JOURNAL

  1. M. Noah, K. Umetani, J. Imaoka, and M. Yamamoto, “Lagrangian dynamics model and practical implementation of an integrated transformer in multi-phase LLC resonant converter,” IET Power Electron., vol. 11, no. 2, pp. 339–347, Feb. 2018

    IEEE Xplore

  2. M. Noah, K. Umetani, M. Yamamoto, and J. Imaoka, “A winding orientation method to minimize the secondary leakage of a gapped transformer utilized in LLC resonant converter,” IET Electronics Letters, vol. 54, no. 3, pp. 157–159, Feb. 2018.

    IEEE Xplore

  3. M. Noah, S. Endo, H. Ishibashi, M. Yamamoto, K. Umetani, J. Imaoka, “A current sharing method utilizing single balancing transformer for a multiphase LLC resonant converter with integrated magnetics,” IEEE J. Emerg. Sel. Topics Power Electron., vol. 6, no. 2, pp. 977–992, Jun. 2018.

    IEEE Xplore

  4. T. Koyama, K. Umetani, and E. Hiraki, “Design optimization method for the load impedance to maximize the output power in dual transmitting resonator wireless power transfer system,” IEEJ J. Ind. Appl., pp. 49–55, Jan. 2018.

    JSTAGE

  5. T. Shirakawa, K. Umetani, and E. Hiraki, “Extremum co-energy principle for analyzing ac current distribution in parallel-connected wires of high frequency power inductors,” IEEJ J. Ind. Appl., vol. 7, no. 1, pp. 35–42, Jan. 2018.

    IEEE Xplore

  6. M. Noah, S. Kimura, J. Imaoka, W. Martinez, S. Endo, M. Yamamoto, and K. Umetani, “Magnetic design and experimental evaluation of a commercially available single integrated transformer in three-phase LLC converter,” IEEE Trans. Ind. Appl. (in press)

    IEEE Xplore

  7. W. Martinez, C. Cortes, M. Yamamoto, J. Imaoka, and K. Umetani, “Total volume evaluation of high power density non-isolated DC-DC converters with integrated magnetics for electric vehicles,” IET Power Electronics, vol. 10, no. 14, pp. 2010–2014, Nov. 2017.

    IEEE Xplore

  8. K. Umetani, K. Aikawa, and E. Hiraki, “Straightforward measurement method of common source inductance for fast switching semiconductor devices mounted on-board,” IEEE Trans. Ind. Electron., vol. 64, no. 10, pp. 8258–8267, Oct. 2017.

    IEEE Xplore

  9. M. Onishi, I. Iizawa, K. Umetani, A. Ito, A. Yajima, K. Ono, N. Amemura, and S. Sakai, “Local effective thermal inertia estimated by cloud appearance,” Scientific Online Letters on the Atmosphere, vol. 13, pp. 59–62, Apr. 2017.

    IEEE Xplore

  10. K. Umetani, K. Aikawa, E. Hiraki : "Straightforward Measurement Method of Common Source Inductance for Fast Switching Semiconductor Devices Mounted on Board", IEEE Transactions on Industrial Electronics, Year: 2017, Vol. 64, No. 10, pp. 8258 - 8267 (2017)

    IEEE Xplore 論文PDF

  11. N Nanato, N Kishi, Y Tanaka and M Kondo: Basic study for a large AC current supply with a single phase air-core Bi2223 high temperature superconducting transformer, Journal of Physics: Conference Series, Vol. 871, 012101 (2017)

    IOP 論文PDF

  12. N Nanato, S Nakamura and S Tanaka: Detection of normal transitions in a hybrid single-phase Bi2223 high temperature superconducting transformer by using the active power method and a magnetic flux detection coil, Journal of Physics: Conference Series, Vol. 871, 012085 (2017)

    IOP 論文PDF

  13. N Nanato, K Okura, H Kumagai and H Aoyama: Locating of normal transitions in a Bi2223 high temperature superconducting coil by using capacitor type voltage terminals and the active power method, Journal of Physics: Conference Series, Vol. 871, 012084 (2017)

    IOP 論文PDF

  14. M. Ishihara, K. Umetani, H. Umegami, E. Hiraki, and M. Yamamoto, “Quasi-duality between SS and SP topologies of basic electric-field coupling wireless power transfer system,” IET Electronics Letters, vol. 52, no. 25, pp. 2057–2059, Dec. 2016.

