公开(公告)号：US20250087410A1

公开(公告)日：2025-03-13

申请号：US18462723

申请日：2023-09-07

Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.

Inventor： Feng Jin ,  Ahmed Nabih ,  Qiang Li

IPC: H01F27/30 ,  H01F27/24 ,  H02M3/335

Abstract: Power converters with integrated transformers and resonant inductors are described. An example integrated transformer can be electrically coupled between a primary-side converter stage and a secondary-side converter stage in a power converter. The integrated transformer can include a magnetic core with plurality of core legs, a primary winding extending around each of the plurality of core legs, and a secondary winding extending around each of the plurality of core legs. A winding direction of the primary winding is alternated between adjacent core legs among the plurality of core legs, and a winding direction of the secondary winding is alternated between adjacent core legs among the plurality of core legs. Additionally, a number of winding turns of the primary winding and a number of winding turns of the secondary winding on a first core leg is different than on a second core leg among the plurality of core legs.

公开(公告)号：US20250046512A1

公开(公告)日：2025-02-06

申请号：US18362222

申请日：2023-07-31

Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.

Inventor： Ahmed Nabih ,  Feng Jin ,  Qiang Li

IPC: H01F27/28 ,  H01F27/26 ,  H02M1/00 ,  H02M3/335

Abstract: Power converters with integrated transformers and resonant inductors are described. An example power converter includes a primary-side converter stage, a number of secondary-side converter stages, and an integrated transformer and resonant inductor coupled between the primary-side and secondary-side converter stages. The integrated transformer includes a magnetic core having a first leg, an auxiliary leg, and a second leg. The integrated transformer also includes a first transformer having a first primary winding, a first secondary winding, and a first shield winding on the first leg, and a second transformer having a second primary winding, a second secondary winding, and a second shield winding on the second leg. The first shield winding is electrically coupled to provide an extension of the first primary winding for the first transformer, and an end of the first shield winding or the second shield winding is electrically coupled to a primary-side ground of the power converter.

公开(公告)号：US20250006423A1

公开(公告)日：2025-01-02

申请号：US18760320

申请日：2024-07-01

Applicant: VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.

Inventor： Pranav Raj Prakash ,  Ahmed Nabih ,  Qiang Li

IPC: H01F38/00 ,  H01F27/24 ,  H01F27/28 ,  H05K1/18

Abstract: An example transformer cell includes a printed circuit board (PCB) having a plurality of layers and at least two transformers. The at least two transformers include a primary winding implemented in a plurality of primary layers among the plurality of layers, a plurality of secondary windings implemented in a plurality of secondary layers among the plurality of layers, and a core extending through the primary winding and the plurality of secondary windings. The transformer cell further includes a first output capacitor located above a top layer among the plurality of layers and along a first edge of the PCB, a second output capacitor located above the top layer along a second edge of the PCB, the second edge being opposite the first edge. The transformer cell additionally includes one or more switching devices located between the first and the second output capacitors.

公开(公告)号：US12009146B2

公开(公告)日：2024-06-11

申请号：US16864868

申请日：2020-05-01

Applicant: Virginia Tech Intellectual Properties, Inc.

Inventor： Ahmed Nabih ,  Qiang Li ,  Fred C. Lee

IPC: H01F27/24 ,  H01F27/28 ,  H01F27/34 ,  H01F30/04 ,  H01F38/02

CPC classification number: H01F27/346 ,  H01F27/24 ,  H01F27/2804 ,  H01F27/34 ,  H01F30/04 ,  H01F2027/2819 ,  H01F2038/026

Abstract: Various examples of magnetic integration of matrix transformers with controllable leakage inductance are described. In one example, a transformer includes a magnetic core comprising a plurality of core legs and a leakage core leg. The leakage core leg is positioned among the plurality of core legs to control a leakage inductance of the transformer. The transformer also includes a planar winding structure. The planar winding structure includes a primary winding and a plurality of secondary windings. The primary winding and the plurality of secondary windings extend in a number of turns around the plurality of core legs, without a turn around the leakage core leg, to further control the leakage inductance of the matrix transformer.

公开(公告)号：US20200350117A1

公开(公告)日：2020-11-05

申请号：US16864868

申请日：2020-05-01

Applicant: Virginia Tech Intellectual Properties, Inc.

Inventor： Ahmed Nabih ,  Qiang Li ,  Fred C. Lee

IPC: H01F27/34 ,  H01F27/28 ,  H01F27/24

Abstract: Various examples of magnetic integration of matrix transformers with controllable leakage inductance are described. In one example, a transformer includes a magnetic core comprising a plurality of core legs and a leakage core leg. The leakage core leg is positioned among the plurality of core legs to control a leakage inductance of the transformer. The transformer also includes a planar winding structure. The planar winding structure includes a primary winding and a plurality of secondary windings. The primary winding and the plurality of secondary windings extend in a number of turns around the plurality of core legs, without a turn around the leakage core leg, to further control the leakage inductance of the matrix transformer.