Patents by Inventor Alexandr Ikriannikov

Alexandr Ikriannikov 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).

  • Patent number: 10297379
    Abstract: A switching power converter includes an integrated transformer and coupled inductor, first and second primary switching circuits, and a master controller. The integrated transformer and coupled inductor includes (a) first and second primary windings electrically coupled in series and (b) first and second secondary windings. The first and second primary switching circuits are electrically coupled to an end of the first primary winding and an end of the second primary winding, respectively. The master controller is configured to determine a magnitude of magnetizing current of the integrated transformer and coupled inductor from a difference between magnitude of current flowing through the first secondary winding and magnitude of current flowing through the second secondary winding, when the first and second primary switching circuits are in their respective off-states.
    Type: Grant
    Filed: March 10, 2017
    Date of Patent: May 21, 2019
    Assignee: Maxim Integrated Products, Inc.
    Inventors: Sean Philip Gold, Alexandr Ikriannikov, Milan Dragojevic, Michael D. McJimsey
  • Patent number: 10276288
    Abstract: A coupled inductor includes a ladder magnetic core including two opposing rails extending in a lengthwise direction and joined by a plurality of rungs. The coupled inductor further includes a respective winding wound around each of the plurality of rungs. The plurality of rungs are divided into at least two groups of rungs, and a lengthwise separation distance between adjacent rungs in each group of rungs is less than a lengthwise separation distance between adjacent rungs of different groups of rungs.
    Type: Grant
    Filed: July 10, 2017
    Date of Patent: April 30, 2019
    Assignee: Volterra Semiconductor LLC
    Inventor: Alexandr Ikriannikov
  • Patent number: 10256031
    Abstract: A low-profile coupled inductor includes a magnetic core and first and second windings. The magnetic core includes first and second end flanges, a winding form element, a first outer plate, and a first leakage post. The winding form element is disposed between and connects the first and second end flanges in a first direction. The first outer plate is disposed over and faces the first and second end flanges in a second direction. The first leakage post is disposed between the winding form element and the first outer plate in the second direction. The first winding is wound around the winding form element, between the first end flange and the first leakage post, and the second winding is wound around the winding form element, between the first leakage post and the second end flange. Each of the windings is wound around a common axis extending in the first direction.
    Type: Grant
    Filed: April 5, 2018
    Date of Patent: April 9, 2019
    Assignee: Maxim Integrated Products, Inc.
    Inventors: Michael Warren Baker, Jizheng Qiu, Brett A. Miwa, Alexandr Ikriannikov
  • Patent number: 10128035
    Abstract: A coupled inductor array includes a monolithic magnetic core formed of magnetic materials having a distributed gap, first and second windings, and a low-permeability magnetic structure. The first and second windings form respective first and second winding turns around a common winding axis extending in the height direction. The low-permeability magnetic structure is embedded in the monolithic magnetic core and forms a loop around the common winding axis. The low-permeability magnetic structure separates the first and second winding turns in the height direction, and the low-permeability magnetic structure is formed of a magnetic material having a lower magnetic permeability than the one or more magnetic materials forming the monolithic magnetic core. One possible application of the coupled inductor array is in a multi-phase switching power converter.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: November 13, 2018
    Assignee: Volterra Semiconductor LLC
    Inventors: Di Yao, Alexandr Ikriannikov
  • Publication number: 20180226186
    Abstract: A low-profile coupled inductor includes a magnetic core and first and second windings. The magnetic core includes first and second end flanges, a winding form element, a first outer plate, and a first leakage post. The winding form element is disposed between and connects the first and second end flanges in a first direction. The first outer plate is disposed over and faces the first and second end flanges in a second direction. The first leakage post is disposed between the winding form element and the first outer plate in the second direction. The first winding is wound around the winding form element, between the first end flange and the first leakage post, and the second winding is wound around the winding form element, between the first leakage post and the second end flange. Each of the windings is wound around a common axis extending in the first direction.
