Location History:
- Kawagoe, JA (1977)
- Kawagoe, JP (1986 - 1996)
- Tsurugashima, JP (1992 - 1996)
Company Filing History:
6 out of 180 
3 out of 61 
2 out of 5 Years Active: 1977-1996
Title: Koji Arakawa: Innovating Power Conversion Technologies
Introduction
Koji Arakawa, a prominent inventor based in Tsurugashima, Japan, has made significant contributions to power conversion technologies. With a remarkable portfolio of 10 patents to his name, Arakawa's innovations focus primarily on enhancing the efficiency and performance of AC-DC converters.
Latest Patents
One of Arakawa's notable patents is an advanced AC-DC converter designed to improve power factor while minimizing voltage distortion and higher harmonics in power supply lines. This invention achieves its goals without complicating the circuit arrangement. A step-down DC-DC converter is effectively integrated with an output side rectifier, allowing current to flow solely when the rectifier's output voltage exceeds the capacitor voltage of the DC-DC converter.
Another significant innovation is his AC-DC converter featuring an improved power factor. This design prevents the burdens of increased loads on the circuit components due to AC input fluctuations, which helps reduce both the size and cost of the device. Arakawa's system includes a constant-current circuit connected to a voltage dividing point of an output capacitor's charge voltage, enabling stable operation irrespective of AC voltage levels.
Career Highlights
Throughout his career, Koji Arakawa has worked with well-known companies such as Toko, Inc. and Toko Kabushiki Kaisha, where he developed his innovative solutions. His dedication to research and development in power electronics has positioned him as a leading figure in the field.
Collaborations
Arakawa has collaborated with several skilled professionals, including Shigeru Kameyama and Kazushi Watanabe. Their joint efforts have propelled advancements in the AC-DC conversion sector, emphasizing the importance of teamwork in technological innovation.
Conclusion
Koji Arakawa's contributions to power conversion technology reflect his commitment to improving efficiency and functionality in electrical systems. His patents demonstrate a blend of innovation and practicality that continues to influence the industry, representing the work of a dedicated inventor at the forefront of technological advancement.