Weiguang Qiu

Title: Weiguang Qiu and His LED Driver Patent

Introduction

Weiguang Qiu is an inventor associated with Fremont, California, and Micrel, Incorporated. His patent work addresses LED driver performance, including circuit protection and brightness control.

Latest Patents

The provided information identifies one patent associated with Qiu: “LED Driver with Fast Open Circuit Protection, Short Circuit Compensation, and Rapid Brightness Control Response.” The invention describes a driver for one or more strings of series-connected LEDs. It uses feedback from a sense resistor and an operational amplifier to regulate peak current through a MOSFET, while a pulse-width modulation signal controls LED brightness.

The design also uses a boost regulator to supply the LED string. Its controller responds to open-circuit conditions by promptly decoupling from the regulator’s switching transistor. When an LED shorts, the regulator lowers its output voltage and the brightness-control duty cycle increases automatically. The stated portfolio comprises 1 patent.

Career Highlights

Qiu’s listed company affiliation is Micrel, Incorporated. The patent reflects work on improving LED driver protection and responsiveness, particularly under open-circuit and short-circuit conditions.

Collaborations

Qi Deng is identified as Qiu’s coworker. The information provided does not specify a particular role for Deng in the patent.

Conclusion

Weiguang Qiu’s identified patent focuses on making LED drivers more responsive to circuit faults while maintaining effective current regulation and brightness control.