eagle1109
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No, that wouldn't work. I think the "custom DC-DC module" is just advertising hype for "a coil on a small PCB to save space" as the name implies it is already DC entering it and it is therefore already rectified by diode(s) and filtered with capacitors.Is my guess right that there's no diodes and they are using caps instead?
No, that wouldn't work. I think the "custom DC-DC module" is just advertising hype for "a coil on a small PCB to save space" as the name implies it is already DC entering it and it is therefore already rectified by diode(s) and filtered with capacitors.
The power rating is confusing but what it tells you is the individual rating of each output when used alone. The 650W limit is the total the power supply can manage across all the loads, meaning they can't all be run at full load at the same time.
Did you try the resistance tests I mentioned in post #20 yet ?
Brian.
davoud has just replied to a thread you have subscribed to entitled - PC power supply short circuit - in the Power Electronics forum of Forum for Electronics.
This thread is located at:
https://www.edaboard.com/showthread.php?t=370386&goto=newpost
Here is the message that has just been posted:
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As friends said,
You must first check the double-diodes. Double-diodes packet are similar to the MOSFETs that you shown or slightly larger. I guess one of diodes is burnt.
Double diodes usually mounted to a heat sync. please check components mounted to heat sync at the corner of photo.Attachment 141456 (https://www.edaboard.com/attachment.php?attachmentid=141456)
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.my best guess would be one of the capacitors under the black sleeve on the heatsink fin is responsible, if not those, my second guess would be the devices on the heatsink itself
Features
• MOSFET for ORing and Uninterruptible Power Supply
• Qualified according to JEDEC1) for target applications
• N-channel
• Normal level
• Ultra-low on-resistance R DS(on)
• 100% Avalanche tested
• Pb-free plating; RoHS compliant
I know I need a schematic and an oscilloscope, but I can't find the schematic online if you can help me in this problem. And I don't think I need an oscilloscope, at least for now.
Your third point is "an understanding of switching power supplies", well SMPS units are a lot of models and this one I have is one of the new models and complex to me. And learning to me is not a matter of watching videos and search for documents about SMPS, I need to investigate the problem in the practical aspects and I need to try and try until I learn and find the problem.
I heard from a doctor in a US university who teaches electronics on YouTube, that you can't be an engineer that easy! You may destroy a lot of devices until you learn something.
So, learning by looking into documents is not the way to go, I have to practice and try.
Because, before I didn't know anything about power supplies, and how would I know at least something! Of course by looking into the unit and learn little theoretical information and compare that to what I have.
One thing for sure I know, is that I won't be good in troubleshooting that easy, I have to learn by doing in practice and learning in theory.
And this unit is not a simple electronic circuit, it's a complex system even if the problem is easy for other people to determine and fix, but it's difficult to me.
I know learned a lot of things in electronics and embedded systems, but fixing problems is difficult to me, but I fixed a lot of problems in programming microcontrollers which are basically easy and beginners problems but I learned by posting online and watching videos and reading articles and documents.
But fixing a modern PSU is hard to me, it's really not that easy.
If I'm loosing this PSU, then it's OK not to throw it and try to learn something from it. That's my goal.
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