Iwo echinyakare debugging maturusi e PCB inosanganisira: time domain oscilloscope, TDR (time domain reflectometry) oscilloscope, logic analyzer, uye frequency domain spectrum analyzer nemimwe michina, asi izvi zvinoreva hazvigone kuratidza kuratidzwa kweiyo yakazara ruzivo rwePCB data data. Iri bepa rinosvitsa nzira yekuwana izere nemagetsi magetsi ePCB neEMSCAN system, uye inotsanangura mashandisiro eruzivo urwu kubatsira dhizaini uye kugadzirisa dambudziko.

EMSCAN inopa spectrum uye nzvimbo yekuongorora mabasa. Mhedzisiro yeiyo spectrum scan inogona kutipa pfungwa yakajairika yeiyo spectrum inogadzirwa neEUT: mangani mafirita ezvinhu aripo, uye chii chiri chiyero chekufungidzira kwechikamu chimwe nechimwe chefrivit. Mhedzisiro yespatial scanning ndeyemepu yeinopopu nemuvara unomiririra amplitude yeiyo frequency point. Tinogona kuona inesimba yemagetsi kugovera munda kweimwe frequency frequency inogadzirwa nePCB munguva chaiyo.

Iyo “yekuvhiringidza sosi” inogona zvakare kuwanikwa nekushandisa masystem analyzer uye imwechete padyo-munda probe. Pano shandisa nzira ye “moto” kuita dimikira, unogona kuenzanisa iyo iri kure munda bvunzo (EMC standard bvunzo) ku “kuona moto”, kana paine frequency point inodarika muganho, inoonekwa se “yawanikwa moto “. Iyo yechinyakare “Spectrum analyzer + single probe” scheme inowanzo shandiswa nema EMI mainjiniya kuti vaone kuti chikamu chei chekisesi murazvo uri kupukunyuka kubva. Kana rimi rikaonekwa, kudzvanywa kweEMI kunowanzoitwa nekudzivirira uye kusefa kuvhara rimi mukati mechigadzirwa. EMSCAN inotibvumidza kuti tione kunobva kukanganiswa, “kubatidza”, pamwe ne “moto,” inova nzira yekuparadzira yekukanganisa. Kana EMSCAN ichishandiswa kutarisa dambudziko reEMI yesisitimu yese, iyo yekutsvagisa kubva kumurazvo kuenda kumurazvo inowanzo gamuchirwa. Semuenzaniso, tanga watarisa chassis kana tambo kuti uone kuti iko kupindira kunobva kupi, wobva watarisa mukati meichi chigadzirwa, icho PCB chiri kukonzeresa kupindirana, wobva watarisa chishandiso kana wiring.

Iyo yakajairika nzira iri seinotevera:

(1) Kurumidza kutsvaga magetsi ekukanganisa magetsi. Tarisa tarisiro yekuparadzaniswa kweiyo inokosha wave uye uwane nzvimbo chaiyo neakakura kwazvo pakaparadzaniswa kwepakati peiyo yekutanga wave. Nekuvhiringidzwa kwebandaneti, taura frequency iri pakati pekukanganiswa kwebandband (se60MhZ-80mhz Broadband kupindirana, tinogona kudoma 70MHz), tarisa kugoverwa kwenzvimbo kweiyi frequency point, tsvaga iyo chaiyo nzvimbo ine yakakura amplitude.

(2) Taura nzvimbo uye ona mepu yechimiro yenzvimbo. Tarisa uone kuti ukuru hwenzvimbo imwe neimwe yehoniconi panzvimbo iyoyo zvinoenderana nerevhuru yakazara. Kana yakaputirwa, zvinoreva kuti nzvimbo yakatarwa ndiyo nzvimbo yakasimba kwazvo yekuburitsa kusagadzikana uku. Nekuvhiringidzwa kwebandaneti, tarisa kana chinzvimbo ichi chiri chinzvimbo chakanyanya chekupindirana kwese kwerebandband.

