Three-phase DAB-type AC-DC Converters with Nine-switch Matrix Converter

Abstract

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 due to the matrix converter. In addition, this paper introduces synchronous PWM control to reduce the switching frequency of the matrix converter. The switching frequency of the proposed method is reduced to 44% compared with that of the conventional method. The experimental results for the 1kW-system demonstrate a maximum efficiency of 96.8% and a system current total harmonic distortion of 1.54% at the rated load. Moreover, the results indicate an efficiency improvement of 3.1% over that of conventional circuits and 0.8% over that of the virtual AC/DC/AC transmission method.