    IEEE Xplore

  15. K. Umetani, K. Yagyu, and E. Hiraki, “A design guideline of parasitic inductance for preventing oscillatory false triggering of fast switching GaN-FET,” IEEJ Trans. Elect. Electron. Eng., vol. 11, no. S2, pp. S84–S90, Dec. 2016.

    Wiley

  16. K. Umetani, “Lagrangian method for deriving electrically dual power converters applicable to non-planar circuit topologies,” IEEJ Trans. Elect. Electron. Eng., vol. 11, no. 4, pp. 521–530, Jul. 2016.

    Wiley

  17. J. Imaoka, K. Umetani, S. Kimura, W. Martinez, M. Yamamoto, S. Arimura, and T. Hirano, “Magnetic analysis, design and experimental evaluations of integrated winding coupled inductors in interleaved converters,” IEEJ J. Ind. Appl., vol. 5, no. 3, pp. 276–288, May 2016.

    JSTAGE 論文PDF

  18. I. Iizawa, K. Umetani, A. Ito, A. Yajima, K. Ono, N. Amemura, M. Onishi, and S. Sakai, “Time evolution of an urban heat island from high-density observations in Kyoto city,” Scientific Online Letters on the Atmosphere, vol. 12, pp. 51–54, Feb. 2016.

    JSTAGE 論文PDF

  19. J. Imaoka,K. Umetani,S. Kimura,W. Martinez,M. Yamamoto,S. Arimura,T. Hirano: Magnetic Analysis, Design, and Experimental Evaluations of Integrated Winding Coupled Inductors in Interleaved Converters, IEEJ Journal of Industry Applications, Vol. 5 (2016) No. 3 p. 276-288

    JSTAGE 論文PDF

  20. K. Umetani, E. Hiraki, and M. Yamamoto, “Lagrangian-based derivation of a novel sliding mode control for synchronous buck converters,” IEEJ J. Ind. Appl., vol. 4, no. 6, pp. 728–729, Nov. 2015.

    JSTAGE 論文PDF

  21. K. Umetani, M. Yamamoto and E. Hiraki, “Simple Flux-based Lagrangian Formulation to Model the Non-linearity of Concentrated-winding Switched Reluctance Motors,” IET Electronics Letters, vol. 51, no. 24, pp.1984–1986, Nov. 2015.

    IEEE Xplore

  22. H. Umegami, K. Umetani, M. Yamamoto, and E. Hiraki, “Lagrangian-based equivalent circuit of basic electric-field coupling wireless power transfer system,” IEEJ Trans. Elect. Electron. Eng., vol. 10, no. S1, pp. S168–S170, Oct. 2015.

    Wiley

  23. K. Umetani, T. Tera, and K. Shirakawa, “A magnetic structure integrating differential-mode and common-mode inductors with improved tolerance to DC saturation,” IEEJ J. Ind. Appl., vol. 4, no. 3, pp. 166–173, May 2015.

    JSTAGE 論文PDF

  24. W. Martinez, J. Imaoka, M. Yamamoto and K. Umetani, “Parasitic resistance analysis in a novel high step-up interleaved converter for hybrid electric vehicles”, J. Japan Inst. Power Electron., JIPE-40-08, vol. 40, pp. 93–104, Mar. 2015.

