I'm curious if anyone has actually attempted to parallel multiple power supplies in a do-it-yourself project to achieve higher current output, rather than just investing in a single higher current supply. I've heard that it can be done theoretically using diodes or ideal diode circuits, but I'm interested to know if anyone has real-world experience with this. Also, how about using different supplies in parallel for redundancy, often referred to as power ORing?
3 Answers
I work with redundancy in networking products for mission-critical needs. I provide some options like sharing current or letting the highest voltage take priority. While it’s not really DIY considering I designed it myself, it showcases the principles. Just make sure the outputs are as close in voltage as possible for best results!
Generally, paralleling power supplies to increase current can be pretty tricky unless they're specifically designed for that purpose. In my case, I have a dual output bench power supply that allows you to switch the outputs from independent to parallel or series mode, which is pretty handy. For redundancy, linking power sources in setups like battery-backed security systems isn't uncommon either!
If you're looking to parallel supplies, you can do it safely if they match closely in current and voltage. Using Schottky diodes can really help here since they have a lower voltage drop. Just tie the positive outputs with the diodes and connect the negatives directly. Just remember, if the supplies have sense inputs, handle those appropriately too!