Jun‐ichi Itoh
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View article: Carrier Synchronization Method using High-Speed Sampling for Parallel Inverters without Communication
Carrier Synchronization Method using High-Speed Sampling for Parallel Inverters without Communication Open
This paper proposes a novel carrier- synchronized control method for the parallel operation of two inverters using high-speed sampling. The proposed method focuses on the active power component at the switching frequency. When carrier sync…
View article: Implementation Method of Inverter Circuit for Continuous Megahertz and Kilowatt Operation
Implementation Method of Inverter Circuit for Continuous Megahertz and Kilowatt Operation Open
This paper proposes an implementation and design method of a high-frequency and high-power inverter for wireless power transfer systems. The implementation and design of circuits operated in the megahertz range are complex because the infl…
View article: Improvement Method of Disturbance Suppression for Single-Phase Grid-Tied Inverter Using Semi-Open-Loop Control
Improvement Method of Disturbance Suppression for Single-Phase Grid-Tied Inverter Using Semi-Open-Loop Control Open
This paper presents a semi-open-loop control for a single-phase grid-tied inverter with voltage control. To improve the output current distortion, a disturbance observer, including an inductance value greater than the grid-tied inductance,…
View article: Intra-arm Balancing Control for Modular Multilevel Converter with Cell Loading Operated under High Power Imbalances
Intra-arm Balancing Control for Modular Multilevel Converter with Cell Loading Operated under High Power Imbalances Open
Multiport converters with a large number of ports have been explored for integrated generation units or batteries. An attractive candidate multiport converter has been developed based on the modular multilevel converter (MMC) with cell loa…
View article: Three-phase DAB-type AC-DC Converters with Nine-switch Matrix Converter
Three-phase DAB-type AC-DC Converters with Nine-switch Matrix Converter Open
This paper proposes an isolated AC-DC converter combining a three-phase DAB converter and a nine-switch matrix converter. The proposed circuit simultaneously achieves high efficiency due to the three-phase DAB converter and miniaturization…
View article: Hybrid Modulation Method of PWM and Square-Wave Operation for Single-Phase Solid-State Transformer with ISOP Connection
Hybrid Modulation Method of PWM and Square-Wave Operation for Single-Phase Solid-State Transformer with ISOP Connection Open
This paper proposes a hybrid modulation for a solid-state transformer (SST) with an input-series output-parallel (ISOP) connected cells. One of the cells on the high-voltage side for power factor correction (PFC) is driven using pulse widt…
View article: Comparison of AC-Side Inductor Loss on Three-Phase Voltage-Fed Inverter with Various PWM Schemes
Comparison of AC-Side Inductor Loss on Three-Phase Voltage-Fed Inverter with Various PWM Schemes Open
In this study, the authors experimentally verify the AC-side inductor loss of the three-phase voltage-fed inverter by evaluating the core temperature. Two-phase pulse width modulation (PWM) is renowned for its low switching losses. However…
View article: Derivation and Evaluation of Transfer Function of Output Voltage to Input Voltage Amplitude in Cockcroft-Walton Circuit
Derivation and Evaluation of Transfer Function of Output Voltage to Input Voltage Amplitude in Cockcroft-Walton Circuit Open
The Cockcroft-Walton (CW) circuit is implemented in high-voltage low-current apparatuses such as electron beam irradiation devices and insulation testing devices. This study focuses on the effect of the output voltage waveform on the chang…
View article: A Power Balancing Control for Large Power Unbalance in a Modular Multilevel Multiport Converter with Phase-Disposition PWM
A Power Balancing Control for Large Power Unbalance in a Modular Multilevel Multiport Converter with Phase-Disposition PWM Open
A large-scale multiport converter based on the modular multilevel converter (MMC) architecture for charging electric vehicles (EVs) can reduce the volume and installation costs compared to those of conventional multiport converters. It has…
View article: Compensation Capability of Intra-Arm Balancing Control for a Multiport Converter based on Modular Multilevel Topology
Compensation Capability of Intra-Arm Balancing Control for a Multiport Converter based on Modular Multilevel Topology Open
Multiport converters can be achieved from the modular multilevel converter (MMC) configuration by integrating generation units or loads at the cell level. This can offer advantages in applications such as photovoltaic panels and battery st…
View article: Welding Spatter Reduction Effect Using Bipolar Interleaved Buck Converter Circuit
Welding Spatter Reduction Effect Using Bipolar Interleaved Buck Converter Circuit Open
We applied a bipolar interleaved buck converter to a welding power supply. In short-circuit transfer of arc welding, an experiment was conducted, in which the current was rapidly attenuated by a bipolar interleaved buck converter. Conseque…
View article: Online Cell Capacitance and ESR Monitoring Using Switching Frequency in a Modular Multilevel Converter
Online Cell Capacitance and ESR Monitoring Using Switching Frequency in a Modular Multilevel Converter Open
A cell capacitor is one of the most fragile components in a modular multilevel converter (MMC). Capacitance decreases and equivalent series resistance (ESR) increases, as the capacitor deteriorates. This paper proposes an online monitoring…
