1. |
Jun Imaoka, Kenkichiro Okamoto, Masahito Shoyama, Yuki Ishikura, Mostafa Noah, Masayoshi Yamamoto, Modeling, Magnetic Design, Simulation Methods, and Experimental Evaluation of Various Powder Cores Used in Power Converters Considering Their DC Superimposition Characteristics, *IEEE Transactions on Power Electronics*, 10.1109/TPEL.2018.2886044, Volume 34, Issue 9, pp. 9033-9051, 2019.09, Powder cores have been gaining much attention as one of the attractive magnetic cores used in power converters due to their superior features such as high saturation flux density and their capability to suppress fringing flux due to the distributed air gaps. However, powder cores have a unique feature that the relative permeability of the magnetic core varies depending on the magnetic field intensity. The comprehensive modeling of variable relative permeability, design method of powder cores, and computer simulation methods are not well-discussed in the relevant literature. This paper proposes a novel modeling, magnetic design method, and simulation technique considering dc superimposition characteristics of powder cores. The modeling method relies on a simple novel model equation representing the behavior of the variable relative permeability under the dc current superimposition condition, which is helpful to evaluate the performance of powder cores and to properly design various magnetic components. In this evaluation, five different magnetic powder cores are used to show the accuracy and properness of the proposed method. Theoretical analysis has been presented and the effectiveness of the proposed methods has been evaluated through simulation and experimental tests.. |

2. |
M. S. Hassan, Masahito Shoyama, Common-Mode Voltage Investigation and Reduction of Split-Source Inverter, *6th IEEE International Conference on Smart Grid, icSmartGrids 2018
6th IEEE International Conference on Smart Grid, icSmartGrids 2018*, 10.1109/ISGWCP.2018.8634437, 118-122, 2019.02, Common mode voltage (CMV), produced by conventional high-frequency pulsewidth modulated (PWM) voltage source inverters (VSIs), is a major area of interest in applications such as transformerless Photovoltaic (PV) systems, electric motor drives, as well as grid-connected inverters. Since the VSI can only be utilized as a buck inverter, the AC output voltage should be boosted up using an extra boosting stage either in the DC side or in the AC side. So, to reduce the cost, complexity, size, and weight of the converter, the additional boosting stage must be eliminated by using single-stage DC-AC converters, which have the buck-boost feature in a single stage. This paper investigates the induced CMV issue due to a recent single-stage DC-AC inverter topology, split-source inverter (SSI), which has not been comprehensively examined. The CMV waveforms for both VSI and SSI have been analyzed and compared. Furthermore, the paper proposes a discontinuous PWM (DPWM) to alleviate the CMV effect. To check the validity of the proposed analysis, simulations were done using MATLAB/Simulink model. It was shown that a significant CMV reduction could be achieved using the proposed modulation technique.. |

3. |
Baihua Zhang, Shuaitao Zhang, Masahito Shoyama, Eiji Takegami, A simple conducted noise modeling method for DC-DC converters with accurate noise source model, *Research Reports on Information Science and Electrical Engineering of Kyushu University*, 24, 1, 9-15, 2019.01, In this study, a simple conducted noise modeling method based on classical frequency domain modeling concept is developed. Compared with conventional methods, the accuracy of noise source model in the proposed modeling method is improved by using S-shape waveform model with the consideration of high frequency ringing waveforms. The parameters of noise source model are extracted on the basis of experimental measured waveforms. Finally, the accuracy of the proposed conducted noise modeling method is validated on a DC-DC boost converter, the comparison between measured and calculated conducted noise spectra show that the low frequency (0.15 MHz-2 MHz) noise peaks as well as high frequency (10 MHz-30MHz) peak can be accurately predicted.. |

4. |
M. S. Hassan, Masahito Shoyama, Common-mode noise evaluation study of two-level voltage source inverter using bus-clamping discontinuous PWM strategies, *2018 IEEE International Telecommunications Energy Conference, INTELEC 2018
2018 IEEE International Telecommunications Energy Conference, INTELEC 2018 - Proceedings*, 10.1109/INTLEC.2018.8612306, 2019.01, For the common-mode (CM) noise reduction, many literatures have been reported on CM noise reduction using filters, passive or active, and impedance balancing which in both cases, extra devices needed to be added to the circuit that may increase not only the size of the system but also its cost. However, for different pulse width modulation (PWM) techniques, very few studies are available with the perspective of the conducted CM noise as well as common-mode voltage (CMV) reduction in spite of their cost-effective and flexible control advantages. This paper investigates the effect of different Bus-clamping PWM (BCPWM) techniques on the CMV, CM leakage current as well as electromagnetic interference (EMI) noise behavior due to fast switching power devices used in power electronic converters. Conventional space vector PWM (CSVPWM) as well as BCPWM principles are reviewed and their switching sequences are summarized. Timedomain simulations followed by frequency-domain analysis using Fast-Fourier Transform (FFT) algorithm have been carried out and results are presented. It was determined that, the CMV and its subsequent CM noise can be reduced using BCPWM techniques.. |

5. |
Shungo Sakamoto, Masahito Shoyama, Configuration and control method of bi-directional multiport converter for DC power supply system, *2018 IEEE International Telecommunications Energy Conference, INTELEC 2018
2018 IEEE International Telecommunications Energy Conference, INTELEC 2018 - Proceedings*, 10.1109/INTLEC.2018.8612428, 2019.01, This paper propose bi-directional multiport converter as one of the DC power supply system suitable for renewable energy. The seamless power transmission within a certain voltage range can be realized by using bi-directional multiport converter. Moreover, a circuit configuration and control method of bi-directional multiport converter are included. The effectiveness of the proposed converter and control method has been investigated analytically by simulation and experiment on power transmission.. |

6. |
Baihua Zhang, Qiang Lin, Jun Imaoka, Masahito Shoyama, Satoshi Tomioka, Eiji Takegami, EMI prediction and reduction of zero-crossing noise in totem-pole bridgeless PFC converters, *Journal of Power Electronics*, 10.6113/JPE.2019.19.1.278, 19, 1, 278-287, 2019.01, In this study, a zero-crossing spike current issue in a totem-pole bridgeless power factor correction (PFC) converter is comprehensively investigated for the first time. Spike current occurs when input voltage crosses zero, becomes a noise source, and causes severe common mode emission issues. A generation mechanism for electromagnetic interference (EMI) is presented to investigate the EMI problem caused by zero-crossing issue, and a noise spectrum due to this issue is predicted by a theoretical analysis based on the Fourier coefficient of an approximate spike current waveform. Furthermore, a noise reduction method is proposed and then improved to reduce the spike current. Experimental measurements are implemented on a GaN-based totem-pole bridgeless PFC converter, and the spike current can be effectively suppressed through the proposed method. Furthermore, the noise spectrums measured without and with the reduced zero-crossing spike current are compared. Experimental results validate the analysis of the noise spectrum caused by the zero-crossing spike current issue.. |

7. |
Mokhtar Aly, Emad M. Ahmed, Masahito Shoyama, Ageing Mitigation Control Method for Power Devices in Multilevel Inverters in Standalone PV Systems, *10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018
2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018*, 10.1109/ECCE.2018.8557707, 5737-5741, 2018.12, Multilevel inverters (MIs) have become widely used in photovoltaic (PV) systems for their high efficiency, reduced leakage currents, and reduced EMI levels. Although MIs suffer from unequal thermal stresses in power devices that lead to aging of power device with their continuous operation. Therefore, this paper proposes a new aging mitigation control (AMC) method to enhance the reliability of MIs against the aging effects in power devices. The operation of the proposed AMC method has three operating modes that are adapted according to the level and type of aging. In small and medium aging levels, the proposed method preserves the full output power ratings of the inverter with maximum energy extraction from PV modules. Whereas, in high aging level region and multiple devices failures, the proposed method reduces the output power so as to maintain continuous operation of the inverter without harmful consequences. The simulation and experimental results with comparisons to conventional methods show effective performance of the proposed AMC method.. |

8. |
Atsushi Mishima, Reo Takiguchi, Jun Imaoka, Masahito Shoyama, Akihiro Yamaguchi, Tomonori Kimura, Current-Mode Digital Control Method for High Frequency DC-DC Converter with Reduced Number of Sampling in One Switching Cycle, *10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018
2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018*, 10.1109/ECCE.2018.8557393, 1423-1427, 2018.12, In recent years, switching frequency of Switched-Mode Power Supplies (SMPS) has been getting higher and digital control circuits are adopted for the purpose of downsizing and weight reduction. In addition, current-mode control has attracted attention because of its advantages: high speed response and high stability. However, it is difficult to realize current-mode control with digital control circuit that needs to grasp current behavior in real time because sampling frequency is not enough high for switching frequency. In this paper, we will propose a novel current-mode digital control method that predict current behavior with output voltage and previous current sampling data of SMPS and prove its effectiveness in simulation.. |

