A PCB or luam tawm hauv Circuit Court board ua kom sov thaum hluav taws xob ntws los ntawm nws. Tsis muaj rwb thaiv tsev zoo, qhov cua sov no tuaj yeem tsim teeb meem loj rau PCBS.

Vim li cas PCBS xav tau rwb thaiv tsev?

Ua ntej koj tuaj yeem nkag siab PCB rwb thaiv tsev, koj yuav tsum nkag siab: PCB yog dab tsi?

PCBS, or printed circuit boards, are small green squares with copper sheets (but also in other colors). It can be found in almost any electronic device! Cov ntawv xov xwm hluav taws xob luam tawm ua rau cov khoom siv hluav taws xob ua haujlwm tau zoo, ua rau lawv yog ib qho tseem ceeb tab sis pom tsis tau ntawm lub neej niaj hnub. Yog tsis muaj lawv, khoos phis tawj, xov tooj, TV thiab khoom siv hluav taws xob yuav tsis ua haujlwm lossis muaj nyob.

Hluav taws xob muaj zog heev rau PCB. PCBS contain printed copper wires, so they naturally conduct electricity. Txawm li cas los xij, cov khoom siv hluav taws xob tuaj yeem ua rau muaj kev phom sij yog tias lawv tsis nyob hauv ib lub tsev uas tsis muaj hluav taws xob lossis ua kom sov dhau. PCB yuav tsum tau insulated los tiv thaiv kev txhuam tooj liab thiab txo kev sib cuag nrog cov khoom siv. Proper insulation can help prevent the PCB from overheating or exploding.

There are several ways to isolate a PCB. There are several common insulation materials, but the exact type of insulation usually depends on the application of the PCB design.

Duab qhov chaw: Pixabay

PCB insulating khoom

Cov khoom siv hluav taws xob tiv thaiv PCB feem ntau yog tsim los ua cov txheej txheem tsis tuaj yeem tuaj yeem sib xyaw ua ke hauv ntau txheej kom tso cai tam sim no kom raug kom raug los ntawm tag nrho pawg thawj coj saib Circuit Court. Yooj Yim PCBS tuaj yeem ua ib leeg lossis ib txheej. Complex PCBS, such as those used for high-speed digital communications, may contain more than two dozen layers.

PCB insulation calculator can help you determine creepage distance and electrical clearance, which will be the determining factor in the exact type and quantity of insulation material. Creepage nrug yog qhov luv tshaj plaws ntawm cov khoom siv, thiab kev tshem tawm yog lub hauv paus cais los ntawm huab cua ntau dua li cov substrate. Understanding creepage distance and electrical clearance is essential for calculating PCB insulation.

Cov tuam txhab tsim khoom lag luam PCB tuaj yeem xaiv siv ntau yam khoom sib txawv rau rwb thaiv tsev, los ntawm cov yas pheej yig xws li FR-2 mus rau cov hlau hnyav xws li txhuas. The insulating material of a PCB usually determines its use. Piv txwv li, PCB hauv cov khoom ua khoom siv hluav taws xob pheej yig yuav tsis xav tau yam rwb thaiv tsev zoo ib yam li PCB hauv lub hnub qub.

Txhawm rau nkag siab PCB rwb thaiv tsev thiab cov khoom siv rwb thaiv tsev, cia peb tshawb nrhiav tsib daim ntawv feem ntau ntawm PCB rwb thaiv tsev.

FR-2

Fr-2 yog qib qis nplaim hluav taws tsis zoo laminate xaiv. Nws yog tsim los ntawm kev sib xyaw ntawm cov ntawv thiab yas yas phenolic resin, ua rau nws lub teeb thiab ruaj khov. Cov laug cam ib leeg ib sab feem ntau siv cov khoom siv no. FR-2 tsis muaj halogen thiab hydrophobic thiab tuaj yeem nias tau yooj yim lossis zom. FR-2 yog ib qho kev xaiv uas pheej yig tshaj rau rwb thaiv tsev PCB thiab yog ib qho kev xaiv rau cov tuam txhab uas siv cov khoom siv hluav taws xob pov tseg.

