CAPACITIVELY BALANCED INDUCTIVE CHARGING COIL
First Claim
Patent Images
1. An inductive coil comprising:
- a length of electrically conductive wire forming at least one winding in a planar layer, the layer including a center point, the at least one winding comprising;
a first half of the winding; and
a second half of the winding contiguous with the first half;
wherein;
the wire crosses itself at an edge of the first and second halves.
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Abstract
An inductor coil includes a wire which is wound in alternating layers such that the surface area of the wire in each winding viewed from above or below the coil is substantially equal in each half of the coil defined by a line bisecting the center point in each layer. The layers are also wound in a serpentine fashion to balance the capacitance between layers. The substantially equal surface area of wire in each half of a coil layer and in adjacent coil layers results in a balanced capacitance of the coil which, in turn, results in reduced common mode noise.
55 Citations
20 Claims
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1. An inductive coil comprising:
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a length of electrically conductive wire forming at least one winding in a planar layer, the layer including a center point, the at least one winding comprising; a first half of the winding; and a second half of the winding contiguous with the first half;
wherein;the wire crosses itself at an edge of the first and second halves. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An inductive coil comprising:
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first and second adjacent coil layers formed from a single wire;
whereinthe first layer defines a plane bisected by a line through a center point of the plane, the line defining a first half and a second half of the at least one layer, the first layer comprises a plurality of windings made from a continuous length of wire that crosses itself; the wire forms a first winding of the at least one layer before crossing itself; and the wire forms a second winding of the at least one layer after crossing itself. - View Dependent Claims (8, 9, 10, 11)
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12. A portable electronic device comprising:
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a housing; electronic components associated with the housing; an inductive coil including a length of electrically conductive wire formed into at least one winding in a planar layer, the layer including a center point in the planar layer, each the winding including; a first portion comprising approximately one half of the winding as determined by a line through the center point parallel with the planar layer; and a second portion comprising another half of the winding in the planar layer opposite to the first portion; wherein the length of wire comprising the first portion is approximately equal to the length of wire comprising the second portion. - View Dependent Claims (13, 14, 15, 16)
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17. A method for forming an inductive coil comprising the steps of:
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operating a rotating mandrel; wrapping a wire length on the mandrel; translating the wire in conjunction with the step of wrapping to alternate the wire in adjacent layers; and forming the wrapped wire into an inductive coil. - View Dependent Claims (18, 19, 20)
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Specification