Me pehea te tere whakatau tata i te aukati o te waea parahi mata PCB?

Ko te parahi he paparanga whakarewa noa i runga i te mata o te poari ara iahiko (PCB). I mua i te whakatau tata i te parenga o te parahi i runga i te PCB, kia mohio koe he rereke te parenga o te parahi ki te pāmahana. Ki te whakatau tata i te ātete o te parahi i runga i te mata PCB, ka taea te whakamahi i te tātai e whai ake nei.

Ina tātaihia te uara ātete kawe kawe R, ka taea te whakamahi i te tauira e whai ake nei.

resistance of PCB surface copper wire

ʅ : te roa o te kaikawe [mm]

W: te whanui kawe [mm]

t: te matotoru o te kaikawe [μm]

ρ : te kawe o te kawe [μ ω cm]

Ko te parenga o te parahi kei te 25°C, ρ (@25°C) = ~1.72μ ω cm

I tua atu, ki te mohio koe ki te parenga o te parahi mo ia waeine rohe, Rp, i nga mahana rereke (penei i te ahua i raro nei), ka taea e koe te whakamahi i te tauira e whai ake nei hei whakatau tata i te parenga o te parahi katoa, R. Kia mahara ko nga ine o te Ko te parahi e whakaatuhia ana i raro nei ko te matotoru (t) 35μm, te whanui (w) 1mm, te roa (ʅ) 1mm.

resistance of PCB surface copper wireresistance of PCB surface copper wire

Rp: te parenga mo ia waahanga waahanga

ʅ : parahi roa [mm]

W: whanui parahi [mm]

t: te matotoru parahi [μm]

Mena he 3mm te whanui o te parahi, he 35μm te matotoru me te 50mm te roa, ko te uara parenga R o te parahi i te 25°C he

resistance of PCB surface copper wire

Ko te kupu, ka 3A nāianei rere parahi i runga i te mata PCB i 25°C, maturuturu te ngaohiko e pā ana ki 24.5mV. Heoi, ka piki te pāmahana ki te 100 ℃, ka piki te uara ātete ki te 29%, ka 31.6mV te heke ngaohiko.

full auto SMT production line


Wā tuku: Noema-12-2021