Masatoshi Uno

Masatoshi Uno

Ibaraki University

H-index: 30

Asia-Japan

About Masatoshi Uno

Masatoshi Uno, With an exceptional h-index of 30 and a recent h-index of 24 (since 2020), a distinguished researcher at Ibaraki University, specializes in the field of Power Electronics.

His recent articles reflect a diverse array of research interests and contributions to the field:

受動電流バランスとインダクタ電流のリプル低減が可能なインタリーブ昇降圧コンバータ

EV 搭載バッテリの台形波交流加熱を実現する 3 レベルフライングキャパシタインバータ

Interleaved Buck-Boost Converter with Passive Current Balancing and Inductor Current Ripple Reduction

ZVS Resonant Switched Capacitor Converter with 1.5 X Fixed Step-Up Ratio for EV Batteries

Evaluation of Power Generation of Photovoltaic Panel on EVs with Cell-and Substring-Level Differential Power Processing Converters Using 3D Model

DAB Converter Integrating Trapezoidal-Wave Internal Heating Inverter for Automotive Lithium-Ion Batteries at Subzero Temperatures

1.5 倍の固定昇圧比を有する EV 搭載バッテリ用 ZVS 共振形スイッチトキャパシタコンバータ

単一インダクタを有する太陽光発電システム用カスケードマルチポートコンバータの解析

Masatoshi Uno Information

University

Ibaraki University

Position

___

Citations(all)

3466

Citations(since 2020)

2039

Cited By

2266

hIndex(all)

30

hIndex(since 2020)

24

i10Index(all)

69

i10Index(since 2020)

52

Email

University Profile Page

Ibaraki University

Masatoshi Uno Skills & Research Interests

Power Electronics

Top articles of Masatoshi Uno

受動電流バランスとインダクタ電流のリプル低減が可能なインタリーブ昇降圧コンバータ

Authors

荒川祐太, 鵜野将年, 小山翔

Journal

電気学会論文誌 D (産業応用部門誌)

Published Date

2024/2/1

Buck-boost converters with a large current capacity are required for batteries in renewable energy systems. Although interleaved converters are a typical solution to enhance the current capacity, additional components and feedback control loops are required to balance phase currents, resulting in increased circuit complexity and cost. Furthermore, the inductor current ripples of buck-boost converters tend to be larger than those of buck or boost converters. This paper proposes the interleaved buck-boost converter with passive current balancing and inductor current ripple reduction. Flying capacitors are incorporated to not only to balance the capacitive current but also reduce inductor voltage and current ripple. An experimental verification using a 300W prototype demonstrated that the passive current balancing capability and inductor current ripple can be reduced.

EV 搭載バッテリの台形波交流加熱を実現する 3 レベルフライングキャパシタインバータ

Authors

平沼標雅, 鵜野将年, 笹間裕太

Journal

電気学会論文誌 D (産業応用部門誌)

Published Date

2024/5/1

Lithium-ion batteries (LIBs) in electric vehicles at low temperatures must be properly heated to avoid a decrease in their discharge capability. Internal ac heating techniques utilizing Joule heat generated by ac current flowing through an internal resistance of LIB have been proposed as an efficient and fast heating method. However, traditional internal ac heating techniques that use triangular and sinusoidal waves are not ideal due to their relatively low rms value at a given peak current, which results in a long heating time. This paper proposes a 3-level flying capacitor inverter for reducing heating time. The proposed PWM technique generates trapezoidal wave with a high rms value at a given peak current. Experimental results of a prototype for a 12-cell LIB demonstrated that the proposed trapezoidal wave heating reduced heating time to approximately one-third compared with traditional sinusoidal-wave heating.

