Hello, I am working on a system where a laser does something and then there is a lot of wasted laser radiation. I want to capture this waste radiation in a small array of solar cells then feed the resulting current back into the laser to make it more efficient. The output from the solar cells will be put through a switching DC-DC converter to match the lasers input voltage requirements. Now I will have two power supplies: the output from the switching converter that is the right voltage but with insufficient current to power the laser, and another to supply the rest of the current. My Question: I know I can't just hook these two power supplies up in parallel, so how do I connect them so that all of the Solar power goes into the laser and the rest comes from the main power supply? Is there some kind of charge controller IC or something I can buy? (I do not want to use a battery). Thanks so much for your help!