Patents by Inventor Yunwei Li

Yunwei Li 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).

  • Publication number: 20210135577
    Abstract: A non-isolated multiport DC/DC converter topology is provided. The non-isolated multiport DC/DC converter topology is modular and can incorporate an unlimited number of independent input or output ports. The efficiency of the non-isolated multiport DC/DC converter topology is improved through partial power processing techniques without having isolation in the converter. The non-isolated multiport DC/DC converter topology also provides a balanced DC neutral point, making it an ideal candidate for bipolar DC grid or as the front-end of a multilevel DC/AC converter.
    Type: Application
    Filed: November 4, 2020
    Publication date: May 6, 2021
    Inventors: Yunwei Li, Zhongyi Quan
  • Patent number: 10924031
    Abstract: An internal parallelization based active neutral point clamped (IP-ANPC) converter is provided having a low switching frequency (LSF) part and a plurality of high switching frequency (HSF) modules. The HSF modules are connected in parallel and the converter is modular. The converter provides the benefits of modularity, improved reliability and efficiency, interleaving operation, and reasonable utilization of wide band gap (WBG) devices. A logic based flying capacitor voltage balancing scheme is also provided. The balancing scheme includes naturally balancing the voltage of the converter with phase shift pulse width modulation and redundantly balancing the voltage of the converter with redundant switching states.
    Type: Grant
    Filed: May 3, 2019
    Date of Patent: February 16, 2021
    Assignee: THE GOVERNORS OF THE UNIVERSITY OF ALBERTA
    Inventors: Yunwei Li, Zhongyi Quan
  • Patent number: 10768530
    Abstract: A developing apparatus includes a developing mechanism and a heating mechanism, and the heating mechanism includes a plurality of heating units. The plurality of heating units are provided above or below the developing mechanism, and each heating unit of the plurality of heating units is disposed independently.
    Type: Grant
    Filed: July 19, 2018
    Date of Patent: September 8, 2020
    Assignees: HEFEI BOE DISPLAY TECHNOLOGY CO., LTD., BOE TECHNOLOGY GROUP CO., LTD.
    Inventors: Kefang Wu, Wei Zhou, Jiarong Xu, Yunwei Li, Chaogun Wang, Zhenyu Wang, Yuandan Chen
  • Publication number: 20190363644
    Abstract: An internal parallelization based active neutral point clamped (IP-ANPC) converter is provided having a low switching frequency (LSF) part and a plurality of high switching frequency (HSF) modules. The HSF modules are connected in parallel and the converter is modular. The converter provides the benefits of modularity, improved reliability and efficiency, interleaving operation, and reasonable utilization of wide band gap (WBG) devices. A logic based flying capacitor voltage balancing scheme is also provided. The balancing scheme includes naturally balancing the voltage of the converter with phase shift pulse width modulation and redundantly balancing the voltage of the converter with redundant switching states.
    Type: Application
    Filed: May 3, 2019
    Publication date: November 28, 2019
    Inventors: Yunwei Li, Zhongyi Quan
  • Publication number: 20190258167
    Abstract: The present disclosure provides a developing apparatus, which includes a developing mechanism and a heating mechanism, and the heating mechanism includes a plurality of heating units. The plurality of heating units are provided above or below the developing mechanism, and each heating unit of the plurality of heating units is disposed independently.
    Type: Application
    Filed: July 19, 2018
    Publication date: August 22, 2019
    Inventors: Kefang WU, Wei ZHOU, Jiarong XU, Yunwei LI, Chaogun WANG, Zhenyu WANG, Yuandan CHEN
  • Patent number: 7683568
    Abstract: The switching rectifier and switching inverter on a motor drive unit are modulated to indirectly change the magnitude of current and voltage stored in DC link by controlling the magnetic field of the motor to correct for both power factor lead and power factor lag over a wide range of motor speeds and conditions while maintaining a predetermined motor operating point.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: March 23, 2010
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Manish Pande, Yunwei Li
  • Publication number: 20090085510
    Abstract: The switching rectifier and switching inverter on a motor drive unit are modulated to indirectly change the magnitude of current and voltage stored in DC link by controlling the magnetic field of the motor to correct for both power factor lead and power factor lag over a wide range of motor speeds and conditions while maintaining a predetermined motor operating point.
    Type: Application
    Filed: September 28, 2007
    Publication date: April 2, 2009
    Inventors: Manish Pande, Yunwei Li