Interleaved Buck-Boost Converter with Passive Current Balancing and Inductor Current Ripple Reduction

Authors

Yuta Arakawa,Masatoshi Uno,Kakeru Koyama

Journal

IEEJ Transactions on Industry Applications

Published Date

2024/2

Interleaved Buck-Boost Converter with Passive Current Balancing and Inductor Current Ripple Reduction - NASA/ADS Now on home page ads icon ads Enable full ADS view NASA/ADS Interleaved Buck-Boost Converter with Passive Current Balancing and Inductor Current Ripple Reduction Arakawa, Yuta ; Uno, Masatoshi ; Koyama, Kakeru Abstract Publication: IEEJ Transactions on Industry Applications Pub Date: February 2024 DOI: 10.1541/ieejias.144.53 Bibcode: 2024IJTIA.144...53A full text sources Publisher | © The SAO/NASA Astrophysics Data System adshelp[at]cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A NASA logo Smithsonian logo Resources About ADS ADS Help What's New Careers@ADS Social @adsabs ADS Blog Project Switch to full ADS Is ADS down? (or is it just me...) Smithsonian Institution …

ZVS Resonant Switched Capacitor Converter with 1.5 X Fixed Step-Up Ratio for EV Batteries

Authors

Toko Sanada,Masatoshi Uno

Journal

IEEJ Transactions on Industry Applications

Published Date

2023/1

ZVS Resonant Switched Capacitor Converter with 1.5X Fixed Step-Up Ratio for EV Batteries - NASA/ADS Now on home page ads icon ads Enable full ADS view NASA/ADS ZVS Resonant Switched Capacitor Converter with 1.5X Fixed Step-Up Ratio for EV Batteries Sanada, Toko ; Uno, Masatoshi Abstract Publication: IEEJ Transactions on Industry Applications Pub Date: January 2023 DOI: 10.1541/ieejias.143.78 Bibcode: 2023IJTIA.143...78S full text sources Publisher | © The SAO/NASA Astrophysics Data System adshelp[at]cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A NASA logo Smithsonian logo Resources About ADS ADS Help What's New Careers@ADS Social @adsabs ADS Blog Project Switch to full ADS Is ADS down? (or is it just me...) Smithsonian Institution Smithsonian Privacy Notice Smithsonian Terms of Use …

Evaluation of Power Generation of Photovoltaic Panel on EVs with Cell-and Substring-Level Differential Power Processing Converters Using 3D Model

Authors

Benzhou Xin,Ryota Hiraide,Masatoshi Uno

Journal

IEICE Technical Report; IEICE Tech. Rep.

Published Date

2023/1/12

(in English) Photovoltaic panels for electric vehicles receive uneven solar radiation due to the curved roof. It can result in significantly reduced power generation because of variations in panel characteristics among cells and substrings. Differential power processing (DPP) converters have been proposed to address uneven panel characteristics issues. In this paper, simulations with a 3D model of curved panels are performed to evaluate energy generation when DPP converters are introduced in the cells and substrings. Comparing several regions and seasons, the conditions under which DPP converters installation is highly effective are shown. The partially shaded experiment for four cells achieved 10.5% improvement in power generation, demonstrated the effectiveness of DPP converters for panel characteristic variation.

DAB Converter Integrating Trapezoidal-Wave Internal Heating Inverter for Automotive Lithium-Ion Batteries at Subzero Temperatures

Authors

Masatoshi Uno,Yuta Sasama

Journal

IEEE Transactions on Industry Applications

Published Date

2023/7/31

Adequate preheating for electric vehicles’ lithium-ion batteries (LIBs) in cold climates is indispensable to prevent a decrease in cruising distance. Internal ac heating techniques utilizing Joule heat originating from LIBs’ internal resistances have been proposed as an efficient and rapid heating method. However, an additional inverter is necessary to generate ac currents, resulting in increased system complexity. Furthermore, conventional triangular and sinusoidal current waves are not ideal as their rms values at a given peak current are relatively low. This article proposes a dual active bridge (DAB) converter integrating an ac internal heating inverter. A full-bridge circuit is utilized not only for the DAB converter but also for the ac heating inverter, achieving a simplified system. A novel PWM technique is also proposed to generate a trapezoidal current wave that achieves higher rms currents at a given peak current. A …

1.5 倍の固定昇圧比を有する EV 搭載バッテリ用 ZVS 共振形スイッチトキャパシタコンバータ

Authors

眞田東子, 鵜野将年

Journal

電気学会論文誌 D (産業応用部門誌)

Published Date

2023/1/1

As electric vehicle (EV) battery voltages are increasing from 400V to 600-800V, an on-board boost converter with 1.5 X step-up conversion ratio is required to utilize existing 500V chargers. This paper proposes a zero-voltage switching (ZVS) resonant flying switched capacitor converter with 1.5 X fixed step-up conversion ratio. The theoretical model of efficiency and circuit volume reveals that, in comparison with a conventional zero-current switching topology, the proposed ZVS converter achieves higher efficiency and reduced circuit volume by eliminating fixed losses of semiconductor devices. The experimental results of a 1-kW prototype agreed well in terms of efficiency and circuit volume, verifying the theoretical model.

