Simulation and analysis of llc resonant converter using. Feedback loop design of an llc resonant power converter. Perform ac analysis in psim the frequency response of the plant is obtained from the switch mode form of the resonant converter using psims ac analysis. Power electronics resonant switching tutorialspoint. Xaxis is defined as switching frequency, or better said frequency of input sinusoidal voltage. The converter output voltage is regulated using a pi regulator. Power electronics iii colorado state university by electrical and computer engineering student minh anh thi nguyen page 1 of 27 2.
Us20120294045a1 method and apparatus for controlling. In a qrc, the width and amplitude of the pulse is fixed and the converter is variable frequency i. Analysis and design of quasi square wave resonant converters. A method and apparatus for controlling power conversion.
This book is devoted to resonant energy conversion in power electronics. Modelling and simulation of a resonant converter semantic scholar. Hi, i need a llc sample simulink model, could anybody provide me one. Conduction losses, however, can remnain significant, particularly due to high resonanttank currents, that can occur whenoperating far above the resonant frequency at full load. The operation of mode 2, for the half bridge resonant converter circuit is shown in fig. Us20120294045a1 us475,460 us2012475460a us2012294045a1 us 20120294045 a1 us20120294045 a1 us 20120294045a1 us 2012475460 a us2012475460 a us 2012475460a us 2012294045 a1 us2012294045 a1 us 2012294045a1 authority us united states prior art keywords bridge resonant converter voltage apparatus threshold prior art date 20110519 legal status the. The resonant components design of the multiresonant converter can be simplified using matlab software. The series load resonant converter is a dcdc converter based on a resonant circuit which allows softswitching operation. Although in existence for many years, only recently has the llc resonant converter, in particular in its halfbridge implementation, gained in the popularity it certainly deserves. Below is a plecs demo model of an isolated dcdc resonant converter operated under frequency control. 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. Design and modeling of 200khz 1, 5kw llc power semiconductor. Introduction smartctrl1 is a generalpurpose controller design software specifically for power electronics application.
Two variants of the llc converter are the series resonant converter and the parallel resonant converter. A new approach of control system design for llc resonant. Resonant converter design 3 resonant converter design tutorial v2. This tutorial is intended to guide you, step by step, to export. Experimental results obtained for a resonant converter with resonant frequency fg 35. Feedback loop design of an llc resonant power converter rev. Learn more about version, llc, simulink, examples simulink. This part will be dedicated to the dcdc converter modelling with simulink. Zerovoltage switching zvs is used to reduce switching losses, allowing the operation of. The converter circuit is shown in the figure below. The converter output voltage is regulated using a pi. For complete details on the design of an llc resonant power converter, the recommended reference is sem1900 topic 3, designing an llc resonant halfbridgepower converter. Power electronics ece562 colorado state university modified december 2008 purpose. Chapter 1 resonant converters and constantcurrent power.
Pwm for quasi resonant converter file exchange matlab central. The resonant components design of the multi resonant converter can be simplified using matlab software. Robust performance controller design for dutycycle controlled series resonant converter src is proposed in this paper. Lc resonant converter has been widely used due to its high efficiency and zero voltage switching zvs on the primary side mosfets and zero current switching zcs on the secondary side diodes 1,2. When the fet is then turned on, the element generates a resonant pulse which is then filtered by the output lc like a traditional switching converter. Resonant llc converter example in matlab 2016 matlab. The merits of src include better load efficiency and inherent dc blocking of the isolation transformer due to the series capacitor in the resonant network. The purpose of this lab is to simulate the lcc circuit using capture cis and matlab to better familiarize the. In a softswitching converter, switching occurs when voltage andor current values are zero, thus significantly improving converter s efficiency.
The llc resonant circuit reduces switching loss through zerovoltage switching zvs. The multi resonant converters is the combination of the parallel and serial connections of the resonant circuits. Simulation of lcc resonant circuits power electronics ece562 colorado state university modified december 2008 purpose. Ece 562 half bridge series resonant llc converter nl5 simulation page 2 purpose. The series and parallel resonant converter src and prc respectively circuits are the basic resonant converter topologies with two reactive elements. The quasi resonant converters output voltage is controlled using the switching frequency. A quasiresonant converter qrc works on the basis of using a resonant switching element. The llc resonant converter operates with high power density and high frequency range up to several mhz 12 as it combines the frequencies of src and prc. The llc converter is a dcdc converter based on a resonant circuit which allows softswitching operation. Resonant circuits in matlab mathematics stack exchange. The output of the regulator is the switching frequency fs which will keep the converter output voltage at the desired voltage set point vref.
A bidirectional llc resonant converter with automatic. Secondorder iir peak or resonator filter matlab iirpeak. Smps takes power from the main power lines and transfers it to a load. Control of series resonant converter with robust performance. To push high efficiency and high power density for high output current applicaiton, matrix transformer and flux cancellation are utilized in llc resonant converter. Resonant switching topologies are the next generation of power conversion circuits, when compared to traditional pulse width modulation pwm topologies. Rlc resonant series circuit analysis using matlab youtube. The pwm provided by the matlab library is based on duty cycle controlled. Closed loop controlled llc half bridge isolated series. The resonant power converter is controlled based on the switching frequency. The simulations are based on modeling of a dcdc power converter and simulation of the whole system by using simulink and. In a softswitching converter, switching occurs when voltage andor current values are zero, thus significantly improving converters efficiency. Mathematical modeling, design and analysis of llct series. The purpose of this lab is to simulate the lcc circuit using capture cis and matlab to better familiarize the student with some of its operating characteristics.