9. |
Mokhtar Aly, Emad Ahmed, Masahito Shoyama, A New Single Phase Five-Level Inverter Topology for Single and Multiple Switches Fault Tolerance, *IEEE Transactions on Power Electronics*, Volume 33, Issue 11, pp. 9198-9208, 2018.11. |

10. |
Jun Imaoka, Masahito Shoyama, A Leakage Flux Cancellation Technique for Series-Parallel Combined Resonant Circuits with Asymmetric Rotary Transformers Used for Ultrasonic Spindle Drive, *8th International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018
2018 International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018*, 10.23919/IPEC.2018.8507729, 1554-1561, 2018.10, This paper proposes a novel leakage flux cancellation technique suitable for series-parallel combined resonant circuits with asymmetric rotary transformer used for ultrasonic spindles drive. An asymmetric rotary transformer is utilized in the ultrasonic spindle in order to realize automated tool change. However, an asymmetric rotary transformer is likely to occur much leakage fluxes in secondly core due to asymmetric core structures. This large leakage inductance affects a drive circuit using a series-parallel combined resonant circuit, and the resonant characteristics in the drive circuit become very steep. In this state, the resonance circuit does not realize the desired function when the drive frequency fluctuates or the error of resonance parameters occurs. Therefore, this paper proposes a novel leakage flux cancellation technique used for ultrasonic spindle drive. The effectiveness of the proposed method is discussed from the theoretical analysis and experimental test.. |

11. |
Ryo Ute, Kazuya Fujiwara, Jun Imaoka, Masahito Shoyama, Limit Operating Frequency of Peak Current-Mode Control DC-DC Converter Considering Turn-Off Delay Time, *8th International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018
2018 International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018*, 10.23919/IPEC.2018.8507512, 3773-3779, 2018.10, The aim of this paper is to present the mechanism of the frequency dividing operation and the limit operating frequency in the peak current-mode control DC-DC converter considering the turn-off delay time. The peak current mode control has the higher stability and the responsiveness than the conventional voltage mode control. However, if the switching frequency is increased ignoring the turn-off delay time, it would become the frequency dividing operation that the switching frequency operates lower than the clock frequency at the certain frequency. In this operation, there is a problem that the switching loss increases and the high frequency switching drive is hindered. In this paper, we clarified the mechanism of the dividing frequency operation and derived the relationship between the turn-off delay time and the limit operating frequency. Also, we derived the relationship when the slope compensation is applied as well. As experimental results, when there is the turn-off delay time, it was confirmed that the limit operating frequency of the DC-DC converter was limited to lower as the duty ratio was lower and the slope ratio of the slope compensation is close to 1.0.. |

12. |
Jun Imaoka, Kenkichiro Okamoto, Masahito Shoyama, Yuki Ishikura, Mostafa Noah, Masayoshi Yamamoto, Modeling, Magnetic Design, and Simulation Methods Considering DC Superimposition Characteristic of Powder Cores Used in Power Converters, *8th International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018
2018 International Power Electronics Conference, IPEC-Niigata - ECCE Asia 2018*, 10.23919/IPEC.2018.8507874, 1095-1102, 2018.10, Powder cores have been gained much attention as one of the attractive magnetic cores used in power converters due to their superior features such as high saturation flux density or distributed air gaps. However, powder cores have a unique feature that the relative permeability of the magnetic core varies depending on the magnetic field intensity. However, modeling the variable relative permeability, the design method for powder cores, and computer simulation methods of non-linear inductance are well not discussed in the related literature. Therefore, this paper proposes a novel modeling, magnetic design methods, and simulation technique considering dc superimposition characteristics of powder cores. The modeling method uses a novel model equation representing the behavior of relative permeability under the dc current superimposition condition, which is helpful to evaluate the performance of powder cores and to properly design various magnetic components. Theoretical analysis has been presented and the effectiveness and the validity of the proposed methods are evaluated through simulation and experimental tests.. |

13. |
Mahmoud A. Gaafar, Gamal M. Dousoky, Emad M. Ahmed, Masahito Shoyama, Mohamed Orabi, New design approach for grid-current-based active damping of LCL filter resonance in grid-connected converters, *Journal of Power Electronics*, 10.6113/JPE.2018.18.4.1165, 18, 4, 1165-1177, 2018.07, This paper investigates the active damping of grid-connected LCL filter resonance using high-pass filter (HPF) of the grid current. An expression for such HPF is derived in terms of the filter components. This expression facilitates a general study of the actively damped filter behavior in the discrete time domain. Limits for the HPF parameters are derived to avoid the excitation of unstable open loop poles since such excitation can reduce both the damping performance and the system robustness. Based on this study, straightforward co-design steps for the active damping loop along with the fundamental current regulator are proposed. A numerical example along with simulation and experimental results are presented to verify the theoretical analyses.. |

14. |
Jun Imaoka, Kenkichiro Okamoto, Shota Kimura, Mostafa Noah, Wilmar Martinez, Masayoshi Yamamoto, Masahito Shoyama, A Magnetic Design Method Considering DC-Biased Magnetization for Integrated Magnetic Components Used in Multiphase Boost Converters, *IEEE Transactions on Power Electronics*, vol.33, iss.4, pp.3346-3362, 2018.04. |

15. |
Mokhtar Aly, Emad M. Ahmed, Mohamed Orabi, Masahito Shoyama, An enhanced PWM method for loss balancing of five level T-type inverter in PV systems, *33rd Annual IEEE Applied Power Electronics Conference and Exposition (APEC) 2018*, pp.2530-2535, 2018.03. |

16. |
Mokhtar Aly, Emad M. Ahmed, Masahito Shoyama, Thermal stresses relief carrier-based PWM strategy for single-phase multilevel inverters, *IEEE Transactions on Power Electronics*, vol.32, iss.12, pp.9376-9388, 2017.12. |

17. |
Mokhtar Aly, Emad M. Ahmed, Masahito Shoyama, An improved model predictive controller for highly reliable grid connected photovoltaic multilevel inverters, *39th IEEE International Telecommunications Energy Conference (INTELEC) 2017*, pp.450-455, 2017.10. |

18. |
Baihua Zhang, Qiang Lin, Jun Imaoka, Masahito Shoyama, Satoshi Tomioka, Eiji Takegami, Conducted noise prediction for zero-crossing issue in totem-pole bridgeless PFC converter, *39th IEEE International Telecommunications Energy Conference (INTELEC) 2017*, pp.396-401, 2017.10. |

19. |
Mokhtar Aly, Emad M. Ahmed, Masahito Shoyama, Developing new lifetime prolongation SVM algorithm for multilevel inverters with thermally aged power devices, *IET Power Electronics*, vol.10, iss.15, pp.2248-2256, 2017.10. |

20. |
Jun Imaoka, Kenkichiro Okamoto, Masahito Shoyama, Mostafa Noah, Shota Kimura, Masayoshi Yamamoto, A high-Reliable magnetic design method for three-Phase coupled inductor used in interleaved multi-Phase boost converters, *9th Annual IEEE Energy Conversion Congress and Exposition (ECCE) 2017*, pp.873-880, 2017.10. |

21. |
Masahito Shoyama, Takuma Sagara, Yusuke Yamashita, Jun Imaoka, Yu Yonezawa, Yoshiyasu Nakashima, Derivation of transfer function of LLC current resonant converter using numerical calculation, *9th Annual IEEE Energy Conversion Congress and Exposition (ECCE) 2017*, pp.3056-3062, 2017.10. |

22. |
Mokhtar Aly, Emad M. Ahmed, M. Shoyama, Thermal and Reliability Assessment for Wind Energy Systems with DSTATCOM Functionality in Resilient Microgrids, *IEEE Transactions on Sustainable Energy*, Vol.8, No.3, pp.953-965, 2017.07. |

23. |
Mokhtar Aly, Emad M. Ahmed, Masahito Shoyama, A new real-time perfect condition monitoring for high-power converters, *3rd IEEE International Future Energy Electronics Conference (IFEEC) - ECCE Asia 2017-*, pp.1473-1477, 2017.06. |

24. |
Jun Imaoka, Myoungsik Nam, Masahito Shoyama, Hideaki Fujita, Design of series-parallel combined resonant circuit with rotary transformer used for ultrasonic spindle drive, *3rd IEEE International Future Energy Electronics Conference (IFEEC) - ECCE Asia 2017-*, pp.2244-2249, 2017.06. |

