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Nishi-Tokyo-shi, Japan

Merstech Inc. | Date: 2011-01-14

A protected power conversion device (

MERSTech Inc. | Date: 2010-10-08

A power conversion device (

Isobe T.,University of Tsukuba | Shiojima D.,Tokyo Institute of Technology | Kato K.,MERSTech Co. | Hernandez Y.R.R.,MERSTech Co. | Shimada R.,Tokyo Institute of Technology
IEEE Transactions on Power Electronics | Year: 2016

This paper discusses reactive power compensators from the point of stored energy in the capacitor, and proposes a single-phase full-bridge configuration of semiconductor switches to be used with reduced equipped capacitance for reactive power compensation. By applying this concept to shunt-type static var compensator, a static synchronous compensator can be achieved with reduced-sized capacitor. Additionally, the switching loss can be reduced due to its distinctive capacitor voltage waveform, which swings at the double of the line frequency. Modulation technique and capacitor voltage control method based on the reduced capacitance and high-voltage ripple in the capacitor are proposed. The concept and control method were confirmed with small-scale experiments. © 1986-2012 IEEE. Source

Isobe T.,Tokyo Institute of Technology | Kato K.,MERSTech Co. | Kojima N.,MERSTech Co. | Shimada R.,Tokyo Institute of Technology
15th International Power Electronics and Motion Control Conference and Exposition, EPE-PEMC 2012 ECCE Europe | Year: 2012

This paper proposes a new single-phase DC/AC converter topology with soft-switching operation. This converter achieves soft-switching by using DCM (discontinuous current mode) operation and a MERS based turn-off snubber topology. The DCM operation realizes zero-current turnon and the MERS snubber topology achieves zero-voltage turn-off. The proposed converter offers bi-directional power flow single-phase DC/AC conversion with soft-switching; therefore, it is attractive for grid-connecting converter for domestic renewable energy and energy storage, including PVs (Photovoltaic) and battery energy storage devices. This paper describes operation principle, control and modulation technique for this converter, and experimental verification including loss analysis with a 1-kW pilot device. © 2012 IEEE. Source

Isobe T.,Tokyo Institute of Technology | Kato K.,MERSTech Co. | Kojima N.,MERSTech Co. | Shimada R.,Tokyo Institute of Technology
IEEJ Transactions on Industry Applications | Year: 2013

With an increase in renewable energy source installations in the domestic field, bidirectional ac/dc converters are attracting attention. Efficiency, power density improvement and EMI reduction are necessary for converters in this field. Using high-frequency switching can reduce the size of passive components and help achieve a high-powerdensity converter; however, the switching losses and EMI can increase. In this study, we propose a new bidirectional ac/dc converter circuit topology that can reduce the switching losses and EMI with a soft-switching operation. The soft-switching operation is based on the DCM (discontinuous current mode) operation and a MERS (magnetic energy recovery switch)-type turn-off snubber. This paper focuses on a modulation technique applied to this converter. Experiments with a fabricated 1kW converter were conducted, and the principles of operation were confirmed. Loss analysis indicates that inductor design is the key design issue for the proposed converter. © 2014 The Institute of Electrical Engineers of Japan. Source

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