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. Aeries resonant converter and b its ideal equivalent circuit. Simulation and analysis of llc resonant converter using closed loop pi controller g. The quasi resonant converter s output voltage is controlled using the switching frequency. The output voltage of the converter is controlled by changing the switching frequency of the semiconductors. Chapters 4,5 and 6 show the original contributions to the subject of llc resonant converter modelling and digitally controlled circuits. This lab will explore some of the following aspects of the lcc resonant converter. The multiresonant converters is the combination of the parallel and serial connections of the resonant circuits. Unlike the slr converter, the llc converter can keep the output voltage regulated even under light load condition. This application note will not repeat the discussion of these details.
The converter differs from the series resonant converter because it is the tank capacitor voltage, rather than the tank inductor current, which. Introduction advances in resonant and quasi resonant power conversion technology propose alterna. This example shows a dcdc llc power converter with frequency control. Ratio between output voltage and input voltage is marked on y axis. For example, a computer while ensuring the voltage and. The converter consists of a switching bridge halfbridge mosfet, an llc resonant circuit, a fullbridge rectifier and an output filter co. Pdf analysis and design of llc resonant converter for fuel cell. Resonant converters and constantcurrent power supplies 3 2 adding active auxiliary circuit e. Unlike the slr converter, the llc converter can keep the output voltage regulated even under light. Control of series resonant converter with robust performance against load and power circuit components uncertainties a.
A seriesparallel resonant converter for electrochemical wastewater treatment kathryn m. Matlab library only provide the pwm with duty cycle, d, as the input. Unlike the slr converter, the llc converter can keep the output voltage. Pwm for quasi resonant converter file exchange matlab. Though it operates at high frequency the switching losses are reduced and provide high efficient llc converter design 1. Choose a web site to get translated content where available and see local events and offers. The ac side of the hbridge is connected to the primary side of a high frequency transformer via a seriesconnected resonant inductor and capacitor. One of the example is the quasi resonant converter. Llc resonant converter which were evaluated for accuracy by my project supervisor, dr.
Jun 17, 2011 matlab simulations of series resonant circuit 564. A full bridge isolated version of the parallel resonant converter is given in fig. In one embodiment, the method comprises computing a voltage ratio based on a voltage conversion in a resonant converter. The llc converter is a dcdc converter with a front end hbridge. The output of the regulator is the switching frequency fs which will keep the converter output voltage at.
Simulink model of the openloop buck converter is shown in figure 6 a. To design the filter, w0 must meet the condition 0. The magnetizing inductance of the transformer, along with the inductor and capacitor, form the llc resonant tank. The resonant switching topology is, to date, one of the most efficient solutions for switch mode power supply design. Closed loop control of llc resonant converter incorporating. An example in section 2 will illustrate the operation and features of a quasiresonant converter.
Resonant converters are wellknown due to their high efficiency. One of the novel types of converters are lclcl converter based on llc resonant scheme, and lctlc inverter consists of dcdc buck. Introduction advances in resonant and quasiresonant power conversion technology propose alterna. Pwm for resonant power converter file exchange matlab.
Mode 2 operation of half bridge resonant converter. Optimal design of digital control system for llc resonant. Analysis and design of resonant dcdc converters for. Figure 1 shows a typical block diagram of an llc resonant converter. If sys is a siso model, then the peak gain is the largest value of the frequency response magnitude if sys is a mimo model, then the peak gain is the largest value of the frequency response 2norm the largest singular value across frequency of sys. This topic concludes with a performance comparison of zvs converters to their square wave counterparts, and a summary of typical applications. This paper deals with digital simulation of fmzcsquasi resonant converter fed dc servo drive using matlab simulink. However, this pwm provide the switching frequency controlled. A new approach of control system design for llc resonant co nverter 325 voltage gain characteristic of proposed converter is shown on fig. The purpose of this lab is to simulate the llc resonant converter using nl5 to better familiarize the student with some of its operating characteristics. Mar 25, 20 to push high efficiency and high power density for high output current applicaiton, matrix transformer and flux cancellation are utilized in llc resonant converter. Rapiddesign lcc currentoutput resonantconverters with.
Operation and design 4 application note an 201209 v1. When the current in both inductors lr and lm are same, this mode ends. Jan 03, 2016 compairing between using calculation and matlab software to find resonant frequency, bandwith and quality factor. The basics a quasi resonant converter qrc works on the basis of using a resonant switching element. It can be seen that the instantaneous voltage vtt applied across the tank circuit is equal to the difference between the switch voltage vst and the rectifier voltage vrt. Subintervals and modes the series resonant converter, fig. Digital simulation of fmzcsquasi resonant converter. It is suitable for power converter that used frequency control for output modulation. An smps switched mode power supply refers to an electronic device that uses a switching regulator for the purpose of converting electrical power in an efficient manner. The purpose of this lab is to simulate the lcc circuit usingmatlab to better familiarize the student with some of its operatingcharacteristics. A bidirectional llc resonant converter with automatic forward and backward mode transition power electronics.
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