25. |
Jun Imaoka, Kenkichiro Okamoto, Masahito Shoyama, Daigoro Ebisumoto, Shota Kimura, Mostafa Noah, Masayoshi Yamamoto, Magnetic design and experimental evaluation of Integrated Magnetic Components used in Interleaved Multi-phase DC/DC converter with Phase Drive Control, *3rd IEEE International Future Energy Electronics Conference (IFEEC) - ECCE Asia 2017-*, pp.2192-2197, 2017.06. |

26. |
Baihua Zhang, Jun Imaoka, Masahito Shoyama, Satoshi Tomioka, Eiji Takegami, Study on zero-crossing conducted noise issue of totem-pole bridgeless PFC converter, *3rd IEEE International Future Energy Electronics Conference (IFEEC) - ECCE Asia 2017-*, pp.2233-2237, 2017.06. |

27. |
Mahmoud A. Gaafar, Gamal M. Dousoky, Emad M. Ahmed, M. Shoyama, Systematic Design of Grid-Current-Based Active Damping for Grid-Connected LCL Filters, *IEEE APEC 2017*, pp.2652-2657, 2017.03. |

28. |
Gamal M. Dousoky, M. Shoyama, New Parameter for Current-Sensorless MPPT in Grid-Connected Photovoltaic VSIs, *Solar Energy Journal (Elsevier)*, Vol.143, pp.113-119, 2017.02. |

29. |
Gamal M. Dousoky, M. Shoyama, An AC MPPT with Active/Reactive Power Control Feature for Single-Stage Three-Phase Grid-Connected Photovoltaic VSIs, *Electric Power Components & Systems Journal (Taylor & Francis)*, Vol.45, No.4, pp.442-450, 2017.01. |

30. |
Mokhtar Aly, Gamal M. Dousoky, M. Shoyama, An Overheating-Tolerant Space Vector Modulation Algorithm for Multilevel Inverters, *IEEJ Transactions on Electrical and Electronic Engineering*, 10.1002/tee.22338, Vol.11, No. 2, pp. 75-S83, 2016.12. |

31. |
T. Ota, Jun Imaoka, M. Shoyama, H. Onishi, S. Nagaoka, S. Morishita, Analysis and Design Method of ZCS DC-DC Converter in Consideration of the Parasitic Capacitance of Switch and Its Effect on Loss Reduction, *IEEE 2nd Southern Power Electronics Conference (SPEC)*, No.297, 2016.12. |

32. |
Jun Imaoka, K. Okamoto, D. Ebisumoto, S. Kimura, M. Yamamoto, M. Shoyama, A Novel Design Method of Integrated Magnetic Components Used in Two-phase Interleaved Converter with Phase Drive Control, *The 3rd Symposium on Semiconductor Power Conversion (S2PC)*, pp.52-53, 2016.10. |

33. |
Donny Radianto，M. Shoyama, Improved Incremental Conductance Based Maximum Power Point Tracking of Photovoltaic System, *International Journal on Energy Conversion (I.R.E.CON.)*, Vol.4, No.5, pp.139-143, 2016.09. |

34. |
Mokhtar Aly, Gamal M. Dousoky, Emad M. Ahmed, M. Shoyama, A Unified SVM Algorithm for Lifetime Prolongation of Thermally-Overheated Power Devices in Multi-Level Inverters, *IEEE ECCE 2016 (Energy Conversion Congress and Exposition)*, S24-1, pp.1-6, 2016.09. |

35. |
Mahmoud A. Gaafar, M. Shoyama, Design and Analysis of Observer-Based Active Damping for LCL Filter Resonance, *システム情報科学府紀要*, Vol.21, No.2, pp.39-44, 2016.07. |

36. |
Mahmoud A. Gaafar, Emad M. Ahmed, M. Shoyama, A Two State Feedback Active Damping Strategy for the LCL Filter Resonance in Grid-Connected Converters, *Journal of Power Electronics (JPE)*, Vol.16, No.4, pp.1587-1597, 2016.07. |

37. |
Baihua Zhang, Qiang Lin, Y. Shimada, Jun Imaoka, M. Shoyama, S. Tomioka, Analysis and Reduction Method of Conducted Noise in GaN HEMTs based Totem-pole Bridgeless PFC Converter, *IEEE 8th IPEMC 2016-ECCE Asia*, Mb1-07, 2016.05. |

38. |
Mitsuru Sato, Reo Takiguchi, Jun Imaoka, M. Shoyama, A Novel Secondary PWM-Controlled interleaved LLC Resonant Converter for Load Current Sharing, *IEEE 8th IPEMC 2016-ECCE Asia*, P207, 2016.05. |

39. |
Mahmoud A. Gaafar，Gamal M. Dousoky，M. Shoyama, New Active Damping Method for LCL Filter Resonance Based on Two Feedback System, *IEEE APEC 2016*, pp.2735-2741, 2016.03. |

40. |
Donny Radianto，Gamal M. Dousoky，M. Shoyama, Design and Implementation of Fast PWM Boost Converter Based on Low Cost Microcontroller for Photovoltaic Systems, *IEEE IECON 2015 (The 41st Annual Conference of the IEEE Industrial Electronics Society)*, pp.2325-2328, 2015.11. |

41. |
Mokhtar Aly，Gamal M. Dousoky，M. Shoyama, Lifetime-Oriented SVPWM for Thermally-Overloaded Power Devices in Three-Level lnverters, *IEEE IECON 2015 (The 42st Annual Conference of the IEEE Industrial Electronics Society)*, pp.3614-3619, 2015.11. |

42. |
Mahmoud A. Gaafar，Gamal M. Dousoky，M. Shoyama, Dual Feedback Active Damping Method for Grid-Connected LCL Filter Resonance, *IEEE IECON 2015 (The 43st Annual Conference of the IEEE Industrial Electronics Society)*, pp.3821-3826, 2015.11. |

43. |
Mokhtar Aly，Gamal M. Dousoky，M. Shoyama, Reliability Enhancement of Multilevel Inverters through SVPWM-Based Thermal Management Methodology, *IEEE IFEEC 2015 (2nd International Future Energy Electronics Conference)*, 10.1109/IFEEC.2015.7361605 , DC1, No.290469, 2015.11. |

44. |
S. Ida，Gamal M. Dousoky，M. Shoyama，T. Yamashita, Performance Evaluation of Surge Energy Regenerative Two-Switch Power Supply with TEC values, *IEEE IFEEC 2015 (2nd International Future Energy Electronics Conference)*, 10.1109/IFEEC.2015.7361444 , PE6, No.290182, 2015.11. |

45. |
Donny Radianto，M. Shoyama, ANFIS Based Maximum Power Point Tracking Method for Photovoltaic System Using a Two-Phase Interleaved Boost Converter, *International Review of Automatic Control (IREACO)*, Vol.8, No.6, pp.418-424, 2015.11. |

46. |
Donny Radianto，Gamal M. Dousoky，M. Shoyama, MPPT Based on Incremental Conductance-Fuzzy Logic Algorithm for PhotovoItaic System under Variable Climate Conditions, *IEEE INTELEC 2015 (37th International Telecommunications Energy Conference)*, TS31-1, pp.728-732, 2015.10. |

47. |
Mokhtar Aly，Gamal M. Dousoky，M. Shoyama, Design and Validation of SVPWM Algorithm for Thermal Protection of T-Type Three-Level Inverters, *IEEE INTELEC 2015 (37th International Telecommunications Energy Conference)*, PS08-39, pp.1074-1079, 2015.10. |

48. |
Mahmoud A. Gaafar，Gamal M. Dousoky，M. Shoyama, Robustness Analysis for Observer Based Active Damping of LCL Filter at Different Resonant Frequencies, *IEEE INTELEC 2015 (37th International Telecommunications Energy Conference)*, TS07-2, pp.173-178, 2015.10. |

49. |
M. Sato，Gamal M. Dousoky，M. Shoyama, Improved Digital Control Scheme of Synchronous Rectification for Resonant Converter at Light Load Conditions, *IEEE INTELEC 2015 (37th International Telecommunications Energy Conference)*, TS19-5, pp.457-461, 2015.10. |

50. |
T. Takahashi，M. Miyamoto，Gamal M. Dousoky，M. Shoyama, Droop Control for Bi-Directional DC-DC Converters Used in Multi-Level Virtual Conductors, *IEEE INTELEC 2015 (37th International Telecommunications Energy Conference)*, TS25-2, pp.600-605, 2015.10. |

51. |
B. Zhang，K. Shi，Q. Lin，Gamal M. Dousoky，M. Shoyama，S. Tomioka, Conducted Noise Reduction of Totem-pole Bridgeless PFC Converter Using GaN HEMTs, *IEEE INTELEC 2015 (37th International Telecommunications Energy Conference)*, TS13-2, pp.320-324, 2015.10. |

52. |
Yuki Inoue, Yafei Gao, Masahito Shoyama, Hideaki Fujita, Application of Wireless Electromagnetic Resonance Technology to Rotary Transformer Used in Ultrasonic Spindle, *9th International Conference on Power Electronics (ICPE) - ECCE Asia*, ThE2-1, 2015.06. |

