Electronics > Projects, Designs, and Technical Stuff
Universal PSU module - Suggestions and Ideas?
ricko_uk:
Hi,
I am thinking of making a little power supply module for whenever I need compact multiple supplies on the go and away from the lab, with the following specs:
- input 4.5 to 15V
- outputs: +/-3.3, +/-5, +/-12, + variable (trimmer set), - variable (trimmer set)
- LEDs: Power in/on and over current (for the various regulators used)
- input connector USB, DC barrel and screw terminal
- output connector pin header and screw terminal
Two questions:
1) would you add anything else?
2) which regulators configuration and regulators would you use?
Out of curiosity, is there anything already available on the market? I could only find this one which is somehow similar but delivery is Sept: https://www.amazon.co.uk/Single-Supply-Module-Regulator-Multiple/dp/B089RS1MJ8/ref=sr_1_10?dchild=1&keywords=dual+power+supply+module&qid=1596545395&sr=8-10
Thank you
Pawelr98:
Depends on how much output current you want.
Rails separate or common ground ?
Good independent regulation or rough ?
In the 100-200mA range you can go with push-pull primary and multiple secondaries.
Then LDO for proper regulation.
ricko_uk:
Thank you Pawelr98,
I am thinking about at least 500mA, preferably 1A.
All grounds common (although you now made me think that perhaps separate grounds is a better idea and then I can join them with a jumper/switch if and when needed).
Good regulation but nothing extreme. something perhaps around 0.1V regulation.
Pawelr98:
Good efficiency or medicore ?
With so many output voltages and negative/positive the push-pull configuration is something I would use.
Classic 494 or many other IC's can handle the rough regulation.
Then postregulation with LDO's that will just heat up.
Input voltage of the LDO regulator shouldn't be too high as this would cause overheating problems.
Should be simple to build. Find a core without a gap, such cores are used for Half-bridge or Forward topologies.
Wind half of the primary, then secondaries, at last second half of the primary.
With push pull configuration you want to wind bifilar primary winding in order to save time and make sure both parts are fairly similar.
Just remember to connect those primary windings the right way.
Then there's a small issue of low input voltage.
A small boost regulator should boost the input voltage for the driver.
Doesn't have to be anything fancy, it only carries small amount of power.
Mosfet transistors are going to need that higher voltage for their gates.
Unless good efficiency is required.
Then it becomes tricky.
Synchronous converters and other modern solutions.
ricko_uk:
Thank you Powelr98,
efficiency is not that important.
More important is the fact that I haven't wound transformers before and am looking for a more "standard" solution that I can just design and make with off the shelf parts. Even if it involves more parts.
Very busy so I need to make something relatively quickly and with high confidence that it works from the start and don't feel comfortable starting to wind transformer and possibly having to tune them.
For the same reason, using some (Altium) "channel" design would be also good as it would make the whole thing quite quick.
Any suggestion along those lines?
Thank you :)
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