Patents Represented by Attorney Theadore E. Galanthay

Find this attorney in the Justia Lawyer Directory

  • BEMF crossing detection in PWM mode operation for sensorless motor control application
    Patent number: 5789895
    Abstract: A method and a circuit for detecting zero crossing points for a brushless, sensorless, three-phase DC motor operated in a PWM mode. The circuit senses a BEMF signal in a floating coil and generates a first signal when the BEMF signal is separated from the center tap voltage by a selected offset voltage amount. The circuit overrides the PWM mode and drives a high side driving transistor to a conducting state until the zero crossing point is detected.
    Type: Grant
    Filed: December 12, 1996
    Date of Patent: August 4, 1998
    Assignee: SGS-Thomson Microelectronics Inc.
    Inventor: Eugene C. Lee