    Type: Application
    Filed: April 5, 2018
    Publication date: August 9, 2018
    Inventors: Michael Warren Baker, Jizheng Qiu, Brett A. Miwa, Alexandr Ikriannikov
  • Patent number: 10020109
    Abstract: A switching power converter includes a first and second switching device, an air core coupled inductor, and a controller. The air core coupled inductor includes a first winding electrically coupled to the first switching device and a second winding electrically coupled to the second switching device. The first and second windings are magnetically coupled. The controller is operable to cause the first and second switching devices to repeatedly switch between their conductive and non-conductive states at a frequency of at least 100 kilohertz to cause current through the first and second windings to repeatedly cycle, thereby providing power to an output port. The switching power converter may have a topology including, but not limited to, a buck converter topology, a boost converter topology, and a buck-boost converter topology.
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: July 10, 2018
    Assignee: Volterra Semiconductor LLC
    Inventor: Alexandr Ikriannikov
  • Publication number: 20180053596
    Abstract: A coupled inductor for low electromagnetic interference includes a plurality of windings and a composite magnetic core including a coupling magnetic structure formed of a first magnetic material and a leakage magnetic structure formed of a second magnetic material having a distributed gap. The coupling magnetic structure magnetically couples together the plurality of windings, and the leakage magnetic structure provides leakage magnetic flux paths for the plurality of windings.
    Type: Application
    Filed: August 18, 2017
    Publication date: February 22, 2018
    Inventors: Alexandr Ikriannikov, Di Yao
  • Patent number: 9806523
    Abstract: A switching circuit for extracting power from an electric power source includes (1) an input port for electrically coupling to the electric power source, (2) an output port for electrically coupling to a load, (3) a first switching device configured to switch between its conductive state and its non-conductive state to transfer power from the input port to the output port, (4) an intermediate switching node that transitions between at least two different voltage levels at least in part due to the first switching device switching between its conductive state and its non-conductive state, and (5) a controller for controlling the first switching device to maximize an average value of a voltage at the intermediate switching node.
    Type: Grant
    Filed: May 18, 2015
    Date of Patent: October 31, 2017
    Assignee: Volterra Semiconductor LLC
    Inventors: Anthony J. Stratakos, Michael D. McJimsey, Ilija Jergovic, Alexandr Ikriannikov, Artin Der Minassians, Kaiwei Yao, David B. Lidsky, Marco A. Zuniga, Ana Borisavljevic
  • Publication number: 20170309382
    Abstract: A coupled inductor includes a ladder magnetic core including two opposing rails extending in a lengthwise direction and joined by a plurality of rungs. The coupled inductor further includes a respective winding wound around each of the plurality of rungs. The plurality of rungs are divided into at least two groups of rungs, and a lengthwise separation distance between adjacent rungs in each group of rungs is less than a lengthwise separation distance between adjacent rungs of different groups of rungs.
    Type: Application
    Filed: July 10, 2017
    Publication date: October 26, 2017
    Inventor: Alexandr Ikriannikov
  • Patent number: 9774259
    Abstract: A multiple-output DC-DC converter has a first and a second DC-DC sub-converter, each DC-DC subconverter may be a buck, boost, or buck-boost converter having a primary energy-storage inductor. Each DC-DC subconverter drives a separate output of the multiple-output converter and typically has a separate feedback control circuit for controlling output voltage and/or current. The converter has a common timing circuit to maintain a phase offset between the first and DC-DC subconverters. The primary energy storage inductors of the first and second DC-DC converter are magnetically coupled to raise an effective ripple frequency of the converter and simplify output filtering.