53. |
Hegazy Rezk Ahmed Hussien, Masahito Shoyama, Techno-economic Optimum Sizing of Stand-alone Photovoltaic/Fuel Cell Renewable System for Irrigation Water Pumping Applications, *IEEE PECON 2014 (International Conference on Power & Energy)*, 3A-4, 2014.12. |

54. |
Mokhtar Aly, Masahito Shoyama, An Efficient Neutral Point Voltage Control Algorithm with Reduced Switching Losses for Three Level Inverters, *IEEE PECON 2014 (International Conference on Power & Energy)*, 4C-3, 2014.12. |

55. |
Kewei Shi, Masahito Shoyama, Satoshi Tomioka, Common Mode Noise Reduction in Totem-pole Bridgeless PFC Converter, *IEEE PEAC 2014 (International Power Electronics and Application Conference and Exposition )*, pp.705-709, 2014.11. |

56. |
Donny Radianto, Masahito Shoyama, Neural Network Based a Two Phase Interleaved Boost Converter for Photovoltaic System, *ICRERA 2014 (3rd International Conference on Renewable Energy Research and Applications)*, No.148, 2014.10. |

57. |
Mahmoud A. Gaafar, Masahito Shoyama, Active Damping for Grid-Connected LCL Filter based on Optimum Controller Design using Injected Grid Current Feedback Only, *IEEE ECCE 2014 (Energy Conversion Congress and Exposition)*, pp.3628-3633, 2014.09. |

58. |
Husam A. Ramadan, Masahito Shoyama, A Unified Model for the Multi-level Virtual Conductor, *IEEE INTELEC 2014 (36th International Telecommunications Energy Conference)*, PO-27, 2014.09. |

59. |
Mahmoud A. Gaafar, Masahito Shoyama, Active Damping for Grid-Connected LCL Filter Based on Optimum P+R Controller Design Using Injected Grid Current Feedback Only, *IEEE INTELEC 2014 (36th International Telecommunications Energy Conference)*, PO-34, 2014.09. |

60. |
Husam A. Ramadan, Yasutaka Imamura, Sihun Yang, Masahito Shoyama, Stability Considerations for DC Power Systems with Multi-level Virtual Conductors, *システム情報科学府紀要*, Vol.19, No.2, pp.41-46, 2014.09. |

61. |
Husam A. Ramadan, Yasutaka Imamura, Sihun Yang, Masahito Shoyama, Performance of a Virtual Conductor in Dc Power Systems Using a Controlled Bidirectional DC-DC Converter, *International Journal of Innovative Research in Electrical, Electronics, Instrumentation and Control Engineering, Vol. 2, Issue 9*, pp.2002-2008, 2014.09. |

62. |
Husam A. Ramadan, Yasutaka Imamura, Sihun Yang, Masahito Shoyama, A Unified Dynamic Model for Bi-directional DC-DC Converter, *International Journal of Enhanced Research in Science Technology & Engineering*, Vol.3, Issue 9, pp.228-238, 2014.09. |

63. |
Donny Radianto, Masahito Shoyama, Anfis Based A Two-Phase Interleaved Boost Converter For Photovoltaic System, *IEEE INTECH 2014 (4th International Conference on the Innovative Computing Technology)*, pp.19-24, 2014.08. |

64. |
Husam A. Ramadan, Yasutaka Imamura, Sihun Yang, Masahito Shoyama, A New Stability Assessment Criterion for DC Power Systems Using Multi-level Virtual Conductors, *IEEE COMPEL 2014 (15th IEEE Workshop on Control and Modeling for Power Electronics)*, pp.1-5, 2014.06. |

65. |
Xiaochen Zhang, Masahito Shoyama, Common-Mode Noise Reduction with Two Symmetrical Three-Phase Inverters, *IEICE 2014 International Symposium on Electromagnetic Compatibility, EMC’14/Tokyo*, 13A1-A4, pp.61-64, 2014.05. |

66. |
Kewei Shi, Masahito Shoyama, Satoshi Tomioka, A Study of Common Mode Noise Current of Bridgeless PFC Circuit Considering Voltage Change in Y-Capacitors, *IEICE 2014 International Symposium on Electromagnetic Compatibility, EMC’14/Tokyo*, 13A2-A3, pp.73-76, 2014.05. |

67. |
Husam A. Ramadan, Yasutaka Imamura, Konosuke Kawachi, Sihun Yang, Masahito Shoyama, A Multi-Level Virtual Conductor as a Backbone of a DC Power Routing System, *2014 International Power Electronics Conference, IPEC-Hiroshima 2014 -ECCE Asia-*, pp.863-867, 2014.05. |

68. |
Haruomi Takashita, Masahito Shoyama, Yu Yonezawa, Yoshiyasu Nakashima, Efficiency Improvement of Power Supply with Transient Current Circuit Using Digital Control, *2014 International Power Electronics Conference, IPEC-Hiroshima 2014 -ECCE Asia-*, pp.3386-3391, 2014.05. |

69. |
Gamal M. Dousoky, Masahito Shoyama, Haitham Abu‐Rub, Dual-Mode Controller for MPPT in Single-Stage Grid-Connected Photovoltaic Inverters, *IEEE IECON 2013 (The 39th Annual Conference of the IEEE Industrial Electronics Society)*, pp.663-668, 2013.11. |

70. |
Gamal M. Dousoky, Masahito Shoyama, DSP-Based Simple and Efficient Synchronizer for Three-Phase Grid-Connected Renewable Energy Systems, *IEEE IFEEC 2013 (1st International Future Energy Electronics Conference)*, pp.411-415, 2013.11. |

71. |
Husam A. Ramadan, Yasutaka Imamura, Konosuke Kawachi, Sihun Yang, Masahito Shoyama, Multi-level Virtual Conductor Using Bidirectional DC-DC Converters, *IEEE INTELEC 2013 (35th International Telecommunications Energy Conference)*, pp.2757-2763, 2013.10. |

72. |
Gamal M. Dousoky, Masahito Shoyama, Current-Sensorless Power-Angle-Based MPPT for Single-Stage Grid-Connected Photovoltaic, *IEEE ECCE 2013 (Energy Conversion Congress and Exposition)*, pp.105-109, 2013.09. |

73. |
Emad M. Ahmed, Mohamed Orabi, Shoyama Masahito, High Efficient Variable step Size Incremental Resistance Maximum Power Point Tracker for PV, *IEEE ECCE 2013 (Energy Conversion Congress and Exposition)*, pp.2435-2439, 2013.09. |

74. |
Yasutaka Imamura, Husam A. Ramadan, Sihun Yang, Gamal M. Dousoky, Masahito Shoyama, Seamless Dynamic Model for DC-DC Converters Applicable to Bi-directional Power Transfer, *EPE 2013 ECCE Europe (the 15th European Conference on Power Electronics and Applications)*, pp.1-10, 2013.09. |

75. |
Yusuke Kawamura, Masahito Shoyama, Wireless Power Transmission Using LC Cancellation, *2013 IEEE ECCE ASIA DownUnder, June 2013*, No. 10-3-2, pp. 1041-1045, 2013.06. |

76. |
Seiya Abe, Toshiyuki Zaitsu, Junichi Yamamoto, Shinji Ueda, Sihun Yang, Masahito Shoyama, Tamotsu Ninomiya, Consideration of Current Resonant Converter Topology for Bi-Directional Applications, *The 10th IEEE International Conference on Power Electronics and Drive Systems (PEDS 2013)*, A2L-A.2, pp.153-158, 2013.04. |

77. |
Kiyoshi Masumoto, Kewei Shi, Masahito Shoyama, Satoshi Tomioka, Comparative Study on Efficiency and Switching Noise of Bridgeless PFC Circuits, *The 10th IEEE International Conference on Power Electronics and Drive Systems (PEDS 2013)*, B3P-L.8, pp.613-618, 2013.04. |

78. |
Yasutaka Imamura, Husam A. Ramadan, Sihun Yang, Gamal M. Dousoky, Masahito Shoyama, Seamless Dynamic Model for Bi-Directional DC-DC Converter, *The 10th IEEE International Conference on Power Electronics and Drive Systems (PEDS 2013)*, B4L-F.3, pp.1109-1113, 2013.04. |

79. |
Seiya Abe, Sihun Yang, Masahito Shoyama, Yoichi Ishizuka, Tamotsu Ninomiya, Masato Kaga, Prototype Evaluation of Over 10W/cm^3 High Power Density Converter for 400VDC Power Distribution System in Data Center, *The 10th IEEE International Conference on Power Electronics and Drive Systems (PEDS 2013)*, C2L-A.3, pp.1280-1284, 2013.04. |

