Patent ID: 9741486
Date: 2017-08-22
CPC Classifications: H01F,H02M

Claim:
1. A differential mode and common mode choke comprising: a ferromagnetic core comprising three branches extending between a bottom part and a top part, said three branches comprising a first lateral branch, a second lateral branch, and a central branch; a first coil wound around the first lateral branch; and a second coil wound around the second lateral branch, wherein the first lateral branch is separated from the top part by a first air gap and from the bottom part by a second air gap, the second lateral branch is separated from the top part by a third air gap and from the bottom part by a fourth air gap, the central branch does not support a coil and is separated from the top part by a fifth air gap and from the bottom part by a sixth air gap, the first lateral branch and the second lateral branch are of a same size, and the central branch, which does not support a coil and which is separated from the top part by the fifth air gap and from the bottom part by the sixth air gap, is of a different size from the size of the first lateral branch and the second lateral branch, said first coil has a first inductance value, said second coil has a second inductance value, equal to the first inductance value, a differential mode magnetic flux passes through the top part, the second lateral branch, the bottom part, and the first lateral branch, and a common mode magnetic flux circulates through each of the first lateral branch and the second lateral branch, toward the central branch by passing through the top part and the bottom part, and the first coil and the second coil is arranged to uncouple a common mode inductance value from a differential mode inductance value.