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