Combined Transformer and LLC Resonant Converter

Patent metadata

Field	Value
Publication number	US-2018366267-A1
Application number	US-201816110913-A
Country	US
Kind code	A1
Filing date	Aug 23, 2018
Priority date	Feb 24, 2016
Publication date	Dec 20, 2018
Grant date	—

Abstract

The invention relates to a combined transformer for an LLC resonant converter. The combined transformer includes a primary transformer winding configured to generate during operation a first magnetic flux, which forms a first magnetic circuit. The combined transformer also includes a resonant inductor having a winding, wherein the resonant inductor is configured to generate during operation a second magnetic flux, which forms a second magnetic circuit. The primary transformer winding and the winding of the resonant inductor are arranged with respect to one another such that at least one first part of the first magnetic circuit and at least one second part of the second magnetic circuit run on a magnetic path common to the first part and to the second part. The invention also relates to an LLC resonant converter with such a combined transformer.

First claim

What is claimed is:

1 . A combined transformer for an LLC resonant converter comprising:
a primary transformer winding configured to generate during operation a first magnetic flux, which forms a first magnetic circuit, and a resonant inductor having a winding, wherein the resonant inductor is configured to generate during operation a second magnetic flux, which forms a second magnetic circuit, wherein the primary transformer winding and the winding of the resonant inductor are arranged with respect to one another such that at least one first part of the first magnetic circuit and at least one second part of the second magnetic circuit run on a magnetic path common to the first part and to the second part.

2 . The combined transformer as claimed in claim 1 , wherein the primary transformer winding and the winding of the resonant inductor are arranged with respect to one another such that the first magnetic flux of the first magnetic circuit and the second magnetic flux of the second magnetic circuit are at least partly destructively superposed on the magnetic path common to the first part and to the second part.

3 . The combined transformer as claimed in claim 2 , wherein the destructive superposition is caused by at least one of an arrangement, winding direction and interconnection of the primary transformer winding and the resonant inductor.

4 . The combined transformer as claimed in claim 1 , wherein the first magnetic circuit and the second magnetic circuit are guided along a core and the first magnetic circuit and the second magnetic circuit are guided at least partly on respectively different segments of the core.

5 . The combined transformer as claimed in claim 2 , wherein the first magnetic circuit and the second magnetic circuit are guided along a core and the first magnetic circuit and the second magnetic circuit are guided at least partly on respectively different segments of the core.

6 . The combined transformer as claimed in claim 3 , wherein the first magnetic circuit and the second magnetic circuit are guided along a core and the first magnetic circuit and the second magnetic circuit are guided at least partly on respectively different segments of the core.

7 . The combined transformer as claimed in claim 4 , wherein a magnetically active cross section of the core at a location of the magnetic path common to the first part and to the second part is reduced with respect to another location outside of the magnetic path common to the first part and to the second part.

8 . The combined transformer as claimed in claim 5 , wherein a magnetically active cross section of the core at a location of the magnetic path common to the first part and to the second part is reduced with respect to another location outside of the magnetic path common to the first part and to the second part.

9 . The combined transformer as claimed in claim 6 , wherein a magnetically active cross section of the core at a location of the magnetic path common to the first part and to the second part is reduced with respect to another location outside of the magnetic path common to the first part and to the second part.

10 . The combined transformer as claimed in claim 4 , wherein the primary transformer winding and the winding of the resonant inductor are wound onto different limbs of the core.

11 . The combined transformer as claimed in claim 7 , wherein the primary transformer winding and the winding of the resonant inductor are wound onto different limbs of the core.

12 . The combined transformer as claimed in claim 4 , wherein the core is embodied as a PQ or E core.

13 . The combined transformer as claimed in claim 1 , wherein the primary transformer winding and the winding of the resonant inductor are wound in one piece.

14 . The combined transformer as claimed in claim 2 , wherein the primary transformer winding and the winding of the resonant inductor are wound in one piece.

15 . The combined transformer as claimed in claim 3 , wherein the primary transformer winding and the winding of the resonant inductor are wound in one piece.

16 . The combined transformer as claimed in claim 4 , wherein the primary transformer winding and the winding of the resonant inductor are wound in one piece.

17 . The combined transformer as claimed in claim 1 , wherein the combined transformer is configured to be used as an LLC transformer when the resonant inductor is electrically connected to a capacitor.

18 . An LLC resonant converter having a combined transformer, the combined transformer comprising:
a primary transformer winding configured to generate during operation a first magnetic flux, which forms a first magnetic circuit, and a resonant inductor having a winding, wherein the resonant inductor is configured to generate during operation a second magnetic flux, which forms a second magnetic circuit, wherein the primary transformer winding and the winding of the resonant inductor are arranged with respect to one another such that at least one first part of the first magnetic circuit and at least one second part of the second magnetic circuit run on a magnetic path common to the first part and to the second part.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Raimann Manuel

Classifications

• H01F37/00

  Fixed inductances not covered by group H01F17/00 · CPC title

• H01F27/38 Primary

  Auxiliary core members; Auxiliary coils or windings · CPC title

• H01F27/28

  Coils; Windings; Conductive connections · CPC title

• H01F30/10

  Single-phase transformers (H01F30/16 takes precedence) · CPC title

• H01F27/40

  Structural association with built-in electric component, e.g. fuse · CPC title