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Abstract
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This study proposes a bidirectional DC–DC converter with low voltage stress on its semi-
conductor elements and high voltage gain. Bidirectional DC–DC converters play a crucial
role in DC microgrid systems, and they have been used for many applications such as
power flow management, battery storage systems, voltage regulation, and electric vehicle
(EV) charging systems. This paper proposes a novel non-isolated, bidirectional DC–DC
converter with an improved voltage gain conversion ratio. In the structure of the proposed
converter, the coupled inductor provides high voltage gain and is employed to reduce the
overall voltage stress across the main switches. Additionally, a filter inductor on the input-
low voltage side of the converter reduces current ripple. In addition, a single switch is used
in boost mode, which simplifies control of the converter. Furthermore, two power switches
receive simultaneous pulses for adjusting the buck stage voltage gain. Also, in the follow-
ing, the mathematical calculations and the small signal analysis for the proposed converter
are provided. Furthermore, a 200 W prototype is finally implemented, and its results are
validated by the theoretical analysis.
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