Patents by Inventor Hongwen Yuan

Hongwen Yuan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for synchronizing PWM control signals of inverters, inverter, and power grid system
    Patent number: 11223205
    Abstract: A method for synchronizing PWM control signals of inverters, an inverter, and a power grid system are disclosed, so that PWM control signals of inverters connected to a power grid can be synchronized. A direct current voltage terminal of the inverter is connected to an external power supply, and an alternating current voltage terminal of the inverter is connected to an alternating current point of common coupling of a power grid, and the method includes: obtaining a phase of an alternating current voltage of the power grid (S101); determining a time period during which the phase of the alternating current voltage varies within a preset phase threshold interval; calculating a period of a preset carrier wave based on a preset carrier wave ratio and the time period (S103); and generating a PWM control signal of the inverter based on a PWM modulation signal and a preset carrier wave (S105).
    Type: Grant
    Filed: March 30, 2020
    Date of Patent: January 11, 2022
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Hongwen Yuan, Fuqiang Xu, Fangcheng Liu
  • METHOD FOR SYNCHRONIZING PWM CONTROL SIGNALS OF INVERTERS, INVERTER, AND POWER GRID SYSTEM
    Publication number: 20200227919
    Abstract: A method for synchronizing PWM control signals of inverters, an inverter, and a power grid system are disclosed, so that PWM control signals of inverters connected to a power grid can be synchronized. A direct current voltage terminal of the inverter is connected to an external power supply, and an alternating current voltage terminal of the inverter is connected to an alternating current point of common coupling of a power grid, and the method includes: obtaining a phase of an alternating current voltage of the power grid (S101); determining a time period during which the phase of the alternating current voltage varies within a preset phase threshold interval; calculating a period of a preset carrier wave based on a preset carrier wave ratio and the time period (S103); and generating a PWM control signal of the inverter based on a PWM modulation signal and a preset carrier wave (S105).
    Type: Application
    Filed: March 30, 2020
    Publication date: July 16, 2020
    Applicant: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Hongwen Yuan, Fuqiang Xu, Fangcheng Liu