Company Filing History:
2 out of 42,508 
1 out of 2,333 
Years Active: 1986-1994
Title: Noboru Ogawa: Innovator in Power Electronics
Introduction
Noboru Ogawa is a distinguished inventor based in Hitachi, Japan. He has made significant contributions to the field of power electronics, particularly in the development of advanced motor driving systems and switching regulators. With a total of 2 patents, Ogawa's work has had a profound impact on the efficiency and performance of electrical systems.
Latest Patents
Ogawa's latest patents include a large capacity variable speed PWM spatial vector type sub-harmonic driving system. This innovative system is designed for variable-speed driving of AC motors using power converters, specifically employing GTO (gate turn-off) thyristors as switching devices. The system boasts impressive specifications, including a torque ripple of 1% or less, a speed response of 60 rad/sec or more, an efficiency of 95% or more, and a power factor of 98% or more.
Another notable patent is a switch mode power supply featuring a magnetically controlled output. This regulator utilizes a saturable reactor to control the output voltage, allowing for miniaturization of the transformer core and improved voltage control circuit gain. The design ensures that the reset current does not flow through the transformer, preventing saturation and excessive temperature increases.
Career Highlights
Throughout his career, Noboru Ogawa has worked with prominent companies such as Hitachi, Ltd. and Hitachi Metals, Ltd. His experience in these organizations has allowed him to refine his expertise in power electronics and contribute to groundbreaking innovations in the industry.
Collaborations
Ogawa has collaborated with notable colleagues, including Shigeta Ueda and Takashi Ikimi. These partnerships have fostered a collaborative environment that has led to the advancement of technology in their respective fields.
Conclusion
Noboru Ogawa's contributions to power electronics through his innovative patents and collaborations highlight his role as a key figure in the industry. His work continues to influence the development of efficient and effective electrical systems.