公开(公告)号：US20210050797A1

公开(公告)日：2021-02-18

申请号：US17088088

申请日：2020-11-03

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Fei XU ,  Fei YE ,  Lei SHI

IPC: H02M7/487 ,  H02M7/5387 ,  G01R19/175 ,  H02M1/38

Abstract: Embodiments of the present application disclose a multi-level inverter clamping modulation method and apparatus, and an inverter. Switching elements of an inverter are controlled when an output voltage of the inverter crosses zero, and switching elements in each inverter bridge arm of an active clamp multi-level inverter include an internal tube, an external tube, and a clamping tube. The internal tube and the external tube are connected in series between a positive bus and a negative bus, the clamping tube is connected between a common terminal of the internal tube and the external tube and a bus, the internal tube is a low-frequency switching element, and the external tube and the clamping tube are high-frequency switching elements.

公开(公告)号：US20200218453A1

公开(公告)日：2020-07-09

申请号：US16822754

申请日：2020-03-18

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Fei XU

IPC: G06F3/06 ,  G06F9/48 ,  G06F9/38

Abstract: A storage system and method for performing upgrade management are provided. A plurality of nodes in the storage systems are divided into groups. A scheduling node obtains a constraint condition of each group. The constraint condition comprises a maximum quantity of nodes in a corresponding group that are allowed to be upgraded in parallel. Nodes in a first batch for upgrading in parallel from the groups based on the constraint condition of each group are selected. An upgrade instruction is sent to the nodes in the first batch.