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）

In order to realize carbon neutrality by 2050, it is necessary to achieve renewable energy as main power source. Renewable energy is connected to the grid through power converters. It is expected that the performance of power converters will continue to improve for the effective use of electrical energy. This paper investigates the current performance of power electronics devices, and introduces the evaluation items of the roadmap of the future power converters.

DOI： 10.23919/IPEC-Himeji2022-ECCE53331.2022.9807026

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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）

The Japanese government has declared that Japan would realize carbon-neutrality by 2050. Japan's 2050 energy scenario has been released. This paper analyzes the installed capacity of renewable energy -photovoltaics and wind turbines- and battery energy storage systems required for the realization of the carbon neutral in 2050 referred to the 2050 energy scenario. In addition, we estimate the values for 2030 and 2040 as milestones. From these values, the total amount of power electronics equipment can be estimated. And as a result, the contribution of progressing power electronics technology for the realization of carbon neutral is evaluated quantitatively.

DOI： 10.23919/IPEC-Himeji2022-ECCE53331.2022.9807188

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

The shoot-through fault in inverters results from a gate noise voltage of power semiconductor switches including IGBTs. Testing the gate voltage under the high-speed switching event is important to evaluate immunity to the fault as well as to analyze the mechanism of the fault. This paper presents a testing method of shoot-through immunity in a PWM inverter consisting of IGBTs because the conventional double-pulse test can miss the shoot-through fault in the inverter. Theoretical analysis reveals that the N-base charge has influence on the gate-emitter voltage in the IGBT, which disturbs evaluating the shoot-through immunity in the inverter. This implies that IGBTs have a different characteristic from MOSFETs when the double-pulse test is carried out. The testing method introduces an additional pulse into the off-state IGBT to release the N-base charge, the circuit operation of which is the same as the inverter. Experimental results confirmed that the method did not affected by the N-base voltage, so that it is applicable to testing the shoot-through immunity of IGBTs in an inverter.

DOI： 10.1016/j.microrel.2021.114289

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担当区分：筆頭著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）

<p>はじめに</p><p>スマートフォンに代表される情報通信端末の軽薄化に伴い，それら端末に搭載される電源にも軽薄化が求められており，電源の集積化技術の発展への要求が強まってきている。</p>

DOI： 10.1541/ieejjournal.141.657

CiNii Article

CiNii Research

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担当区分：筆頭著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）

<p>1．はじめに</p><p>近年，大学での成果を社会に還元するための一つの方法として，大学教員が自身の研究成果をもとにベンチャー起業を立ち上げる試みがなされている。また，それを推進するためのいく</p>

DOI： 10.1541/ieejjournal.141.262

CiNii Article

CiNii Research

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担当区分：責任著者   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）

An Energy Harvesting (E.H.) has been paid attention for the field of Internet of Things (IoT) in recent years. The wireless sensor as a key component of IoT can be realized battery less operation by using E.H technology. The oscillating circuit with a step-up transformer is used as a voltage booster for E.H. The voltage booster has not been fully analyzed the influences of the circuit parameters yet. In this paper, the influence of JFET parameters such as parasitic capacitance and threshold voltage are analyzed, and the self-oscillating voltage booster is designed including the JFET parameters. As a result, it is clarified that the large additional capacitance connected into gate-source terminal of JFET can be remarkably reduced the influence of input capacitance of JFET. Moreover, the relationship between threshold voltage and amplitude condition are clarified. Finally, the validity of the analysis and design method are experimentally confirmed.

DOI： 10.1109/TENCON50793.2020.9293864

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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）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

Attention has been paid to the next-generation IGBT toward CMOS compatible wafer processes, which can be driven by a 5-V logic level due to its low threshold gate voltage. This low threshold voltage makes the so-called shoot-through fault severer. Even though the switching speed of the IGBT is intentionally reduced, the shoot-through fault can happen. This paper presents shoot-through protection for an inverter consisting of the next-generation IGBTs with gate impedance reduction. Theoretical analysis reveals the criterion of the gate impedance with taking parasitic parameters of the inverter into account.

DOI： 10.1016/j.microrel.2020.113765

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

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）

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）

© 2019 IEEE. Power supply on chip (power-SoC) has been caught attentions because ultimately miniaturize the power supplies. Especially, the 3D power-SoC is attractive and is fabricated using LSI and MEMS process. It is important to meet the various electrical requirements for expanding applications because they are fabricated using mass production process. In such situations, series and/or parallel connections of them is attractive. However, we generally use transformers as power supplies for floating gate driver circuits when we connect DC-DC converters series. Transformers are not suitable for power-SoC because they disturb miniaturization. In this paper, we propose a transformer-less floating gate driver circuit for 3D power SoC.

DOI： 10.1109/3DIC48104.2019.9058891

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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）

© 2019 EPE Association. In this paper, we propose a novel software defined power supply using the general purpose DSP (Digital Signal Processor) and its control algorithm based on power supply on chip. The proposed power supply can regulate the output voltage only loading a program into the DSP without adjusting the parameters and changing the external parts. Also, it can change the output voltage according to the state of the load by executive instruction from the load. The simulation results show that the transient response depends on the inductance, the capacitance and the internal resistance, and expects sub-μ s. at switching frequency of 30 MHz.

