Ecen 5817 resonant and softswitching techniques in power electronics spring 2014. Develop low thermal impedance module with integrated heat sink for high temperature operation. Topologies, control, and design is an essential and valuable reference for graduate students and academics majoring in power electronics and power supply design engineers. Sudha and lalit a novel phase shifted dcdc converter with adaptive soft switching to improve efficiency under wide load range energy in the inductor. For pulsewidth modulated pwm dcdc converters, both zvs and zcs are typically. Recently, a number of softswitching pluswidthmodulated pwm converter techniques have been proposed, aimed at combining the desirable features of both the conventional pwm and resonant converters while avoiding their respective limitations. Analysis and study between two soft switching techniques used. Some zvs and zcs techniques requires variablefrequency control to regulate the output, which is a disadvantage. This paper proposes a dual mode used to control a single phase soft switching boost power factor correction converter pfc developed with a new active snubber circuit.
Both the zvtpwm and zctpwm techniques use the concept of shunt resonant network to achieve soft switching. Various forms of softswitching techniques such as zvs, zcs, voltage clamping, and zerovoltage transition methods are. This chapter covers the basic technology of resonant and softswitching converters. Articles for softswitching technologies monitoring service offers mobile access.
Analysis and evaluation of softswitching inverter techniques. Out of three methods, circuit switching and packet switching are commonly used but the message switching has been opposed out in the general communication procedure but is still used in the networking application. Ecen 5817 resonant and softswitching techniques in power electronics instructor. Softswitching techniques for pulsewidthmodulated converters. There are two popular switching techniques circuit switching and packet switching. Fastest switching series, suitable for hard switching topologies and soft switching. Early works on softswitching pwm fullbridge converter by many researchers included various topologies and modulation strategies. Pdf overview of softswitching dcdc converters researchgate. Soft switching converters also provide an effective solution to suppress emi and have been applied to dcdc, acdc, and dcac converters. Softswitching technologies offer the most affordable, effective and scalable power quality and monitoring solutions available on the market. Circuit switching packet switching message switching version 2, cse iit kharagpur page 4 module 4 switched communication networks version 2, cse iit kharagpur lesson 1 switching techniques.
This invention relates to new soft switching techniques for minimizing switching losses and stress in power electronic circuits using inverter legs. The hard facts on soft switching electronic design. Resonant and softswitching converters sciencedirect. Switching locus typical switching loci for a hardswitching converter without and with a snubber circuit as shown in fig. By choosing the switching frequency with specific relationships with the resonant frequency of the power electronic circuits, the proposed switching technique enables the power electronic circuits to achieve soft switching under full load and. Types of switching techniques data communication and. Resonant and soft switching converter recently, switchmode power supplies have become smaller and lighter due to higher switching frequency. Ecen5797 introduction to power electronics textbook. Us7110269b2 softswitching techniques for power inverter. Hard and soft switching of power semiconductors nptel.
A novel phase shifted dcdc converter with adaptive soft. Ecen 5817 resonant and softswitching techniques in power. Abstractthis paper is a detailed study on methods of battery charging with buck resonant converter using soft switching techniques like zvs and zcs. However, these works were scattered, and the relationship among these topologies and. Soft switching techniques for pulsewidthmodulated converters hua, guichao on. Abstructxecently, a number of softswitching pulsewidth modulated pwm converter techniques have been proposed, aimed at combining the desirable. Interleaved softswitching buck converter with coupled inductors. Right fit for consumer applications with competitive cost, fast delivery and high quality for use in hard and soft switching topologies. Softswitching techniques rectifier power electronics. In this way, the new converters achieve soft switching without increasing the voltage and current stresses of the power switches and diodes.
Develop a highly integrated softswitch module for low. Develop a hybrid switchbased softswitching circuit to reduce the conduction voltage drop at light load. In this paper, properties of soft switching methods named as zero voltage transition zvt, zero current transition. Study of soft switching techniques on three level three. Although numerous soft switching inverter techniques were claimed to improve the inverter performance, compared with the conventional hard switching inverter, there is the lack of comprehensive investigations of analyzing and evaluating the performance of soft switching inverters. Quite a number of soft switching techniques had been reported in the past four decades. In this way, the new converters achieve softswitching without increasing the voltage and current stresses of the power switches and diodes. The additional circuits developed for soft switching are called snubber cells.
