EP2565882A1 - Inductive electronic subassembly and use of same - Google Patents

Abstract

The inductive electronic module has a planar core element having inner limbs (29a,55a) comprising lateral limbs (33a,35a,37a,39a) on either sides. The inner limb has a primary core section that is arranged for interacting with planar primary winding arrangement (TR1-A), and secondary core section that is provided spaced from primary core section and is arranged for interacting with an additional planar winding arrangement (C1). The secondary core section is arranged for implementing magnetically active air gap for additional planar winding arrangement.

Description

The present invention relates to an inductive electronic assembly according to the preamble of the main claim. Furthermore, the present invention relates to the use of such an inductive subassembly in a current divider device, in particular in conjunction with a resonant converter topology.

A generic inductive electronic module is from the WO 2011/047819 known. This prior art document discloses an inductive electronic subassembly for implementing a multiple transformer arrangement, with which, as in accordance with Fig. 4 this generic WO 2011/047819 , a current divider device for applying a plurality of consumers can be realized. In this case, this prior art advantageously provides a planar core element, which, connected in pairs with a planar windings supporting circuit board, can realize a plurality of magnetically decoupled from each other transformers in manufacturing technology simple and magnetically very efficient manner.

In particular, the document cited in the genus-forming prior art describes the possibility of allowing respective winding arrangements realizing the transformers to cooperate with the inner limb or side limbs in such a way that, within the compact geometry, this is realized by means of a pair of planar planar core elements. four and more mutually magnetically decoupled transformers can be set up.

In particular, the embodiment of the generic circuit board as a multilayer or stacked arrangement of a plurality of each planar windings supporting printed circuit boards with suitable adapted to the projections of the planar-core element pair breakthroughs supports the realization of a correspondingly compact design.

However, an embodiment of a multi-transformer arrangement that can be implemented using this known technology is required, for example in accordance with FIG Fig. 4 the generic WO 2011/047819 disclosed power divider circuit, in a resonant converter topology additional effort to the primary side of the main transformer (TR1 in Fig. 4 of the WO 2011/047819 ) additionally required for the resonant converter and in series with (in the Fig. 4 not shown) primary winding switched series or resonance inductance to realize. Is about a circuit of in Fig. 4 sketched using a generic planar core element ( Fig. 6 of the WO 2011/047819 ), while all the transformers TR1, TR2, TR4, TR5 can be implemented on this planar core element (or a pair of these planar planar core elements), another additional inductance as required for the resonant converter topology would have none Place and would require additional component cost (or the provision of additional side legs, which in turn impairs the compactness of the arrangement or means additional effort).

Object of the present invention is therefore to design a generic inductive electronic assembly and further develop that within the existing dimensions or peripheral contour of the planar core element and in particular without the need for additional external components or assemblies for a primary-side series or Resonanzinduktivität to realize a resonant converter, the implementation of such a topology using the inductive electronic assembly is possible. In particular, the same external dimensions, as possible for the generic state of the art, be feasible and not be exceeded.

The object is achieved by the inductive electronic module having the features of the main claim. Furthermore, in the context of the present invention, protection is claimed for the use of such an inductive electronic subassembly for a current divider device and / or for the realization of a resonant converter with a plurality of transformers which are mounted on the planar core element according to the invention (or a core element realized therefrom). Pair) are provided.

In accordance with the invention advantageously and in further development or departure from the generic state of the art (wherein, both with regard to the specific geometric and magnetic configuration of printed circuit board (s) and core element, as well as the power divider circuit realized therewith, the content of WO 2011/047819 is considered to be included in the present disclosure in the present disclosure), the inner leg for the realization of two core sections is formed, which, according to the generic state of the art, the first core portion of the inner leg (as before) for the implementation of about the input side (main) transformer a resonant converter cooperates with the second planar winding arrangement and now the inner leg complementary to the second core portion, spaced from the first core portion, however, still arranged between the mutually associated side legs, the realization of the series (series) or resonance inductance allows.

Although this embodiment of the inner leg (for the realization of the input-side transformer on the one hand and the associated primary-side series or resonance inductance on the other hand) does not lead to a magnetic decoupling of these winding arrangements; However, according to the resonant converter topology, in any case, the series or Resonanzinduktivität in series with the primary winding of the input side transformer (implemented as a second planar winding arrangement according to the invention) is connected, insofar as the corresponding signals are synchronous, this is magnetically harmless.

In the context of the invention, the measure according to the invention of configuring the second core section to realize an air gap ensures that the series or resonant inductance formed thereon can properly perform its task as an energy store and no magnetic saturation effects affect the primary side of the input transformer.

Thus, according to the invention advantageously and without the need to increase the planar core element geometrically or supplement by further discrete components, the required for the realization of the resonant converter series or Resonanzinduktivität be additionally housed within the arrangement and thereby also the assembly and Large-scale advantages of the generic technology are used.

