Расчёт блока питания LED-фасада: нагрузка, дерейтинг и пусковой ток
Расчёт блока питания LED-фасада: нагрузка, дерейтинг и пусковой ток
Инженерное руководство по ветвям, дерейтингу и координации запуска.
Расчёт мощности
Load = quantity × rated watts. Preliminary PSU rating = load ÷ documented loading fraction. Available output must then be checked against the selected model's temperature and input-voltage derating curves.
Пример
Example: 24 × 36 W = 864 W; three branches give 288 W and 12 A at 24 V per branch. At an illustrative 80% loading target, each branch starts at 360 W nominal. This is not a universal rule.
Запуск и защита
Collect AC rated input, inrush peak and duration, breaker model/curve and simultaneous-start count. Verify DC cable, fuse and voltage drop separately.
Не утверждать
- No exact PSU model or derating curve.
- No inrush duration or breaker coordination.
- Parallel/redundant operation assumed without approval.
FAQ
Is 20% spare always enough?
No. Check the exact model and actual environment.
Is an SPD an inrush limiter?
No. They address different events.
Sources
Author: LikeLight Tom, Operations. Technical reviewer: 待确认.
