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829 International Journal of Emerging Technology & Research Volume 1, Issue 4, May-June, 2014 (www.ijetr.org) ISSN (E): 2347-5900 ISSN (P): 2347-6079 High Efficiency Single Input Triple Output Dc-Dc Converter Kamala Chindhu.M1, Belcy Jenifer.J2, Sangeetha.P3 1, 2, 3 PG Student, Department of Electrical and Electronics Engineering, Loyola Institute Of Technology, Chennai Abstract-In this paper, a single input triple output DCDC converter is designed and developed using coupled inductor. Portable applications require multiple outputs with different output levels. This converter boosts the low-voltage input power source to a controllable high-voltage dc bus, middle-voltage output terminals and inverted output terminal. The controllable high voltage dc terminal can be used as active front terminal of a DC-AC converter (inverter) and also used as the main power source for high voltage DC load. Middle voltage output terminal can be used for charging battery modules and also can be used for individual middle voltage DC loads. Some applications require negative outputs. Coupled inductor based DC-DC converter gives high efficiency power conversion, various output voltages with different levels and high step up ratio. Simulation of proposed converter is done and results obtained are satisfactory. Keywords: DC-DC converter, coupled inductor, single input triple output converter, high efficiency conversion power 1. INTRODUCTION Portable devices are made of various sub modules that can provide several functions like Liquid crystal display (LCD), Light Emitting Diode(LED) backlight and various utilities. These applications require step-up, step-down and bipolar supplies. Power management design comprises boost to step-up, buck to step-down and buck-boost for negative supply. Some of the works are capable of delivering buck and boost outputs along with inverted outputs. Various voltage levels are also used in power converters of an FC generation. Several studies have been carried out in Single input multiple output with different voltage gains and are combined to satisfy the requirements of various voltage © Copyright reserved by IJETR levels so that the system control is complicated and cost is more. The main aim of this study is to design a single input triple output converter with increased conversion efficiency, high step up ratio, saving the manufacturing cost. A SIMO converter was investigated with two outputs from a single input using single switch [1]. The multiple output dc-dc converter uses the soft switching technique and reduces switching losses but it is more complicated because of the three full-bridge converter [2]. A new multi output dc-dc converter has been designed which can share its output between different series of output voltages for low and high power applications [3].A SIMO converter is designed which is capable of generating buck, boost and inverted outputs simultaneously but it is applicable only for low power application and more than one switch for one output is used [4]. This newly designed SITO converter with coupled inductor uses three power switches to achieve the objectives of high efficiency power conversion, high stepup ratio and different output voltage levels. Auxillary inductors are designed in order to adjust the middle voltage output terminals, and the output voltages of high voltage dc bus is controlled by proportional integral control. This converter study is organized into five sections. First is introduction in section I, SITO converter design is given in the section II, circuit operation in section III, simulation studies in section IV, results and discussion in section V and conclusion in section V. The text must be in English. Authors whose English language is not their own are certainly requested to have their manuscripts checked (or co-authored) by an English native speaker, for linguistic correctness before submission and in its final version, if changes had been made to the initial version. The submitted typeset scripts of each contribution must be in their final form and of good appearance because they will be printed directly. The (Impact Factor: 0.997) 829 International Journal of Emerging Technology & Research (www.ijetr.org) ISSN (E): 2347-5900 ISSN (P): 2347-6079 Volume 1, Issue 4, May-June, 2014 document you are reading is written in the format that should be used in your paper. 3. CIRCUIT OPERATION 3.1 Operating Modes 2. NEW CONVERTER DESIGN 1) Mode 1(t0-t1) The circuit diagram of proposed SITO converter is shown in Fig.1.This SITO converter consists of five parts including low voltage side circuit(LVSC), an auxillary circuit, a middle-voltage circuit, a high voltage side circuit(HVSC) and an inverted circuit. The symbols represented in the diagram are given below. Vin and V01 denotes the voltages of the input power source and the low voltage side output load and the auxillary circuit. iin and i01 are the currents of input and low voltage side circuit and auxillary circuit.V02 and i02 are the output voltage and current in the high voltage side circuit. Cin,C01,C02 and C04 are the filter capacitors at the low voltage side circuit, the auxillary circuit, high voltage side circuit and the inverted circuit.C1 and C2 are the low voltage and high voltage side capacitors .Lp and Ls are the primary and secondary inductors of coupled inductor Tr. Primary side inductor is connected to the low voltage side and Laux is the auxillary circuit inductor.R01, R02 and R03 are the output voltages of auxillary circuit, high voltage side circuit and inverted circuit. The main switch is represented as S in the low voltage side and S1 and S2 are the switches in inverted circuit. In this mode the switch S turned ON . the diode D3 is also turned ON with the positive polarity of the coupled inductor causing capacitor C2 to get charged by secondary current. while Laux releases the charge completely causing diode D2 to turn OFF completing the mode. Also when switch S1 is ON and switch S2 is OFF the diode D6 is forward biased thus charging capacitor C3. 2)Mode 2(t1-t2)[Fig.3] In this mode the switch S is turned ON continuously causing the primary inductor to be charged by input source and by the magnetizing current ILmp. At the same time, the voltage capacitor C2 is charged by secondary voltage through the diode D3. while Laux releases the charge completely causing diode D2 to turn OFF completing the mode. Also when switch S1 is ON and switch S2 is OFF the diode D6 is forward biased thus charging capacitor C3. 3)Mode 3(t2-t3)[Fig.4] With switch S turned OFF , the secondary voltage continues to charge the capacitor C2 through diode D3.the diode D1 is turned ON when the voltage across the switch S is greater than the voltage across capacitor C1 thus charging capacitor C1.at the same time the diode D2 conducts when the partial energy is transferred to auxillary inductor from primary inductor Lkp causing the current to pass through diode D2 to the hvsc load. Also when the coupled inductor releases it energy completely the diode D3 is turned OFF and switch S1 is turned ON and Switch S2 is turned OFF thus causing diode D6 to be forward biased charging capacitor C3. 4)Mode 4(t3-t4)[Fig.5] With switch S turned OFF , a secondary current is induced in reverse to flow through diode D4 to HVSC from magnetizing inductor and also partial energy of the leakage inductor is transmitted to auxillary inductor causing D2 to conduct supplying power to the output in auxillary circuit. By keeping switch S1 is turned OFF and switch S2 is turned ON causing diode D5 to conduct charging capacitor C2 and supplies power to inverter load. Fig.1 System configuration of Single input triple output DC-DC converter © Copyright reserved by IJETR 5)Mode 5(t4-t5)[Fig.6] With switch S turned OFF, diode D1 turns OFF because iLkp equals to the auxillary current. The input power, primary winding of the transformer and the auxillary inductor connected in series to supply the power to the auxillary output through D2.At the same time, input power (Impact Factor: 0.997) 830 International Journal of Emerging Technology & Research (www.ijetr.org) ISSN (E): 2347-5900 ISSN (P): 2347-6079 Volume 1, Issue 4, May-June, 2014 source, secondary winding of the transformer, the capacitor C1, C2 connected in series to supply energy to HVSC through D4. By keeping switch S1 is turned OFF and switch S2 is turned ON causing diode D5 to conduct charging capacitor C2 and supplies power to inverter load. 6)Mode 6(t5-t6)[Fig.7]: With switch S turned ON , The Diode D2, capacitor C1, secondary winding of the coupled inductor, middle voltage capacitor C2 connected in series to release the energy into HVSC through the diode D4 causing