Hirofumi Yamaguchi

Title: Hirofumi Yamaguchi: Innovator in Battery-Charging Technology

Introduction

Hirofumi Yamaguchi is a notable inventor based in Numazu, Japan. He has made significant contributions to the field of battery-charging devices and power source technology. With a total of 4 patents to his name, Yamaguchi continues to push the boundaries of innovation in electrical engineering.

Latest Patents

One of Yamaguchi's latest inventions is a battery-charging device that utilizes a full-bridge rectifier circuit. This device features MOSFETs that rectify the output of a magnet-type AC generator. It includes an ON/OFF state establishment mechanism that determines the operational state of each MOSFET based on the polarity of the input terminals. Additionally, it has a during-charging FET control system that aligns the MOSFET states with the established ON/OFF conditions during battery charging. The device also incorporates short-circuit control to manage the generator's output terminals when charging is paused, along with a FET OFF mechanism that generates fixed cycles of OFF states for the MOSFETs.

Another significant patent is a power source device designed for rectifying the output of an AC generator with magneto coils arranged in a star-shaped connection. This device features a control rectifier circuit that performs full-wave rectification on three-phase AC voltages. It includes a controller that manages the output based on the generator's rotational speed, ensuring efficient power delivery to the load.

Career Highlights

Hirofumi Yamaguchi has worked with prominent companies in the industry, including Kokusan Denki Co., Ltd. and Mahle Electric Drives Japan Corporation. His experience in these organizations has contributed to his expertise in developing innovative electrical solutions.

Collaborations

Yamaguchi has collaborated with talented individuals such as Shuichi Muramatsu and Masaki Asari. These partnerships have fostered a creative environment that has led to the development of groundbreaking technologies.

Conclusion

Hirofumi Yamaguchi is a distinguished inventor whose work in battery-charging technology and power source devices has made a significant impact in the field. His innovative spirit and dedication to engineering continue to inspire advancements in electrical technology.