MAGNETIC FIELD DETECTION APPARATUS FOR A WIRELESS POWER TRANSFER SYSTEM

摘要

A wireless power receiver (16) configured to control an electrical connection between a capture resonator (38) of a wireless power transfer system (10) and an electrical load (18), such as a battery pack or electric motor. The circuitry of the wireless power receiver (16) is powered directly by the power output from the capture resonator (38), automatically powering up the wireless power receiver (16) as soon as the capture resonator (38) begins producing power. The wireless power receiver (16) does not require stand-by power provided by an external source, such as a vehicle battery (18). Since the wireless power receiver (16) does not require power from an external source, it can initiate charging of a vehicle battery (18) even if the state of charge of the vehicle battery (18) is too low to operate the controller (50).