Company Filing History:
Years Active: 2014-2019
Title: Joseph James Roosma: Innovator in IGBT Technology
Introduction
Joseph James Roosma is a notable inventor based in Santa Clara, California. He has made significant contributions to the field of electrical engineering, particularly in the development of Insulated Gate Bipolar Transistor (IGBT) technology. With a total of three patents to his name, Roosma's work focuses on enhancing the efficiency and reliability of electronic components.
Latest Patents
One of Roosma's latest patents is for an IGBT assembly that features a saturable inductor for soft landing a diode recovery current. This innovative combination switch includes an IGBT, an anti-parallel diode, and a saturable inductor. The diode and inductor are connected in series between the collector and emitter of the IGBT. The design allows the inductor to exit saturation when the forward bias current through the diode falls below a certain level. As the diode current decreases, it initially drops rapidly until the inductor current reaches the saturation level. Subsequently, the diode current decreases at a slower rate, enabling a soft landing to zero current. This mechanism effectively reduces voltage and current spikes that could otherwise occur during operation. Multiple methods for implementing and manufacturing the saturable inductor are also disclosed in the patent.
Career Highlights
Joseph James Roosma is currently employed at IXYS Corporation, where he continues to innovate in the field of power electronics. His expertise in IGBT technology has positioned him as a key player in the development of advanced electronic systems.
Collaborations
Roosma collaborates with Kyoung Wook Seok, a fellow innovator in the field. Their combined efforts contribute to the advancement of technology in power electronics.
Conclusion
Joseph James Roosma's contributions to IGBT technology demonstrate his commitment to innovation in electrical engineering. His patents reflect a deep understanding of electronic components and their applications. Roosma's work continues to influence the industry, paving the way for future advancements.