This operating mode can replace pwm operating mode in llc, which can improve efficiency signficantly in light load. Optimal design of digital control system for llc resonant. Simulation of the llc resonant converter is performed in matlab. The llc converter is implemented with a fullbridge on the primary side and a fu lbridge rectifier on the secondary side. This example circuit uses scripting to determine the minimum magnetics ratio of magnetizingresonant, ln lmlr, to provide the desired gain and output power of an llc resonant converter. Initially, the calculation of main circuit components is done. 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. We adopt the full bridge llc topology to get the high efficiency and suitable cost. Llc converter has several desired features such as high efficiency, low electromagnetic interference emi and high power density. The tidm02002 clllc resonant dual active bridge dab with bidirectional power flow capability and soft switching characteristics is a reference design from texas instruments designed for hybrid electric vehicleelectric vehicle onboard chargers and energy storage applications. Design of metal mumps based llc resonant converter for.
The fan7688 u60 is a current mode advanced llc controller. Their advantages over those of pulsewidth modulated pwm dcdc converters have led to the invention of several topologies over the traditional forms of these converters. 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. Microchips 200w dcdc llc resonant converter reference design. In addition, to enhance the outcome of a control system, several improved techniques through adaptive controls had been reported 25, which include the passivitybased.
Unlike the slr converter, the llc converter can keep the output voltage regulated even under light load condition. This theoretical analysis had been verified with simulation work. Performance analysis of pulse analog control schemes for. The stevaldpsllck1 is a digitally controlled 3 kw full bridge llc resonant dcdc converter with output synchronous rectification. Ice1hs01g1 resonant mode converter, housed in a dso8 package, is an easytodesign component to realise a llc hb resonant application. It feeds the resonant llc tank that filters out harmonics providing a sinusoidal like voltage and current waveform. Tida00381 360w phase shift full bridge resonant llc with. This reference design is implemented using a single dspic33ep dspic33fj gs digitalpower dscs from microchip that provides the full digital. The addition of digital control for an llc resonant converter is shown in fig. The llc resonant circuit reduces switching loss through zerovoltage switching zvs. The proposed converter consisted of one llc resonant tank, two boost circuits and one shared inductor. I say this because the q is lower for a given load when a full bridge llc is used. Design and analysis of llc resonant converter for pv.
Design and experimental evaluation of a singlestage acdc. When designing a halfbridge llc, the resonant capacitor can be split between the. Zero voltage switching zvs for dc converter matlab. Javascript must be enabled to view full functionality of our site. The circuit is simulated using psim software and the output voltage is regulated with the help of pi controller as a feedback path. Isolated halfbridge 250 w1 kw fullbridge 1 kw flyback. Llc resonant converters increase efficiency in dctodc. Learn more about simulation of fullbridge llc resonant converter. The circuit topology selection depends on many parameters like output power, input voltage, outputinput voltage ratio, and so on.
Twophase interleaved llc resonant converter design with c2000 microcontrollers software determines that the current has fallen down below the phase shedding threshold, it initiates a gradual shutdown of one of the two phases. This llc converter converts a 380v dc input to a 24v output at 120w. The power supply employs full bridge resonant llc with phase shift operating at ramp up, light load, low output voltage. The resonant tank gain can be derived by analyzing the equivalent resonant circuit. Llc resonant converter 12v600w prd1486 topology and circuit description this application note consists of adp1046athe in an isolated dcdc switching power supply that is llc resonant topology with synchronous rectification the circuit is designed to provide a rate. This fixed frequency synchronous buck converter is taken from the simplis tutorial. This reference design demonstrates the implementation of a llc resonant converter using mc56f83783 or mc56f82748 digital signal controllers dsc. Twophase interleaved llc resonant converter design with. The llc resonant converter has been widely used in the electric vehicle charger, server power supply, and uninterrupted power supply conditions for its advantages, such as isolation, adjustable voltage, soft switching, high switching frequency, and high efficiency 1,2. The converter output voltage is regulated using a pi regulator. Figure 1 shows a variable input, variable output llc converter system.
Secondary side pfm controller for llc resonant converter with synchronous rectifier control. The converter consists of a switching bridge halfbridge mosfet, an llc resonant circuit, a fullbridge rectifier and an output filter co. The topologies commonly used in the highvoltage end of the llc resonant converter are the half bridge and full bridge, whereas those used in the lowvoltage end are the full bridge or center tap. While this method works well, it produces two negative side. The ac side of the hbridge is connected to the primary side of a high frequency transformer via a seriesconnected resonant inductor and capacitor. The llc converter is a dcdc converter with a front end hbridge. Llc resonant converter half bridge circuit diagram. Stevaldpsllck1 3 kw full bridge llc resonant digital. In the ideal case, the resonant inductance, resonant capacitance, and magnetizing inductance operate together to achieve. Resonant dcdc converters play an important role in applications that operate at highfrequencies hf. What is the best software for simulation of power electronic projects.
Design of llc converter as start up power supply for. Phaseshifted full bridge dcdc power converter design guide. The first converter presented is a threephase lcctype dcdc resonant converter with capacitor output filter. The system continues to operate normally during this time. Full bridge dc dc converter with planar transformer and. Simulation of fullbridge llc resonant converter matlab.
