An Optimized Switching Patterns for Reducing a Switching Loss of a Matrix Converter Under Any Power Factor Conditions

This paper proposes an optimum switching patterns of a matrix converter for reducing switching loss under various input power factors and load power factors. Matrix converter has 27 switching states and several switching states are chosen in order to control an output voltage and an input current at the same time. When the matrix converter selects 4 switching states, there are 1278 switching patterns totally. By using these 1278 patterns, the matrix converter can reduce an input current distortion or an output voltage distortion. In addition, the matrix converter can reduce switching loss. However, the control scheme of the matrix converter reducing switching loss. This paper discusses optimized switching patterns for reducing an output voltage distortion, an input current distortion, or switching loss when a modulation index, input power factor and load power factor are changed. The output voltage and input current distortion are evaluated by an instantaneous effective values theory. In addition, this paper introduces a switching loss coefficient in order to reduce the switching loss. By using this coefficient, this paper demonstrates minimization results of the switching loss by theoretical simulation.