A. Lavanya

Efficiency comparison of quadratic boost DC-DC converter in CCM and DCM

This paper presents efficiency comparison of quadratic boost converter in continuous conduction mode (CCM) and discontinuous conduction mode (DCM). Analytical expression for the DC component and RMS component of currents in CCM and DCM is derived. Total losses incurred in quadratic boost converter are calculated. Discontinuous conduction modes in three cases are discussed. The simulation result in software MATLAB/SIMULINK is presented for validating the results obtained by mathematical theories.

High Step-up DC-DC Converter by Switched Inductor and Voltage Multiplier Cell for Automotive Applications

This paper elaborates two novel proposed topologies (type-I and type-II) of the high stepup DC-DC converter using switched inductor and voltage multiplier cell. The advantages of these proposed topologies are the less voltage stress on semiconductor devices, low device count, high power conversion efficiency, high switch utilization factor and high diode utilization factor. We analyze the Type-II topologies operating principle and mathematical analysis in detail in continuous conduction mode. High-intensity discharge lamp for the automotive application can use the derived topologies. The proposed converters give better performance when compared to the existing types. Also, it is found that the proposed type-II converter has relatively higher voltage gain compared to the type-I converter. A 40 W, 12 V input voltage and 72 V output voltage has developed for the type-II converter and the performances are validated.

Multi-input DC-DC converter topologies-a review

Multi-port converters have fewer components count and less conversion stage than the traditional power processing solution which adopts several independent two-port converters. This paper emphasis on the use of a single power processing stage to interface multiple power inputs integrates power conversion for a hybrid power source. The classification of various multiport dc-dc converters topologies both isolated and non isolated are studied and the features are listed.

Comparison of high gain topologies of non-isolated dc-dc converters for fuel cell application

This paper compares different topologies of non-isolated high conversion ratio dc-dc converter for fuel cell application. These converters transfer the low dc voltage of fuel cell to high dc voltage in dc link. In this study, ripple content of both input current and output voltage are compared and discussed. A comparison and discussion of the voltage and current stress on the switch are also presented in this paper. Study carried out on this paper intends to choose the best converter for fuel cell application. The proposed converter has high conversion ratio with reduced voltage and current stresses on the power semi conductor switches when compared to the conventional boost converter. This analysis helps to choose the best converter for fuel cell system and also to other renewable energy systems. Simulation is conducted over MATLAB/ simulink.

Non-isolated high gain DC-DC converter for smart grid- A review

Smart grids are becoming the most interesting and promising alternative for an electric grid system. Power conditioning units and control over the distribution of power is the essential feature for the smart grid system. In this paper, we reviewed several non-isolated high gain topologies derived from boost converter for providing required voltage to the grid tie inverter from renewable energy sources. Steady state analysis of all the topologies is analyzed to compare the performance of the topologies. Simulation is carried out in nL5 simulator and the results are compared and validated with the theoretical results. This paper is a guide to the researchers to choose the best topology for the smart grid application.

Effect of pole zero location on system dynamics of boost converter for micro grid

Green clean energy like photo voltaic, wind energy, fuel cell can be brought together by microgrid.For low voltage sources like photovoltaic cell boost converter is very much essential. This paper explores the dynamic analysis of boost converter in a continuous conduction mode (CCM). The transient performance and stability analysis is carried out in this paper using time domain analysis and frequency domain analysis techniques. Boost converter is simulated using both PSIM and MATLAB software. Furthermore, state space model obtained and the transfer function is derived. The converter behaviour when a step input is applied is analyzed and stability of the converter is analyzed from bode plot frequency for open loop. Effect of the locations of poles and zeros in the transfer function of boost converter and how the performance parameters are affected is discussed in this paper. Closed loop performance with PI controller is also analyzed for boost converter.

Analysis of modified quadratic DC-DC boost converter

This paper proposes a modified quadratic boost converter with high efficiency and reduced cost. This converter mainly comprises of the quadratic part. The newly proposed converter in this paper is compared with a quasi z source converter which is a quadratic boost converter. The current ripples, cost, efficiency, losses and the complexity of the converters are considered. The steady state analysis of this converter is done in continuous conduction mode and the results are presented. The power loss across each elements are presented and the efficiency is calculated from the losses. P Spice simulation of the modified quadratic converter is done and the outputs are verified with theoretical results.

Dual input DC-DC converter for renewable energy systems

This paper proposes a dual input high step-up boost converter for grid-connected photovoltaic power generation system. Four different DC-DC converters are considered for analysis. From the result of the analysis, the converter with reduced component count and current ripple is identified and proposed for the grid connected PV power generation system. Next, the mode of operation of the proposed converter is discussed along with its circuit modeling and performances are analyzed in detail. The proposed converter is analyzed using MATLAB simulations. The proposed converter includes multiplier cells which boosts the converter to a high step voltage. Finally, closed loop control is performed with a PI controller. This is done in order to keep the output voltage constant.

Performance analysis of coupled inductor based Quadratic boost converter

This paper introduces a high gain DC-DC converter for HID lamps used in automotive applications as head lamps. A family of coupled inductor based high step-up converters is introduced and their voltage conversion ratio is derived. In the proposed topologies, a topology with minimal component count is selected and analyzed completely. Steady state analysis of the converter is studied and it is compared with another couple inductor based topologies on literature to confirm its superiority. Simulation is carried out and the results are presented.

Efficiency Modeling of High Gain DC-DC Converter for Renewable Energy Application

This paper presents a high efficiency step-up DC-DC converter for Low-DC renewable energy sources. Conventional DC converters can offer limited gain and their efficiency drops as the gain requirement increases. Efficiency modeling of each dc-dc converter accurately predicts the behavior of DC-DC converter. A comparison is made in this paper between a number of high gain DC-DC converter topologies, and it is shown that the proposed converter outperforms other topologies in terms of efficiency and component utilization. Thus, the achieved low cost and high efficiency of the proposed converter make it suitable for low-PV application.