Vim yog cov yam ntxwv hloov pauv ntawm lub zog hloov hluav taws xob, nws yooj yim ua rau lub zog hloov hluav taws xob los tsim cov khoom siv hluav taws xob zoo sib xws. Raws li tus kws tsim khoom siv hluav taws xob, hluav taws xob sib txuas hluav taws xob, lossis PCB layout engineer, koj yuav tsum nkag siab txog cov teeb meem ntawm electromagnetic compatibility teeb meem thiab tau daws cov kev ntsuas, tshwj xeeb tshaj yog layout Engineers yuav tsum paub yuav ua li cas kom tsis txhob nthuav dav ntawm qhov chaw qias neeg. Kab lus no feem ntau qhia txog cov ntsiab lus tseem ceeb ntawm kev tsim hluav taws xob PCB tsim.

1. Ob peb lub hauv paus ntsiab lus: tej hlau muaj impedance; tam sim no ib txwm cia li xaiv txoj hauv kev nrog qhov tsawg tshaj plaws impedance; Kev siv hluav taws xob muaj feem cuam tshuam rau tam sim no, zaus, thiab lub voj voog; hom kev cuam tshuam yog cuam tshuam nrog kev sib nrig sib capacitance ntawm loj dv / dt signals rau hauv av; Lub hauv paus ntsiab lus ntawm kev txo EMI thiab txhim kho kev tiv thaiv kev cuam tshuam muaj peev xwm zoo sib xws.

2. Cov txheej txheem yuav tsum tau muab faib ua raws li cov khoom siv hluav taws xob, analog, kev kub ceev digital thiab txhua qhov kev ua haujlwm thaiv.

3. Txo qhov chaw ntawm qhov loj di / dt voj voog thiab txo qhov ntev (los yog cheeb tsam, dav ntawm cov kab loj dv / dt teeb liab). Qhov kev nce hauv cheeb tsam ib puag ncig yuav ua rau kom muaj kev faib tawm. Txoj hauv kev dav dav yog: kab dav dav Sim ua kom loj li sai tau, tab sis tshem tawm qhov ntau dhau), thiab sim taug kev hauv txoj kab ncaj nraim kom txo tau qhov chaw zais kom txo tau hluav taws xob.

4. Inductive crosstalk feem ntau yog tshwm sim los ntawm qhov loj di / dt voj (lub voj voog kav hlau txais xov), thiab qhov induction siv yog proportional rau kev sib nrig sib inductance, yog li nws yog ib qho tseem ceeb kom txo tau qhov kev sib nrig sib inductance nrog cov teeb liab (txoj kev tseem ceeb yog kom txo tau. lub voj cheeb tsam thiab nce qhov kev ncua deb); Kev sib deev crosstalk feem ntau yog tsim los ntawm cov cim loj dv / dt, thiab qhov kev siv zog induction yog proportional rau kev sib nrig sib capacitance. Tag nrho cov kev sib nrig sib capacitance nrog cov teeb liab no raug txo qis (txoj hauv kev tseem ceeb yog txo qhov kev sib txuas ua haujlwm zoo thiab ua kom qhov kev ncua deb. Qhov kev sib nrig sib capacitance txo qis nrog qhov nce ntawm qhov kev ncua deb) yog qhov tseem ceeb dua.

5. Sim siv lub hauv paus ntsiab lus ntawm lub voj kev tshem tawm kom txo tau qhov chaw ntawm lub voj loj di/dt, raws li pom hauv daim duab 1 (zoo ib yam li twisted khub.
Siv lub hauv paus ntsiab lus ntawm lub voj tshem tawm los txhim kho qhov muaj peev xwm tiv thaiv kev cuam tshuam thiab nce qhov kis tau tus mob):

Daim duab 1, Loop cancellation (freewheeling voj ntawm boost circuit)

6. Kev txo qis ntawm lub voj voog tsis yog tsuas yog txo cov hluav taws xob, tab sis kuj txo cov voj voog inductance, ua rau kev ua haujlwm zoo hauv Circuit Court.

7. Kev txo qis hauv cheeb tsam voj voog xav kom peb tsim kom raug txoj kev rov qab los ntawm txhua txoj kab.

8. Thaum ntau lub PCBs txuas nrog ntawm cov khoom sib txuas, nws tseem yuav tsum tau txiav txim siab txo qis ntawm lub voj voog, tshwj xeeb tshaj yog rau cov teeb liab di / dt loj, cov teeb liab ntau zaus lossis cov teeb liab rhiab heev. Nws yog qhov zoo tshaj plaws uas ib lub teeb liab xaim sib raug rau ib qho av xaim, thiab ob lub xov hlau nyob ze li sai tau. Yog tias tsim nyog, twisted khub xov hlau tuaj yeem siv rau kev sib txuas (qhov ntev ntawm txhua tus twisted khub xaim sib raug rau ntau qhov sib npaug ntawm lub suab nrov ib nrab ntawm lub voj voog). Yog tias koj qhib lub khoos phis tawj, koj tuaj yeem pom tias USB interface nruab nrab ntawm lub motherboard thiab lub vaj huam sib luag pem hauv ntej txuas nrog ib khub twisted, uas qhia tau hais tias qhov tseem ceeb ntawm kev sib tw twisted khub rau kev tiv thaiv kev cuam tshuam thiab txo cov hluav taws xob.

9. Rau cov ntaub ntawv cable, sim npaj cov xov hlau hauv av ntau dua hauv cov xov hlau, thiab ua rau cov xov hlau hauv av sib npaug sib npaug hauv cov kab hluav taws xob, uas tuaj yeem txo qhov chaw voj voog.

10. Txawm hais tias qee qhov kev sib txuas ntawm cov kab sib txuas yog cov teeb liab tsawg, vim tias cov teeb liab tsawg zaus muaj ntau lub suab nrov (los ntawm kev sib txuas thiab hluav taws xob), nws yog ib qho yooj yim rau radiate cov suab nrov yog tias tsis ua haujlwm zoo.

11. Thaum xaim, ua ntej xav txog cov kab tam sim no loj thiab cov kab uas muaj hluav taws xob.

12. Hloov cov khoom siv hluav taws xob feem ntau muaj 4 lub voj voog tam sim no: kev tawm tswv yim, tso tawm, hloov, freewheeling, (Daim duab 2). Ntawm lawv, cov tswv yim thiab tso tawm tam sim no loops yuav luag ncaj qha tam sim no, yuav luag tsis muaj emi yog tsim, tab sis lawv yooj yim cuam tshuam; qhov kev hloov pauv thiab lub voj voog freewheeling tam sim no muaj di / dt loj dua, uas xav tau kev saib xyuas.
Daim duab 2, Lub voj voog tam sim no ntawm Buck circuit

13. Lub rooj vag tsav Circuit Court ntawm mos (igbt) raj feem ntau kuj muaj di/dt loj.

14. Tsis txhob tso cov teeb liab me me, xws li kev tswj hwm thiab analog circuits, nyob rau hauv cov khoom siv hluav taws xob loj, cov khoom siv hluav taws xob thiab cov hluav taws xob siab kom tsis txhob cuam tshuam.

Yuav txuas ntxiv....