Patents by Inventor Zhongyi Quan

Zhongyi Quan 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
  • 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