PCB tsim

Hauv txhua qhov kev hloov pauv hluav taws xob tsim, lub cev tsim ntawm PCB pawg thawj coj saib yog qhov kawg txuas. Yog tias txoj kev tsim qauv tsis raug, PCB yuav ua rau hluav taws xob cuam tshuam ntau heev, ua rau lub zog ua haujlwm tsis ruaj khov. Cov hauv qab no yog kev tshuaj xyuas ntawm cov teeb meem xav tau los ua tib zoo saib hauv txhua kauj ruam.

Los ntawm daim duab qhia chaw rau txheej txheem PCB tsim

Set up component parameters – > Cov tswv yim ntsiab lus netlist -> Tsim kev teeb tsa teeb tsa -> Phau ntawv txheej txheem -> Kev tuav kab ntawv -> Txheeb xyuas tus qauv -> Ntsuam xyuas – & gt; CAM cov zis.

Chaw Parameter

Qhov sib nrug ntawm cov xov nyob ib sab yuav tsum ua tau raws li qhov xav tau ntawm kev nyab xeeb hluav taws xob, thiab kom yooj yim ntawm kev ua haujlwm thiab kev tsim khoom, qhov sib nrug yuav tsum yog dav li ntau tau. The minimum spacing should be suitable for the voltage at least. When the wiring density is low, the spacing of signal lines can be appropriately increased. For the signal lines with high and low level disparity, the spacing should be as short as possible and the spacing should be increased.

Qhov nrug nruab nrab ntawm ntug ntawm lub puab sab hauv ntawm lub ncoo thiab ntug ntawm daim ntawv luam tawm yuav tsum ntau dua 1 hli kom tsis txhob muaj qhov tsis xws luag ntawm lub ncoo thaum ua haujlwm. Thaum cov xaim txuas nrog lub ncoo yog qhov nyias nyias, qhov sib txuas nruab nrab ntawm lub ncoo thiab cov xaim tau tsim los ua cov dej me me. Qhov kom zoo dua yog lub ncoo tsis yooj yim rau tev, tab sis xaim thiab lub ncoo tsis yooj yim rau kev sib txuas.

Component layout

Practice has proved that even if the circuit schematic design is correct and the printed circuit board design is improper, the reliability of electronic equipment will be adversely affected.

For example, if two thin parallel lines of a printed board are close together, there will be a delay in the signal waveform, resulting in reflected noise at the end of the transmission line. Kev cuam tshuam los ntawm lub hwj chim thiab cov xaim hauv av yuav ua rau kev ua haujlwm tsis zoo ntawm cov khoom. Yog li ntawd, thaum tsim cov phiaj xwm phiaj xwm luam tawm, yuav tsum tau them nyiaj mloog rau txoj kev raug.

Txhua qhov kev hloov hluav taws xob muaj plaub lub voj tam sim no:

① Ac circuit of power switch

② Output rectifier AC Circuit

Tawm tswv yim teeb liab qhov tam sim no lub voj

④ Cov zis tawm tam sim no lub voj Kev tawm tswv yim

Los ntawm kev them tus nqi hluav taws xob nrog qhov kwv yees dc tam sim no, lub lim hluav taws xob feem ntau ua lub luag haujlwm ntawm kev siv hluav taws xob dav dav. Ib yam li ntawd, cov lim lim tawm tau siv los khaws lub zog ntau zaus los ntawm cov khoom siv kho qhov muag thaum tshem tawm dc lub zog los ntawm lub voj voos tso tawm.

Yog li ntawd, cov xov hluav taws xob txuas ntawm cov tswv yim thiab tso tawm lim capacitors yog qhov tseem ceeb heev. Cov tswv yim thiab tso tawm cov voj tam sim no yuav tsum txuas nrog lub zog siv tsuas yog los ntawm cov xov hluav taws xob txuas ntawm lub lim lim. Yog tias kev sib txuas ntawm cov tswv yim/tso tawm hluav taws xob thiab lub zog hloov pauv/hloov hluav taws xob tsis tuaj yeem txuas ncaj qha rau lub tshuab hluav taws xob lub davhlau ya nyob twg, lub zog hluav taws xob yuav dhau los ntawm cov tswv yim lossis tso tawm lim lub tshuab hluav taws xob thiab tawg mus rau ib puag ncig.