DOI： 10.23919/EPE.2019.8914949

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2019 Elsevier Ltd The higher current density of IGBTs has made it difficult to achieve high short-circuit withstand capability as well as good conduction characteristics. Therefore, a fast and reliable protection system is required for the safe operation of IGBT. This paper determines the short-circuit safe protection area (SCSPA) for advanced IGBT that has no short-circuit withstand capability and proposes the protection system satisfied this SCSPA. The fast protection is brought by PCB Rogowski coil and digital gate driver using digital circuit (FPGA). Experimental results verify that short-circuit detection time is 70 ns, shut-down time is reduced by controlling the gate resistance at turn-off.

DOI： 10.1016/j.microrel.2019.113408

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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）

© 2019 IEEE. Negative biasing of the gate voltage in a scaled insulated gate bipolar transistor (IGBT) during the off-state was modeled and found to be effective against self-turn-on failures. The required self-turn-on-free criteria were verified experimentally.

DOI： 10.1109/ISPSD.2019.8757665

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2019 The Institute of Electrical Engineers of Japan. In this paper, we propose a new control algorithm for a novel fully digital-controlled H-bridge DC-DC converter, which can output the power in both boost and buck mode by only rewriting three digital codes: input voltage, output voltage, and maximum load current. In addition, the proposed algorithm improves the transient response.

DOI： 10.1541/ieejjia.8.813

Scopus

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CiNii Research

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担当区分：筆頭著者   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）

© 2018 IEEJ Industry Application Society. A power-SoC can realize compact and thin power supply although the power capacity is very small (low voltage input and low voltage / current output). The isolated power supplies are required to achieve the hybrid connection of series and parallel in order to adapt the high input voltage and high current output applications. On the other hand, the switching frequency tends to be very high due to small passive components. However, the loss of the magnetic material becomes severe problem. In this paper, the air core transformer is adapted and the current resonant converter is evaluated as an example of isolated power-SoC. Moreover, the isolated power supply is implemented on PCB in order to confirm the operating principle of the isolated power-SoC.

DOI： 10.23919/IPEC.2018.8507767

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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）

© 2018 IEEJ Industry Application Society. In this paper, we propose a new control algorithm for a novel full digital control H-bridge DC-DC converter which can output the power in both boost and buck mode only rewriting three digital code such as input voltage, output voltage, and maximum load current. In addition, the proposed algorithm improves the transient response.

DOI： 10.23919/IPEC.2018.8507832

Scopus

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担当区分：責任著者   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）

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 Elsevier Ltd In this paper, we propose the criteria of bias voltage from parasitic capacitance and demonstrate the criteria in an experiment with the present IGBT. The bias voltage criteria are theoretically predicted for the new generation IGBT based on the scaling principle. For safe switching, the required gate voltage bias is predicted to be −1.2 V or less for the present IGBTs and − 6 V or less is required to completely cancel the gate noise voltage. From the IGBT design, the bias voltage of scaling IGBT requires −2 V to completely cancel the gate noise voltage.

DOI： 10.1016/j.microrel.2018.06.026

Scopus

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担当区分：筆頭著者   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）

© 2017 IEEE. A Vertical-Cavity Surface-Emitting Laser (VCSEL) has attracted a strong interest as a pump source of diode pumped solid state (DPSS) lasers for many applications, such as welding, cutting and marking, in recent years. In the past, a series dropper has been typically used as a laser driver. However, the power loss of series dropper which adopts several kW class high power laser is very large, and the cooling system becomes much larger and whole driver is also much larger. In order to solve these problems, switch mode power supply (SMPS) is adopted as a laser driver. However, switch device breakdown problem occurs in this case. This paper clarifies the mechanism of mentioned above problem and proposes the solution technique.

DOI： 10.1109/PEDS.2017.8289197

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担当区分：筆頭著者   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）

© assigned jointly to the European Power Electronics and Drives Association & the Institute of Electrical and Electronics Engineers (IEEE) The realization of wide input voltage and high power density on the conventional current resonant converter such as LLC converter remarkably increases transformer winding loss and its design difficulty. Therefore, it is difficult for the conventional LLC converter to satisfy both requirements. In order to apply the LLC converter with both conditions, this paper investigates the mechanism of the transformer winding loss occurrence in the conventional LLC converter. Moreover, the solution for mentioned above problems is proposed which can removes the transformer design difficulty as well by only changing the resonant operation mode.

DOI： 10.23919/EPE17ECCEEurope.2017.8099085

Scopus

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2017 Elsevier Ltd The shoot-through phenomenon has not been fully discussed for high-power inverters with IGBTs. This is because a negative gate voltage is applied to IGBTs during off states. Recently, attention is paid to an improved gate driver with only a positive gate voltage in order to meet demands for simplification, integration, and reduction in power consumption as well as in cost of the gate driver. Moreover, the threshold voltage of the next-generation IGBT will decrease with microfabrication techniques of the gate structure. This will make the shoot-through phenomenon severer and degrade the inverter reliability with the next-generation IGBTs. The influence of the parasitic parameters in both the IGBT and circuit on the shoot-through mechanism has not been investigated so far. This paper clarifies the shoot-through mechanism and investigates the impact of the next generation IGBTs on the inverter reliability. The influence of the internal capacitance of IGBT including stray inductance on inverter reliability is experimentally confirmed.