80. |
Seiya Abe, Toshiyuki Zaitsu, Junichi Yamamoto, Shinji Ueda, Sihun Yang, Masahito Shoyama, Tamotsu Ninomiya, Adaptive Driving of Synchronous Rectifier for LLC Converter Without Signal Sensing, *IEEE APEC 2013*, pp.1370-1375, 2013.03. |

81. |
Gamal M. Dousoky, Masahito Shoyama, Development of Eco-friendly Photovoltaic Energy Systems Through "Energy Efficiency" Technology - A Roadmap and an Application in Egypt and Japan, *ICEST2013*, pp.79-90, 2013.02. |

82. |
Gamal M. Dousoky, Emad M. Ahmed, Masahito Shoyama, MPPT Schemes for Single-Stage Three-Phase Grid-Connected Photovoltaic Voltage-Source Inverters, *ICIT 2012*, pp.600-605, 2013.02. |

83. |
Sihun Yang, Seiya Abe, Toshiyuki Zaitsu, Junichi Yamamoto, Masahito Shoyama, Tamotsu Ninomiya, Consideration of Operating Characteristics for Bi-directional LLC Resonant Converter, *International Journal of Renewable Energy Research*, Vol.2, No.4, pp.790-796, 2013.01. |

84. |
Kiyoshi Masumoto, Masahito Shoyama, Comparative Study about Efficiency and Switching Noise of Bridgeless PFC Circuits, *ICRERA 2012*, 2012.11. |

85. |
Sihun Yang, Seiya Abe, Toshiyuki Zaitsu, Junichi Yamamoto, Masahito Shoyama, Tamotsu Ninomiya, Detail Operating Characteristics of Bi-directional LLC Resonant Converter, *ICRERA 2012*, 2012.11. |

86. |
Seiya Abe, Toshiyuki Zaitsu, Junichi Yamamoto, Sihun Yang, Masahito Shoyama, Tamotsu Ninomiya, AC Analysis of Symmetry and Asymmetry Bi-directional Current Resonant Converter, *ICRERA 2012*, 2012.11. |

87. |
Sihun Yang, Kenta Goto, Yasutaka Imamura, Masahito Shoyama, Dynamic Characteristics Model of Bi-Directional DC-DC Converter Using State-Space Averaging Method, *IEEE INTELEC 2012*, Program #19.2, 2012.10. |

88. |
Seiya Abe, Toshiyuki Zaitsu, Junichi Yamamoto, Shinji Ueda, Sihun Yang, Masahito Shoyama, Tamotsu Ninomiya, Operating Characteristics of Push-Pull Type Series Resonant DC-DC Converter with Synchronous Rectifier, *IEEE INTELEC 2012*, Program #1.4, 2012.10. |

89. |
Seiya Abe, Toshiyuki Zaitsu, Junichi Yamamoto, Shinji Ueda, Sihun Yang, Masahito Shoyama, Tamotsu Ninomiya, Sensing-Less Drive of Synchronous Rectifier for LLC Resonant Converter, *IEEE INTELEC 2012*, Program #22.2, 2012.10. |

90. |
Sihun Yang, Seiya Abe, Masahito Shoyama, Design consideration of Low-Profile LLC Resonant Converter for Reducing Temperature of The Transformer, *システム情報科学府紀要*, Vol.17, No.2, pp.49-54, 2012.09. |

91. |
Gamal M. Dousoky, Emad M. Ahmed, Masahito Shoyama, Current-Sensorless MPPT with DC-DC Boost Converter for Photovoltaic Battery Chargers, *IEEE ECCE 2012*, pp.1607-1614, 2012.09. |

92. |
Gamal M. Dousoky, Abou-Hashema M. El-Sayed, Masahito Shoyama, Increasing Energy-Efficiency in Solar Radiation Trackers for Photovoltaic Arrays, *IEEE ECCE 2012*, pp.4113-4120, 2012.09. |

93. |
Seiya ABE, Sihun YANG, Masahito Shoyama, Tamotsu NINOMIYA, Akira MATSUMOTO, Akiyoshi FUKUI, Malfuntion Issue of SiC-SIT Based DC Circuit Breaker in 400V DC Power Distribution Systems for Data Centers, *IEICE Trans. on Commun.*, Vol.E95-B, No.6, pp.1990-1996, 2012.06. |

94. |
Gamal M. Dousoky, Emad M. Ahmed, Masahito Shoyama, An Adaptive Frequency Hopping Technique for Conducted-Noise Reduction in DC-DC Converters, *IEEE 7th IPEMC 2012-ECCE Asia*, pp.1761-1765, 2012.06. |

95. |
Emad M. Ahmed, Gamal M. Dousoky, Masahito Shoyama, On the Behaviour of Marine and Tidal Current Converters with DC-DC Boost Converter, *IEEE 7th IPEMC 2012-ECCE Asia*, pp.2250-2254, 2012.06. |

96. |
Emad M. Ahmed, Masahito Shoyama, Enhancing the Performance of the Marine and Tidal Current Converters Using DC-DC Boost Converter, *Journal of Energy and Power Engineering, Vol. 6, No. 3, pp. 478-484, Mar. 2012*, 2012.03. |

97. |
Seiya Abe, Sihun Yang, Masahito Shoyama, Tamotsu Ninomiya, Akira Matsumoto, Akiyoshi Fukui, Operating Mechanism of SiC-SIT DC Circuit Breaker in 400V-DC Power Supply System for Data Center --In Case of Grounding Fault--, *IEEE APEC 2012, pp.2189-2194, Feb. 2011*, 2012.02. |

98. |
Emad M. Ahmed, Masahito Shoyama, Scaling Factor Design Based Variable Step Size Incremental Resistance Maximum Power Point Tracking for PV Systems, *Journal of Power Electronics (JPE)*, Vol.12, No.1, pp.164-171, 2012.01. |

99. |
Emad M. Ahmed, Masahito Shoyama, Scaling Factor Design Issues in Variable Step Size Incremental Resistance MPPT in PV systems, *9th International Conference on Power Electronics and Drive Systems (PEDS 2011), Dec. 2011*, pp.889-894, 2011.12. |

100. |
Seiya Abe, Sihun Yang, Masahito Shoyama, Tamotsu Ninomiya, Akira Matsumoto, Akiyoshi Fukui, Malfunction Analysis of SiC-SIT DC Circuit Breaker in 400V-DC Power Supply System, *9th International Conference on Power Electronics and Drive Systems (PEDS 2011), Dec. 2011*, pp.109-114, 2011.12. |

101. |
Emad M. Ahmed, Masahito Shoyama, Novel Stability Analysis of Variable Step Size Incremental Resistance INR MPPT for PV systems, *IEEE International Conf. on Industrial Electronics, Control and Instrumentation (IECON 2011), Nov. 2011*, pp. 3761-3766, 2011.11. |

102. |
Gamal M. Dousoky, Abou-Hashema M. El-Sayed, Masahito Shoyama, Improved Orientation Strategy for Energy-Efficiency in Photovoltaic Panels, *Journal of Power Electronics (JPE), Vol.11, No.3, pp. 335-341, May 2011*, 2011.05. |

103. |
Emad M. Ahmed, Masahito Shoyama, New Single Current Sensor Based Variable Step Size MPPT for Stand-alone Battery Storage PV Systems, *PCIM 2010 (in Nurnberg, Germany), pp.381-387, May 2011*, 2011.05. |

104. |
Emad M. Ahmed, Masahito Shoyama, Stability Study of Variable Step Size Incremental Conductance/Impedance MPPT for PV systems, *8th International Conference on Power Electronics (ICPE 2011) - ECCE Asia, May-Jun. 2011*, TuB2-3, 2011.05. |

105. |
Sihun Yang, Seiya Abe, Masahito Shoyama, Design Consideration of Two Flat Transformers in a Low-Profile LLC Resonant Converter, *8th International Conference on Power Electronics (ICPE 2011) - ECCE Asia, May-Jun. 2011*, WeA2-3, 2011.05. |

106. |
Gamal M. Dousoky, Abou-Hashema M. El-Sayed, Masahito Shoyama, Maximizing Energy-Efficiency in Single-Axis Solar Trackers for Photovoltaic Panels, *8th International Conference on Power Electronics (ICPE 2011) - ECCE Asia, May-Jun. 2011*, ThF1-1, 2011.05. |

107. |
Emad M. Ahmed, Masahito Shoyama, Variable Step Size Maximum Power Point Tracker Using a Single Variable for Stand-alone Battery Storage PV Systems, *IEEE ICIT-SSST 2011 (in Auburn，Alabama, USA; Electronic Presentation), Mar. 2011*, 2011.03. |