Cov kab hluav taws xob hloov pauv ntawm lub zog hloov pauv thiab lub kho hluav taws xob muaj cov khoom siv hluav taws xob trapezoidal siab, uas muaj qhov sib xyaw ua ke siab thiab ntau zaus ntau dua li qhov hloov pauv zaus. Qhov siab tshaj plaws tuaj yeem nce txog 5 npaug ntawm qhov txuas txuas ntxiv/tso tawm dc tam sim no. Lub sijhawm hloov pauv feem ntau yog kwv yees li 50ns.

Ob txoj kab hluav taws xob feem ntau yuav tsim hluav taws xob cuam tshuam, yog li yuav tsum tau luam tawm lwm txoj hlua hluav taws xob los rau daim ntaub ua ntej cov kab hluav taws xob no, txhua lub voj peb ntu tseem ceeb ntawm lub lim hluav taws xob, lub zog hloov lossis hloov kho, inductor lossis hloov pauv yuav tsum tau muab tso rau ib sab. rau ib leeg, kho txoj hauv kev tam sim no ntawm txoj haujlwm tseem ceeb ua rau lawv luv li sai tau.

Txoj hauv kev zoo tshaj plaws los teeb tsa lub zog hloov hluav taws xob zoo ib yam li nws cov qauv tsim hluav taws xob, txheej txheem tsim qauv zoo tshaj plaws yog raws li hauv qab no:

① Hloov chaw

② Tsim lub zog hloov lub voj tam sim no

③ Tsim cov zis rectifier lub voj tam sim no

④ Kev tswj hluav taws xob txuas nrog rau AC lub tshuab hluav taws xob

thaiv

Lub zog hloov hluav taws xob muaj lub teeb liab ntau zaus, thiab ib txoj kab luam tawm ntawm PCB tuaj yeem ua tus kav hlau txais xov. Qhov ntev thiab dav ntawm kab ntawv luam tawm yuav cuam tshuam rau nws qhov kev cuam tshuam thiab kev hloov pauv hloov pauv, yog li cuam tshuam rau cov lus teb zaus. Txawm tias cov kab ntawv luam uas dhau los ntawm dc cov cim tuaj yeem ua ke rau rf cov cim los ntawm cov kab ntawv uas nyob ib sab thiab ua rau muaj teeb meem hauv Circuit Court (lossis tseem rov cuam tshuam cov teeb liab cuam tshuam).

Txhua txoj kab ntawv luam tawm hla AC tam sim no yuav tsum tau tsim los kom luv thiab dav li sai tau, uas txhais tau tias txhua yam khoom txuas nrog kab ntawv luam tawm thiab rau lwm cov kab hluav taws xob yuav tsum tau muab tso ze ua ke.

Qhov ntev ntawm kab ntawv luam tawm yog ncaj qha ncaj qha rau nws qhov inductance thiab impedance, thiab qhov dav yog sib piv sib npaug rau qhov inductance thiab impedance ntawm kab ntawv luam tawm. Qhov ntev qhia txog lub nthwv dej ntawm kab ntawv kab lus teb. Qhov ntev dua, qhov tsawg zaus ntawm kab ntawv luam tuaj yeem xa thiab tau txais hluav taws xob tsis zoo, thiab ntau zog rf nws tuaj yeem tawg.

Raws li qhov loj me ntawm cov ntawv luam tawm lub rooj tsav xwm tam sim no, kom deb li deb tau kom nce dav ntawm txoj kab hluav taws xob, txo qhov tsis kam ntawm lub voj. Nyob rau tib lub sijhawm, ua cov kab hluav taws xob, kab hauv av thiab cov lus qhia tam sim no zoo ib yam, uas pab txhim kho kev muaj peev xwm tiv thaiv suab nrov.

