Patents by Inventor Mao-Jang He

Mao-Jang He 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).

  • Five-level DC-AC converter
    Patent number: 8923027
    Abstract: A five-level DC-AC converter includes a capacitor set and a full-bridge circuit. The capacitor set contains two DC capacitors, a power electronic switch and two diodes. When the power electronic switch is turned on/off, the two DC capacitors are connected in series/parallel to provide a two-level DC voltage to the full-bridge circuit. The full-bridge circuit further converts the two-level DC voltage to output a voltage with three voltage levels in the positive half cycle and three voltage levels in the negative half cycle. This achieves the goal of using five power electronic switches to convert DC power into AC power with five voltage levels.
    Type: Grant
    Filed: February 13, 2012
    Date of Patent: December 30, 2014
    Assignee: Ablerex Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Wen-Jung Chiang, Ming-Pin Mai, Chia-Wei Chou, Mao-Jang He
  • FIVE-LEVEL DC-AC CONVERTER
    Publication number: 20130033912
    Abstract: A five-level DC-AC converter includes a capacitor set and a full-bridge circuit. The capacitor set contains two DC capacitors, a power electronic switch and two diodes. When the power electronic switch is turned on/off, the two DC capacitors are connected in series/parallel to provide a two-level DC voltage to the full-bridge circuit. The full-bridge circuit further converts the two-level DC voltage to output a voltage with three voltage levels in the positive half cycle and three voltage levels in the negative half cycle. This achieves the goal of using five power electronic switches to convert DC power into AC power with five voltage levels.
    Type: Application
    Filed: February 13, 2012
    Publication date: February 7, 2013
    Inventors: Chin-Chang Wu, Wen-Jung Chiang, Ming-Pin Mai, Chia-Wei Chou, Mao-Jang He