Wireless battery charging system that maintains the desired voltage-current phase relationship by varying the frequency of the magnetic field

摘要

The charging system (12) is configured to wirelessly charge an energy storage device (14), such as a battery (14). The charging system (12) includes an off-vehicle transducer (18) that is in electrical communication with an alternating current power source (48) and is electromagnetically coupled to an on-vehicle transducer (20) connected to an energy storage device (14). . The controller (53) adjusts the variable frequency oscillator (71) in the power transmitter (16), thereby changing the frequency of the supplied power. The charging system (12) communicates with the controller (53) and the off-vehicle transducer (18) and is configured to determine the phase difference between the AC voltage and the AC current supplied by the power source (48). (72) is further provided. The controller (53) is configured to adjust the variable frequency oscillator (71) based on the phase difference so that the frequency of the supplied power maintains the phase difference within a desired range. [Selection] Figure 2