Location History:
- Buchun, KR (1997)
- Puch'eon, KR (1998)
- Puncheon, KR (1999)
- Kyungki-do, KR (1998 - 2001)
- Bucheon, KR (2001)
Company Filing History:
6 out of 131,500 
3 out of 354 
1 out of 4 Years Active: 1997-2001
Title: **The Innovations of Nak-Choon Choi: A Pioneer in Electronic Ballasts**
Introduction
Nak-Choon Choi is a distinguished inventor based in Kyungki-do, South Korea, recognized for his significant contributions to the field of electronic ballasts. With a total of 10 patents to his name, Choi continues to innovate and revolutionize the way we manage lighting systems.
Latest Patents
Among his latest inventions is a remarkable electronic ballast featuring a stable reference voltage and multifunction input for soft dimming and ON/OFF control. This design incorporates a voltage reference generator that utilizes a series of current amplifiers and resistors with nearly identical resistance characteristics. Such a setup ensures stability in response to temperature changes and resistance variations. Importantly, this ballast also includes an ON/OFF controller and dimming functions controlled via a singular input terminal. The design harnesses a capacitor that mitigates abrupt changes in input signals from influencing the frequency of feedback used to control output frequency effectively.
Another of his cutting-edge patents is an electronic ballast system that includes a lamp driving circuit equipped with a pulse-width modulated signal generator and a power controller. The power controller employs a current sense resistor to detect the current flowing through the lamp and uses an operational amplifier circuit to compare this signal against a reference voltage that denotes desired lamp current. This sophisticated system allows for automatic correction of the timing capacitor to regulate the duty cycle of the pulse-width modulated signal generator, thus enhancing the performance of the lighting system.
Career Highlights
Throughout his career, Nak-Choon Choi has worked for esteemed companies such as Samsung Electronics and Fairchild Korea Semiconductor, where he honed his skills and broadened his expertise in electronic engineering and design.
Collaborations
Choi's journey also includes collaborations with talented colleagues like Maeng-Ho Seo and Dae-Bong Kim, further showcasing the innovative spirit that thrives within the collaboration-centric environments of his workplaces.
Conclusion
As a pioneering inventor, Nak-Choon Choi has significantly impacted the landscape of electronic ballasts with his inventive solutions that enhance lighting technology. His patents continue to influence the industry, illustrating the invaluable role of innovation in advancing our everyday technologies.