Patents by Inventor Caleb Secrest

Caleb Secrest 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).

  • Smooth transition control between overmodulation and six step pulse width modulation
    Patent number: 11777435
    Abstract: A method is provided for producing a smooth transition between overmodulation and six-step operation of a SVPWM-controlled 3-phase electric machine. In one aspect, the method predicts the PWM sample for which the control voltage vector will cross the middle of each SVPWM hexagon sector. Then, based on the current voltage angle and duty cycle, as well as on an estimated future voltage angle and duty cycle, an average duty cycle is calculated and inserted. In addition, a PWM carrier waveform is selected to ensure the PWM pulses applied to each period result in continuous switching states.
    Type: Grant
    Filed: May 17, 2022
    Date of Patent: October 3, 2023
    Assignee: BorgWarner Inc.
    Inventors: Yang Sun, Caleb Secrest