FR-4

Fr-4 yog cov nplaim hluav taws kub nyhiab tshaj qhov xaiv. Nws yog cov khoom siv sib xyaw ua los ntawm fiberglass woven ntaub thiab feem ntau siv hauv kev tsim khoom ntawm ob tog thiab ntau txheej PCBS. FR-4 tuaj yeem tiv taus qhov kub thiab txias ntau dua li FR-2. Nws tseem yog cov khoom siv pheej yig, ua rau nws yog qhov kev xaiv zoo rau cov tuam txhab tsim khoom siv hluav taws xob zoo. FR-4 tsis yog tshuab nrawm, xav tau milling, stamping lossis machined tungsten carbide cov cuab yeej.

Xov tooj cua zaus (rf)

RF substrates tau tsim los tso cai rau PCBS ua haujlwm hauv daim ntawv thov siv lub zog loj RF thiab microwave. RF substrates feem ntau siv rau PCBS teeb tsa hauv kev siv tub rog, avionics thiab avionics. Nws yog ib qho tseem ceeb kom nco ntsoov, txawm li cas los xij, qee cov neeg siv khoom siv hluav taws xob muaj cov khoom zoo li no. Cov yas uas ua tau zoo ib yam RF txheej txheej tsis tsim cov rwb thaiv tsev ntau thiab ua tau zoo rau txoj haujlwm tsim hluav taws xob loj. RF thiab microwave PCBS feem ntau tsuas muaj ib lossis ob txheej xwb.

saj zawg zog

Txawm hais tias cov ntawv luam tawm Circuit Court feem ntau yog tiaj thiab txhav, muaj qee qhov tshiab PCBS uas tuaj yeem khoov hauv yuav luag txhua qhov kev coj ua yam tsis tawg. Cov kab hluav taws xob hloov pauv tau xav tau cov qauv zoo sib xws tab sis tshwj xeeb. Cov kab hluav taws xob hloov pauv tau feem ntau tiv thaiv nrog A SPRAY ntawm PCB rwb thaiv tsev, ntxiv rau zaj duab xis yas yog qhov kev xaiv nrov. Cov kab hluav taws xob hloov pauv tau xav tau nyias, muaj zog PCB txheej txheej kom lawv tuaj yeem txav tau dawb thiab haum rau qhov chaw nruj.

hlau

Kev xaiv cov hlau ua cov rwb thaiv tsev yuav zoo li coj txawv txawv. Cov hlau feem ntau yog siv hluav taws xob, thiab kev ua yuam kev tuaj yeem ua rau PCB tsis ua tiav, tua hluav taws lossis yaj. However, in some cases, a PCB with a metal substrate may be more advantageous. Hlau yog ib tus neeg ua haujlwm zoo tshaj plaws ntawm tshav kub thiab tuaj yeem tiv taus cov dej loj uas tsis tawg lossis hlawv. PCBS teeb tsa hauv cov khoom siv hluav taws xob uas siv hluav taws xob ntau yuav xav tau cov hlau hlau ua haujlwm kom zoo.

Kev lag luam cawv

Txhawm rau tiv thaiv PCB los ntawm kev ua kom sov dhau, tua hluav taws, lossis tua hluav taws, nws yuav tsum muaj qhov rwb thaiv tsev txaus. Hom rwb thaiv tsev sib raug raws li hom kev siv muab los ntawm PCB.

Lub hom phiaj siv hluav taws xob PCBS yog qhov tsim nyog rau siv nrog yooj yim dua thiab muaj txiaj ntsig ntau dua FR-2 lossis FR-4 substrates. RF substrates zoo dua rau daim ntawv thov cuam tshuam nrog lub zog loj RF.

Cov khoom siv hloov pauv tau yooj yim xws li cov yas tau ua tau zoo kom tau raws li qhov xav tau rwb thaiv tsev ntawm cov laug cam hloov pauv tau yooj yim. Cov hlau, ntawm qhov tod tes, yog cov khoom siv hluav taws xob zoo thaum ua kom lub zog hluav taws xob txias.