| Electronics > Projects, Designs, and Technical Stuff |
| DPS 5020 as Fiber laser diode power supply |
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| MDM3D:
Hello EEVBlog Forum users, I have stumbled upon an ebay listing for a bunch of IPG PLD-30-974 30W fiber laser diodes. I know little about the power supply requirements of driving a laser diode other than that they are "sensitive" to over voltage and over current and that dedicated laser driver power supplies are expensive. I have played around with the ruideng DPS 5020 power supply modules before and based on my limited knowledge they seem to fit the bill for this Laser diode. they can alsy be controlled with a pc or micro easily. I have read a few other posts on the forum that recommend a fixed voltage supply with current limiting resistors and a low side switch but that seems a little too crude as compared to the dps 5020 offerings. Please advise if I should jump off this crazy train. I have done a fair bit of research on the various lasers themselves and will be purchasing all of the safety equipment/enclosures/interlocks. Currently I am just trying to figure out a cheap way of powering this laser for use in a (to be built) laser cutter. |
| Benta:
Power laser diodes have a built-in photodiode for feedback. This should not be ignored and be used for controlling the laser driver. A simple power supply and limiting resistor will not do the trick. |
| MDM3D:
This particular device has only 2 leads and as far as I can tell does not have a photo diode. |
| ajb:
Constant voltage and a resistor is actually okay for low power, low precision testing (IE, 'is it dead?'), in fact it's a better bet than using a typical bench supply in CC mode with no resistor (best method is a bench supply in CC/CV mode, with appropriate current voltage limits set, *and* a resistor). Copackaged photodiodes are not actually all that common among commodity diode lasers. You still see them in OPSL heads and scientific modules, but these are not actually part of the laser diode itself but fitted somewhere else in the optical assembly. Diode driver requirements really depend on the application, but as a rule they should be designed as current sources first, above all else. Without knowing what the topology of the DPS 5020 is like it's impossible to say how good of a laser diode driver it would be. A basic linear constant current driver is pretty simple as long as you're not too concerned with efficiency, high modulation rates, or super high stability (in which case you really want a photodiode). Anything used for experimentation should also have saturation detection to disable the power stage when the diode is disconnected, otherwise the diode will get a nasty wallop if it gets connected with the driver enabled. What are you looking to do with the diode? |
| MDM3D:
AJB, the DPS5020 is a Buck converter SMPS module low side switched. I would be using this laser to cut plastic, wood, ablate paint off of copper PCB's for etching and do basic metal marking. please see the link below for a DPS 5020 overview https://www.eevblog.com/forum/testgear/testreview-of-power-supply-frontend-dps5015-50v15a/ The DPS5020 is a larger supply of the same topology as the DPS5015. below is a link to the laser diode's datasheet https://www.ipgphotonics.com/en/641/Widget/PLD-40+Laser+Diode+Datasheet.pdf |
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