    JSTAGE 論文PDF

  25. K. Umetani, J. Imaoka, M. Yamamoto, S. Arimura, and T. Hirano, “Evaluation of the Lagrangian method for deriving equivalent circuits of integrated magnetic components: a case study using the integrated winding coupled inductor,” IEEE Trans. Ind. Appl., vol. 51, no. 1, pp. 547–555, Jan. 2015.

    IEEE Xplore 論文PDF

  26. H. Tanaka, T. Tanaka, T. Wakimoto, E. Hiraki, M. Okamoto : "Reduced-Capacity Smart Charger for Electric Vehicles on Single-Phase Three-Wire Distribution Feeders With Reactive Power Control", IEEE Transactions on Industry Applications, Vol. 51, No. 1, pp. 315-324 (2015)

    IEEE Xplore

  27. T. Soe Win, Y. Hisada, T. Tanaka, E. Hiraki, M. Okamoto, S. Ryong Lee, "Novel Simple Reactive Power Control Strategy With DC Capacitor Voltage Control for Active Load Balancer in Three-Phase Four-Wire Distribution Systems", IEEE Transactions on Industry Applications, Vol. 51, No. 5, pp. 4091 - 4099 (2015)

    IEEE Xplore

  28. N. Nanato, K. Nishiyama: Locating of normal transitions in a Bi2223 high temperature superconducting coil by non-contact voltage measurement method, Cryogenics, Vol. 72, pp. 53-56 (2015)

    ScienceDirect

  29. N. Nanato, Y. Kobayashi: Quench Detection and Protection for High Temperature Superconducting Transformers by Using the Active Power Method, Physics Procedia, Vol. 58, pp. 264-267 (2014) (Proceedings of the 26th International symposium on superconductivity)

    ScienceDirect

  30. K. Umetani,M. Yamamoto,E. Hiraki: Lagrangian-Based Derivation of a Novel Sliding-Mode Control for Synchronous Buck Converters, IEEJ Journal of Industry Applications,Vol. 4 (2015) No. 6 p. 728-729

    JSTAGE 論文PDF

  31. T. Soe Win,Y. Hisada,T. Tanaka,E. Hiraki,M. Okamoto,S. Ryong Lee: Reactive Power Control Strategy Based on DC Capacitor Voltage Control for Active Load Balancer in Three-Phase Four-Wire Distribution Systems, IEEJ Journal of Industry Applications, Vol. 4 (2015) No. 3 p. 158-165

    JSTAGE 論文PDF

  32. K. Umetani,M. Yamamoto,E. Hiraki: Lagrangian-Based Derivation of a Novel Sliding-Mode Control for Synchronous Buck Converters, IEEJ Journal of Industry Applications, Vol. 4 (2015) No. 6 p. 728-729

    JSTAGE 論文PDF

  33. N. Nanato, K. Nishiyama: Non-destructive Detection of Normal Transitions in High Temperature Superconducting Coil, Physics Procedia, Vol. 58, pp. 260-263 (2014) (Proceedings of the 26th International symposium on superconductivity)

    ScienceDirect

  34. N. Nanato, N. Takemoto: Time-frequency Analyses of AE Signals in YBCO Superconductors, Physics Procedia, Vol. 58, pp. 256-259 (2014) (Proceedings of the 26th International symposium on superconductivity)

    ScienceDirect

  35. H. Tanaka,T. Wakimoto,T. Tanaka,M. Okamoto,E. Hiraki: Reducing Capacity of Smart Charger for Electric Vehicles on Single-Phase Three-Wire Distribution Feeders with Reactive Power Control, IEEJ Journal of Industry Applications, Vol. 3 (2014) No. 6 p. 437-445

    JSTAGE 論文PDF

  36. T. Soe Win,E. Hiraki,M. Okamoto,S. Ryong Lee,T. Tanaka: Novel Control Algorithm for Active Load Balancer in Three-Phase Four-Wire Distribution Systems, IEEJ Journal of Industry Applications, Vol. 3 (2014) No. 3 p. 286-287

    JSTAGE 論文PDF