In this study, an interleaved soft switching boost converter suitable for high step-up applications is proposed. Zero voltage switching and zero current switching characteristics could be provided for main switches and main diodes, simultaneously. Also, the auxiliary semiconductors can achieve soft switching. Since all the utilised diodes operate under softswitching conditions, the diodes reverse recovery problem is perfectly alleviated. Due to the unique operation of the proposed topology, the converter is controlled by variant switching frequency and high voltage ratios can be achieved. Further, the precise theoretical analyses and design procedure of the converter have been investigated utterly. Finally, according to the designed characteristics, a laboratory prototype with 60 V input voltage and 300 V output voltage is built and tested, which is in agreement with theoretical analyses.

In this paper, a switched-capacitor multilevel inverter with voltage boosting and common-mode-voltage reduction capabilities is put forth. The proposed inverter is synthesized with one-half bridge and several switched-capacitor cells. Due to the voltage boosting and common-mode current reduction features, the proposed multilevel inverter is suitable for grid-connected PV applications. In addition, an analytical lifetime evaluation based on mission profile of the proposed inverter has been presented to derive lifetime distribution of semiconductors. Whereas in the proposed inverter, any components failure can bring the whole system to a shutdown. The series reliability model is used to estimate the lifetime of the overall system. The performance of the suggested multilevel inverter in grid-connected applications is verified through the simulation results using the grid-tied model in Matlab/Simulink. Moreover, the viability and feasibility of the presented inverter are proven by using a one kW lab-scaled prototype.

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