公开(公告)号：US20240055993A1

公开(公告)日：2024-02-15

申请号：US18496212

申请日：2023-10-27

Applicant: Huawei Technologies Co., Ltd.

Inventor： Piniwan Thiwanka Bandara Wijekoon ,  Sebastian Rosado ,  Zhaohui Wang

IPC: H02M3/158 ,  H02M1/088 ,  H02M1/00

CPC classification number: H02M3/1584 ,  H02M1/088 ,  H02M1/0048

Abstract: A converter comprises a first circuit part and a second circuit part configured to be electrically connected with each other. Each circuit part comprises two or more switches configured to be switched for the power conversion, the switches being semiconductor switches. The two or more switches of the first circuit part are configured for a first switching operation of the first circuit part. The two or more switches of the second circuit part are configured for a second switching operation of the second circuit part. The first switching operation causes a greater electrical power loss compared to the second switching operation. The two circuit parts are configured such that the first circuit part is configured to operate at a higher operating temperature compared to the second circuit part.

公开(公告)号：US20240333124A1

公开(公告)日：2024-10-03

申请号：US18741105

申请日：2024-06-12

Applicant: Huawei Technologies Co., Ltd.

Inventor： Sebastian Rosado ,  Piniwan Thiwanka Bandara Wijekoon ,  Zhaohui Wang

IPC: H02M1/00 ,  H02M3/07 ,  H02M7/483

CPC classification number: H02M1/0003 ,  H02M3/07 ,  H02M7/483

Abstract: A balancer circuit for a series connection of two direct current (DC)-link capacitors comprises a first and second terminal for being connected to a first and second terminal of the series connection of the capacitors, respectively; and a third terminal for being connected to a node between the capacitors. The balancer circuit comprises a first and second inductor and a capacitor arrangement connected in series between the first and second terminal of the balancer circuit. The capacitor arrangement is connected between the first and second inductor. The balancer circuit comprises a first switch arrangement connected between the third terminal and a node between the first inductor and the capacitor arrangement; and a second switch arrangement connected between the third terminal and a node between the second inductor and the capacitor arrangement. The first and second switch arrangement each comprises a semiconductor switch or two semiconductor switches connected in series.

公开(公告)号：US20240266972A1

公开(公告)日：2024-08-08

申请号：US18640731

申请日：2024-04-19

Applicant: Huawei Technologies Co., Ltd.

Inventor： Sebastian Rosado ,  Zhaohui Wang ,  Miroljub Bakic ,  Piniwan Thiwanka Bandara Wijekoon

IPC: H02M7/483 ,  H02M1/00 ,  H02M3/335 ,  H02M7/493

CPC classification number: H02M7/4833 ,  H02M1/0043 ,  H02M7/493 ,  H02M3/33584

Abstract: A power conversion system includes a first direct current to alternating current (DC-AC) inverter, a second DC-AC inverter, an inverter controller, a direct current (DC)-link circuit connecting the first DC-AC inverter and the second DC-AC inverter, a neutral-point balancer (NPB), an NPB circuit, and an NPB controller. The inverter controller is configured to provide a pulse-width modulation (PWM), signal to the first DC-AC inverter and the second DC-AC inverter. The NPB circuit is configured to reduce low frequency current oscillations in the DC-link circuit by switching between a first state for transferring charge from a positive voltage line to a neutral voltage line, and a second state for transferring charge from the neutral voltage line to a negative voltage line. The NPB controller is configured to control the switching of the NPB circuit and is synchronized with the PWM signal from the inverter controller.