Unified Approach for Synthesis and Analysis of Non-Isolated DC-DC Converters (original) (raw)

General properties and synthesis of PWM DC-to-DC converters

20th Annual IEEE Power Electronics Specialists Conference, 1989

Geneml properties that internlate the network complen.&, a#aanable amversion ration and nuitch &eraer are derived for P W M DCto-DC converters. l?w emerpkg qnfhedr pmcedure guananta8 that complete clamen of converters that A'& a set of prescribed rpccificcrtions a m genemted The input rpcci)kationr include the demred DC convermon mtio, non-puldthg terminal cumnta, posrible coupling of inductors, the dlowed number of nuitches and, in par(icular, the number of active tmnaidor switches. A s a result, a number of novel P W M topologies are uncovend 1 Introduction

A Theoretical Study of Performance and Design Constraints of Non-Isolated Dc-Dc Converters

This paper investigates the effect of the variation of duty ratio on the different performance parameters of the three non-isolated dc-dc converters namely buck, boost and buck-boost converter. Five important parameters dependent on the duty ratio have been identified namely output voltage, output current, effective impedance at the input, minimum inductance and minimum capacitance for continuous conduction mode (CCM). The effect of variation duty ratio on the performance of these parameters is investigated and reported. I. INTRODUCTION The world energy consumption is increasing while the fossil fuel energy reserve is on the verge of depletion. The future energy scenario will consist of a much needed dependence on the renewable energy sources like solar, wind, geothermal, biomass, etc. These new or alternate energy sources although being promising, their use and production of energy from them are still much more expensive than their relative counterparts of existing conventional sou...

Comparative analysis of three dc-dc non-isolated buck converters

2012 10th IEEE/IAS International Conference on Industry Applications, 2012

This paper presents a comparative analysis of three dc-dc non-isolated buck converters. For this purpose, a classical buck converter, an interleaved buck converter, and a three-state switching cell (3SSC) buck converter were analyzed. In order to best compare the performance of these topologies, the switching frequency, processed power, current ripple before the filter capacitor, and specification were considered equals for all tested configurations. A modular prototype of 1 kW, 200 Vdc / 60 Vdc was implemented, allowing to easily configure all topologies by just changing the magnetic components. From the experimental results, it was found that all studied converters present some current unbalance, being the less critical in the converter based on 3SSC. I.

A current and future study on non-isolated DC–DC converters

Photovoltaic (PV) is a fast growing segment among renewable energy (RE) systems, whose development is owed to depleting fossil fuel and climate-changing environmental pollution. PV power output capacity, however, is still low and the associated costs still high, so efforts continue to develop PV converter and its controller, aiming for higher power-extracting efficiency and cost effectiveness. Different algorithms have been proposed for Maximum Power Point Tracking (MPPT). Since the choice of right converter for different application has an important influence in the optimum performance of the photovoltaic system, this paper reviews the state-of-the-art in research works on non-isolated DC-DC buck, boost, buck-boost, Cú k and SEPIC converters and their characteristics, to find a solution best suiting an application with Maximum Power Point Tracking. Review shows that there is a limitation in the system's performance according to the type of converter used. In can be concluded that the best selection of DC-DC converter which is really suitable and applicable in the PV system is the buck-boost DC-DC converter since it is capable of achieving optimal operation regardless of the load value with negotiable performance efficiency and price issue.

Comparative study on DC-DC Converters

2012

I hereby declare that this thesis is based on the results I found in my pre-thesis and thesis work. Contents of work found by other researchers are mentioned by reference. This thesis has never been previously submitted for any degree neither in whole nor in part.

Multiple-Output DC–DC Converters: Applications and Solutions

Electronics

Multiple-output DC–DC converters are essential in a multitude of applications where different DC output voltages are required. The interest and importance of this type of multiport configuration is also reflected in that many electronics manufacturers currently develop integrated solutions. Traditionally, the different output voltages required are obtained by means of a transformer with several windings, which are in addition to providing electrical isolation. However, the current trend in the development of multiple-output DC–DC converters follows general aspects, such as low losses, high-power density, and high efficiency, as well as the development of new architectures and control strategies. Certainly, simple structures with a reduced number of components and power switches will be one of the new trends, especially to reduce the size. In this sense, the incorporation of devices with a Wide Band Gap (WBG), particularly Gallium Nitride (GaN) and Silicon Carbide (SiC), will establi...

A new isolated DC-DC boost converter using three-state switching cell

2008

In this paper, a new isolated DC-DC boost converter based on three-state switching cell (3SSC) is proposed. The mentioned cell allows the use of only two windings in the isolation transformer, as well as, the series connection of only one DC current blocking capacitor to avoid its saturation. Other relevant characteristics of the converter are, the blocking voltage across the controlled switches is low, which allows the utilization of lower drain-to-source conduction resistances (RDSon) MOSFETs, and the current through the autotransformer winding is almost continuous minimizing the hysteresis losses on the magnetic core. In this way, the efficiency of the proposed converter is high, and it is recommended for the development of power supplies using low voltage sources commonly found on renewable energy conversion systems and batteries. The converter was analyzed in overlapping of the control signals or duty cycle higher than 0.5 operating in continuous conduction mode (CCM). In order to verify the feasibility of this topology; principle of operation, theoretical analysis, and experimental waveforms are shown for a 1kW assembled prototype.

Non-isolated Switch Mode DC-DC Converters

Springer eBooks, 2017

In this chapter we discuss converter circuits that are used in power electronic circuits and systems to change the voltages from one dc level to another dc level. Once again, switching devices will be used to process energy from the input to the output. Since the input here is dc, which comes from a post-filtering stage, these devices are normally operated at much higher frequencies than the line frequency, reaching as high as a few hundred kilohertz. This is why such converter circuits are known as high-frequency dc-dc switching converters or regulators. The term regulator is used since the circuit's main commercial application is in systems that require a stable and regulated dc output voltage. Depending on whether or not an output transformer is used, high-frequency dc-dc switching converters are classified as isolated or non-isolated. In this chapter and in the next, the emphasis will be on the steady-state analysis and design of several well-known second-and fourth-order dc-dc converters, each having its own features and applications. We will consider those topologies that do not use high-frequency isolation transformers as part of their power stage. Moreover, a large number of applications require output electrical isolation and multiple outputs that cannot be achieved using the basic topologies discussed in this chapter. The isolated and magnetically coupled topologies will be discussed in Chap. 5. Such topologies are the most popular in the power supply industry and are used in various types of electronic equipment whose design requires outputs with electrical isolation and multi-outputs.

Design Of DC-DC Converter - IRE Journals

2019

This is a Two-switch converter belongs to fourth-order family and performs boosting operation. A new two-input Buck-SEPIC DC-DC converter suitable to draw power from two different dc sources feeding a common dc-bus is presented in this paper The salient feature of the proposed converter is that both the sources are simultaneously supplying power to the downstream load at reduced ripple current. This feature is particularly attractive for dc grid application. I.