Patents by Inventor Jack Yongchen Yang

Jack Yongchen Yang 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).

  • Regenerative variable frequency drive
    Patent number: 8941340
    Abstract: A regenerative variable frequency drive includes an active converter connected to an inverter. The converter has a filter capacitor, an inductor, two half bridges, bus bars that connect to the inverter and bus capacitors. The converter converts single phase AC power to DC power and DC power to single phase AC power, boosts the AC power, reduces input line harmonics, maintains input current in phase with utility voltage in order to achieve near unity power factor, and maintains constant DC voltage between the bus bars.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: January 27, 2015
    Inventors: Larry G. Meiners, Theodore Clifton Pettyjohn, Jack Yongchen Yang, Peda V. Medagam