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A Five-Level Switched-Capacitor Boosting Inverter With Reduced Switch Current Stress

A new step-up five-level (5L) inverter based on switched-capacitor (SC) technique is presented in this paper. It employs eight switches, two diodes, one capacitor and an inductor for 5L voltage generation. In general, SC charging results in high magnitude successive current spikes which is harmful for the capacitor, switch and also dc source. In the proposed topology, this issue is eliminated by using an inductor in the charging loop which is placed in a way to not intervene in the voltage level generation process and only reduces the current spikes. The topology has an ability to self-balance its SC voltage thereby requiring no sensors. A detailed comparative study is presented to assess the proposed topology in terms of number of components and ability to curtail the capacitive current spikes. The simulation results are presented to affirm the operability and feasibility, under different conditions.