In the realization of the present invention, it is particularly preferred to design the (at least one) printed circuit board carrying the planar windings by means of suitable breakthroughs such that in the manner of planar transformer arrangements (otherwise known) the pair may be connected on both sides on the circuit board cross-planar planar elements with respective projections ("surveys" within the meaning of the invention) can engage in these openings of the circuit board.

Touch now by appropriate design of these surveys, the respective planar core elements each other in such a breakthrough, a gap-free core area is realized, while about flatter elevations of the respective planar core elements of the successive pair allow the formation of an air gap in the circuit board breakthrough. This is according to the invention preferably the case for the realization of the series or resonance inductance in the primary circuit of the input-side transformer (wherein the additional planar winding arrangement realizes this series or Resonanzinduktivität with working air gap, such as the associated primary winding, realized by the second planar winding arrangement and implemented in conjunction with the first core section on the inner leg, as well as the other transformers on the side legs, air gap free).

While it is favorable and preferred in the context of the present invention to use the resonant converter topology in the use for the realization of a current divider device, which, according to a suitably chosen cascading of transformers and to realize the in the WO 2011/047817 ausgestaltetbar type, the present invention is not limited to this use or this form of realization. Rather, it allows the invention in a surprisingly simple and elegant way, in a multiple transformer arrangement on a common planar core element (or a core element pair formed therefrom) in magnetic decoupling or independence of this plurality of transformers in addition, by division of the invention Inner leg in a first and a second core portion to implement the additional series or resonance inductance.

Accordingly, the present invention makes the advancement of the generic technology without additional component cost is required, and without an external geometry must be changed or about additional side legs are provided.

Fig. 1

eine Perspektivdarstellung eines Planar-Kernelements (als Hälfte eines Paares) gemäß einem ersten Ausführungsbeispiel der Erfindung;

Fig. 2

eine schematische Kontur einer mit dem PlanarKernelement der Fig. 1 zusammenwirkenden Leiterplatte gemäß dem gezeigten ersten Ausführungsbeispiel;

Fig. 3

ein Schaltbild zur Realisierung einer vier-zweigigen Stromteiler-Vorrichtung mit vier voneinander entkoppelten Transformatoren, realisiert auf der Anordnung aus Leiterplatte und Kernelement(en) gemäß Fig. 1, Fig. 2, in Resonanzwandler-Topologie mit primärseitig des Eingangstransformators zusätzlich in Reihe geschalteter Reihenbzw. Resonanzinduktivität und

Fig. 4 - Fig. 7

exemplarische Ansichten von Leiterschichten (Wicklungslagen) einer Multilayer-Leiterplatte gemäß Fig. 2 zur Realisierung der Schaltung gemäß Fig. 3.

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments of the invention and with reference to the figures; these show in:

Fig. 1

a perspective view of a planar core element (as a half of a pair) according to a first embodiment of the invention;

Fig. 2

a schematic contour one with the PlanarKernelement the Fig. 1 cooperating printed circuit board according to the first embodiment shown;

Fig. 3

a circuit diagram for the realization of a four-branched current divider device with four mutually decoupled transformers, realized on the arrangement of printed circuit board and core element (s) according to Fig. 1, Fig. 2 , in resonant converter topology with series-connected in series on the primary side of the input transformer. Resonance inductance and

Fig. 4 - Fig. 7

Exemplary views of conductor layers (winding layers) of a multilayer printed circuit board according to Fig. 2 for the realization of the circuit according to Fig. 3 ,

The Figures 1 and 2 illustrate in the schematic representation of a possibility of realization of the inductive electronic assembly according to the invention according to a first embodiment of the invention. This corresponds to in Fig. 1 in plan view, the planar core element according to the core element Fig. 6 the generic, pre-published WO 2001/047819 (So that for identical or corresponding sections or components corresponding reference numerals and with regard to disclosure according to the invention as well as to the feasibility on the Fig. 6 and the associated description), with the proviso that the generic inner leg (reference numeral 29a in Fig. 6 of the WO 2011/047819 ) is reduced and additionally in the central region between the side legs 33a, 35a and 37a, 39a, a core portion 55a (as the second core portion according to the invention), spaced from the first core portion 29a, is formed out of the one-piece ferrite element. Specifically, the integrally formed from the ferrite material of the planar core element of Fig. 1 formed out elevations 33a, 35a, 37a, 39a with a respective opposing corresponding partner, the side legs, while, for the realization of the inner leg, the elevations 29a and 55a are configured as the first and second core portion. As well as the presentation of the Fig. 1 can recognize the elevation 55 a relative to the elevation 29 a has a lower height (relative to the planar body portion of the core member), so that when facing each other pair of planar core elements of Fig. 1 the opposite elevations 29a touch each other end, insofar as a continuous ferrite leg is formed, while, due to the lower height, between the successive elevations 55a in the manner intended according to the invention an air gap remains.

