Inductive battery charger system with primary transfomer windings formed in a multi-layer structure
AssigneeCity University of Hong Kong
InventorShu-yuen Ron Hui
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Abstract
There is provided a planar inductive battery charging system designed to enable electronic devices to be recharged. The system includes a planar charging module having a charging surface on which a device to be recharged is placed. Within the charging module and substantially parallel to the charging surface are multiple primary windings formed in a multi-layer structure that couple energy inductively to a secondary winding formed in the device to be recharged. A winding of a first layer is offset relative to a winding of a second layer. The invention also provides secondary modules that allow the system to be used with conventional electronic devices not formed with secondary windings.
Claims29
A battery charging system comprising:
- a charging module comprising a primary charging circuit and being formed with a planar charging surface adapted to receive an electronic device to be charged, said primary charging circuit including a plurality of transformer windings formed in a multilayer structure comprising at least two layers;
- at least one of said layers comprising a plurality of primary windings, each said primary winding being substantially parallel to said planar charging surface, a winding of a first layer of said layers being offset relative to a winding of a second layer of said layers;
- wherein said primary windings are provided with electromagnetic shielding on the side of said multi-layer structure opposite from said planar charging surface;
- and
- wherein said electronic device is formed with a secondary winding.
A charging module for a battery charging system, said module comprising:
- a primary charging circuit comprising a charging surface for receiving an electronic device to be charged;
- said charging module comprising a plurality of transformer primary windings formed in a multi-layer structure comprising at least two layers;
- and
- at least one of said layers comprising a plurality of primary windings, a winding of a first layer of said layers being offset relative to a winding of a second layer of said layers.
Dependencies are inferred from the claim text.