In this paper, an llc resonant converter for driving multiple led lights using the current balancing of a capacitor and transformer is proposed. Resonant converter operation minimizes losses resulting in lower component. Llc board is targeting large lcd backlight applications. The led driver should have the capability of providing constant current. Output voltage ripple reduction with noise spectrum spread. Modelling of 200w led driver circuit design with llc converter. Synchronous rectifier reduces conduction loss in llc. Mouser electronics is a worldwide market leader in the catalog distribution sales of semiconductor light source devices known as light emitting diodes leds and their associated lighting components which are used to support the newest and most advanced led based designs. But the efficiency of llc resonant converter is low under the pfm control. Llc resonant converter burst mode control with constant burst time and optimal switching pattern. Highfrequency llc resonant converter with gan devices and. Home products power management led drivers acdc led drivers. Design considerations and experimental results are presented for a 200w led driver prototype which.
Llc a delaware limited liability company dba on semiconductor having its. For more details, see the application note understanding. Multichannel constant current mc 3 llc resonant led driver. 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. Find resonant converter related suppliers, manufacturers, products and specifications on globalspec a trusted source of resonant converter information. Dutyratiocontrolaided drca llc converter for current balancing of twochannel light emitting diode led driver is proposed and analyzed. The l6699 is a doubleended controller specific to seriesresonant half bridge topology. Figure 2 shows a block diagram for this new topology, which includes only two stages with pfc and multitransformer llc converter. 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. The operating frequency range of the llc pfc is defined as fp. The llc resonant converter is based on the series resonant converter src. In this paper, a multichannel constant current mc 3 llc resonant led driver is proposed.
In 37 an led driver with cll resonant converter has been proposed that primary side switches can turn on in zvs mode, thus the efficiency improved drastically. Analysis and design of resonant dcdc converters for. Operation and design 4 application note an 201209 v1. Llc led driver design simplified electronic products. A mathematical guideline for designing an acdc llc. As for the dcdc part in higheffiency led driver with constant current output, this paper presents the circuit based on llc resonant topology. The llc converter is controlled to operate as a constant current mode led driver.
It consists of a twostage system with a frontend pfc powerfactorcorrection stage followed by a resonant isolation and stepdown stage with a rectifier and filter at the output. An9729 led application design guide using halfbridge llc. Half bridge llc resonant converter design using ice1hs01g application note 12 august 2009 5 1 introduction this application note describes how to design half bridge llc resonant converter using ice1hs01g, which is an 8pin llc controller developed by infineon technologies. Llc series resonant converter based led lamp driver with zvs. A 100 khz, 200w llc led driver is designed and calculated to verify the proposed circuit and design method.
Ucc25710 98wllc resonant halfbridge 4stringled driver. The resonant hb converter supports both llc and lcc topologies with fixed or variable switching frequency control for highest efficiency, and. Optimal trajectory control of llc resonant converters for. Commercial industrial led lighting drivers tolerance, allowing. Multichannel led driver with cll resonant converter. Compared to conventional high wattage 100w led lighting driver with acdc plus multiple constant current dcdc converter stages, the new topology can have higher efficiency and lower system cost. A new offline led lighting driver solution with multi. In this paper, a novel pwm dimming solution with the optimal trajectory control for a multichannel constant current mc 3 llc resonant led driver is proposed. This application note describes the led driving system using a halfbridge llc resonant converter for high power led lighting applications, such as outdoor or. Llc evaluation board that includes an llc resonant converter and led driver circuitry. This paper presents a singlestage light emitting diode led driver based on a bridgeless power factor correction pfc converter and a halfbridge clcl resonant converter, for street lighting. Pdf design of half bridge llc resonant converter for low. Highvoltage resonant controller with pfc for led drivers.
An introduction to llc resonant halfbridge converter. Ucc25710 98w llc resonant halfbridge 4string led driver. An advanced hybrid llc series resonant converter with united flyingcapacitor cell is proposed in this paper to permit the high stepdown conversion in the high input voltage applications. Resonant converter operation minimizes losses resulting in lower component temperatures and smaller cases. Statetrajectory analysis and control of llc resonant converters weiyi feng abstract with the fast development of communication systems, computers and consumer electronics, the power supplies for telecoms, servers, desktops, laptops, flatpanel tvs, led lighting, etc. Led driver based on boost circuit and llc converter ieee xplore. It provides up to 200w constant current or constant voltage output from a universal ac input.
Multichannel constant current mc 3 led driver for indoor led luminaries haoran wu abstract recently, as a promising lighting source, lightemitting diodes leds have become. Llc board is targeting large lcd backlight applications where there is a. A resonant led driver follows the same basic design as a resonant power supply. By employing the multiple transformer structure, one singlestage driver can drive multiple led channels, simplifying the driving scheme and circuit complexity. This paper proposes an llc resonant converter based led light emitting diode lamp driver with high power factor. The proposed circuit uses a boost converter for pfc power factor correction which operates in continuous conduction mode ccm and a quasi. To help meet customer demand and make this digital equipment thinner some manufactures have turned to half bridge llc resonant converters to drive the led. An introduction to llc resonant halfbridge converter introduction 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.
