Power integrations offers highly integrated power conversion ics that support a wide range of isolated and nonisolated power supply topologies. 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. A mathematical guideline for designing an acdc llc. When pwm dimming is on, the llc resonant converter operates under the fullload condition. For more details, see the application note understanding. The datasheet andor app note may have some key parameter calculations. 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. Due to the existence of the nonisolation dcdc converter to control the led current. 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. The llc converter is controlled to operate as a constant current mode led driver. Highfrequency llc resonant converter with gan devices. A dimmable led driver for visible light communication.
In this paper, a multichannel constant current mc 3 llc resonant led driver is proposed. 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. A 100 khz, 200w llc led driver is designed and calculated to verify the proposed circuit and design method. The inbuilt flyingcapacitor branch in the primary side can. Resonant converter operation minimizes losses resulting in lower component. A singlestage led driver based on double llc resonant tanks for automobile headlight with digital control has been proposed in. The proposed circuit uses a boost converter for pfc power factor correction which operates in continuous conduction mode ccm and a quasi. 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. Statetrajectory analysis and control of llc resonant. 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.
Home products power management led drivers acdc led drivers. The pr oposed converter can drive multi led strings without an individual converter with constant current contro l and dimming control. But the efficiency of llc resonant converter is low under the pfm control. These productionready led driver designs come with full design infopacks and can be easily customized and optimized. Llc a delaware limited liability company dba on semiconductor having its. The converter uses a nonlinear saturating inductor and a 3 pole, 2 zero compensator with all compensator values calculated in the f11 window.
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. Design and implementation of 150 w acdc led driver with. Llc resonant converter burst mode control with constant burst time and optimal switching pattern. Offline led drivers for commercial and industrial lighting up to 350 w. 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. 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. As for the dcdc part in higheffiency led driver with constant current output, this paper presents the circuit based on llc resonant topology. These advantages enable engineers to achieve high power density. The llc resonant converter is based on the series resonant converter src. Anps0031 half bridge llc resonant converter design using. Lc approximation of a phasecontrolled lc c resonant converter to study the dynamic response as a led lamp driver. Redisem llc led drivers have higher efficiency than flyback converters.
For a two stage led driver, the first stage is pfc. Ac converter with bidirectional switches and a parallel lc resonant tank. The operating frequency range of the llc pfc is defined as fp. The study analyses the performance of different led circuit configurations feed from a low power resonant driver under pulse quasi. However we dont have step by step equations on website. In a perfect pfc circuit, the input current follows the input. So can we let llc work in the open loop, just use the pfc stage feedback the output current. This paper presents the twostage led driving system using llc resonant converter for led lighting application. Multichannel constant current mc led driver for indoor. The converter performances are simultaneously analyzed in correlation with the most. Figure 2 shows a block diagram for this new topology, which includes only two stages with pfc and multitransformer llc converter. The principle of the llc resonant converter, design process, and the influence of different key parameters to its performance are also prensented. Citeseerx document details isaac councill, lee giles, pradeep teregowda. 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.
Highfrequency llc resonant converter with gan devices and. Llc board is targeting large lcd backlight applications. This application note describes the led driving system using a halfbridge llc resonant converter for high power led lighting applications, such as outdoor or. Design on led driver based on llc resonant topology.
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. Multichannel constant current mc 3 llc resonant led driver. Llc evaluation board that includes an llc resonant converter and led driver circuitry. Ucc25710 98w llc resonant halfbridge 4string led driver. 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 100w led lighting driver reference design pmp4302a using this multitransformer llc control is developed.
A new offline led lighting driver solution with multi. Operation and design 4 application note an 201209 v1. Ieee journal of emerging and selected topics in power electronics 3 3, 589598, 2015. Llc board is targeting large lcd backlight applications where there is a. Dutyratiocontrolaided drca llc converter for current balancing of twochannel light emitting diode led driver is proposed and analyzed. 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. Find resonant converter related suppliers, manufacturers, products and specifications on globalspec a trusted source of resonant converter information. Redisem led llc converter deliver bestinclass efficiency. The l6699 is a doubleended controller specific to seriesresonant half bridge topology. Later it will be shown that most of the time an llc converter is designed to operate in the vicinity of f0. Llc series resonant converter based led lamp driver with. 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.
It provides up to 200w constant current or constant voltage output from a universal ac input. A resonant led driver follows the same basic design as a resonant power supply. Offering everything necessary to build a reliable and robust halfbridge resonant converter, the flsxs series simplifies designs and improves productivity, while improving performance. An introduction to llc resonant halfbridge converter. Highpower ledlighting drivers power systems design. Optimal trajectory control of llc resonant converters for.
Multichannel led driver with cll resonant converter. The flsxs series of general lighting power controllers includes highly integrated power switches for medium to highpower lumens applications. By employing the multiple transformer structure, one singlestage driver can drive multiple led channels, simplifying the driving scheme and circuit complexity. Commercial industrial led lighting drivers tolerance, allowing.
Output voltage ripple reduction with noise spectrum spread. This paper proposes an llc resonant converter based led light emitting diode lamp driver with high power factor. A high efficiency led driver circuit using llc resonant converter. Llc series resonant converter based led lamp driver with zvs. The considered led driver topology is based on a bridgeless single. Designing an llc resonant halfbridge power converter article. The led driver should have the capability of providing constant current. 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 this paper, an llc resonant converter for driving multiple led lights using the current balancing of a capacitor and transformer is proposed. 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. 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. This paper proposes a novel pwm dimming solution with optimal trajectory control for a multichannel constant current mc3 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. Llc resonant converter transformer design equations led. Llc provides a high efficiency power conversion pled pin. Pdf design of half bridge llc resonant converter for low. Synchronous rectifier reduces conduction loss in llc. This fixed frequency synchronous buck converter is taken from the simplis tutorial. 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. A new offlineled lighting driver solution with multi. In addition, this study also designed and optimized the primary and secondaryside.
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. Modelling of 200w led driver circuit design with llc converter. This paper proposes mathematical model of 200w led driver circuit design with llc resonant converter. 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. Llc led driver design simplified electronic products. A high efficiency led driver circuit using llc resonant. Led driver based on boost circuit and llc converter ieee xplore. Us8629627b2 multitransformer llc resonant converter. In a first aspect, an llc resonant converter is provided for driving a plurality of output circuits from a dc input signal. 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. Resonant converter operation minimizes losses resulting in lower component temperatures and smaller cases. Pdf this paper presents the twostage led driving system using llc resonant converter for led lighting application. Design and experimental evaluation of a singlestage acdc. The proposed circuit uses a full bridge rectifier to.
Ucc25710 98wllc resonant halfbridge 4stringled 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. Highvoltage resonant controller with pfc for led drivers. The led intensity is controlled by the ratio between the ontime and offtime of the pwm dimming signal. Analysis and design of resonant dcdc converters for. Design considerations and experimental results are presented for a 200w led driver prototype which. An9729 led application design guide using halfbridge llc.
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