Research on Linear Output Voltage Transfer Ratio for Ultrasparse Matrix Converter

Many existing research works of ultrasparse matrix converter (USMC) show that the maximum linear output voltage transfer ratio (MLO-VTR) is less than 0.866, however, this paper proves that based on space vector modulation, MLO-VTR for USMC can break the ultimate value. First, based on the condition that input power factor is one, the maximum output voltage within one carrier period and the maximum linear output voltage are derived. Further, the mathematical equations among MLO-VTR, the output/input frequency ratios, and the output voltage initial phase are also derived. After that, by solving the operating limits of the mathematical relationship of the MLO-VTR, we can obtain the maximum value of MLO-VTR under different output/input frequency ratios which can be more than 0.866. Finally, all of theoretical derivations are verified by experiments.