High-power led constant-current driver circuit design and efficiency analysis

This article gives a short overview on the design and power considerations necessary to. Led driver electronic circuits design electronics projects. Summed up the development process in the led, led parametric test and drive circuit design is necessary. The ic has been specifically designed for operating high power leds safely by providing a constant current output. First time i seen efficient driver circuit, please share the material source from mumbai like name s or websites of shops. See how to design a simple, low power constant current driver for leds. Building simple constant current power led driver do it. In addition to driving an nchannel power mosfet switch controlled by the switching controller, it also drives an nchannel pwm dimming switch to achieve led pwm dimming. Led driving ic, the chip commonly adopts a low comparison voltage about 200 mv, so the power consumption of the sampling resistor is not great. As the most common method to switch an led on and off, a transistor provides a regulated supply of current. They can be a hassle to power, though constant current led drivers are expensive, and arent necessarily as flexible as you might want them to be. This circuit too is based on the mp3302 led driver ic. Led driver circuits, to date we have not published a design to drive a bunch of highbrightness white leds. And9041 designing highefficiency led driver circuits using.

The reason is that leds are much more efficient than standard incandescent or cfl light bulbs. But the current driver for this kind of led does not have a good efficiency. Wang li5proposed a singlestage flyback constant current led driving power supply that uses a continous conduction mode ccm, which mainly uses the control technology of the multiplier, the. Constant current drivers are designed for leds that require a fixed output current. The voltage drop across an led is approximately constant over a wide range of operating. Electrical design driving single led light sources in nondimming applications is relatively simple. Its very useful article as the market cost of efficient driver is rs. An extra bias circuit comprising of resistor r and zener diode d is added inorder to make the on resistance of the power mosfet low and make the chip compatible to. By using current mirror and pwm technique, the circuit has good efficiency.

These drivers vary the voltage along an electronic circuit which allows current. Based on the actual test results, design a typical application of the led drive circuit. The design of the highpower led constant current drive. In addition to pwm dimming, the max16834 provides analog dimming using a dc input at refi. Figure 3, a high power led driving circuit design using national semiconductor lm3402 0. However, the design concept for both circuits is complicated. Normally for high power led module will produce heat after several times.

Most of leds have a specified current level that will achieve the maximum brightness for high efficient level. Led is an energysaving product, and the efficiency of driving power is high. Design and implementation of 150 w acdc led driver with. The design of high power led headlamp wenlinchen 1, a,zhen an 2,b,chaoqun xiang 2,c,chenyang liu 2,d,linahao 2,e 1 college of resources and civil engineering, sh enyang, liaoning province of. The mcpcb has four large solder pads for easy solder connections. The figure shown below fig 3 is of an led driver circuit that can be operated from a wide supply voltage range 3. If you want a probably crazy idea, you could put the leds in several series strings, with a constant current buck switcher driving each string, and use shunt fets to do the pwm control. And9041 designing highefficiency led driver circuits. Design of a high power led driver requirements and. Red is the power dissipated by the jfet, datasheet here. The lm3410 ic is a constant current led driver useful in either boost converter or sepic design applications. Mar 01, 2014 48v input to 35v output, 10a led driver optimized for efficiency. Driving a 1 watt and a 3 watts led all these 3 last circuits with the single transistor driver including the one with the voltage divider are capable to drive high power leds.

These values are instrumental in ensuring the proper compatibility for the relevant application such as dimmable lights, integrate circuits and high power led drivers. The circuit must provide sufficient current to light the led at the required brightness, but must limit the current to prevent damaging the led. The majority of high power white leds are designed to be run at 350ma constant current. Constant current light emitting diode led driver circuit and method. The universal high watt led current limiter circuit described here may be incorporated with any crude dc supply source to get an excellent over current protection for the attached high watt leds. We offer the color xpe2 in two metal core printed circuit board mcpcb versions. The current driver circuit of the present disclosure includes a temperature compensation feature which controls the on time for the leds based on a measured temperature of the current.

An led driver is an electrical device which regulates the power to an led or a string or strings of leds. They also last longer than either of the alternatives and dont have issues with disposal like cfl bulbs. The max16818 is suitable for use in synchronous and nonsynchronous stepdown buck topologies, as well as in boost, buckboost, sepic, and cuk led drivers. Fundamentals to automotive led driver circuits texas instruments. This input power could be obtained with about 5 to 8 of the top available leds and it will often be better to use the best available if top efficiency is wanted. Paper open access design of a singlestage flyback led. A dimming driver designed to drive an external nchannel mosfet in series with the led string provides widerange dimming control up to 20khz. High efficiency power supply for led lighting applications wo2007064694a3 en 20051. Leds are best driven with a constant current source, but unlike most system loads, they do not have to be ground referenced. Development of high power led driver using ltspice software.