DOI： 10.1016/j.microrel.2017.06.087

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担当区分：責任著者   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）

© 2017 IEEE. A current resonant converter including wider input voltage range and higher power density is required for various applications. However, in our study, it has been found that the drastic increasing of the transformer winding loss becomes a severe problem. This paper clarifies the mechanism of transformer winding loss occurrence and proposes the different resonant mode operation which solves the problem of the huge transformer loss.

DOI： 10.1109/IFEEC.2017.7992153

Scopus

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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）

© 2017 IEEE. This paper describes electrical characteristics of a silicon based multi-tens MHz gate driver IC for GaN power devices. The fabricated gate driver IC can operate 50 MHz and drive the GaN power device when sine wave inputs. We fabricated prototype synchronous back converter using GaN power devices and the fabricated driver IC. The fabricated buck converter can operate at 30 MHz and results show that the most important challenge for high frequency POL is to reduce parasitic impedance. The simulation results show that a 3D stacked power supply on chip effectively reduces the parasitic impedance and improves the efficiency.

DOI： 10.1109/APEC.2017.7930969

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2017 IEEE. A general-purpose clocked gate driver integrated circuit (IC) to generate an arbitrary gate waveform is proposed to provide a universal platform for fine-grained gate waveform optimization handling various power transistors. The fabricated IC with a 0.18 μm Bipolar-CMOS-DMOS process has 63 P-type MOS (PMOS) and 63 N-type MOS (NMOS) driver transistors on a chip whose activation patterns are controlled by 6-bit digital signals and 40 ns time step control. In the 500 V switching measurements with a manual gate waveform optimization, the proposed gate driver reduces the ICovershoot by 25% and 41%, and the energy loss by 38% and 55% for Si-insulated-gate bipolar transistor and SiC-MOSFET, respectively, which demonstrate the feasibility of driving various power devices with the same driver. An automatic optimization by simulated annealing algorithm is introduced to fully utilize the benefit of the gate driver, and the further reduction of ICovershoot by 26% and the energy loss by 18% are achieved over the manual optimization.

DOI： 10.1109/TIA.2017.2674601

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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）

© 2016 IEEE. A general-purpose clocked gate driver (CGD) IC to generate an arbitrary gate waveform is proposed to provide a universal platform for fine-grained gate waveform optimization handling various power transistors. The fabricated IC with 0.18μm BCD process has 63 PMOS and 63 NMOS driver transistors on a chip whose activation patterns are controlled by 6-bit digital signals and 25-MHz clock (= 40-ns time step control). In the 500-V switching measurements, the proposed CGD reduces the IC overshoot by 25% and 41% and the energy loss by 38% and 55% for Si-IGBT and SiC-MOSFET, respectively.

DOI： 10.1109/APEC.2016.7468086

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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）

© 2016 IEEE. In this paper, a high power-density output-inductor-less full-bridge converter for the HVDC power distribution system is proposed. The new reduction techniques of switching loss and noise in the output-inductor-less full-bridge converter by using SiC-MOSFETs are applied. As the result, the power loss is reduced by 20W in a wide load range, and the noise is also reduced. Furthermore, a high power density of 15W/cm3 is achieved by the experimental breadboard with power level of 1kW.

DOI： 10.1109/APEC.2016.7468205

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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）

© 2016 IEEE. Output-inductor-less full-bridge converter for a High-Voltage Direct-Current power distribution system has been proposed. This proposed circuit topology suppresses the surge voltage due to the secondary-side diode's recovery, and miniaturizes the converter because the number of circuit components is reduced. On the other hand, some problems occur, such as the increasing switching-loss of primary switches and another high-frequency noise generation. This paper proposes a novel synchronous rectifier driving for the output-inductor-less full-bridge converter in order to solve these problems, and examines the noise reduction effect, and the relationship between ZVS operation conditions and circuit parameters. The proposed method does not need an external component, and then the smaller size is maintained. Furthermore, the experimental results confirm the power loss reduction of 20W in a wide load range, and also the noise reduction.

DOI： 10.1109/ECCE.2016.7855453

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2016 The Institute of Electrical Engineers of Japan.A major problem in high-voltage full bridge dc-dc converters is the high-voltage surge that occurs across the secondary-side rectifying diodes. In order to solve this problem, a simple solution with a snubber capacitor has been proposed. This technique provides effective surge-voltage suppression. On the other hand, it degrades the control characteristics of this converter. In this paper, the control characteristics are analyzed by the state-space averaging method. On the basis of this analytical result, a novel technique for control characteristics improvement is proposed. Experiments confirm the effectiveness of the proposed technique.

