@cakyol I am also looking for a lab/bench symmetric power supply of up to +/- 100 volts DC at about 2 - 3 amps (so about 500 - 600 watts) and having a very difficult time finding it. The very rare ones I have seen are in excess of $1500. I need such a supply for testing purposes. I do not want to build one.
Does anyone know of one around a max of $500 ?
I would just buy two identical supplies, float the grounds and put them in series. Thats what I use on my bench.
You want a lot of watts, 1/2 KW. Most bench supplies are not up to that. This company made great stuff. This is getting close. www.ebay.com/itm/POWER-DESIGNS-6050A-Variable-Universal-DC-Source-AS-IS-See-Description/292803892089...
Keep looking at ebay. What you want is rather unusual due to the amount of power, heatsinks to manage the drop across the transistors. At the power level you want a linear supply is unlikely. Almost has to be a switcher to manage the losses. Imagine if you are asking for just a few volts at 3 amps. The high side of the regulator has to be above 100 volts so 300 watts are dissipated in a linear regulator. Thats a lot of heat
What I would do is just make a brute force power supply and run it from a variac. Thats what I have done when I need that much power. Its nice, no losses, no heat.
I do recall that HP made some very high power regulated supplies and handled the dissipation by tracking the regulator with the variac. Again, that is to reduce the heat dissipation. That would be a great and not too difficult project.