Vertical Winding Structures for Planar Magnetic Switched-Mode Power Converters
First Claim
1. A power converter, comprising:
- a multi-layer printed circuit board (PCB) having first, center and second holes formed therethrough, said PCB having a split-primary and secondary windings formed horizontally thereon around said first and second holes;
a magnetic core having a base below said PCB, first, center and second legs on said base and extending through said respective holes in said PCB so that said split-primary and secondary windings are wound around said first and second legs, and a plate above said PCB on said first and second legs; and
a vertical inductor winding around said center leg.
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Abstract
A vertical winding structure for planar integrated magnetics used in switched-mode power converters maintains close coupling between the different windings but reduces the eddy current losses, lowers the DC winding resistance and reduces the number of layers of the PCB. Vertical and horizontal windings can be used together without sacrificing these performance advantages and further minimizing the capacitive coupling between the outer-leg windings and the center-leg winding. This winding structure can be used in a wide range of magnetic structures including isolated and non-isolated CDRs, interleaved CDRs, and buck and boost converters.
138 Citations
11 Claims
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1. A power converter, comprising:
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a multi-layer printed circuit board (PCB) having first, center and second holes formed therethrough, said PCB having a split-primary and secondary windings formed horizontally thereon around said first and second holes;
a magnetic core having a base below said PCB, first, center and second legs on said base and extending through said respective holes in said PCB so that said split-primary and secondary windings are wound around said first and second legs, and a plate above said PCB on said first and second legs; and
a vertical inductor winding around said center leg. - View Dependent Claims (2, 3, 4, 5)
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6. A power converter, comprising:
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a matrix integrated magnetic (MIM) core having a base, first, second, third and center legs on said base, and a plate opposite said base; and
a vertical winding around at least one of said first, second, third and center legs. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification