2021/08/17 更新

写真a

イシハラ マサタカ
石原 將貴
Ishihara Masataka
所属
自然科学学域 助教
職名
助教
外部リンク

学位

  • 博士(工学) ( 2021年3月   岡山大学 )

  • 修士(工学) ( 2017年3月   島根大学 )

 

論文

  • Strategy of Topology Selection Based on Quasi-Duality Between Series–Series and Series–Parallel Topologies of Resonant Inductive Coupling Wireless Power Transfer Systems

    Masataka Ishihara, Kazuhiro Umetani, Eiji Hiraki

    IEEE Transactions on Power Electronics   35 ( 7 )   6785 - 6798   2020年7月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers ({IEEE})  

    DOI: 10.1109/TPEL.2019.2956732

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  • Optimization of Common Source Inductance and Gate-Drain Capacitance for Reducing Gate Voltage Fluctuation after Turn-off Transition

    Yusuke Hatakenaka, Kazuhiro Umetani, Masataka Ishihara, Eiji Hiraki

    2020 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   3155 - 3162   2020年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Next-generation switching devices as GaN-FETs are recently emerging as promising switching devices capable of extremely high-speed switching. High-speed switching enables the high-frequency operation of the power converters, which can reduce the size of the passive components. However, highspeed switching can induce the resonance between the parasitic capacitance of the switching device and the parasitic inductance of the circuit board wiring, which appears as the gate voltage fluctuation at the switching. Particularly, GaN-FETs tend to have comparatively low gate threshold voltage and therefore are susceptible to the false turn-on, which is caused by the gate voltage fluctuation in the switching device just after the turn-off transition. For preventing this phenomenon, this paper analytically investigates the design requirement of these parasitic parameters to reduce the gate voltage fluctuation after the turn-off transition. As a result, the optimal ratio of the gate-drain capacitance and the common source inductance is elucidated to be the key to minimize the gate voltage fluctuation. The simulation and the experiment supported that the optimal design of this ratio can reduce the gate voltage fluctuation, supporting the usefulness of this novel insight for preventing the false turn-on.

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  • Multiple-Transmitter Achieving Load-Independent Transmitter Current and Compensation of Cross-Interference Among Transmitters for Wide Charging Area Wireless Power Transfer Systems

    Kodai Matsuura, Masataka Ishihara, Akihiro Konishi, Kazuhiro Umetani, Eiji Hiraki

    2020 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   5474 - 5481   2020年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Recently, a resonant inductive coupling wireless power transfer (RIC-WPT) system with multiple transmitters is emerging as a promising power supply method for household appliances, mobile devices, and wearable devices dispersedly placed in a wide area. However, the multiple-transmitter often suffers from an unstable operation of an inverter, feeding AC current to the transmitter coil, due to the cross-interference (i.e., cross-coupling) among the transmitters. When the cross-interference occurs, the inverter may not achieve high power factor and soft switching, which damages the power density and reliability of the multiple-transmitter. Therefore, this paper proposes a multiple-transmitter, including its controller, that can compensate for the effect of the cross-interference. In the proposed multiple-transmitter, each transmitter has a simple switching circuit that can automatically cancel the induced voltage due to the cross-interference with only simple control. Furthermore, the proposed multiple-transmitter also achieves a load-independent transmitter current by the control of the input voltage of the inverter, which results in a stable magnetic field regardless of load variation. Experiments verify the effectiveness and appropriateness of the proposed multiple-transmitter.

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

    Kazuhiro Umetani, Toru Honjo, Takahiro Koyama, Masataka Ishihara, Eiji Hiraki

    IET POWER ELECTRONICS   12 ( 9 )   2338 - 2344   2019年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:INST ENGINEERING TECHNOLOGY-IET  

    Resonant inductive coupling wireless power transfer is widely known to be a possible convenient power supply method for the small mobile apparatus. However, the limited receiving-coil size tends to lower the efficiency and limit the output power owing to the small mutual inductance and comparatively large stray alternating current (AC) resistance of the receiving-coil. This study mitigates this issue by proposing a novel receiving-coil structure. This proposed structure comprises a coil and a drum core with a thin axis. The coil is wound on the axis to form a single winding layer. The proposed structure can reduce stray AC resistance by suppressing the proximity effect and reducing the wire length without deteriorating the mutual inductance significantly. Therefore, better efficiency and larger output power can be achieved. Simulations and experiments were performed to verify the proposed structure. Consequently, both simulations and experiments supported the reduction in AC resistance compared to the conventional structure. Furthermore, the experiment revealed improvements by the proposed structure in both efficiency and output power. These results support the effectiveness of the proposed structure for wireless power transfer to small mobile apparatus.

    DOI: 10.1049/iet-pel.2018.5358

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  • Automatic Active Compensation Method of Cross-Coupling in Multiple-receiver Resonant Inductive Coupling Wireless Power Transfer Systems

    Masataka Ishihara, Keita Fujiki, Kazuhiro Umetani, Eiji Hiraki

    2019 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   4584 - 4591   2019年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    The ability to charge to multiple receivers simultaneously with a single transmitter is one of the advantages of resonant inductive coupling wireless power transfer (RICWPT) technologies. However, in multiple-receiver RIC-WPT systems, each receiver often suffers from the magnetic coupling among receivers, i.e., cross-coupling. The cross-coupling not only complicates the control of the receivers but also significantly decreases the output power of each receiver. Hence, the purpose of this paper is to propose a compensation method of the influence due to the cross-coupling. To achieve this purpose, we first analyze the requirement to compensate for the influence of the cross-coupling. As a result, we reveal that it is necessary to control the phase of the current in all the receiver to be orthogonal to the phase of the transmitter current. Then, we propose the method to adjust the current phase of each receiver automatically to the desired phase by using only the phase information of the transmitter current, which results in the full compensation of the influence due to the cross-coupling. Furthermore, the proposed method also compensates for the influence of a detuning of the resonant frequency of each receiver due to the natural tolerance. Experiments of a two-receiver RIC-WPT system successfully verify the effectiveness of the proposed method.

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  • Experimental Verification of Impedance Matching Method for Repeater to Improve Spatial Freedom of 6.78 MHz Resonant Inductive Coupling Wireless Power Transfer Systems

    Keita Fujiki, Masataka Ishihara, Kazuhiro Umetani, Eiji Hiraki

    2019 21ST EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE '19 ECCE EUROPE)   2019年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Placing a repeater, which relays the magnetic field from the transmitter to the receiver, is promising as a method to increase the spatial freedom of resonant inductive coupling wireless power transfer systems (RTC-WPT) working at 6.78MHz. However, the capability of the repeater is often affected by a frequency splitting phenomenon. When this phenomenon occurs, the resonance in the repeater becomes sufficiently small at a fixed operating frequency and make it difficult to improve the spatial freedom. To solve this problem, we apply an impedance matching method using simple switching circuits to the 6.78 RTC-WPT system with the repeater. Then we carry out experiments to verify the effectiveness of the impedance matching method. The experimental results show that the repeater improves the spatial freedom of the 6.78 MHz RTC-WPT regardless of the frequency splitting phenomenon.

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

    Masataka Ishihara, Kazuhiro Umetani, Eiji Hiraki

    2018 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-NIIGATA 2018 -ECCE ASIA)   1610 - 1616   2018年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Intermediate resonator (repeater) in resonant inductive coupling wireless power transfer (RIC-WPT) systems can increase the transmission distance between the transmitting and receiving coils. The induced current in the repeater is easily affected by the frequency splitting phenomenon because the quality factor (Q-factor) of the repeater is generally as high as several hundreds. If this phenomenon occurs, induction of large current is often difficult in the repeater because the one peak characteristic of the induced current is no longer expected and the single peak of resonance splits into multiple peaks which shift the resonant frequency corresponding to the circuit parameters. In this paper, we approach this difficulty by applying an auxiliary circuit to the RIC-WPT system with the repeater. As a result, under the fixed operating frequency, the induced current in the repeater can be kept large even if the frequency splitting phenomenon occurs. The effectiveness of proposed system was supported by the simulation and experiment.

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

    Masataka Ishihara, Kazuhiro Umetani, Eiji Hiraki

    2018 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   6194 - 6201   2018年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Intermediate resonators (repeaters) of resonant inductive coupling wireless power transfer systems can improve the transmission distance as well as the output power. However, frequency bandwidths in which the repeater can operate effectively are very narrow because the repeater usually has a high quality-factor. Furthermore, these frequency bandwidths shift for the following two factors. The first factor is the intensity of the magnetic coupling between the repeater and the other resonator. The second factor is the variation in the natural resonance frequency of the resonators due to a production error, temperature characteristic, and aging degradation. Therefore, the repeater is not practical because the repeater requires accurate adjusting of the circuit parameters every time according to the various conditions. To address this problem, we propose an impedance matching method for the repeater. The proposed method can maximize the induced current in the repeater in wide frequency bandwidth regardless of the variations in the intensity of the magnetic coupling and the natural resonance frequency. Therefore, the proposed method can realize the repeater which can stably improve the performance of the wireless power transfer. Experiment and simulation successfully verified the effectiveness of the proposed method as well as the appropriateness of the theoretical analysis.

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  • Magnetic Structure of Close-Coupled Inductors to Improve the Thermal Handling Capability in Interleaved DC-DC Converter

    Thai Hoang Chuong, Shota Kimura, Daigoro Ebisumoto, Mostafa Noah, Masataka Ishihara, Masayoshi Yamamoto, Jun Imaoka, Wilmar Martinez

    2017 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   205 - 210   2017年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Interleaved DC-DC converter employing close-coupled inductors is a popular topology among other power converters topologies. Close-coupled inductors allow the power converter to achieve high power density and high efficiency. This paper proposes a novel magnetic structure of close-coupled inductors suitable for increasing the thermal handling capability. The proposed magnetic structure is combined of different magnetic materials, namely, ferrite and powder cores. The design method of the integrated close-coupled inductors are presented. Furthermore, this design method is considering the DC bias superposition characteristics, and the iron and copper losses as well. A 300W prototype is built to validate the proposed analysis. Finally, excellent heat dissipation of the proposed magnetic structure of the integrated close-coupled inductors is also reported.

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  • Elucidation of Quasi-Duality between Series-Series and Series-Parallel Topologies of Resonant Inductive Coupling Wireless Power Transfer Systems

    Masataka Ishihara, Kazuhiro Umetani, Eiji Hiraki

    2017 IEEE 12TH INTERNATIONAL CONFERENCE ON POWER ELECTRONICS AND DRIVE SYSTEMS (PEDS)   674 - 679   2017年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Series-Series (SS) and Series-Parallel (SP) topologies are widely utilized in practical resonant inductive coupling wireless power transfer (RIC-WPT) systems owing to their simple circuit configurations. Conventionally, design optimization of the circuit parameters of these topologies were investigated separately, because these topologies are expressed by different equivalent circuits. However, analysis of these equivalent circuits is generally complicated due to the multiple resonant modes contained in the operation, which may cause difficulty in comparing the performance between the SS and SP topologies after design optimization of these topologies. This difficulty may prevent elucidating the methodology to select an appropriate topology that offers better output power or efficiency after design optimization. The purpose of this paper is to suggest a selection methodology of the SS and SP topologies by elucidating a novel insight that these topologies have the quasi-duality relation, in which the SP topology works approximately as the dual of the SS topology. This insight enables to share the analysis results between the topologies. As a result, both of these topologies were found to be expressed by a same novel equivalent circuit. Furthermore, the only difference between the SS and SP topologies were found to be the equivalent load resistance of this equivalent circuit, thus reducing the topology selection into selection of preferable load resistance. The appropriateness of the quasi-duality relation and the resultant equivalent circuit was successfully confirmed by the simulation and the experiment.

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  • Simple Self-Driven Synchronous Rectifier for Resonant Inductive Coupling Wireless Power Transfer

    Takahiro Koyama, Toru Honjo, Masataka Ishihara, Kazuhiro Umetani, Eiji Hiraki

    2017 IEEE INTERNATIONAL TELECOMMUNICATIONS ENERGY CONFERENCE (INTELEC)   363 - 368   2017年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Resonant inductive coupling wireless power transfer (RIC-WPT) is attracting attention as a convenient power supply method to small mobile apparatus. The efficiency and the power transfer capability of RIC-WPT has been known to be profoundly dependent on the quality factor of the receiving resonator. However, the quality factor of the receiving resonator tends to be deteriorated because of the conduction loss at the diode rectifier, particularly for low output voltage applications. In order to improve the efficiency and the power transfer capability, this paper propose a novel simple synchronous rectifier, which can reduce the conduction loss. The proposed rectifier has simple circuit configuration, which contributes to straightforward application to the wireless power transfer to small mobile apparatus with limited installation space. Experiment was carried out to verify the operation principle of the proposed rectifier. As a result, the proposed rectifier revealed successful suppression of the conduction loss. In addition, the experimental wireless power transfer system verified successful improvement in the rectification efficiency, supporting usefulness of the proposed rectifier for practical applications of the RIC-WPT for small mobile apparatus.

