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A new multi-input non-isolated DC/DC converter with high-voltage transfer gain is proposed in this study. The presented converter consists of the conventional buck-boost and boost converters. All the stages except the last stage are buck-boost converters. The last stage is the conventional boost converter. The proposed multi-input high-voltage gain converter benefits from various advantages such as reduced semiconductor current stress, no limitation for switching duty cycle and wide control range of different input powers. The presented converter can even operate when one or some power input fail to provide energy to the load. The steady-state operation and dynamic modelling of the suggested converter are analysed thoroughly. Experimental results are also provided to verify the feasibility of the presented converter.

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In this study, a new topology of semi-cascaded multilevel inverter is proposed which is a proper alternative to be used in medium voltage applications. This structure consists of series connected sub-multilevel inverters blocks. The proposed topology is based on the connections of several cell units in an appropriate scheme with the help of six power switches. Compared to the traditional cascaded multilevel inverter, in suggested topology the number of switches, inverter cost and installation area are reduced significantly. Also, in comparison with semi-cascaded multilevel inverter, the proposed inverter works with lower total peak inverse voltage. The proposed inverter is able to be used as an asymmetrical inverter. To verify the operation and good performance of the proposed inverter the simulation and experimental results are obtained.

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In this study, a novel buck-boost DC/DC converter is presented. The circuit structure of the proposed converter consists of a single power switch, two diodes and some energy storage elements. Employing only a single power switch reduces the implementation cost and switching power losses. The proposed converter has higher voltage gain in step-up mode in comparison with conventional buck-boost and Cuk converter. In addition, this converter expands the continuous conduction mode (CCM) operational region. The presented converter has three operation modes in CCM. The second mode reduces the voltage stresses across the capacitors. Therefore the current stresses on diodes are also reduced. To verify the operation of the proposed converter, the experimental results are provided using a hardware prototype.