Cov teeb meem twg yuav tsum tau them nyiaj rau hauv PCB teeb meem ntawm cov khoom siv hluav taws xob?

一, Kev Tswj thermal: los ntawm tshav kub dissipation txoj kev mus rau thermal kuj tswj
1. Kev ua kom zoo ntawm tshav kub dissipation txoj kev
Tej zaum yuav tshaj tus nqi rated (xws li 125℃rau silicon- randing DIC
Copper thaj av suav: 8-10 hli ² daim tawv nqaij kub tsis muaj kev zam rau txhua 1W kev siv fais fab. Piv txwv li, qhov kawg 10a rectifier diode yuav tsum muaj tsawg kawg yog cov tawv nqaij liab, tab sis hauv qhov kub ntawm lub zog ntawm lub zog ntawm 150 qhov kub thiab ua rau muaj kev ua tsis tau.
Ib co photovoltaic inverter txo qis kev sib tshuam kub ntawm SIC DIODES los ntawm 120 Qib rau 95℃los ntawm nce ntawm ntom ntom ntom.
Heat dissipation fins and thermal conductive materials: High power scenarios (such as>50W) yuav tsum tau siv cov cua sov dissipation fins, thiab thermal ua silicone (thermal kuj 0.1 {} 0.5℃/ w) yog siv los txo kev sib cuag thermal tiv thaiv. Ib lub tsheb hluav taws xob them cov chaw nres tsheb adopts Lub tais dej txias ua ntej + Thermal ua lub zog silicone, uas nce lub zog hluav taws xob rau 5kW / l.
2 cov ntsiab lus kub pib
Kev tsim cua sib txuas: Cov cua sov (xws li cov khoom siv cua sov thiab mosfets) yuav tsum tau teem rau hauv qhov kev taw qhia ntawm kev tiv thaiv huab cua (xws li inductors) thaiv cov huab cua. Ib qho kev lag luam muaj zog muaj zog ntawm kev nce siab hauv nruab nrab ntawm 20℃vim muaj transformer thaiv huab cua sib.
Kev faib cov txheej txheem: Cov khoom siv tau muab faib raws li lawv cov cua sov. Cheebtsam nrog cov cua sov tsis zoo (xws li muab cov pa hluav taws xob hluav taws xob) tau muab tso rau cov pa hluav taws xob (xws li cov cua sov tsim hluav taws xob (xws li muab tso rau hauv qab. Lub zog muab ntawm qee yam neeg rau zaub mov tau tsim nrog kev faib kom txo tau cov kev kub tshaj plaws los ntawm 15 degree.
Thermal rhiab ntaus kev tiv thaiv: Crystal oscillator nrog cov khoom kub qis dua yuav tsum tau muab tso rau ntawm cov khoom siv cua sov lossis hauv qab ntawm cov khoom siv cua sov.
2, electromagetic compatibility (EMC): Parasitic Parameter tswj thiab teeb liab kev sib cais
Txoj kev sau LC oscillation thiab tsim lub Peak voltage. Piv txwv li, nyob rau hauv ib qho phiaj xwm adapter, qhov kev ncua deb ntawm cov diode thiab lub tshuab lim dej tau 50 hli, thiab ntsuas hluav taws xob rov qab yog 400v), ua rau muaj kev cuam tshuam.
Kev sib xyaw ua ke: Cov diode yuav tsum nyob ib sab ntawm tus choj saib xyuas lossis thauj khoom siv lub davhlau ya nyob twg lossis cov hmoov txhuas yuav tsum tau tswj tsis pub dhau 5 hli; Lim capacitors tau teem sijhawm ze rau tsim cov qauv "DIODE Capacitor" Circuit. Ib qho kev sib txuas lus hluav taws xob txo qis dua cov pa rov qab voltage los ntawm 600V rau 380v los ntawm luv txoj kev.
Decoupling capacitor txheej: lub suab nrov siab lim dej lim (xws li 0.1 μ f Ib qho DC {{4 4} DC converter ua kom zoo rau cov khoom siv hluav taws xob kom txo cov zis Ripple los ntawm 200MV mus rau 50MV.
Kev sib cais ntawm kev sib cais thiab hauv av
Ib qho taw tes hauv av: lub zog Circuit Court thiab tswj Circuit Court yog sib cais thiab tau txais yuav ib qho ntsiab lus hauv av. Piv txwv li, cov cheebtsam ib puag ncig ntawm Thawj PWM tswj IC tau cog lus rau lub IC av, thiab tom qab ntawd txuas rau hauv av ntawm cov Capacitor loj; Cov khoom sib xyaw ib ncig ntawm cov thib ob tl431 tau cog lus rau nws tus lej thib 3 thiab tom qab ntawd txuas nrog cov zis cap capacitor av. Ib yam khoom siv hluav taws xob muaj nce nws cov kev xeem EMI dhau los ntawm 60% mus rau 95% dhau los ntawm kev sib tw taw tes.