    Type: Grant
    Filed: July 7, 2014
    Date of Patent: September 26, 2017
    Assignee: Volterra Semiconductor LLC
    Inventors: Alexandr Ikriannikov, Ognjen Djekic
  • Patent number: 9767947
    Abstract: A coupled inductor includes a first end magnetic element, a second end magnetic element, N connecting magnetic elements, and N windings, where N is an integer greater than one. Each of the N connecting magnetic elements connects to both of the first and second end magnetic elements. Each of the N windings is wound around a respective one of the N connecting magnetic elements such that the N windings are wound in alternating opposing directions. Possible applications of the coupled inductor include, but are not limited to, switching power converter applications.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: September 19, 2017
    Assignee: Volterra Semiconductor LLC
    Inventor: Alexandr Ikriannikov
  • Publication number: 20170263369
    Abstract: A switching power converter includes an integrated transformer and coupled inductor, first and second primary switching circuits, and a master controller. The integrated transformer and coupled inductor includes (a) first and second primary windings electrically coupled in series and (b) first and second secondary windings. The first and second primary switching circuits are electrically coupled to an end of the first primary winding and an end of the second primary winding, respectively. The master controller is configured to determine a magnitude of magnetizing current of the integrated transformer and coupled inductor from a difference between magnitude of current flowing through the first secondary winding and magnitude of current flowing through the second secondary winding, when the first and second primary switching circuits are in their respective off-states.
    Type: Application
    Filed: March 10, 2017
    Publication date: September 14, 2017
    Inventors: Sean Philip Gold, Alexandr Ikriannikov, Milan Dragojevic, Michael D. McJimsey
  • Patent number: 9721719
    Abstract: A coupled inductor includes a ladder magnetic core, a first common leakage plate formed of a magnetic material, and N windings, where N is an integer greater than one. The ladder magnetic core includes first and second rails and N rungs, where each of the N rungs connects the first and second rails. Each of the N windings includes a respective first portion. Each of the N windings is wound around a respective one of the N rungs, and at least two of the N windings are wrapped at least partially around the first common leakage plate such that a first portion of the winding is disposed between an outer surface of the first rail and an outer surface of the first common leakage plate.
    Type: Grant
    Filed: March 9, 2015
    Date of Patent: August 1, 2017
    Assignee: Volterra Semiconductor LLC
    Inventor: Alexandr Ikriannikov
  • Patent number: 9704629
    Abstract: A coupled inductor includes a ladder magnetic core including two opposing rails extending in a lengthwise direction and joined by a plurality of rungs. The coupled inductor further includes a respective winding wound around each of the plurality of rungs. The plurality of rungs are divided into at least two groups of rungs, and a lengthwise separation distance between adjacent rungs in each group of rungs is less than a lengthwise separation distance between adjacent rungs of different groups of rungs.
    Type: Grant
    Filed: February 8, 2016
    Date of Patent: July 11, 2017
    Assignee: Volterra Semiconductor LLC
    Inventor: Alexandr Ikriannikov
  • Patent number: 9698599
    Abstract: An electric power system includes N electric power sources and N switching circuits, where N is an integer greater than one. Each switching circuit includes an input port electrically coupled to a respective one of the N electric power sources, an output port, and a first switching device adapted to switch between its conductive and non-conductive states to transfer power from the input port to the output port. The output ports of the N switching circuits are electrically coupled in series and to a load to establish an output circuit. Each of the N switching circuits uses an interconnection inductance of the output circuit as a primary energy storage inductance of the switching circuit.
    Type: Grant
    Filed: April 11, 2016
    Date of Patent: July 4, 2017
    Assignee: Volterra Semiconductor LLC
    Inventors: Anthony J. Stratakos, Michael D. McJimsey, Ilija Jergovic, Alexandr Ikriannikov, Artin Der Minassians, Kaiwei Yao, David B. Lidsky, Marco A. Zuniga, Ana Borisavljevic
  • Patent number: 9691538
    Abstract: A magnetic device includes a magnetic core, one or more first windings, and one or more second windings. Each first winding forms a respective first turn around a respective first winding center axis, and each second winding forms a respective second turn around a common second winding center axis that is orthogonal to each first winding center axis. Another magnetic device includes a magnetic core, a plurality of first windings forming respective first winding turns, and a second winding forming a second winding turn. Each first winding turn is within the second winding turn, as seen when the magnetic device is viewed cross-sectionally in a first direction. Yet another magnetic device includes a magnetic core, one or more first windings, and one or more second windings magnetically isolated from the one or more first windings.
