公开(公告)号：US11201549B2

公开(公告)日：2021-12-14

申请号：US16945091

申请日：2020-07-31

Applicant: Huawei Technologies Co., Ltd.

Inventor： Yanzhong Zhang ,  Chunyang Liu ,  Zheng Ma

IPC: H02M3/335 ,  H02M7/483 ,  H02M1/00 ,  H02M7/48 ,  H02M3/00

Abstract: A related power conversion circuit includes a three-level switch circuit and a resonant circuit, and a control method of the related power conversion circuit includes: controlling all transistors in the three-level switch circuit to be turned off, where a body diode connected in parallel to a transistor S1, a body diode connected in parallel to a transistor Q1, and a body diode connected in parallel to a transistor Q2 are all turned on based on a current freewheeling function of the resonant circuit; controlling the S1 to be turned on, to set up a first working state of the power conversion circuit; and after the first working state lasts for a time length T1, controlling the Q1 and the Q2 to be turned on.

公开(公告)号：US11984831B2

公开(公告)日：2024-05-14

申请号：US17752512

申请日：2022-05-24

Applicant: Huawei Technologies Co., Ltd.

Inventor： Ningbo Feng ,  Chunyang Liu

IPC: H02P29/028 ,  H02P25/22 ,  H02P27/08

CPC classification number: H02P29/028 ,  H02P25/22 ,  H02P27/08

Abstract: A device for controlling a motor is provided. A type of a power component in a first drive circuit of the device is different from a type of a power component in a second drive circuit of the device. A loss of the power component in the first drive circuit is greater than a loss of the power component in the second drive circuit. When determining that a load of the motor is less than a preset load, a controller of the device controls the first drive circuit to stop working and controls the second drive circuit to start to work. When determining that the load of the motor is greater than or equal to the preset load, the controller controls both the first drive circuit and the second drive circuit to start to work.