumetso ea bohlokoa ts'ebetsong ea eona.E le ho netefatsa boleng ba phetisetso ea lets'oao, hoa hlokahala ho netefatsa hore karabelo ea khafetsa e bataletse ka hohle kamoo ho ka khonehang mme ha ho na ntho e sa rateheng ea resonance moralong.
(6) Botsitso: Li-filters tsa li-band-pass li hloka ho boloka ts'ebetso e tsitsitseng, ka hona hoa hlokahala ho khetha likarolo tsa boleng bo holimo le sebopeho se nepahetseng sa potoloho ho netefatsa botsitso ba maqhubu a ho tšela zero le amplitude.
(7) Phapang ea mocheso: Ts'ebetso ea li-filters tsa li-band-pass li tla hoholeha ka lebaka la liphetoho tsa mocheso o tikolohong.
VI.Kakaretso
Ho sefa ke e 'ngoe ea mekhoa e tloaelehileng eo re e sebelisang ho rarolla mathata a EMC.Ho rarolla mathata a EMC hantle, re hloka ho utloisisa bothata ka botlalo, ho etsa meralo, ho kenya tšebetsong mananeo, ho netefatsa phello, ho ntlafatsa le ho matlafatsa taolo ka ho tsoelang pele.Ke ka tsela ena feela re ka rarollang mathata a EMC ka katleho le ho ntlafatsa ts'ebetso ea EMC ea sistimi.
Zhejiang NeoDen Technology Co., LTD., E thehiloe ka 2010, ke moetsi ea hloahloa ea khethehileng ka mochini oa ho khetha le ho beha sebaka sa SMT, onto ea reflow, mochini oa khatiso oa stencil, mohala oa tlhahiso ea SMT le Lihlahisoa tse ling tsa SMT.Re na le sehlopha sa rona sa R&D le feme ea rona, re nka monyetla ka R&D ea rona e ruileng e nang le boiphihlelo, tlhahiso e koetlisitsoeng hantle, e hapileng botumo bo botle ho tsoa ho bareki ba lefats'e ka bophara.
Re lumela hore batho ba baholo le balekane ba etsa NeoDen k'hamphani e ntle haholo le hore boitlamo ba rona ho Boqapi, Phapano le Tšireletseho bo netefatsa hore othomathike ea SMT e fumaneha ho motho e mong le e mong ea ratang ho itlosa bolutu hohle.
Nako ea poso: Aug-09-2023