(3) Muzviitiko zvakawanda, haazi ese maamoni anogadzirwa panzvimbo imwechete, dzimwe nguva kunyangwe ma harmoniki uye asinganzwisisike maumboni anogadzirwa munzvimbo dzakasiyana, kana chimwe nechimwe chikamu chinogadzirwa chinogona kugadzirwa munzvimbo dzakasiyana. Mune ino kesi, iwe unogona kuwana iwo akasimba mwaranzi nekutarisa kune yekuparadzaniswa kwenzvimbo kwenzvimbo dzehuwandu hwehuwandu hwaunofarira.

(4) Hapana mubvunzo kuti inoshanda zvakanyanya kugadzirisa matambudziko eEMI / EMC nekutora matanho munzvimbo ine radiation yakasimba.

Iyi nzira yekutsvaga EMI, iyo inogona kunyatsoteedzera iyo “sosi” uye nzira yekuparadzira, inogonesa mainjiniya kugadzirisa matambudziko EMI nemutengo wakaderera uye nekukurumidza. Panyaya yemudziyo wekutaurirana, uko mwaranzi yaibuda netambo yefoni, zvakave pachena kuti kuwedzera dziviriro kana kusefa kune tambo kwaisakwanisika, zvichisiya mainjiniya vasina chavanoita. Mushure mekunge EMSCAN yashandiswa kuita iko kwekutevera kumusoro uye kuongorora, mamwe maYuan mashoma akashandiswa pabhodhi re processor uye mamwe akati wandei mafirita capacitors akaiswa, izvo zvakagadzirisa dambudziko reEMI iro mainjiniya vaisakwanisa kugadzirisa kare. Kukurumidza kutsvaga dunhu kukanganisa nzvimbo Mufananidzo 5: Spectrum dhizaini yeyakajairwa bhodhi uye kukanganisa bhodhi.

Sezvo kuoma kwePCB kunowedzera, kuoma uye kuwanda kwebasa rekugadzirisa kunowedzerawo. Iine oscilloscope kana logic analyzer, imwe chete kana shoma nhamba yemitsara yemasaini inogona kucherechedzwa panguva, nepo mazuva ano panogona kunge paine zviuru zvemitsara yemasaini paPCB, uye mainjiniya vanofanira kuvimba neruzivo kana rombo rakanaka kuti vawane dambudziko. Kana isu tiine “izere nemagetsi ruzivo” rweyakajairika bhodhi uye rakakanganisika bhodhi, tinogona kuwana zvisina kujairika frequency spectrum nekuenzanisa iwo maviri data, tobva tashandisa “chipingaidzo sosi yekutsvaga tekinoroji” kuti uwane nzvimbo yeasina kujairika frequency chakasarudzika, uyezve tinogona kukurumidza kuwana nzvimbo uye chikonzero chemhosho. Zvino, iyo nzvimbo ye “isina kujairika masekondi” yakawanikwa pamepu yekuparadzira mepu yekanganiso ndiro, sezvakaratidzwa muFIG. 6. Nenzira iyi, nzvimbo yekukanganisa yaive kune gridhi (7.6mm × 7.6mm), uye dambudziko rinogona kukurumidza kuongororwa. Mufananidzo 6: Tsvaga nzvimbo ye “isina kujairika masekondi” pamepu yekuparadzira mepu yepasiti ndiro.

Ichi chinyorwa pfupiso

Pcb yakazara yakazara yemagetsi ruzivo, inogona kuti isu tive nekunzwisisa kwakanyanya kwePCB yese, kwete chete kubatsira mainjiniya kugadzirisa EMI / EMC matambudziko, asi zvakare batsira mainjiniya kugadzirisa PCB, uye kugara uchivandudza dhizaini yePCB. EMSCAN zvakare ine akawanda mashandisirwo, akadai sekubatsira mainjiniya kugadzirisa matambudziko emagetsi ekunzwa magetsi.