Location History:
- Iwanuma, JP (1996 - 2015)
- Kanagawa, JP (2016 - 2018)
Company Filing History:
10 out of 28,605 
2 out of 234 
1 out of 833,002 Years Active: 1996-2018
Title: Hisahiro Kamata: Innovator in High-Voltage Inverter Technology
Introduction
Hisahiro Kamata is a prominent inventor based in Kanagawa, Japan. He has made significant contributions to the field of electrical engineering, particularly in the development of high-voltage inverter technology. With a total of 12 patents to his name, Kamata's work has had a substantial impact on the industry.
Latest Patents
Kamata's latest patents include innovative designs for high-voltage inverters. One notable invention is an inverter that features transformers with identical characteristics. The exciting windings of these transformers are connected in parallel, allowing them to be excited simultaneously. The output windings are connected in series, ensuring that the waveforms of the output voltages are time-synchronized. Each transformer is designed with a core that has an identical shape, including an inner leg with an independent closed magnetic circuit. This design allows for stepless adjustment of the gap size in the inner leg while the excitation current is applied, enabling regulation of the exciting inductances to a predetermined value.
Another significant invention is an inverter device that applies an excitation current to a step-up transformer through a switching element. This device outputs an alternating-current half-wave waveform from the output winding of the transformer. It includes an input-voltage detecting unit, a current detecting unit, and a comparing unit that detects high-current periods. The control circuit adjusts the switching element's on period based on the detected high-current information.
Career Highlights
Throughout his career, Kamata has worked with notable companies such as Ricoh Company, Ltd. and Tohoku Ricoh Co., Ltd. His experience in these organizations has contributed to his expertise in inverter technology and electrical engineering.
Collaborations
Kamata has collaborated with esteemed colleagues, including Tsuneo Ikenoue and Yoshiyuki Shishido. Their joint efforts have further advanced the field of high-voltage inverters and related technologies.
Conclusion
Hisahiro Kamata's innovative work in high-voltage inverter technology has established him as a key figure in the electrical engineering sector. His numerous patents and collaborations reflect his dedication to advancing technology and improving electrical systems.