Wen Chao Qu

Title: Innovations by Wen Chao Qu in Stepper Motor Control Systems

Introduction

Wen Chao Qu is an accomplished inventor based in Plano, TX (US). She has made significant contributions to the field of motor control systems, particularly through her innovative patent related to stepper motors. Her work focuses on enhancing the efficiency and accuracy of motor control, which is crucial in various applications.

Latest Patents

Wen Chao Qu holds a patent for a "Microstepper motor control circuit PWM output coupled to H-bridge gates." This stepper motor control system includes mechanisms for error reduction. The system utilizes first and second power switches to energize and de-energize a stepper motor coil during each cycle, effectively pulse-width modulating (PWM) the coil current. During cycles that include a zero crossing microstep, a calibrator detects the body diode effect occurring in the second power switch when it ceases de-energizing the coil. The selected offset is adjusted based on this detection, which controls the trigger time for a comparator that compares an offset reference voltage to a motor voltage developed in response to the coil current. This progressive adjustment over successive cycles compensates for delays in the PWM control loop, thereby reducing errors caused by variations in process, voltage, and temperature.

Career Highlights

Wen Chao Qu 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 rely on precise motor control.

Collaborations

Wen has collaborated with notable colleagues, including Sooping Saw and Anuj Jain, who have contributed to her projects and innovations.

Conclusion

Wen Chao Qu's contributions to stepper motor control systems exemplify her dedication to innovation and excellence in engineering. Her patent reflects a significant advancement in the field, showcasing her expertise and commitment to improving technology.