Commercially feasible low cost led driver circuit 15 watt. Designing high efficiency led driver circuits using the ncl30051 introduction lighting represents about 16th of global electricity consumption. This document presents a simple, lowcost led driver topology useful for ac led lighting solutions at any mains voltage or frequency. Constant current led drivers cost efficient, reliable, and easy to use. Here the resistors r1, r2, and r3 help to determine the correct pwm setting for achieving the intended constant current output from the ic. Referring to the standard transformerless constant current led driver circuit using the ic mbi6001, we can see hardly any external components being used except a few resistors. May 08, 2019 the article explains a simple 1 amp constant current led driver circuit using the ic mbi6651 from macroblock. Highpower led driver accepts wide inputvoltage range an3532 circuit based on a buckboost converter controller regulates current to a white led, despite an allowed variation of input voltage from 2. While the ratings of a 3 watt led are forward voltage.

Pdf research on a highefficiency led driving circuit based on. High efficiency power supply for led lighting applications us20080224625a1 en 20061215. When selecting the right led driver, verify the specs to determine whether it operates on either constant current or constant voltage to prevent frying your leds. It has three constant current led drivers and a buck boost smps for driving rgb leds with high efficiency. American lighting led dr12700 led constant current hardwire driver 700ma, class 2, 312 watts, nondimming. Finally heres the simplest high power led driver circuit diagram. A significant disadvantage of switching drivers is that they tend to. May 01, 2014 usually, when we need to drive low power leds, we dont care much about power losses. The led is much more efficient than the previously mentioned alternatives. Experiments show that using led lights instead of the traditional incandescent lamp is a general trend,with good reliability. Us8203281b2 wide voltage, high efficiency led driver. Led light sources are not designed to be driven with a reverse voltage. An analog current control input is provided so the lm3434 can be adjusted to compensate for led manufacturing variations and or color temperature correction.

The circuit is designed for use within a wideinput. Dec 19, 2016 while the ratings of a 3 watt led are forward voltage. Discrete constantcurrent led drivers implementing a constantcurrent circuit will provide a more power efficient and stable design. The dctodc converter being used in this circuit is a boost. This brings about the need for highpower led driver that can deliver and regulate led current in a powerefficient manner. Leds that are rated to operate on a constant current driver require a designated supply of current usually specified in milliamps ma or amps a. Low and highside constant current led driver topologies. What we do we add a current limiting resistor, and thats enough.

The currents are much more prominent here like 1a and more. There is a lot of effort going on to improve the technology of led light emitting diode lighting. Description the max16834 is a currentmode highbrightness led hb led driver for boost, boostbuck, sepic, and highside buck topologies. The ltc3600 led driver circuit is manufactured by linear technology, and can be used for design a very simple high efficiency led driver circuit with programmable dimming control. As you can see in the schematic circuit this high power led driver circuit require few external components and can provide a maximum output current of 10 amperes. The lm3549 is a high power led driver with up to 700ma output current. This costeffective driver design combines good power factor, simplicity, high efficiency, and impressive driver. Led drivers integrate mosfets circuit protection digikey. Figure 1 shows a design that delivers 350w output power to drive up to seven leds in series from a 48v source.

This switching allows it to operate at upwards of 80%90% efficiency. Although high power led is not large to replace the traditional lighting lamps and lanterns, but they are in indoor and outdoor decoration, special lighting is more and more widely used, so master the design of the highpower led constant current drive technology, is very important to open up a new application of high power leds. In order to design an efficient led constant current driver, a certain process is given as follows about how to select components. Led drivers are designed for sequential drive so only one driver can be enabled at a time. The circuit of figure 1 starts and operates a 1a led from a voltage that ranges from 2. This guarantees that no matter the fluctuation in voltage, the current driven to the led will be maintained at the specified level. Tps92511 constant current buck led driver ti mouser. Its a rather intricate approach, but it would be cheaper than 30 switch mode drivers, and would be more efficient than 30 linear drivers.

Bsod 1218x1w constant current 300ma high power led driver ac 85. The output of led driver power is mostly a constant current source that can. Therefore, the lt3477 with its floating current sense amplifiers can be converted into a buck led driver with low led ripple current. On the other hand, constant current led drivers are manufactured to only operate constant current devices with specific ratings, making them the more efficient of the two drivers. Pdf a high efficiency led light emitting diode driver based on buck.

