Patents by Inventor Harry Huazhen Chai

Harry Huazhen 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).

  • Method and motor controller for measuring magnitude of varying non-sinusoidal voltages and currents of a motor controller
    Patent number: 10530285
    Abstract: A method of controlling a motor controller includes receiving respective measurements for each of at least three phase currents or voltages output by the motor controller that were instantaneously sensed at substantially the same instant, determining a magnitude of a model signal that models the sensed phase currents or voltages at the instant of the instantaneous sensing as a function of each of the respective measurements, and controlling the motor controller based on the magnitude of the model signal. A motor controller and a controller of a motor controller using the method are also provided.
    Type: Grant
    Filed: November 5, 2018
    Date of Patent: January 7, 2020
    Assignee: Hamiton Sundstrand Corporation
    Inventors: Harry Huazhen Chai, Tyler W. Hayes
  • Compensating ripple on pulse with modulator outputs
    Patent number: 8982587
    Abstract: A ripple compensation apparatus comprises a ripple detection unit to detect a ripple on a dual DC bus, a waveform generation unit to generate a modulated waveform based on a base waveform and the detected ripple, and a multi-phase control signal generation unit to receive the modulated waveform and to generate at least one pulse width modulated control signal based on the modulated waveform.
    Type: Grant
    Filed: April 23, 2012
    Date of Patent: March 17, 2015
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Vietson M. Nguyen, Adam Michael White, Harry Huazhen Chai
  • COMPENSATING RIPPLE ON PULSE WITH MODULATOR OUTPUTS
    Publication number: 20130279216
    Abstract: A ripple compensation apparatus comprises a ripple detection unit to detect a ripple on a dual DC bus, a waveform generation unit to generate a modulated waveform based on a base waveform and the detected ripple, and a multi-phase control signal generation unit to receive the modulated waveform and to generate at least one pulse width modulated control signal based on the modulated waveform.
    Type: Application
    Filed: April 23, 2012
    Publication date: October 24, 2013
    Applicant: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Vietson M. Nguyen, Adam Michael White, Harry Huazhen Chai