Abstract
This paper proposes a new hybrid Ćuk-type converter employing two inductors built on the same core which can be successfully used in applications requiring an output voltage considering higher than the input one. With few components added, in the proposed converter the static conversion ratio can be easily extended becoming wider compared to the classical Ćuk topology. At the same duty cycle range the output voltage is higher than in the classical Ćuk converter. The output voltage remains with negative polarity and with a reduced ripple. An advantage of the new converter is given by its two degrees of freedom. A DC and AC analysis is carried out, device stresses are evaluated and a comparative analysis of the proposed hybrid Ćuk topology to other indirect converters has also been performed. All the equations necessary for designing the converter are provided. The simulations performed together with the practical experiments carried out, all results confirm that the theoretical considerations are correct and validate the features that the proposed converter can provide a higher static conversion ratio without operating at high duty cycles.
Highlights
Dc-dc converters are used in a large variety of applications: unidirectional and bidirectional chargers in automotive, renewable energies in photovoltaic cells for example, dc grids, cellphones, computers, laptops and so forth
(6) IL3, For calculating the dc magnetizing inductor the charge balance principle related to the capacitor C and CO is invoked: From (6), the duty cycle can be expressed in terms of static conversion ratio as:
In order to check the validity of the theoretical considerations in case of the ideal hybrid Ćuk converter, a set of simulation in Caspoc [35] tool were performed
Summary
Dc-dc converters are used in a large variety of applications: unidirectional and bidirectional chargers in automotive, renewable energies in photovoltaic cells for example, dc grids, cellphones, computers, laptops and so forth These power circuits should be able to step-up [1,2,3,4,5,6,7,8,9], step-down [10,11,12,13]. It even has the advantage of a reduced number of components and simplicity; control is sometimes difficult because its transistor is floating Another step-up/step-down structure it is the classical Ćuk converter [32]. This topology can be used with coupled [32] or uncoupled inductors [31]. [24,28], it is shown coupling theadditional inductors classical converter
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