DOI： 10.1541/ieejjia.5.184

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

近年、情報通信機器の高機能化や低消費電力化が進む中、小型で高効率かつ出力電圧を多数有する電源の実現が求められている。本研究では、電源の究極の小型化を目指したSi基板上のPOL(Point of Load)であるPower-SoC(Supply on Chip)を実現する一環として、デジタル制御を用いた新しい制御方法を提案し、同時に二つの異なる電圧の出力を実現した。その結果、FPGAやDSPのデジタルコードを書き換えるだけで、POLが出力する複数の供給電圧を容易に変更することが可能になり、高効率スイッチングも達成することができた。また昇圧と降圧を組み合わせた電圧の出力を実現し、入力電圧の値によらず様々な電庄を出力できることも明らかにした。

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/110010001597

記述言語：英語   掲載種別：研究論文（学術雑誌）

本稿では、空芯コイルを用いたパワーSoC用絶縁型DC-DCコンパータを提案する。空芯コイルとトランスの特性をシミュレーションにより検討するとともにPCB上に空芯コイルを試作し,評価した。これらの結果を用いてパワーSoC用絶縁型DC-DCコンバータの動作を確認した。また,GaN-FET用の10MHz級のゲートドライバー回路の検討結果についても報告する.

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/110010001598

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2015 The Institute of Electrical Engineers of Japan. This paper presents a novel load regulation technique for parallel-connected POLs which reads for power supply on chip (power-SoC). In power-SoCs, many POLs are implemented on the same chip. In this case, the conventional loop control (feedback control) may have problems such as oscillation. The proposed strategy regulates the output voltage by changing the number of working POLs under fixed duty ratio. The parallely connected POL system is implemented using MATLAB/Simulink, and the operating characteristics are confirmed. In addition, the proposed control strategy is also verified experimentally.

DOI： 10.1541/ieejjia.4.732

Scopus

CiNii Article

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記述言語：日本語   掲載種別：記事・総説・解説・論説等（商業誌、新聞、ウェブメディア）

記述言語：日本語   掲載種別：記事・総説・解説・論説等（商業誌、新聞、ウェブメディア）

記述言語：英語   掲載種別：研究論文（学術雑誌）

フルブリッジコンバータにおいて,二次側ダイオードに発生するサージ電圧を抑制するためにコンデンサを挿入する方法が提案されており,優れたサージ抑制効果が確認されている.また,このスナバ回路はコンデンサのみで構成されるため回路の小型化に貢献する.しかし,コンバータの動作が変化し,一次側スイッチのスイッチング損失が増加することが新たな問題となっている.本稿ではスパナコンデンサ付きフルブリッジコンバータのPWM制御によるスイッチング損失低減の手法について検討し,定格出力においてスイッチの損失を約1/4に低減し,96%の効率が得られた.

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/110009971202

記述言語：日本語   掲載種別：記事・総説・解説・論説等（商業誌、新聞、ウェブメディア）

記述言語：日本語   掲載種別：記事・総説・解説・論説等（商業誌、新聞、ウェブメディア）

記述言語：日本語   掲載種別：記事・総説・解説・論説等（商業誌、新聞、ウェブメディア）

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）

© 2014 IEEE. A power supply on chip (SoC) has been attracted attentions of many researchers because it can realize ultimate minimization of the power supply. It is quite promising for ICT applications because its features, such as smaller volume, high frequency response, and so on, fit for requirement of POL used in ICT equipment. In this paper, we propose the novel concept of digitally controlled multiple output POLs suitable for power SoC. We also report the simulation and experimental results of the proposed strategy. The results show that the proposed strategy enables to supply various output voltages using boost and back modes at the same time and improves the efficiency over the wide range. In addition, the voltage regulation through voltage detection is preferable compared with that through current detection because the voltage based technique can supply multiple voltages by only rewriting the digital code of FPGA or DSP.

Scopus

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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）

This paper proposes the simple and seamless operation technique for bi-directional LLC converter. Generally, bi-directional operation of LLC converter is complicated and difficult to control. Because, the switching frequency has to be changed across fsr (series resonant frequency) and the switching sequences has to be also changed due to resonant characteristics. In order to simplify the switching scheme, the switching frequency is moved to higher frequency than fsr where ZVS condition is maintained and simple switching sequence is achieved for both direction. The experimental results for 400Vin, 48Vo, 300W board achieves 93% efficiency and validated this method is useful practically. © 2014 IEEE.

DOI： 10.1109/APEC.2014.6803582

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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）

This paper proposes the new LLC converter with unique control method. Generally, LLC resonant converter, which is controlled by PFM, has the drawback of (1) difficulty of PWM controllability, (2) difficulty of constant current limitation, and (3) narrow input voltage range limitation. These difficulties come from the resonant operation. In order to overcome those drawbacks, a hybrid control of PFM and PWM is employed for LLC. The resonant frequency is set to lower frequency to generate triangle current waveform, and the output voltage can be controlled by PWM and PFM through adjustment of resonant inductor energy. The experimental results for 48Vin, 16Vo, 80W board achieves 90% efficiency and validated this method is useful practically. © 2014 IEEE.

DOI： 10.1109/IPEC.2014.6869577

Scopus

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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）

This paper proposes the simple and seamless operation technique for bi-directional LLC resonant converter. Generally, bi-directional operation of LLC resonant converter is complicated and difficult to control. Because, the switching frequency has to be changed across fsr (series resonant frequency) and the switching sequences (the switching timing between high voltage side and low voltage side) has to be changed due to resonant characteristics as well. In order to simplify the switching scheme between forward and reverse direction, the switching frequency has been moved to higher frequency than series resonant frequency where ZVS condition is maintained. As a result, the simple switching sequence has been achieved for both forward and reverse direction. The experimental results for 400Vin, 48Vo, 300W board achieves 93% efficiency and validated this method is useful practically. © 2014 IEEE.

