Performance of a Voltage Step-Up/Step-Down Transformerless DC/DC Converter: Analytical Model (original) (raw)
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Design and implementation of a new high step-up DC-DC converter for renewable applications
International Journal of Circuit Theory and Applications, 2019
In this paper, a new structure for a DC-DC boost converter is proposed. The presented converter provides a high voltage transfer gain with lower duty cycle. Low current and low voltage stress on the switch, enlarged area of operating in continuous conduction mode (CCM), reduced size of the inductors, and the input filter are the main advantages of the proposed converter. The high voltage transfer gain with low number of elements has made it suitable to implement. Hence, using only one switch has made the control of the proposed converter easy. Besides, decreased switching losses and higher efficiency are obtained. The proposed structure is a combination of the Luo converter and a booster unit, which its analysis is studied in three modes, CCM, boundary conduction mode (BCM), and discontinuous conduction mode (DCM). Furthermore, in order to validate the analysis and feasibility of the proposed converter, the experimental results are developed on a low power prototype.
This paper presents the performance analysis of transformer less dc-dc converters to achieve high step-up voltage gain without an extremely high duty ratio. The technique used to design the equivalent circuit of these converters is switched-inductor with voltage lift circuit, allowing a boost of the input voltage to high values. In this paper describes the steady-state analysis of voltage gain for all the converters(dc-dc step up, dc-dc step dawn). For the execution of proposed converters the MATLAB/SIMULINK software has been used. Finally the comparative analysis of proposed converters with conventional boost converter which shows that proposed converters have higher voltage gain and reduced voltage stress. INTRODUCTION In many technical applications, it is required to convert a set voltage DC source into a variable-voltage DC output. A DC-DC switching converter converts voltage directly from DC to DC and is simply known as a DC Converter. A DC converter is equivalent to an AC transformer with a continuously variable turns ratio. It can be used to step down or step up a DC voltage source, as a transformer. DC converters are widely used for traction motor control in electric automobiles, trolley cars, marine hoists, forklifts trucks, and mine haulers. They provide high efficiency, good acceleration control and fast dynamic response. They can be used in regenerative braking of DC motors to return energy back into the supply. This attribute results in energy savings for transportation systems with frequent steps. DC converters are used in DC voltage regulators; and also are used, with an inductor in conjunction, to generate a DC current source, specifically for the current source inverter.
IJERT-Analysis and Modeling of Transformerless High Gain Buck-Boost DC-DC Converters
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/analysis-and-modeling-of-transformerless-high-gain-buck-boost-dc-dc-converters https://www.ijert.org/research/analysis-and-modeling-of-transformerless-high-gain-buck-boost-dc-dc-converters-IJERTV3IS060890.pdf This paper proposes a transfomerless switched capacitor buck boost converter that is based on a traditional buck boost topology. The proposed converter achieves high voltage gain and higher efficiency when compared to the conventional buck boost converter. The average model based on state-space description is analyzed in the paper. The simulation results are presented to confirm the capability of the converter to generate high-voltage ratios. The proposed converter is suitable for applications which require high step-up DC-DC converters such as DC micro-grids and solar electrical energy.
Design of Novel Step-up Boost DC/DC Converter
Iranian Journal of Science and Technology, Transactions of Electrical Engineering, 2017
Role and importance of DC/DC converters have been more and more fluoresced in distributed power systems applications such as photovoltaic, wind turbine, gas micro turbine and fuel cells. With regard to this characteristic, distributed power systems have to employ a high step-up DC/DC converter. Low voltage supply with wide range voltage drop is a distinguishing feature of these sources considering the dependency of the generated energy on weather condition. A novel high gain boost DC/ DC converter is proposed in this study. Compared with classic topologies, the boost ability of the proposed topology is strengthened. The voltage stress of the capacitors, diodes, and power devices is reduced. The proposed converter has a switching network for the inductor which allows the use of smaller inductors. The steady-state operation of the suggested converter is analyzed thoroughly. Finally, both the results of the simulation and laboratory prototype have verified the feasibility of the proposed topology.
