Location History:
- Hitachi, JA (1978)
- Hitachi, JP (1985)
- Mito, JP (1986)
Company Filing History:
3 out of 42,522 
1 out of 2,333 
Years Active: 1978-1986
Title: Kohei Yabuno: Innovator in Power Supply Technology
Introduction
Kohei Yabuno is a notable inventor based in Hitachi, Japan. He has made significant contributions to the field of power supply technology, holding a total of 3 patents. His work focuses on innovative solutions that enhance the efficiency and functionality of power supply systems.
Latest Patents
Yabuno's latest patents include a "Switch mode power supply having magnetically controlled output." This invention features a magnetically controlled switching regulator that manages output voltage using a saturable reactor. The saturable reactor consists of a first winding for output current and a second winding for reset current. The energy for resetting the reactor is sourced from a capacitor in the smoothing circuit for the output voltage. The design ensures that the reset current does not flow through a transformer, preventing saturation and excessive temperature increases, which allows for a miniaturized transformer core and improved output voltage control.
Another significant patent is the "Switching power supply apparatus." This invention describes a power supply apparatus that includes a primary winding of a main transformer and a semiconductor device with a control electrode connected in series with a DC power source. The control electrode receives a drive current via an auxiliary transformer, and output is generated on the secondary winding of the main transformer by toggling the semiconductor device. A tertiary winding is also included to provide a negative polarity drive current to the semiconductor device when it is turned off.
Career Highlights
Throughout his career, Kohei Yabuno has worked with prominent companies such as Hitachi, Ltd. and Hitachi Metals, Ltd. His experience in these organizations has allowed him to develop and refine his innovative ideas in power supply technology.
Collaborations
Yabuno has collaborated with notable colleagues, including Kenichi Onda and Kojin Abe. Their combined expertise has contributed to advancements in the field of power supply systems.
Conclusion
Kohei Yabuno's contributions to power supply technology through his patents and collaborations highlight his role as an influential inventor. His innovative designs continue to impact the industry positively.