I have a location with two power feeds. The environment / requirements will have each power feed shut down for a short period on a regular basis. The other equipment has dual power supply and can tolerate this.
What I want to do is link two power supplies (one off each mains) so that the APU will never lose power.
Yes, In another environment I might use a UPS (single point of failure) on one power supply... or a power transfer switch to power the 12V adapter for the APU.
That is not practical in this case. I have two AC outlets - only one of them MAY be working or both of them could be working.
I understand that there are ways of paralleling switchign supplies but that normally involves sharing a sense wire, and having supplies that are designed for it - that's normally required in scenarios where you are using N+1 DC power. That's a bit overkill for what I have in mind.
I would like to join them using a method similar to this... on each supply, I'd use a diode in serieis with a low ohm resistor to prevent backflow and limit current if there is any voltage differential in the supplies.
Considering I'm not looking to "double my current" or otherwise bond the supplies and that this is intended for reliability, does anyone with hardware or power systems design have any input perhaps on the proper resistence?
Maybe someone else has done something similar?
Basically with ascii art...
PS2 -----|>|----R2----/ ------> APU POWER
Anyone willing to throw their two cents in? :-)
Thank you in advance.