Overview of modulation techniques for the four-switch converter topology

Because of a lot of advantages, there are extensive motivations to utilize four-switch converters in industrial applications. Many modulation techniques have been proposed to design a good four-switch converter that is less sensitive to DC link voltage fluctuations, and have low AC currents THD and at the same time low distortion in the uncontrolled phase. Among various techniques, design procedure and advantages and disadvantages of three most used methods namely; hysteresis band current control, sinusoidal PWM, and space vector modulation are discussed. In order to have clear and effective comparison, simulation results have been provided and given in this paper.