This article was created from a community discussion by @jtan .
Using Power Delivery pass-through with a supported USB-C laptop, you can power the laptop and the multiport adapter/hub with your existing USB-C laptop power adapter. To ensure the hub powers and charges your laptop, your host laptop’s USB-C port must support USB Power Delivery. An existing USB-C laptop power adapter is plugged into the hub, which then “passes through” power to charge the laptop over the single USB-C connection.
Reserved Power
With most multiport adapters/hubs, some amount of power (commonly between 4W and 15W, depending on I/O) is reserved for hub/downstream ports. This means if a hub like our HB30C4AFPD (that reserves 7.4W) is used with a 60W USB-C power adapter, only 52.6W will be provided to the laptop via PD Passthrough.
Host USB-C Ports Without USB PD Support
Not all USB-C ports support the full functionality of the USB Type-C standard. Multiport adapters/hubs can connect to a host laptop’s USB-C port that doesn’t support USB Power Delivery. However, in this configuration, if a power adapter is connected to the multiport adapter/hub, it will not pass power through to the host laptop.
This FAQ applies to these products: CDP2DVIUCP CDP2DVIUCPW CDP2HDUACP CDP2HDUACPW CDP2HDUCP CDP2HDUCPW CDP2VGAUACP CDP2VGAUCP CDP2VGAUCPW HB30C3AGEPD HB30C4AFPD US1GC301AU US1GC303APD US1GC30PD CDP2HVGUASPD 115B-USBC-MULTIPORT 120B-USBC-MULTIPORT 122-USBC-HDMI-4K-VGA 127B-USBC-MULTIPORT CDP2HVGUASPD CDP2HVGUASPD DKT31CH2CPD3 102B-USBC-MULTIPORT HB31CM4CPD3 DKT31CMDPHPD