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  • Analytical Investigation of Interleaved DC-DC Converter using Closed-Coupled Inductor with Phase Drive Control

    Daigoro Ebisumoto, Shota Kimura, Kimihiro Nanamori, Mostafa Noah, Masataka Ishihara, Jun Imaoka, Masayoshi Yamamoto

    2017 IEEE INTERNATIONAL TELECOMMUNICATIONS ENERGY CONFERENCE (INTELEC)   526 - 529   2017年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Interleaved techniques and magnetic integration in a boost converter have gained attention in electric powertrains system for electric, hybrid and fuel cell vehicles in order to achieve high power density or to improve power conversion efficiency. Furthermore, the proposed multi-phase boost converter is equipped with a phase drive control to improve the efficiency at all load ranges. Furthermore, a design method of a coupled-inductor for an interleaved boost converter with phase drive control is also proposed. However, the interleaved DC-DC converter using coupled method with phase drive control has many problems. In this paper, this problem of interleaved DCDC converter using coupled inductor with phase drive control (PDC) is analyzed. In addition, defensive method of this method.

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  • Design of a Four-Phase Interleaved Boost Circuit with Closed-Coupled Inductors

    Daigoro Ebisumoto, Masataka Ishihara, Shota Kimura, Wilmar Martinez, Mostafa Noah, Masayoshi Yamamoto, Jun Imaoka

    2016 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   2016年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    In this paper, a novel magnetic structure suitable for boost converters is proposed. Multi-phase interleaved method using coupled-inductor has gained attention in electric powertrains for electric, hybrid and fuel cell vehicles in order to achieve high power density. In fact, a four-phase boost converter using coupled inductor is used in the drive system of the Honda CLARITY. In particular, magnetic coupling method is used in coupled inductors, Loosely-Coupled Inductors (LCI) and Closed-Coupled Inductors (CCI). This study is focused on these methods, especially using the CCI. This paper presents a design method of a closed-coupled inductors using generic cores for a four-phase interleaved boost converter. In addition a comparison between the proposed topology with other conventional non-coupled methods is carried out. Furthermore, the evaluation of miniaturization is studied. As a result, the proposed method can achieve a huge reduction in the core volume and mass.

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  • Basic Experiment Study on Misalignment Characteristic of Electrical Resonance Coupling Wireless Power Transfer

    Hirokatsu Umegami, Masataka Ishihara, Fumiya Hattori, Mitsuru Masuda, Masayoshi Yamamoto

    2015 IEEE INTERNATIONAL TELECOMMUNICATIONS ENERGY CONFERENCE (INTELEC)   2015年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    This paper describes lateral misalignment characteristics of electrical resonance coupling wireless power transfer (ERC-WPT) from experimental points of view. A dead zone is an important factor for ERC-WPT because ERC-WPT cannot transfer electric power in the zone. Electrical coupling units that are composed of 2 electrodes lined up laterally have a dead zone. The dead zone exists near outer edge areas of the electrodes and certain distant areas.

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  • Analysis and Design of Passive Components for Interleaved Flyback Converter with Integrated Transformer

    Masataka Ishihara, Shota Kimura, Wilmar Martinez, Masayoshi Yamamoto

    2015 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   5902 - 5909   2015年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Flyback switch mode power supplies have been widely used in low-power applications, such as DC/DC converters, solar micro-inverters and LED drivers. However, flyback converters have several problems related to the volume of the output capacitor as well as high output voltage noise; this is produced by the discontinuous output current. Consequently, interleaved operation with parallel connection on the secondary side can reduce the output current ripple compared with the single-phase flyback converter. Nevertheless, besides the output capacitor, the interleaved operation is unsuitable for transformers if it is desired to obtain light weight and compact performance. To address this problem, the interleaved flyback converter with integrated transformer has been proposed for achieving miniaturization of the output capacitor and transformers. There are mainly two types of the proposed flyback converter with integrated transformer: Parallel and Series types. These two types are categorized based on the connection on the primary side. Nevertheless, quantitative comparison of the volume and power loss has not been analyzed yet. Moreover, the design method of the integrated transformer also has not been conducted with clarity. Hence, in this paper, in order to provide a guide for the design of an interleaved flyback converter for achieving high power density, we analyze the quantitative volume and power losses of the integrated transformer and the input capacitor. Finally, this paper shows some experimental results that validate the appropriateness of the design method for the integrated transformer.