DOI： 10.1109/IPEC.2014.6869736

Scopus

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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）

In this study, integrated H-bridge converter with the Matrix-POL power supply system is proposed. From the simulation results, the validity of the Matrix-POL is revealed. The results revealed that the fast response to the load current and the voltage change can be done with duty and parallel number control by the proposed system. © 2014 IEEE.

DOI： 10.1109/IPEC.2014.6869898

Scopus

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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）

A high-voltage full bridge dc-dc converter has a big problem of high-voltage surge occurrence across secondary-side rectifying diodes. In order to solve this problem, a simple solution with a snubber capacitor has been proposed. This technique provides a prominent effect of surge-voltage suppression. On the other hand, it deteriorates the control characteristics of this converter. In this paper, the control characteristics are analyzed by the state-space averaging method. Based on this analytical result, the improvement of the control characteristics is proposed. Some experiments confirm the effectiveness of the proposed technique. © 2014 IEEE.

DOI： 10.1109/IPEC.2014.6870023

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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）

In this study, integrated buck-boost converter with the Matrix-POL power supply system is proposed. From the simulation results, the validity of the Matrix-POL is revealed. The results revealed that the fast response to the load current and the voltage change can be done with duty and parallel number control by the proposed system. © 2013 IEEE.

DOI： 10.1109/EPE.2013.6634626

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

In an isolated DC-DC converter utilized in a high-voltage DC power distribution system for data centers, a large surge voltage occurs across the secondary-side diodes owing to the transformer's leakage inductance, necessitating diodes with a large withstand voltage. However, these diodes cause large power losses owing to relatively large ONresistances. First, this study analyzes surge occurrences using a high-frequency equivalent circuit. Second, the surgesuppression capability of a simple snubber capacitor is examined, and the surge-voltage evaluation through analysis using high-frequency equivalent circuits is described. This is followed by experimental confirmation with SiC diodes. Finally, the minimum capacitance of the surge-snubber capacitor is determined for miniaturization. © 2014 The Institute of Electrical Engineers of Japan.

DOI： 10.1541/ieejias.133.1171

Scopus

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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）

In recent years, a power supply on chip (SoC) has been attracted attentions of many researchers because it can realize ultimate minimization of the power supply. This realizes higher electric power density and lower manufacturing cost. However, it is necessary to connect parallel at heavy loading conditions because this can handle smaller power per chip. In addition, switching frequency of more than 10 MHz is required for reducing the volume of the power supply. In such a scheme, the traditional analog based PWM will face the problems and a new control strategy is required. This paper proposes a new control strategy of the power-SoC based on parallel connections of dc-dc converters by digital control. We also report the simulation and experimental results of the proposed strategy. The results show that the proposed strategy works well and improves the efficiency over the wide range. © 2013 IEEE.

DOI： 10.1109/PEDS.2013.6526998

Scopus

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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）

This paper presents the high power density and high efficiency DC-DC converter for 400V-DC power distribution system. The full-bridge converter is used for typical topology. However, there are some problems such as surge voltage occurrence. Here, the miniaturization of isolated DC-DC converter using the LLC resonant converter which can achieve soft-switching operation without auxiliary circuit is considered. The prototype test circuit is evaluated by experimentally. As a result, the high power density of 12.5W/cm3 and high efficiency of over 95% is achieved. © 2013 IEEE.

DOI： 10.1109/PEDS.2013.6527216

Scopus

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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）

This paper investigates the topology selection of the current resonant converter for bidirectional applications. The current resonant converter has several topologies which categorized switch network construction and resonant network construction. It is important that the topology is selected suitable for each application from several circuit topologies. In this paper, the operating characteristics are discussed in detailed in order to evaluate the appropriateness for each application. Moreover, the applicable topology is selected from detail operating characteristics. © 2013 IEEE.

DOI： 10.1109/PEDS.2013.6527006

Scopus

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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）

This paper presents the novel driving technique of synchronous rectifier (SR) for the LLC converter. The unique characteristic of 'Vo D=constant' of LLC converter is utilized to predict optimal duty ratio D, where D is the conduction period of secondary diode. This technique does not need the sensing of SR current neither SR voltage. Additionally, the auto tuning technique is implemented to adjust the duty ratio precisely as well by digital control using TI's DSP of Piccolo TMS320F28027. The technique is confirmed by experimentally. © 2013 IEEE.

DOI： 10.1109/APEC.2013.6520478

Scopus

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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）

So far, the operating characteristics of asymmetry type current resonant converter as LLC converter are discussed in detail. However, the detail operating characteristics discussions of symmetry type resonant converter have not been carried out. This paper investigates the AC characteristics of symmetry type bi-directional current resonant converter, and their soft-switching regions are also investigated. © 2012 IEEE.

