Overview of Soft-switching DC-DC Converters (original) (raw)
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IJERT-A Literature Review on Soft Switching DC-AC Converters
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/a-literature-review-on-soft-switching-dc-ac-converters https://www.ijert.org/research/a-literature-review-on-soft-switching-dc-ac-converters-IJERTV3IS070927.pdf Soft-switching techniques had gained popularity in recent times because they offer many advantages over hard-switched PWM inverters such as high efficiency, higher power density, less losses better performance. The resonant topologies employing soft-switching are classified based on the location of resonant networks in the inverter with respect to dc link and load. This is an exhaustive study of various resonant link inverter topologies. This literature review brings out merits, limitations besides giving the basic principle of operation of various topologies.
Soft-Switching DC-Ac Converters:- a Brief Literature Review
Soft-switching techniques have gained popularity in recent times because they offer many advantages over hard-switched PWM inverters such as higher efficiency, higher power density and better performances. The resonant topologies employing soft-switching are classified based on the location of resonant network in the inverter with respect to load and dc link. This is an exhaustive study of various resonant link inverter topologies that appeared in the literature in recent times. This critical literature review brings out merits, demerits, and limitations besides giving the basic operating principles of various topologies.
A review of soft-switched DC-AC converters
IEEE Transactions on Industry Applications, 1998
Soft-switching techniques have recently been applied in the design of dc-ac converters, in order to achieve better performance, higher efficiency, and higher power density. A substantial number of new topologies for different applications has been developed, however, the amount of work that has been done in this field is not widely known. This paper is an attempt to classify the soft-switched dc-ac topologies in a simple and generic way. The topology classifications are based on the location of the resonant network (load, inverter bridge, and bus), the characteristic of switching waveforms (zero-voltage switching or zero-current switching), and the type of resonance (series or parallel). Operating principles, performance, and design limitations are discussed. Some possible industrial applications of soft-switched dc-ac converters are addressed.
Soft-Switching dc-dc Converters
Springer eBooks, 2017
A class of dc-dc converters, known in the literature as soft-switching resonant converters, has been thoroughly investigated in recent years for its various attractive features. Soft switching means that one or more power switches in a dc-dc converter have either the turn-on or turn-off switching losses eliminated. This is in contrast to hard switching, where both turn-on and turnoff of the power switches are done at high current and high voltage levels. One approach is to create a fullresonance phenomenon within the converter through series or parallel combinations of resonant components. Such converters are generally known as resonant converters. Another approach is to use a conventional PWM buck converter, boost, buck-boost, Cuk, and SEPIC and replace the switch with a resonant switch that accomplishes the loss elimination. Because of the nature of the PWM circuit, resonance occurs for a shorter time interval compared to the full-resonance case. This class of converters, combining resonance and PWM, is appropriately known as quasi-resonance converters. In this chapter, our focus will be on the latter method, mainly using the resonance PWM switch to achieve soft switching. For simplicity, here we use the term soft switching to refer to dc-dc converters, quasi-resonance converters, and other topologies that employ resonance to reduce switching losses. Two major techniques are employed to achieve soft switching: zero-current switching (ZCS) and zero-voltage switching (ZVS). This chapter will focus only on ZCS and ZVS types of PWM dc-dc resonant switches and their steady-state analyses. 6.1 Types of dc-dc Converters As shown in previous chapters, linear-mode and switch-mode converters have been used widely in the design of commercial dc-dc power supplies. Linear power supplies offer the designer four major advantages: simplicity in design, no electrical noise in the output, fast dynamic response time, and low cost. Their applications,
A Novel High Efficiency Bidirectional Soft Switching DC-DC Converter
2018
Abstract-A novel topology for a non-isolated bidirectional DC-DC converter is presented here with softswitching capability, it usually operates at a zero-voltage-switching (ZVS) condition. In this circuit additional auxiliary circuit added for obtaining soft switching condition instead of adding auxiliary switches. The suggested auxiliary circuit consists of one resonant inductor and two capacitors. Soft-switching technology is to reduce switching losses. By generating and keeping a recycle current in the auxiliary circuits, this topology can provide soft-switching conditions for both switches. Due to the existence of the auxiliary circuits, it can reduce the current ripple in the main inductor. Here no auxiliary switches are used and also two main switches work in ZVS conditions. Main characteristic of this topology is not only operated with soft switching method but has simple structure and high efficiency. The modified converter simulated using MATLAB/SIMULINK R2014a software. Th...
Electronics
This paper presents a comparative analysis of the zero-voltage zero-current switching (ZVZCS) soft switching technique with zero-voltage switching (ZVS) and zero-current switching (ZCS) counterparts. The generalization of the voltage–current crossover or the energy loss factor obtained from simulation of the prototype converter shows that the ZVZCS significantly reduces the losses and helps to improve the efficiency of the converter as compared to the ZVS or the ZCS. On the other hand, it is also found that the soft switching range of operation of the ZVS and the ZCS is largely affected by the maximum switch voltage and switch current, respectively. In contrast, these factors have a negligible effect on the ZVZCS operation which results in an extended range of soft switching operation. Additionally, a detailed PSPICE simulation is performed for selected ZVS, ZCS, and ZVZCS topologies from the recent literature, and the switching losses in the main switches of the converters are meas...
An Improved Soft-Switching Buck Converter With Coupled Inductor
IEEE Transactions on Power Electronics, 2000
This letter presents a novel topology for a buck dcdc converter with soft-switching capability, which operates under a zero-current-switching condition at turn on and a zero-voltageswitching condition at turn off. In order to realize soft switching, based on a basic buck converter, the proposed converter added a small inductor, a diode, and an inductor coupled with the main inductor. Because of soft switching, the proposed converter can obtain a high efficiency under heavy load conditions. Moreover, a high efficiency is also achieved under light load conditions, which is significantly different from other soft-switching buck converters. The detailed theoretical analyses of steady-state operation modes are presented, and the detailed design methods and some simulation results are also given. Finally, a 600 W prototype is built to validate the theoretical principles. The switching waveforms and the efficiencies are also measured to validate the proposed topology.
A new family of soft transition converters: Design and dynamic model
Sadhana, 2008
The soft switching converters evolved through the resonant load, resonant switch, resonant transition and active clamp converters to eliminate switching losses in power converters. This paper briefly presents the operating principle of the new family of soft transition converters; the methodology of design of these converters is presented through an example. In the proposed family of converters, the switching transitions of both the main switch and auxiliary switch are lossless. When these converters are analysed in terms of the pole current and throw voltage, the defining equations of all converters belonging to this family become identical. Such a description allows one to define simple circuit oriented model for these converters. These circuit models help in evaluating the steady state and dynamic model of these converters. The standard dynamic performance functions of the converters are readily obtainable from this model. This paper presents these dynamic models and verifies the same through measurements on a prototype converter.
F m : +55 55 226 21 66, e-mail: leae@eeper. ufsm br UFSM-CT-DELC CT-This paper presents a family of soft-switching C power converters, which is suitdde for high power ations using IGBT's. These converters present the following characteristics: Commutation at zero-current (turn-on and turn-of8 for all active switches without overvoltage and overcurrent, commutation at zero-voltage for the free-whee~~ng diode and PWM operating ut constant frequency. Small power rated auxiliary components can be e feasibility of the proposed family of soft-power converters, the ZCS-PWM Boost Converter is analyzed. Operating principle, commutation analys~s and features are described and verified by ~ p e r ~ ~ e n ~ a ~ results obtained from U prototype operating at rated ai 155 V input voltage and 1.1 kWatts output power. The measured efficiency to full load was about 98%.