Versatile DIY USB Power Supply
This portable 100W + 65W charging unit features two USB-C Power Delivery ports, four USB-A ports, and a 24VDC output jack.
The USB-C standard presents a staggering array of possibilities, from ultra-high data transfer, to fast Power Delivery (PD) charging, and more. Actually supplying sufficient power to more than one USB-C PD port, however – plus taking care of any legacy USB-A devices – generally means using more than one wall wart, or perhaps hacks like daisy chaining devices though a notebook computer.
To take care of all his power needs on the go, electronics creator tobychui took things into his own hands, and made a DIY 100W + 65W USB charging unit, which also includes four USB-A ports and a 24VDC power jack. The device can operate with input voltages of 110-220VAC, which are internally converted to DC using a 24VDC, 9A power supply. This power is then passed on to two USB-C/A converters which take care of PD duties. This allows for dynamic USB-C power allocation, since the two converters operate separately from one another.
The device also features a buck converter that steps the 24VDC supply down to 8.5VDC to power a small cooling fan. The whole thing is well ventilated via a triangle pattern on the back, and an alternate vent arrangement on the side.
While not exactly pocket-sized, it’s definitely small enough to pack up for a Maker Faire or other mobile needs. If you want to build your own, tobychui has provided a parts list, written directions, 3D print files, and a schematic on the project writeup. Note that this kind of AC power project can be dangerous, so be sure you’re up to the task before attempting it!