Hi,
None of the current docks will charge the notebook through USB.
However some docks can power the notebook through dedicated AC cables:
HP Universal dock
http://h30094.www3.hp.com/product/sku/10752199
Targus ACP77 dock
http://targus.com/us/universal-usb-3...ion-with-power
Targus ACP71 dock
http://targus.com/us/universal-usb-3...power-acp71usz
Thanks,
James