This inventor holds 32 USPTO granted patents, primarily in Power Supply Technology. Top assignees: Hitachi, Ltd., Hitachi Computer Peripherals Co., Ltd., Hitachi Device Eng. Co., Ltd.. Active years: 1978-2007.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile
Location History:
- Hitachi, JA (1978)
- Hitachi-shi, JP (1988)
- Hitachi, JP (1978 - 2007)
Company Filing History:
25 out of 42,740 
3 out of 67 
1 out of 6 
Years Active: 1978-2007
Areas of Expertise:
Title: **The Innovations of Norikazu Tokunaga: A Pioneer in Power Supply Technology**
Introduction
Norikazu Tokunaga, located in Hitachi, Japan, is a prolific inventor with an impressive portfolio of 32 patents to his name. His contributions primarily focus on advancements in power supply technologies, addressing critical challenges in efficiency and functionality.
Latest Patents
Among his latest innovations is a **Backup Power Supply** design, which aims to reduce the capacity of the AC-DC converter during peak loads, resulting in both cost reduction and a smaller power unit. This system features a built-in backup power supply that utilizes a secondary battery to share part of the load current during peak demand. It incorporates a two-way DC-DC converter that allows for efficient charging and discharging, adapting dynamically to the state of charge (SOC) of the secondary battery as well as the load pattern.
Another significant invention is a **Power Supply with Uninterruptible Function**, which includes an AC/DC converter that transforms AC power into DC power for reliable output. This system also features a DC/DC converter that maintains specific output voltage levels required by the load, supported by a DC power storage mechanism that ensures continued operation during interruptions.
Career Highlights
Norikazu Tokunaga has had an impactful career, particularly working with Hitachi, Ltd., where he developed many of his groundbreaking inventions. His role in advancing power supply technologies showcases his commitment to innovation and excellence in his field.
Collaborations
Throughout his career, Tokunaga has collaborated with esteemed colleagues such as Kenichi Onda and Ryouhei Saga. Together, they have worked on projects that enhance the reliability and efficiency of power systems, contributing to the evolution of modern electrical engineering.
Conclusion
Norikazu Tokunaga stands out as a significant inventor in the realm of power supply technologies. His continuous innovations, evidenced by his numerous patents, reflect his dedication to improving electrical systems, making him a notable figure in the field of engineering. His inventions not only demonstrate technical prowess but also a keen awareness of the changing needs within the industry.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile