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A HIGH STEP-DOWN MULTIPLE OUTPUT CONVERTER WITH WIDE INPUT VOLTAGE RANGE BASED ON QUASI TWO-STAGE ARCHITECTURE AND DUAL-OUTPUT LLC RESONANT CONVERTER ABSTRACT: In this letter, a quasi two-stage architecture is proposed for wide input voltage range (voltage ranges _ 1:2) and high step-down multiple output conversion. A dc-DCX, which operates as a dc–dc converter with regulated output when the input voltage is low and as a dc–dc transformer with unregulated output when the input voltage is high, is adopted in the first stage to provide optimized intermediate dc-bus voltages for the second-stage pointof- load converters. The input and output of the dc-DCX are in series and connected to the total input voltage. Hence, part of the input power is directly transferred to the intermediate bus without conversion. The devices’ voltage stresses and the transformer turns ratio of the dc-DCX are reduced by using the proposed quasi two-stage architecture. Thus, the conversion efficiency is improved significantly. Furthermore, a dual-output LLC resonant converter with hybrid center-tapped and full-bridge rectifier is proposed for the dc-DCX to achieve high efficiency and high power density. A 100-W prototype with three outputs is built and tested to verify the analysis. INTRODUCTION: The two-stage architecture is a good candidate for the wide and-high input, multiple-and-low output applications. It has been proven that, although additional loss is introduced by the first-stage bus converter, the efficiency can still be improved with a very-high-frequency second-stage point-of-load (PoL) converter by reducing the intermediate bus voltage and using low-voltage-rating devices. If the input voltage range is narrow, a very high efficiency unregulated dc–dc transformer (DCX) can be employed as the front-end converter, because the unregulated converter can be designed at its optima operation point to achieve the highest efficiency. The two-stage architecture is a good candidate for the wideand- high input, multiple-and-low output applications . It has been proven that, although additional loss is introduced by the first-stage bus converter, the efficiency can still be improved with a very-high-frequency second-stage point-of-load (PoL) converter by reducing the intermediate bus voltage and using low-voltage-rating devices. If the input voltage range is narrow, a very high efficiency unregulated dc–dc transformer (DCX) can be employed as the front-end converter, because the unregulated converter can be designed at its optima operation point to achieve the highest efficiency .However, if the bus voltage range is wide, the output voltage regulation is required for the bus converter to provide an optimized intermediate dc bus voltage for the PoL converters. Otherwise, the intermediate bus voltage will vary within a wide range, and hence high efficiencywould not be achieved for the second-stage PoL converters. However, high efficiency within a wide input voltage range is difficult to achieve for a dc–dc converter with full voltage regulation . A tradeoff between the efficiency of the two stages is necessary to implement optimized efficiency of the whole system. In, a sigma converter based on a DCX and a dc–dc converter is proposed for high step-down PoL converter. The sigma converter seems to be a good solution for the bus converter because voltage regulation and high efficiency can be achieved . EXISTING SYSTEM: Synchronous rectifiers are used to improve the efficiency. Considering the voltage stresses on the switches, a full-bridge rectifier is used for the VBus1, and a centertapped rectifier is used for the VBus2. Therefore, two secondary windings and six synchronous-rectifying switches have to be used in the front-end converter PROPOSED SYSTEM: A multiple output dc–dc converter based on quasi two-stage architecture has been proposed in this letter. By connecting the input and output of the dc-DCX in series, 20%–25% ratio of the total input power is directly fed to the intermediate bus without conversion. Hence, the devices’ voltage stresses and transformer turns ratio of the dc-DCX can be reduced and high efficiency achieved for the front-end bus converter. By adopting the semi regulation control scheme, optimized intermediate bus voltages are provided for the second-stage PoL converters while considering the tradeoff between the efficiencies of the frontend converter and PoL converters. ADVANTAGES: Less number of switches. BLOCK DIAGRAM: Full bridge inverter resonant Circuit Centre tapped transformer Output 1 Synchronous rectifier Gate driver circuit BUFFER circuit 5 V DC INPUT DC supply PIC controller circuit Output 2 12 V DC TOOLS AND SOFTWARE USED: MPLAB – microcontroller programming. ORCAD – circuit layout. MATLAB/Simulink – Simulation APPLICATIONS: Aerospace and telecommunication applications. Satellite power system CONCLUSION: A multiple output dc–dc converter based on quasi two-stage architecture has been proposed in this letter. By connecting the input and output of the dc-DCX in series, 20%–25% ratio of the total input power is directly fed to the intermediate bus without conversion. Hence, the devices’ voltage stresses and transformer turns ratio of the dc-DCX can be reduced and high efficiency achieved for the front-end bus converter. By adopting the semiregulation control scheme, optimized intermediate bus voltages are provided for the secondstage PoL converters while considering the tradeoff between the efficiencies of the frontend converter and PoL converters. To improve the power density and reduce the cost, a hybrid center-tapped and full-bridge rectifier has been proposed for the dual-output LLC resonant converter. Experimental results on a 48–85 V input and three outputs (10 V/8A, 5 V/2A, and 3.3 V/2A) prototype indicate that high efficiency within wide input voltage (voltage ranges _1:2) and load ranges has been achieved with the proposed solution. REFERENCES: [1] S. Luo and I. Batarseh, “A review of distributed power systems part I: DC distributed power system,” IEEE Aerosp. Electron. Syst. Mag., vol. 20, no. 8, pp. 5–16, Aug. 2005. [2] Z. Varadi, V. Gorocz, and J. Szabo, “Power subsystem for small satellites with unified operational mode controller,” in Proc. 2nd IEEE Int. Conf. Space Technol., 2011, pp. 1–4. [3] F.Musavi, M. Craciun, D. S. Gautam,W. Eberle, andW. G. Dunford, “An LLC resonant DC–DC converter for wide output voltage range battery charging applications,” IEEE Trans. Power Electron., vol. 28, no. 12, pp. 5437–5445, Dec. 2013.