Patents by Inventor Brett A. Miwa

Brett A. Miwa 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: 20160247627
    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: September 28, 2015
    Publication date: August 25, 2016
    Inventors: Michael Warren Baker, Jizheng Qui, Brett A. Miwa, Alexandr Ikriannikov
  • Patent number: 9373438
    Abstract: A coupled inductor array has length, width, and height. The coupled inductor array includes a monolithic magnetic core formed of a magnetic material having a distributed gap, and a plurality of windings embedded in the monolithic magnetic core. Each winding forms a respective winding loop of one or more turns around a respective winding axis, and each winding axis extends in the height direction. Areas of the monolithic magnetic core enclosed by the winding loops are greater than areas of the monolithic magnetic core outside of the winding loops, as seen when the coupled inductor array is viewed cross-sectionally in the height direction. One possible application of the coupled inductor array is in a multi-phase switching power converter.
    Type: Grant
    Filed: March 6, 2014
    Date of Patent: June 21, 2016
    Assignee: Volterra Semiconductor LLC
    Inventors: Alexandr Ikriannikov, Ilija Jergovic, Andrew Burstein, Serhii Mikhailovich Zhak, Brett A. Miwa, Jizheng Qiu, Michael W. Baker, Justin Michael Burkhart, Xin Zhou
  • Patent number: 9276470
    Abstract: A system includes a multi-phase switching converter and a converter control module. The multi-phase switching converter receives an input voltage and that supplies an output voltage to a load via a plurality of phases. Each phase includes a plurality of switches, an on-time generator module that determines an on-time of the switches, and a switch control module that controls a switching frequency of the switches based on the on-time and a clock signal, and an inductance that connects the switches to the load. The converter control module varies the switching frequency without varying the on-time or varies the on-time without varying the switching frequency when current through the load varies.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: March 1, 2016
    Assignee: Maxim Integrated Products, Inc.
    Inventors: Xin Zhou, Serhii M. Zhak, Brett A. Miwa
  • Patent number: 9172305
    Abstract: A DC-to-DC converter includes first and second switches connected to each other at a node and biased by PWM pulses. A timing module determines a first time difference between a first edge of a first signal at the node and a first edge of a second signal at a control terminal of the first switch, and a second time difference between a second edge of the first signal and a second edge of the second signal. The first and second edges of the second signal correspond to first and second edges of one of the PWM pulses, respectively. A delay module delays the first and second edges of the second signal based on the first and second time differences, respectively. The delay module delays an edge of one of the PWM pulses based on an amount of change in a voltage output by a charge pump.
    Type: Grant
    Filed: January 12, 2015
    Date of Patent: October 27, 2015
    Assignee: MAXIM INTEGRATED PRODUCTS, INC.
    Inventors: Serhii M. Zhak, Brett A. Miwa
  • Patent number: 9166442
    Abstract: A system includes a voltage regulator module, a voltage comparator module, and a current limiting module. The voltage regulator module regulates an input voltage supplied by a power supply and supplies an output current to a load. The voltage comparator module compares the input voltage to a first threshold. The current limiting module decreases the output current when the input voltage decreases to less than or equal to the first threshold, decreases the output current until the input voltage increases to greater than the first threshold, and decreases the output current by an additional predetermined amount after the input voltage increases to greater than the first threshold.
    Type: Grant
    Filed: September 17, 2012
    Date of Patent: October 20, 2015
    Assignee: MAXIM INTEGRATED PRODUCTS, INC.
    Inventors: Mark A. Belch, Kevin Dowdy, Sean Lai, Brett Miwa, David Harrington, David Stearns, Oscar Blyde, Rui Liu
  • Publication number: 20150123632
    Abstract: A DC-to-DC converter includes first and second switches connected to each other at a node and biased by PWM pulses. A timing module determines a first time difference between a first edge of a first signal at the node and a first edge of a second signal at a control terminal of the first switch, and a second time difference between a second edge of the first signal and a second edge of the second signal. The first and second edges of the second signal correspond to first and second edges of one of the PWM pulses, respectively. A delay module delays the first and second edges of the second signal based on the first and second time differences, respectively. The delay module delays an edge of one of the PWM pulses based on an amount of change in a voltage output by a charge pump.
    Type: Application
    Filed: January 12, 2015
    Publication date: May 7, 2015
    Inventors: Serhii M. Zhak, Brett A. Miwa
  • Patent number: 8933679
    Abstract: A DC-to-DC converter includes first and second transistors that are connected in series between a supply voltage and ground and that are driven by PWM pulses. A junction of the transistors is connected to an inductance that is connected in series to a load. A first timing module determines a first time difference between a first edge of a first signal at the junction and a first edge of a second signal at a control terminal of the first transistor. A second timing module determines a second time difference between a second edge of the first signal and a second edge of the second signal. The first and second edges of the second signal respectively correspond to first and second edges of one of the PWM pulses. A delay module delays the first and second edges of the second signal respectively based on the first and second time differences.
