Seiji Ishda

Title: Seiji Ishda and His Patent for DC Apparatus and Vehicle Applications.

Introduction

Seiji Ishda is an inventor associated with Tokyo, Japan, and Hitachi, Ltd. His listed patent concerns power-conversion control for a DC apparatus and a vehicle using that apparatus.

Latest Patents

Ishda’s listed patent is “DC Apparatus and Vehicle Using the Same.” The invention detects the voltage applied to a power converter and generates a proportional voltage signal. A high-pass filter identifies an AC component superimposed on the detected voltage, and a bias voltage is added to that component. The resulting signal is combined with the proportional voltage and compared with a triangular wave to control a switching element. The described approach increases a resistance current when the DC current decreases because of the AC component, helping cancel AC components in the current and resistance current. The supplied information lists 1 patent for Ishda.

Career Highlights

The available information associates Ishda with Hitachi, Ltd., a company involved in developing and applying technologies across multiple fields. His listed patent addresses the control of power-conversion switching in DC equipment and vehicle applications.

Collaborations

Kiyoshi Nakata and Tetsuo Kojima are identified as Ishda’s coworkers. The supplied information does not specify their roles in the patent.

Conclusion

Seiji Ishda’s listed invention focuses on managing AC components in a DC power-conversion system through signal processing and switching control, with potential application in vehicles.