Patent DE-102010014281-A1 (DE)
Title: Inductive electronic module useful in current divider device, comprises a core element having an inner limb and two lateral limbs, where the core element is provided with windings for forming a transformer
Inventor: GRUBER STEPHAN
IPC: H01F27/42
Filed: 2010-04-08
Abstract: The inductive electronic module comprises a core element having an inner limb (12) and two lateral limbs (14, 16) associated to the inner limb on both sides, where the core element is provided with four windings (N1, N2, N3, N4) for forming a transformer. The first winding is implemented as a series connection composed of two partial windings. The first partial winding is formed on a first lateral limb, and a second partial winding is formed on a second lateral limb. The first and the second partial windings have a number of turns and a direction of turn. The inductive electronic module comprises a core element having an inner limb (12) and two lateral limbs (14, 16) associated to the inner limb on both sides, where the core element is provided with four windings (N1, N2, N3, N4) for forming a transformer. The first winding is implemented as a series connection composed of two partial windings. The first partial winding is formed on a first lateral limb, and a second partial winding is formed on a second lateral limb. The first and the second partial windings have a number of turns and a direction of turn, which are designed such that a resulting magnetic flow of the first winding is cancelled in the inner limb, and is zero, and a second winding is formed on the inner limb. The first and/or second windings comprise two conductors, which are contacted separately from one another for implementing the transformer that is magnetically decoupled from the other windings respectively. The first and the second winding are arranged as a conducting path on a printed circuit board, which has openings or recesses for the section of the core element releasing the limb for magnetic co-operation with core element. Two conductors are parallely guided to the first and/or the second winding in section-wise manner and/or guided concentrically passing on a common printed circuit board for reaching a magnetic coupling with each other. The printed circuit board is a multilayer structure for conductor path layers of the windings and/or is a part of a layer assembly of printed circuit boards. The inner limb is assigned as 2n-2 lateral limb of the common core element for implementing n transformers magnetically decoupled from the other, where n is = 4. The core element is formed so that a ratio of the magnetically effective cross-sectional area of the lateral limb to the cross-sectional area of the inner limb in n lateral limb is (2n-1):(2n-2). The transformer implemented on the interior limb with two conductors has a first division ratio and the transformer implemented on the lateral limb with two conductors has a second division ratio. The first and the second division ratio are different from one another. The core element has surface section formed for the co-operation with the printed circuit board, where elevations realizing one of the inner limbs or the lateral limbs extend by the surface section in single-piece manner. The windings extend itself over two lateral limbs provided on both sides of the inner limb and have individual contactable conductors.