Patents by Inventor Alex Hartular

Alex Hartular 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).

  • Power supply topology
    Patent number: 7977911
    Abstract: A power supply system can include a primary power supply coupled to an output, and a secondary power supply coupled to the output. The primary power supply provides power to the output when a voltage level of the secondary power supply is less than a first predetermined level. The secondary power supply provides power to the output when the voltage level of the secondary power supply is greater than the first predetermined level. The secondary power supply not only provides power to the output, but also charges the primary power supply when the voltage level of the secondary power supply is greater than a second predetermined level that is greater than the first predetermined level.
    Type: Grant
    Filed: October 1, 2007
    Date of Patent: July 12, 2011
    Assignee: O2 Micro, Inc.
    Inventors: Stefan Maireanu, Alex Hartular, Chun Lu, Jianping Xu, Xinhe Su, Xiaodong Wang
  • Circuits and methods for battery charging
    Patent number: 7750604
    Abstract: Circuits and methods for battery charging are disclosed. In one embodiment, the battery charging circuit comprises an AC to DC converter, a charging control switch, and a charger controller. The AC to DC converter provides a charging power to a battery pack. The charging control switch is coupled between the AC to DC converter and the battery pack. The charging control switch transfers the charging power to the battery pack. The charger controller detects a battery status of the battery pack and controls the charging control switch to charge the battery pack in a continuous charging mode or a pulse charging mode according to the battery status. The charger controller also controls the AC to DC converter to regulate the charging power according to the battery status.
    Type: Grant
    Filed: September 7, 2007
    Date of Patent: July 6, 2010
    Assignee: O2Micro, Inc.
    Inventors: Alex Hartular, Eftimie Caraghiorghiopol, Dan Simion
  • Circuits and methods for battery charging
    Publication number: 20080197811
    Abstract: Circuits and methods for battery charging are disclosed. In one embodiment, the battery charging circuit comprises an AC to DC converter, a charging control switch, and a charger controller. The AC to DC converter provides a charging power to a battery pack. The charging control switch is coupled between the AC to DC converter and the battery pack. The charging control switch transfers the charging power to the battery pack. The charger controller detects a battery status of the battery pack and controls the charging control switch to charge the battery pack in a continuous charging mode or a pulse charging mode according to the battery status. The charger controller also controls the AC to DC converter to regulate the charging power according to the battery status.
    Type: Application
    Filed: September 7, 2007
    Publication date: August 21, 2008
    Inventors: Alex Hartular, Eftimie Caraghiorghiopol, Dan Simion
  • Power supply topology
    Publication number: 20080191557
    Abstract: A power supply system can include a primary power supply coupled to an output, and a secondary power supply coupled to the output. The primary power supply provides power to the output when a voltage level of the secondary power supply is less than a first predetermined level. The secondary power supply provides power to the output when the voltage level of the secondary power supply is greater than the first predetermined level. The secondary power supply not only provides power to the output, but also charges the primary power supply when the voltage level of the secondary power supply is greater than a second predetermined level that is greater than the first predetermined level.
    Type: Application
    Filed: October 1, 2007
    Publication date: August 14, 2008
    Applicant: O2Micro Inc.
    Inventors: Stefan Maireanu, Alex Hartular, Chun Lu, Jianping Xu, Xinhe Su, Xiaodong Wang