Company Filing History:
16 out of 1,452 
1 out of 832,680 Years Active: 2006-2019
Title: The Innovative Contributions of Andrew Johnsen
Introduction
Andrew Johnsen is a notable inventor based in Danvers, MA (US), recognized for his significant contributions to the field of solid-state lighting and electronic circuits. With a total of 17 patents to his name, Johnsen has developed innovative technologies that enhance the efficiency and functionality of lighting systems.
Latest Patents
Among his latest patents is the "Multi String Controller with Independent Current Setting for Each String." This invention is designed for solid-state lighting applications and allows for the regulation of multiple channels of LEDs. Each string can have a different forward voltage and current setting, ensuring optimal performance. The controller integrates a constant buck regulator to manage the total current supplied to the LED output channels. Additionally, it features a feedback loop that precisely controls the current through each string, making it resilient to transient conditions.
Another significant patent is the "Active Damping Circuit." This circuit includes a peak current limiter, a drain source voltage limiter, a turn-on driver, a resistor shunt circuit, and a peak current sensor. The peak current sensor detects the rising edge of an input voltage from a phase cut dimmer by identifying a higher peak current. This mechanism drives a collector voltage of a second transistor low, which in turn lowers the gate voltage of a first transistor, allowing it to function as a damping resistor. The circuit is designed to respond effectively to changes in peak current, ensuring reliable operation.
Career Highlights
Throughout his career, Andrew Johnsen has worked with various companies, including Osram Sylvania Inc. His experience in the industry has allowed him to develop and refine his innovative ideas, contributing to advancements in lighting technology.
Collaborations
Johnsen has collaborated with notable professionals in his field, including Vipin C Madhani and Glenn Freeman. These collaborations have fostered an environment of innovation and creativity, leading to the development of groundbreaking technologies.
Conclusion
Andrew Johnsen's contributions to the field of solid-state lighting and electronic circuits are significant and impactful. His innovative patents and collaborations highlight his dedication to advancing technology in this area. His work continues to influence the industry and inspire future innovations.
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.