Problem Statement
I’m continuously using all of my wall outlets to plug-in a USB wall wart power supply to use for all of my development boards (e.g. Raspberry Pi, Arduino, etc). Over time I needed two 6 port power strips just to have enough outlets for the USB wall wart. To address this issue, I designed a very simple 15 Power USB power supply using an ATX Power Supply.
Introduction
This design is a passive USB power supply, meaning this design directly connects the ATX Power Supply +5DCV directly to the +5DCV pin of a USB connector. I was considering adding a USB charging port controller and current limiting power switch such as the TSP2511. But I wanted to keep this design simple.
Parts List
Name | Description | Distrubutor | Price | URL |
---|---|---|---|---|
USB Connector | 3 Stack USB | Mouser | $4.24 | Link |
Binding Post | For the power supply | Sparkfun | $0.35 | Link |
Fuse Holder | Fuse Clip 5mm | Sparkfun | $0.25 | Link |
PCB | 15 Port USB | DirtyPCBs | $25 | Link |
Assembly
PCB Layout Design
I had an old ATX Power Supply, so I just used this one. This ATX Power Supply cost around $15 on Amazon.com
This is the ATX Power Supply with the cover off. As you can see, there is room in this ATX Power Supply to fit the PCB.
This design doesn't use an ATX connect to save money on the BOM. So I trimmed the wires to the desired length.
Solder the ATX wires to the designated power rail of the PCB. The voltage is labeled on the silkscreen.
Modified the ATX Power Supply, so the PCB can be mounted
Fully assembled 15 Port USB Power Supply.