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Author

  • Eiji Hiraki
2020

Effects of secondary leakage inductance on the LLC resonant converter

Noah, M., Shirakawa, T., Umetani, K., Imaoka, J., Yamamoto, M. & Hiraki, E., Jan 2020, In : IEEE Transactions on Power Electronics. 35, 1, p. 835-852 18 p., 8691610.

Research output: Contribution to journalArticle

2019

Analytical Derivation of Phase Current Waveform Eliminating Torque Ripple and Input Current Ripple of Switched Reluctance Motors under Magnetically Saturated Operation

Kusumi, T., Kobayashi, K., Umetani, K. & Hiraki, E., Sep 2019, 2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019. Institute of Electrical and Electronics Engineers Inc., p. 6540-6547 8 p. 8912726. (2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Automatic active compensation method of cross-coupling in multiple-receiver resonant inductive coupling wireless power transfer systems

Ishihara, M., Fujiki, K., Umetani, K. & Hiraki, E., Sep 2019, 2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019. Institute of Electrical and Electronics Engineers Inc., p. 4584-4591 8 p. 8913279. (2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Axial heating coil structure for reducing magnetic levitation force of all-metal type induction cookers

Kamaeguchi, K., Umetani, K. & Hiraki, E., Nov 2019, 8th International Conference on Renewable Energy Research and Applications, ICRERA 2019. Institute of Electrical and Electronics Engineers Inc., p. 793-798 6 p. 8997068. (8th International Conference on Renewable Energy Research and Applications, ICRERA 2019).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Characteristic Analysis of Integrated Magnetic Component for Forward Converter

Shiraishi, T., Hattori, F., Ishitobi, M. & Hiraki, E., May 1 2019, ICPE 2019 - ECCE Asia - 10th International Conference on Power Electronics - ECCE Asia. Institute of Electrical and Electronics Engineers Inc., 8797221. (ICPE 2019 - ECCE Asia - 10th International Conference on Power Electronics - ECCE Asia).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Core loss modeling based on equivalent circuit for switched reluctance motors

Kusumi, T., Kobayashi, K., Hara, T., Umetani, K. & Hiraki, E., Feb 1 2019, Proceedings - 2019 IEEE International Conference on Industrial Technology, ICIT 2019. Institute of Electrical and Electronics Engineers Inc., p. 1743-1748 6 p. 8754931. (Proceedings of the IEEE International Conference on Industrial Technology; vol. 2019-February).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Effects of secondary leakage inductance on the LLC resonant converter - Part i: Transformer voltage gain and efficiency

Noah, M., Shirakawa, T., Umetani, K., Imaoka, J., Yamamoto, M. & Hiraki, E., May 24 2019, 34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019. Institute of Electrical and Electronics Engineers Inc., p. 780-786 7 p. 8721980. (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC; vol. 2019-March).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Effects of secondary leakage inductance on the LLC resonant converter - Part II: Frequency control bandwidth with respect to load variation

Noah, M., Shirakawa, T., Umetani, K., Imaoka, J., Yamamoto, M. & Hiraki, E., May 24 2019, 34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019. Institute of Electrical and Electronics Engineers Inc., p. 1408-1414 7 p. 8722190. (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC; vol. 2019-March).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Experimental verification of impedance matching method for repeater to improve spatial freedom of 6.78 MHz resonant inductive coupling wireless power transfer systems

Fujiki, K., Ishihara, M., Umetani, K. & Hiraki, E., Sep 2019, 2019 21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe. Institute of Electrical and Electronics Engineers Inc., 8915171. (2019 21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Feasibility study of fractal-fin heat sink for improving cooling performance of switching power converters

Ikegami, S., Umetani, K., Hiraki, E., Sakai, S. & Higashino, S., Jan 14 2019, 2018 IEEE International Telecommunications Energy Conference, INTELEC 2018 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 8612377. (INTELEC, International Telecommunications Energy Conference (Proceedings); vol. 2018-October).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Optimal Winding Layer Allocation for Minimizing Copper Loss of Secondary-Side Center-Tapped Forward Transformer with Parallel-Connected Secondary Windings

Shirakawa, T., Umetani, K., Hiraki, E., Itoh, Y. & Hyodo, T., Sep 2019, 2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019. Institute of Electrical and Electronics Engineers Inc., p. 6206-6213 8 p. 8912519. (2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Receiving-coil structure reducing stray AC resistance for resonant coupling wireless power transfer

Umetani, K., Honjo, T., Koyama, T., Ishihara, M. & Hiraki, E., Aug 7 2019, In : IET Power Electronics. 12, 9, p. 2338-2344 7 p.

