Electronics > Projects, Designs, and Technical Stuff
Lab power supply over-voltage when turning on
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raresvintea:
Nope, I will take some time to open
Siwastaja:
Simple,

A broken-by-design, piece-of-shit trap garbage device. The options are,

1) Throw it away, buy a proper one,
2) Only use it for secondary, non-critical purposes, add a warning sticker
3) Take it apart, reverse-engineer, analyze the circuitry, find the problem and develop a fix. Can be a great learning experience.
Conrad Hoffman:
That's a completely unacceptable flaw. Come up with a fix or throw it away, lest it cost you ten times what the supply cost in terms of wrecked boards and failed projects.
duak:
If the current limit is set to minimum, does the output voltage also go to zero?  Many lab supplies do this, and I use this feature to set the output voltage to zero without shutting the mains switch off.  With any luck you may find that with the current limit set to minimum, the supply does not generate a voltage transient.
H713:
The lazy solution is just to add a load switch and a warning sticker. IMO, it is a feature that all bench power supplies should have. A big transient on power up is something that is ideally avoided in power amplifiers and absolutely completely unacceptable in a bench power supply, especially one of that magnitude. One other solution is to have a relay and a 1 second delay timer so the load is connected after the power switch is turned on. Many power amplifiers use this solution to avoid the loud "thump" when it is turned on (this is actually part of the speaker protection circuit- last thing speakers want to see is DC).

At least for me, any power supply that does this goes off the bench immediately. The right solution to this problem is to go backwards and figure out why the hell it does this in the first place, and correct the design. Is this a linear or switching supply?
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