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Forums
Engineering
Electrical Engineering
High inrush current for LED drivers
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[QUOTE="Ivan Seeking, post: 6423101, member: 689"] One issue I ran across recently involved 24-volt IR LED drivers for IR cameras, in a factory. The LED units were each rated as 0.5 amp loads. The camera was on the same circuit and only pulled about 250 ma. The engineer had specified 2 amp fast-acting fuses to protect the camera circuit and they were popping all over the factory. I investigated and found that we were pulling over 6 amps on each LED driver circuit, on startup. And that was just what I could catch on a meter. The current then dropped to the nominal value. This particular manufacturer didn't list the inrush current in the specifications which is why our engineer had missed it. I did a little checking and found that LED driver circuits, and particularly IR LED drivers, have high inrush currents that can be as much as 100 times greater than the nominal load. [URL]https://www.ametherm.com/blog/inrush-current/inrush-current-protection-led-lighting-retrofits/[/URL] Technologies exist to limit the inrush in LED circuits. In our case, we were able to exchange the drivers for some that had current limiting. [/QUOTE]
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High inrush current for LED drivers
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