単一インダクタを有する太陽光発電システム用カスケードマルチポートコンバータの解析

Authors

KOKETSU SEKI,MASATOSHI UNO

Journal

電子情報通信学会技術研究報告 (Web)

Published Date

2023

S. Bairabathina and S. Balamurugan,′′ Review on non-isolated multi-input step-up converters for grid-independent hybrid electric vehicles,′′ International Journal of Hydrogen Energy., vol. 45, pp. 21687-21713, Aug. 2020V. Dash and P. Bajpai,′′ Power management control strategy for a stand-alone solar photovoltaic-fuel cell-battery hybrid system,′′ Sustainable Energy Technologies and Assessments., vol. 9, pp. 68-80, Mar. 2015

Photovoltaic System Realizing Reduced Power Rating and Circuit Volume in Combination with Partially Connected Converter and Differential Power Processing Converter

Authors

Keita Sugiura,Joji Yabuki,Masatoshi Uno

Published Date

2023/11/28

In photovoltaic (PV) systems consisting of multiple PV panels connected in series, conventional converters require a large power rating due to handling the power generated by all panels, resulting in increased circuit volume. A PV system in which a converter is partially connected to series-connected panels has been proposed to reduce power rating. However, a partially connected converter triggers the mismatch in panel characteristics, leading to decreased energy yield. This paper proposes a novel PV system in combination with the partially connected converter and a differential power processing (DPP) converter that can unify panel voltage. By utilizing the DPP converter that is gaining attention as a solution to partial shading issues, the proposed system realizes not only eliminating panel voltage imbalance and enhancing energy yield but also a reduction in power rating and circuit volume by the partially …

Selective Module-to-Cell Equalizer with Internal AC Heating Capability for Automotive Lithium-Ion Batteries at Subzero Temperatures

Authors

Masatoshi Uno,Reona Sugaya,Yuta Sasama

Journal

IEEE Journal of Emerging and Selected Topics in Power Electronics

Published Date

2023/6/26

Preheating for automotive lithium-ion batteries (LIBs) is indispensable to enhance cruising distance at subzero temperatures and to improve fast-charging performance. Internal ac heating techniques that utilize Joule heat originating from LIBs’ internal resistances are an efficient heating method. However, an additional inverter is necessary to generate ac currents for LIBs, increasing the system complexity and cost. This article proposes an integrated cell equalizer that operates either in a cell equalization mode or internal ac heating mode. The proposed equalizer is based on a selective module-to-cell equalizer using a dual active bridge (DAB) converter. The DAB converter in the equalization mode exchanges energies between the LIB module and cells. In the ac heating mode, a winding inductance of a transformer resonates to generate ac heating currents for the LIB module. A prototype for a 3400-mAh 12-cell …

EV 用リチウムイオンバッテリ向け交流内部加熱と電力伝送を同時に達成可能な DAB コンバータ

Authors

飛田晃希, 平沼標雅, 鵜野将年

Journal

電気学会研究会資料. MD/モータドライブ研究会 [編]

Published Date

2023

EV ヨウ リチウムイオンバッテリ ムケ コウリュウ ナイブ カネツ ト デンリョク デンソウ オ ドウジ ニ タッセイ カノウ ナ DAB コンバータ

Resonant Switched Capacitor Converter with Conduction Losses Reduction by Generating Trapezoidal wave current for Electric Vehicles

Authors

Ranma Kondo,Masatoshi Uno

Published Date

2023/11/28

EV battery voltages are increasing from the conventional 400 V to 800 V. To fully utilize existing 400 V chargers for such high-voltage batteries, an on-board boost converter with a step-up conversion ratio of 2.0 is required. Resonant switched capacitor converters (RSCCs) are known as the best topology to reduce circuit volume. However, a rms current of the resonant sinusoidal wave is larger than their input current, leading to increased conduction losses. This paper proposes a PWM modulated RSCC to reduce conduction losses by generating the trapezoidal wave current. In addition, the trapezoidal wave current can further reduce current stresses due to reducing current amplitude. A prototype verification test demonstrated the reduction of conduction losses by approximately 12% compared to the conventional method.

