A new topology for nonisolated multiport zero voltage
switching dc‐dc converter
| Zahra Saadatizadeh
| Pedram Chavoshipour Heris
Faculty of Electrical and Computer
Engineering, University of Tabriz, Tabriz,
Engineering Faculty, Near East
University, 99138, Nicosia, North Cyprus
Mersin 10, Turkey
Ebrahim Babaei, Faculty of Electrical and
Computer Engineering, University of
Tabriz, Tabriz, Iran.
In this paper, a new multiport zero voltage switching dc‐dc converter is proposed.
Multiport dc‐dc converters are widely applicable in hybrid energy generating sys-
tems to provide substantial power to sensitive loads. The proposed topology can
operate in 3 operational modes of boost, buck, and buck‐boost. Moreover, it
has zero voltage switching operation for all switches and has the ability to elim-
inate the input current ripple; also, at low voltage side, the input sources can be
extended. In addition, it has the ability of interfacing 3 different voltages only by
using 3 switches. In this paper, the proposed topology is analyzed theoretically for
all operating modes; besides, the voltage and current equations of all components
are calculated. Furthermore, the required soft switching and zero input currents
ripple conditions are analyzed. Finally, to demonstrate the accurate performance
of the proposed converter, the Power System Computer Aided Design(PSCAD)/
Electro Magnetic Transient Design and Control(EMTDC) simulation and exper-
imental results are extracted and presented.
input current ripple cancellation, nonisolated multiport dc‐dc converter, soft switching, zero voltage
1 | INTRODUCTION
Nowadays, the multiport nonisolated dc‐dc converters have gotten more attentions in different power electronic appli-
cations, such as in hybrid photovoltaic (PV) and battery systems, to provide a dependable power. In addition, in conven-
tional hybrid systems of PV arrays and battery, there must be 2 converters used that would increase the size and cost of
the unit, but multiport converters are able to provide better performance with less number of components.
because of multi‐output capability of the multiport converters, they can be used in electric vehicles, in which several
power supplies would be needed.
There are several multiport dc‐dc converters presented in recent years. In Marchesoni
a nonisolated 3‐port dc‐dc converter is presented. This converter has applied 3 switches to interface 3 differ-
ent values of voltages. However, all switches operate under hard switching condition, and there are considerable current
ripples at input sources. A multi‐input/multi‐output converter based on switched‐capacitor cells is introduced in Babaei
for PV or fuel cell applications. In this converter, the switched‐capacitor modules have to be operated at
high switching frequency; consequently, the switching losses would be increased. In previous studies,
dc‐dc converters with soft switching capabilities that are suitable for electric vehicle applications are presented. However,
these converters can only be operated in boost mode, and they suffer from high input current ripples. The nonisolated
converters have lower losses in comparison to isolated converters.
Some multiport converters are presented in
Received: 23 May 2017 Revised: 11 December 2017 Accepted: 22 December 2017
1204 Copyright © 2018 John Wiley & Sons, Ltd. Int J Circ Theor Appl. 2018;46:1204–1227.wileyonlinelibrary.com/journal/cta