Patents by Inventor Quanwang Liu

Quanwang 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).

  • Dual input power management method and system
    Patent number: 10216210
    Abstract: A dual input power management method includes: monitoring whether a first input terminal has a power supply and whether a second input terminal has a power supply, and accordingly generating a first monitor signal and a second monitor signal; generating a priority signal based on the first monitor signal, the second monitor signal, and an enable signal, to determine an input priority of the first input terminal and the second input terminal; generating a control signal based on a feedback signal indicative of an output voltage and a reference signal; and regulating the output voltage based on the priority signal and the control signal.
    Type: Grant
    Filed: March 23, 2017
    Date of Patent: February 26, 2019
    Assignee: O2MICRO INC.
    Inventors: Guoxing Li, Quanwang Liu
  • DUAL INPUT POWER MANAGEMENT METHOD AND SYSTEM
    Publication number: 20180275704
    Abstract: A dual input power management method includes: monitoring whether a first input terminal has a power supply and whether a second input terminal has a power supply, and accordingly generating a first monitor signal and a second monitor signal; generating a priority signal based on the first monitor signal, the second monitor signal, and an enable signal, to determine an input priority of the first input terminal and the second input terminal; generating a control signal based on a feedback signal indicative of an output voltage and a reference signal; and regulating the output voltage based on the priority signal and the control signal.
    Type: Application
    Filed: March 23, 2017
    Publication date: September 27, 2018
    Inventors: Guoxing LI, Quanwang LIU
  • Charge pump systems with adjustable frequency control
    Patent number: 9118238
    Abstract: An electronic system includes a charge pump driver for generating an output to control an electronic element. The electronic system further includes a clock generator coupled to the charge pump driver. The clock generator can generate a clock signal to control the charge pump driver and adjust a frequency of the clock signal according to a status of the electronic element.
    Type: Grant
    Filed: November 17, 2008
    Date of Patent: August 25, 2015
    Assignee: O2Micro, Inc.
    Inventors: Quanwang Liu, Guo Xing Li, Shiqiang Liu
  • Calibrating a system by setting difference between signals
    Patent number: 8169249
    Abstract: In a signal monitoring system, a circuit includes an input terminal and an output terminal. In addition, a processor coupled to the circuit is operable for calculating a parameter indicative of an error factor of the circuit by setting a level difference between an input signal at the input terminal and an output signal at the output terminal to a predetermined level.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: May 1, 2012
    Assignee: O2Micro International Limited
    Inventors: Guoxing Li, Quanwang Liu, Shiqiang Liu, Juncai Hu
  • CALIBRATING A SYSTEM BY SETTING DIFFERENCE BETWEEN SIGNALS
    Publication number: 20120013366
    Abstract: In a signal monitoring system, a circuit includes an input terminal and an output terminal. In addition, a processor coupled to the circuit is operable for calculating a parameter indicative of an error factor of the circuit by setting a level difference between an input signal at the input terminal and an output signal at the output terminal to a predetermined level.
    Type: Application
    Filed: September 23, 2011
    Publication date: January 19, 2012
    Inventors: Guoxing LI, Quanwang LIU, Shiqiang LIU, Juncai HU
  • Calculating a parameter indicative of an error factor of a circuit
    Patent number: 8030973
    Abstract: In a signal monitoring system, a circuit includes an input terminal and an output terminal. In addition, a processor coupled to the circuit is operable for calculating a parameter indicative of an error factor of the circuit by setting a level difference between an input signal at the input terminal and an output signal at the output terminal to a predetermined level.
    Type: Grant
    Filed: December 29, 2009
    Date of Patent: October 4, 2011
    Assignee: O2Micro Inc.
    Inventors: Guoxing Li, Quanwang Liu, Shiqiang Liu, Juncai Hu
  • SIGNAL MONITORING SYSTEMS
    Publication number: 20110156758
    Abstract: In a signal monitoring system, a circuit includes an input terminal and an output terminal. In addition, a processor coupled to the circuit is operable for calculating a parameter indicative of an error factor of the circuit by setting a level difference between an input signal at the input terminal and an output signal at the output terminal to a predetermined level.
    Type: Application
    Filed: December 29, 2009
    Publication date: June 30, 2011
    Inventors: Guoxing LI, Quanwang LIU, Shiqiang LIU, Juncai HU
  • Charge pump systems with adjustable frequency control
    Publication number: 20090128212
    Abstract: An electronic system includes a charge pump driver for generating an output to control an electronic element. The electronic system further includes a clock generator coupled to the charge pump driver. The clock generator can generate a clock signal to control the charge pump driver and adjust a frequency of the clock signal according to a status of the electronic element.
    Type: Application
    Filed: November 17, 2008
    Publication date: May 21, 2009
    Inventors: Quanwang Liu, Guo Xing Li, Shiqiang Liu