Location History:
- Drapers Meadow, VA (US) (1988)
- Blacksburg, VA (US) (1988)
- Drapers Meadow, Blacksburg, VA (US) (1988)
- Sunnyvale, CA (US) (2007 - 2015)
- New Taipei, TW (2015)
Company Filing History:
7 out of 7 
1 out of 785 
1 out of 2 
Years Active: 1988-2015
Title: Kwang-Hwa Liu: Innovator in LED Technology
Introduction
Kwang-Hwa Liu is a prominent inventor based in Sunnyvale, CA, known for his significant contributions to LED technology. With a total of 14 patents, Liu has made remarkable advancements in the field of lighting and power conversion.
Latest Patents
One of Liu's latest patents is for an LED lighting driver. This innovative driver includes a bridge rectifier, multiple LED sections, shunt regulators, a weighted current mirror array, a mean power integrator, and a reference generator. The bridge rectifier provides a rectified sinusoidal voltage, while the LED sections are coupled in series to this voltage. Each shunt regulator manages a shunt current flowing from the LED sections based on a current reference value. The weighted current mirror array generates multiple copy currents that track the conduction time of each shunt regulator and the instantaneous output power of the LED sections. The mean power integrator calculates a mean power value by integrating these copy currents, and the reference generator provides current reference values that are proportional to the difference between a mean power reference value and the mean power value.
Another notable patent is for a control device for a multiphase interleaved DC-DC converter and its control method. This disclosure outlines a control method for an interleaved multiphase Boost PFC converter, which consists of a master phase and several slave phases. The master phase operates in critical conduction mode, while each slave phase is equipped with an inductor and a power switch. The control method involves configuring the phase difference between the master and slave phases, ensuring that each slave phase operates in critical conduction mode, and monitoring their operating modes during system disturbances. Adjustments to the power switch on time of the slave phase are made to maintain critical conduction mode.
Career Highlights
Throughout his career, Kwang-Hwa Liu has worked with various companies, including Green Mark Technology Inc. His work has significantly impacted the development of efficient lighting solutions and power conversion technologies.
Collaborations
Liu has collaborated with notable professionals in the field, including Fred C. Lee and Cheng-Nan Wu. These collaborations have further enhanced his innovative contributions to technology.
Conclusion
Kwang-Hwa Liu is a distinguished inventor whose work in LED technology and power conversion has led to numerous patents and advancements in the industry. His