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  • Interleaved Active Clump Forward Converter with Novel Integrated Magnetic Components

    Shota Kimura, Shogo Aoto, Masataka Ishihara, Jun Imaoka, Masayoshi Yamamoto

    2015 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   6029 - 6036   2015年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    This paper proposes Series Input Parallel Output (SIPO) interleaved Active Clump Forward (ACF) converter with novel integrated magnetic components that may achieve high power density. The proposed converter consists of two ACF converters in SIPO connection to share the input voltage and output current. The natural magnetizing reset can be realized by the active clump circuit. The SIPO connection distributes the voltage stress of the primary side switches and the thermal stress of the output rectifiers and filters. The interleaved PWM operation also diminishes the current ripple in the output capacitor to reduce the size the output filter. In addition, the integrated magnetic components are used for inductors and transformers in the proposed converter to realize size-reduction of the magnetic components. Therefore, this converter is suitable for high input voltage and high output current applications such as dc-dc converters EVs and HEVs. In this paper, the operation principle and the theoretical analysis for the proposed integrated magnetic components are presented. Following we use core models for the integrated magnetic components, and the superiority of them in term of reducing the size and losses in the magnetic components is demonstrated clearly through comparison with a conventional single ACF converter and an conventional SIPO interleaved ACF converter. As a result, it is cleared that the proposed converter is effective for size-reduction and low-losses of the magnetic components under the same conditions. To verify the theoretical results, the experiments using a 500 W output prototype are conducted.

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  • Mid-range kHz Electric Resonance Coupling Wireless Power Tranfser

    Hirokatsu Umegami, Masataka Ishihara, Fumiya Hattori, Mitsuru Masuda, Masayoshi Yamamoto, Kazuhiro Umetani

    2015 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   3197 - 3202   2015年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    This paper describes mid-range electrical resonance wireless power transfer in kHz range. Wireless power transfer using electrical field is minor since this method is understood only for close-range applications. However, our experimental units, the resonance frequency of which is 85 kHz, achieved 180 mm distance power transmission by vector network analyzer (VNA) measurement while keeping peak efficiency 68 %. In case of frequency response analyzer (FRA) measurement, the units can transfer power the most to the load at 300 mm but the efficiency is low. The closer the distance between the units, the better the efficiency is.

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  • A Capacitor-less Gate Drive Circuit Using Two Parasitic Capacitors Suitable for Non-Insulating-Gate GaN FETs

    Masataka Ishihara, Fumiya Hattori, Hirokatsu Umegami, Masayoshi Yamamoto

    2014 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)   3212 - 3218   2014年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    New semiconductor devices such as Silicon Carbide (SiC) and Gallium Nitride (GaN) are very attractive for improving converter efficiency and power density in power electronics. Especially, GaN FETs are promising devices for the high speed switching and good cost performance due to being able to use silicon wafer, so that we focus on GaN FETs. There are two types of GaN FETs, and one, non-isolated GaN FETs, has a diode structure on the gate-to-source, and another, isolated GAN FETs, doesn't have this feature. Non-isolated GaN FETs show better performance than isolated GaN FETs in terms of withstand voltage, allowable current, and other parameters. However, simple gate circuits used for MOS FET cannot be applied. Hence, many gate drive circuits for non-isolated GaN FETs are proposed. In this paper, we proposed a novel gate drive circuit for a non-isolated GaN FET, which uses two parasitic capacitors of the switches in the gate drive circuit. The experiment for the proposed gate drive circuit is executed with a simple test circuit. Furthermore, drive loss is analyzed and compared with a previous proposed gate drive circuits. Furthermore, we develop the theoretical equations for the gate drive loss and verify them experimentally. The drive and reverse conduction losses of the proposed capacitor-less gate drive circuit are compared with dividing capacitor gate drive circuit and previous capacitor-less gate drive circuits.

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担当授業科目

  • 表現技法1 (2021年度) 前期  - その他

  • 表現技法2 (2021年度) 後期  - その他

  • 電子情報システム工学特別研究 (2021年度) 通年  - その他

  • 電気通信系実験A (2021年度) 1・2学期  - 水2,水3,水4,水5,水6

  • 電気通信系実験C (2021年度) 3・4学期  - 火3,火4,火5,火6,火7