I've already made one that goes 60volt, but now have a device that needs 84 volts to the input of a BMS (battery management circuit). 90 watts -- OEM charger is 1.45 amps @84 volts.
https://www.amazon.com/gp/product/B00BZR9PBW/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 this is the 60 volt booster i've used in the past
https://www.tindie.com/products/ReclaimerLabs/usb-type-c-power-delivery-phy-breakout-board/ this is the breakout board that will pull the full 20 volts out of my macbook charger.
I plan on charging my inmotion electric unicycle - at work, without bringing the huge brick ac/dc power supply.. I will hide all the charging/ boosting circuits ( if one that big exists or can be built) inside the unit itseld, and installing a female usb-c on the unit.
I did this on my bosch electric bike,
I searched mouser and digikey- can't find anything.. Is this possible? 20volts at 90watts is what the macbook/chromebook chargers will push out when they get the proper handshake from the IC chips once you program them in terminal. enter image description here