Anps0031 half bridge llc resonant converter design using. The pr oposed converter can drive multi led strings without an individual converter with constant current contro l and dimming control. Offline led drivers for commercial and industrial lighting up to 350 w. A 100w led lighting driver reference design pmp4302a using this multitransformer llc control is developed. When pwm dimming is on, the llc resonant converter operates under the fullload condition. The principle of the llc resonant converter, design process, and the influence of different key parameters to its performance are also prensented. Llc resonant converter transformer design equations led. The inbuilt flyingcapacitor branch in the primary side can. Design on led driver based on llc resonant topology. These advantages enable engineers to achieve high power density. Statetrajectory analysis and control of llc resonant. Design and implementation of 150 w acdc led driver with. Later it will be shown that most of the time an llc converter is designed to operate in the vicinity of f0.
A new offlineled lighting driver solution with multi. The converter uses a nonlinear saturating inductor and a 3 pole, 2 zero compensator with all compensator values calculated in the f11 window. The study analyses the performance of different led circuit configurations feed from a low power resonant driver under pulse quasi. Designing an llc resonant halfbridge power converter article. The converter performances are simultaneously analyzed in correlation with the most. Llc provides a high efficiency power conversion pled pin. In addition, this study also designed and optimized the primary and secondaryside. Synchronous rectifier reduces conduction loss in llc resonant power supplies yong ang, snr applications engineer, diodes incorporated with increasing drive to shrink electronic solutions, the merits of resonant power converters are now attracting increased attention among power supply engineers.
This fixed frequency synchronous buck converter is taken from the simplis tutorial. A singlestage led driver based on double llc resonant tanks for automobile headlight with digital control has been proposed in. Led is a recent technology, which has replaced all other conventional light sources in the past few years and since it is current controlled, accurate driver design is necessary. Ac converter with bidirectional switches and a parallel lc resonant tank. In this study, a secondstage llc resonant converter was proposed for the led driver circuit, and the llc resonant circuit was used as a directcurrent transformer dcx to operate the driver circuit at high e ciency. Resonant hb converter supports both llc and lcc topologies with fixed or variable switching frequency control for highest efficiency and the bm enables the low standby power consumption. The proposed circuit uses a full bridge rectifier to. In a first aspect, an llc resonant converter is provided for driving a plurality of output circuits from a dc input signal.
For a two stage led driver, the first stage is pfc. Lc approximation of a phasecontrolled lc c resonant converter to study the dynamic response as a led lamp driver. A way to simplify the design process in an llc resonant halfbridge led driver that requires dimming is to use a technique called pwm dimming. Llc series resonant converter based led lamp driver with. Multichannel constant current mc led driver for indoor. Offering everything necessary to build a reliable and robust halfbridge resonant converter, the flsxs series simplifies designs and improves productivity, while improving performance.
The highly integrated icl5101 allows for advanced led driver designs with approximately 25% less components compared to similar solutions which require separate pfc and resonant ics. The datasheet andor app note may have some key parameter calculations. However we dont have step by step equations on website. This paper proposes mathematical model of 200w led driver circuit design with llc resonant converter. These productionready led driver designs come with full design infopacks and can be easily customized and optimized. The considered led driver topology is based on a bridgeless single. A high efficiency led driver circuit using llc resonant. Power integrations offers highly integrated power conversion ics that support a wide range of isolated and nonisolated power supply topologies. Highpower ledlighting drivers power systems design. This paper presents the twostage led driving system using llc resonant converter for led lighting application. Redisem led llc converter deliver bestinclass efficiency. Highfrequency llc resonant converter with gan devices. So can we let llc work in the open loop, just use the pfc stage feedback the output current. Redisem llc led drivers have higher efficiency than flyback converters.
Llc board is targeting large lcd backlight applications where there is a need to drive long strings of leds of about 100 v forward voltage directly from a pfc converter output. In a perfect pfc circuit, the input current follows the input. A dimmable led driver for visible light communication. The led intensity is controlled by the ratio between the ontime and offtime of the pwm dimming signal. Pdf this paper presents the twostage led driving system using llc resonant converter for led lighting application. This paper proposes a novel pwm dimming solution with optimal trajectory control for a multichannel constant current mc3 llc resonant led driver. Design and experimental evaluation of a singlestage acdc. The proposed circuit uses a boost converter for pfc power factor correction which operates in continuous conduction mode ccm and a quasi half bridge resonant converter to drive the led lamp load. Ieee journal of emerging and selected topics in power electronics 3 3, 589598, 2015. Us8629627b2 multitransformer llc resonant converter. Due to the existence of the nonisolation dcdc converter to control the led current. The proposed converter achieved a constant voltage and current, which were required to drive high brightness led lamps, but it has high dc bus voltage level and high cost compared to a singlestage acdc converter. The flsxs series of general lighting power controllers includes highly integrated power switches for medium to highpower lumens applications. Citeseerx document details isaac councill, lee giles, pradeep teregowda.
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