Patents by Inventor Tak Sang Yim

Tak Sang Yim 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: 11043847
    Abstract: A wireless charging receiver as described herein includes a configurable rectifier configured to convert an alternating current input to a direct current output in a single processing stage, wherein the configurable rectifier comprises one or more diodes, and a controller communicatively coupled to the one or more diodes and configured to select one of a plurality of mode cycling schemes and control a present operating mode of the active diodes according to a selected mode cycling scheme. Additionally, an active diode as described herein includes a comparator, a gate driver, a power transistor, and a delay compensation circuit for compensation of at least one of a turn-on delay and a turn-off delay of the active diode, the delay compensation circuit including analog feedback loops.
    Type: Grant
    Filed: September 26, 2016
    Date of Patent: June 22, 2021
    Assignee: THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Lin Cheng, Wing Hung Ki, Tak Sang Yim, Chi Ying Tsui, Yat To Wong
  • Publication number: 20190074721
    Abstract: A wireless charging receiver as described herein includes a configurable rectifier configured to convert an alternating current input to a direct current output in a single processing stage, wherein the configurable rectifier comprises one or more diodes, and a controller communicatively coupled to the one or more diodes and configured to select one of a plurality of mode cycling schemes and control a present operating mode of the active diodes according to a selected mode cycling scheme, Additionally, an active diode as described herein includes a comparator, a gate driver, a power transistor, and a delay compensation circuit for compensation of at least one of a turn-on delay and a turn-off delay of the active diode, the delay compensation circuit including analog feedback loops.
    Type: Application
    Filed: September 26, 2016
    Publication date: March 7, 2019
    Inventors: Lin CHENG, Wing Hung KI, Tak Sang YIM, Chi Ying TSUI, Yat To WONG
  • Patent number: 10075085
    Abstract: Techniques are provided to tune a gate-drive control signal for a switching device. In an aspect, a device is provided that includes a dead-time generator circuit, a first dead-time tuner circuit and a second dead-time tuner circuit. The dead-time generator circuit generates a control signal for a first switching device that is coupled to a second switching device via a switching node. The first dead-time tuner circuit generates, based on the control signal and a switching signal indicative of a voltage associated with the switching node, a first modified control signal for the first switching device. The second dead-time tuner circuit generates, based on a modified version of the switching signal and a tuning process that repeatedly modifies the control signal until a first dead-time value satisfies a defined criterion, a second modified control signal for the first switching device.
    Type: Grant
    Filed: May 23, 2016
    Date of Patent: September 11, 2018
    Assignee: THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Ziang Chen, Tak Sang Yim, Yat To Wong, Wing Hung Ki
  • Publication number: 20180131282
    Abstract: Techniques are provided to tune a gate-drive control signal for a switching device. In an aspect, a device is provided that includes a dead-time generator circuit, a first dead-time tuner circuit and a second dead-time tuner circuit. The dead-time generator circuit generates a control signal for a first switching device that is coupled to a second switching device via a switching node. The first dead-time tuner circuit generates, based on the control signal and a switching signal indicative of a voltage associated with the switching node, a first modified control signal for the first switching device. The second dead-time tuner circuit generates, based on a modified version of the switching signal and a tuning process that repeatedly modifies the control signal until a first dead-time value satisfies a defined criterion, a second modified control signal for the first switching device.
    Type: Application
    Filed: May 23, 2016
    Publication date: May 10, 2018
    Inventors: Ziang CHEN, Tak Sang YIM, Yat To WONG, Wing Hung KI
  • Patent number: 9762125
    Abstract: A differential difference amplifier Type-III compensator of a voltage-mode switching converter can be designed to help regulate an input voltage from a power source. A voltage-mode switching converter can comprise a power stage and a voltage-mode controller. A voltage-mode controller can comprise a compensator, which comprises a differential difference amplifier. The design of the differential difference amplifier Type-III compensator can reduce production costs and enhance power transfer efficiencies.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: September 12, 2017
    Assignee: THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Lin Cheng, Wing Hung Ki, Tak Sang Yim
  • Publication number: 20150236593
    Abstract: A differential difference amplifier Type-III compensator of a voltage-mode switching converter can be designed to help regulate an input voltage from a power source. A voltage-mode switching converter can comprise a power stage and a voltage-mode controller. A voltage-mode controller can comprise a compensator, which comprises a differential difference amplifier. The design of the differential difference amplifier Type-III compensator can reduce production costs and enhance power transfer efficiencies.
    Type: Application
    Filed: January 29, 2015
    Publication date: August 20, 2015
    Inventors: Lin Cheng, Wing Hung Ki, Tak Sang Yim