As the Fig. 2 In addition, it can be seen, the corresponding to the elevations breakthroughs 33 - 39 and 29, 55 adapted to the contours of the associated surveys.

The arrangement of planar core element (pair) and printed circuit board designed in this way then makes it possible, for example, to realize a circuit with four magnetically decoupled transformers, such as a current-controlled resonant converter with four outputs (CH1-CH4) Fig. 3 is shown. Secondary side of transformer unit TR1 ("main transformer") as an input-side transformer corresponds to the circuit in the generic state of the art WO 2011/047819 , there Fig. 4 , For the simplified concordance, the reference numerals correspond to each other and to complement the explanation of the functionality of this current divider circuit for to be connected to the outputs CHi consumers both to the explanations in the WO 2001/047819 . Fig. 4 , is referred to, as well as further to the circuit principle and its operation on the WO 2011/047817 , there in particular the corresponding one Fig. 4 , Corresponding circuit descriptions and further explanations of this operating principle are intended equally with regard to Fig. 3 of the present application as being included in the present disclosure (as belonging to the invention).

In addition, the in Fig. 3 1, shown symbolically and simplified to the switches T1, T2, a coupling capacitor C1 and a "leakage inductance" referred to as a function group realized in the resonant converter topology series or Resonanzinduktivität L1.

The present invention makes it possible, by means of the second core section 55a, to realize this series or resonant inductance L1 in the context of the core element printed circuit board arrangement of FIG Fig. 1, Fig. 2 in that, in series with the planar winding arrangement formed on the first core section 29a for realizing the transformer TR1, this additional inductance L2 is provided on the adjacent second core section 55a (and correspondingly as a planar winding on the circuit board of FIG Fig. 1 is trained). Since L1 is supplied with a signal synchronous to the transformer TR1 (as a functionality of the resonant converter topology), it is not necessary that those on the second Core portion 55 a formed planar winding assembly is magnetically decoupled from the planar winding assembly of the first core portion 29. In that regard, the present invention advantageously allows, in departure from the already in the WO 2011/047817 As described by the Applicant, not additional side legs need to be provided for realizing further magnetic decoupling.

Since, caused by the lower elevation of the protrusion 55a, the pair of planar planar core elements at the transition between the facing peaks 55a creates an air gap, the magnetic resistance of the series inductance L1 is correspondingly high (compared to the other legs 29a, 33a, 35a) , 37a and 39a with associated windings), accordingly the influence of all other magnetic assemblies provided on the unit on L1 becomes negligible. Also, L1 itself does not affect the windings on the outer legs (33a, 35a, 37a, 39a), so that insofar as the principle of the invention WO 2011/047817 such as WO 2011/047819 with regard to magnetic decoupling. Even the influence on the main transformer TR1 on legs 29a is small because the signals flowing through the series circuit are synchronous with each other and the leg (first core portion) 29a itself has no air gap (and hence very low magnetic resistance). Thus, the flooding emanating from L1 (on the second core section 55a) for the most part falls off the high magnetic resistance of the air gap at the elevation 55a. The core portion 29a need only have sufficient cross-sectional area to accommodate the additional magnetic flux portion of L1 in that portion of the core member to prevent magnetic saturation. The same applies to the lateral elevations (lateral limbs) 33a, 35a, 37a, 39a - these too must offer an enlarged cross section with regard to the flux contribution of L1 (in the practical approximation this leads to a

Cross-sectional enlargement of the cross-sectional areas in the side leg region of about 20% compared to the generic configuration, such as Fig. 6 of the WO 2011/047819 ).

A larger magnetic path length of projection 55a to the projections 35a and 39a relative to the projections 33a and 37a is compensated by the fact that a magnetic path length of projection 29a to the projections 35a and 39a in the same ratio is smaller than to the projections 33a and 37a. Since, as explained, components with synchronous signal application are located on the two inner leg core sections 29a and 55a, their different influences on the outer legs largely cancel each other out.

Based on Fig. 4-7 is a possible implementation of this inductive electronic assembly assembly and interconnection using a multilayer printed circuit board (principle contour of the Fig. 2 ). In this case, a practical implementation leads to a 1 0-layer multilayer, of which the Fig. 4-7 only four layers in sections (nevertheless describing all windings); analogous to the representation of Fig. 2 contains the Fig. 4 (thus equally for the Fig. 5-7 ) A representation of the openings 33, 35, 37, 39 and 29, 55, respectively corresponding to the elevations of the planar core element (more precisely: the pair of successive elevations of cooperating on both sides with the multilayer printed circuit board planar core element arrangement).

