Making a mega multi-port usb rapid charger? Answered
I'd like to build a usb rapid charger with a minimum of 8 ports (but the more the merrier, 16 would be ideal) that can provide a minimum of 1A per port (2A preferred for rapid charging). I'm thinking, for a smaller foot print, that I could use a 250W mini ITX power supply, but I don't know how much I can get away with putting on the 5v rail alone. I'm willing to build circuits to use the other voltage outputs if necessary, but I know very little about circuit design and would need to be able to find appropriate schematics at the least, if not actual pcb kits. Each usb needs to provide stable power, regardless of how many other devices are plugged in, for picky devices. The devices to be charged are all Samsung. If I'm not mistaken, I should be able to put them in rapid charge mode by connecting the two data lines on each port, but I'm open to suggestions, in case the charger is later used for Apple products. I plan to have a fuse for each port, perhaps 3A. Would I need a bigger fuse further upstream for the whole charging circuit? Say, 24A? Also, if any other outputs will be used besides the built in 5v, I'd like to find the most efficient means of using these, the less waste-heat produced, the better. I feel like there is probably enough information on the webs to put this together, but I'm finding conflicting info, and since the device will not always be under my direct supervision, it needs to be fool-proof and safe.
Thanks, in advance,