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There are numerous designs of PSU's in this forum, search for digital controled power supply and so on. I do not know how advanced it should be but check here:
123.epemag.com I think..
I am building an old design from elektor 0-40V 0-5A, +-0-40 and 0-5A or in seriall paralell mode 0-80 and 0-10A. But the design are quite old so the modern ones are perhaps a little bit cheaper. The reason I choosethis design was that I already had some of the thyristors and diodes.