I-Copper iyisendlalelo sensimbi esivamile esisebenza phezu kwebhodi lesifunda (PCB).Ngaphambi kokulinganisa ukumelana kwethusi ku-PCB, sicela uqaphele ukuthi ukumelana kwethusi kuyahlukahluka nezinga lokushisa.Ukulinganisa ukumelana kwethusi endaweni ye-PCB, le fomula elandelayo ingasetshenziswa.
Lapho kubalwa inani elijwayelekile lokumelana ne-conductor R, le fomula elandelayo ingasetshenziswa.
ʅ : ubude bekhondatha [mm]
W: ububanzi bekhondatha [mm]
t: ukujiya kwe-conductor [μm]
ρ : conductivity of conductor [μ ω cm]
Ukumelana nethusi kuku-25°C, ρ (@ 25°C) = ~ ~1.72μ ω cm
Ngaphezu kwalokho, uma wazi ukumelana kwethusi endaweni ngayinye yeyunithi, i-Rp, emazingeni okushisa ahlukene (njengoba kuboniswe esithombeni esingezansi), ungasebenzisa ifomula elandelayo ukulinganisa ukumelana kwethusi lonke, R. Qaphela ukuthi izilinganiso ze-demensions ithusi eliboniswe ngezansi liwugqinsi (t) 35μm, ububanzi (w) 1mm, ubude (ʅ) 1mm.
I-Rp: ukumelana nendawo yeyunithi ngayinye
ʅ : ubude bethusi [mm]
W: ububanzi bethusi [mm]
t: ukujiya kwethusi [μm]
Uma izilinganiso zethusi ziyi-3mm ububanzi, 35μm ubukhulu kanye no-50mm ubude, inani lokumelana no-R lethusi ku-25°C
Ngakho, lapho i-3A yamanje igeleza ithusi endaweni ye-PCB ku-25°C, i-voltage yehla cishe ngo-24.5mV.Nokho, lapho izinga lokushisa likhuphukela ku-100℃, inani lokumelana likhuphuka ngo-29% futhi ukwehla kwamandla kagesi kube ngu-31.6mV.
Isikhathi sokuthumela: Nov-12-2021