Yoshihisa Ishigami

Title: **Yoshihisa Ishigami: Innovative Mind Behind Ground Fault Interrupters and Illumination Sensors**

Introduction

Yoshihisa Ishigami, a notable inventor based in Tsu, Japan, has made significant contributions to the field of electrical safety and automation. With a portfolio that includes three patents, Ishigami has been instrumental in developing technologies that enhance the functionality and safety of electrical systems.

Latest Patents

Ishigami's most recent innovations include a ground fault interrupter and an illumination sensor, both of which showcase his inventive prowess.

The **ground fault interrupter** incorporates a zero-phase current transformer designed to detect unbalanced current flowing in electric lines. This device includes a switch in the electric lines and a detection resistor connected in parallel to the transformer, which converts the current output to voltage. The controller within this system determines whether an electric leak occurs based on the voltage from the detection resistor and opens the switch when necessary. Additionally, the design features filters to remove high-frequency elements from the voltage signal, ensuring accurate detection and response.

The **illumination sensor with spectral sensitivity** corresponds to human luminosity characteristics. It comprises a solar battery that detects surrounding brightness, controlling a switching element based on its output voltage. This innovative system employs MOSFETs to create an electronic automatic on/off switch, managed through a triac that is activated by the switching element.

Career Highlights

Yoshihisa Ishigami has been associated with Matsushita Electric Works, Ltd., where he has developed these state-of-the-art innovations. His work not only reflects his commitment to enhancing electrical safety but also highlights his role in advancing automation technologies.

Collaborations

Throughout his career, Ishigami has collaborated with esteemed colleagues such as Nobuhiro Kitamura and Yukihiro Murata. Their joint efforts have further propelled innovation within the company, leading to substantial technological advancements.

Conclusion

In conclusion, Yoshihisa Ishigami stands out as a brilliant inventor whose work has made a lasting impact on electrical safety and automation. His patents, particularly in ground fault interrupters and illumination sensors, exemplify the importance of innovation in addressing modern-day challenges. Through his career at Matsushita Electric Works, he continues to inspire advancements in technology that enhance safety and efficiency.