Lapad ng trace sa heavy-copper PCB: 2 oz, 3 oz, bus bar, at buyer checks
Gumamit ng heavy copper kapag ang tunay na current path ay hindi pumapasa sa temperature rise o voltage drop gamit ang praktikal na 1 oz o 2 oz pours. Lumipat sa 2 oz kapag current, enclosure, o area ay nagpapahirap sa lapad; piliin ang 3 oz o bus bar pagkatapos suriin ang pads, neck-downs, vias, clearances, solderability, at supplier rules.
Mahahalagang punto
- •Binabawasan ng heavy copper ang resistance at ikinakalat ang init, pero hindi nito inaayos ang makitid na pad o via field.
- •Praktikal ang 2 oz para sa maraming 8A-25A paths; kailangan ng DFM para sa 3 oz.
- •Maaaring humingi ng mas makapal na copper ang voltage drop kahit pasado ang temperatura.
- •Mas mainam minsan ang bus bar o copper strap kaysa sobrang etched copper.
- •Dapat i-lock ng buyer ang finished copper, plating, spacing, test current, at etching capability.
Mabilis na sagot
Gumamit ng heavy copper kapag ang tunay na current path ay hindi pumapasa sa temperature rise o voltage drop gamit ang praktikal na 1 oz o 2 oz pours. Lumipat sa 2 oz kapag current, enclosure, o area ay nagpapahirap sa lapad; piliin ang 3 oz o bus bar pagkatapos suriin ang pads, neck-downs, vias, clearances, solderability, at supplier rules.
Matrix ng 2 oz, 3 oz, at bus bar
| Option | Pinakamainam | Buyer check | Pangunahing risk |
|---|---|---|---|
| 1 oz wide pours | Low-medium current na may area at airflow | Kumpirmahin ang lapad pagkatapos ng connector at thermal relief | Voltage drop o local pads ang failure |
| 2 oz finished copper | Compact power paths, maraming 8A-25A boards | Kumpirmahin finished copper, spacing, plating | Mas mahirap ang fine pitch |
| 3 oz o higit pa | High current density, sealed product, short power entry | DFM bago routing at etch compensation | Tumataas cost, spacing, soldering |
| Bus bar o copper strap | Hindi praktikal ang etched copper dahil sa current o drop | I-define assembly, fastening, plating, creepage, test | Mechanics ang reliability limit |
Sizing workflow
- I-define ang continuous RMS, surge, max ambient, enclosure temperature, target rise, at allowed drop.
- Kalkulahin ang pinakamahabang copper at markahan ang connector pads, fuses, shunts, neck-downs, thermals, at layer changes.
- I-check muna kung sapat ang mas malapad na 1 oz o 2 oz.
- Para sa 3 oz pataas, kumpirmahin spacing, ring, plating, mask, at etching bago release.
- I-review bilang assembly: connector, copper, vias, fasteners, solder, at external conductor ay may parehong current.
Checklist sa buyer at fabrication
- Finished copper ang nakasaad.
- Minimum trace at space ay confirmed.
- Bawat via array may current-per-via calculation.
- Walang hidden neck-down sa connectors, terminals, shunts, at fuses.
- Voltage drop budget sa mV o percent.
- Quote notes may test current, ambient, at bus bar requirement.
Engineering recommendation
Para sa karamihan ng boards: palaparin muna ang copper, saka 2 oz, saka 3 oz, saka bus bar o external conductor.
Release-ready design states current, copper, voltage drop, via assumptions, connector limits, supplier DFM, at test condition.
Mabilis na FAQ
Kailan gagamit ng heavy copper?
Kapag hindi kaya ng normal copper ang current, temperatura, o voltage drop sa available area.
Mas mabuti ba ang 3 oz kaysa 2 oz?
Hindi palagi. Mas mababa ang resistance ng 3 oz pero mas mahirap sa paggawa, etching, soldering, at cost.
Kailangan pa bang suriin ang vias?
Oo. Maaaring ma-limit ang malapad na pour ng kulang na vias.
Kailan gagamit ng bus bar?
Kapag sobrang lapad, kapal, spacing, o supplier risk ang kailangan ng etched copper.
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Mabilis na FAQ
Kailan gagamit ng heavy copper?
Kapag hindi kaya ng normal copper ang current, temperatura, o voltage drop sa available area.
Mas mabuti ba ang 3 oz kaysa 2 oz?
Hindi palagi. Mas mababa ang resistance ng 3 oz pero mas mahirap sa paggawa, etching, soldering, at cost.
Kailangan pa bang suriin ang vias?
Oo. Maaaring ma-limit ang malapad na pour ng kulang na vias.
Kailan gagamit ng bus bar?
Kapag sobrang lapad, kapal, spacing, o supplier risk ang kailangan ng etched copper.
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