Chang Qian

Title: Chang Qian: Innovator in Power Conversion Technologies

Introduction

Chang Qian is a notable inventor based in Palo Alto, CA, who has made significant contributions to the field of power conversion technologies. With a total of 3 patents to his name, he has developed innovative solutions that enhance the efficiency and functionality of power systems.

Latest Patents

One of Chang Qian's latest patents is titled "Resonant converter with synchronous rectifier feedback." This invention includes a system comprising an inductance, a sensing circuit, a filter circuit, and a switch. The inductance connects to both the output of a power supply supplying a DC voltage and a load, while the sensing circuit is designed to monitor the voltage at a specific node. The filter circuit processes this voltage, outputting a filtered version, and the switch manages current flow through the load based on the filtered voltage.

Another significant patent is the "Bleeder method using switch node coupling capacitor for TRIAC dimming of solid state lighting." This invention describes power converters equipped with bleeder circuits. In this embodiment, a controllable TRIAC works in conjunction with a rectifier to produce a controllable rectified voltage. The design includes a first inductor, a load capacitor, control circuitry for switching a transistor, and a bleeder circuit that features a resistor in series with a coupling capacitor.

Career Highlights

Chang Qian is currently employed at Marvell International Limited, where he continues to innovate in the field of power electronics. His work focuses on developing advanced technologies that improve power efficiency and control in various applications.

Collaborations

Throughout his career, Chang has collaborated with talented individuals such as Young Chul Ryu and Wanfeng Zhang. These partnerships have contributed to the successful development of his patented technologies.

Conclusion

Chang Qian's contributions to power conversion technologies through his innovative patents demonstrate his expertise and commitment to advancing the field. His work continues to influence the development of efficient power systems.