Power Loss Analysis of Symmetrical Multilevel Boost Converter and Three-Level Boost Converter Compared to Classic Boost Converter

This paper investigates power losses of three boost converters-Symmetrical multilevel boost converter, three-level boost converter, and classic boost converter. The three converters are designed and simulated under the same specifications. Moreover, to ensure performance comparison, power losses are determined by referring to simulation data results and parameters of the devices provided by the manufacturer’s data sheets. The selection of each component is done based on design and simulation results. The result shows that for input power with 1041.52W, a symmetrical multilevel boost converter reduces total losses by 0.020% and 2.78% respectively compared to classic boost and three-level boost converter converters. As a result, the symmetrical multilevel boost converter provides an efficiency of 97.31% while the three-level boost converter produces an efficiency of 95.69% and the classic boost converter efficiency goes to 97.29%. The symmetrical multilevel boost converter advantages consist of providing low losses for active and passive components. Symmetrical multilevel boost converter transistors (two Mosfets) switching and conduction losses represent only 0.25 and 0.09% respectively, while the transistors losses of the classical boost converter constitute 1.08%. Similarly, in a symmetrical multilevel boost converter, the inductors $\left(\mathrm{L}_{1}, \mathrm{~L}_{2}\right)$ and capacitors $\left(C_{1}, \ldots, C_{6}\right)$ power losses decrease by 0.009% and 0.24% respectively compared to the classical boost converter. With these results, a suggestion is proposed to enhance the symmetrical multilevel topology of the boost converter’s efficiency by reducing diodes losses which consist of 82% of the total power loss.