公开(公告)号：US20240088785A1

公开(公告)日：2024-03-14

申请号：US18517117

申请日：2023-11-22

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xinyu YU ,  Yunfeng LIU ,  Kai XIN ,  Fuqiang XU

IPC: H02M3/07 ,  H02J3/38 ,  H02M7/487 ,  H02M7/493

CPC classification number: H02M3/07 ,  H02J3/381 ,  H02M7/487 ,  H02M7/493 ,  H02J2300/26 ,  H02M1/0054

Abstract: The embodiments provide an RSCC and a control method thereof. The RSCC includes an input capacitor, an output capacitor, N parallel RSC branches, and a controller. The controller is configured to: determine an average value of characteristic currents of N resonance units; and reduce a duty cycle of a control signal of a charging switch in a first switch unit when determining that a characteristic current of a first resonance unit is greater than the average value, where a corresponding branch is in a charging stage when the charging switch is turned on; or reduce a duty cycle of a control signal of a discharging switch in a first switch unit when determining that a characteristic current of a first resonance unit is less than the average value, where a corresponding branch is in a discharging stage when the discharging switch is turned on.

公开(公告)号：US20230402941A1

公开(公告)日：2023-12-14

申请号：US18454581

申请日：2023-08-23

Applicant: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Inventor： Xinyu YU ,  Kai XIN ,  Haibin GUO ,  Fuqiang XU

IPC: H02M7/5388 ,  H02M1/12 ,  H02M1/14 ,  H02M7/483

CPC classification number: H02M7/5388 ,  H02M1/12 ,  H02M1/14 ,  H02M7/483

Abstract: This application discloses a common-mode voltage adjustment method and apparatus, and a control system, and relates to the field of electronic technologies. In an example method, a controller generates an injection instruction of a first common-mode voltage based on a first modulation scheme, generates an injection instruction of a second common-mode voltage based on a second modulation scheme, and generates an injection instruction of a third common-mode voltage based on the injection instruction of the first common-mode voltage and the injection instruction of the second common-mode voltage during a modulation scheme switching period. The injection instruction of the third common-mode voltage may be used to control a inverter circuit to output the third common-mode voltage.

公开(公告)号：US20230318434A1

公开(公告)日：2023-10-05

申请号：US18329902

申请日：2023-06-06

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Fuqiang XU ,  Jun WANG ,  Xinyu YU ,  Kai XIN ,  Lei SHI

IPC: H02M1/00 ,  H02M3/158 ,  H02J3/38

CPC classification number: H02M1/0058 ,  H02M3/1582 ,  H02J3/381 ,  H02J2300/26

Abstract: A conversion circuit, a conversion circuit precharge control method, and a photovoltaic system avoid additional costs and avoid impact on a switch caused by a current generated in a circuit at a moment when an RSCC enters an operating state, thereby ensuring operating performance of the RSCC. The conversion circuit includes a first power supply, a resonant switched capacitor converter (RSCC), and a control circuit. The RSCC includes a switch unit, an output filter unit, a first input end, a second input end, and an output end. The first power supply is configured to supply an input voltage to the RSCC. The control circuit is configured to: before controlling the RSCC to operate, control the switch unit in the RSCC to transmit, to the output filter unit, electric energy supplied by the first power supply.

公开(公告)号：US20240048179A1

公开(公告)日：2024-02-08

申请号：US18488161

申请日：2023-10-17

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xinyu YU ,  Fuqiang XU ,  Kai XIN ,  Peng DONG

IPC: H04B3/54 ,  H04B3/30

CPC classification number: H04B3/54 ,  H04B3/30

Abstract: A power line communication (PLC) system includes a PLC signal transmitting end, a PLC signal receiving end, and a power electronic apparatus. The PLC signal transmitting end is connected to the PLC signal receiving end through a power line, and the power electronic apparatus is connected to the power line. The power electronic apparatus is configured to increase output impedance in a first PLC communication frequency band, to reduce interference from an output current of the power electronic apparatus to a PLC signal in the first PLC communication frequency band. The first PLC communication frequency band is a PLC communication frequency band in which the PLC signal transmitting end sends the PLC signal to the PLC signal receiving end. In this way, the interference from the power electronic apparatus to the PLC signal in the first PLC communication frequency band can be reduced without adding an additional passive filter.

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：US20230116892A1

公开(公告)日：2023-04-13

申请号：US17964121

申请日：2022-10-12

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Xinyu YU ,  Yuan YAO ,  Fuqiang XU ,  Kai XIN

IPC: H02J3/16 ,  H02M7/49 ,  H02M7/493 ,  H02J3/46

Abstract: A power supply system, a converter, and a circulating current suppression method of the converter. The power supply system includes at least two converters that are coupled between a direct current power supply and an alternating current grid. Each converter obtains target output reactive power when an output current of the converter starts to increase from an initial current, obtains a reactive power compensation parameter based on the three-phase output voltages. Further, each converter obtains compensated output reactive power of the converter based on the reactive power compensation parameter and adjusts actual output reactive power of the converter based on the target output reactive power and the compensated output reactive power, so that an absolute value of a difference between common-mode output voltages of any two of the at least two adjusted converters is less than a difference threshold.