Rapiddesign lcc currentoutput resonantconverters with. The proposed modeling, multiobjective optimization and control design are not only suitable for the lcc resonant converter applied in vlf hv generator application, but also appropriate for other applications using resonant converters, such as high voltage xray generator, dc. A novel design of llc resonant converter for wide output voltage range thulasi k, l sahaya senthamil, k arul jeyaraj, v. The converter consists of a switching bridge halfbridge mosfet, an llc resonant circuit, a fullbridge rectifier and an output filter co. The major variables used in the hvllc project used to control and monitor the halfbridge llc resonant dcdc converter with synchronous rectification are listed below in table 2 along with brief descriptions of each. Introduction smartctrl1 is a generalpurpose controller design software specifically for power electronics application. 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. The most popular member of three part tanks is the llc resonant converter. Analysis and design of resonant dcdc converters for. The overall design is also simulated using psim software to verify the. The pwm is created with the help of sinusoidal signal and reference signal. Design consideration of llc resonant converter for. Schematic and basic waveforms for hb llc converter operating at resonant frequency.
With a proper design of the magnetic component, l s can be integrated within the transformer with. A new approach of control system design for llc resonant. Optimal design of digital control system for llc resonant converter. Due to the incorporation of lc based resonant circuit in conventional buck converter the. However, it comes at the cost of increased number of components and reduced efficiency and reliability. Designing an llc resonant halfbridge power converter article. Quasiresonant operation enables soft switching and helps to keep the emi low.
Resonant llc halfbridge dcdc converter software design guide. This document aims to simplify this task, and make it easier to optimally design the resonant tank. Resonant converter design 3 resonant converter design tutorial v2. Also, how to apply the somewhat complex llc design methods to. Embedded control of lcl resonant converter analysis.
Analysis and design optimization of resonant dcdc converters by xiang fang b. Design of a novel apwm halfbridge dcdc resonant converter with loadindependent softswitching and reduced circulating current in this paper, a novel cell voltage equalizer using a series lc resonant converter topology is proposed for a series. The model simulation of resonant converter is carried out and implemented by utilizing the matlabsimulink software using the factors enlisted in table 1. Analysis and design optimization of resonant dcdc converters.
Embedded control of lcl resonant converter analysis, design, simulation and. One of the novel types of converters are lclcl converter based on llc resonant scheme, and lctlc inverter consists of dcdc buck converter, lclc resonant filter and hf transformer. Besides design information and documentation of the llc converter, the. We have used embedded based triggering circuit and the embedded c program is checked in keil software. The resonant components design of the multiresonant converter can be simplified using matlab software. The pmp20795 reference design uses ucc256301 enhanced llc controller with integrated driver to provide 24v12a output from a nominal. For example, if fsw is 300 khz, why should resonant frequency be around 30khz. High efficiency and high power density 1kw resonant. Operation and design 4 application note an 201209 v1. Modeling, optimization and control design for lcc resonant. Power electronics resonant switching tutorialspoint. Design of a 600 w hb llc converter using 600 v coolmos p6. The proposed converter is simulated using psim software and pi controller is used to obtain a constant output voltage. Llc resonant converter for battery charging application.
A seriesparallel resonant converter for electrochemical wastewater treatment kathryn m. This design article will describe quasiresonant flyback and buck converters showing how they improve power supply efficiency. Abstractthis paper presents the study, analysis, design implementation and simulation of ltype zero current switching zcs resonant buck converter and also practically implemented in hardware. The technique of zero voltage switching in modern power conversion is explored. The design of the lcc resonant converter shown in fig. Secondary lc filter analysis and design techniques for. Typically, optocoupler and resistor are connected to this pin to regulate the output voltage.
Resonantreset forward converter design singleswitch resonantreset forward converters are characterized by the absence of a reset winding figure 1b. Lc resonant converter has been widely used due to its high efficiency and zero voltage switching zvs on the primary side. Design and hardware implementation of ltype resonant. Here then, a design procedure is proposed that assunmes the converter is operated about a specified resonant frequency for a given load and gain. Resonant converters contain resonant lc networks whose voltage and current. The principle of quasiresonant conversion is to reduce the turn on losses of the power switch in a topology. The zcspushpull resonant converter the converter works as follows. During the off time, the transformer resets without loss through a resonant circuit that consists of. A halfbridge llc resonant converter with zero voltage switching zvs and pulse frequency modulation.
Several zvs topologies and applications, limitations of the zvs technique, and a generalized design procedure are featured. If you are a student or educator, enter your university name. In a resonantswitch converter, reactive elements capacitors and inductors are added around the switch to generate the sinusoidal voltage or current. 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. Software equipment for microscope video acquisition and image processing. Two and threeelement resonant converter fundamentals. An1477 ds01477apage 2 2012 microchip technology inc. The pmp20637 power stage has over 140win3 power density. Ac analysis of resonant converters using pspice a quicker. This paper presents a novel design methodology for the standard. First, the design of the power stage of llc converter is being described. Secondary lc filter analysis and design techniques for currentmodecontrolled converters. This document provides an overview of llc converter operation and design guidelines.