    Type: Grant
    Filed: November 10, 2014
    Date of Patent: June 27, 2017
    Assignee: Volterra Semiconductor LLC
    Inventors: Alexandr Ikriannikov, Anthony J. Stratakos
  • Patent number: 9627125
    Abstract: Single phase inductors have non-linear inductance values, and M-phase coupled inductors having non-linear leakage inductance values. Each inductor includes, for example, at least one of the following: a saturable magnetic element, a gap of non-uniform thickness, a core formed of a distributed gap material, or a non-homogeneous core. A DC-to-DC converter includes an inductor having a non-linear inductance value, a switching subsystem, and an output filer. Another DC-to-DC converter includes an output filter, a coupled inductor having non-linear leakage inductance values, and switching subsystems.
    Type: Grant
    Filed: September 15, 2014
    Date of Patent: April 18, 2017
    Assignee: Volterra Semiconductor LLC
    Inventors: Alexandr Ikriannikov, Ognjen Djekic
  • Patent number: 9577426
    Abstract: An integrated circuit chip includes a first input port, a first output port, and first and second transistors electrically coupled in series across the first input port. The second transistor is also electrically coupled across the first output port and is adapted to provide a path for current flowing through the first output port when the first transistor is in its non-conductive state. The integrated circuit chip additionally includes first driver circuitry for driving gates of the first and second transistors to cause the transistors to switch between their conductive and non-conductive states. The integrated circuit chip further includes first controller circuitry for controlling the first driver circuitry such that the first and second transistors switch between their conductive and non-conductive states to at least substantially maximize an amount of electric power extracted from an electric power source electrically coupled to the first input port.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: February 21, 2017
    Assignee: Volterra Semiconductor LLC
    Inventors: Anthony J. Stratakos, Michael D. McJimsey, Ilija Jergovic, Alexandr Ikriannikov, Artin Der Minassians, Kaiwei Yao, David B. Lidsky, Marco A. Zuniga, Ana Borisavljevic
  • Publication number: 20170047155
    Abstract: A coupled inductor array includes a monolithic magnetic core formed of magnetic materials having a distributed gap, first and second windings, and a low-permeability magnetic structure. The first and second windings form respective first and second winding turns around a common winding axis extending in the height direction. The low-permeability magnetic structure is embedded in the monolithic magnetic core and forms a loop around the common winding axis. The low-permeability magnetic structure separates the first and second winding turns in the height direction, and the low-permeability magnetic structure is formed of a magnetic material having a lower magnetic permeability than the one or more magnetic materials forming the monolithic magnetic core. One possible application of the coupled inductor array is in a multi-phase switching power converter.
    Type: Application
    Filed: December 18, 2015
    Publication date: February 16, 2017
    Inventors: Di Yao, Alexandr Ikriannikov
  • Patent number: 9559679
    Abstract: An integrated circuit includes a semiconductor die including one or more switching circuits, a magnetic core having length and width, first and second metallic leads, and integrated circuit packaging material. The first metallic lead forms a first winding turn around a portion of the magnetic core, and the first metallic lead is electrically coupled to the semiconductor die. The second metallic lead forms a second winding turn around a portion of the magnetic core. The first and second winding turns are offset from each other along both of the width and length of the magnetic core. The integrated circuit is, for example, included in an integrated electronic assembly.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: January 31, 2017
    Assignee: Volterra Semiconductor, LLC
    Inventors: Alexandr Ikriannikov, Andrew J. Burstein, Anthony J. Stratakos