Multi-Phase Reconfigurable LLC Resonant Converter with Passive Current Balancing and Wide Voltage Gain Range

Authors

Yuta Arakawa,Masatoshi Uno

Published Date

2023/5/22

Voltages of lithium-ion batteries for electric vehicles vary in the range of 100–420 V depending on their state-of-charge. On-board battery chargers need a large-current capacity isolated dc-dc converter with a wide voltage gain range. Although multi-phase LLC converters are a typical solution to enhance the current capacity, additional components and feedback control loops are necessary to balance phase currents, resulting in increased circuit complexity and cost. This paper proposes the multi-phase LLC resonant converter with passive current balancing capability and wide voltage gain range. Phase currents are passively balanced thanks to the charge conservation of added flying capacitors. Furthermore, reconfigurable primary- and secondary-side circuits achieve the voltage gain range twice wider than that of conventional converters. The experimental verification using a 1-kW prototype demonstrated the …

台形波電流の生成により導通損失を低減可能な, EV 用共振形スイッチトキャパシタコンバータ

Authors

近藤蘭馬, 鵜野将年

Journal

電気学会研究会資料. SPC= The papers of technical meeting on semiconductor power converter, IEE Japan/半導体電力変換研究会 [編]

Published Date

2023

ダイケイハ デンリュウ ノ セイセイ ニ ヨリ ドウツウ ソンシツ オ テイゲン カノウ ナ, EV ヨウ キョウシンケイ スイッチトキャパシタコンバータ

DAB Converter Performing Internal AC Heating and Power Transfer Simultaneously for Lithium-Ion Battery in Electronic Vehicles

Authors

Koki Hida,Hyoga Hiranuma,Masatoshi Uno

Published Date

2023/11/28

Lithium-ion batteries (LIBs) significantly increased internal resistances at low temperatures, shortening the cruising distances of electric vehicles. Hence, LIBs require to be properly preheated. Internal ac heating techniques utilizing the Joule heat originating from LIB’s internal resistances have been proposed as an efficient heating method. A dual active bridge (DAB) converter integrating the internal ac heating inverter has been proposed. However, using a sinusoidal reference signal, the conventional control strategy cannot perform stable power transfer during internal ac heating. This paper proposes a control strategy to perform stable power transfer and internal ac heating simultaneously by changing the switching patterns every half-cycle of the ac heating current. Experimental results demonstrated that internal ac heating and stable power transfer can perform simultaneously.

Cell Voltage Equalizer with AC Internal Heating Capability for Automotive Lithium-Ion Batteries

Authors

Takumi Sugiura,Masatoshi Uno

Published Date

2023/5/22

Lithium-ion batteries (LIBs) for electric vehicles (EVs) require a cell voltage equalizer and a heater for preheating to avoid a decrease in cruising distance at low temperatures. Internal ac heating techniques can heat LIBs uniformly and efficiently by utilizing Joule heat generated by LIBs’ internal resistances. However, the LIB system using internal ac heating techniques needs an additional inverter to generate an ac current, resulting in increased system complexity and cost. This paper proposes an equalizer with an internal ac heating capability. The proposed equalizer employs a dual active bridge (DAB) converter and utilizes a half-bridge circuit of the DAB converter as an inverter, achieving a simplified system and reduced cost compared with the LIB system containing an additional inverter. Experimental results demonstrated that, in addition to the equalization capability, the proposed equalizer could warm up the …

リチウム・イオン電池 & 直列/並列回路入門: 重要技術セル・バランス図解! 長寿命で安全を目指して

Authors

鵜野将年

Journal

(No Title)

Published Date

2023

リチウム イオン デンチ & チョクレツ/ヘイレツ カイロ ニュウモン: ジュウヨウ ギジュツ セル・バランス ズカイ! チョウジュミョウ デ アンゼン オ メザシテ

Current Balancing Three-Phase Interleaved Resonant Converter with 1.5 x Step-Up Conversion Ratio for High-Voltage EV Batteries

Authors

Yuto Fujii,Masatoshi Uno

Journal

IEICE Technical Report; IEICE Tech. Rep.

