Makoto Hagiwara

Title: Makoto Hagiwara: Innovator in Chopper Circuit Technology

Introduction

Makoto Hagiwara is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of electrical engineering, particularly in the development of chopper circuits. With a total of 8 patents to his name, Hagiwara's work has advanced the technology used in voltage conversion and power management.

Latest Patents

Hagiwara's latest patents include innovative designs for chopper circuits. One of his notable inventions is a chopper circuit that performs voltage conversion between two DC voltages at external connection terminals. This circuit features a first switch portion and a second switch portion connected in series, ensuring that the conducting direction during ON-time matches that of the first switch portion. Additionally, it incorporates one or more semiconductor power converters that are cascade-connected, along with an inductor connected in series with these converters.

Another significant patent is the bidirectional chopper circuit. This design includes a main power converter with a first and a second switch arranged so that one switch turns off when the other is on. The circuit is designed to connect in series, allowing for efficient power conversion. It also features a plurality of single-phase full-bridge power converters and an inductor connected in series, enhancing its functionality.

Career Highlights

Throughout his career, Hagiwara has worked with esteemed institutions such as the Tokyo Institute of Technology and Viscodrive Japan. His experience in these organizations has allowed him to refine his skills and contribute to groundbreaking innovations in electrical engineering.

Collaborations

Hagiwara has collaborated with notable professionals in his field, including Hirofumi Akagi. Their joint efforts have led to advancements in chopper circuit technology and have furthered the understanding of power conversion systems.

Conclusion

Makoto Hagiwara is a distinguished inventor whose work in chopper circuits has made a lasting impact on electrical engineering. His innovative patents and collaborations highlight his commitment to advancing technology in this field.