Patents by Inventor Chun-Iung Chiu

Chun-Iung Chiu 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).

  • PWM buffer circuit for adjusting a frequency and a duty cycle of a PWM signal
    Patent number: 7279947
    Abstract: A PWM buffer circuit includes a duty cycle converting circuit and a frequency-fixed PWM signal generating circuit. The duty cycle converting circuit is used for receiving a first PWM signal and then generating a duty cycle reference voltage on the basis of the first PWM signal. The duty cycle reference voltage is a one-to-one mapping function of the first duty cycle. The frequency-fixed PWM signal generating circuit is used for receiving the duty cycle reference voltage and then outputting a second PWM signal with a fixed frequency. The second PWM signal has a second duty cycle, which is determined in accordance with the duty cycle reference voltage. In addition, the second duty cycle is a one-to-one mapping function of the duty cycle reference voltage.
    Type: Grant
    Filed: September 9, 2003
    Date of Patent: October 9, 2007
    Assignee: Delta Electronics, Inc.
    Inventors: Chun-Iung Chiu, Wen-shi Huang