Nekuda kwekuchinja hunhu kweiyo switching magetsi emagetsi, zviri nyore kukonzeresa yekuchinja magetsi kuburitsa yakakura electromagnetic kupindirana kukanganisa. Seinjiniya yemagetsi, injinjiniya inoenderana nemagetsi, kana PCB yekumisikidza mainjiniya, unofanirwa kunzwisisa zvinokonzeresa matambudziko ekuenderana kwemagetsi uye wagadzirisa matanho, kunyanya marongero Mainjiniya anofanirwa kuziva nzira yekudzivirira kuwedzera kwenzvimbo dzakasviba. Ichi chinyorwa chinonyanya kusuma mapoinzi makuru emagetsi ekugadzira PCB dhizaini.

15. Deredza iyo inobata (sensitive) yechiratidzo loop nzvimbo uye urefu hwe wiring kuderedza kupindira.

16. Madiki echiratidzo chechiratidzo chiri kure nemitsara yakakura yedv / dt (yakadai seC pole kana D danda rekushandura chubhu, buffer (snubber) uye network network) kuderedza kubatanidza, uye pasi (kana magetsi, muchidimbu) Chiratidzo chinogoneka) kuti uwedzere kudzikisira kubatana, uye pasi panofanirwa kunge pakabatana zvakanaka nendege yepasi. Panguva imwecheteyo, mitsetse midiki yechiratidzo inofanirwa kunge iri kure sezvinobvira kubva kune yakakura di/dt mitsetse yechiratidzo kudzivirira inductive crosstalk. Zviri nani kusaenda pasi peiyo hombe dv/dt chiratidzo kana diki chiratidzo chinotevera. Kana kuseri kweiyo diki chiratidzo chechiratidzo ichigona kudzikwa (iyo ivhu rimwe chete), chiratidzo cheruzha chakabatanidzwa nacho chinogonawo kudzikiswa.

17. Zviri nani kuisa pasi kumativi uye kumashure kweiyi huru dv / dt uye di / dt chiratidzo chekutsvaga (kusanganisira C / D matanda emagetsi ekushandura uye switch tube radiator), uye shandisa kumusoro uye pasi. zvidimbu zvevhu Via hole connection, uye batanidza iyi pasi kune imwe nzvimbo yakajairika (kazhinji E/S danda re switch chubhu, kana sampling resistor) ine yakaderera impedance trace. Izvi zvinogona kuderedza radiated EMI. Izvo zvinofanirwa kucherechedzwa kuti iyo diki chiratidzo pasi haifanirwe kunge yakabatana neiyi nhovo pasi, zvikasadaro ichaunza kupindira kukuru. Mahombe dv/dt anoteedzera anowanzo kupindirana kune radiator uye ivhu riri padyo kuburikidza nemutual capacitance. Zvakanakisa kubatanidza switch chubhu radiator kune inodzivirira pasi. Iko kushandiswa kwepamusoro-gomo switching madivayiri kuchaderedzawo kuwirirana capacitance, nekudaro kuderedza kubatana.

18. Zvakanakisisa kusashandisa vias nokuda kwezvironda zviri nyore kuvhiringidza, sezvo zvichakanganisa zvose akaturikidzana kuti via inopfuura.

19. Kudzivirira kunogona kuderedza EMI yakasvibiswa, asi nekuda kwekuwedzera kukwanisa kusvika pasi, inoitwa EMI (common mode, kana extrinsic differential mode) ichawedzera, asi chero bedzi iyo shielding layer yakanyatsogadziriswa, haizowedzera zvakanyanya. Inogona kutariswa mukugadzirwa chaiko.

