Introduction: Ryoji Maruyama is a distinguished inventor based in Kawasaki, Japan, known for his contributions to electrical engineering and power calculation systems. With a total of eight patents to his name, he has made significant strides in simplifying and enhancing the technology used in power measurement and analysis.

Latest Patents: Maruyama's latest innovations include an "Electric Power Calculation System" and a "Power Arithmetic Apparatus." The Electric Power Calculation System utilizes a novel approach where voltage and current inputs from terminals are A/D converted to 1-bit output data. This data is then delayed using a specially designed phase-shifting circuit, allowing for the calculation of reactive power while minimizing the complexity of analog circuitry. This compact design leads to low-cost implementations suitable for use in large-scale integrated circuits (LSIs). The Power Arithmetic Apparatus, on the other hand, detects variations in voltage and current to accurately calculate the power of a measuring object. This device showcases Maruyama's commitment to advancing measurement technologies.

Career Highlights: Ryoji Maruyama has spent a significant portion of his career at the esteemed company, Kabushiki Kaisha Toshiba. His work there has focused on innovative solutions for power measurement, making him a key player in the field. His eight patents reflect his dedication to developing new methodologies and technologies that address critical issues in electrical engineering.

Collaborations: Throughout his career, Maruyama has collaborated with several talented individuals, including Hideyuki Funaki and Hiroshi Mochizuki. These partnerships have enabled him to pool expertise and creativity, leading to the successful development of his patented technologies and furthering his impact in the industry.

Conclusion: Ryoji Maruyama stands out as a leading inventor in the realm of power calculation systems. His innovations not only enhance the accuracy and efficiency of power measurement but also contribute to the ongoing evolution of electrical engineering technologies. With each patent, Maruyama continues to push the boundaries of innovation, solidifying his legacy as a prominent figure in the field.

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