Operation and Control Design of New Three-phase and Single-phase DC/AC inverters with Reduced Number of Switches

Inverters with reduced number of switches have been proposed in the literature to improve the capability of cost reduction, total inverters size and switching losses of dc/ac inverter topologies. In addition, they have a lower probability of damaging the semi-conductor switches as well as lower commonmode currents. This paper proposes new designs for inverters with reduced number of switches. For three-phase systems, the proposed inverters use four switches instead of six in the traditional three-phase Voltage Source Inverter (VSI). Compared to the traditional Four-switch three-phase (FSTP) inverter, the proposed FSTP inverters improve the voltage utilization factor of the input dc supply. Classical controllers as well as sliding mode controller are used to discuss the dynamic response and robustness of the inverters. In addition, the paper presents new single-phase inverters with two switches instead of four in the traditional VSI. The capability of suppressing the 2 order current harmonic from the input dc side is discussed. Equations explaining the control design, switches ratings, and the operation of the proposed inverters are presented in this paper. The basic structure, control design, and MATLAB/SIMULINK results are presented. Practical results substantiate the design flexibility of the proposed topologies when controlled by a TMSF280335 DSP. Keywords-component; dc/ac inverters; sliding mode controllers; PR controllers; Four-switch three-phase inverter (FSTP)