Resonant llc halfbridge dcdc converter software design. In section vi, resonant converter design challenges and the effects of real life. Introduction main task of power semiconductor converter is transfer of electrical energy from. This example circuit uses scripting to determine the minimum magnetics ratio of magnetizing resonant, ln lmlr, to provide the desired gain and output power of an llc resonant converter. I am guessing it is due to voltage spikes at resonance, but cant it be just twice, if thats the case. In each of the design examples, the smallsignal analysis was performed using easy5 software and. An1477, digital compensator design for llc resonant. In a softswitching converter, switching occurs when voltage andor current values are zero, thus significantly improving converters efficiency. Llc resonant converters increase efficiency in dctodc. The llc resonant circuit reduces switching loss through zerovoltage switching zvs.
This reference design is a high efficiency, high power density and light weight resonant converter reference design. The llc converter is a dcdc converter based on a resonant circuit which allows softswitching operation. A novel design of llc resonant converter for wide output. With fixed 950khz switching frequency in steady state, 97. In an asymmetrical pulsewidthmodulated halfbridge apwm hb series resonant converter, an auxiliary lc network is provided for ensuring zerovoltage switching zvs over a wide range of line and load variations.
It is one of the most efficient solution for designing wide output voltage switchedmode. Rajasekaran abstract the llc resonant converter has been widely used as a dcdc converter. Why do we set resonant frequency of lc circuit in a buck converter to be less than 10% of fsw. Tsinghua university, 2007 a dissertation submitted in partial fulfillment of the requirements for the degree of doctor of philosophy in the department of electrical engineering and computer science in the college of engineering and computer science. When an inductor or capacitor are placed in series or parallel they will have a resonant frequency which is determined by the design equation below. Unlike the slr converter, the llc converter can keep the output voltage regulated even under light. Electrolytic hydrogen offers a promising alternative for longterm energy. Hardware, software and systems described in this document are. This ic can be designed easily because it includes the. Pdf resonant converters which are designed without considering parasitic.
The resonant switching topology is, to date, one of the most efficient solutions for switch mode power supply design. A decomposed llc resonant converter is shown below for better understanding of resonant converter composition. Digital control of llc resonant based dcdc conver iftikhar abid. An ebook reader can be a software application for use on a computer such as microsofts free reader application, or a booksized computer that is used solely as a reading device such as nuvomedias rocket ebook. The three main classes of resonant converters are series resonant converter src, parallel resonant converter prc and a combination of the two, the seriesparallel resonant converter sprc. Optimal design of digital control system for llc resonant. Zvszcs, switching frequency, resonant converter, electromagnetic. Prc topology besides the two part resonant tanks, there are almost 40 possibilities of three part resonant tanks.
Vorperian and slobodan cuk california institute of technology pasadena, california abstract the. Finally the simulation of whole system has been done by psim software. A full bridge isolated version of the parallel resonant converter is given in fig. Lc impedance matching network designer enter the input and output impedances to be matched and the centre frequency. Ananlysis and design of llc resonant converterananlysis. Unlike the slr converter, the llc converter can keep the output voltage regulated even under light load condition. Pdf design of a parallel resonant power converter considering. Assume an initial condition of the voltage vc across c equal to zero. Digital control of llc resonant based dcdc conver youtube. The converter differs from the series resonant converter because it is the tank capacitor voltage, rather than the tank inductor current, which.
Analysis and design of apwm halfbridge series resonant. The technique of resonant converters is described below giving the zcspushpull resonant converter as an example. The pulses generated are adjusted by the pi controller. Enter in any two parameters for a resonant circuit. Output voltage control can be achieved by varying the frequency. Llc resonant converter for battery charging application 385 v. The series load resonant converter is a dcdc converter based on a resonant circuit which allows softswitching operation. The series connected lc, along with an inductor in parallel with the output port, form the llc resonant tank. Keywordsresonant converter, simulation, ac analysis i. The aim is to provide a converter design to reduce tank.
Llc resonant converter design using mc56f82748, design reference manual, rev. A dc voltage source with halfbridge switches is used for the llc switch network. Sections ii through v provide a thorough understanding of resonant converter topologies and analysis. Using llc resonant converter for designing widerange. Exploring quasiresonant converters for power supplies. Values for l and c will be calculated for the four topologies shown. S g srivani 2 1pg student, dept of electrical and electrical engineering, rv college of engineering, bangalore, karnataka, 560059, india.
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. Bm2scq124tlbz is a quasiresonant acdc converter that provides an optimum system for all products which has an electrical outlet. The resonant frequencies and damping coefficients of the second filter are derived, and design guidelines are given. Digital compensator design for llc resonant converter. An4151 halfbridge llc resonant converter design using fsfr. Automated design of a highpower highfrequency lcc resonant.
Lc resonant circuits are useful as notch filters or band pass filters. Resonant frequency of lc circuit in switching converter. Ananlysis and design of llc resonant converterananlysis and design of llc resonant converter lokesha m h 1, dr. Design consideration of llc resonant converter for electrolyser p. Resonant circuits and soft switching toshiba electronic devices. The aim is to provide a converter design to reduce tank currentsin general one would use the design procedure and ultinmately operate slightly above resonance, the gain at resonance has therefore to be slightly larger than required. This tutorial is intended to guide you, step by step, to export.
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