Analysis of a 4-phase tapped-inductor DC-DC converter for high boost ratio wide input voltage range applications

Detailed analysis of a 4-phase tapped-inductor boost DC-DC converter operating in continuous conduction mode is presented. Expressions needed to evaluate converter performance are derived. These are then used to plot input- and output-side current ripple characteristics. It is shown that input-and output-side ripple vary in proportion and the converter operates with low ripple over certain ranges of duty ratio. The performance of a 1-phase converter is seen to represent the worst-case scenario for 3- and 4-phase converters. For a given per-unit load and type of snubber, 1- and 4-phase converter efficiencies are identical. Converter is suitable for applications with wide input voltage range, requiring low input- and output-side ripple, high efficiency and boost ratios. Theoretically derived characteristics are validated through simulations and there is good agreement between analytical and simulation results.