Yasunobu Koshimura

Title: Yasunobu Koshimura: Innovator in Power Supply and Discharge Lamp Technology

Introduction

Yasunobu Koshimura is a notable inventor based in Tokyo, Japan. He has made significant contributions to the field of electrical engineering, particularly in power supply devices and discharge lamp technology. With a total of two patents to his name, Koshimura's work reflects a commitment to innovation and practical applications in the industry.

Latest Patents

Koshimura's latest patents include a power supply device and an apparatus for operating discharge lamps. The power supply device features an output transformer for an inverter driven by a pulsating voltage obtained through the full-wave rectification of low-frequency alternating current voltage. This device is equipped with an auxiliary winding, allowing for the rectification of high-frequency voltage to charge a capacitor. The voltage across the capacitor is utilized as an auxiliary voltage alongside the pulsating voltage to drive the inverter. Additionally, the circuit for charging the capacitor incorporates a current-limiting inductor with first and second coil sections, enabling the charging current to flow alternately in opposite directions based on the polarity of the high-frequency voltage.

The apparatus for operating discharge lamps involves rectifying a low-frequency AC voltage through a full-wave rectifier to create a pulsating voltage. This pulsating voltage is then superimposed with an auxiliary voltage from a separate power source. The resulting composite pulsating voltage is inverted at an inverter to produce a high-frequency voltage, which is used to operate a discharge lamp. The minimum value of the resultant voltage is strategically set to be between one-third and four-fifths of the maximum value.

Career Highlights

Koshimura is currently employed at Toshiba Electric Equipment Corporation, where he continues to develop innovative technologies. His work at Toshiba has allowed him to contribute to advancements in electrical engineering and power supply systems.

Collaborations

Throughout his career, Koshimura has collaborated with esteemed colleagues, including Nanjou Aoike and Hisao Kobayashi. These collaborations have fostered a creative environment that encourages the exchange of ideas and technological advancements.

Conclusion

Yasunobu Koshimura's contributions to the fields of power supply devices and discharge lamp technology highlight his innovative spirit and dedication to engineering excellence. His patents reflect a deep understanding of electrical systems and their applications in modern technology.