A
DC–DC Converter Based on the Three-State
Switching
Cell for High Current and Voltage
Step-Down Applications
Abstract—This paper presents a pulsewidth modulation dc–dc
nonisolated buck converter using the three-state switching cell, constituted by
two active switches, two diodes, and two coupled inductors. Only part of the
load power is processed by the active switches, reducing the peak current
through the switches to half of the load current, as higher power levels can
then be achieved by the proposed topology. The volume of reactive elements,
i.e., inductors and capacitors, is also decreased since the ripple frequency of
the output voltage is twice the switching frequency. Due to the intrinsic
characteristics of the topology, total losses are distributed among all
semiconductors. Another advantage of this converter is the reduced region for
discontinuous conduction mode when compared to the conventional buck converter
or, in other words, the operation range in continuous conduction mode is
increased, as demonstrated by the static gain plot. The theoretical approach is
detailed through qualitative and quantitative analyses by the application of
the three-state switching cell to the buck converter operating in
nonoverlapping mode (D < 0.5). Besides, the mathematical analysis and
development of an experimental prototype rated at 1 kW are carried out. The
main experimental results are presented and adequately discussed to clearly
identify its claimed advantages.
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