Kev sib cais me me: cov paib tseem ceeb (xws li cov kab lus tam sim no, cov xov tooj tam sim no (txuas ntau dua lossis sib npaug ntawm 2 hli. Kev tswj tsis tseeb ua rau muaj qee tus tsav tsheb muaj zog nce 30% vim yog cov teeb liab kab ua kom sib haum rau lub zog hluav taws xob.
3, Txheej Txheem Kev Txhim Kho: Pad Tsim thiab Vuam Kev Tswj
1. Tsim cov cim tshwj xeeb rau cov phuam qhwv
Qhov loj me sib xws: tsim cov ntaub qhwv solder nruj raws li kev siv cov phau ntawv ntim. Piv txwv li, qhov ntev ntawm Do-214AC pob pob ntim pob tw yuav tsum yog 6.5 ± 0.5mm. Yog tias tsim los ua 5 hli, nws yuav ua rau muaj soldering virtual. Vim tias tsis raug ncoo loj, lub virtual soldering feem ntawm dodes nyob rau hauv ib tug neeg siv khoom hluav taws xob ntau lawm 15%.
Daim Ntawv Qhia Txog Tus Kheej: Polarized doneskes (xws li schottky diodes) yuav tsum tau sau npe nrog anode (a) thiab cathode (k) ntawm pcb kom tsis txhob muaj kev sib txuas. Ib co photovoltaic inverter tau hlawv tawm vim yog kev sib txuas rov qab ntawm dodes, uas ua rau ploj ntawm tshaj 500000 Yuan.
2 Vuam Txheej Txheem Tswj
Reflow soldering temperature curve: peak temperature controlled at 240 ± 5 ℃, holding time 30-60 seconds. Excessive temperature (>260 Qib) tuaj yeem ua rau oxidation ntawm diode chips, thaum tsis muaj qhov kub tsis txaus (<220 ℃) can trigger cold soldering. Due to uncontrolled reflow soldering temperature in a certain automotive electronics production line, the yield of diode soldering decreased from 99% to 85%.
Yoj schering tshem tawm immersion tob ntawm qhov tob ntawm pins rau hauv kev yog 1 / 2-2 / 3 ntawm qhov ntev. Vim tias tsis txaus tin immersion, cov pins ntawm qee lub zog module peeled tawm ntawm pcb, ua rau 20% nce ntxiv rau kev kho tus nqi.
4, Kev Nyab Xeeb Kev Nyab Xeeb: Kev Tshuaj Ntsuam Hluav Taws Xob thiab Kev Tiv Thaiv Hluav Taws Xob
1. Hluav taws xob clearance thiab croppage nrug
Cov Qauv Yuav Tsum Tau: Thaum cov lus qhia voltage yog 50V-}} {} {} {} {{ Qhov kev ncua deb ntawm thawj sab thiab sab nraud sab nraud yuav tsum muaj ntau dua lossis sib npaug rau 6.4mm. Vim tsis muaj kev tshem tawm, lub zog kho mob uas ua rau lub siab siab- voltage sab thiab tsawg-voltage sab rau sib tsoo, ua rau muaj kev nyab xeeb.
Slotting sib cais: yog qhov kev ncua deb ntawm ob txhais ceg ntawm cov ceg ntawm cov khoom siv tsawg dua los yog sib npaug ntawm 6.4mm, slotting (dav ntau dua los yog sib npaug los ntawm 1 hli) yuav tsum tau txhim kho rwb thaiv tsev. Ib tus maub los muaj ntau dua tus nqi ntawm voltage tiv thaiv kev sim los ntawm 70% txog 100% los ntawm kev tsim qauv.
2 tiv thaiv kev tsim qauv

ESD Kev Tiv Thaiv: Ntxiv lub nplhaib tiv thaiv tus kheej (dav dav dav dua lossis sib npaug nrog 0.5 hli) ze rau ntawm Diod PIN, thiab siv lub isti- zoo li lub hau dab teg thiab ua haujlwm thaum sib dhos. Vim tias tsis muaj anti {- zoo li cov neeg siv khoom hluav taws xob ntau lawm, tus nqi ntawm Diode cov neeg siv khoom ntau lawm, nce ntxiv ntawm 2% mus rau 15%.
Kev Tiv Thaiv Surge: Tus thim rov qab withstand voltage tus nqi yuav tsum yog 1.5-2 zaug ntawm 100 ω, capacitance ntawm cov 0.1-0.47 μ f) yuav tsum tau ntxiv. Qee qhov 220V AC Rectifier Circuit Txwv siv 300v voltage resistant donges, thiab thaum daim phiaj voltage hloov mus rau 2440v, uas ua rau muaj kev puas tsuaj hauv kev tawg.