Hello.
There is bench power supply sitting on my desk, delivering up to 5A and 30 V. Now I would like to have a device which turns the voltage provided by the supply into positive and negative rails, 50/50. If I put 10 V in, I would expect -5, common ground and +5V from it. If I crank up the supply to 20V, I expect -10, com and +10V. I would love to have up to 2A. At the same time I would like to use the built-in over current protection from my supply.
Now, is it possible to do that? I dislike voltage dividers based on resistors. I am quite experienced in microcontroller stuff, so even an active solution would be welcome. I don't mind sourcing some parts, etching a pcb and do some solder stuff. Some electronics knowledge is available. But I lack the knowledge of coming up with the electronic circuit on my own, or even an idea on how to do it. I don't even the correct term for what I am looking for.
In my dreams I have a box containing the circuit, 2 banana plugs to receive the input dc from the existing supply, and 3 binding posts providing the voltage for negative and positive, and the common ground. The whole control stuff could happen by cranking up and down the voltage of the power supply, and using its OCP.
Yes, I could spend some good money and buy a proper bench power supply. But it is just a hobby, and I do not need this negative rail very often, a few times a year. I do not care about a little noise such a circuit might create. At the same time, if there was a ready built device I could use, might be this could be a solution as well.
Can anyone help with some input? If the description is not good enough I will try my best to add to this.
Oh, and due the design of the power supply, buying another one and put them in series seems to be no option, since it is not "floating" as far as I understood.
Regards,
Peter