Yuav ua li cas sai sai kwv yees qhov tsis kam ntawm PCB nto tooj liab hlau?

Tooj liab yog cov txheej txheem hlau uas muaj nyob rau saum npoo ntawm lub rooj tsav xwm Circuit Court (PCB). Ua ntej kwv yees qhov tsis kam ntawm tooj liab ntawm PCB, thov nco ntsoov tias qhov tsis kam ntawm tooj liab sib txawv nrog qhov kub thiab txias. Txhawm rau kwv yees qhov tsis kam ntawm tooj liab ntawm PCB nto, cov qauv hauv qab no tuaj yeem siv.

Thaum xam tus nqi ntawm tus neeg xyuas pib tsis kam R, cov qauv hauv qab no tuaj yeem siv tau.

resistance of PCB surface copper wire

ʅ: conductor length [mm]

W: conductor dav [mm]

t: conductor thickness [μm]

ρ : conductivity ntawm conductor [μ ω cm]

Lub resistivity ntawm tooj liab yog 25 ° C, ρ (@ 25 ° C) = ~ 1.72μ ω cm

Tsis tas li ntawd, yog tias koj paub qhov tsis kam ntawm tooj liab rau ib cheeb tsam, Rp, ntawm qhov sib txawv ntawm qhov kub thiab txias (raws li qhia hauv daim duab hauv qab no), koj tuaj yeem siv cov qauv hauv qab no los kwv yees qhov tsis kam ntawm tag nrho cov tooj liab, R. Nco ntsoov tias qhov ntev ntawm tooj liab qhia hauv qab no yog thickness (t) 35μm, dav (w) 1mm, ntev (ʅ) 1mm.

resistance of PCB surface copper wireresistance of PCB surface copper wire

Rp: tiv thaiv ib cheeb tsam

ʅ: tooj liab ntev [mm]

W: tooj liab dav [mm]

t: tooj liab thickness [μm]

Yog hais tias qhov ntev ntawm tooj liab yog 3 hli dav, 35μm nyob rau hauv thickness thiab 50mm nyob rau hauv ntev, tus nqi kuj R ntawm tooj liab ntawm 25 ° C yog

resistance of PCB surface copper wire

Yog li, thaum 3A tam sim no ntws tooj liab ntawm PCB nto ntawm 25 ° C, qhov hluav taws xob poob txog 24.5mV. Txawm li cas los xij, thaum qhov kub nce mus txog 100 ℃, qhov kev tiv thaiv tus nqi nce 29% thiab qhov hluav taws xob poob dhau los ua 31.6mV.

full auto SMT production line


Post lub sij hawm: Nov-12-2021