Patents by Inventor Kai Ming Tsang

Kai Ming Tsang 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).

  • Multi-function three-phase active power filter
    Patent number: 8004119
    Abstract: A new multi-function shunt active filter has been successfully implemented. The proposed decoupler and cascade controller provide a simple solution to power factor correction, reduction of harmonics loads and load balancing. The mathematical burden of resolving the load current to fundamental and harmonics is not required. The decoupler and controller can easily be implemented using low-cost analogue devices.
    Type: Grant
    Filed: July 7, 2008
    Date of Patent: August 23, 2011
    Assignee: The Hong Kong Polytechnic University
    Inventors: Kai Ming Tsang, Wai Lok Chan
  • Voltage dip and undervoltage compensator
    Patent number: 7800349
    Abstract: The present invention relates a system for compensating for a voltage dip and undervoltage containing a primary side and secondary side transformer, a voltage dip/swell detector, and a level detector/switch selector device, wherein the secondary side of the transformer possesses a minimally sufficient number of taps to allow the system to be modified to meet supply voltage dips. The system, in particular, allows for long term compensation of voltage dips and quick adjustment of load voltage, usually within one cycle. Methods of using the present invention are also presented.
    Type: Grant
    Filed: February 2, 2007
    Date of Patent: September 21, 2010
    Assignee: The Hong Kong Polytechnic University
    Inventors: Kai Ming Tsang, Wai Lok Chan
  • Multi-function three-phase active power filter
    Publication number: 20100001588
    Abstract: A new multi-function shunt active filter has been successfully implemented. The proposed decoupler and cascade controller provide a simple solution to power factor correction, reduction of harmonics loads and load balancing. The mathematical burden of resolving the load current to fundamental and harmonics is not required. The decoupler and controller can easily be implemented using low-cost analogue devices.
    Type: Application
    Filed: July 7, 2008
    Publication date: January 7, 2010
    Applicant: The Hong Kong Polytechnic University
    Inventors: Kai Ming Tsang, Wai Lok Chan
  • Voltage dip and undervoltage compensator
    Publication number: 20080186009
    Abstract: The present invention relates a system for compensating for a voltage dip and undervoltage containing a primary side and secondary side transformer, a voltage dip/swell detector, and a level detector/switch selector device, wherein the secondary side of the transformer possesses a minimally sufficient number of taps to allow the system to be modified to meet supply voltage dips. The system, in particular, allows for long term compensation of voltage dips and quick adjustment of load voltage, usually within one cycle. Methods of using the present invention are also presented.
    Type: Application
    Filed: February 2, 2007
    Publication date: August 7, 2008
    Applicant: The Hong Kong Polytechnic University
    Inventors: Kai Ming Tsang, Wai Lok Chan