108. |
Emad M. Ahmed, Masahito Shoyama, Variable Step Size Maximum Power Point Tracker Using Single Variable for Stand-alone Battery Storage PV Systems, *Journal of Power Electronics (JPE), Vol.11, No.2, pp. 218-227, Mar. 2011*, 2011.03. |

109. |
Seiya Abe, Sihun Yang, Mariko Ogawa, Masahito Shoyama, Tamotsu Ninomiya, Akira Matsumoto, Akiyoshi Fukui, Malfunction Issue of SiC-SIT DC Circuit Breaker in HVDC Power Supply System, *IEEE APEC 2011, D10.16, Mar. 2011*, 2011.03. |

110. |
Gamal M. Dousoky, Masahito Shoyama, Tamotsu Ninomiya, FPGA-Based Spread-Spectrum Schemes for Conducted-Noise Mitigation in DC-DC Power Converters: Design, Implementation,, Experimental Investigation, *IEEE Transactions on Industrial Electronics, pp.429 - 435, Feb. 2011*, 2011.02. |

111. |
Seiya Abe, Mariko Ogawa, Toshiyuki Zaitsu, Satoshi Obata, Masahito Shoyama, Tamotsu Ninomiya, Investigation of Parameter Tolerance on Digitally Controlled DC-DC Converter with Pole-Zero-Cancellation Technique, *IEEE APCCAS 2010, pp.476-479, Dec. 2010*, 2010.12. |

112. |
Sihun Yang, Seiya Abe, Masahito Shoyama, Design of Low-Profile LLC Resonant Converter for Low Transformer Loss, *IEEE TENCON 2010, No.T1-18.4, pp.1301-1306, Nov. 2010*, 2010.11. |

113. |
Seiya Abe, Sihun Yang, Mariko Ogawa, Masahito Shoyama, Tamotsu Ninomiya, Akira Matsumoto, Akiyoshi Fukui, Mikio Yamasaki, Malfunction Suppression of Semiconductor Circuit Breaker in High Voltage DC Power Supply System, *IEEE TENCON 2010, No.T1-17.3, pp.1278-1283, Nov. 2010*, 2010.11. |

114. |
Emad M. Ahmed, Masahito Shoyama, Modified Adaptive Variable Step-Size MPPT Based-on Single Current Sensor, *IEEE TENCON 2010, No.T1-8.2, pp.1235-1240, Nov. 2010*, 2010.11. |

115. |
Seiya Abe, Mariko Ogawa, Toshiyuki Zaitsu, Satoshi Obata, Masahito Shoyama, Tamotsu Ninomiya, Dynamic Characteristics of Digitally Controled Conveter with Pole-Zero-Cancellation Techique, *IEEE TENCON 2010, No.T1-2.3, pp.25-30, Nov. 2010*, 2010.11. |

116. |
Emad M. Ahmed, Masahito Shoyama, Highly Efficient Variable-Step-Size Maximum Power Point Tracker for PV Systems, *IEEE ISEEE 2010, pp.112-117, Sep. 2010*, 2010.09. |

117. |
Seiya Abe, Kentaro Fukushima, Sihun Yang, Mariko Ogawa, Kosuke Nomura, Masahito Shoyama, Tamotsu Ninomiya, Akira Matsumoto, Akiyoshi Fukui, Mikio Yamasaki, Malfunction Mechanism of Semiconductor Circuit Breaker in HVDC Power Supply System, *IEEE ECCE 2010, pp.3733-3738, Sep. 2010*, 2010.09. |

118. |
Gamal M. Dousoky, Masahito Shoyama, Tamotsu Ninomiya, On Factors Affecting EMI-Performance of Noise-Mitigating Digital Controllers in DC-DC Converters -- An Experimental Investigation, *IEEE ECCE 2010, pp.1239-1245, Sep. 2010*, 2010.09. |

119. |
Sihun Yang, Seiya Abe, Masahito Shoyama, Parametric Analysis of LLC Resonant Converter Using Flat Transformer for Loss Reduction, *EPE-PEMC 2010, pp.T2-(204-209), Sep. 2010*, 2010.09. |

120. |
Seiya Abe, Kentaro Fukushima, Sihun Yang, Mariko Ogawa, Kosuke Nomura, Masahito Shoyama, Tamotsu Ninomiya, Akira Matsumoto, Akiyoshi Fukui, Mikio Yamasaki, Consideration for the Malfunction of Semiconductor Circuit Breaker in High Voltage DC Power Supply System, *EPE-PEMC 2010, pp.T6-(171-175), Sep. 2010*, 2010.09. |

121. |
Gamal M. Dousoky, Masahito Shoyama, Tamotsu Ninomiya, A Comparative Investigation of Several Frequency Modulation Profiles for Programmed Switching Controllers Targeted Conducted-Noise Reduction in DC-DC Converters, *IEICE Trans. on Commun., Vol.E93-B, No.9, pp.2265-2272, Sep. 2010*, 2010.09. |

122. |
E. Firmansyah, S. Tomioka, S. Abe, M. Shoyama, T. Ninomiya, Totem-Pole Power-Factor-Correction Converter under Critical-Conduction-Mode Interleaved Operation, *IEICE Trans. on Commun., Vol.E93-B, No.9, pp.2250-2256, Sep. 2010*, 2010.09. |

123. |
Sihun Yang, Seiya Abe, Masahito Shoyama, Operating Temperature Reduction of Low-Profile Transformer in LLC Resonant Converter for PDP, *IEEE ISIE 2010, Vol.10, No.4, pp.963-968, Jul. 2010*, 2010.07. |

124. |
Gamal M. Dousoky, Masahito Shoyama, Tamotsu Ninomiya, A Double-Hybrid Spread-Spectrum Technique for EMI Mitigation in DC-DC Switching Regulators, *Journal of Power Electronics (JPE), Vol.10, No.4, pp.342-350, Jul. 2010*, 2010.07. |

125. |
Seiya Abe, Kosuke Nomura, Kentaro Fukushima, Masahito Shoyama, Tamotsu Ninomiya, Akira Matsumoto, Akiyoshi Fukui, Mikio Yamasaki, Study on Malfunction Mechanism of Semiconductor Circuit Breaker in 400V DC Power Supply System, *IPEC-Sapporo 2010, pp.2644-2649, Jun. 2010*, 2010.06. |

126. |
Gamal M. Dousoky, Masahito Shoyama, Consideration for Digital Controllers Targeted at Conducted-Noise Spectrum-Spreading in DC-DC Converters, *IPEC-Sapporo 2010, pp.920-926, Jun. 2010*, 2010.06. |

127. |
Sihun Yang, Seiya Abe, Masahito Shoyama, Design Consideration of Flat Transformer in LLC Resonant Converter for Low Core Loss, *IPEC-Sapporo 2010, pp.343-348, Jun. 2010*, 2010.06. |

128. |
Sihun Yang, Seiya Abe, Masahito Shoyama, Design Consideration of Reduction Flat Transformer Temperature in LLC Resonant Converter for Plasma Display, *SPEEDAM 2010, pp.1141-1145, Jun. 2010*, 2010.06. |

129. |
Seiya Abe, Mariko Ogawa, Toshiyuki Zaitsu, Satoshi Obata, Masahito Shoyama, Tamotsu Ninomiya, Power-Stage Frequency Response Cancellation of DC-DC Converter with Digital Control, *SPEEDAM 2010, pp.44-49, Jun. 2010*, 2010.06. |

130. |
Gamal M. Dousoky, Masahito Shoyama, Tamotsu Ninomiya, Conducted-Noise Characteristics of a Digitally-Controlled Randomly-Switched DC-DC Converter with an FPGA-Based Implementation, *Journal of Power Electronics (JPE), Vol.10, No.3, pp.228-234, May. 2010*, 2010.05. |

131. |
Gamal M. Dousoky, Masahito Shoyama, FPGA-Based Digital Implementation of a Hybrid Spread-Spectrum Technique for EMI Mitigation in DC-DC Converters, *PCIM 2010, pp.779-784, May. 2010*, 2010.05. |

132. |
K. Fukushima, I. Norigoe, M. Shoyama, T. Ninomiya, Y. Harada, K. Tsukakoshi, Input current-ripple reduction on Pulse-link DC-AC converter for fuel cell applications operated by zero-current-slope mode, *IEEE ICIT 2010, pp.1201-1205, Mar. 2010*, 2010.03. |

133. |
S. Abe, M. Ogawa, T. Zaitsu, S. Obata, M. Shoyama, T. Ninomiya, Dynamic characteristics improvement of digital controlled DC-DC converter by means of PZC control, *IEEE ICIT 2010, pp.750-755, Mar. 2010*, 2010.03. |

