Hybrid structures of buck DC-DC converters, using commutated capacitors or inductors, in order to obtain a higher step-down ratio, were presented in the literature. The paper is focused on a comparative study of classical buck converter (BDC) and a hybrid buck "switched inductor" DC-DC converter (HBDC), in continuous conduction mode (CCM), and at the boundary (BCM) between CCM and discontinuous conduction mode (DCM). Analytical aspects and digital simulations, validated by experimental results, obtained using a laboratory prototype, are presented for this purpose.
The paper presents a high voltage conversion ratio DC-DC step-down topology obtained from a classical buck converter associated with an input switched-capacitor cell and an output switched-inductor cell. Analytical descriptions, the voltage and current limits of the main components are synthesized in a comparative form, related to the classical buck structure, in order to emphasis the advantages of the proposed converter. Digital simulations and experimental results obtained with a built prototype are compared. From the first evaluation, the proposed converter is expected to be effectively used at input to output voltage ratios higher than 20.
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