WIRELESS CHARGER WITH UNIFORM H-FIELD GENERATOR AND EMI REDUCTION

摘要

The present disclosure pertains to wireless chargers. In one embodiment, a 2×2 array of conductive coils produces magnetic fields. Adjacent coils receive current having different directions to cancel magnetic fields around a periphery of the array. A wireless charging platform may include at least four such coils. Regions between and above the coils may include magnetic fields approximately parallel to the surface of the platform so that electronic devices may be charged while standing up during operation by a user with reduced exposure to magnetic radiation. An electronic device may also be placed flat on each coil for charging.

主权项

1. A wireless charger comprising:
at least four conductive coils arranged in a two-by-two array, each conductive coil in the two-by-two array arranged to have a first adjacent conductive coil and a second adjacent conductive coil, and when a particular conductive coil comprises a first current in a first direction around the particular conductive coil, a second current in the first adjacent conductive coil is in an opposite direction than the first direction around the first adjacent conductive coil and a third current in the second adjacent conductive coil is in the opposite direction than the first direction around the second adjacent conductive coil.