Granted Patent B2

US 8,779,885 · App. 13/792,084 · Granted Jul 15, 2014

Inventors: Jieli Li (Fremont, CA); Charles R. Sullivan (West Lebanon, NH); Angel Gentchev (Fremont, CA)

Assignee: Volterra Semiconductor Corporation

Abstract

Claims (22)

1. A coupled inductor, comprising:

a ladder magnetic core having length and width, the ladder magnetic core including first and second rails and N rungs, N being an integer greater than one, the first and second rails extending the lengthwise direction and the N rungs joining the first and second rails in the widthwise direction, a separation distance between adjacent rungs in the lengthwise direction being greater than a separation distance between the first and second rails in the widthwise direction; and

N windings, each of the N windings wound at least partially around a respective one of the N rungs;

the N windings non-overlapping along the length and the width of the ladder magnetic core, as seen when looking cross-sectionally in the widthwise direction.

2. The coupled inductor of claim 1 , N being greater than two.

3. The coupled inductor of claim 2 , each of the N windings being a single turn winding.

4. A coupled inductor, comprising:

a magnetic core including:

opposing first and second end magnetic elements separated from each other by a first separation distance along a first axis, and

first, second and third legs disposed in a row along a second axis, the second axis being orthogonal to the first axis, the second leg being disposed between the first and third legs along the second axis, each of the legs connecting the first and second end magnetic elements along the first axis,

the first leg being separated from the second leg by a second separation distance along the second axis, the second leg being separated from the third leg by a third separation distance along the second axis, each of the second and third separation distances being greater than the first separation distance;

a first winding wound at least partially around the first leg;

a second winding wound at least partially around the second leg; and

a third winding wound at least partially around the third leg;

each of the first, second, and third windings having an u-shape, as seen when looking cross-sectionally in a direction parallel to the first axis.

5. The coupled inductor of claim 4 , each of the first, second, and third windings being a single turn winding.

6. The coupled inductor of claim 2 , each of the N windings forming only a single loop within the coupled inductor.

7. The coupled inductor of claim 6 , each of the N windings being wound around only a single respective rung of the ladder magnetic core.

8. The coupled inductor of claim 2 , the ladder magnetic core further having depth, each of the N rungs extending along substantially all of the depth of the ladder magnetic core.

9. The coupled inductor of claim 2 , each of the N windings having an u-shape, as seen when looking cross-sectionally in the widthwise direction.

10. The coupled inductor of claim 4 , each of the first, second, and third windings forming only a single loop within the coupled inductor.

11. The coupled inductor of claim 10 , each of the first, second, and third windings being wound around only a single respective leg of the magnetic core.

Assignments (1)

Continuity (10)