Laux to release its energy through the diode D2. Also switch S1 is turned OFF and switch S2 is turned ON causing diode D5 to conduct and charge capacitor C2 and supplying power to the inverted load. The main switch S is turned On and the coupled inductor is charged by the input power source and when the switch is turned OFF, the coupled inductor releases its stored energy to the auxillary circuit. Figure.4 Mode 3 Figure.5 Mode 4 Figure.2 Mode 1 Figure.6 Mode 5 Figure.3 Mode 2 © Copyright reserved by IJETR (Impact Factor: 0.997) 831 International Journal of Emerging Technology & Research Volume 1, Issue 4, May-June, 2014 (www.ijetr.org) ISSN (E): 2347-5900 ISSN (P): 2347-6079 Figure.7 Mode 6 The main switch S is turned On and the coupled inductor is charged by the input power source and when the switch is turned OFF, the coupled inductor releases its stored energy to the auxillary circuit. auxillary circuit output is used for charging auxillary power sources like batteries. The high voltage side circuit gives an output of 200V which is used as an active front terminal of a dc-ac inverter is given in Fig.9(c). Figure.9 Input and output voltages 4. SIMULATION STUDIES It can also be taken as the main power source for a high voltage dc bus. The inverted side circuit gives an output of -170V in Fig.9(d). Table I INPUT AND OUTPUT VOLTAGES Input voltage 12V Auxillary circuit output 24V HVSC output 200V Inverted circuit output 170V Figure.8 Simulation circuit 6. CONCLUSION On the basis of obtained design, simulation results are carried out. The voltage is measured across the low voltage side, auxillary circuit , high voltage side and inverted side circuit. Capacitors are added across each load for filtering purpose. The output voltage gets boosted by charging the coupled inductors and auxillary inductor 5. RESULTS AND DISCUSSIONS The simulated input and output voltages are given below. From the results three output voltages are obtained from a single input with a switching frequency of 100kHz. 12V is given as input for the SITO converter which is shown in the Fig.9(a) A single input is given to the circuit and three outputs are achieved. Fig.9(b)shows the auxillary circuit output of 24V boosted by the coupled inductor. This This study has successfully developed a high-efficiency SITO dc–dc converter, and this coupled-inductor-based converter was applied well to a single-input power source plus three output terminals composed of an auxiliary battery module, a high-voltage dc bus and inverted output. The major scientific contributions of the proposed SITO converter are as follows: 1) this topology uses single input to achieve the objective of high-efficiency power conversion; 2) an auxiliary inductor is designed for providing the charge power to the auxiliary battery. The high-efficiency SITO converter topology provides designers with an alternative choice for boosting a lowvoltage power source to multiple outputs with different voltage levels efficiently. It is not appropriate to be used as the active front for DCAC multilevel inverters. So future work is to design it as a front terminal for DC-AC multilevel inverters. REFERENCES [1] Rong-Jong Wai and Kun-Huai Jheng,”HighEfficiency Single-Input C-DC Converter,” IEEE Trans.Power Electron., vol.28,no.2, pp.886-898 ,Feb 2013 © Copyright reserved by IJETR (Impact Factor: 0.997) 832 International Journal of Emerging Technology & Research (www.ijetr.org) ISSN (E): 2347-5900 ISSN (P): 2347-6079 Volume 1, Issue 4, May-June, 2014 [2] Y. Chen, Y. Kang, S. Nie, and X. Pei, “The multipleoutput DC–DC converter with shared ZCS lagging leg,” IEEE Trans. Power Electron., vol. 26, no. 8, pp. 2278–2294, Aug. 2011. [3] A. Nami, F. Zare, A. Ghosh, and F. Blaabjerg, “Multiple-output DC–DC converters based on diodeclamped converters configuration: Topology and control strategy,” IEEE Power Electron., vol. 3, no. 2, pp. 197–208,2010. [4] P. Patra, A. Patra, and N. Misra, “A single-inductor multiple-output switcher with simultaneous buck, boost and inverted outputs,” IEEE Trans. Power Electron., vol. 27, no. 4, pp. 1936–1951, Apr. 2012. [5] H.Wu, R. Chen, J. Zhang, Y. Xing, H. Hu, and H. Ge, “A family of three port half-bridge converters for a stand-alone renewable power system,” IEEE Trans. Power Electron., vol. 26, no. 9, pp. 2697–2706, Sep. 2012. © Copyright reserved by IJETR (Impact Factor: 0.997) 833