Patents by Inventor ZHENG-XUAN WU

ZHENG-XUAN WU 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).

  • Circuit system and circuit control method applied to motor drive
    Patent number: 11469703
    Abstract: A circuit system and a circuit control method applied to a motor drive are disclosed. The circuit control method includes the steps of providing a phase-locked circuit unit and providing a PWM control unit. The phase-locked circuit unit enables a first carrier signal and a second carrier signal to have identical amplitudes and starting points. The PWM control unit compares the first carrier signal with a reference signal for controlling a switch. When a load current is independently supplied by at least one DC capacitor, a SVPWM control unit controls an inverter unit for the load current to be zero, thereby reducing DC voltage ripple, operation loss and transient voltage surge.
    Type: Grant
    Filed: June 1, 2021
    Date of Patent: October 11, 2022
    Assignee: National Cheng Kung University
    Inventors: Mi-Ching Tsai, Fu-Sheng Pai, Min-Fu Hsieh, Kai-Jung Shih, Zheng-Xuan Wu
  • CIRCUIT SYSTEM AND CIRCUIT CONTROL METHOD APPLIED TO MOTOR DRIVE
    Publication number: 20210399669
    Abstract: A circuit system and a circuit control method applied to a motor drive are disclosed. The circuit control method includes the steps of providing a phase-locked circuit unit and providing a PWM control unit. The phase-locked circuit unit enables a first carrier signal and a second carrier signal to have identical amplitudes and starting points. The PWM control unit compares the first carrier signal with a reference signal for controlling a switch. When a load current is independently supplied by at least one DC capacitor, a SVPWM control unit controls an inverter unit for the load current to be zero, thereby reducing DC voltage ripple, operation loss and transient voltage surge.
    Type: Application
    Filed: June 1, 2021
    Publication date: December 23, 2021
    Inventors: MI-CHING TSAI, FU-SHENG PAI, MIN-FU HSIEH, KAI-JUNG SHIH, ZHENG-XUAN WU