Research output: Contribution to journalArticle

Resonant frequency tuning system for repeater resonator of resonant inductive coupling wireless power transfer

Konishi, A., Fujiki, K., Umetani, K. & Hiraki, E., Sep 2019, 2019 21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe. Institute of Electrical and Electronics Engineers Inc., 8914736. (2019 21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Simple fully analytical copper loss model of litz wire made of strands twisted in multiple levels

Umetani, K., Acero, J., Sarnago, H., Lucia, O. & Hiraki, E., May 24 2019, 34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019. Institute of Electrical and Electronics Engineers Inc., p. 1257-1264 8 p. 8721827. (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC; vol. 2019-March).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Verification of device model by measuring capacitance and static characteristics for predicting switching waveform

Koki, K., Yoshioka, M., Umetani, K. & Hiraki, E., Nov 2019, 8th International Conference on Renewable Energy Research and Applications, ICRERA 2019. Institute of Electrical and Electronics Engineers Inc., p. 786-792 7 p. 8996508. (8th International Conference on Renewable Energy Research and Applications, ICRERA 2019).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Volume Reduction Effect of Thinly Extended Core Structure for Transformer in Isolated DC-DC Converter

Murata, R., Shirakawa, T., Umetani, K. & Hiraki, E., May 1 2019, ICPE 2019 - ECCE Asia - 10th International Conference on Power Electronics - ECCE Asia. Institute of Electrical and Electronics Engineers Inc., p. 2132-2138 7 p. 8796964. (ICPE 2019 - ECCE Asia - 10th International Conference on Power Electronics - ECCE Asia).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2018

Application of Automatic Resonant Frequency Tuning Circuit to Induction Heating System

Kamaeguchi, K., Umetani, K. & Hiraki, E., Oct 30 2018, 2018 20th European Conference on Power Electronics and Applications, EPE 2018 ECCE Europe. Institute of Electrical and Electronics Engineers Inc., 8515340

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Automatic Resonance Frequency Tuning Method for Repeater in Resonant Inductive Coupling Wireless Power Transfer Systems

Ishihara, M., Umetani, K. & Hiraki, E., Oct 22 2018, 2018 International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018. Institute of Electrical and Electronics Engineers Inc., p. 1610-1616 7 p. 8507768

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)
9 Citations (Scopus)

Elucidation of quasi-duality between series-series and series-parallel topologies of resonant inductive coupling wireless power transfer systems

Ishihara, M., Umetani, K. & Hiraki, E., Feb 9 2018, 2017 IEEE 12th International Conference on Power Electronics and Drive Systems, PEDS 2017. Institute of Electrical and Electronics Engineers Inc., Vol. 2017-December. p. 674-679 6 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Evaluation of impact of parasitic magnetic coupling in PCB layout on common source inductance of surface mounted package

Matsumoto, R., Aikawa, K., Konishi, A., Umetami, K. & Hiraki, E., Feb 9 2018, 2017 IEEE 12th International Conference on Power Electronics and Drive Systems, PEDS 2017. Institute of Electrical and Electronics Engineers Inc., Vol. 2017-December. p. 559-566 8 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)
2 Citations (Scopus)

High-frequency Self-Driven Synchronous Rectifier Controller for WPT Systems

Konishi, A., Umetani, K. & Hiraki, E., Oct 22 2018, 2018 International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018. Institute of Electrical and Electronics Engineers Inc., p. 1602-1609 8 p. 8507636

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Impedance Matching to Maximize Induced Current in Repeater of Resonant Inductive Coupling Wireless Power Transfer Systems

Ishihara, M., Umetani, K. & Hiraki, E., Dec 3 2018, 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018. Institute of Electrical and Electronics Engineers Inc., p. 6194-6201 8 p. 8557827

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Improved thin heating coil structure of copper foil feasible for induction cookers