134. |
Gamal M. Dousoky, Masahito Shoyama, Tamotsu Ninomiya, Triple-Hybrid Switching Strategy for Conducted-Noise Level Reduction in DC-DC Converters, *Research Reports on ISEE of Kyushu University, Vol.15, No.1, pp.25-30, Mar. 2010*, 2010.03. |

135. |
E. Firmansyah, S. Tomioka, S. Abe, M. Shoyama, T. Ninomiya, An Interleaved Totem-Pole Power Factor Correction Converter, *Research Reports on ISEE of Kyushu University, Vol.15, No.1, pp.19-24, Mar. 2010*, 2010.03. |

136. |
Kentaro Fukushima, Isami Norigoe, Masahito Shoyama, Tamotsu Ninomiya, Yosuke Harada, Kenta Tsukakoshi, Analysis of Pulse-link DC-AC Converter for Fuel Cells Applications Operated in Zero-Current-Slope Mode, *IEEE APEC 2010, pp.289-294, Feb. 2010*, 2010.02. |

137. |
E. Firmansyah, S. Abe, M. Shoyama, S. Tomioka, An Active-Clamped Full-Wave Zero-Current-Switched Quasi-Resonant Boost Converter in Power Factor Correction Application, *IEEE APEC 2010, pp.30-35, Feb. 2010*, 2010.02. |

138. |
Shinya HIROMITSU, Mariko OGAWA, Seiya ABE, Masahito SHOYAMA, Yu YONEZAWA, Naoyuki MISHIMA, Transient Current Circuit for Switching Loss Reduction in Buck Converters, *INTELEC 2009, PC3-2, pp.1-5, Oct. 2009*, 2009.10. |

139. |
Seiya ABE, Mariko OGAWA, Toshiyuki ZAITSU, Satoshi OBATA, Masahito SHOYAMA, Tamotsu NINOMIYA, Frequency Response Improvement of DSP Controlled DC-DC Converter with Pole-Zero Cancellation Technique, *INTELEC 2009, PC3-3, pp.1-6, Oct. 2009*, 2009.10. |

140. |
Seiya ABE, Kosuke NOMURA, Kentaro FUKUSHIMA, Masahito SHOYAMA, Tamotsu NINOMIYA, Akira MATSUMOTO, Akiyoshi FUKUI, Mikio YAMASAKI, Noise Current Characteristics of Semiconductor Circuit Breaker during Break-Off Condition in DC Power Supply System, *INTELEC 2009, PA1-3, pp.1-5, Oct. 2009*, 2009.10. |

141. |
Kentaro FUKUSHIMA, Isami NORIGOE, Masahito SHOYAMA, Tamotsu. NINOMIYA, Yosuke HARADA, Kenta TSUKAKOSHI, The Effect of Series LC Circuit Parameters on Current-Ripple Reduction in Pulse-Link DC-AC Converter for Fuel Cell Applications, *INTELEC 2009, RE4-1, pp.1-6, Oct. 2009*, 2009.10. |

142. |
EKA Firmansyah, Satoshi TOMIOKA, Seiya ABE, Masahito SHOYAMA, Tamotsu NINOMIYA, A Critical-Conduction-Mode Bridgeless Interleaved Boost Power Factor Correction, *INTELEC 2009, PC16-2, pp.1-5, Oct. 2009*, 2009.10. |

143. |
G. M. Dousoky, M. Shoyama, T. Ninomiya, Double-Hybrid Spread-Spectrum Technique for Conducted-EMI Reduction in DC-DC Switching Regulators with FPGA-Based Controller, *INTELEC 2009, PEC-2, pp.1-6, Oct. 2009*, 2009.10. |

144. |
Sihun Yang, Seiya Abe, Masahito Shoyama, Design of LLC Resonant Converter Using Planar Magnetic Component, *INTELEC 2009, PC14-4, pp.1-5, Oct. 2009*, 2009.10. |

145. |
Seiya ABE, Masahito SHOYAMA, Tamotsu NINOMIYA, Optimal Design of Output Filter Capacitor for Peak Current Mode Control Converter with First-Order Response, *EPE 2009, D.S.3-2, pp. 1-8, Sep. 2009*, 2009.09. |

146. |
G. M. Dousoky, M. Shoyama, T. Ninomiya, Triple-Hybrid Spread-Spectrum Technique for Conducted-Noise Reduction in DC-DC Converters with an FPGA-Based Implementation, *EPE 2009, D.S.1-9, pp. 1-8, Sep. 2009*, 2009.09. |

147. |
EKA Firmansyah, Satoshi TOMIOKA, Seiya ABE, Masahito SHOYAMA, Tamotsu NINOMIYA, A Zero-Current-Switch Quasi-Resonant Boost Converter with Transformer Compensated Clamp Circuit, *EPE 2009, D.S.1-1, pp. 1-8, Sep. 2009*, 2009.09. |

148. |
Kentaro FUKUSHIMA, Isami NORIGOE, Masahito SHOYAMA, Tamotsu. NINOMIYA, Yosuke HARADA, Kenta TSUKAKOSHI, Influence of Small-Series LC circuit on the Input Current-Ripple for Pulse-Link DC-AC Converter for Fuel Cells Applications, *EPE 2009, L.S.1f, pp. 1-8, Sep. 2009*, 2009.09. |

149. |
G. M. Dousoky, M. Shoyama, T. Ninomiya, Studying the Design and Performance of Conducted-Noise Spectrum Spreading in DC-DC Converters with an FPGA-Based Controller, *2009 International Symposium on Electromagnetic Compatibility, EMC’09/Kyoto*, 2009.07. |

150. |
S. Abe, M. Hirokawa, M. Shoyama, T. Ninomiya, Optimal Design Considerations of a Bus Converter for On-Board Distributed Power Systems, *Journal of Power Electronics (JPE)*, Vol.9, No.3, pp.447-455, 2009.05. |

151. |
E. Firmansyah, S. Tomioka, S. Abe, M. Shoyama, T. Ninomiya, Steady State Characteristics of Active-Clamped Full-Wave Zero-Current-Switched Quasi-Resonant Boost Converters, *IEEE 6th IPEMC 2009-ECCE Asia*, pp. 556-560, 2009.05. |

152. |
G. M. Dousoky, M. Shoyama, T. Ninomiya, FPGA-Based Techniques for Conducted-Noise Mitigation in DC-DC Power Converters, *2009 Korea-Japan Joint Conference on AP/EMC/EMT, KJJC’09*, 2009.05. |

153. |
E. Firmansyah, S. Tomioka, S. Abe, M. Shoyama, T. Ninomiya, Zero Current Switch-Quasi Resonant Boost Converter Performance in Power Factor Correction Application, *IEEE APEC 2009*, pp. 1165-1169, 2009.02. |

154. |
K. Fukushima, I. Norigoe, M. Shoyama, T. Ninomiya, Y. Harada, K. Tsukakoshi, Input Current-Ripple Consideration for the Pulse-Link DC-AC Converter for Fuel Cells by Small Series LC Circuit, *IEEE APEC 2009*, pp. 447-451, 2009.02. |

155. |
G. M. Dousoky, M. Shoyama, T. Ninomiya, A Novel Implementation of an FPGA-Based Controller for Conducted-Noise Reduction in Randomly Switched DC-DC Converters, *IEEE APEC 2009*, pp. 65-69, 2009.02. |

156. |
G. M. Dousoky, M. Shoyama, T. Ninomiya, FPGA-Based Design and Implementation of Spread-Spectrum Schemes for Conducted-Noise Reduction in DC-DC Converters, *ICIT 2009*, AF-011282, 2009.02. |

157. |
Characteristics of a Pulse-Link DC-AC Converter for Fuel Cells. |

158. |
K. Fukushima, T. Ninomiya, M. Shoyama, I. Norigoe, Y. Harada, K. Tsukakoshi, Input Current-Ripple Reduction of a Pulse-link DC-AC Converter for Fuel Cells, *INTELEC 2008*, No. 29-3, 2008.09. |

159. |
K. Fukushima, T. Ninomiya, M. Shoyama, I. Norigoe, Y. Harada, K. Tsukakoshi, Consideration for Input Current-Ripple of Pulse-link DC-AC Converter for Fuel Cells, *EPE-PEMC 2008*, pp. 148-153, 2008.09. |

160. |
S. Abe, M. Hirokawa, M. Shoyama, T. Ninomiya, Optimal Bus Capacitance Design for System Stability in On-Board Distributed Power Architecture, *EPE-PEMC 2008*, pp. 401-407, 2008.09. |

161. |
K. Fukushima, T. Ninomiya, M. Shoyama, I. Norigoe, Y. Harada, K. Tsukakoshi, Consideration for Input Current-Ripple Reduction on a Novel Pulse-link DC-AC Converter for Fuel Cells, *PESC 2008*, pp. 1284-1289, 2008.06. |

