Led 1w driver

An LED can also be powered directly form a suitable power source but in most cases the LED will pump in more current than it could handle and it eventually get destroyed. Hence we use a driver circuit which restricts the flow of current that passes through an LED.

In this article I will explain you how you can design the circuit based on your current limitations using the LM IC as a current limiter.

The circuit Diagram of the high power LED driver is shown in the image below. As you can see the driver has nothing more than a LM IC and a resistor.

The above circuit is designed to drive a LED with 0. This current rating is fixed by the Resistor R1 in the circuit. As you can see in the LED driver circuit diagram , for a resistor value of 5. You can use the same formulae and calculate the Resistor value for your desired current rating, I have calculated the values in the below table for few values of current as an example.

The wattage rating of the resistor is also very important to calculate for this circuit. Because the current passing through these resistors are high. As shown in the table aove if we design a circuit for 1A then we should only use a 2 Watts resistor else the resistor will be damaged.

Welcome to my another 1 watt led driver project. It's simple and easy to build. I just found a 1 watt led driver circuit diagram on internet and i build it because it's helpful for me. With the help of this diagram we can build our own 1 watt led driver circuit just follow the steps.

Cut the piece of veroboard according to the size of splitter box. Place the components on veroboard according to the circuit diagram and then soldering it very carefully. Reply 6 years ago.

Transform the ac Main in the First Step down to a non risk voltage under 50 Volt then do all the other components. A 1 watt LED connected with the above circuit would be able to produce around 60 Lumens of light intensity, equivalent to a 5 watt incandescent lamp.

As can be seen in the fourth diagram, the concept hardly utilizes any circuit or rather does not incorporate any hi-end active component for the required implementation of driving a 1 watt LED. The only active devices that's been employed in the proposed simplest 1 watt LED driver circuit are a few diodes and a mechanical switch. The initial 6 volts from a charged battery is dropped to the required 3. Since each diode drops 0. As the illumination of the LED drops, each diode is bypassed subsequently using the switch, to restore the brightness of the LED.

The use of the diodes for dropping the voltage level across the LEDs makes sure that the procedure does not dissipate any heat and therefore becomes very efficient in comparison to a resistor, which would have otherwise dissipated a lot of heat in the process. In the 5th design let's learn how to illuminate a 1 watt LED using a 1. The circuit is obviously based on boost driver technology, other wise driving such a huge load w such minimal source is beyond imagination.

A 1 watt LED is relatively huge when compared to a 1. A 1 watt LED needs minimum 3 volts supply which is double the above cell rating. Secondly a 1 watt LED would require anywhere between 20 to mA of current for operating, mA being a respectable current for driving these light machines. Therefore using a AAA penlight cell for the above operation looks very remote and out of question.

However the discussed circuit here proves all of us wrong and successfully drives a 1 watt LED without much complications.

Circuit Operation. The diagram shows a rather simple configuration, which is basically a boost converter set up. The frequency is switched by the transistor and the schottky diode via the inductor. The rapid switching of the inductor provides the required boost in the voltage which becomes just appropriate for driving the connected 1 watt LED.

Here, during the completion of each frequency, the equivalent stored energy inside the inductor is pumped back into the LED generating the required voltage boost, which keeps the LED illuminated for long hours even with a source that's as small as a 1. This is school exhibition project which can be used by children to show how solar energy can be used for illuminating a 1 watt LED.

Hi Swagatam, I have come across your site and find your work very inspiring. The program also introduces empathy in the engineering design process where young learners are introduced to a real project context and engages with their fellow school peers to solve a worldly problem. For the next three years, our focus is on introducing children to the science behind electricity and the real-world application of electrical engineering.

An introduction to how engineers solve real-world problems for the greater good of society. I am currently working on online content for the program, which will focus on young learners Grade learning the basics of electricity, in particular, renewable energy, i.

Through a self-directed learning program, children learn and explore about electricity and energy, as they are introduced to a real-world project, i. On completion of a five-week program, children are grouped in teams to construct solar lights, which are then sent to the disadvantaged children around the world. As a not 4 profit educational foundation we are seeking your assistance to layout a simple circuit diagram, which could be used for the construction of a 1 watt solar light as practical activity in class.

We have also procured solar light kits from a manufacturer, which the children will assemble, however, we need someone to simplify the circuit diagram of these light kits, which will be used for simple lessons on electricity, circuits, and calculation of power, volts, current and conversion of solar energy to electrical energy.

I look forward to hearing from you and keep on with your inspiring work. Whenever a simple yet safe solar controller is required we inevitably go for the ubiquitous IC LM Here too, we use the same inexpensive device for implementing the proposed 1 watt LED lamp using a solar panel.

A quick inspection reveals that if a current control is present, voltage regulation can be ignored. Here's a simplified version for the above concept, using only a current limiter circuit. If you have any circuit related query, you may interact through comments, I'll be most happy to help!

Your email:. CFL bubs are very complicated to build because they involve inductors which are too critical…so i am sorry, no ideas. Hello Swagatam! Thank you for all of your time answering everyone's questions. I would like to use your circuit design in a middle school project to create LED light fixtures housed in home cut and planed cherry wood housings. I am wondering which of your two posted designs you would recommend for this project, and how many 1 watt LED's you think would be appropriate for a 3 foot long bar type fixture to give an impression of consistent lighting when used as uplighting mounted above eye level on a wall I am imaging a simple V design for the housing.

Remember that you will need a heatsink back PCB for mounting the LEds and an additional thick aluminum heatsink attached behind the PCB for optimum cooling. Along with this you will have to incorporate a current limiter circuit with each LED module, and the the whole thing will need to be powered through a 2amp 12V smps.

You can use the circuit which is given in the above article, by connecting all the LEds in series to the output. Your current calculation needs correction….. Increasing current won't be a good idea and is not recommended for such power supplies, instead you can use ordinary 5mm LEDs and connect 50 of them in series, it will produce much higher illumination than a three 1 watt LEDs. Very nice and perfect circuit.

I made and used under your kind advices. Thanks again. I also made circuit of six 1N perfectly. That is also nice. Please also advise me a perfect and durable five one watt LED circuit. It is not too big. You just have to adjust the pot accordingly for getting the required brightens. I mean how does this value of capacitor restrict or limit the current that is being used by power-led? Also how are we restricting the voltage supplied to the led to 3. I know that even if we provide 5V to the led the forward drop will always be 3.

Then how do we limit the voltage supplied to the led? The current is important here which we want to limit by putting a resistance in series with the mains, the capacitor acts like a resistance here which is calculated by calculating its reactance, you can Google a little to find the formula for reactance, this will be in Ohms, next you can employ Ohms law to calculate the current that can be limited through this reactance or resistance.

You will need to put appropriately calculated resistors with each ED, only then all will light up with uniform brightness. Hi output voltage of about 3 volts. Is it possible to add. Hi sir I'm planing to connect 40 1 watt led's in series so i want to add an fan speed controller for dimming.

I'm interested in electronic but i don have much knowledge in electronic plese help me can u send me the pic of ready circuit for reference wajedpasha58 gmail I'm waiting for Ur reply. You will have to measure the volts across the leads of the LED, and measure current in series with the LED, then multiply the results to get the wattage. I have seen your posting of 1watt led drive from mains supply its good i have tried but, my led has blown out and i have checked the out put is showing v Dc..

I have used the the below parts.. I have connected as per the draw shown above kinldy le me know where im doing the mistake..