Wireless charging systems with multicoil receivers

A portable electronic device that is configured to receive wireless power transmitted from an array of tiled transmitting coils in a wireless power transmitting device, wherein the tiled transmitting coils are characterized by a center-to-center spacing, the portable electronic device comprising:

• a battery;
• and
• wireless power receiving circuitry that includes an array of wireless power receiving coils and that includes rectifier circuitry that is configured to rectify alternating-current wireless power signals received by the array of wireless power receiving coils and to provide a corresponding direct-current voltage to the battery, wherein the wireless power receiving coils are laterally spaced from each other in a two-dimensional array, and wherein first, second, and third wireless power receiving coils of the array of wireless power receiving coils are respectively aligned with first, second, and third vertices of an equilateral triangle that has sides with lengths equal to half of the center-to-center spacing.