Zerocurrent switching quasiresonant converters similar to textbook section 20. In this paper, a softswitching singleendedprimaryinductance converter sepic with multioutput sources is proposed. Advanced soft switching inverter for reducing switching. Soft switching techniques is very attractive and mediumfrequency. Lecture notes power electronics electrical engineering. The auxiliary current flowing through the switch is given by 1 t t 1 l v i t i t e i a a 2 where, i a t 1. Aim of data communication and networking is to facilitate the exchange of data such as audio, text or video between various points in the world. Study of soft switching techniques on three level three phase.
Recently, soft switching techniques have been developed to eliminate the problems previously explained. However, the switching losses are increased by increasing the frequency. Soft switching soft switching is a switching method used to minimize or eliminate the switching losses and emi noises with additional circuits or minimizing. Softswitching dcdc converters outlines classification of soft switching resonant converters. Us7262979b2 current source wave voltage inverter voltage. The switching performed by different nodes can be categorized into the following three types. Sep 22, 2015 recently, a number of soft switching pluswidthmodulated pwm converter techniques have been proposed, aimed at combining the desirable features of both the conventional pwm and resonant converters while avoiding their respective limitations. Extension of statespace averaging to resonant switches see also sects. For the delivery of data or information with the ease of accuracy various types of switching techniques are employed in the data.
Interleaved softswitching buck converter with coupled. Soft switching techniques for pulsewidthmodulated converters. However, these works were scattered, and the relationship among these topologies and modulation. Pdf analysis and study between two soft switching techniques. Softswitching techniques for mediumvoltage isolated. The course covers the analysis methods and design challenges associated with softswitching and resonant converters. Soft switching pwm fullbridge converters have been widely used in mediumtohigh power dcdc conversions for topological simplicity, easy control and high efficiency. Senior undergraduate students majoring in electrical engineering and automation engineering would also fi nd this book useful. Pdf application of soft switching in dcdc converter has achieved a remarkable success in power electronics technology in terms of reduction in. In large networks, there may be more than one paths for transmitting data from sender to receiver.
Soft switching techniques require more complex control circuits because the switch timing must be coordinated with. Caoveners, multiant mveners, and most recmfly to softswitching. Apr 08, 2014 this book intends to describe systematically the soft switching techniques for pulsewidth modulation pwm fullbridge converters, including the topologies, control and design, and it reveals the relationship among the various topologies and pwm strategies previously proposed by other researchers. Chapter 2 circuit and packet switching stanford university. Extension of statespace averaging to resonant switches example 80 kb.
A full array of scalable, batteryfree dysc products. Softswitching techniques for mediumvoltage isolated bidirectional dcdc converters in solid. What is soft switching switching transitions occur under favorable conditions device voltage or current is zero reduced switching losses, switch stress, possibly low emi, easier thermal management a must for very high frequency operation, also medium frequency at high power levels. In this way, the switching losses decrease and high switching frequency can be achieved.
Resonant converters and rf radio frequency power circuits pdf 1. Comparison of basic soft switching techniques in dcdc boost. Softswitching topologies for psfb dcdc converter with. The alternative, soft switching, significantly reduces these switching losses. Priceperformance series, suitable for hard and soft switching. Study of soft switching techniques on threelevel threephase fourwire active power filters by iokeong lok a thesis submitted in partial fulfillment of the requirements for the degree of master of science in electrical and electronics engineering faculty of science and technology university of macau 2010. This chapter covers the basic technology of resonant and soft switching converters.
As compared to gen1 module, the gen2 softswitching module demonstrates. Hence soft switching psfb pwm converters can be classified fig. Softswitching pwm fullbridge converters have been widely used in mediumtohigh power dcdc conversions for topological simplicity, easy control and high efficiency. A currentsource sinewave voltage inverter for converting a direct current dc voltage to an alternating ac voltage includes a dc source for providing a dc voltage, a current source circuit having a primary side inductance of a transformer, a clamping circuit, an inverting circuit, and a control and driving circuit. Various forms of soft switching techniques such as zvs, zcs, voltage clamping, and zerovoltage transition methods are. Techniques that ensure that this happens are referred to as softswitching techniques in the power electronics literature and there are two types. Ecen 5817 resonant and soft switching techniques in power electronics instructor. Isense intelligent sensors that pinpoint time and duration of voltage sags. There can be many ways to classify soft switching techniques, but here only psfb topologies have been considered. Soft switched svpwm controlled prdcl inverter sciencedirect.