Umetani, K., Mishima, T., Hiraki, E., Hirokawa, T., Imai, M. & Sadakata, H., Dec 26 2018, Proceedings: IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society. Institute of Electrical and Electronics Engineers Inc., p. 3503-3508 6 p. 8591462. (Proceedings: IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Improving Robustness Against Variation in Resonance Frequency for Repeater of Resonant Inductive Coupling Wireless Power Transfer Systems

Ishihara, M., Ohata, S., Fujiki, K., Umetani, K. & Hiraki, E., Oct 30 2018, 2018 20th European Conference on Power Electronics and Applications, EPE 2018 ECCE Europe. Institute of Electrical and Electronics Engineers Inc., 8515386

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)
5 Citations (Scopus)

Rotor Configuration Which Reduces Copper Loss of Switched Reluctance Motors with Suppression of Torque Ripple and Input Current Ripple

Kusumi, T., Hara, T., Umetani, K. & Hiraki, E., Dec 3 2018, 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018. Institute of Electrical and Electronics Engineers Inc., p. 6097-6103 7 p. 8558173

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Soft-switching control circuit based on traveling and reflected waves for high-frequency resonant inverter applicable to capacitive load impedance

Oyane, A., Itakura, K., Umetani, K., Hiraki, E., Ikenari, T. & Kawano, S., Dec 26 2018, Proceedings: IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society. Institute of Electrical and Electronics Engineers Inc., p. 3051-3056 6 p. 8592832. (Proceedings: IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Theoretical Derivation of Phase Current Profile for Switched Reluctance Motors to Suppress Radial Force Ripple and Torque Ripple

Kusumi, T., Hara, T., Umetani, K. & Hiraki, E., Aug 10 2018, Proceedings - 2018 IEEE 27th International Symposium on Industrial Electronics, ISIE 2018. Institute of Electrical and Electronics Engineers Inc., Vol. 2018-June. p. 1037-1042 6 p. 8433685

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Verification of the Reduction of the Copper Loss by the Thin Coil Structure for Induction Cookers

Hataya, M., Kamaeguchi, K., Hiraki, E., Umetani, K., Hirokawa, T., Imai, M. & Sadakata, H., Oct 22 2018, 2018 International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018. Institute of Electrical and Electronics Engineers Inc., p. 410-415 6 p. 8507826

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)
2017

Analytical investigation on design instruction to avoid oscillatory false triggering of fast switching SiC-MOSFETs

Sugihara, Y., Nanamori, K., Ishiwaki, S., Hayashi, Y., Aikawa, K., Umetani, K., Hiraki, E. & Yamamoto, M., Nov 3 2017, 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017. Institute of Electrical and Electronics Engineers Inc., Vol. 2017-January. p. 5113-5118 6 p. 8096861

Research output: Chapter in Book/Report/Conference proceedingConference contribution

13 Citations (Scopus)

An investigation into a slight-variation of the transformer effective permeability in LLC resonant converter

Noah, M., Endo, S., Kimura, S., Yamamoto, M., Imaoka, J., Umetani, K. & Hiraki, E., Nov 6 2017, 2017 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe. Institute of Electrical and Electronics Engineers Inc., Vol. 2017-January. 8099301

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Application of extremum co-energy principle for homogenizing current distribution in parallel-connected windings in transformers: Design optimization of winding turn allocation among winding layers

Shirakawa, T., Umetani, K. & Hiraki, E., Nov 6 2017, 2017 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe. Institute of Electrical and Electronics Engineers Inc., Vol. 2017-January. p. P1-P10 8099115

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Compact three-phase AC inductor network for PFC converter using magnetic coupled technique

Ozaki, T., Nakaido, H., Umetani, K., Hiraki, E., Ikenari, T. & Kawano, S., Dec 15 2017, Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society. Institute of Electrical and Electronics Engineers Inc., Vol. 2017-January. p. 958-963 6 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Extremum co-energy principle for analyzing AC current distribution in parallel-connected wires of high frequency power inductors

Shirakawa, T., Yamasaki, G., Umetani, K. & Hiraki, E., Jan 30 2017, 19th International Conference on Electrical Machines and Systems, ICEMS 2016. Institute of Electrical and Electronics Engineers Inc., 7837236

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Measurement of the common source inductance of typical switching device packages