View article: Development of Current-Fed DAB Converter Applying Triangular Current Mode for Wide Voltage Applications
Development of Current-Fed DAB Converter Applying Triangular Current Mode for Wide Voltage Applications Open
This paper proposes a control and modulation method for a Current-Fed Dual Active Bridge (DAB) converter to improve the conversion efficiency for wide voltage range applications. The current-fed DAB converter is preferred in battery applic…
View article: Torque Control Method for Switched Reluctance Motor based on Equivalent Inductance of Magnetic Co-energy
Torque Control Method for Switched Reluctance Motor based on Equivalent Inductance of Magnetic Co-energy Open
This paper proposes a torque ripple suppression method for a switched reluctance motor (SRM) with only measurable parameters. A large third-order torque ripple is generated via a conventional method with constant dq0-axis current, which is…
View article: Power Semiconductors for An Energy-Wise Society
Power Semiconductors for An Energy-Wise Society Open
This IEC White Paper establishes the critical role that power semiconductors play in transitioning to an energy wise society. It takes an in-depth look at expected trends and opportunities, as well as the challenges surrounding the power s…
View article: Three-Phase Wireless Power Supply System Using a Matrix Converter
Three-Phase Wireless Power Supply System Using a Matrix Converter Open
This paper proposes a three-phase wireless power transfer (WPT) system with a three-phase-to-three-phase matrix converter. The proposed system directly converts power from an AC grid to high-frequency AC for WPT. The three-phase WPT system…
View article: Reduced Spatter by High Speed Current Control of Gas Shielded Arc Welding
Reduced Spatter by High Speed Current Control of Gas Shielded Arc Welding Open
Power supplies for gas shielded arc welding with high control speed are being increasingly investigated for improving the welding quality and reduce spatter. In this study, the effect of current change on droplet behavior was evaluated, wh…
View article: Input and Output Control Method Using Power Coordination for Single-phase MMC Based on USPM
Input and Output Control Method Using Power Coordination for Single-phase MMC Based on USPM Open
This paper proposes the concept of using a universal smart power module (USPM) for the modularization of power converters. The USPM realizes the main circuit, filter, and controller as one. The power conversion system is composed of a comb…
View article: Low Vibration Stopping Method for the Compressor Driving Motor
Low Vibration Stopping Method for the Compressor Driving Motor Open
This paper proposes a low vibration stopping method by switching between the free-run and short-circuit braking modes of a compressor. Vibrations are generated by the bouncing of the rotor caused by load torque fluctuations. The proposed m…
View article: A 22kW Three-phase Wireless Power Transfer System in Compliance with CISPR 11 and ICNIRP 2010
A 22kW Three-phase Wireless Power Transfer System in Compliance with CISPR 11 and ICNIRP 2010 Open
Techniques to reduce electromagnetic emission in high-power wireless power transfer (WPT) systems are required because the radiated emission of the WPT must comply with the regulation published by CISPR (International Special Committee on …
View article: Development of Multi-Port Converter with Square-Wave-Voltage Multilevel Converter and Active Power Filter Connected in Series
Development of Multi-Port Converter with Square-Wave-Voltage Multilevel Converter and Active Power Filter Connected in Series Open
This paper proposes a multi-port DC-AC converter with high efficiency and high-power density. The proposed circuit consists of a full bridge converter, a series active filter, and an unfolder circuit. The proposed circuit reduces the low s…
View article: Low Vibration Stopping Method for the Compressor Driving Motor
Low Vibration Stopping Method for the Compressor Driving Motor Open
This paper proposes a low vibration stopping method by switching between the free-run and short-circuit braking modes of a compressor. Vibrations are generated by the bouncing of the rotor caused by load torque fluctuations. The proposed m…
View article: Automatic Design Method of Typical Parameters of a Switched Reluctance Motor Focusing on Magnetic Saturation
Automatic Design Method of Typical Parameters of a Switched Reluctance Motor Focusing on Magnetic Saturation Open
This paper proposes an automatic design method of typical parameters such as number of phases, number of poles, stack thickness, stator outer diameter, rotor outer diameter, and number of turns of a switched reluctance motor from the requi…
View article: Isolated DC to Single-Phase AC Converter with Active Power Decoupling Capability Using Coupled Inductor
Isolated DC to Single-Phase AC Converter with Active Power Decoupling Capability Using Coupled Inductor Open
This paper proposes a novel active power decoupling circuit that is integrated with an interleaved boost converter for isolated DC to single-phase AC conversion applications. The proposed isolated converter consists of two full-bridge inve…
View article: Experimental Evaluation of Switched Reluctance Motor Made by Blanking Amorphous Alloy Foil
Experimental Evaluation of Switched Reluctance Motor Made by Blanking Amorphous Alloy Foil Open
This study reveals the characteristics of switched reluctance motors (SRMs) made by blanking (a) 20HX1300 of high grade low-iron-loss silicon steel (0.20mm thickness) and (b) 2605SA1 of amorphous alloy (0.025mm thickness). The blanking of …