DOI： 10.1109/ICRERA.2012.6477394

Scopus

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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）

In an isolated DC-DC converter utilized in the HVDC power distribution system, a large surge voltage occurs across the secondary-side diodes due to the transformer's leakage inductance, and then the diodes with a large withstand voltage are required. However, those diodes cause a lot of power loss. In this paper, a simple surge snubber with prominent surge suppression capability is examined, and the surge-voltage evaluation through the analysis using the high-frequency equivalent circuits, which is followed by the experimental confirmation. Furthermore, the the optimum design of its surge-snubber capacitor is presented. © 2012 IEEE.

DOI： 10.1109/ICRERA.2012.6477261

Scopus

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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）

This paper presents the novel driving technique of synchronous rectifier (SR) for the LLC converter. The unique characteristic of "Vo*D= constant" of LLC converter is utilized to predict optimal duty ratio D, where D is the conduction period of secondary diode. This technique does not need the sensing of SR current neither SR voltage. The technique is confirmed by experimentally. © 2012 IEEE.

DOI： 10.1109/INTLEC.2012.6374544

Scopus

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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）

This paper discusses the operating characteristics of push-pull type series resonant converter. The AC equivalent model and AC analysis of push-pull type series resonant converter are confirmed by analytically and experimentally. Moreover, the operating characteristics of push-pull type series resonant converter including SR are also investigated. © 2012 IEEE.

DOI： 10.1109/INTLEC.2012.6374481

Scopus

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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）

In renewable energy systems such as the PV system, the batteries are connected to ensure a stable supply of energy. Therefore, the bi-directional power conditioners have a key role in renewable power systems. In this paper, bi-directional LLC resonant converter as the power conditioner is proposed. The ac analysis and operating characteristics of bi-directional LLC resonant converter are investigated. © 2012 IEEE.

DOI： 10.1109/ICRERA.2012.6477405

Scopus

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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）

Recently, the series resonant converter is widely used for various applications. Moreover, the synchronous rectifier technique has been investigated in low voltage application achieving higher efficiency. The bi-directional series resonant converter can be realized by establishing the synchronous rectifier technique. This paper investigates the ac equivalent model and operating characteristics of bi-directional series resonant converter. © 2012 IEEE.

DOI： 10.1109/COMPEL.2012.6251769

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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）

In DC power supply system, a fast response circuit breaker is required. Semiconductor DC circuit breaker is an important key technology in DC power supply system. This paper considers the operating characteristics of Silicon Carbide-Static Induction Transistor (SiC-SIT) based DC circuit breaker in DC power supply system when grounding fault occurs. The operating mechanism of grounding fault case is explained compared with short fault case. © 2012 IEEE.

DOI： 10.1109/APEC.2012.6166125

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記述言語：英語   掲載種別：研究論文（学術雑誌）

This paper presents the design consideration of a low-profile LLC resonant converter using two flat transformers. The trend toward high power density, high efficiency, and low profile in power supplies has exposed a number of limitations in the use of magnetic component structures. The LLC resonant converter can be operated at a high switching frequency with high efficiency because the switching loss is reduced by soft-switching. However, flat transformer loss causes problems at a high switching frequency. As a result, temperature of flat transformers becomes high. Therefore, it is necessary to reduce the transformer temperature by analyzing the loss. In this proposed converter, flat transformer is integrated into advanced power conversion application systems. Low-profile power module of profile of about 14mm is achieved. Temperature inside of transformer repressed to 66.5 and an overall efficiency of about 96.5% was obtained.

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

400V DC power distribution systems for data centers require a fast response DC circuit breaker is required. The semiconductor DC circuit breaker is an important key technology in DC power distribution systems. This paper considers the malfunction of Silicon Carbide-Static Induction Transistor (SiC-SIT) based DC circuit breakers in 400V DC power distribution systems for data centers. The malfunction mechanism is explained, and a solution is proposed. Investigations are achieved by MATLAB/Simulink and experimental verification. Copyright © 2012 The Institute of Electronics, Information and Communication Engineers.

DOI： 10.1587/transcom.E95.B.1990

Scopus

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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）

In DC power supply system, a fast response circuit breaker is required. Semiconductor DC circuit breaker is an important key technology in DC power supply system. This paper considers the malfunction issue of Silicon Carbide-Static Induction Transistor (SiC-SIT) based DC circuit breaker in DC power supply system. The malfunction mechanism is explained, and a solution methodology proposed. Investigations are achieved by MATLAB/Simulink and experimented work. © 2011 IEEE.

DOI： 10.1109/PEDS.2011.6147232

Scopus

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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）

This paper presents the design consideration of a low-profile LLC resonant converter using tw,o flat transformers. The trend toward high power density, high efficiency, and low profile in power supplies has exposed a number of limitations in the use of magnetic component structures. The LLC resonant converter can be operated at a high switching frequency with high efficiency because the switching loss is reduced by soft-switching. However, flat transformer loss causes problems at a high switching frequency. As a result, temperature of flat transformers becomes high. Therefore, it is necessary to reduce the transformer temperature by analyzing the loss. In this proposed converter, flat transformer is integrated into advanced power conversion application systems. Low-profile power module of profile of about 14mm is achieved. Temperature inside of transformer repressed to 61C and an overall efficiency of about 97.8% was obtained. © 2011 IEEE.

