Counter wound inductive power supply

摘要

A contactless power supply is provided. The contactless power supply includes two or more primary coils for generating a region of cooperative magnetic flux generally therebetween. A portable device having a secondary coil can be positioned proximate this region of magnetic flux to receive wireless power from the contactless power supply. The spaced-apart primary coils can be wound in alternating directions about a common axis and driven in phase, or can be wound in a single direction about a common axis and driven approximately 180 degrees out of phase. The contactless power supply can include a plurality of primary coils in an adjustable array to accommodate multiple portable devices each with different secondary configurations and power consumption needs.

主权项

1. A contactless power supply for providing power to at least one remote device, comprising:
a primary coil array including more than two inductive primaries; a driving circuit adapted to selectively drive a first inductive primary of the primary coil array and a second inductive primary of the primary coil array, wherein the first inductive primary provides an electromagnetic flux when driven with a first time-varying current, the first inductive primary defining a first centerline axis; wherein the second inductive primary provides an electromagnetic flux when driven with a second time-varying current, the second inductive primary defining a second centerline axis coaxial with the first centerline axis; and a power transfer surface to receive the at least one remote device thereon, wherein the first and second inductive primaries are subjacent the power transfer surface and wherein the first and second centerline axes are generally parallel to the power transfer surface, the first and second inductive primaries being operable to define a cumulative magnetic flux in a region of the power transfer surface between the first and second inductive primaries.