High Efficiency Single Input Multiple Outputs Boost Converter

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High Efficiency Single Input Multiple Outputs Boost Converter #0 High Efficiency Single Input Multiple Outputs Boost Converter #1 High Efficiency Single Input Multiple Outputs Boost Converter #2 High Efficiency Single Input Multiple Outputs Boost Converter #3 High Efficiency Single Input Multiple Outputs Boost Converter #4 High Efficiency Single Input Multiple Outputs Boost Converter #5 High Efficiency Single Input Multiple Outputs Boost Converter #6

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High Efficiency Single Input Multiple Outputs Boost Converter Niharika M. DeshpandeDepartment of Electrical EngineeringSardar Patel College of EngineeringAndheri, Mumbai (MS), [email protected] D. ChavhanDepartment of Electrical EngineeringSardar Patel College of EngineeringAndheri, Mumbai (MS), [email protected] M. DeshpandeDepartment of Industrial Electronics Bharati Vidyapeeth Institute of Tech.Navi Mumbai (MS), [email protected]— In this paper, the proposed SIMO (Single input multiple outputs) DC-DC converter based on coupled inductor scheme. The proposed converter is able to boost a low input voltage source, like renewable sources, to achieve controllable high DC voltage and middle dc voltage with high voltage gain. The high voltage dc bus can take as the main power for a high voltage dc load. Moreover, middle voltage output terminals can supply powers for individual middle voltage dc loads or for charging auxiliary power sources like battery modules. This SIMO converter utilizes a coupled inductor scheme with only one power switch. It includes the techniques of voltage clamping and soft switching. The simulation result in PSIM software shows that the objectives of high efficiency, high step up ratio, various output voltages with different levels, are achieved. Keywords—Single input multiple output (SIMO) converter, Coupled inductor, soft switching, voltage clamping, PSIM. Introduction Fossil fuels are the most commonly used fuel for power generation. Cost of such fuels is increasing day by day and use of such fuels severely affects the environment. Considering the global warming and greenhouse effect on environment, renewable energy is the solution for saving environment. The converters with different topologies are used to generate power from renewable energy sources like photovoltaic, wind, fuel cells etc. Many researchers have work over single input single output dc–dc converters. Various single-input single-output dc–dc converters with different voltage gains are combined to satisfy the requirement of various voltage levels, but it results in increase in cost and complicated control scheme. This study will motivate to design SIMO converter for improvement of power conversion efficiency, reducing complexity of the control system and decreasing manufacturing cost. It also includes the voltage clamping and soft switching techniques to reduce switching losses.Patra et al. [2] presented a SIMO dc–dc converter that is capable of generating buck, boost, and inverted outputs simultaneously. However, over three switches for one output were required and the design is only suitable for the low output voltage and power application. Due to hard switching its power conversion ratio is low. Nami et al. [3] proposed dc–dc multi output boost converter, which is suitable for different range of output voltage for low/high application. Unfortunately, over two switches for one output were required, and its control scheme was complicated. Chen et al. [4] had presented a multiple-output DC-DC converter using shared ZCS lagging leg topology. However, the converter uses the soft switching property to reduce switching losses, the combination of three full-bridge converters, which increase density of electronics component used in circuit. Therefore, its cost increased and it is difficult to accomplish objectives of the high efficient converter. Maria et al.[5] summarized new single input multiple output converter topologies.This paper introduced newly designed coupled inductor based Single Input Multiple Output converter. In order to achieve the objectives of high efficient DC-DC SIMO converter, it had one power switch to achieve increased power conversion efficiency, high conversion ratio, and different levels of output voltage. The proportional control (PI) technique is used to control the output voltage at high voltage side circuit. This study is arranged in five sections. Following the introduction, the converter design and assumption made to operate converter are given in Section II. In Section III, the operating modes of the proposed SIMO converter are discussed in detail. Section IV provides simulations results in PSIM to validate the effectiveness of the proposed converter. Finally, some conclusions are made in Section V.SIMO Converter The proposed SIMO converter topology is able to generate two different level DC voltages from a single input dc voltage power source as shown in Fig. 1. This SIMO converter configuration is divided into five regions which includes Low voltage side circuit (LVSC), Clamped circuit, Middle voltage circuit, Auxiliary circuit, High voltage side circuit (HVSC). Major symbols used in this configuration are summarized as follows. Vin and iin are the input voltage and input current at the LVSC. Vo1 (io1) and Vo2 (io2) denotes the voltages (currents) at auxiliary circuit and HVSC, respectively. Cin, Co1, and Co2 are filtering capacitor at the LVSC, the auxiliary circuit, and the HVSC, respectively. C1 and C2 are the clamped and middle voltage capacitors in the clamped and middle voltage circuits, respectively. Lp and Ls represents individual inductors in primary and secondary sides of the coupled inductor Tr, respectively. The positive polarity of the primary and secondary windings of the coupled inductor is marked in dots. Laux is the auxiliary circuit inductor. The main switch, S1 in the LVSC; the equivalent load in the auxiliary circuit is represented as RO1, and the output load is represented as RO2 in the HVSC.System configuration of SIMO converterEquivalent circuit of SIMO converterThe equivalent circuit of system configuration is shown in fig.2, which is used to define the voltage polarities and current directions. The coupled inductor used in system configuration is modified as an ideal transformer with magnetizing (Lmp) and leakage (Lkp) inductors in fig2. The turns ratio N and coupling coefficient k is given as (1)(2)Where, N1 and N2 are the number of turns of primary and secondary winding of the coupled inductor respectively. As voltage gain is less sensitive to the coupling coefficient, the coupling coefficient is set to one (k=1) to obtain Lmp=Lp. The clamped capacitor C1 is selected in such a way that it can completely absorb the leakage inductor energy [13].Operating modesThe characteristics waveforms are shown in fig 3.Characteristic waveforms of SIMO converter[1]Mode 1(t0 – t1)In this mode, main the switch S1 turned ON for a fraction of time. The diode D4 turned OFF. Due to the positive polarity of coupled inductor’s winding, the diode D3 becomes forward biased. The middle-voltage capacitor C2 gets charged because the secondary current iLs flows in reverse direction. When the auxiliary inductor Laux of the auxiliary circuit completely releases its stored energy and the diode D2 becomes reverse biased, this will be end of mode 1.Mode 1Mode 2(t1 – t2)At t=t1, the main the switch S1 continues to be in the ON condition. The primary inductor Lp is charged by the input power source. The magnetizing current iLmp increases gradually in an approximately linear way. At the same time, the secondary voltage vLs charges the middle voltage capacitor C2 through the diode D3. Though voltages vLmp and Vin are equal in mode 1 and mode 2, the ascendant slope of the leakage current of the coupled inductor diLkp/dt at both mode 1 and mode 2 is different because of the path of the auxiliary circuit. The auxiliary inductor Lp releases its stored energy completely, and the diode D2 turns OFF at the end of mode 1, it results in the decrease of diLkp/dt at mode 2.Mode 2Mode 3 (t2 – t3)At t=t2, the main switch S1 is turned OFF. The diode D3 remains in conduction because the leakage energy still releasing from the secondary side of the coupled inductor and releases the leakage energy to the middle voltage capacitor C2. When the voltage across the main switch VS1 is great

 

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