Apparatus and methods for reducing magnetic field emissions between wireless power transmitters

A method for providing wireless power, the method comprising:

• communicating with wireless power transmitter and a second wireless power transmitter;
• identifying a first frequency of a first current provided to the first wireless power transmitter, the first current generating a first magnetic field at a first level sufficient to power or charge a first device;
• determining a second frequency at which to provide a second current to the second wireless power transmitter such that a frequency difference between the first frequency and the second frequency reduces a magnitude of a combined magnetic field of the first and second magnetic fields in a region between the first and second wireless power transmitters;
• and
• providing the second current to the second wireless power transmitter at the second frequency.

An apparatus for providing wireless power, the apparatus comprising:

• means for communicating with wireless power transmitter and a second wireless power transmitter;
• and
• means for identifying a first frequency of a first current provided to the first wireless power transmitter, the first current generating a first magnetic field at a first level sufficient to power or charge a first device;
• means for determining a second frequency at which to provide the second current to the second wireless power transmitter such that a frequency difference between the first frequency and the second frequency reduces a magnitude of a combined magnetic field of the first and second magnetic fields in a region between the first and second wireless power transmitters;
• means for providing the second current to the second wireless power transmitter at the second frequency.

A non-transitory computer readable storage medium comprising instructions that when executed cause a processor to perform a method for wirelessly transmitting power, comprising:

• communicating with wireless power transmitter and a second wireless power transmitter;
• identifying a first phase of a first current provided to the first wireless power transmitter, the first current generating a first magnetic field at a first level sufficient to power or charge a first device;
• determining a second frequency at which to provide a second current to the second wireless power transmitter such that a frequency difference between the first frequency and the second frequency reduces a magnitude of a combined magnetic field of the first and second magnetic fields in a region between the first and second wireless power transmitters;
• providing the second current to the second wireless power transmitter at the second frequency;
• and
• monitoring temperature of the first wireless power transmitter.