Location History:
- Dallas, TX (US) (2002)
- Plano, TX (US) (2006)
Company Filing History:
Years Active: 2002-2006
Title: Innovations by Alaa Y El-Sherif
Introduction
Alaa Y El-Sherif is a notable inventor based in Plano, TX (US). She has made significant contributions to the field of motor control systems, holding a total of 4 patents. Her work focuses on enhancing the performance and reliability of motor controllers through innovative designs.
Latest Patents
One of her latest patents is titled "Rejection of power supply variations for gain error cancellation in pulse-width-modulated motor controllers." This invention discloses a positioning driver for a voice coil motor in a disk drive system. The design incorporates pulse-width-modulated prestage drivers coupled to power transistors arranged in an 'H' bridge configuration. These drivers operate based on a comparison between an error signal from an error amplifier and a ramp clock signal generated by a ramp clock generator. The ramp clock generator includes a control circuit that modulates the high and low limits of the ramp clock signal in response to variations in the power supply voltage, effectively compensating for gain variations in the power transistors.
Another significant patent is for a "Closed-loop control system to mitigate PWM switching noise." This invention provides a motor control system that includes a linear control system operating in a linear mode to generate control signals for driving an associated motor based on an error signal. The system also features control logic that operates in a pulse-width modulation (PWM) mode, generating pulse-width-modulated signals based on the error signal. The feedback network is designed to match the transfer function characteristics in both linear and PWM modes, facilitating smooth transitions between the two modes.
Career Highlights
Alaa Y El-Sherif is currently employed at Texas Instruments Corporation, where she continues to innovate in the field of motor control systems. Her work has been instrumental in advancing technologies that improve the efficiency and effectiveness of motor operations.
Collaborations
Throughout her career, Alaa has collaborated with notable colleagues, including Kevin William Ziemer and Eugene Francis Plutowski. These collaborations have contributed to the development of her innovative patents and advancements in motor control technology.
Conclusion
Alaa Y El-Sherif is a pioneering inventor whose work in motor control systems has led to significant advancements in the field. Her patents reflect her commitment to innovation and her ability to address complex challenges in technology.