公开(公告)号：US20230344239A1

公开(公告)日：2023-10-26

申请号：US18345556

申请日：2023-06-30

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Yanzhong ZHANG ,  Hongmiao FANG ,  Bo YU ,  Jinxiang ZHAN ,  Tiansan LIN

IPC: H02J3/38 ,  H02M1/36 ,  H02M7/5387

CPC classification number: H02J3/381 ,  H02M1/36 ,  H02M7/53871 ,  H02J2300/24

Abstract: A first input end of a first inverter is connected to a second end of a direct current positive bus, and a second input end of the first inverter is connected to a second end of a neutral bus. A first input end of a second inverter is connected to the second end of the neutral bus, and a second input end of the second inverter is connected to a second end of a direct current negative bus. A controller is configured to control, in startup and shutdown processes, a voltage to ground of the direct current positive bus, a voltage to ground of the direct current negative bus, and a voltage to ground of the neutral bus each to be less than or equal to a preset voltage threshold, to ensure personal safety and device safety.

公开(公告)号：US20240297576A1

公开(公告)日：2024-09-05

申请号：US18582873

申请日：2024-02-21

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Jinxiang ZHAN ,  Kai GAO ,  Juncan WANG ,  Yongbing GAO

IPC: H02M1/32 ,  H02J3/38 ,  H02M3/158

CPC classification number: H02M1/322 ,  H02M3/158 ,  H02J3/38 ,  H02J2300/24

Abstract: A power conversion device includes a positive direct current bus, a negative direct current bus, a first capacitor, a second capacitor, a first inductor, a first discharge unit. The first capacitor is connected between the positive direct current bus and the negative direct current bus. The second capacitor is connected in series to the first inductor and then connected in parallel to the first capacitor, where a capacitance value of the second capacitor is greater than a capacitance value of the first capacitor. The first discharge unit is connected in parallel to the first inductor, and is configured to be in a conducted state when a voltage of the first inductor is greater than a first action voltage threshold. In the embodiments, a case in which a semiconductor device in the power conversion device has a risk of voltage overstress caused by a differential mode lightning strike can be avoided.

公开(公告)号：US20230318464A1

公开(公告)日：2023-10-05

申请号：US18327286

申请日：2023-06-01

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xinyu YU ,  Jinxiang ZHAN ,  Fuqiang XU ,  Jun WANG ,  Kai XIN

IPC: H02M3/335 ,  H02J3/38 ,  H02M3/00 ,  H02M7/487

CPC classification number: H02M3/33569 ,  H02J3/381 ,  H02M3/015 ,  H02M7/487 ,  H02J2300/24

Abstract: A direct current converter includes a three-level power switching circuit, a resonant circuit, and a controller. An output voltage at an output end of the three-level power switching circuit is used to charge the resonant circuit. The controller is configured to control power switching components in the three-level power switching circuit, so that when the resonant circuit performs charging or discharging at one half of a direct current voltage, one of the power switching components is connected to a current loop of the resonant circuit, and when the resonant circuit performs charging or discharging at the direct current voltage, two of the power switching components are connected to the current loop of the resonant circuit. By using the direct current converter, a voltage borne by the power switching component in the direct current converter during current conversion can be reduced, thereby improving reliability of the direct current converter.

公开(公告)号：US20240072784A1

公开(公告)日：2024-02-29

申请号：US18239871

申请日：2023-08-30

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Jinxiang ZHAN ,  Ting YU

IPC: H03K17/04 ,  H03K17/567

CPC classification number: H03K17/0406 ,  H03K17/567 ,  H03K2217/0081

Abstract: A drive acceleration circuit, including: a drive power supply, including an output end and a reference signal end, where the output end output a drive signal, and the reference signal end is connected to a connection end of a switching device and output a reference signal to the connection end; a first signal route, where the first signal route is connected to the output end of the drive power supply and a control end of the switching device, and is configured to drive, based on the drive signal, the switching device to turn on/off; and a second signal route, connected in parallel with the first signal route, including a drive acceleration unit and a selective conduction unit, one end of the drive acceleration unit is connected to the drive power supply, another end of the drive acceleration unit is connected to the switching device through the selective conduction unit.