162. |
S. Abe, M. Hirokawa, M. Shoyama, T. Ninomiya, Optimal Intermediate Bus Capacitance for System Stability on Distributed Power, *PESC 2008*, pp. 611-616, 2008.06. |

163. |
K. Fukushima, I. Norigoe, T. Ninomiya, M. Shoyama, Y. Harada, K. Tsukakoshi, Input Current-Ripple Reduction Method on a Novel Pulse-link DC-AC Converter for Fuel Cells Applications, *SPEEDAM 2008*, pp. 821-825, 2008.06. |

164. |
S. Abe, M. Shoyama, T. Ninomiya, First-Order Transient Response of DC-DC Converter with Peak Current Mode Control for Low-Voltage Application, *SPEEDAM 2008*, pp. 32-36, 2008.06. |

165. |
K. Fukushima, T. Ninomiya, M. Shoyama, I. Norigoe, Y. Harada, K. Tsukakoshi, Z. Dai, Consideration for the Pulse-link DC-AC Converter for Fuel Cells, *IEEE APEC 2008*, pp. 298-303, 2008.02. |

166. |
M. Shoyama, and T. Ninomiya, Common-mode Noise Reduction in the Watkins-Johnson Converter, *7th International Conference on Power Electronics (ICPE’07)*, pp.1,083-1,086, 2007.10. |

167. |
M. Shoyama, Y. Kurokawa, and T. Ninomiya, Common-mode Noise Reduction in the Watkins-Johnson Converter, *IEEE 29th INTELEC’07*, pp.577-580, 2007.09. |

168. |
M. Shoyama, and T. Ninomiya, Output Voltage Control of Resonant Boost Switched Capacitor Converter, *The Fourth Power Conversion Conference (PCC-NAGOYA 2007)*, No.LS3-4-4, pp.899-903, 2007.04. |

169. |
M. Shoyama, and T. Ninomiya, Common-Mode Noise Reduction Techniques Using Current Cancellation in Switching Power Supplies, *2006 Korea-Japan Joint Conference on AP/EMCJ/EMT (KJCC 2006)*, pp.197-200, 2006.09. |

170. |
M. Shoyama, F. Deriha, and T. Ninomiya, Evaluation of Conducted Noise of Resonant Switched Capacitor Converter, *IEEE International Telecommunications Energy Conference*, No.14-3, pp.205-209, 2006.09. |

171. |
M. Shoyama, and T. Ninomiya, Common-Mode Noise Reduction by Current Cancellation in Switching Power Supplies, *The 7th International Joint Symposium between Chungnam National University and Kyushu University（第７回忠南大学・九州大学間国際合同シンポジウム）*, pp.67-70, 2005.09. |

172. |
M. Shoyama, F. Deriha, and T. Ninomiya, Steady-State Characteristics of Resonant Switched Capacitor Converter, *Journal of Power Electronics (JPE)*, Vol.5, No.3, pp.206-211, 2005.07. |

173. |
M. Shoyama, F. Deriha, and T. Ninomiya, Operation Analysis and Control of Resonant Boost Switched Capacitor Converter with High Efficiency, *IEEE 36th Power Electronics Specialists Conference (PESC '05) Record*, 10.1109/PESC.2005.1581901, 1966-1971, pp.1966-1971, 2005.06. |

174. |
M. Shoyama, T. Tsumura, and T. Ninomiya, Optimum Design Considerations of Balanced Boost Switching Converter to Reduce Common-Mode Conducted Noise, *2005 International Power Electronics Conference (IPEC '05)*, pp.1150-1154, 2005.04. |

175. |
M. Shoyama, F. Deriha, and T. Ninomiya, Operation Analysis of Resonant Switched Capacitor Converter, *2005 International Power Electronics Conference (IPEC '05)*, pp.508-512, 2005.04. |

176. |
M. Shoyama, F. Deriha, and T. Ninomiya, Resonant Boost Switched Capacitor Converter with High Efficiency, *IEEE International Conf. on Industrial Electronics, Control and Instrumentation (IECON '04)*, 222-226, No.WC7-2, 2004.11. |

177. |
M. Shoyama, F. Deriha, and T. Ninomiya, Steady-State Characteristics of Resonant Switched Capacitor Converter, *6th International Conference on Power Electronics (ICPE '04)*, pp.II-137-141, 2004.10. |

178. |
M. Shoyama, M. Ohba, and T. Ninomiya, Common-Mode Noise Reduction by Current Cancellation in Balanced Buck-Boost Switching Converter, *4th International Power Electronics and Motion Control Conference (IPEMC '04)*, 1505-1510, pp.1505-1510, 2004.08. |

179. |
M. Shoyama, T. Naka, and T. Ninomiya, Resonant Switched Capacitor Converter with High Efficiency, *IEEE 35th Power Electronics Specialists Conference (PESC '04) Record*, 3780-3786, pp.3780-3786, 2004.06. |

180. |
M. Shoyama, T. Tsumura, and T. Ninomiya, Mechanism of Common-Mode Noise Reduction in Balanced Boost Switching Converter, *IEEE 35th Power Electronics Specialists Conference (PESC '04) Record*, 1115-1120, pp.1115-1120, 2004.06. |

181. |
T. Ninomiya, M. Shoyama, N. Mutoh, and H. Hayakawa, Common-Mode Noise Reduction Techniques for Switched-Mode Power Converters, *2004 International Symposium on Electromagnetic Compatibility*, pp.193-196, 2004.06. |

182. |
M. Shoyama, T. Tsumura, G. Li, and T. Ninomiya, Analysis of Noise Current Cancellation Mechanism in Balanced Boost Switching Converter, *2004 International Symposium on Electromagnetic Compatibility*, pp.725-728, 2004.06. |

183. |
M. Shoyama, G. Li, and T. Ninomiya, Balanced Switching Converter to Reduce Common-Mode Conducted Noise, *IEEE Transactions on Industrial Electronics*, 10.1109/TIE.2003.819677, 50, 6, 1095-1099, Vol.50, No.6, pp.1095-1099, 2003.12. |

184. |
G. Li, M. Shoyama, and T. Ninomiya, Noise Reduction Mechanism in Common-Source Type Active-Clamped DC-DC Converters, *IEEE International Telecommunications Energy Conference, 03CH37481*, 505-509, pp.505-509, 2003.10. |

185. |
M. Shoyama, M. Ohba, and T. Ninomiya, Common-Mode Noise Reduction by Current Cancellation in Balanced Buck-Boost Switching Converter, *IEEE International Telecommunications Energy Conference, 03CH37481*, 499-504, pp.499-504, 2003.10. |

186. |
M. Shoyama, T. Tsumura, and T. Ninomiya, Common-Mode Noise Reduction by Current Cancellation in Balanced Boost Switching Converter, *2003 Korea-Japan Joint Symposium on Advanced Industry Applications*, pp.18-22, 2003.10. |

187. |
M. Shoyama, G. Li, and T. Ninomiya, Application of Common-Source Active-Clamp Circuit to Various DC-DC Converter Topologies, *IEEE Power Electronics Specialists Conference Record, 03CH37427*, 1321-1326, pp.1321-1326, 2003.06. |

188. |
M. Shoyama, M. Ohba, and T. Ninomiya, Balanced Buck-Boost Switching Converter to Reduce Common-Mode Conducted Noise, *IEEE Power Electronics Specialists Conference Record, 02CH37289*, 2056-2061, pp.2056-2061, 2002.06. |

189. |
M. Shoyama, M. Ohba, and T. Ninomiya, Balanced Buck-Boost Switching Converter to Reduce Common-Mode Conducted Noise, *Journal of Power Electronics (JPE)*, Vol.2, No.2, pp.139-145, 2002.04. |

190. |
M. Shoyama, M. Ohba, and T. Ninomiya, Balanced Buck-Boost Switching Converter to Reduce Common-Mode Conducted Noise, *2001 International Conf. on Power Electronics (ICPE)*, pp.212-216, 2001.10. |

191. |
T. Ninomiya, M. Shoyama, C.F. Jin, and G. Li, EMI Issues in Switching Power Converters, *13th International Symposium on Power Semiconductor Devices & ICs (ISPSD)*, 81-85, pp.81-85, 2001.06. |

192. |
G. Li, M. Shoyama, T. Ninomiya, and T. Inoue, Common-Mode Noise Reduction in DC-DC Converters by Common-Source Type Active-Clamp Technique, *IEEE Power Electronics Specialists Conference Record, 01CH37230*, 1773-1778, pp.1773-1778, 2001.06. |

193. |
M. Shoyama, T. Okunaga, G. Li, and T. Ninomiya, Balanced Switching Converter to Reduce Common-Mode Conducted Noise, *IEEE Power Electronics Specialists Conference Record, 01CH37230*, 451-456, pp.451-456, 2001.06. |