Inductive electronic module and use thereof
An inductive electronic module, comprising a core element having an inner limb ( 12; 29 a ) and at least two lateral limbs ( 14, 16; 33 a , 35 a ; 37 a , 39 a ) associated the inner limb on both sides, the core element being provided with windings (N 1 , N 2 , N 3 , N 4 ) for forming a transformer. A first winding (N 1 , N 2: 47, 49; 51, 53 ) is implemented as a series connection composed of two partial windings. A first partial winding is formed on a first lateral limb, and a second partial winding is formed on a second lateral limb.
1. An inductive electronic module comprising:
a core element having an inner limb ( 12 ; 29 a ) and at least two lateral limbs ( 14 , 16 ; 33 a , 35 a ; 37 a , 39 a ) associated with the inner limb on both sides, said core element being provided with windings (N 1 , N 2 , N 3 , N 4 ) for forming a transformer,
wherein a first winding (N 1 , N 2 ; 47 , 49 ; 51 , 53 ) is implemented as a series connection composed of two partial windings, of which 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 in particular is zero,
and a second winding (N 3 ; 40 , 42 ) is formed on the inner limb,
wherein, in order to implement a transformer that is magnetically decoupled from the other windings respectively, the first and/or the second windings comprise at least two conductors which can be contacted separately from one another, characterised by a fourth winding (N 4 ) which extends across two lateral limbs provided on both sides of the inner limb.
2. Module according to claim 1 , wherein the first and the second winding are formed as conductor tracks on at least one circuit board ( 31 ; 44 ) comprising breakthroughs ( 33 , 35 , 37 , 39 ; 47 , 49 , 51 , 53 ) and/or recesses for the sections of the core element implementing the limbs.
3. Module according to claim 2 , wherein at least two conductors of the first and/or the second winding are traced together, at least in sections, extending in parallel and/or concentrically, on a common circuit board for achieving a magnetic coupling.
4. Module according to claim 3 , wherein the circuit board is designed as a multilayer structure for a plurality of conductor track layers of the windings and/or is part of a stacked arrangement of a plurality of circuit boards.
5. Module according to claim 1 , wherein, in order to implement n respectively magnetically independent and/or decoupled transformers, 2n−2 lateral limbs of the common core element are associated with the inner limb, wherein n is a natural number ≧2 and ≦12.
6. Module according to claim 1 , wherein the core element is designed in such a way that a ratio of the magnetically effective cross-sectional area of one of the lateral limbs relative to the cross-sectional area of the inner limb for n lateral limbs is at least (2n−1):(2n−2).
7. Module according to claim 1 , wherein a transformer implemented on the inner limb with at least two conductors has a first dividing ratio,
a transformer implemented on two of the lateral limbs with at least two conductors has a second dividing ratio and the first and second dividing ratios are established independently of one another and are different from one another.
8. Module according to claim 1 , wherein the core element comprises a planar-shaped areal section for cooperating with a circuit board, from which areal section at least one moulded-on one-piece projection ( 33 a , 35 a , 37 a , 39 a , 29 a ) extends.
9. Module according to claim 1 , wherein the fourth winding (N 4 ) comprises a plurality of individually contactable conductors.
10. Module according to claim 1 , wherein the fourth winding is not wound around the inner limb.
11. Module according to claim 1 , wherein the transformer is a power transformer.