Nws yuav tsum yog ib qho ntawm cov teeb meem ntawm kev hloov hluav taws xob hloov hluav taws xob los ua kom muaj kev txawj ntse PCB pawg thawj coj saib (ib qho kev tsim PCB tsis zoo yuav ua rau muaj qhov xwm txheej uas txawm tias qhov ntsuas tsis raug debugged, nws tsis yog tswb). Yog vim li cas tseem muaj ntau yam tseem ceeb uas tau txiav txim siab thaum PCB layout, xws li: hluav taws xob kev ua tau zoo, cov txheej txheem routing, kev ruaj ntseg yuav tsum tau, EMC cuam tshuam, thiab lwm yam. Ntawm cov yam tseem ceeb, hluav taws xob yog qhov yooj yim tshaj plaws, tab sis EMC yog qhov nyuaj tshaj plaws. . , Lub tog raj kheej ntawm kev nce qib ntawm ntau txoj haujlwm nyob hauv qhov teeb meem EMC; cia peb qhia koj txog PCB layout thiab EMC los ntawm 22 cov lus qhia.

Dab tsi EMC teeb meem yuav tsum tau txiav txim siab thaum PCB layout?

1. EMI Circuit Court ntawm PCB tsim tuaj yeem ua tau zoo tom qab paub txog lub voj voog.

Qhov cuam tshuam ntawm Circuit Court saum toj no ntawm EMC tuaj yeem xav txog. Lub lim ntawm qhov kev tawm tswv yim kawg nyob ntawm no; lub siab rhiab heev rau kev tiv thaiv xob laim; qhov tsis kam R102 los tiv thaiv inrush tam sim no (kev koom tes nrog cov relay kom txo qhov poob); Qhov kev xav tseem ceeb yog qhov sib txawv ntawm hom X capacitor thiab lub inductance yog sib txuam nrog Y capacitor rau lim; kuj tseem muaj cov fuses uas cuam tshuam rau kev ruaj ntseg board layout; txhua lub cuab yeej ntawm no yog qhov tseem ceeb heev, thiab koj yuav tsum ua tib zoo mloog lub luag haujlwm thiab lub luag haujlwm ntawm txhua lub cuab yeej. EMC qhov hnyav theem uas yuav tsum tau txiav txim siab thaum tsim lub voj voog yog tsim kom zoo, xws li teeb tsa ntau theem ntawm kev lim dej, tus naj npawb ntawm Y capacitors, thiab qhov chaw. Qhov kev xaiv ntawm varistor loj thiab ntau yog ze rau peb qhov kev thov rau EMC. Zoo siab txais tos txhua tus los tham txog qhov yooj yim EMI Circuit Court, tab sis txhua qhov khoom muaj qhov tseeb tob.

2. Circuit Court thiab EMC: (Qhov feem ntau paub flyback lub ntsiab topology, saib qhov chaw tseem ceeb hauv Circuit Court muaj EMC mechanism).

Muaj ntau qhov chaw hauv Circuit Court hauv daim duab saum toj no: qhov cuam tshuam rau EMC tseem ceeb heev (nco ntsoov tias qhov ntsuab tsis yog), xws li hluav taws xob, txhua tus paub tias hluav taws xob hluav taws xob hluav taws xob hluav taws xob yog spatial, tab sis lub hauv paus ntsiab lus tseem ceeb yog kev hloov pauv. magnetic flux, uas cuam tshuam rau qhov zoo ntawm qhov chaw sib nqus ntawm qhov chaw sib nqus. , Uas yog lub voj sib txuas hauv Circuit Court. Cov hluav taws xob tam sim no tuaj yeem tsim tau ib qho chaw sib nqus, nws ua rau cov hlau nplaum ruaj khov, uas tsis tuaj yeem hloov mus rau hauv hluav taws xob; tab sis qhov hloov pauv tam sim no ua rau muaj qhov hloov pauv ntawm magnetic teb, thiab hloov magnetic teb tuaj yeem tsim hluav taws xob (qhov tseeb, qhov no yog qhov sib npaug Maxwell nto moo, Kuv siv cov lus yooj yim), hloov tib yam, cov hluav taws xob tuaj yeem tsim cov hlau nplaum. teb. Yog li nco ntsoov ua tib zoo saib xyuas cov chaw nrog cov xeev hloov, uas yog ib qho ntawm EMC qhov chaw, ntawm no yog ib qho ntawm EMC qhov chaw (ntawm no, tau kawg, kuv yuav tham txog lwm yam tom qab); Piv txwv li, lub dotted voj nyob rau hauv lub Circuit Court yog lub hloov raj qhib. Thiab lub voj kaw, tsis tsuas yog qhov hloov pauv ceev tuaj yeem hloov kho kom cuam tshuam rau EMC thaum tsim lub voj voog, tab sis kuj yog lub voj voog ntawm lub rooj tsav xwm txheej txheem muaj qhov cuam tshuam tseem ceeb! Lwm ob lub voj yog lub voj nqus thiab lub voj rectification. Kawm txog nws ua ntej thiab tham txog nws tom qab!

3. Kev sib koom ua ke ntawm PCB tsim thiab EMC.

1). Qhov cuam tshuam ntawm PCB voj ntawm EMC yog qhov tseem ceeb heev, xws li flyback lub ntsiab lub zog voj. Yog tias nws loj heev, cov hluav taws xob yuav tsis zoo.

2). Qhov cuam tshuam ntawm cov lim. Cov lim dej yog siv los lim tawm qhov cuam tshuam, tab sis yog tias cov kab hluav taws xob PCB tsis zoo, lub lim yuav poob cov txiaj ntsig nws yuav tsum muaj.

3). Nyob rau hauv cov txheej txheem, tsis zoo grounding ntawm lub radiator tsim yuav cuam tshuam rau grounding ntawm shielded version, thiab lwm yam.

4). Qhov chaw rhiab heev nyob ze rau qhov kev cuam tshuam, xws li EMI Circuit Court thiab lub raj xa hluav taws xob yog ze heev, nws yuav ua rau EMC tsis zoo, thiab yuav tsum muaj thaj chaw sib cais meej.

5). RC nqus Circuit Court routing.

6). Y capacitor yog grounded thiab routed, thiab qhov chaw ntawm Y capacitor kuj tseem ceeb, thiab lwm yam.