公开(公告)号：US20240161968A1

公开(公告)日：2024-05-16

申请号：US18507751

申请日：2023-11-13

Applicant: DELTA ELECTRONICS, INC.

Inventor： Yi-Hsun CHIU ,  Yi-Sheng CHANG ,  Chun-Yu YANG ,  Meng-Chi TSAI

IPC: H01F27/28 ,  H02M3/00 ,  H05K1/16

CPC classification number: H01F27/2804 ,  H02M3/01 ,  H05K1/165 ,  H01F2027/2809 ,  H01F2027/2819

Abstract: A planar transformer is configured on a multi-layer circuit board of a resonant converter. The planar transformer includes multiple layers of primary-side traces, multiple layers of secondary-side traces, and an iron core. The primary-side traces serve as a primary-side coil of the transformer to generate a first direction magnetic flux when the resonant converter operates. The secondary-side traces serve as a secondary-side coil of the transformer to generate a second direction magnetic flux when the resonant converter operates. The primary-side traces and the secondary-side traces surround a first core pillar and the second core pillar, and the primary-side traces and the secondary-side traces are configured in a specific stacked structure on the multi-layer circuit board, so that a magnetomotive force of the planar transformer can maintain balance during the operation of the resonant converter.