Single-pulse operation for a Matrix converter synchronized with the output frequency

This paper proposes a single-pulse operation control for Matrix converters where the single-pulse operation is controlled to synchronize with the output frequency. There are two known problems for the synchronize control; firstly, the beat-frequency components occurs in the output current, and secondly, the input power factor should be controlled as unity. To solve these problems, this paper proposes a beat-less control with unity power factor control. Additionally, the voltage transfer ratio is improved to 0.955 in the high-frequency output. Furthermore, a transfer control, which control from the asynchronous PWM to the proposed single-pulse control, is proposed. The fundamental operations are confirmed by the experimental results. The beat current is suppressed from 4% to approximately 1% by using the proposed control. The experimental results demonstrate sinusoidal input current waveforms and a unity input power factor. Additionally, a maximum efficiency of 96.4 % is achieved at 1.34-kW load.