Patents by Inventor Xiuge Yang

Xiuge 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).

  • Lighting apparatus with variable current switching frequency and methods of operating same
    Patent number: 9585218
    Abstract: An apparatus includes a current modulation circuit configured to modulate a current in at least one light-emitting device responsive to a pulse width modulated control signal and a control circuit configured to control a pulse width of the pulse width modulated control signal responsive to a first control input and to control a frequency of the pulse width modulated control signal responsive to a second control input. The first control input may include, for example, a current control input, and the second control input may include a light intensity control input, such as a dimming input. The control circuit may be configured to increase the frequency responsive to a change in the light intensity control input corresponding to a decrease in light intensity and to decrease the frequency responsive to a change in the light intensity control input corresponding to an increase in light intensity.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: February 28, 2017
    Assignee: Cree, Inc.
    Inventors: Daniel Pope, Xiuge Yang
  • LIGHTING APPARATUS WITH VARIABLE CURRENT SWITCHING FREQUENCY AND METHODS OF OPERATING SAME
    Publication number: 20160057823
    Abstract: An apparatus includes a current modulation circuit configured to modulate a current in at least one light-emitting device responsive to a pulse width modulated control signal and a control circuit configured to control a pulse width of the pulse width modulated control signal responsive to a first control input and to control a frequency of the pulse width modulated control signal responsive to a second control input. The first control input may include, for example, a current control input, and the second control input may include a light intensity control input, such as a dimming input. The control circuit may be configured to increase the frequency responsive to a change in the light intensity control input corresponding to a decrease in light intensity and to decrease the frequency responsive to a change in the light intensity control input corresponding to an increase in light intensity.
    Type: Application
    Filed: August 21, 2014
    Publication date: February 25, 2016
    Inventors: Daniel Pope, Xiuge Yang