The soft switching technique and topology solves the problem associated with power utilization within the fila. An oscillator is builtin allowing designers to set the suitable operation frequency range with a resistor. Microsemis resonant mode llc halfbridge controllers offer higher efficiency, power density and component density than possibly achievable with switching regulators, and with considerable lower noise. In these applications, the llc converter is widely used as the dcdc converter following a power factor correction pfc circuit in an acdc system. Getting started with open broadcaster software obs. This paper provides a detailed practical design aspect of full bridge llc resonant converter. This paper presents design and experimental evaluation of a singlestage acdc converter with pfc and hybrid fullbridge rectifier for supplying led streetlight. Resonant converter drivers are designed to adjust the switching frequency of the halfbridge to regulate the output. Proper selection of these two factors is the key point for the llc resonant converter design. Modeling and simulation of fullbridge series resonant. Hello, supposing that one has a wide output voltage range, then is it better to use a full bridge llc converter than a half bridge llc converter. Infineon ice2hs01g is a high performance resonant mode controller designed especially for high efficiency halfbridge or fullbridge llc resonant converter. With the designed values of llc resonant dcdc converter, the closed loop configuration with pulse analog control schemes like ppm and pwm are designed and presented with psim 6.
Converter gain switching bridge gainresonant tank gain transformer turn ratio nsnp where the switching bridge gain is1for a fullbridge and 0. Digital control of llc resonant based dcdc conver youtube. Their selection will impact these converter characteristics. The main topology of the power supply is realized as fullbridge resonant llc converter in connection with twophase interleaved pfc converter. And that surely means that the full bridge llc can manage a wider output voltage range. Additionally, selecting an appropriate llc resonant converter architecture can further optimize the e ciency and reduce component stress 911. This design represents one that could be specified for telecom circuits. However, designing such converters presents many challenges. The dcdc llc resonant converter reference design utilizes microchips digital power conversion dspic for unique adaptive control of the halfbridge converter and synchronous rectifier. In addition, ice1hs01g1 offers a programmed softstart function to limit both the inrush current and the overshoot in output voltage. Simulink and the practical prototype setup is analyzed in proteus software. Llc resonant mode controller infineon technologies.
A simple design and simulation of full bridge llc resonant. Design considerations for a half bridge llc resonant. Highfrequency llc resonant converter with gan devices. The magnetizing inductance of the transformer, along with the inductor and capacitor, form the llc resonant tank.
The llc converter is a dcdc converter based on a resonant circuit which allows softswitching operation. In this paper half bridge llc converter is designed for the output voltage range of 15v20v for a leadacid battery with the input range of 30v. Llc resonant converter for battery charging application. Threephase highfrequency transformer isolated soft. Tis power seminar, designing an llc resonant halfbridge power converter, 2 discusses how to leverage the flexible and programmable nature of a digital controller to implement dynamic mode switching between pwm and fm to achieve these features. Theoretical values of resonant component values are calculated using the design equations. The llc converter is a resonant inverter with 3 reactive elements where dc input voltage is turned into a. Simulation results are provided for llc resonant converter for an input voltage of 33v. Application note an1160 design of resonant half bridge converter using irs27951,2 control ic by helen ding table of contents 1. This thesis presents the analysis, design, simulation and experimental results of threephase highfrequency transformer isolated resonant converters. A costeffective design and analysis of full bridge llc resonant. Next, we will take a look at the resident and shim inductors used in each topology.
The converter uses a nonlinear saturating inductor and a 3 pole, 2 zero compensator with all compensator values calculated in the f11 window. In section ii operation of llc resonant converter is discussed. The switching topology used for the full bridge converter is the bipolar voltage switching, where. The purpose of this project is to design an isolated dcdc converter for hev application, a. I want to simulate the fullbridge llc resonant circuit. This paper presents theoretical analysis characteristics and optimal design procedure of halfbridge llc loaded resonant converter. Designing an llc resonant halfbridge power converter article. Im using resonant converter controller ic by modifiying 2 gate pulses to 4 pulses.
Zvs zero voltage switching to reduce switching loss, improve efficiency, reduction in heating loss, resonant tank, download psim software. The converter consists of a switching bridge half bridge mosfet, an llc resonant circuit, a full bridge rectifier and an output filter co. Operation and design 4 application note an 201209 v1. What are the challenges in full bridge llc resonant converter. However, one can achieve better operating efficiency of the overall system by using a lowcost microcontroller to adjust the frequency, duty cycle and deadband. For more details, see the application note understanding. The output of the regulator is the switching frequency fs which will keep the converter output voltage at. Zvs auxiliary circuit for a 10 kw unregulated llc fullbridge. Where the switching bridge gain is 1 for a fullbridge and 0. Digital control provides llc performance enhancements. Drm119, llc resonant acdc switchedmode power supply.
The full bridge resonant converter voltage had been regulated through the phase shift control. The design procedure of full bridge llc resonant converter is presented for photovoltaic application. The influence of parasitic components on llc resonant. This design illustrates control of this power topology using a c2000 mcu in closed voltage and closed current. Needed operating frequency range for output voltage regulation. Design of llc resonant dcdc converter in closed loop configuration with pulse analog control schemes. The kit consists of a power board, digital control board, adapter board, and firmware modules. Phase shifted full bridge vs full bridge llc video.
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