公开(公告)号：US11632055B2

公开(公告)日：2023-04-18

申请号：US17359135

申请日：2021-06-25

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Qinglei Wang ,  Qinghui Hou ,  Chenghao Sun ,  Wei Liu

IPC: H02M3/335 ,  H02M1/00

Abstract: An Active Clamp Flyback (ACF) converter includes a transformer module, a clamping module, and a controller. The controller is configured to: after the transformer module starts secondary side discharging, control the clamping module to start receiving leakage inductance power from the transformer module; and after controlling the clamping module to stop receiving the leakage inductance power from the transformer module, control the clamping module to release the leakage inductance power to the transformer module. The leakage inductance power released by the clamping module to the transformer module is used by the transformer module to restore a soft switching state based on the leakage inductance power. In a process of transferring the leakage inductance power to a clamping capacitor, the clamping module is in an enabled state. This reduces a loss caused by the clamping module to the leakage inductance power, and helps reduce overall loss caused by the ACF converter.

公开(公告)号：US20240258008A1

公开(公告)日：2024-08-01

申请号：US18635000

申请日：2024-04-15

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Chenghao Sun ,  Huasheng Liu ,  Weiyang Zhao

IPC: H01F17/06 ,  H01F17/00 ,  H01F41/08

CPC classification number: H01F17/062 ,  H01F41/08 ,  H01F2017/0093 ,  H01F2017/065

Abstract: A common mode choke includes a toroidal magnetic core and N windings wound on the toroidal magnetic core. The N windings are rotationally symmetric in a central direction of the toroidal magnetic core. Each of the N windings includes two lead ends which are respectively located at outermost layers of two sides of each winding. Each of the N windings includes a first group of windings and a second group of windings. A starting point of each of the N windings is located between the first group of windings and the second group of windings. A quantity of winding sections in the first group of windings is different from a quantity of winding sections in the second group of windings. Each winding section in both the first group of windings and the second group of windings includes a plurality of winding layers. Each winding layer includes a plurality of coils.