Patents by Inventor Duleepa Jayanath Thrimawithana

Duleepa Jayanath Thrimawithana 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).

  • Publication number: 20200106303
    Abstract: The present invention relates to a AC-AC converter, which has particular relevance to a converter for an inductive or capacitive (wireless) power transfer system. More specifically, the current invention discloses an AC-AC converter comprising a bridge circuit having a first leg and a second leg, each leg including a high switch and a low switch, the high switches being connected to a first energy source and the low switches being connected to ground, a coupling network(s) having a first connection between the switches of the first leg and a second connection between the switches of the second leg, a second (or multiple secondary) energy source(s) connected between the coupling network(s) and ground.
    Type: Application
    Filed: March 28, 2018
    Publication date: April 2, 2020
    Inventors: Duleepa Jayanath Thrimawithana, Udaya Kumara Madawala, Gaurav Rajesh Kalra, Baljit Singh Riar, Martin Neuburger, Steven Ian Ruddell, Regan Andrew Zane
  • Publication number: 20190348866
    Abstract: A polyphase inductive power transfer system primary or secondary apparatus includes a magnetic coupling coil associated with each phase and a compensation network associated with each magnetic coupling coil for providing power to or receiving power from the respective coil. At least one of the compensation networks has a different power transfer characteristic to one or more of the other compensation networks.
    Type: Application
    Filed: December 5, 2017
    Publication date: November 14, 2019
    Inventors: Udaya Kumara Madawala, Duleepa Jayanath Thrimawithana, Lei Zhao, Patrick Aiguo Hu, Yuan Song
  • Patent number: 10432026
    Abstract: A method is provided for controlling the output voltage of a pickup in an inductive power transfer (IPT) system without any additional form of communications for feedback from the pickup to the power supply. The method comprising the steps of deriving an estimate of the output voltage of the pickup from the voltage across the primary conductive path, and adjusting the current in the primary conductive path so that the estimated pickup output voltage matches a required pickup output voltage. In particular, an estimate of the pickup output voltage is derived from the magnitude and phase angle of the voltage in the primary conductive path.
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: October 1, 2019
    Assignee: Auckland UniServices Limited
    Inventors: Udaya Kumara Madawala, Duleepa Jayanath Thrimawithana
  • Patent number: 10270289
    Abstract: The present invention provides a polyphase inductive power transfer (IPT) system comprising a primary power supply comprising a plurality of primary conductors, the primary conductors being individually selectively operable to provide or receive a magnetic field for inductive power transfer; and at least one pick-up comprising one or more pick-up conductors, the one or more pick-up conductors each being individually selectively operable to magnetically couple with a primary conductor to control power transfer between the primary power supply and a load coupled or coupleable with the respective pick-up. The polyphase primary power supply may be used to power a plurality of single-phase pick-ups, one or more polyphase pick-ups, or a combination thereof. Also disclosed are polyphase primary and secondary converters for use in such a system.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: April 23, 2019
    Assignee: Auckland UniServices Limited
    Inventors: Udaya Kumara Madawala, Duleepa Jayanath Thrimawithana
  • Patent number: 10243409
    Abstract: A control method for use in a primary side power converter (1) of an inductive power transfer (IPT) system. The power transfer from the primary side to one or more secondary pick-ups is monitored, and the operating frequency of the primary side power converter (1) is varied in proportion to a difference between the monitored power transfer and a power capability of the primary side power converter. The frequency variation can be sensed by the or each pick-up (2) to regulate the power transfer and to prevent overloading from occurring.
    Type: Grant
    Filed: April 13, 2017
    Date of Patent: March 26, 2019
    Assignee: Auckland UniServices Limited
    Inventors: Udaya Kumara Madawala, Duleepa Jayanath Thrimawithana
  • Patent number: 10075086
    Abstract: An IPT system for wireless power transfer is provided, in particular an IPT system capable of operating at high frequencies. In one aspect there is provided an IPT transmitter comprising a push-pull resonant converter having a resonant frequency and configured to operate at a switching frequency below the resonant frequency and dependent on a switching characteristic of a second converter configured to inductively couple to said transmitter.
    Type: Grant
    Filed: April 2, 2015
    Date of Patent: September 11, 2018
    Assignee: Auckland UniServices Limited
    Inventors: Udaya Kumara Madawala, Duleepa Jayanath Thrimawithana
  • Publication number: 20180233953
    Abstract: An inductive power transfer system primary or secondary circuit has a first compensation network and second compensation network. The compensation networks each have a different power transfer characteristic with respect to relative movement of the primary or secondary magnetic flux coupling structures. The power transfer characteristics are such that one compensates for the other to allow a smooth or constant overall power transfer is despite the relative movement.
