急求: 220v 串联多大的电阻使3v LED显示最好?需要详细的理解过程?谢谢!

2024-12-03 16:02:27
推荐回答(1个)
回答1:

最好不要这样对LED显示屏供电!!!如果一定要这样用,首先得测量出显示屏正常工作时它所需要的工作电流是多大,然后用220V除以所得出的电流值(要换算成安培),得的来的值就是所需配接的电阻值(欧姆)。而后,还得计算出该电阻所应具有的耗散功率。计算公式:电阻的耗散功率(w)=220V×电流(A)2。这里的电流值就是前面计算出来的电流值。上面说的电阻值是一个参考参数,功率值则是硬性参数,一定要满足。通电试一下,然后再根据显示屏的亮度对电阻值的大小进行相应调整。
你所说的11000欧4.4w的电阻可以用11k/5w的电阻代替。

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