I currently have a dual power supply, that supplies +/-15V. One -output of the PS is connected to the other channel's +output (GND). Now, the problem is that I need +/-50V. I bought two step-up boost converters (cheap ones from Amazon), but now I realise that I may have the wrong idea. The converters have +/- input and +/- output, and I connected the +15V from the PS into the +input of one, and -15V into the -input of the other. The unconnected inputs are grounded. Now, my idea was that one of them would give +50V (which it does), and the other -50V. Note that my +converter has its -input and -output grounded, my -converter has its +input and +output grounded.
However, the -50V is not working, and the PS keeps getting current locked. Am I connecting things wrong, or is my idea wrong?
EDIT:
Sorry for the confusing explanation. Here is a rough sketch of what I'm trying to do:
(Source)
I am using this to power a high voltage op-amp, specifically OPA454.
I'm not sure what "isolated" boost converter, but I have two of these from Amazon:
Thanks for all the help.
Best Answer
I disagree. I think your circuit can work with one minor modification...remove the connection between the +/-15V supply.
You don't mention where you're getting +/-15 from, but if it's a bench supply, the outputs are usually isolated unless you connect or ground them externally. Your -50V supply is probably trying to generate 50V over a common ground between its negative input and its negative output.
If you're using a dual supply with a common ground, you may need an additional one--and they have to be isolated from each other, which means isolated from any common inputs as well. Compared to your output ground, the -15 supply will be providing -50V on its negative terminal, and -35V on the positive.