Patents by Inventor Harry Chai

Harry Chai 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).

  • System for and method of controlling inrush current between a power source and a load
    Patent number: 10847970
    Abstract: A system for controlling inrush current between a power source and a load includes an output capacitor configured to be coupled in parallel with the load. The system also includes a transistor having a gate, a collector configured to be coupled to the power source, and an emitter configured to be coupled to the load. The system also includes a collector resistor coupled between the collector of the transistor and the gate of the transistor. The system also includes an emitter capacitor coupled between the gate of the transistor and the emitter of the transistor to facilitate current flow from the power source through the collector resistor and the emitter capacitor to charge the output capacitor.
    Type: Grant
    Filed: January 19, 2018
    Date of Patent: November 24, 2020
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Frank Z. Feng, Randall Bax, Ryan W. Schmid, Huazhen (Harry) Chai
  • System for controlling inrush current between a power source and a load
    Patent number: 10833502
    Abstract: A system for controlling inrush current between a power source and a load includes an output capacitor coupled in parallel with the load, and a transistor having a gate, a collector configured to be coupled to the power source, and an emitter configured to be coupled to the load. The system also includes a supply resistor configured to be electrically coupled between the power source and the load and to provide a resistor charging current from the power source to the output capacitor to charge the output capacitor in response to initial power being provided by the power source. The system also includes a gate resistor having a first terminal coupled to the gate of the transistor to cause the transistor to operate in a linear mode in response to the initial power being provided by the power source to increase a speed of charging the output capacitor.
    Type: Grant
    Filed: January 19, 2018
    Date of Patent: November 10, 2020
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Frank Z. Feng, Randall Bax, Ryan W. Schmid, Huazhen (Harry) Chai
  • Integration of inductor and damper for power filters
    Patent number: 10453603
    Abstract: An inductor damper circuit includes a toroidal inductor having an inductor coil and an inductor housing, and a resistive element configured around a periphery of the inductor coil and having one end connected to the toroidal inductor, where the resistive element is printed on a flexible substrate and configured between the inductor coil and the inductor housing, and the resistive element is integrated with the toroidal inductor.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: October 22, 2019
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Harry Chai, Eric A. Carter, John Huss
  • SYSTEM FOR CONTROLLING INRUSH CURRENT BETWEEN A POWER SOURCE AND A LOAD
    Publication number: 20190229527
    Abstract: A system for controlling inrush current between a power source and a load includes an output capacitor coupled in parallel with the load, and a transistor having a gate, a collector configured to be coupled to the power source, and an emitter configured to be coupled to the load. The system also includes a supply resistor configured to be electrically coupled between the power source and the load and to provide a resistor charging current from the power source to the output capacitor to charge the output capacitor in response to initial power being provided by the power source. The system also includes a gate resistor having a first terminal coupled to the gate of the transistor to cause the transistor to operate in a linear mode in response to the initial power being provided by the power source to increase a speed of charging the output capacitor.
    Type: Application
    Filed: January 19, 2018
    Publication date: July 25, 2019
    Applicant: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Frank Z. Feng, Randall Bax, Ryan W. Schmid, Huazhen (Harry) Chai
  • SYSTEM FOR AND METHOD OF CONTROLLING INRUSH CURRENT BETWEEN A POWER SOURCE AND A LOAD
    Publication number: 20190229524
    Abstract: A system for controlling inrush current between a power source and a load includes an output capacitor configured to be coupled in parallel with the load. The system also includes a transistor having a gate, a collector configured to be coupled to the power source, and an emitter configured to be coupled to the load. The system also includes a collector resistor coupled between the collector of the transistor and the gate of the transistor. The system also includes an emitter capacitor coupled between the gate of the transistor and the emitter of the transistor to facilitate current flow from the power source through the collector resistor and the emitter capacitor to charge the output capacitor.
    Type: Application
    Filed: January 19, 2018
    Publication date: July 25, 2019
    Applicant: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Frank Z. Feng, Randall Bax, Ryan W. Schmid, Huazhen (Harry) Chai
  • INTEGRATION OF INDUCTOR AND DAMPER FOR POWER FILTERS
    Publication number: 20170372835
    Abstract: An inductor damper circuit includes a toroidal inductor having an inductor coil and an inductor housing, and a resistive element configured around a periphery of the inductor coil and having one end connected to the toroidal inductor, where the resistive element is printed on a flexible substrate and configured between the inductor coil and the inductor housing, and the resistive element is integrated with the toroidal inductor.
    Type: Application
    Filed: June 28, 2016
    Publication date: December 28, 2017
    Inventors: Harry Chai, Eric A. Carter, John Huss