Patents by Inventor Serban Popescu

Serban Popescu 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).

  • Circuits and methods for controlling a converter
    Patent number: 7816896
    Abstract: Circuits and methods for controlling a converter are disclosed. A first switch within the converter can be turned off, and a second switch within the converter alternately can be turned on and off in response to a switch control signal while the first switch is turned off. By turning the second switch alternately on and off, energy stored in the converter can be recovered to a power source of the converter.
    Type: Grant
    Filed: September 14, 2007
    Date of Patent: October 19, 2010
    Assignee: 02Micro International Limited
    Inventors: Laszlo Lipcsei, Serban Popescu, ChengHwa Teh
  • Buck topology allowing step-up and polarity change
    Patent number: 7659702
    Abstract: A buck topology that provides voltage step up and polarity change is disclosed. In one embodiment a converter includes an input for receiving an input voltage, a switching circuit coupled to the input for receiving a first driving signal, a floating voltage source coupled to the switching circuit for producing an offset voltage, and an output coupled to the floating voltage source for generating an output voltage. The output voltage exhibits a voltage level that is directly proportional to a duty cycle of the first driving signal.
    Type: Grant
    Filed: March 29, 2007
    Date of Patent: February 9, 2010
    Assignee: O2Micro International Limited
    Inventors: Laszlo Lipcsei, Serban Popescu, Sorin Hornet
  • VOLTAGE REGULATOR WITH COTROL OF SWITCHING ELEMENTS
    Publication number: 20080252272
    Abstract: A regulator comprises an output terminal producing a regulated output voltage, a first comparator, a second comparator, a first sourcing circuit coupled to the output terminal, and a first sinking circuit coupled to the output terminal. The first comparator compares a feedback signal representative of the output voltage and a first sourcing reference signal that is less than a reference signal. The second comparator compares the feedback signal and a first sinking reference signal that is greater than the reference signal. The first sourcing circuit is configured to be responsive to the first comparator by sourcing a first current to the output terminal. The first sinking circuit is configured to be responsive to the second comparator by sinking a second current from the output terminal.
    Type: Application
    Filed: June 23, 2008
    Publication date: October 16, 2008
    Applicant: O2MICRO, INC.
    Inventors: Laszlo Lipcsei, Serban Popescu, ChengHwa Teh
  • Switching resistance linear regulator architecture
    Patent number: 7391191
    Abstract: A switching resistance linear regulator. The regulator comprises an output terminal producing a regulated output voltage, a first comparator, a second comparator, a first sourcing circuit coupled to the output terminal, and a first sinking circuit coupled to the output terminal. The first comparator compares a feedback signal representative of the output voltage and a first sourcing reference signal that is less than a reference signal. The second comparator compares the feedback signal and a first sinking reference signal that is greater than the reference signal. The first sourcing circuit is configured to be responsive to the first comparator by sourcing a first current to the output terminal. The first sinking circuit is configured to be responsive to the second comparator by sinking a second current from the output terminal.
    Type: Grant
    Filed: October 2, 2006
    Date of Patent: June 24, 2008
    Assignee: O2 Micro International Limited
    Inventors: Laszlo Lipcsei, Serban Popescu, ChengHwa Teh
  • Circuits and methods for controlling a converter
    Publication number: 20080101102
    Abstract: Circuits and methods for controlling a converter are disclosed. A first switch within the converter can be turned off, and a second switch within the converter alternately can be turned on and off in response to a switch control signal while the first switch is turned off. By turning the second switch alternately on and off, energy stored in the converter can be recovered to a power source of the converter.
    Type: Application
    Filed: September 14, 2007
    Publication date: May 1, 2008
    Inventors: Laszlo Lipcsei, Serban Popescu, ChengHwa Teh
  • Switching resistance linear regulator architecture
    Publication number: 20080079403
    Abstract: A switching resistance linear regulator. The regulator comprises an output terminal producing a regulated output voltage, a first comparator, a second comparator, a first sourcing circuit coupled to the output terminal, and a first sinking circuit coupled to the output terminal. The first comparator compares a feedback signal representative of the output voltage and a first sourcing reference signal that is less than a reference signal. The second comparator compares the feedback signal and a first sinking reference signal that is greater than the reference signal. The first sourcing circuit is configured to be responsive to the first comparator by sourcing a first current to the output terminal. The first sinking circuit is configured to be responsive to the second comparator by sinking a second current from the output terminal.
    Type: Application
    Filed: October 2, 2006
    Publication date: April 3, 2008
    Inventors: Laszlo Lipcsei, Serban Popescu, ChengHwa Teh
  • Buck topology allowing step-up and polarity change
    Publication number: 20070285066
    Abstract: A buck topology that provides voltage step up and polarity change is disclosed. In one embodiment a converter includes an input for receiving an input voltage, a switching circuit coupled to the input for receiving a first driving signal, a floating voltage source coupled to the switching circuit for producing an offset voltage, and an output coupled to the floating voltage source for generating an output voltage. The output voltage exhibits a voltage level that is directly proportional to a duty cycle of the first driving signal.
    Type: Application
    Filed: March 29, 2007
    Publication date: December 13, 2007
    Inventors: Laszlo Lipcsei, Serban Popescu, Sorin Hornet