Specifically, that describes Fig. 4 the fourth location, the Fig. 5 the sixth location, the Fig. 6 the ninth location and the Fig. 7 the tenth layer of the multilayer printed circuit board, wherein the transformer TR1 is formed with its windings A, B, C around the aperture 29 (or the core portion 29a); the Fig. 4 shows the associated beginning of the primary winding TR1-A, while the Fig. 5 another part of the primary winding TR1-A and the bifilar to underlying connection around the opening 55 guided around end of this winding illustrates. Exemplary show the 6 and 7 together a complete secondary winding, here the winding TR1-B of the input-side transformer TR1 (with correspondingly suitable plated-through holes).

The series inductor inductor L1 is disposed around the aperture 55 (or the air gap gap pair 55a); Fig. 6 shows the beginning of this winding, Fig. 4 the winding end and the Fig. 5 the winding intermediate section.

Partial windings of the transformer TR2 are in the 4, 5 and 7 shown, in each case around two outer legs / associated openings (33, 35 and 37, 39) running around.

The Fig. 6 shows on the outer legs (or associated apertures 33, 35) partial windings of TR4, also on the outer legs (or associated openings 37, 39) partial windings of the transformer TR5.

The present invention is not limited to the specific embodiment as a multilayer printed circuit board for realizing the planar winding arrangements; Rather, other implementation options, such as by stacking a plurality of printed circuit boards or similar measures, conceivable. Also, the present invention is not limited to the realization of the magnetically decoupled four transformers; their number may be according to the doctrine of WO 2001/047817 lower or, in the case of corresponding additional side legs, also be higher, as long as the additional (second) core section according to the invention is present as part of the inner leg in the middle region.

Claims (10)

Inductive electronic assembly with
a planar core element having an inner leg (29a, 55a) and at least two side legs (33a, 35a, 37a, 39a) assigned to the inner leg on both sides,
which are assigned to form a transformer planar winding arrangements,
wherein a first of the planar winding arrangements (TR2, TR4, TR5) is realized as a series arrangement of two partial windings, of which a first partial winding is formed on a first of the side legs and a second partial winding is formed on a second of the side legs,
the first and second part-windings have a winding number and winding direction arranged to cancel, in particular 0, a resultant magnetic flux of the first planar winding arrangement in the inner leg, and a second one of the planar winding arrangements (TR1) on the inner leg of FIG the first planar winding arrangement is magnetically decoupled,
characterized in that
the inner leg has a first core portion (29a) formed to cooperate with the second planar winding assembly (TR1) and a second core portion (55a) spaced from the first core portion on the core member and adapted to cooperate with an additional series connection to the one second planar winding arrangement forming planar winding arrangement (C1) is set up,
wherein the second core portion is configured to realize a magnetically effective air gap for the additional planar winding assembly. An assembly according to claim 1, characterized in that the first core portion is formed so that it realizes an air gap-free core for the second planar winding arrangement. An assembly according to claim 1 or 2, characterized in that the first, the second and the additional planar winding arrangement are formed as conductor tracks on at least one printed circuit board, which for magnetic interaction with the core element openings and / or depressions for the leg realizing portions (33 -39, 29, 55) of the core element. An assembly according to any one of claims 1 to 3, characterized in that the preferably integrally formed core element has a co-operating with a at least one of the planar winding assemblies bearing circuit board plan trained surface portion of which the inner leg and the side legs realizing surveys (33a-39a , 29a, 55a) extend in one piece. Assembly according to claim 3 or 4, characterized in that the core element for the realization of the first core portion, a first elevation (29a) and for the realization of the second core portion a second elevation (55a) is formed, the height, relative to the surface portion, relative to the first elevation is reduced. Assembly according to one of claims 3 to 5, characterized in that a provided on both sides of the circuit board pair of core elements with successive elevations engages in at least one breakthrough of the circuit board. Assembly according to one of claims 3 to 6, characterized in that the circuit board forms a multi-layer structure for a plurality of conductor layers of the planar winding arrangements and / or is part of a layer arrangement of a plurality of printed circuit boards. Assembly according to one of claims 1 to 7, characterized in that the inductive electronic assembly is connected as a resonant converter with a plurality of realized by the planar winding arrangements transformers, wherein the second planar winding arrangement realizes an input side transformer and the additional planar winding arrangement a primary side of the input-side transformer associated leakage inductance forms. Use of the inductive electronic module according to one of Claims 1 to 8 in a current divider device, in particular for operating a plurality of string-like LEDs as a consumer, in which current divider device a current on the secondary side of a first, input-side transformer on at least two independently controlled consumer branches with at least one second Transformer is divided. Use according to claim 9, characterized in that the first transformer and the at least one second transformer is realized on the basis of a common core element or core element pair of the assembly, wherein the second planar winding arrangement forms the first transformer.

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