DOI： 10.1109/ICPE.2011.5944626

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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）

This paper presents the power density developments of high-power isolated dc-dc converter to be utilized in a higher voltage direct-current (HVDC) power-supply system of a data center. This technique results in a prototype of dc-dc converter unit which is smaller by factor of ten when compared with the conventional one, and the area of power-supply system becomes much smaller than before. Consequently, the cooling power for this power-supply system is saved and both the energy and the space saving are available. In order to realize a prototype of the high-power isolated dc-dc converter, the switching power devices composed of a hybrid pair of Si-CoolMOS and SiC-SBD are utilized and operated in a driving pattern of hard switching with a frequency of 200kHz. As a result, an isolated dc-dc converter with the input/output voltage of 400V/400V, a rating power of 5kW, and a high power density of 10W/cm3 has been fabricated. The experimental confirmation was reported and the surge problems due to diode recovery difficulties mentioned before was solved. © 2011 IEEE.

DOI： 10.1109/APEC.2011.5744657

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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）

Nowadays high power density, high performance, and high efficiency converters become a hot issue of the PDP TV. For meeting requirements, the design and implementation of LLC resonant converter using low-profile magnetic component for PDP is proposed in this paper. In order to use a flat transformer, it is necessary to operate the converter at high switching frequency. In the LLC resonant converter, softswitching operations of main switches and diode rectifiers can be achieved. Therefore, the switching loss is reduced and we can operate the converter at higher switching frequency. However, it is a problem that low-profile transformer temperature becomes high at high switching frequency. Based on the theoretical analysis, simulation and experimental results, the design for reducing operating temperature of low-profile transformer is proposed in this paper. As a result, temperature inside of transformer repressed to 61 °C and an overall efficiency of about 97.8% was obtained. © 2010 IEEE.

DOI： 10.1109/ISIE.2010.5637064

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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）

This paper considers the malfunction mechanism of semiconductor circuit breaker in high voltage DC power supply system (HVDC). In HVDC system, the fast response breaker is required. Semiconductor circuit breaker is paid attention as one of the key technology in HVDC. However, in some condition, the semiconductor circuit is malfunctioned. When malfunction is happened, unexpected large current is flown to the other normal line. In this paper, the generation mechanism of unexpectedcurrent is described. © 2010 IEEE.

DOI： 10.1109/EPEPEMC.2010.5606638

Scopus

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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）

This paper presents the design of two flat transformers in LLC resonant converter. The trend toward high power density, high efficiency, and low profile in power supplies has exposed a number of limitations in the use of magnetic component structures. In the LLC resonant converter, the switching loss is reduced by soft-switching. Therefore, LLC resonant converter can be operated at high switching frequency with high efficiency. However, transformer loss becomes problems at high switching frequency. As a result, flat transformers temperature becomes high in proportion to the transformer loss. Therefore, it is necessary to reduce the transformer temperature by analyzing the loss. In this paper, design for reduction transformer temperature is presented. © 2010 IEEE.

DOI： 10.1109/EPEPEMC.2010.5606505

Scopus

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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）

This paper considers the malfunction mechanism of semiconductor circuit breaker in high voltage DC power supply system (HVDC). In HVDC system, the fast response breaker is required. Semiconductor circuit breaker is paid attention as one of the key technology in HVDC. However, in some condition, the semiconductor circuit is malfunctioned. When malfunction is happened, unexpected large current is flown to the other normal line. In this paper, the malfunction mechanism of semiconductor circuit breaker is considered. It demonstrated by using MATLAB/Simulink. Moreover, the demonstrated results are confirmed by experimentally. © 2010 IEEE.

DOI： 10.1109/ECCE.2010.5617785

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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）

This paper presents the design of two flat transformers in low-profile LLC resonant converter for low transformer loss. The trend toward high power density, high efficiency, and low profile in power supplies has exposed a number of limitations in the use of magnetic component structures. Therefore, LLC resonant converter can be operated at high switching frequency with high efficiency, because the switching loss is reduced by soft-switching. However, flat transformer loss becomes problems at high switching frequency. As a result, flat transformers temperature becomes high. Therefore, it is necessary to reduce the transformer temperature by analyzing the loss. In this paper, design for low transformer loss is presented. ©2010 IEEE.

DOI： 10.1109/TENCON.2010.5685947

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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）

In high voltage DC power supply system (HVDC) system, the fast response breaker is required. Semiconductor circuit breaker is paid attention as one of the key technology in HVDC. However, in some condition, the semiconductor circuit is malfunctioned. When malfunction occurs, unexpected large current is flown to the other normal line. In this paper, the malfunction suppression of semiconductor circuit breaker is described. It demonstrated by using MATLAB/Simulink Moreover, the demonstrated results are confirmed by experimentally. ©2010 IEEE.

DOI： 10.1109/TENCON.2010.5685956

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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）

Recently, the performance of the DSP and FPGA is developed remarkably. So, fully digital control is enabled in switch mode power supplies. However, in many cases, the control system is built by very complicatedly and very difficult theories such as the adaptive control. Furthermore, in most popular PID control, its design method of the parameters is not clear, so derivation of the optimal parameters is very difficult. This paper proposes the interesting control technique which is cancelled the transfer function of the converter by using pole-zero-cancellation method. This technique is very simple and easy to stability design. ©2010 IEEE.

