Patents by Inventor Chun-Ming Chuang

Chun-Ming Chuang 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).

  • Duty cycle adjusting circuit of a lighting system and method thereof
    Patent number: 8410707
    Abstract: The present disclosure relates to a duty cycle adjusting circuit of a lighting system and method thereof for sensing light of a first color and a second color emitted by a light emitting device of the first color and a light emitting device of the second color to generate corresponding intensity values. Then a first pulse width correcting value and a second pulse width correcting value can be calculated for adjusting a first duty cycle and a second duty cycle of a driving current to adjust the illuminating intensity of the light emitting devices of the first and the second colors. Through these adjusting steps, the light of the first and the second colors is within a predetermined range of color temperature. Therefore, light source for stable light in color temperature is provided.
    Type: Grant
    Filed: October 1, 2010
    Date of Patent: April 2, 2013
    Assignee: UPEC Electronics Corp.
    Inventors: Chia-Shen Teng, Tze-Ching Tung, Chun-Ming Chuang
  • DUTY CYCLE ADJUSTING CIRCUIT OF A LIGHTING SYSTEM AND METHOD THEREOF
    Publication number: 20110080099
    Abstract: The present disclosure relates to a duty cycle adjusting circuit of a lighting system and method thereof for sensing light of a first color and a second color emitted by a light emitting device of the first color and a light emitting device of the second color to generate corresponding intensity values. Then a first pulse width correcting value and a second pulse width correcting value can be calculated for adjusting a first duty cycle and a second duty cycle of a driving current to adjust the illuminating intensity of the light emitting devices of the first and the second colors. Through these adjusting steps, the light of the first and the second colors is within a predetermined range of color temperature. Therefore, light source for stable light in color temperature is provided.
    Type: Application
    Filed: October 1, 2010
    Publication date: April 7, 2011
    Applicant: UPEC ELECTRONICS CORP.
    Inventors: Chia-Shen Teng, Tze-Ching Tung, Chun-Ming Chuang