Resonant power convertersespecially those with an llc halfbridge configurationare receiving renewed interest because of this trend and the potential of these converters to achieve both higher switching frequencies and lower switching losses. Apr, 20 parallel resonant inverter is dual of series resonant inverter current is continuously controlled, that gives better short circuit protection under fault condition 420 7 8. The converter differs from the series resonant converter because it is the tank capacitor voltage, rather than the tank inductor current, which is rectified and filtered to produce the dc load voltage. Resonant power converters have many applications in the computer industry, telecommunications and in industrial electronics. Unfortunately, the rest goes to losses in power conversion, distribution and cooling 5.
The series resonant dc dc power converter is one of the most promising soft switching topologies with the potential to replace pwm converters in medium to high power dc applications. Designing an llc resonant halfbridge power converter article. Power electronics resonant switching resonant switch converters refers to converters that have inductor and capacitor lc networks and whose current and voltage waveforms vary in a sinusoidal man. Capacitor c2 is a 10nf 2kv wima fkp1 surge protection capacitor with 68pf 600v polystyrene capacitor in parallel. Kazimierczuk wright state university dariusz czarkowski polytechnic institute of new york university. This thesis proposes a novel resonant switchedcapacitor converter using multiple resonant frequencies to. The output power and the efficiency of all the three resonant converters were calculated. Llc resonant converters increase efficiency in dctodc applications. It has low switching losses, yielding a high efficiency of more than 95%. This technology can achieve significantly higher efficiency and power density than the current stateof theart and has the potential to greatly reduce the power distribution loss in future.
And8296d increasing low power converter efficiency with. And while true, two obvious concerns can impede the quest for high efficiency operation with high voltage inputs. Micromechanical resonant switches resoswitches and resonant power converters by yang lin doctor of philosophy in electrical engineering and computer sciences university of california, berkeley professor clark t. The series and parallel resonant converters, and zerovoltage switching 4. Analysis and comparison of power electronic converters for.
Bordry cern, geneva, switzerland abstract this paper introduces power conversion principles and defines the terminology. Among resonant converters, two basic types are the series resonant converter src, shown in fig. In theory, the onoff transitions occur at a time in the resonant cycle where the switch current is zero, facilitat3329 ing zero current, hence zero power switching. And9408 basic principles of llc resonant half bridge converter. It is a practical, systematic guide to the analysis and design of various dcdc resonant inverters, highfrequency rectifiers, and dcdc resonant converters that are building blocks of many of todays highfrequency energy processors. Much of the calculation was aided by calculative spreadsheets and matlab scripts generating solution arrays. This paper presents the principles of resonant power converters rpcs and their classifications based on their dcdc converter family, and ability to achieve soft switching.
Dec 17, 2016 an intuitive explanation of the basics of resonant converters and elements of their analysis and design including some aspects of soft switching. Pdf analysis of high voltage high power resonant converters. Thus, a mechanism exists for controlling the proximity to the resonant. Middlebrook power electronics group california institute of technology abstract quasi resonant converters are a recently introduced family of singleswitch resonant converters featuring zerocurrent or zerovoltage switching. It feeds the resonant llc tank that filters out harmonics providing a sinusoidal like voltage and current waveform. The concepts of sources and switches are defined and classified. Their advantage over traditional converters lies in their ability to transform power at very high frequencies. Digital control offers design flexibility, high performance and high reliability. The purpose of this research is to suggest the application guideline for the inverter systems for csrm and tsrm, both 6sw and 12sw mode. Introduction to resonant conversion resonant power converters contain resonant lc networks whose voltage and current waveforms vary sinusoidally during one or more subintervals of each switching period.
Resonant power converters marian kazimierczuk, dariusz. Several recent research trends have focused on the development of their constructions, operational principles, merits and demerits. The demands on power supplies have increased in recent years, which have resulted in the adoption of digital control as the latest trend in actodc and dctodc power conversion applications. Nguyen, chair micromechanical resonant switches resoswitches that harness the qhigh resonance. An intuitive explanation of the basics of resonant converters and elements of their analysis and design including some aspects of soft switching. The llc converter is a resonant inverter with 3 reactive elements where dc input voltage is turned into a square wave by a switch network arranged as either a half or fullbridge. Power electronics resonant switching tutorialspoint. From the basic laws of source interconnections, a generic method.
The required power electronic silicon material volume is also compared among different converters. Resonant half bridge converter and dcdynamic circuit simulation examples introduction llc resonant half bridge converters are widely used in consumer electronics, like powering the display panel of lcd tv. Resonant power converters with respect to passive storage lc. Micromechanical resonant switches resoswitches and. Industry members look into increasing backplane voltage from 12v to 48v in order to reduce distribution loss. The first book devoted exclusively to resonant energy conversion, resonant power converters is a practical, systematic guide to the analysis and design of the various dcac resonant inverters, highfrequency rectifiers, and dcdc resonant converters that are the building blocks of many of todays highfrequency energy processors.
Resonant mode converter topologiesadditional topics bob mammano introduction in the 198889 series of unitrode power supply design seminars, a basic tutorial on resonant mode power supply topologies was presented to describe the many circuit configurations possible and attempt to show how. Energy star efficiency requirements for power conversion equipment are pretty much becoming. Resonant converters university of nevada, las vegas. Increasing low power converter efficiency with resonant snubbers prepared by. The llc converter is a resonant inverter with three reactive elements where the dc input voltage is turned into a square wave by a switch network arranged as either a half or fullbridge to feed the resonant llc tank that effectively filters out harmonics providing a sinusoidal like voltage and current waveform. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed. Simple frequencydomain modeling of resonant converters with the fundamental approximation 3. Analysis of selfoscillating dcdc resonant power converters. However, the operating principles of a llc resonant half bridge converter are far from apparent and intuitive 1. Energy circulates in the resonant circuit, and some or all of it is then tapped off to supply the output. There are a number of approaches to inducing selfoscillation in a resonant converter. Designed to function as both a superior seniortograduate level textbook for electrical. Micromechanical resonant switches resoswitches that harness the highq resonance and nonlinear dynamical properties of micromechanical structures are demonstrated that can achieve higher switching speed, better reliability even under hot switching, and lower actuation voltage, all by substantial factors, over existing rf mems switches. Operation and design 4 application note an 201209 v1.
However, designing such converters presents many challenges, among them the fact that the llc. With the results, it has been proved that lcc resonant converters were very much suited to give an output. Micromechanical resonant switches resoswitches and resonant. These sinusoidal variations are large in magnitude, and the small ripple approximation does not apply. Analysis of selfoscillating dcdc resonant power converters using a hysteretic relay david r. Although these features may make the parallel resonant converter illsuited to some conventional power supply applications, they can be used to advantage in others. More detailed descriptions and discussions can be found in this topics references. Frank cathell on semiconductor introduction with energy requirements and costs constantly increasing, the demand for efficient power supplies obviously increases. This book is devoted to resonant energy conversion in power electronics. Abandoned application number us12448,541 inventor denis john cody peter.
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