公开(公告)号：US20190280520A1

公开(公告)日：2019-09-12

申请号：US16426922

申请日：2019-05-30

Applicant: Huawei Technologies Co., Ltd.

Inventor： Chuntao ZHANG

IPC: H02J9/06 ,  H02J3/38 ,  H02J9/00

Abstract: A working method of a modular uninterruptible power supply (UPS) includes: obtaining working parameters of the modular UPS, where the working parameters include an input voltage parameter, a load parameter, and a battery parameter; and adjusting a working mode of a power module in the modular UPS according to at least one of the working parameters of the modular UPS, so that not all power modules are in a same working mode, where the modular UPS includes K working modules, and 2≤K.

公开(公告)号：US20200099313A1

公开(公告)日：2020-03-26

申请号：US16698517

申请日：2019-11-27

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zhuyong HUANG ,  Xiaofei ZHANG ,  Chuntao ZHANG

IPC: H02M7/483 ,  H02M7/5387

Abstract: A multi-level circuit, a three-phase multi-level circuit, and a control method are provided. The multi-level circuit includes two groups of bus capacitors (C1 and C2) that are connected in series; a plurality of switching transistor branches that are connected in parallel to the capacitors, where each switching transistor branch includes a first half bridge (Q1 and Q2) and a second half bridge (Q3 and Q4), and a common terminal of the two half bridges is grounded (N); and two negative coupled inductors (L1 and L2), where each input terminal of each negative coupled inductor is connected to a common terminal (A1 and A2) of two switching transistors in the first half bridge in only one of the switching transistor branches. In this circuit, a quantity of groups of bus capacitors is decreased and circuit design complexity is reduced. Further, a dropout voltage of the switching transistors is reduced.

公开(公告)号：US20180302005A1

公开(公告)日：2018-10-18

申请号：US16015217

申请日：2018-06-22

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zhaoxue CUI ,  Chuntao ZHANG

IPC: H02M7/537

CPC classification number: H02M7/537 ,  H02M7/487 ,  H02M2001/0051 ,  Y02B70/1491

Abstract: This disclosure relates to an equivalent transistor and a three-level inverter, and pertains to the field of power electronics technologies. The equivalent transistor includes a first transistor, a second transistor, and a diode. A source electrode of the first transistor is electrically connected to a source electrode of the second transistor; a gate electrode of the first transistor is electrically connected to a gate electrode of the second transistor; and one end of the diode is electrically connected to a drain electrode of the first transistor, and the other end of the diode is electrically connected to a drain electrode of the second transistor. According to this disclosure, a reverse recovery time can be reduced, and a switching speed of the equivalent transistor can increase.

公开(公告)号：US20220200329A1

公开(公告)日：2022-06-23

申请号：US17562638

申请日：2021-12-27

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Chuntao ZHANG

IPC: H02J9/06 ,  H02J3/38 ,  H02J9/00

Abstract: A working method of a modular uninterruptible power supply (UPS) includes: obtaining working parameters of the modular UPS, where the working parameters include an input voltage parameter, a load parameter, and a battery parameter; and adjusting a working mode of a power module in the modular UPS according to at least one of the working parameters of the modular UPS, so that not all power modules are in a same working mode, where the modular UPS includes K working modules, and 2≤K.

公开(公告)号：US20210408808A1

公开(公告)日：2021-12-30

申请号：US17471680

申请日：2021-09-10

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Chuntao ZHANG

IPC: H02J7/00 ,  H02J9/06 ,  H02J7/34

Abstract: This application provides a battery equalization circuit to resolve a problem of insufficient charging or discharging of some batteries due to differences between a plurality of batteries in a battery group. Equalization sub-circuits of the battery equalization circuit each include a battery cell, a first bidirectional switch, and a second bidirectional switch. Battery cells of the plurality of equalization sub-circuits are connected in series. When a strobe terminal of the first bidirectional switch receives a turning-on signal, the first bidirectional switch is turned on and couples the positive electrode of the battery cell to a first terminal of an energy storage device. When a strobe terminal of the second bidirectional switch receives a turning-on signal, the second bidirectional switch is turned on and couples the negative electrode of the battery cell to the second terminal of the energy storage device.