    Type: Application
    Filed: August 5, 2016
    Publication date: August 16, 2018
    Inventors: Duleepa Jayanath Thrimawithana, Udaya Kumara Madawala, Grant Anthony Covic, Lei Zhao
  • Publication number: 20180212471
    Abstract: An IPT primary or secondary circuit includes a converter connected to a primary energy source and a compensation network. A supplementary energy source is connected to the compensation network and the converter transfers energy between the primary energy source or another IPT primary or secondary circuit and the supplementary energy source.
    Type: Application
    Filed: July 20, 2016
    Publication date: July 26, 2018
    Inventors: Martin Neuburger, Duleepa Jayanath Thrimawithana, Udaya Kumara Madawala, Baljit Singh Riar, Steven Ian Ruddell, Gaurav Rajesh Kalra
  • Publication number: 20170323721
    Abstract: An inductive power transfer OPT system) includes an AC-AC full-bridge converter (Tp1-Tp4) provided between the primary conductive path (Lpt) and an alternating current power supply (Vin). The system may include a controller for controlling the pick-up device to shape the input current drawn from the alternating current power supply (Vin).
    Type: Application
    Filed: March 3, 2017
    Publication date: November 9, 2017
    Inventors: Udaya Kumara MADAWALA, Duleepa Jayanath THRIMAWITHANA
  • Publication number: 20170229918
    Abstract: A control method for use in a primary side power converter (1) of an inductive power transfer (IPT) system. The power transfer from the primary side to one or more secondary pick-ups is monitored, and the operating frequency of the primary side power converter (1) is varied in proportion to a difference between the monitored power transfer and a power capability of the primary side power converter. The frequency variation can be sensed by the or each pick-up (2) to regulate the power transfer and to prevent overloading from occurring.
    Type: Application
    Filed: April 13, 2017
    Publication date: August 10, 2017
    Inventors: Udaya Kumara Madawala, Duleepa Jayanath Thrimawithana
  • Publication number: 20170222488
    Abstract: A wireless power transfer apparatus has a resonant circuit electrically coupled to a power converter. The resonant circuit includes a magnetic coupler Lpt for magnetic coupling with a second apparatus. A controller associated with the power converter is configured to vary a relative phase of operation of the power converter with respect to the second apparatus, the phase being varied to at least partially compensate for variations in a resonant frequency of the resonant circuit.
    Type: Application
    Filed: August 11, 2015
    Publication date: August 3, 2017
    Inventors: Udaya Kumara Madawala, Duleepa Jayanath Thrimawithana
  • Patent number: 9660702
    Abstract: A control method for use in a primary side power converter (1) of an inductive power transfer (IPT) system. The power transfer from the primary side to one or more secondary pick-ups is monitored, and the operating frequency of the primary side power converter (1) is varied in proportion to a difference between the monitored power transfer and a power capability of the primary side power converter. The frequency variation can be sensed by the or each pick-up (2) to regulate the power transfer and to prevent overloading from occurring.
    Type: Grant
    Filed: June 27, 2012
    Date of Patent: May 23, 2017
    Assignee: Auckland UniServices Limited
    Inventors: Udaya Kumara Madawala, Duleepa Jayanath Thrimawithana
  • Patent number: 9653207
    Abstract: An inductive power transfer (IPT system) includes an AC-AC full-bridge converter (Tp1-Tp4) provided between the primary conductive path (Lpt) and an alternating current power supply (Vin). The system may include a controller for controlling the pick-up device to shape the input current drawn from the alternating current power supply (Vin).
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: May 16, 2017
    Assignee: AUCKLAND UNISERVICES LIMITED
    Inventors: Udaya Kumara Madawala, Duleepa Jayanath Thrimawithana
  • Publication number: 20170033693
    Abstract: The present invention relates to an IPT system for wireless power transfer, in particular an IPT system capable of operating at high frequencies. In one aspect there is provided an IPT transmitter comprising: a push-pull resonant converter having a resonant frequency; and configured to operate at a switching frequency below the resonant frequency and dependent on a switching characteristic of a second converter configured to inductively couple to said transmitter.