    Type: Grant
    Filed: November 19, 2012
    Date of Patent: January 13, 2015
    Assignee: Maxim Integrated Products, Inc.
    Inventors: Serhii M. Zhak, Brett A. Miwa
  • Publication number: 20140266134
    Abstract: A control circuit for a step-up converter includes a soft start module configured to control states of N transistor pairs of the step-up converter, where N is an integer greater than two. A driver module is in communication with the soft start module and configured to generate a first signal when N transistor pairs of the step-up converter are ready to switch. A first charging circuit is configured to charge (N?1) capacitors of the step-up converter to an input voltage of the step-up converter in response to the first signal and to generate a second signal when charging is complete. A second charging circuit is configured to sequentially charge the (N?1) capacitors of the step-up converter to (N?1) predetermined voltage values in response to the first signal and the second signal and before operation of the step-up converter begins.
    Type: Application
    Filed: March 14, 2014
    Publication date: September 18, 2014
    Applicant: Maxim Integrated Products, Inc.
    Inventors: Serhii Mikhailovich Zhak, Mark Anthony Belch, Brett A. Miwa, David Harrington, Jonathan King
  • Publication number: 20140266135
    Abstract: A multi-level, step-up converter circuit includes an inductor including one terminal in communication with an input voltage supply. N transistor pairs are connected in series, where N is an integer greater than one. First and second transistors of a first pair of the N transistor pairs are connected together at a node. The node is in communication with another terminal of the inductor. Third and fourth transistors of a second pair of the N transistor pairs are connected to the first and second transistors, respectively. (N?1) capacitors have terminals connected between the N transistor pairs, respectively. An output capacitor has a terminal in communication with at least one transistor of the N transistor pair.
    Type: Application
    Filed: March 14, 2014
    Publication date: September 18, 2014
    Applicant: Maxim Integrated Products, Inc.
    Inventors: Serhii Mikhailovich Zhak, Mark Anthony Belch, Brett A. Miwa, David Harrington, Jonathan King
  • Publication number: 20140062433
    Abstract: A system includes a multi-phase switching converter and a converter control module. The multi-phase switching converter receives an input voltage and that supplies an output voltage to a load via a plurality of phases. Each phase includes a plurality of switches, an on-time generator module that determines an on-time of the switches, and a switch control module that controls a switching frequency of the switches based on the on-time and a clock signal, and an inductance that connects the switches to the load. The converter control module varies the switching frequency without varying the on-time or varies the on-time without varying the switching frequency when current through the load varies.
    Type: Application
    Filed: June 28, 2013
    Publication date: March 6, 2014
    Inventors: Xin Zhou, Serhii M. Zhak, Brett A. Miwa
  • Publication number: 20070285065
    Abstract: A step-up/step-down switching regulator control method for a regulator having an inductor with first and second leads, a first switch for controllably coupling the first lead to a source of power, a first device between the first lead and a circuit ground, a second switch for controllably coupling the second lead to the circuit ground, and a second device between the second lead and a regulator, the method comprising operating the switches in a sequence of phases when the source of power has a voltage exceeding the regulator output and in the same sequence of phases when the source of power has a voltage less than the regulator output, the phases being phase 1 with the first and second switches closed, phase 2 with the first switch closed and the second switch open, and phase 3 with both switches open. The first and second devices may be switches or diodes. Various embodiments are disclosed.
    Type: Application
    Filed: June 3, 2005
    Publication date: December 13, 2007
    Inventors: Jeffrey Summit, Brett Miwa, Karl Volk
  • Patent number: 7298119
    Abstract: A step-up/step-down switching regulator control method for a regulator having an inductor with first and second leads, a first switch for controllably coupling the first lead to a source of power, a first device between the first lead and a circuit ground, a second switch for controllably coupling the second lead to the circuit ground, and a second device between the second lead and a regulator, the method comprising operating the switches in a sequence of phases when the source of power has a voltage exceeding the regulator output and in the same sequence of phases when the source of power has a voltage less than the regulator output, the phases being phase 1 with the first and second switches closed, phase 2 with the first switch closed and the second switch open, and phase 3 with both switches open. The first and second devices may be switches or diodes. Various embodiments are disclosed.
    Type: Grant
    Filed: June 3, 2005
    Date of Patent: November 20, 2007
    Assignee: Maxim Integrated Products, Inc.
    Inventors: Jeffrey Lewis Amram Summit, Brett A. Miwa, Karl Richard Volk