| Electronics > Beginners |
| Cheap chineese power supply missing short-circuit protection |
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| janoc:
These switchers are not designed to work with variable output, you could have a lots of issues with stability, regulation, parts overheating, etc. The same for PC ATX supplies. If you want a variable supply, just buy it. Getting stuff to blow up in one's face because some component was marginal already and didn't survive the changing operating conditions when you hacked it is not fun. |
| dominicM:
--- Quote from: janoc on May 13, 2018, 12:52:26 pm ---These switchers are not designed to work with variable output, you could have a lots of issues with stability, regulation, parts overheating, etc. The same for PC ATX supplies. If you want a variable supply, just buy it. Getting stuff to blow up in one's face because some component was marginal already and didn't survive the changing operating conditions when you hacked it is not fun. --- End quote --- I couldn't find a suitable variable PSU so I went the DIY route. I am following this guide which seems pretty reasonable to me: http://imajeenyus.com/electronics/20151028_smps_variable_voltage/index.shtml |
| madires:
I'd be careful with modifying such a SMPSU to support a variable voltage output. 20-30% lower or higher voltage should be possible without any issues, but more is asking for trouble with the regulation in many cases. Modifying one those extremely cheap industrial type SMPSUs is tempting and there are also tons of guides in the internet. Anyway, if you you need a cheap lab PSU then buy a cheap lab PSU. Much better than a hacked nasty surprise. |
| dominicM:
--- Quote from: madires on May 13, 2018, 01:38:41 pm ---I'd be careful with modifying such a SMPSU to support a variable voltage output. 20-30% lower or higher voltage should be possible without any issues, but more is asking for trouble with the regulation in many cases. Modifying one those extremely cheap industrial type SMPSUs is tempting and there are also tons of guides in the internet. Anyway, if you you need a cheap lab PSU then buy a cheap lab PSU. Much better than a hacked nasty surprise. --- End quote --- I already said that I have a linear bench supply. This mod would be for non-voltage sensitive semi-temporary uses. Things like powering led strips or electrolysis rust removal etc... That guide seems to have tested it reasonably well so unless there is something specifically wrong with that guide it seems safe enough. That's assuming the reference design with no missing components though... |
| madires:
A lot of assumptions >:D Please ask some SMPSU greybeard to explain the issues (I'm ain't one). |
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