Multiphase voltage regulator having coupled inductors with reduced winding resistance

A multiphase voltage converter, comprising:

• 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.

A multiphase voltage converter, comprising:

• 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.