This costeffective driver design combines good power factor, simplicity, high efficiency, and impressive driver scalability in a very adaptive and versatile platform solution. Research on a highefficiency led driving circuit based on buck. Led circuit drivers energy efficient circuits for led. A high efficiency led light emitting diode driver based on buck converter, which could operate under a wide ac input voltage range 85 v 265 v and drive a series of high power leds, is. In advanced economies, this ratio may be significantly higher due to high commercial usage. L99ld01 is a precise constant current dcdc converter led driver for automotive applications, dedicated to the control of highbrightness led headlights an housed in a lqfp32 package. As shown in figure 5, you can choose either a bjt or metaloxide semiconductor fieldeffect. Led by power and luminous brightness can be divided. For example, in the us it is estimated that only 28% of the energy consumed for lighting is for residential. As a simple project, ive built the driver circuit and connected it to a highpower led and a powerbrick, making a plugin light. The led driver circuit uses the switching power supply as the first level of control, the pressure control constant current source as the second level of control, combined with the advantages of the two, the efficiency and control precision are guaranteed, and can be directly supplied by the city electricity, two. A sepic single ended primary inductance converter design allows the power supplys output voltage to be set above, below or equal to its input voltage. Vz1, vz2, vq1, vq2, r1, r2 form a linear constant current source, it ensures that only the current flow through each white led same, uniform brightness. Constant current led drivers are designed for a designated range of output voltages and a fixed output current ma.

Constantcurrent source an overview sciencedirect topics. High power led driver circuits power led, led, circuit. The circuit includes very few external components and therefore becomes very easy to assemble at home. Research on a highefficiency led driving circuit based on. To simplify the analysis, the sampling switch and voltage buffer are assumed to be ideal. Highpower factor flyback converter for an led driver with. Good for one led, very simple, you can throw anything from about 4v to 20v at it, and it happily gives the led a fairly constant current. Download citation highpower led constantcurrent driver circuit design and efficiency analysis highpower led lighting driver technology is one of the key issues of its application and. Figure 1 shows the basic circuits for driving leds using one constantcurrent driver. A programmable led constant current driver circuit for driving leds at constant current and dimming the leds using standard, offtheshelf dimmers is provided.

Current flows from the pside to the nside of the diode. A high efficiency led light emitting diode driver based on buck converter, which could operate under a wide ac input voltage range85v265v and drive a series of high power leds, is presented in this paper. Highpower white led driver circuit characteristics and design. Design of low power lighting led driver with multiplex. Building a constant current driver for highpower leds. The device is designed to be used in boost, buckboost and fly back converter topologies. Cheaper than commercially available products with the same functionality as this product. I am using a cree xml led datasheet here, its the 240lm neutral white model, part number. The led driver using electric direct rectifying filter, get control of led dc voltage, without the need to led fluorescent manufacturer stepup or stepdown treatment, so the power drive circuit is simple, and the power supply with high. Through analysis of the highpower led light sources electrical characteristics and performance requirements to driver circuit, combining with several common constantcurrent driver circuits, this paper studies these types of constantcurrent driver circuits structure, performance and. You are going to connect two white luxeon leds with 3,42 forward voltage each mostly mentioned as vf in common datasheets. The actual measurement results were compared, demonstrating the.

High power led lighting driver technology is one of the key issues of its application and development. Most dcdc constant current led drivers are buck or stepdown converters. Led current is set by r3, it is approximately equal to. Efficiency of a charge pump charge pumps are very efficient if v in x gain is close to target v o efficiency drops off as v in increases. In this paper a new kind of led driver circuit was designed. While we have now published quite a few led driver circuits, to date we have not published a design to drive a bunch of highbrightness white leds. The internal feedback circuit keeps the current regulated to within about 5% but excess power has to be dumped as heat, so good heat sinking of the regulator is required. Such a circuit is now quite desirable as the price of white leds has fallen and you can have a handful for not a lot of dollars. This is because the chemistry of a white light led sets the forward voltage at about 3v and 3. A linear constant current led driver circuit design. Led driver circuit with pwm output in 2009, a group of chinese inventors submitted a patent for commercial power led constant current driver 2. The article reveals a simple regular constant current led driver circuit that are available for easily working any specific preferred high watt led. Figure 3 lm3402, an example of buck regulator figure 4, another led circuit design using texas instrument bq24105.

