- Joined
- Sep 24, 2010
- Messages
- 34
- Points
- 8
I have a history of killing 445nm diodes, probably $300 in the hole over a period of 5 years.
Not from too much current but from overheating or too long a duty cycle.
So I just bought one of DTR 7w NUBM44 V2 450nm Diode In 12mm Copper
I got the 12mm so I could attach a thermistor connected to a temperature relay circuit I have as close as possible to the diode, but I want to get an idea of what temperature I should use to protect the laser diode. I still plan to add more heatsink, but wanted to be able to place the sensor inside the larger heatsink and thus closer to the 12mm housing.
My goal is a fail proof 7w system, even if it lasts a few seconds before cutout that will be okay, just want a margin of safety in place for the most expensive component (the diode), but I've not enough money to experiment with how hot the module can get before failure occurs.
1. What temperature of the 12mm housing would you recommend to maximize duty cycle without compromising the laser?
2. What is the most simple solution you guys have discovered to cut off the laser? I think a 1 time use thermal fuse might be the easiest once all the other parameters are set, but for now I have a more complex temperature relay circuit I am using so I can experiment.
Not from too much current but from overheating or too long a duty cycle.
So I just bought one of DTR 7w NUBM44 V2 450nm Diode In 12mm Copper
I got the 12mm so I could attach a thermistor connected to a temperature relay circuit I have as close as possible to the diode, but I want to get an idea of what temperature I should use to protect the laser diode. I still plan to add more heatsink, but wanted to be able to place the sensor inside the larger heatsink and thus closer to the 12mm housing.
My goal is a fail proof 7w system, even if it lasts a few seconds before cutout that will be okay, just want a margin of safety in place for the most expensive component (the diode), but I've not enough money to experiment with how hot the module can get before failure occurs.
1. What temperature of the 12mm housing would you recommend to maximize duty cycle without compromising the laser?
2. What is the most simple solution you guys have discovered to cut off the laser? I think a 1 time use thermal fuse might be the easiest once all the other parameters are set, but for now I have a more complex temperature relay circuit I am using so I can experiment.