Published Date

2023/1/12

(in English) Voltages of batteries of electric vehicles (EVs) are increasing to 600–800 V. Resonant converters with fixed 1.5 x step-up ratio have been proposed as on-board converters to utilize existing 500 V chargers. Meanwhile, multi-phase interleaved converters are known to enhance input/output current capacities for large current during quick charging. However, additional current sensors and feedback control loops are necessary to actively balance multiple phase currents, resulting in increased system cost. This paper proposes a passive current balancing three-phase interleaved resonant converter with 1.5 x step-up ratio. Phase currents in the proposed converter are passively balanced thanks to the charge conservation of capacitors. Furthermore, zero-voltage switching (ZVS) achieves high efficiency. The experimental verification using a prototype demonstrated the passive current balancing capability.

Estimation of Energy Yield of a Solar Roof on EVs with Differential Power Processing Converter using a 3D Model and Validation of the Analytical Model

Authors

Ryota Hiraide,Masatoshi Uno

Published Date

2023/11/28

A photovoltaic (PV) panel comprises multiple series-connected substrings of cells, which are then connected in series. In curved PV panels mounted on the roofs of electric vehicles (EVs), variations in electrical characteristics among cells and substrings cause a significant reduction in power generation. As a solution, a Differential Power Processing Converters (DPPCs) has been proposed to improve power generation by quasi-uniformize the electrical characteristics. However, to achieve uniform electrical characteristics across all cells, a combination of cell-level and substring-level DPPCs is required, increasing the system's cost. Therefore, it is desirable to determine the level of DPPC installation by considering the increase in power generation, and an analytical model is needed to predict the power generation of curved PV panels accurately. This paper reproduces the 56-cell PV panel installed in the Prius PHV …

熱電発電モジュール用カスケード昇降圧コンバータと単一電流センサのみによる逐次最大電力点追尾制御の実機検証

Authors

林広才, 菅谷礼央那, 小野寺哲, 鵜野将年

Journal

電子情報通信学会技術研究報告; 信学技報

Published Date

2022/1/20

抄録 (和) 多直列接続した熱電発電モジュールでは温度ばらつきにより電気特性が不均一化し, 発電量が大幅に低下する. 発電量を最大化させるためにはモジュール毎の最大電力点追尾 (MPPT) 制御が必要となるが, モジュールと同数の電圧/電流センサを要するため高コスト化を招く. 本稿では, カスケード昇降圧コンバータを利用した逐次 MPPT 制御手法を提案する. 提案制御手法では, モジュール毎に逐次 MPPT 制御を行うことで単一の電流センサによる制御が可能なため低コスト化を達成する. また, 各モジュールのインタリーブ動作によりインダクタの小型化を実現する. 3 モジュール用試作回路を用いた実機検証により各モジュールの逐次 MPPT 制御を実証した.

See List of Professors in Masatoshi Uno University(Ibaraki University)

Masatoshi Uno FAQs

What is Masatoshi Uno's h-index at Ibaraki University?

The h-index of Masatoshi Uno has been 24 since 2020 and 30 in total.

What are Masatoshi Uno's top articles?

The articles with the titles of

受動電流バランスとインダクタ電流のリプル低減が可能なインタリーブ昇降圧コンバータ

EV 搭載バッテリの台形波交流加熱を実現する 3 レベルフライングキャパシタインバータ

Interleaved Buck-Boost Converter with Passive Current Balancing and Inductor Current Ripple Reduction

ZVS Resonant Switched Capacitor Converter with 1.5 X Fixed Step-Up Ratio for EV Batteries

Evaluation of Power Generation of Photovoltaic Panel on EVs with Cell-and Substring-Level Differential Power Processing Converters Using 3D Model

DAB Converter Integrating Trapezoidal-Wave Internal Heating Inverter for Automotive Lithium-Ion Batteries at Subzero Temperatures

1.5 倍の固定昇圧比を有する EV 搭載バッテリ用 ZVS 共振形スイッチトキャパシタコンバータ

単一インダクタを有する太陽光発電システム用カスケードマルチポートコンバータの解析

...

are the top articles of Masatoshi Uno at Ibaraki University.

What are Masatoshi Uno's research interests?

The research interests of Masatoshi Uno are: Power Electronics

What is Masatoshi Uno's total number of citations?

Masatoshi Uno has 3,466 citations in total.

    academic-engine

    Useful Links