Aikawa, K., Shiida, T., Matsumoto, R., Umetani, K. & Hiraki, E., Jul 25 2017, 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia, IFEEC - ECCE Asia 2017. Institute of Electrical and Electronics Engineers Inc., p. 1172-1177 6 p. 7992207

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Citations (Scopus)

Novel receiving coil structure for improving efficiency and power transfer capability of resonant inductive coupling wireless power transfer

Honjo, T., Koyama, T., Umetani, K. & Hiraki, E., Jan 30 2017, 19th International Conference on Electrical Machines and Systems, ICEMS 2016. Institute of Electrical and Electronics Engineers Inc., 7837238

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Novel thin heating coil structure with reduced copper loss for high frequency induction cookers

Hataya, M., Oka, Y., Umetani, K., Hiraki, E., Hirokawa, T. & Imai, M., Jan 30 2017, 19th International Conference on Electrical Machines and Systems, ICEMS 2016. Institute of Electrical and Electronics Engineers Inc., 7837237

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Optimization of the balance between the gate-Drain capacitance and the common source inductance for preventing the oscillatory false triggering of fast switching GaN- FETs

Matsumoto, R., Umetani, K. & Hiraki, E., Nov 3 2017, 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017. Institute of Electrical and Electronics Engineers Inc., Vol. 2017-January. p. 405-412 8 p. 8095811

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Simple analytical derivation of magnetic flux profile eliminating source current ripple and torque ripple of switched reluctance motors for electric vehicle propulsion

Kusumi, T., Hara, T., Umetani, K. & Hiraki, E., May 17 2017, 2017 IEEE Applied Power Electronics Conference and Exposition, APEC 2017. Institute of Electrical and Electronics Engineers Inc., p. 3142-3149 8 p. 7931146

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Simple self-driven synchronous rectifier for resonant inductive coupling wireless power transfer

Koyama, T., Honjo, T., Ishihara, M., Umetani, K. & Hiraki, E., Dec 14 2017, 2017 IEEE International Telecommunications Energy Conference: Driving Innovation in ICT Energy Infrastructure, INTELEC 2017. Institute of Electrical and Electronics Engineers Inc., Vol. 2017-October. p. 363-368 6 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Soft-switching technique applicable to capacitive load for resonant inverter of plasma generator

Itakura, K., Kakemizu, H., Nakaido, H., Umetani, K., Hiraki, E., Ikenari, T. & Kawano, S., Dec 15 2017, Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society. Institute of Electrical and Electronics Engineers Inc., Vol. 2017-January. p. 1556-1562 7 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)
10 Citations (Scopus)
2016
10 Citations (Scopus)

A simple behavior model for switched reluctance motors based on magnetic energy

Hara, T., Kusumi, T., Umetani, K. & Hiraki, E., Jul 13 2016, 2016 IEEE 8th International Power Electronics and Motion Control Conference, IPEMC-ECCE Asia 2016. Institute of Electrical and Electronics Engineers Inc., p. 109-115 7 p. 7512270

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Copper loss analysis based on extremum co-energy principle for high frequency forward transformers with parallel-connected windings

Shirakawa, T., Yamasaki, G., Umetani, K. & Hiraki, E., Dec 21 2016, Proceedings of the IECON 2016 - 42nd Annual Conference of the Industrial Electronics Society. IEEE Computer Society, p. 1099-1105 7 p. 7793013

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Lagrangian derivation and analysis of a simple equivalent circuit model of wireless power transfer system with dual transmitting resonators

Koyama, T., Honjo, T., Umetani, K. & Hiraki, E., Oct 25 2016, 2016 18th European Conference on Power Electronics and Applications, EPE 2016 ECCE Europe. Institute of Electrical and Electronics Engineers Inc., 7695439

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)

Passive regenerative turn-off snubber composed of two diodes and a capacitor for two-phase interleaved boost chopper

Umetani, K., Hiraki, E. & Yamamoto, M., Sep 20 2016, 2015 IEEE International Telecommunications Energy Conference, INTELEC 2015. Institute of Electrical and Electronics Engineers Inc., 7572341. (INTELEC, International Telecommunications Energy Conference (Proceedings); vol. 2016-September).

Research output: Chapter in Book/Report/Conference proceedingConference contribution