Apeldoorn this material is published in order to provide access to research results of the power electronic systems laboratory ditet eth zurich. Softswitching converters also provide an effective solution to suppress emi and have been applied to dcdc, acdc, and dcac converters. The corresponding softswitching technique proposed in this invention is called pseudo inductive softswitching technique, 0028 the invention also provides a method of ensuring that there is a threshold current for enabling softswitching in the event, for example, of the load acting as a shortcircuit using an auxiliary resonant load. Softswitching techniques for mediumvoltage isolated bidirectional dcdc converters in solid state transformers g. Soft switching techniques for mediumvoltage isolated bidirectional dcdc converters in solid state transformers g. A number of experimental converters are breadboarded to verify the theoretical analysis. Resonant and softswitching techniques in power electronics. Moreover, large dvdt and didt produce electromagnetic interference. Advanced soft switching inverter for reducing switching and. Compared to conventional hard switching boost converter this circuit has better efficiency of about 96%. Types of switching techniques there are basically three types of switching methods are made available. To minimize the problems associated with the highswitching frequencies of power converters, several softswitching techniques have been developed.
Techniques that ensure that this happens are referred to as soft switching techniques in the power electronics literature and there are two types. Both the zvtpwm and zctpwm techniques use the concept of shunt resonant network to achieve softswitching. Single phase soft switching techniques power factor. This book intends to describe systematically the softswitching techniques for pulsewidth modulation pwm fullbridge converters, including the topologies, control and design, and it reveals the relationship among the various topologies and pwm strategies previously proposed by other researchers. Pdf coupledfilterinductor softswitching techniques. When a dedicated path is established for data transmission between sender and receiver, it is called circuit switching. Thepwmconvenersproarrpowerbyingthe power now by r of abrupf. Selecting a path that data must take out of the available options is called switching. The principle of soft switching is to switch the power components when the voltage or current is near zero in semiconductor. However, higher switching frequency causes lots of periodic losses at turn on and turn off, resulting in increasing losses of the whole system. This transfer of data takes place over the computer network over which the data travels smoothly.
Although numerous softswitching inverter techniques were claimed to improve the inverter performance, compared with the conventional hardswitching inverter, there is the lack of comprehensive investigations of analyzing and evaluating the performance of softswitching inverters. This thesis deals with the soft switching techniques applied to multilevel inverters for high frequency high voltage and high power conversion. The purpose of the soft switching method is to increase the power density of the circuit. Currently download assets are not available for softswitching technologies. Soft switching shows 10db emi reduction across entire frequency range and 20db reduction between 3 and 6mhz gen2 softswitching module can be cooled by either air or liquid. To incorporate a softswitching cell with a flybacktype, the power switches can achieve zerovoltageswitching zvs and zerocurrentswitching zcs features under turnon. Like its traditional counterparts it connects telephone calls between subscribers or other. Comparison of basic soft switching techniques in dcdc. Softswitching techniques for pulsewidthmodulated converters hua, guichao on. Methods of battery charging with buck converter using soft.
The soft switched boost power factor correction converter has merits of less voltage and current stresses, improved efficiency and reduced switching losses. To reduce the switching losses zero current switching and zero voltage switching are adopted. What is softswitching switching transitions occur under favorable conditions device voltage or current is zero reduced switching losses, switch stress, possibly low emi, easier thermal management a must for very high frequency operation, also medium frequency at high power levels. Softswitching pwm techniques and their applications power. A softswitch software switch is a call switching node in a telecommunications network, based not on the specialized switching hardware of the traditional telephone exchange, but implemented in software running on a generalpurpose computing platform. Early works on soft switching pwm fullbridge converter by many researchers included various topologies and modulation strategies. A softswitching sepic with multioutput sources mdpi. Softswitching techniques for power inverter legs cao. Analysis and study between two soft switching techniques. An overview of softswitching techniques for pwm converters. Softswitching pwm fullbridge converters by xinbo ruan.
Erickson and maksimovic, fundamentals of power electronics, second edition, chapters 19 and 20 extensive supplementary notes and chapters on the course web site. Like its traditional counterparts it connects telephone calls between subscribers or other switching systems across a telecommunication network. The main motive to design this paper to comparative study between two soft switching techniques used in boost converter. Reference 2 proposes soft switching boost converter with hi bridge auxiliary resonant circuit.