Transformerless DC-DC step-up topologies with symmetrical outputs for renewable energy applications
2011 IEEE International Symposium on Industrial Electronics, 2011
In this work two transformerless DC-DC step-up converter topologies with symmetrical outputs are proposed for renewable energy applications. Both of them are based on the interleaved operation of two single structures of the combined H-bridge with a voltage doubler rectifier, which was introduced in a previous work. Experimental results are presented to evaluate the control strategy for balancing the output mid-point voltage of the combined H-bridge with voltage doubler. PSCAD/EMTDC TM simulations of the proposed interleaved converters, while operating with balanced symmetrical outputs, are presented in order to show their effectiveness as a front-end of multilevel inverters, when multiple DC input sources, such as solar photovoltaic arrays, are used.
FORMULATION AND EXECUTION OF A DC TO DC BOOST CONVERTER WITH NON-CONVENTIONAL ENERGY RESOURCE
IRJET, 2023
As we all know, due to the distance between the generating power plant station and the demand, there are considerable losses in transporting electrical power. To limit these losses, we use distributed generation. The DG system generates electricity from both conventional and nontraditional sources. With efficiency ranging from 40% to 60%, hydrogen fuel cells are one of the non-conventional energy sources. We also know that hydrogen does not exist in nature, thus it must be created in laboratory. There are various ways to accomplish this. One of this is hydrogen production via the water electrolysis method. We also require power to produce hydrogen, which we obtain from solar panels. A DC-DC Boost Converter is used to accomplish voltage control, allowing the system to provide consistent power.
Sustainability
This paper introduces a novel topology of the proposed converter that has these merits: (i) the topology of the converter is based on conventional boost and buck-boost converters, which has caused its simplicity; (ii) the voltage gain of the converter has provided higher values by the lower value of the duty cycle; (iii) due to the use of high-efficiency conventional topologies in its structure, the efficiency of the converter keeps its high value for a great interval of duty cycle; (iv) besides the increase of the voltage gain, the current/voltage stresses of the semiconductors have been kept low; (v) the continuous input current of this converter reduces the current stress of the capacitor in the input filter. It is worth noting that the proposed converter has been discussed in both ideal and non-ideal modes. Moreover, the operation of the converter has been discussed in both continuous/discontinuous current modes. The advantages of the converter have been compared with recently s...
Simulation of Transformerless DC- DC Boost Converter for High Step-Up Voltage Gain
International Journal of Engineering Sciences and Research Technology, 2016
This paper presents the performance analysis of transformer less dc-dc converters to achieve high step-up voltage gain without an extremely high duty ratio. The technique used to design the equivalent circuit of these converters is switched-inductor with voltage lift circuit, allowing a boost of the input voltage to high values. In this paper describes the steady-state analysis of voltage gain for all the converters(dc-dc step up, dc-dc step dawn). For the execution of proposed converters the MATLAB/SIMULINK software has been used. Finally the comparative analysis of proposed converters with conventional boost converter which shows that proposed converters have higher voltage gain and reduced voltage stress.
A High-Voltage-Gain DC–DC Boost Converter with Zero-Ripple Input Current for Renewable Applications
Energies
Renewable energy sources in DC microgrids require high-performance conversion systems to increase their capacity and reliability. Among other characteristics in conversion systems, the current ripple is a characteristic that must be considered since it affects the performance of PV panels and batteries. In this paper, a high-voltage-gain DC–DC boost converter for performing current ripple elimination that is based on a variable inductor is proposed. The topology is composed of a diode–capacitor voltage multiplier and a modified cascaded boost converter. To achieve voltage regulation, a reduced-order switched model is obtained considering the switched capacitor’s dynamics. To address the inductance variation and external disturbances, the H∞ control theory is adapted to systematically design a robust proportional–integral (PI) controller. Details of the working principles and the sizing of passive components are presented. The simulation and experimental results demonstrate that the ...
A new step-up high voltage gain dc-dc converter
2010 9th IEEE/IAS International Conference on Industry Applications - INDUSCON 2010, 2010
A new high voltage gain dc-dc converter is proposed on this work as a viable solution to step-up a low battery voltage into a high voltage dc link. This converter is suitable for non-isolated on-line UPS systems with common neutral connection, that improves bypass circuit installation. Furthermore, smaller size, higher efficiency, and increased reliability are features that spread the transformerless products. The adopted control strategy uses a hybrid control that implements both analog and digital controllers, that implements the average current mode control. It presents characteristic of continuous input current through the batteries that improve its lifetime, the maximum voltage across the controlled switches is equal to one fourth of the total output voltage, and voltage equalization across the dc-link capacitors is intrinsic. In order to verify the feasibility of this topology, principle of operation, theoretical analysis, and experimental waveforms are shown for a 1.55 kW assembled prototype.