Reliability challenge for impedance network‐based DC‐DC
Mohammad Mehdi Haji‐Esmaeili
| Ebrahim Babaei
Faculty of Electrical and Computer
Engineering, University of Tabriz, Tabriz,
Engineering Faculty, Near East
University, 99138 Mersin 10 Nicosia,
North Cyprus, Turkey
Ebrahim Babaei, Faculty of Electrical and
Computer Engineering, University of
Tabriz, Tabriz, Iran
In this paper, reliability evaluation is proposed for some of the most famous
impedance network‐based DC‐DC boost converters. Markov reliability
approach is used to evaluate the reliability of the converters. Also, some other
factors such as components' failure rates, reliability functions, and mean time
to failures are introduced and evaluated. Detailed explanations for the evalua-
tion methods of the mentioned factors are also provided in the context of the
paper. In addition to the mathematical analysis, numerical calculations are also
done through the simulation results of the converters. Simulations are done in
PSCAD/EMTDC. Finally, a numerical and graphical reliability comparison is
provided for the mentioned converters. The purpose of this paper is to give a
comprehensive reliability evaluation and comparison for some of the most
popular impedance network‐based DC‐DC converters. In addition, this paper
gives a detailed reliability analysis that can be used in reliability assessment
of all types of power electronic converters, so it can help the researchers to
consider reliability calculations into their designing.
DC‐DC converters, impedance networks, reliability evaluation
1 | INTRODUCTION
Direct current to direct current (DC‐DC) converters play an important role in many industrial applications such as
distributed generation resources, renewable energy systems, unified power factor correction, hybrid electrical vehicles,
and high‐voltage DC.
Their increasing and extensive use in many applications challenge the reliability of systems.
In some critical and sensitive industrial applications with safety‐aspect concern and high standstill cost, high reliability
of the system is very important.
Nevertheless, DC‐DC converters have a high possibility of defection according to the current and voltage stresses that
Failure of a component in the converter causes the abnormal operation of other devices. So the
shutdown is required to prevent further damages. Therefore, 1 component failure can lead the whole system to fail,
and reliability of a DC‐DC converter can challenge the reliability of the whole system.
Considering the previous content, in applications with specified voltage gain, choosing a DC‐DC converter with
higher reliability can guarantee a longer lifetime and mean time to failure (MTTF) of the system and reduce the related
concerns about the system's downtime. This led to the creation of a new field in researches, and reliability evaluation of
power electronic converters was considered in recent years.
Received: 14 April 2017 Revised: 17 July 2017 Accepted: 28 August 2017
Int J Circ Theor Appl. 2018;46:581–598. Copyright © 2017 John Wiley & Sons, Ltd.wileyonlinelibrary.com/journal/cta 581