Company Filing History:
Years Active: 1992-1993
Title: Innovations of James A Thomsen, Jr.
Introduction
James A Thomsen, Jr. is a notable inventor based in Chicago, IL (US). He has made significant contributions to the field of electronic controllers for fluorescent lamps. With a total of 2 patents to his name, Thomsen's work has advanced the technology used in lighting systems.
Latest Patents
Thomsen's latest patents focus on innovative fluorescent lamp controllers. The first patent describes an electronic controller that includes a DC to AC converter, which supplies high-frequency current to the lamps. This controller features a preconditioner stage with a switched mode power supply that accepts line power and produces a DC input for the converter. The synchronization of the switched mode power supply and the DC to AC converter ensures they operate in a fixed phase relationship and/or at the same frequency.
The second patent details a controller that operates during the pre-ignition and ignition phases to achieve stable and reliable control of a half-bridge DC-AC converter. This converter operates in a frequency range offset from the resonant frequency of an output circuit that includes a transformer and capacitors, coupling the converter to a fluorescent lamp load. The converter receives a DC voltage from a switched-mode DC-DC supply of a pre-conditioner circuit, which responds to a full-wave rectified AC voltage. The controller monitors signals from the output and pre-conditioner circuits to ensure reliable starting and efficient lamp operation.
Career Highlights
James A Thomsen, Jr. is currently employed at North American Philips Corporation, where he continues to innovate in the field of electronic lighting solutions. His work has been instrumental in enhancing the efficiency and reliability of fluorescent lighting systems.
Collaborations
Thomsen has collaborated with notable coworkers, including Mark W Fellows and John M Wong, contributing to the advancement of technology in their field.
Conclusion
James A Thomsen, Jr. is a distinguished inventor whose work in fluorescent lamp controllers has made a significant impact on lighting technology. His innovative patents reflect his commitment to improving efficiency and reliability in electronic lighting systems.