Systems, methods and apparatus for guidance and alignment between electric vehicles and wireless charging systems

An apparatus for determining a relative position of a wireless power transmitter from a wireless power receiver, comprising:

• a plurality of magnetic sense coils, each configured to generate a respective voltage signal under influence of a first alternating magnetic field and a second alternating magnetic field, the first alternating magnetic field oscillating at a first frequency and a second frequency separated from the first frequency by a first frequency spacing and the second alternating magnetic field oscillating at a third frequency that is separated from the second frequency by a second frequency spacing that is equal to the first frequency spacing;
• and
• a processor configured to determine the relative position of the wireless power transmitter from the wireless power receiver based on the respective voltage signal from each of the plurality of magnetic sense coils.

A method for determining a relative position of a wireless power transmitter from a wireless power receiver, comprising:

• generating a respective voltage signal by each of a plurality of magnetic sense coils Under influence of a first alternating magnetic field oscillating at a first frequency and a second frequency separated from the first frequency by a first frequency spacing and a second alternating magnetic field oscillating at a third frequency that is separated from the second frequency by a second frequency spacing that is equal to the first frequency spacing;
• and
• determining the relative position of the wireless power transmitter from the wireless power receiver based on the respective voltage signal from each of the plurality of magnetic sense coils.