Hauv av yog cov ceg hauv qab ntawm plaub qhov kev hloov pauv tam sim no ntawm lub zog siv, uas yog lub luag haujlwm tseem ceeb heev uas yog cov ntsiab lus sib tham ntawm Circuit Court, thiab nws yog ib txoj hauv kev tseem ceeb los tswj kev cuam tshuam. Yog li ntawd, ua tib zoo xav txog cov kab hluav taws xob hauv av hauv kev teeb tsa. Kev sib txuas cov kab hluav taws xob hauv av tuaj yeem ua rau lub zog tsis ruaj khov.

xyuas

Kev tsim hluav taws xob tau ua tiav, nws yuav tsum tau ua tib zoo tshuaj xyuas cov kab thaiv tsim los ntawm cov tsim qauv tau ua raws txoj cai, cov cai tib lub sijhawm tseem yuav tsum tau lees paub seb puas ua tau raws li qhov xav tau ntawm PCB txheej txheem kev tsim khoom, kev tshuaj xyuas dav dav rau kab, kab thiab cov khoom sib txuas sib txuas, kab thiab sib tham sib pores, cov khoom sib txuas ncoo thiab sib txuas lus pores, los ntawm qhov thiab qhov nrug nruab nrab ntawm lub qhov yog qhov tsim nyog, seb puas ua tau raws li qhov yuav tsum tau ua.

Txawm hais tias qhov dav ntawm txoj hlua hluav taws xob thiab cov xov hlau hauv av puas tsim nyog, thiab seb puas muaj chaw rau hauv av xaim kom nthuav dav hauv PCB. Nco tseg: Qee qhov yuam kev tuaj yeem tsis quav ntsej, piv txwv li, Ib feem ntawm Cov Qauv ntawm qee qhov txuas tau muab tso rau sab nraum lub rooj tsavxwm, yog li nws yuav tsis raug tshuaj xyuas qhov sib nrug; Ib qho ntxiv, tom qab txhua qhov kev hloov pauv ntawm cov thaiv thiab lub qhov, nws yog qhov yuav tsum tau rov pleev xim tooj liab ib zaug.

Txheeb xyuas raws li “PCB daim ntawv txheeb xyuas”, suav nrog cov cai tsim, txheej txheej, kab dav, sib nrug, ncoo, Qhov Chaw, tab sis tseem tsom mus rau kev tshuaj xyuas qhov tseeb ntawm qhov tsim nyog ntawm kev teeb tsa lub cuab yeej, lub zog siv, hauv av txuas xov tooj cua, moos ceev network thaiv thiab tiv thaiv, decoupling capacitor tso thiab txuas.

Tsim cov zis

Cov ntawv sau rau cov teeb duab teeb duab:

(1) Yuav tsum tso tawm txheej thaiv txheej (hauv qab), txheej txheej luam ntawv (suav nrog cov ntawv luam saum toj kawg nkaus, luam ntawv hauv qab), txheej txheej (hauv qab vuam), txheej txheej txheej (hauv qab), ntxiv rau tsim cov ntawv drilling (NC Laum)

② Thaum teeb tsa Layer ntawm lub vijtsam luam ntawv Txheej, tsis xaiv Qhov Hom, xaiv Cov Qauv, Cov Ntawv thiab Kab ntawm sab saud (hauv qab) thiab txheej txheej luam ntawv

③ Thaum teeb tsa txheej ntawm txhua txheej, xaiv Pawg Txheej Txheem. Thaum teeb tsa Cov Txheej Txheem ntawm txheej txheej luam ntawv, tsis txhob xaiv Hom Hom, thiab xaiv Cov Txheej Txheem thiab Cov Ntawv ntawm sab saud (hauv qab) thiab txheej txheej luam ntawv.