How to make 1 a constant current led driver circuit. Transformerless constant current led driver circuit. In this case, a single npn transistor is used to create a current sink for an led. A constant current driver is chosen to deliver the desired current, with enough forward voltage output to accommodate the maximum input voltage of the led source.

High power led driver circuits power led, led drivers, led. Max16834 highpower led driver with integrated highside led. This prototype suggested powering the led panel with constant current driver. At this high power level, dissipated power is a major concern, so high efficiency is critical. Led driver circuits, to date we have not published a design to drive a bunch of high brightness white leds. Erp power allows you to choose led driver circuits by a range of desired attributes. Therefore, when designing led driver circuits for an automotive lighting application, it is essential to contemplate led focal points, evaluate circuit design alternatives, and factors in system demands an led is actually a ptype ntype pn junction diode which allows the current to move through it only in a single direction. The programmable switching frequency 100khz to 1mhz allows design optimization for efficiency and board space. Although high power leds need complex driver schemes, the vast. Us8310171b2 line voltage dimmable constant current led. Download citation high power led constant current driver circuit design and efficiency analysis high power led lighting driver technology is one of the key issues of its application and. No amount of efficient driving of a very low efficiency led will make up for its low efficiency. Through analysis of the high power led light sources electrical characteristics and performance requirements to driver circuit, combining with several common constant current driver circuits, this paper studies these types of constant current driver circuit s structure, performance and. Digisys, can you post some of your designs that are not encumbered by issues.

An led driver responds to the changing needs of the led, or led circuit, by providing a constant quantity of power to the led as its electrical properties change with temperature. The constant current source has a drop voltage of 3 v, so the supply voltage should always be 3 v higher than the led voltage and can be up to 37v which is the maximum input voltage of the lm317. There are several low cost led drivers available on the markets that use this method or a standard linear voltage regulator can be used in constant current mode. Only 5 external components are required for basic operation. Based on the journals written by lee, do, peng, liu 2016 used different topology to get the high power factor circuit. Cheapest high power led driver circuit diagram circuits diy. Design and verification of a high performance led driver with an.

A switchmode constant current led driver operates similarly to a linear driver, except it uses a switching topography. Detects amount of power required by the lights automatically within its published operational limits. Figure 1 general straight circuit ccrbased led driver schematic. In order to design an efficient led constantcurrent driver, a certain process is. In electronics, an led circuit or led driver is an electrical circuit used to power a lightemitting diode led. Driving led lamps some simple design guidelines leds magazine. Max16834 highpower led driver with integrated highside. The circuit is a constant current source, the value of r3 sets the current. Finally heres the simplest high power led driver circuit. Constant current led drivers cost efficient reliable. Highpower led lighting driver technology is one of the key issues of its application and development.

Texas instruments tps92511 constant current buck led driver is an easy to use 65v constant current buck converter for driving a single led string. The max16818 pulsewidth modulation pwm led driver controller provides highoutputcurrent capability in a compact package with a minimum number of external components. Low power lighting led has the advantages of low cost and good heat dissipation. Designing a cc led driver some theory on dcdc converters, inductor equations, deriving component values and finally prototyping the circuit on breadboard. Youll need to use a more powerful transistor though, probably some kind of a darlington pair to provide all the current needed.

Although high power led is not large to replace the traditional lighting lamps and lanterns, but they are in indoor and outdoor decoration, special lighting is more and more widely used, so master the design of the high power led constant current drive technology, is very important to open up a new application of high power leds. A dedicated pwm input delivers a wide range of pulsed dimming and a high switching frequency up to 1. L99ld01 high efficiency constant current led driver. A high power buckboost switchmode led driver delivering a constant 350 ma with a. Another product of note is on semiconductors ncl30160 constantcurrent driver with an integrated 1 a, 50 m. Advanced led driver circuit design microtype engineering. Designing efficiency enhanced lowdropout linear high. Ltc3600 is a monolithic synchronous buck regulator whose output is programmed with just one external resistor. Therefore, the analysis of the driving power of zhongke hui bao. Led driver basics and its circuit design kynix semiconductor.

The 1up is a single xpe2 led reflow soldered to a 20mm hexagonal led star mcpcb. Highpower led constantcurrent driver circuit design and. A constant current led driver varies the voltage across the electronic circuit in order to maintain a constant electrical current. Im currently looking to design a driver for a single highpower led that can be brightness controlled and turned onoff via a pc.