Patents by Inventor S. M. Ahsanuzzaman

S. M. Ahsanuzzaman 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).

  • SENSORLESS SELF-TUNING DIGITAL CURRENT PROGRAMMED MODE (CPM) CONTROLLER WITH MULTIPLE PARAMETER ESTIMATION AND THERMAL STRESS EQUALIZATION
    Publication number: 20120223692
    Abstract: A multiphase controller for a DC-to-DC power supply includes logic to estimate parameters for multiple phases that provide a combined output at a load. The estimated parameters include a current estimate and an effective resistance estimates for each phase so that a power estimate for each phase can be produced. The logic adjusts the operation of the phases using the power estimate for each phase.
    Type: Application
    Filed: March 3, 2011
    Publication date: September 6, 2012
    Applicant: EXAR CORPORATION
    Inventors: ALEKSANDAR PRODIC, ZDRAVKO LUKIC, S M AHSANUZZAMAN, ZHENYU ZHAO
  • SELF-TUNING SENSORLESS DIGITAL CURRENT-MODE CONTROLLER WITH ACCURATE CURRENT SHARING FOR MULTIPHASE DC-DC CONVERTERS
    Publication number: 20100141230
    Abstract: Embodiments of the present invention concern a multiphase switch-mode power supply. The multiple phase switch-mode power supply can have at least one switch and a digital controller to control the switching of the at least one switch. During a calibration period, the digital controller can freeze the current of all of the multiple phases except for a phase being calibrated. This can be done by fixing the current reference of the phases except for the phase being calibrated.
    Type: Application
    Filed: July 6, 2009
    Publication date: June 10, 2010
    Applicant: EXAR CORPORATION
    Inventors: Zdravko Lukic, S M. Ahsanuzzaman, Aleksandar Prodic
  • ESR ZERO ESTIMATION AND AUTO-COMPENSATION IN DIGITALLY CONTROLLED BUCK CONVERTERS
    Publication number: 20100117615
    Abstract: One embodiment of the present invention is a digitally controlled DC-DC converter comprising of a power stage including at least one switch and an output capacitor. A digital controller can control the switching of the at least one switch. The digital controller can include logic to produce an indication related to a zero resulting from the equivalent series resistance (ESR) of the output capacitor and to update the control of the switching of the switch in the power stage based on the estimate.
    Type: Application
    Filed: July 21, 2009
    Publication date: May 13, 2010
    Applicant: EXAR CORPORATION
    Inventors: Aleksandar Prodic, ZHENYU ZHAO, S. M. AHSANUZZAMAN
  • SELF-TUNING DIGITAL CURRENT ESTIMATOR FOR LOW-POWER SWITCHING CONVERTERS
    Publication number: 20090267582
    Abstract: A switched mode power can use a digital controller to control the switching of the at least one switch of the switched mode power supply. The current through the power inductor can be estimated using a self-tuning digital current estimator.
    Type: Application
    Filed: April 14, 2009
    Publication date: October 29, 2009
    Applicant: EXAR CORPORATION
    Inventors: Aleksandar Prodic, Zdravko Lukic, Zhenyu Zhao, S. M. Ahsanuzzaman