MAGNETIC FIELD DETECTION APPARATUS FOR A WIRELESS POWER TRANSFER SYSTEM

摘要

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

主权项

1. A wireless power receiver configured to receive an alternating magnetic field produced by a wireless power transmitter, said wireless power receiver comprising:
a capture resonator configured to produce an alternating electrical current when excited by the alternating magnetic field; a rectifier circuit electrically coupled to said capture resonator and configured to produce a direct electrical current when excited by said alternating electrical current; a controller configured to control the wireless power receiver; a voltage regulator circuit electrically coupled to the capture resonator and the controller, wherein the controller is configured to receive electrical power from the voltage regulator circuit when the capture resonator is receiving the alternating magnetic field, thereby activating the controller.