Multiphase voltage regulator having coupled inductors with reduced winding resistance
First Claim
1. A multiphase buck or boost or buck-boost converter, comprising:
- a magnetic core having a ladder structure comprising first and second side rails which are approximately parallel and first and second connecting rungs wherein said side rails and rungs substantially define a plane, said magnetic core comprising not more than two pieces;
a first inductor extending principally in a direction parallel to said plane and passing under the first side rail, only once over the first rung, and under the second side rail; and
a second inductor extending principally in a direction parallel to said plane and passing under the first side rail, only once over the second rung, and under the second side rail.
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Accused Products
Abstract
A multiple phase buck converter or boost converter, or buck-boost converter has an inductor in each phase. The inductors are inversely coupled. In a first embodiment, the converter includes a toroidal magnetic core with inductors extending under and over opposite sides of the toroidal magnetic core. The coupled inductors are thereby inversely coupled and have a relatively low ohmic resistance. In a second embodiment, the converter comprises a ladder-shaped magnetic core (i.e. having parallel sides, and connecting rungs). In this case, the inductors extend under the sides, and over the rungs. Each inductor is disposed over a separate rung. The ladder-shaped magnetic core is preferably disposed flat on a circuit board. Inverse coupling and low ohmic resistance are also provided in the second embodiment having the ladder structure.
150 Citations
9 Claims
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1. A multiphase buck or boost or buck-boost converter, comprising:
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a magnetic core having a ladder structure comprising first and second side rails which are approximately parallel and first and second connecting rungs wherein said side rails and rungs substantially define a plane, said magnetic core comprising not more than two pieces; a first inductor extending principally in a direction parallel to said plane and passing under the first side rail, only once over the first rung, and under the second side rail; and a second inductor extending principally in a direction parallel to said plane and passing under the first side rail, only once over the second rung, and under the second side rail. - View Dependent Claims (2, 3, 4, 5)
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6. A multiphase voltage converter, comprising:
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a magnetic core having a ladder structure comprising a first side rail and a second side rail approximately parallel to the first side rail, a first rung and a second rung connecting said first and second side rails, said first and second side rails and said first and second rungs substantially defining a plane, said magnetic core comprising not more than two pieces; a first inductor extending under the first side rail, extending only once over the first rung, and extending under the second side rail, said first inductor extending principally in a direction parallel to said plane; and a second inductor extending under the first side rail, extending only once over the second rung, and extending under the second side rail, said second inductor extending principally in a direction parallel to said plane. - View Dependent Claims (7)
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8. A multiphase voltage converter, comprising:
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a magnetic core comprising not more than two pieces having a ladder structure comprising a first side rail and a second side rail approximately parallel to the first side rail, a first rung connecting said first and second side rails, and a second rung connecting said first and second side rails, said first and second side rails and said first and second rungs substantially defining a plane; a first inductor, said first inductor extending principally in a direction parallel to said plane, coupled to the first side rail by only an approximately straight conductor, to the first rung by only a winding section having less than one winding of a conductor, and to the second side rail only an approximately straight conductor; and a second inductor, said second inductor extending principally in a direction parallel to said plane, coupled to the first side rail by only an approximately straight conductor, to the second rung by only a winding section having less than one winding of a conductor, and to the second side rail by only an approximately straight conductor. - View Dependent Claims (9)
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Specification