Patent ID: 8305033

Claim:
A vehicle power system having a high voltage battery being operable to output current sufficient to power an electric motor operable to drive the vehicle; a low voltage battery being operable to output current sufficient to power one or more vehicle subsystems, the low voltage battery being unable to output current sufficient to power the electric motor; a low voltage power supply being operable to regulate current provided from the low voltage battery when in an active state and inoperable to regulate current provided from the low voltage battery when in a sleep state, the vehicle power system comprising; a on-board vehicle charger being operable to charge the high voltage battery with current provided through a cordset connected thereto, the on-board charger requiring regulated current from the low voltage power supply in order to detect connection of the cordset; a proximity detection circuit being operable to transition the low voltage power supply from the sleep state to the active state upon connection of the cordset to the on-board vehicle charger.