Patents by Inventor Mehdi Mohammadi

Mehdi Mohammadi 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).

  • Synchronous rectification of LLC converters based on homopolarity
    Patent number: 11159090
    Abstract: Synchronous rectification methods and algorithms, and polarity sensing techniques, based on the homopolarity cycle concept for conduction loss reduction in LLC resonant converters are provided. In a half bridge rectifier configuration, one of rectifier switches is switched ON when the polarity of the inverter and rectifier voltages are both positive and the other rectifier switch is switched ON when both polarities are negative.
    Type: Grant
    Filed: May 29, 2020
    Date of Patent: October 26, 2021
    Assignees: ALPHA TECHNOLOGIES LTD., The University of British Columbia
    Inventors: Mehdi Mohammadi, Martin Ordonez, Mohammad Mahdavi, Peter Ksiazek, Navid Shafiei, Rahul Khandekar
  • Multipurpose viscous damper
    Patent number: 10858791
    Abstract: The present invention relates to a multipurpose viscous damper (100), comprising: an outer cylinder (101); a core rod (102) positioned in the outer cylinder (101); a core piston (103) positioned in the middle and surrounded the core rod (102); a plurality of bypass pipes (104) extending along the outer cylinder (101), each bypass pipe (104) being connected to the outer cylinder (101) adjacent to the two ends of the outer cylinder (101); an orifice controller (105) located on the bypass pipes (104) for providing initial adjustable damping during low to moderate vibration; and characterized by a pair of inner cylinders (106) positioned inside the two ends of the core rod (102); an inner piston (107) positioned in each inner cylinder (106); a fixed sealing (108) located at the two end of each of the inner cylinders (106); and an orifice (109) located at the two ends of the inner cylinder (106) for allowing fluid flowing from the inner cylinder (106) to the outer cylinder (101) during movement of inner piston (10
    Type: Grant
    Filed: April 18, 2019
    Date of Patent: December 8, 2020
    Assignee: Universiti Putra Malaysia
    Inventors: Farzad Hejazi, Mohd Saleh Bin Jaafar, Mehdi Mohammadi
  • SYNCHRONOUS RECTIFICATION OF LLC CONVERTERS BASED ON HOMOPOLARITY
    Publication number: 20200382012
    Abstract: Synchronous rectification methods and algorithms, and polarity sensing techniques, based on the homopolarity cycle concept for conduction loss reduction in LLC resonant converters are provided. In a half bridge rectifier configuration, one of rectifier switches is switched ON when the polarity of the inverter and rectifier voltages are both positive and the other rectifier switch is switched ON when both polarities are negative.
    Type: Application
    Filed: May 29, 2020
    Publication date: December 3, 2020
    Applicants: ALPHA TECHNOLOGIES LTD., THE UNIVERSITY OF BRITSH COLUMBIA
    Inventors: Peter KSIAZEK, Navid SHAFIEI, Rahul KHANDEKAR, Mehdi MOHAMMADI, Martin ORDONEZ, Mohammad MAHDAVI
  • MULTIPURPOSE VISCOUS DAMPER
    Publication number: 20190323183
    Abstract: The present invention relates to a multipurpose viscous damper (100), comprising: an outer cylinder (101); a core rod (102) positioned in the outer cylinder (101); a core piston (103) positioned in the middle and surrounded the core rod (102); a plurality of bypass pipes (104) extending along the outer cylinder (101), each bypass pipe (104) being connected to the outer cylinder (101) adjacent to the two ends of the outer cylinder (101); an orifice controller (105) located on the bypass pipes (104) for providing initial adjustable damping during low to moderate vibration; and characterized by a pair of inner cylinders (106) positioned inside the two ends of the core rod (102); an inner piston (107) positioned in each inner cylinder (106); a fixed sealing (108) located at the two end of each of the inner cylinders (106); and an orifice (109) located at the two ends of the inner cylinder (106) for allowing fluid flowing from the inner cylinder (106) to the outer cylinder (101) during movement of inner piston (10
    Type: Application
    Filed: April 18, 2019
    Publication date: October 24, 2019
    Applicant: Universiti Putra Malaysia
    Inventors: Farzad Hejazi, Mohd Saleh Bin Jaafar, Mehdi Mohammadi