20. Kuti udzivise kupindira kwakafanana, shandisa imwe nheyo yepasi uye magetsi kubva pane imwe nzvimbo.

21. Kushandura magetsi emagetsi kunowanzova nezvikonzero zvitatu: simba rekupinza rakakwirira ikozvino pasi, simba rekubuda rakakwirira ikozvino pasi, uye diki chiratidzo chekutonga pasi. Nzira yekubatanidza pasi inoratidzwa mumufananidzo unotevera:

22. Pakuisa pasi, tanga watonga mamiriro epasi usati wabatanidza. Ivhu resampling uye kukanganisa kukwidziridzwa kunofanirwa kuwanzobatanidzwa kune yakashata danda reinobuda capacitor, uye chiratidzo chesampling chinowanzo kutorwa kubva kune yakanaka danda reinobuda capacitor. Iyo diki chiratidzo chekudzora pasi uye dhiraivha pasi inofanirwa kuwanzobatanidzwa kune E / S danda kana sampling resistor ye switch chubhu zvichiteerana kudzivirira Common impedance kupindira. Kazhinji nzvimbo yekudzora uye dhiraivha yeIC haina kutungamirwa kunze zvakasiyana. Panguva ino, iyo inotungamira impedance kubva kune sampling resistor kune iyo iri pamusoro pevhu inofanirwa kunge iri diki sezvinobvira kudzikisa yakajairika impedance kupindira uye kugadzirisa iko kurongeka kwesampling yazvino.

23. Iyo yakabuda voltage sampling network yakanakisa kuve padyo nemhosho amplifier pane kuburitsa. Izvi zvinodaro nekuti yakaderera impedance masaini haanyanyike kukanganiswa pane yakakwira impedance masaini. Iwo sampling traces anofanirwa kunge ari padyo sezvinobvira kune mumwe nemumwe kuderedza ruzha rwakatorwa.

24. Nyatsoteerera kurongeka kwema inductors kuti ave kure uye perpendicular kune mumwe nemumwe kuderedza mutual inductance, kunyanya kuchengetedza simba inductors uye filter inductors.

25. Ngwarira kurongeka apo iyo yepamusoro-frequency capacitor uye yakaderera-frequency capacitor inoshandiswa zvakafanana, iyo yepamusoro-frequency capacitor iri pedyo nemushandisi.

26. Low-frequency interference is a common differential mode (pazasi pe1M), uye high-frequency interference is common mode, kazhinji inosanganiswa nemwaranzi.

27. Kana iyo yepamusoro-frequency chiratidzo ichibatanidzwa kune inopinza inotungamira, zviri nyore kuumba EMI (common mode). Iwe unogona kuisa magineti mhete pane yekupinza lead padyo nemagetsi. Kana iyo EMI ikaderedzwa, inoratidza dambudziko iri. Mhinduro yedambudziko iri ndeyekudzikisa kubatanidza kana kuderedza EMI yedunhu. Kana iyo yepamusoro-frequency ruzha isina kusefa yakachena uye ichiitwa kune yekupinza inotungamira, EMI (musiyano modhi) ichaumbwa zvakare. Panguva ino, magnetic ring haigoni kugadzirisa dambudziko racho. Tambo mbiri dzakakwirira-frequency inductors (symmetrical) apo inopinza inotungamira iri pedyo nemagetsi. Kuderera kunoratidza kuti dambudziko iri ririko. Mhinduro yedambudziko iri ndeyekuvandudza kusefa, kana kuderedza chizvarwa chepamusoro-frequency ruzha nebuffering, clamping nedzimwe nzira.

28. Kuyera kwekusiyanisa maitiro uye yakajairika mode ikozvino:

29. Isefa yeEMI inofanira kunge iri pedyo nemutsara unouya sezvinobvira, uye wiring yemutsara unouya inofanira kuva pfupi sezvinobvira kuderedza kubatanidza pakati pekutanga uye kumashure kweEMI filter. Iyo inopinda waya inodzivirirwa zvakanyanya neiyo chassis pasi (iyo nzira inotsanangurwa pamusoro apa). Iyo inobuda EMI sefa inofanirwa kubatwa zvakafanana. Edza kuwedzera chinhambwe pakati pemutsara unouya uye yakakwira dv/dt chiratidzo chekutsvaga, uye funga nezvayo muhurongwa.