公开(公告)号：US20240136917A1

公开(公告)日：2024-04-25

申请号：US18399724

申请日：2023-12-29

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Luyu Wang ,  Shuyu Ou ,  Chao Wu ,  Wenbo Sun ,  Grover Victor Torrico-Bascopé

IPC: H02M1/36 ,  H02M1/00 ,  H02M1/42 ,  H02M3/07 ,  H02M3/158 ,  H02M7/217

CPC classification number: H02M1/36 ,  H02M1/007 ,  H02M1/0095 ,  H02M1/4208 ,  H02M3/07 ,  H02M3/158 ,  H02M7/217 ,  H02M1/0096

Abstract: An AC-DC power converter has a power factor correction stage that receives grid power and produces DC bus power. A DC-DC converter stage receives the DC bus power and produces a DC output power. Energy storage is provided by a larger capacitance value first capacitor and a smaller capacitance value second capacitor coupled in series across the DC bus power with a switching device coupled in parallel with the smaller second capacitor. During converter start-up, the switching device is turned off and inrush current is controlled by transferring energy from the second capacitor to the first capacitor. During operation the switching device is turned on and the first capacitor provides energy storage for the DC bus power. When grid power is disconnected, hold-up time is extended by turning the switching device off and transferring energy from the first capacitor to the second capacitor.

公开(公告)号：US20240266751A1

公开(公告)日：2024-08-08

申请号：US18639920

申请日：2024-04-18

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zijing Du ,  Chao Wu ,  Xiaoxiao Wang ,  Weihong Xiao

IPC: H01Q21/00 ,  H01P3/08 ,  H01Q19/10 ,  H01Q21/24

CPC classification number: H01Q21/0075 ,  H01P3/081 ,  H01Q19/104 ,  H01Q21/24

Abstract: This disclosure provides a feed network, an antenna apparatus, and a communication device. A main portion is disposed with a first electric-conductor and a second electric-conductor. In addition, two branch portions are disposed, one end of a first branch portion is electrically connected to the first electric-conductor, and one end of a second branch portion is electrically connected to the second electric-conductor. In this way, when two radiation parts in a same polarization direction of a radiating element are electrically connected to the first branch portion and the second branch portion respectively, a transmission structure of the feed network may feed two radio frequency signals, for example, two equi-amplitude phase-inverted radio frequency signals, into the two radiation parts of the radiating element respectively. The feed network in this embodiment of this application has a simple line, so that space occupied by the feed network in the antenna apparatus is reduced.