Patents by Inventor Bharatkumar K. PATEL

Bharatkumar K. PATEL 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).

  • Shoot-through prevention in switched-mode power supplies
    Patent number: 9768703
    Abstract: The disclosed embodiments provide a system that operates a flyback converter. During activation of a synchronous rectifier (SR) controller on a secondary side of the power converter, the system temporarily disables driving of a gate of a metal-oxide-semiconductor field-effect transistor (MOSFET) by the SR controller to enable synchronization of the SR controller to a switching frequency on a primary side of the power converter. After driving of the gate of the MOSFET by the SR controller has been disabled for a pre-specified period, the system enables driving of the gate of the MOSFET by the SR controller.
    Type: Grant
    Filed: December 30, 2015
    Date of Patent: September 19, 2017
    Assignee: Apple Inc.
    Inventors: Zaohong Yang, Bharatkumar K. Patel, Bogdan T. Bucheru, Juan Carlos Pastrana
  • SHOOT-THROUGH PREVENTION IN SWITCHED-MODE POWER SUPPLIES
    Publication number: 20160190948
    Abstract: The disclosed embodiments provide a system that operates a flyback converter. During activation of a synchronous rectifier (SR) controller on a secondary side of the power converter, the system temporarily disables driving of a gate of a metal-oxide-semiconductor field-effect transistor (MOSFET) by the SR controller to enable synchronization of the SR controller to a switching frequency on a primary side of the power converter. After driving of the gate of the MOSFET by the SR controller has been disabled for a pre-specified period, the system enables driving of the gate of the MOSFET by the SR controller.
    Type: Application
    Filed: December 30, 2015
    Publication date: June 30, 2016
    Inventors: Zaohong Yang, Bharatkumar K. Patel, Bogdan T. Bucheru, Juan Carlos Pastrana
  • Controlling a current drawn from an adapter by a computer system
    Patent number: 9134775
    Abstract: The disclosed embodiments provide an apparatus that controls a current drawn from an adapter by a computer system. During operation, the apparatus senses the current drawn from the adapter using a first current sensor and a second current sensor, wherein a response time of the first current sensor is faster than a response time of the second current sensor. Then, when the current sensed using the first current sensor exceeds a predetermined high-current threshold, the apparatus limits the current drawn from the adapter to a first predetermined current limit. Additionally, when the current sensed using the second current sensor exceeds a predetermined thermal-limit current, the apparatus limits the current drawn from the adapter to the predetermined thermal-limit current.
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: September 15, 2015
    Assignee: Apple Inc.
    Inventors: Mao Ye, Bharatkumar K. Patel, Kisun Lee, Manisha P. Pandya, Shimon Elkayam
  • Low dielectric photoimageable compositions and electronic devices made therefrom
    Patent number: 8871425
    Abstract: This invention relates generally to silicon based photoresist compositions that can be used in forming low k dielectric constant materials suitable for use in electronic devices, methods of their use and the electronic devices made therefrom.
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: October 28, 2014
    Assignee: AZ Electronic Materials (Luxembourg) S.A.R.L.
    Inventors: Ruzhi Zhang, Jihoon Kim, Bharatkumar K. Patel, Elizabeth Wolfer
  • CONTROLLING A FLYBACK CONVERTER FOR USE WITH A COMPUTER SYSTEM
    Publication number: 20130229832
    Abstract: The disclosed embodiments provide an apparatus that controls a flyback converter for use with a computer system. During operation, the apparatus senses an output voltage and output current of the flyback converter. The apparatus then switches a mode for controlling the flyback converter from a discontinuous mode to a continuous mode based on the sensed output voltage and the sensed output current.
    Type: Application
    Filed: June 6, 2012
    Publication date: September 5, 2013
    Applicant: APPLE INC.
    Inventors: Bharatkumar K. Patel, Abby Cherian, Manisha P. Pandya, Prasad S. Joshi
  • CONTROLLING A CURRENT DRAWN FROM AN ADAPTER BY A COMPUTER SYSTEM
    Publication number: 20130227319
    Abstract: The disclosed embodiments provide an apparatus that controls a current drawn from an adapter by a computer system. During operation, the apparatus senses the current drawn from the adapter using a first current sensor and a second current sensor, wherein a response time of the first current sensor is faster than a response time of the second current sensor. Then, when the current sensed using the first current sensor exceeds a predetermined high-current threshold, the apparatus limits the current drawn from the adapter to a first predetermined current limit. Additionally, when the current sensed using the second current sensor exceeds a predetermined thermal-limit current, the apparatus limits the current drawn from the adapter to the predetermined thermal-limit current.
    Type: Application
    Filed: May 22, 2012
    Publication date: August 29, 2013
    Applicant: APPLE INC.
    Inventors: Mao Ye, Bharatkumar K. Patel, Kisun Lee, Manisha P. Pandya, Shimon Elkayam
  • LOW DIELECTRIC PHOTOIMAGEABLE COMPOSITIONS AND ELECTRONIC DEVICES MADE THEREFROM
    Publication number: 20130209754
    Abstract: This invention relates generally to silicon based photoresist compositions that can be used in forming low k dielectric constant materials suitable for use in electronic devices, methods of their use and the electronic devices made therefrom.
    Type: Application
    Filed: February 9, 2012
    Publication date: August 15, 2013
    Applicant: AZ ELECTRONIC MATERIALS USA CORP.
    Inventors: Ruzhi ZHANG, Jihoon KIM, Bharatkumar K. PATEL, Elizabeth WOLFER