公开(公告)号：US20230378765A1

公开(公告)日：2023-11-23

申请号：US18316395

申请日：2023-05-12

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Fangcheng LIU ,  Xiongfei WANG ,  Teng LIU

IPC: H02J3/38

CPC classification number: H02J3/388 ,  H02J3/381 ,  H02J2300/24

Abstract: An islanding detection method includes: an alternating current frequency of an inverter is monitored. The alternating current frequency fluctuates within a preset range when in a normal mode. When an instantaneous shifting value of the alternating current frequency exceeds the preset range, a frequency detected before instantaneous shifting is a first frequency. When a frequency in first frequency data within a first preset time period is greater than or less than only the first frequency, an alternating current frequency detected when the first preset time period ends is a second frequency. Output power of the inverter is continuously adjusted based on a change in the current alternating current frequency. When a frequency in second frequency data within a second preset time period is greater than or less than only the second frequency, it may be indicated in time that islanding occurs in the inverter, and an islanding status is reported.

公开(公告)号：US20220285947A1

公开(公告)日：2022-09-08

申请号：US17686163

申请日：2022-03-03

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Wanyuan QU ,  Fangcheng LIU ,  Lei SHI ,  Wuhua LI

IPC: H02J3/38 ,  H02M3/156 ,  H02M1/00

Abstract: A voltage conversion circuit includes: an inductor, a first switch module, N second switch modules connected in series, N third switch modules connected in series, and N−1 flying capacitors. One terminal of the first switch module is separately connected to one terminal of the N second switch modules connected in series and one terminal of the N third switch modules connected in series. The other terminal of the N third switch modules connected in series is connected to a positive electrode of a high-voltage power supply. The other terminal of the first switch module and the other terminal of the N second switch modules connected in series are connected to a negative electrode of the high-voltage power supply. A low-voltage power supply is connected to the two terminals of the first switch module through the inductor. In embodiments of this application, a higher boost ratio can be implemented.

公开(公告)号：US20220194157A1

公开(公告)日：2022-06-23

申请号：US17552285

申请日：2021-12-15

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Fangcheng LIU ,  Kai XIN ,  Yunfeng LIU

IPC: B60G17/015 ,  B60G17/019 ,  B60G17/016

Abstract: This application provides a vehicle and a control method for a vehicle suspension. The vehicle includes a first component, a second component, and a vehicle suspension. The vehicle suspension is located between the first component and the second component. The first component is a component that the vehicle suspension bears, the second component is configured to bear the vehicle suspension and the first component, and the vehicle suspension includes a variable damper connected between the first component and the second component. The variable damper is configured to provide a first force to the first component based on a first acceleration of the first component, to control a displacement of the first component relative to the second component in a height direction of the vehicle. In the embodiments of this application, bumps in a driving process of the vehicle can be effectively reduced, so that vehicle ride comfort is improved.