Company Filing History:
2 out of 116 
1 out of 85 
Years Active: 2006-2007
Title: Hirokazu Tokuda: Innovator in Power Conversion Technologies
Introduction
Hirokazu Tokuda is a notable inventor based in Tokyo, Japan. He has made significant contributions to the field of power conversion, holding a total of 3 patents. His work focuses on improving the efficiency and functionality of power supply devices.
Latest Patents
One of Tokuda's latest patents is a power conversion apparatus. This apparatus includes serially connected arms U and X, arms V and Y, and arms W and Z, along with a capacitor, all connected in parallel. The input-side arms U and X and the output-side arms W and Z are subjected to PWM control. This design allows for a step-down operation, where the output voltage is lower than the input voltage. Conversely, a step-up operation can also be achieved by controlling the output-side arms to have a higher voltage than the input-side arms, thus expanding the output voltage control range while reducing distortion.
Another significant patent is a power-supply device that suppresses high harmonic waves and controls the flow of AC power. This device minimizes adverse effects on a load during startup or stopping. It includes a voltage supply unit that gradually lowers the output voltage when starting up and gradually increases it when stopping, ensuring a smooth transition in voltage levels.
Career Highlights
Hirokazu Tokuda has worked with prominent companies such as Fuji Electric Systems Co., Ltd. and Fuji Electric Holdings Co., Ltd. His experience in these organizations has contributed to his expertise in power conversion technologies.
Collaborations
Throughout his career, Tokuda has collaborated with notable colleagues, including Nobuyuki Kobayashi and Yasuhiro Okuma. These collaborations have likely enriched his work and led to innovative advancements in his field.
Conclusion
Hirokazu Tokuda is a distinguished inventor whose work in power conversion technologies has led to several important patents. His contributions continue to influence the efficiency and effectiveness of power supply devices in various applications.