Abstract
In this paper, a high step-up dc-dc converter is presented. The proposed converter features a with high voltage conversion ratio and high efficiency with a reasonable duty cycle by adopting an active switched inductor and a coupled inductor. The voltage stresses on the power switches are lower, and with the energy stored in the leakage inductor being recycled, its efficiency is improved. Moreover, current stresses of the power switches are greatly reduced as caused by inductors parallel charging and series discharging on the active switched inductor. Loss analyses of its components are also presented. A comparison including component counts, voltage gain and voltage stresses of power switches with other relevant converters are analyzed. Eventually, a laboratory prototype with an input voltage of 24 V-36 V and an output voltage of 400 V with 400 W rated power is implemented to validate the correctness and effectiveness of the theoretical analyses.
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