Consideration of Electric Power Conversion Efficiency Improvement of Magnetic Oscillation Type DC-AC Converter

In a previous paper, we proposed a magnetic oscillation type dc-ac converter with sinusoidal output. An ac-voltage source is connected to an excitation winding of the magnetic circuit in series. The converter can supply electric power to the ac-voltage source because the current flowing through the ac-voltage source can be controlled by small signal-current flows through a controlled winding of the magnetic circuit according to the law of equal ampere-turns. This converter could be used in an electric-power interconnection system. This converter, however, does not have enough power conversion efficiency for practical use yet. In this paper, we present a new magnetic oscillation-type dc-ac converter with improved efficiency. The basic characteristics of the converter are described in this paper.