Patents by Inventor Chuan-Yo Hsiao

Chuan-Yo Hsiao 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).

  • LED controller with de-flicker function and LED de-flicker circuit and method thereof
    Patent number: 8436544
    Abstract: The present invention discloses an LED controller with de-flicker function and an LED de-flicker circuit and method thereof. The LED controller includes: a duty ratio calculation circuit for receiving a pulse width modulation (PWM) signal and generating a duty input signal, indicating a digital duty ratio of the PWM signal; an LED de-flicker circuit for receiving the duty input signal and generating a duty output signal wherein a noise in the duty input signal is filtered; and a dimming circuit for receiving the duty output signal and generating a dimming signal to control an LED circuit; wherein the duty output signal remains unchanged when the variation of the duty input signal is not larger than a hysteresis threshold, and the duty output signal follows the duty input signal when the variation of the duty input signal is larger than the hysteresis threshold.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: May 7, 2013
    Assignee: Richtek Technology Corporation
    Inventors: Shei-Chie Yang, Shui-Mu Lin, Chuan-Yo Hsiao, Huan-Chien Yang
  • Led controller with de-flicker function and led de-flicker circuit and method thereof
    Publication number: 20120013265
    Abstract: The present invention discloses an LED controller with de-flicker function and an LED de-flicker circuit and method thereof. The LED controller includes: a duty ratio calculation circuit for receiving a pulse width modulation (PWM) signal and generating a duty input signal, indicating a digital duty ratio of the PWM signal; an LED de-flicker circuit for receiving the duty input signal and generating a duty output signal wherein a noise in the duty input signal is filtered; and a dimming circuit for receiving the duty output signal and generating a dimming signal to control an LED circuit; wherein the duty output signal remains unchanged when the variation of the duty input signal is not larger than a hysteresis threshold, and the duty output signal follows the duty input signal when the variation of the duty input signal is larger than the hysteresis threshold.
    Type: Application
    Filed: November 10, 2010
    Publication date: January 19, 2012
    Inventors: Shei-Chie Yang, Shui-Mu Lin, Chuan-Yo Hsiao, Huan-Chien Yang