Patents by Inventor Yuan-Ho Liu

Yuan-Ho Liu 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).

  • Patent number: 7355152
    Abstract: A method of power control apparatus for electric cookers is provided. In the method, a micro controller unit (MCU) with a programmer pulse generator (PPG) and analog/digital (AID) converters is utilized, wherein a command can be inputted externally to the MCU for restarting or stopping the output of the PPG; and the PPG is capable of outputting pulses of programmable pulse width, being programmed by software for power control and, also, the protection of power control apparatus.
    Type: Grant
    Filed: October 31, 2006
    Date of Patent: April 8, 2008
    Assignee: Holtek Semiconductor Inc.
    Inventors: Yuan-Ho Liu, Chun-Hsiung Chen, Chun-Ku Lin
  • Patent number: 7312589
    Abstract: A driver control circuit and method for a cold cathode fluorescent lamp (CCFL), that the driver control circuit comprises: at least a comparator; at least an input/output port, at least an analog-to-digital converter; at least two programmable pulse generators (PPGs), including a first programmable pulse generator and a second programmable pulse generator, i.e. PPG0 and PPG1, being activated for generating pulse signals in an alternative manner for driving the CCFL; at least a programmable frequency divider (PFD), capable of programming the output thereof to be used as the control signal for activating the PPG0 and the PPG1 according to the alternative manner defined by the transition frequency of the PFD.
    Type: Grant
    Filed: January 25, 2006
    Date of Patent: December 25, 2007
    Assignee: Holtek Semiconductor
    Inventors: Yuan-Ho Liu, Chun-Hsiung Chen
  • Patent number: 7271372
    Abstract: A power control apparatus for electric cookers includes an input unit, an output unit, a micro controller unit (MCU), having a programmer pulse generator (PPG) and at least an analog/digital converter built therein, a power circuit, an exciter-coil circuit, an output circuit of insulated gate bipolar transistor (IGBT), and a drive circuit of insulated gate bipolar transistor (IGBT). A command can be inputted externally to the MCU for restarting or stopping the output of the PPG and the PPG is capable of outputting pulses of programmable pulse width.
    Type: Grant
    Filed: August 10, 2005
    Date of Patent: September 18, 2007
    Assignee: Holtek Semiconductor
    Inventors: Yuan-Ho Liu, Chun-Hsiung Chen, Chun-Ku Lin
  • Publication number: 20070126375
    Abstract: A driver control circuit and method for a cold cathode fluorescent lamp (CCFL), that the driver control circuit comprises: at least a comparator; at least an input/output port, at least an analog-to-digital converter; at least two programmable pulse generators (PPGs), including a first programmable pulse generator and a second programmable pulse generator, i.e. PPG0 and PPG1, being activated for generating pulse signals in an alternative manner for driving the CCFL; at least a programmable frequency divider (PFD), capable of programming the output thereof to be used as the control signal for activating the PPG0 and the PPG1 according to the alternative manner defined by the transition frequency of the PFD.
    Type: Application
    Filed: January 25, 2006
    Publication date: June 7, 2007
    Inventors: Yuan-Ho Liu, Chun-Hsiung Chen
  • Publication number: 20070045294
    Abstract: A power control apparatus for electric cookers is disclosed, which comprises: an input unit, for setting parameters of temperature control, power control and timing control, etc.; an output unit, for displaying parameters of temperature, power and timing, etc.
    Type: Application
    Filed: October 31, 2006
    Publication date: March 1, 2007
    Inventors: Yuan-Ho Liu, Chun-Hsiung Chen, Chun-Ku Lin
  • Publication number: 20070012684
    Abstract: A power control apparatus for electric cookers is disclosed, which comprises: an input unit, for setting parameters of temperature control, power control and timing control, etc.; an output unit, for displaying parameters of temperature, power and timing, etc.
    Type: Application
    Filed: August 10, 2005
    Publication date: January 18, 2007
    Inventors: Yuan-Ho Liu, Chun-Hsiung Chen, Chun-Ku Lin