Patents by Inventor Chien-Shen HUNG

Chien-Shen HUNG 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 filter circuit and related control system
    Patent number: 10756706
    Abstract: A filter circuit comprises a resistor-capacitor (RC) circuit, a comparator circuit, and an output control circuit. The RC circuit is configured to generate a ripple voltage according to the PWM signal. The comparator circuit couples with the RC circuit, and is configured to compare the ripple voltage with a first reference voltage, and output a switch signal according to a comparison result. The output control circuit couples with the comparator circuit and the RC circuit, and is configured to generate an output signal according to the switch signal and the PWM signal. When a duty ratio of the PWM signal is larger than a predetermined threshold value, the output signal is corresponding to the PWM signal. When the duty ratio of the PWM signal is smaller than the predetermined threshold value, the output signal is not corresponding to the PWM signal.
    Type: Grant
    Filed: August 23, 2018
    Date of Patent: August 25, 2020
    Assignee: LEXTAR ELECTRONICS CORPORATION
    Inventors: Tsung-Yuan Lai, Chien-Shen Hung, Hsien-Chih Ho
  • PWM FILTER CIRCUIT AND RELATED CONTROL SYSTEM
    Publication number: 20190199326
    Abstract: A filter circuit comprises a resistor-capacitor (RC) circuit, a comparator circuit, and an output control circuit. The RC circuit is configured to generate a ripple voltage according to the PWM signal. The comparator circuit couples with the RC circuit, and is configured to compare the ripple voltage with a first reference voltage, and output a switch signal according to a comparison result. The output control circuit couples with the comparator circuit and the RC circuit, and is configured to generate an output signal according to the switch signal and the PWM signal. When a duty ratio of the PWM signal is larger than a predetermined threshold value, the output signal is corresponding to the PWM signal. When the duty ratio of the PWM signal is smaller than the predetermined threshold value, the output signal is not corresponding to the PWM signal.
    Type: Application
    Filed: August 23, 2018
    Publication date: June 27, 2019
    Inventors: Tsung-Yuan LAI, Chien-Shen HUNG, Hsien-Chih HO