Location History:
- Drachten, NL (1990 - 1992)
- Oss, NL (2000 - 2002)
Company Filing History:
4 out of 14,087 
1 out of 3 
1 out of 21,376 
Years Active: 1990-2002
Title: Innovations of Johannes E Algra
Introduction
Johannes E Algra is a notable inventor based in Drachten, Netherlands. He has made significant contributions to the field of semiconductor technology, particularly in the design of circuits for light sources. With a total of 5 patents, his work has had a considerable impact on the industry.
Latest Patents
One of his latest patents is a power circuit for a semiconductor light source operable from a solid state relay. This circuit is designed to receive electrical power from a switched source, such as a solid state relay, and provide the necessary power to a semiconductor light source. The design includes a rectifier circuit and an interference filter connected in series between the input connections and the converter, which supplies the required voltage and current for the light source. To ensure proper operation, the circuit is free from capacitive elements between the input terminals and the rectifier circuit. The interference filter is ideally placed between the rectifier and the converter. This light source can be utilized as a signal light, and the circuit can be integrated into the housing of the signal light.
Another significant patent involves a circuit arrangement for operating a semiconductor light source. This arrangement features connection terminals for a control unit, an input filter, and a converter with a control circuit. It also includes output terminals for connecting the semiconductor light source, an apparatus for removing leakage current in the control unit, and a self-regulating circuit for deactivating this apparatus. Additionally, a detection circuit is incorporated to identify any malfunctioning of the converter or the light source by monitoring minimum and maximum voltage levels at the output terminals.
Career Highlights
Throughout his career, Johannes E Algra has worked with prominent companies such as U.S. Philips Corporation and Lumileds Lighting B.V. His experience in these organizations has allowed him to refine his skills and contribute to innovative projects in the lighting industry.
Collaborations
He has collaborated with notable individuals in the field, including Joseph A Plagge and Marcel J Bucks. These partnerships have further enhanced his work and led to advancements in semiconductor technology.
Conclusion
Johannes E Algra's contributions to the field of semiconductor light sources demonstrate his innovative spirit and technical expertise. His patents reflect a commitment to improving technology in lighting applications.