Research Journal of Engineering Sciences ___________________________________________ ISSN 2278 – 9472Vol. 2(6), 52-53., June (2013) Res. J. Engineering Sci. International Science Congress Association 52 Mini Review Paper Miscellaneous applications of DC-DC converters Verma Sujata and Singh S.K.NIELIT, Gorakhpur, UP, INDIAAvailable online at: www.isca.in Received 27th May 2013, revised 5th June 2013, accepted 20th June 2013AbstractDC-DC converters are majorly used for various purposes in power electronics. In literature various attempt has been done to improve topology of various kind of dc-dc converters. DC-DC converter are using for various application in different fields of power electronics. The aim of this paper is to present some miscellaneous application of dc-dc converters in telecommunication, photovoltaic cell, renewable energy sources and SiC devices and arc welding.Keywords:DC-DC converter, Telecommunication, renewable energy. Introduction DC-DC converters are the power circuits that convert direct current voltage from one level to other. These converters act as switching converters. Topology of DC-DC converters varies according to their application. DC-DC converters used in portable devices to aircraft power system. So the applications of these converters play important role in power electronics1-3. DC-DC converters in telecommunication There are two options for the implementation of high efficiency isolated dc-dc converters with high output voltage for TWTA were proposed and studied4, 5. In this paper they created two operation stages for to develop efficient circuits (figure.1 and 2). Similarly there is some photovoltaic DC-DC converters used for telecommunication. Figure-1 First operation stage (t-t) Figure-2 Second operation stage (t-tHybrid Electrical Vehicles In hybrid electrical vehicles isolated bidirectional dc-dc converters (IBDC) are used to improved the efficiency of these equipmentTransformer play important role in providing isolation in these types of bidirectional DC-DC converters. Similarly Three-level bi-directional DC-DC converters have been investigated for charge station application. DC-DC converters in photovoltaic application: Important components of photovoltaic cells are DC/DC and/or DC/AC converters, energy storage and control systems and control-measuring devices. DC/DC and DC/AC converters, these two components are a main part of a network-connected photovoltaic system. The main function of the converter is to increase the inverter DC voltage and convert the DC to AC domain7, 8 Research Journal of Engineering Sciences ___________ Vol. 2(6), 52-53, June (2013) International Science Congress Association Use of DC-DC converters in SiC devices In literature there are various approaches where attempt has been taken to exploit properties of dc- dc converters to make SiC devices. Bidirectional DC- DC converter based on high voltage SiC JFETs for a 1MW next-generation back- to distribution system is presented and its analysis with comparison to a conventional Si system (fig ure Figure-3 SiC high voltage DC- DC converter DC-DC Converter foe arc welding Pulse-shifted pulse width modulation (PS- PWM) can be used in combination of soft- switching to the secondary side of high frequency transformer shown by Jaroslave (2006) paper they explain how IGBT transistors can be fit and seems suitable with full bridge inverter and output power controlled by rectifier made up of two snap- off diodes one by one in series with MOSFET transistors. It is also connected on secondary side of high-frequency power transfo rmer. This topology can is helpful to achieve soft- switching operation under low commutating current (figure-4)10. Figure-4 Scheme for DC- DC converter for arc welding ___________ ________________________________ ______ International Science Congress Association converters in SiC devices In literature there are various approaches where attempt has dc converters to make SiC DC converter based on high voltage to -back system of a distribution system is presented and its analysis with ure -3). DC converter PWM) can be used in switching to the secondary side of high frequency transformer shown by Jaroslave (2006) 10. In this transistors can be fit and seems suitable with full bridge inverter and output power controlled by off diodes one by one in series with MOSFET transistors. It is also connected on secondary rmer. This topology can is switching operation under low DC converter for arc welding Conclusion In this review article we have discussed some specific role of DC- DC conve rters in area of telecommunication, hybrid electrical vehicle, SiC devices and arc welding. 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