This inventor holds 7 USPTO granted patents. Top assignees: O2micro International Limited, Philips Electronics North America Corporation, Micro International Limited. Active years: 1998-2003.
Company Filing History:
2 out of 224 
2 out of 838 
1 out of 6 Years Active: 1998-2003
Title: Innovations of John Chou
Introduction
John Chou is a notable inventor based in Monterey Park, CA (US). He holds a total of 7 patents that showcase his contributions to the field of lamp technology. His innovative designs have significantly impacted the efficiency and functionality of lighting systems.
Latest Patents
One of his latest patents is the "Lamp Driving Topology." This invention includes a lamp driving system that features a first impedance and a second impedance connected to the secondary side of a transformer. The second impedance has a phase-shifted value compared to the first impedance. This design allows two lamp loads to be connected in series and in parallel to the first and second impedances and the transformer. The phase shift ensures that the transformer does not need to supply double the striking voltage to ignite the series-connected lamps. Additionally, a difference in resistance between the first and second impedances guarantees that the lamps ignite in a specified sequence.
Another significant patent is the "Integrated Circuit for Lamp Heating and Dimming Control." This electronic ballast for lamps or tubes includes a ballast controller with filament heating circuitry and dimming circuitry. The filament heating circuitry features preheat dimming circuits that preheat the filaments for a predetermined time before striking the lamp. The steady-state heating circuitry continually heats the filaments during the lamp's operation. This circuitry is designed to heat the filaments inversely proportional to the desired dimming value of the lamp. The dimming circuitry can include conventional analog dimming and burst mode dimming, providing a wide range of dimming characteristics for the lamp.
Career Highlights
John Chou has worked with several prominent companies, including O2micro International Limited and Philips Electronics North America Corporation. His experience in these organizations has allowed him to develop and refine his innovative ideas in lighting technology.
Collaborations
Throughout his career, John has collaborated with talented individuals such as Yongping Xia and Yung-Lin Lin. These partnerships have contributed to the advancement of his inventions and the overall progress in the field.
Conclusion
John Chou's contributions to lamp technology through his patents demonstrate his innovative spirit and dedication to improving lighting systems. His work continues to influence the industry and inspire future advancements in technology.