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For the Inventor, By the Inventor

Hitachi, Japan

Yasuo Kaminaga

This inventor holds 12 USPTO granted patents. Top assignees: Hitachi, Ltd., Hitachi Appliances, Inc. Active years: 1997-2012.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Yasuo Kaminaga. Retrieved from https://idiyas.com/inventor/yasuo-kaminaga

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 12

% Patents Active = 66.7

Average Co-Inventor Count = 4.3

ph-index = 7

Forward Citations = 133(Granted Patents)


Company Filing History:

goldMedal12 out of 42,731 
 
Hitachi, Ltd.
 patents
silverMedal1 out of 48 
 
Hitachi Appliances, Inc
 patents
where one patent can have more than one assignee

Years Active: 1997-2012

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12 patents (USPTO):Explore Patents
1. 8207717 - Buck-boost DC-DC converter with auxiliary inductors for zero current switching (2012-06-26),
2. 7557546 - Unidirectional DC-DC converter (2009-07-07),
3. 7551462 - Soft switching DC-DC converter including a buck converter and a boost converter sharing a common transformer (2009-06-23),
4. 6728811 - Input/output device for connection and disconnection of active lines (2004-04-27),
5. 6393509 - Input/output device for connection and disconnection of active lines (2002-05-21),
6. 6289407 - Input/output device for connection and disconnection of active lines (2001-09-11),
7. 6160275 - Semiconductor gate array device (2000-12-12),
8. 6038615 - Input/output device for connection and disconnection of active lines (2000-03-14),
9. 5880602 - Input and output buffer circuit (1999-03-09),
10. 5663659 - Semiconductor integrated circuit device comprising CMOS transistors and (1997-09-02),
11. 5614848 - High-speed semiconductor integrated circuit device composed of CMOS and (1997-03-25),
12. 5604417 - Semiconductor integrated circuit device (1997-02-18),

Title: Innovations by Yasuo Kaminaga: The Pioneer of DC-DC Converters

Introduction

Yasuo Kaminaga, an accomplished inventor based in Hitachi, Japan, has made significant contributions to the field of electrical engineering, particularly in the realm of DC-DC converters. With a total of 12 patents to his name, Kaminaga's innovations have paved the way for advancements in power supply technology, emphasizing efficiency and simplicity.

Latest Patents

Kaminaga's recent inventions include cutting-edge designs such as the "Buck-Boost DC-DC Converter with Auxiliary Inductors for Zero Current Switching." This unidirectional converter features a DC power supply and integrates both buck and boost converter circuits, comprising essential components like main switching elements, snubber capacitors, and control devices. The design focuses on minimizing current switching losses, enhancing overall efficiency.

Another significant patent is his "Unidirectional DC-DC Converter," which boasts a streamlined control circuit that operates without multiple insulated power supplies or transformers. This innovation employs an auxiliary inductor of smaller capacitance, resulting in a compact and lightweight converter that retains high capacitance without the necessity of supply current switching. The converter effectively utilizes a main Insulated Gate Bipolar Transistor (IGBT) and includes an auxiliary IGBT to optimize energy discharge through a back-to-back connected diode, all while achieving Zero Voltage and Zero Current Switching (ZVZCS).

Career Highlights

Throughout his career, Yasuo Kaminaga has been associated with notable companies like Hitachi, Ltd. and Hitachi Appliances, Inc. His work has been instrumental in advancing the technological landscape of power conversion, showcasing his expertise and innovative mindset.

Collaborations

Kaminaga has collaborated with talented individuals such as Yoji Nishio and Tsutomu Yamada. These professional partnerships have contributed to the refinement of his inventions and the successful realization of groundbreaking projects in the field of electrical engineering.

Conclusion

Yasuo Kaminaga stands out as a visionary inventor whose work in DC-DC converters has significantly influenced modern electrical engineering practices. His portfolio of 12 patents demonstrates his dedication to innovation and efficiency, marking him as a key figure in the advancement of power supply technology. As industries continue to evolve and demand smarter solutions, Kaminaga's contributions will undoubtedly remain relevant and impactful.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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