i would like to run my M-140 diode without any active cooling or TEC
what is the magic point where it can run for hours without damage?
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i would like to run my M-140 diode without any active cooling or TEC
what is the magic point where it can run for hours without damage?
I suppose it all depends on the size and material of your diode mount
what do you intend to use?
... I'm using them with a big passive cooler and currents from 500 - 800mA without remarkable heating for laser-cutting ... It's mostly CW ON for some ten seconds, then OFF for some milliseconds (moving to next line start) with job-times of some ten minutes.
Testing with 1Amp for some minutes was OK too.
I'm running much stronger IR-diodes with highest of 80-90% of the max. ratings (max. 4.5Amps instead of 5A, or max. 8A for 9A) with only passive cooling ... not hitting the max. ratings and thus avoid (over-) heating can increase the lifetime to nearly infinite ;-)
Here the link to a wiki-page I've set up for laser-cutting hints: http://reprap.org/wiki/Laser_Cutter
Viktor
http://images.villageorigin.com/0064.../001.jpg?s=300 Dimensions: 16 x 50mm
its a big black one, with no need of pressing a diode in, which i like because i allready replaced one diode...
i have a glass aixiz lens made for 405-445nm with AR coating
and no driver (will try making one myself, trying to figure out now what to supply the diode)
it will be put in a laser scanner (cheap one with steppers) it does have one fan, but its at the far end of the box...
edit: i also have a 30mW green box (identical) and i dont want <1W as it would overpower the green one
I use my M140 diodes in Aixiz cylindrical mounts, clamped in Pat's mounts (not a whole load of contact area between barrel and mount), which is screwed to a baseplate.
No other cooling applied.
I run these at 1000mW output power in projectors that are 'on' all night (8+ hours) with no problems, and have done for 18 months +
casio run 24 diodes in a small ally heat sink with no tec cooling
... but with only 500mA or 0.5Watts each, so not really overpowered ;-)Quote:
Originally Posted by andy_con
Viktor
so i could probably run 500mA with ease as my casing is pretty big + a tiny bit of air going thrugh
now @ how much Volts?
... I'm driving all my diodes with LM317 or LM338 as current-regulators and max. 12 Volts - the effective voltage will follow the current adjusted by the LM's.
The current ranges for the different diodes go from 200mA for 405nm-bluray-diodes to 8Amps with the 25Watt-IR-diodes ...
Viktor
i use small heat sinks and forced air. i drive them pretty hard. remember, they're under modulation in a projector, so the duty cycle is low.
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