Patents by Inventor Huazhen (Harry) Chai

Huazhen (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).

  • 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
  • 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
  • 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
  • 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