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Koizumi Lab
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The Koizumi Lab studies power supply circuits using power electronics, which converts electric power freely.
AboutAbout the lab
Power electronics for converting electric power freely.
The Koizumi Lab studies power electronics, which converts electric power freely.
Energy consumption is one of the main causes of global environmental problems, and power conversion is a key technology for energy saving and efficient use of energy.
Building on its research on compact, high-efficiency power supplies, the lab studies power converters for distributed power sources such as solar power generation, and power control equipment for distribution systems.
The lab's research starts from circuits that students conceive with free ideas, pursues the theory behind them, and verifies their operation with hand-built circuits.
Key terms
- Power electronics
- Technology that converts electric power freely. It is considered a key to energy saving and efficient use of energy
- Resonant power supply
- A power supply based on Class D and Class E amplifiers, which were conceived as high-frequency power amplifiers. Class D and Class E inverters are the central components
- Load-independent characteristics
- The property of an operating mode that does not depend on load variation. Such circuits were once regarded as sensitive to load variation and as having a narrow operating range
ResearchResearch themes
The lab proposes original circuit topologies and drive methods for resonant power supplies based on high-frequency power amplifiers. In recent years the technology has been applied to wireless power transfer, and the lab currently focuses on load-independent characteristics.
*Illustrative imageResonant inverters and load-independent characteristics
Centering on inverters for resonant power supplies based on Class D and Class E amplifiers, the lab proposes original circuit topologies and drive methods. These circuits have been regarded as sensitive to load variation, but the lab focuses on an operating mode independent of load variation that was reported about 30 years ago, and studies applying it to its own circuit configurations.
*Illustrative imageSwitched-capacitor inverters
This research began in 2009 from a student's idea and has continued, with improvements such as those to the modulation method carried over. It combines voltage step-up with multilevel waveform generation, and because it does not use the inductor-based step-up principle, it is expected to be lightweight.
*Illustrative imageApplication to battery voltage equalization
Research on applying the load-independent characteristics of resonant converters to voltage equalization circuits for storage batteries. A patent application for this application is pending.
MembersFaculty
- ProfessorHirotaka Koizumi
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “AC-to-DC 5 Volts 1A switching power supply circuit board (6)” Suyash Dwivedi / CC BY-SA 4.0 (cropped)
- Resonant inverters and load-independent characteristics: “Dornbirn-Inverter KACO Powador 25000xi-M-circuit board-09ASD” Asurnipal / CC BY-SA 4.0 (cropped)
- Switched-capacitor inverters: “Kramer Electronics SID-X1N - board-9976” Raimond Spekking / CC BY-SA 4.0 (cropped)
- Application to battery voltage equalization: “Turbo Akku Vac Easy Home VC 618WP - battery pack-1376” Raimond Spekking / CC BY-SA 4.0 (cropped)
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- Related lab (山口研究室): “Fukushima 1 Power Plant control room (crop)” kawamoto takuo / CC BY 2.0 (cropped)
- Related lab (和田研究室): “Omron LD Robot” Auledas / CC BY-SA 4.0 (cropped)
- Related lab (吉田研究室): “Triangular wave and square wave on oscilloscope screen” User:Xato / CC0 (cropped)
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