Company Filing History:
3 out of 785 
1 out of 2,870 
Years Active: 1996-1999
Title: The Innovations of Li-Hsin D Lu
Introduction
Li-Hsin D Lu is a prominent inventor based in San Jose, California. She holds a total of four patents, showcasing her expertise in the field of motor drive systems and circuit design. Her innovative contributions have significantly advanced the technology surrounding brushless DC motors.
Latest Patents
One of her latest patents is titled "Circuit and method for determining optimal phase combination for startup." This invention involves a circuit designed to determine the initial winding combination for the startup of a polyphase DC motor. The circuit includes a transistor driver circuit with high side and low side winding drivers connected to two voltage sources. It utilizes a current mirror circuit and a series of sense FETs to measure the current and determine the optimal phase combination for motor startup. The system stores the phase combination that takes the longest time to reach a current threshold, ensuring efficient motor operation.
Another significant patent is "Current sensing and control in brushless DC motors." This invention describes a motor drive system that employs current mirror load current sensing. The system operates in bipolar mode during startup and switches to unipolar mode during full-speed operation. By continuously sensing the load current, the system avoids ripple in the sensed current, enhancing the performance of the motor.
Career Highlights
Li-Hsin D Lu has worked with notable companies such as SGS-Thomson Microelectronics Limited and STMicroelectronics GmbH. Her experience in these organizations has contributed to her development as an inventor and her understanding of advanced motor technologies.
Collaborations
Throughout her career, Li-Hsin D Lu has collaborated with esteemed colleagues, including Karl M Schlager and Francesco Carobolante. These partnerships have fostered innovation and the exchange of ideas in the field of electrical engineering.
Conclusion
Li-Hsin D Lu's contributions to the field of motor technology through her patents and collaborations highlight her role as a leading inventor. Her work continues to influence advancements in motor drive systems and circuit design.