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US 6,307,457 B1Granted
Planar transformer
AssigneeU.S. Philips Corporation
InventorsWouter M. Wissink, Pieter J. M. Smidt, Jan W. Arets
Life of this patent
Estimating the term…
Abstract
Planar windings of the secondary coil have outward extending portions which on the outside, so that the vias are situated at a larger distance from the core. In a planar transformer, also the turns of the primary coil may extend parallel to each other. In this manner, it is possible to further reduce the size of the transformer, while the power loss is minimal.
Claims9
A planar transformer comprising:
- a plurality of insulating layers;
- a first coil formed on a first layer of said plurality of insulating layers, said first coil having a first central winding portion and a first extending portion, said first extending portion outwardly extending from said first central portion and surrounding a first via;
- and
- a second coil formed on a second layer of said plurality of insulating layers, said second coil having a second central winding portion and a second extending portion, said second extending portion outwardly extending from said second central portion and surrounding a second via;
- wherein said first via and said second via are located outside said first central winding portion and said second central winding portion, and wherein one of said first via and said second via connects said first extending portion to said second extending portion, said first coil and said second coil being located on different planes.
2 more elements
A planar transformer comprising:
- an insulating layer;
- a first coil formed on a surface of said insulating layer and having a first extending portion;
- and
- a second coil formed on said surface of said insulating layer and having a second extending portion;
- wherein said first extending portion and said second extending portion are parallel to each other and coil together in parallel to form a central winding portion.
2 more elements
Dependencies are inferred from the claim text.