I'm looking for information on OR-ing circuits.
I have a 3D printer that works well for the most part, but it is underpowered when it comes to heating the bed. I'm usually waiting about 45 minutes to an hour for the bed to heat up to 100C, and the wait is irritating me. Others with my type of printer recommend using a 24V 30A PSU and a 100A SSR to get the bed heat up time to less than 10 minutes. Unfortunately, I'm on a budget and don't want to spend the $200+ that that solution would cost.
I have a couple of cheap Chinese 24V 15A switching power supplies, but linking power supplies is a little more complicated than putting batteries in parallel. My google-fu has found some information on low voltage, low amp OR-ing circuits, but it has failed me in finding anything for higher currents and voltages.
Could someone who knows more about this subject than I (that wouldn't be hard, I've pretty much said it all in this post) point me towards more information on OR-ing design? Also, are there any cheap solutions already out there?
Thanks,
Pete