    Type: Application
    Filed: April 2, 2015
    Publication date: February 2, 2017
    Inventors: Udaya Kumara Madawala, Duleepa Jayanath Thrimawithana
  • Publication number: 20170018974
    Abstract: A method is provided for controlling the output voltage of a pickup in an inductive power transfer (IPT) system without any additional form of communications for feedback from the pickup to the power supply. The method comprising the steps of deriving an estimate of the output voltage of the pickup from the voltage across the primary conductive path, and adjusting the current in the primary conductive path so that the estimated pickup output voltage matches a required pickup output voltage. In particular, an estimate of the pickup output voltage is derived from the magnitude and phase angle of the voltage in the primary conductive path.
    Type: Application
    Filed: September 30, 2016
    Publication date: January 19, 2017
    Inventors: Udaya Kumara Madawala, Duleepa Jayanath Thrimawithana
  • Patent number: 9461480
    Abstract: A method is provided for controlling the output voltage of a pickup in an inductive power transfer (IPT) system without any additional form of communications for feedback from the pickup to the power supply. The method comprising the steps of deriving an estimate of the output voltage of the pickup from the voltage across the primary conductive path, and adjusting the current in the primary conductive path so that the estimated pickup output voltage matches a required pickup output voltage. In particular, an estimate of the pickup output voltage is derived from the magnitude and phase angle of the voltage in the primary conductive path.
    Type: Grant
    Filed: December 29, 2014
    Date of Patent: October 4, 2016
    Assignee: Auckland UniServices Limited
    Inventors: Udaya Kumara Madawala, Duleepa Jayanath Thrimawithana
  • Publication number: 20150207335
    Abstract: The present invention provides a polyphase inductive power transfer (IPT) system comprising a primary power supply comprising a plurality of primary conductors, the primary conductors being individually selectively operable to provide or receive a magnetic field for inductive power transfer; and at least one pick-up comprising one or more pick-up conductors, the one or more pick-up conductors each being individually selectively operable to magnetically couple with a primary conductor to control power transfer between the primary power supply and a load coupled or coupleable with the respective pick-up. The polyphase primary power supply may be used to power a plurality of single-phase pick-ups, one or more polyphase pick-ups, or a combination thereof. Also disclosed are polyphase primary and secondary converters for use in such a system.
    Type: Application
    Filed: August 28, 2013
    Publication date: July 23, 2015
    Applicant: Duleepa Jayanath Thrimawithana
    Inventors: Udaya Kumara Madawala, Duleepa Jayanath Thrimawithana
  • Publication number: 20150188320
    Abstract: A method is provided for controlling the output voltage of a pickup in an inductive power transfer (IPT) system without any additional form of communications for feedback from the pickup to the power supply. The method comprising the steps of deriving an estimate of the output voltage of the pickup from the voltage across the primary conductive path, and adjusting the current in the primary conductive path so that the estimated pickup output voltage matches a required pickup output voltage. In particular, an estimate of the pickup output voltage is derived from the magnitude and phase angle of the voltage in the primary conductive path.
    Type: Application
    Filed: December 29, 2014
    Publication date: July 2, 2015
    Inventors: Udaya Kumara Madawala, Duleepa Jayanath Thrimawithana
  • Patent number: 8923015
    Abstract: A method is provided for controlling the output voltage of a pickup in an inductive power transfer (IPT) system without any additional form of communications for feedback from the pickup to the power supply. The method comprising the steps of deriving an estimate of the output voltage of the pickup from the voltage across the primary conductive path, and adjusting the current in the primary conductive path so that the estimated pickup output voltage matches a required pickup output voltage. In particular, an estimate of the pickup output voltage is derived from the magnitude and phase angle of the voltage in the primary conductive path.
    Type: Grant
    Filed: November 26, 2009
    Date of Patent: December 30, 2014
    Assignee: Auckland UniServices Limited
    Inventors: Udaya Kumara Madawala, Duleepa Jayanath Thrimawithana
  • Publication number: 20140203659
    Abstract: A control method for use in a primary side power converter (1) of an inductive power transfer (IPT) system. The power transfer from the primary side to one or more secondary pick-ups is monitored, and the operating frequency of the primary side power converter (1) is varied in proportion to a difference between the monitored power transfer and a power capability of the primary side power converter. The frequency variation can be sensed by the or each pick-up (2) to regulate the power transfer and to prevent overloading from occurring.
    Type: Application
    Filed: June 27, 2012
    Publication date: July 24, 2014
    Applicant: Auckland UniServices Limited
    Inventors: Udaya Kumara Madawala, Duleepa Jayanath Thrimawithana