Lapad ng PCB Trace para sa Fuse at Shunt: Mga Panuntunan sa High-Current Layout
Para sa fuse at shunt layout, sukatin ang copper mula sa continuous current, voltage drop, at fault energy. Suriin nang sabay ang fuse pads, shunt force terminals, Kelvin points, vias, at connector exits.
Mahahalagang punto
- •Madalas mas unang magdikta ng temperatura ang fuse at shunt footprint kaysa mahabang trace.
- •Gamitin ang continuous RMS current para sa init at hiwalay na suriin ang fault energy.
- •Kailangan ng shunt ang hiwalay na force-current copper at Kelvin traces.
- •Ang via arrays malapit dito ay bahagi ng parehong current path.
- •Dapat i-lock ng buyers ang finished copper, shunt package, fuse geometry, via plating, at test current.
Mabilis na sagot
- Madalas mas unang magdikta ng temperatura ang fuse at shunt footprint kaysa mahabang trace.
- Gamitin ang continuous RMS current para sa init at hiwalay na suriin ang fault energy.
- Kailangan ng shunt ang hiwalay na force-current copper at Kelvin traces.
- Ang via arrays malapit dito ay bahagi ng parehong current path.
- Dapat i-lock ng buyers ang finished copper, shunt package, fuse geometry, via plating, at test current.
Decision matrix
| Sitwasyon ng board | Pangunahing risk | Inirerekomendang aksyon | Escalate kapag |
|---|---|---|---|
| Blade o cartridge fuse sa PCB | Mainit na clips, pads, at exits | Malapad na copper sa dalawang terminal at iwasan ang makitid na thermal relief | Umiinit ang holder, relay, o enclosure |
| SMD current shunt | Error dahil sa shared copper drop | Paghiwalayin ang force current at Kelvin | May mV error sa ADC o malapit sa limit ang shunt |
| Battery o motor path | Fault energy at via bottleneck | Short pours, maraming vias, at conservative spacing | Maaaring masira copper bago mag-clear ang fuse |
| Power-entry board para sa procurement | Binabago ng supplier ang copper o package | Tukuyin ang copper, shunt, fuse, at full-current test | May substitution sa package, plating, o copper |
Sizing workflow
- Tukuyin ang continuous current, surge, max ambient, enclosure temperature, at allowed voltage drop.
- Kalkulahin ang long copper at markahan ang fuse lands, shunts, connector exits, neck-downs, at layer transitions.
- Sa shunt, padaanin ang current sa malalaking terminals at kunin ang Kelvin mula sa defined points.
- Sa fuse, suriin ang real package, holder temperature, heat spreading, solder, at clips.
- Kalkulahin ang via arrays gamit ang current per via, plating, drill, at spreading copper.
- I-document ang current, copper, shunt value, fuse part, test duration, at acceptable temperature rise.
Release checklist para sa fuse at shunt
| Sitwasyon ng board | Pangunahing risk | Inirerekomendang aksyon | Escalate kapag |
|---|---|---|---|
| Continuous current | Worst-case RMS stated | Copper heating at drop | Walang duty o enclosure temp |
| Fuse interface | Part, holder, o link fixed | Pad geometry at local heat | Pinalitan ng similar package |
| Shunt routing | Force at Kelvin separated | Accuracy at noise | Sense after shared drop |
| Layer transitions | Via at plating reviewed | Iwas hot via fields | Wide pour dumaan sa few vias |
| Procurement data | Copper at test locked | Iwas downgrade | Flexible ang copper o part |
Kaugnay na calculators at guides
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Mabilis na FAQ
Gaano kalapad ang trace sa paligid ng PCB fuse?
Magsimula sa continuous current at allowed temperature rise, pagkatapos suriin ang fuse land, pad exit, at via.
Paano i-route ang current shunt?
Idaan ang load current sa maikli at simetrikong copper at kunin ang Kelvin direkta sa shunt sense points.
Sa fuse rating ba o load current ang sizing?
Pareho. Ang load ang tuloy-tuloy na init at drop; ang fuse at fault ang short stress.
Kailan gagamit ng 2 oz copper?
Kapag hindi sapat ang 1 oz pads at neck-down para sa temperature o voltage-drop target.
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