DOI： 10.1109/TENCON.2010.5685896

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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）

This paper proposes an interesting control technique which cancels the transfer function of the converter by using pole-zero-cancellation method. The system stabilization design is easy to be realized by applying this technique. The impaired system stability caused by parameter variation is investigated, especially the influence of the output capacitance variation. Moreover, a parameter tracking method is included to solve the stability problem. © 2010 IEEE.

DOI： 10.1109/APCCAS.2010.5775052

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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）

The trend in Plasma Display Panel (PDP) TV is towards the thinner thickness, lighter weight, and fan-less system. For achieve this goal, it is desired advanced power conversion technique to implement a low-profile power supply for PDP. As PDP power module, LLC resonant converter is widely used because it can achieve both high efficiency and reliability. To achieve a low-profile circuit configuration, it is necessary to operate the converter at high switching frequency. LLC resonant converter can be operated at high switching frequency because of softswitching operations. However, it is a problem that the temperature of flat transformer becomes high at high switching frequency. In this paper, the method of reduction flat transformer temperature in LLC resonant converter for PDP is proposed by analysis of core loss and experiment. Low-profile power module of profile of about 14mm can be achieved. Temperature of transformer repressed to 71°C. © 2010 IEEE.

DOI： 10.1109/SPEEDAM.2010.5542174

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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）

Recently, the performance of the DSP and FPGA is developed remarkably. So, fully digital control is enabled in switch mode power supplies. However, in many cases, the control system is built by very complicatedly and very difficult theories such as the adaptive control. Furthermore, in most popular PID control, its design method of the parameters is not clear, so derivation of the optimal parameters is very difficult. This paper proposes the interesting control technique which is cancelled the transfer function of the converter by using pole-zero-cancellation method. This technique is very simple and easy to stability design. © 2010 IEEE.

DOI： 10.1109/SPEEDAM.2010.5542163

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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）

Low-profile, high efficiency power supply is today's industry trend for Plasma Display Panel (PDP) application system. Transformer is the major challenge and bottleneck for achieving low-profile, high power density converter. Generally, it is necessary for low-profile converter to operate it at high switching frequency. However, it is very difficult to design converter using flat magnetic component because flat transformer temperature becomes high at high switching frequency. In this paper, the design and analysis of flat transformer in LLC resonant converter for the PDP TV is proposed to reduce temperature of the transformer. In this proposed converter, flat transformer is integrated into advanced power conversion application systems. Low-profile power module of profile of about 14mm is achieved. Temperature inside of transformer repressed to 71°C and an overall efficiency of about 96.6% was obtained. © 2010 IEEE.

DOI： 10.1109/IPEC.2010.5542242

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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）

Recently, DC power supply systems have been widely viewed as an energy-saving solution. The protection of the system from over current is one of the most important factors in DC power supply system. This paper presents malfunction mechanism of a semiconductor circuit breaker. © 2010 IEEE.

DOI： 10.1109/IPEC.2010.5542368

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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）

Recently, the performance of the DSP and FPGA is developed remarkably. So, fully digital control is enabled in switch mode power supplies. However, in many cases, the control system is built by very complicatedly and very difficult theories such as the adaptive control, predictive control, and so on. Furthermore, in most popular PID control, its design method of the parameters is not clear, so derivation of the optimal parameters is very difficult. This paper proposes revolutionary control technique which is cancelled the transfer function of the converter completely by using pole-zero-cancellation method. This technique is very simple and easy to stability design. ©2010 IEEE.

DOI： 10.1109/ICIT.2010.5472642

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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）

In this paper, a power factor correction (PFC) based on active-clamped full-wave quasi-resonant (ZCS-QR) boost converter is presented. This circuit is characterized by zero-voltage-switched (ZVS) and zero-current-switched (ZCS) that results in higher efficiency, opens possibility to incorporate higher switching frequency, and has some potency to reduce converter's conducted EMI. The working principle and steady state performance of the proposed converter are presented. A 100 V dc input, 180 W maximum output, and 440 kHz resonant frequency experimental circuit has been built. Maximum efficiency of 93% and the proof of compliance to the IEC61000-3-2 class D have been confirmed by experiment. ©2010 IEEE.

DOI： 10.1109/APEC.2010.5433697

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記述言語：英語   掲載種別：研究論文（学術雑誌）

This paper explains about basic working principles, implementation problems, and experimental results of a new power factor correction (PFC) topology. In this proposed topology, a totem-pole boost PFC circuit that works under interleaved critical-conduction-mode (CRM) condition is presented. The circuit is developed towards high efficiency, high performance, lowcost, simple control scheme, and low conducted electro magnetic interference (EMI) PFC circuit. The application is targeted toward middle power applications that normally employs continuous or non-bridgeless interleaved boost converter.

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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）

This paper proposes a new power-factor-correction (PFC) topology, and explains its operation principle, its control mechanism, related application problems followed by experimental results. In this proposed topology, critical-conduction-mode (CRM) interleaved technique is applied to a bridgeless PFC in order to achieve high efficiency by combining benefits of each topology. This application is targeted toward low to middle power applications that normally employs continuous-conductionmode boost converter. Copyright © 2010 The Institute of Electronics, Information and Communication Engineers.

DOI： 10.1587/transcom.E93.B.2250

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