Wireless Battery Charging System Varying Magnetic Field Frequency To Maintain A Desired Voltage-Current Phase Relationship

摘要

An electrical charging system configured to wirelessly charge an energy storage device, such as a battery. The charging system includes an off-transducer in electrical communication with an alternating power source and electromagnetically coupled to an on-vehicle transducer connected to the energy storage device. A controller adjusts a variable frequency oscillator within the power transmitter, thereby changing the frequency of the sourced electrical power. The charging system further includes a phase detection circuit in communication with the controller and the off-transducer and configured to determine a phase difference between the alternating voltage and the alternating current supplied by the power source. The controller is configured to adjust the variable frequency oscillator based on the phase difference such that the frequency of the sourced electrical power maintains the phase difference within a desired range.

主权项

1. An electrical charging system configured to wirelessly charge an energy storage device, said system comprising:
an electrical power transmitter including a variable frequency oscillator configured to source electrical power having an alternating current, an alternating voltage, and a frequency; a controller operable to adjust the variable frequency oscillator, thereby changing the frequency of the sourced electrical power; an off-transducer in electrical communication with the electrical power transmitter, configured to be electromagnetically coupled to an on-vehicle transducer that is in electrical communication with said energy storage device, thereby inducing the on-vehicle transducer to capture electrical power to charge the energy storage device; and a phase detection circuit in communication with the controller and the off-transducer and configured to determine a phase difference between the alternating voltage and the alternating current, wherein the controller is configured to adjust the variable frequency oscillator based on the phase difference such that the frequency of the sourced electrical power maintains the phase difference within a desired range.