1 watt led driver using a joule thief circuit transistor

From what i heard, a joule thief is terribly inefficient and seems to be some weird circuit. The approach below is popularly known as jeannas light heres jeannas youtube channel. Sir i want to drive 1 watt led of forward current 350 ma. It can also power an led with a cell that is deemed dead. A suitable driver transistor, like the 2sd965, 2sc2500, 2sc2655. This can be reduced is something better than a transistor was used such as a n op amp with suitable matching of led string voltage and supply difference to minimize wasted heat in mosfet 2.

Oct, 20 i recently assembled a pulsing led circuit using the schematic below. The transistor does affect how low the circuit runs to. The content explains a very simple yet effective 1 watt led driver circuit which can be operated with or inputs small 1 watt smps led driver in the first design which is the most recommended one, we study an smps led driver circuit which can be used for driving same electronics microscope. Ive made a joule thief, and it works fairly well, but not as well as i would like. Circuit1 provides the dimmest lighting, while the other circuit tends to light. A joule thief circuit is pretty popular with all electronic hobbyists, because the concept allows us to. I use this kind of circuit for driving white leds also but i use 2n2222 as the driver and it works just fine. But in my case, i am still tilted toward the simplicity of a joule thief circuit using little more than an ic and an inductor, as revealed in my instructable. Some notes about using the joule thief to charge nimh batteries. Simple 1 watt led driver circuit making easy circuits. I intend to hook up 2x1 w high power leds, my battery bank is 6v 4ah 20hr. The simple 1 watt led driver circuit buck converter presents approximately 90% efficiency. Friends in this video i will show you joule thief circuit.

Question 2 is the 1n4148 diode neccessary in the above schematic. A simple single coil joule thief with a timer function. A simple single coil joule thief using two 2n2222 transistor to convert 1. Joule thief 1 watt led driver the present article discusses 3 such circuits, however here we replace the traditional 5mm led with a 1 watt led. The resistor on the base of the transistor was 330ohms and it delivers 54 ma. A joule thief can be used to power an led bulb using just one 1. The content explains a very simple yet effective 1 watt led driver circuit which can be. Jan 10, 2018 home 1w, 4w, 6w, 10w, 12w led driver circuit smps last updated on january 10, 2018 by admin 40 comments right here we research a very easy 120v220v smps led driver circuit that can be used for driving high watt leds rated any place between 1 watt to 12 watts instantly from any domestic ac mains outlet.

The joule thief circuit is not very efficient, although it probably will allow you to run longer, because the batteries will still provide enough power for it, even after they fall below 1 vcell. Joule thief use of transistor, the less will be brought as they can handle more amps. The circuit can utilize an input voltage down to about 0. This circuit is also known by other names such as blocking oscillator, joule ringer, vampire torch. Such as we use 1 transistor and all other parts of 5 pcs only. Once you have understood the circuit you can calculate the current rating required for your led and build it on a breadboard to test it. The coil consists of a standard ferrite toroid core with two windings of 20 turns each using 0. Working of this 1 watt led driver circuit two transistors, bc557 and bc337 along with the 33pf capacitor and 47k ohm resistor forms a. Joule thief circuit works by rapidly switching a transistor connected to a toroid. When the led is driven directly from the power supply at ma dc the brightness is about the same as from the joule thief circuit with 1. If you use a 2n3904, bc547 or similar transistor, expect to get less than 50 milliwatts, maybe only 30 or 40. The black band means no zeroes after the 47, or 47 uh. The niftystuff led boost circuit joule thief is a device designed for two purposes.

The joulethief circuit is one of solution method for energy saving by using raised. Here a simple 1 watt led driver circuit based on a modified joule thief design, runs on a 1. Mar 21, 2015 this joule thief led or high efficiency led with 1. Dec 04, 2016 if you mean a circuit like this, then a bjt is the natural choice. An led driver is an electronic circuit that utilises a transistor to switch power to an led. I got the concept of this circuit few years back from a led torch, which was powered by a single aa battery. A common 5 mm highefficiency white led d1 is the key component in this design. Is the joule thief my only option if i must use these leds and batteries. Simple 10w high power led driver circuit electronic circuit. Also, on a joule thief there are two mechanisms that cause oscillation you have mentioned the saturation of the transistor but, at higher supply voltages it is the saturation of the transformer core that halts the induced voltage on the base coil and thus the oscillator begins the turnoff process. The joule thief circuit puts a heavy demand on the transistor for high current at very low voltage. If the led has a higher power requirement, then it is best to use an npn transistor as a. I intend to hook up 2x1 w high power leds, my battery bank is 6v 4ah20hr.

Membuat joule thief mini inverter to ac light super hemat skema circuit. Apr 29, 2016 here is the demo how joule thief works to light an 12 volt led this is by far the best of this circuit. Joule thief circuit diagram diy electronics projects. A joule thief is so named because it can use just one cell. This simple led driver circuit can be used to drive many types of high power leds of different watts. You showed the choke as 470 uh, but yellow, violet, black, silver is a 47 uh, 10 percent choke.

This joule thief led or high efficiency led with 1. The joule thief circuit using only easily found parts and no transformer might be attractive to many readers here. Can the bjt transistor in a joule thief be replaced with a. It is rated at 800 lumens and is the best led bulb i have tested to da. In this weeks weekend projects video podcast, make magazines bre pettis and i show you how to make a joule thief. The reason is that a standard mosfet will not turn on with just 1. Experiment with joule thief circuit do it easy with scienceprog.

Description the parts to the right of t1 form a simple joulethief blocking oscillator circuit which boosts the 1. Simple high power led 10w 12 volt driver circuit, by using one transistor and other. Its a little wisp of a circuit that allows you to drive a blue or white led from a low voltage. The circuit is a constant current source, which means that it keeps the led brightness constant no matter what power supply you use or surrounding environmental conditions you subject the led s to.

With the help of an ordinary low power npn transistor t1c547bphilips we can drive this 3. Is it possible to use ready made inductor, those that look like surface mount resistor. The basic principle behind the 230v led driver circuit is transformer less power supply. The initial 6 volts from a charged battery is dropped to the required 3. In effect, the 4 legged ic replaces the clunky toroid.

Simple high power led 10w 12 volt driver circuit, by using one transistor and other cheap components. Would it be a good idea to use joule thief circuit for 1 watt leds. The main component is the xrated ac capacitor, which can reduce the supply current to a suitable amount. Basically, it adds an led to the output of a selfoscillating voltage booster. Working of joule thief circuit explained in easy words. The pdf file that goes with the podcast is here 450 kb pdf file so whatsa joule thief. This circuit is pretty efficient and it can power a 1 watt white led quite brightly. The concept discussed here remains exactly identical to the usual joule thief configuration, we just replace the normally used 5mm led with a 1 watt led. The joule thief circuit accomplishes this by using a coil to store energy and then generating spikes of. In the first design which is the most recommended one, we study an smps led driver circuit which can be used for driving high watt leds rated anywhere between 1 watt led upto 12 watts. Usually, the signal from a microcontroller, or logic gate, does not possess sufficient drive current to power an led directly.

The niftystuff led boost circuit joule thief is a device designed for two purposes 1 to suck any and all traces of juice from your dead batteries. I keep that battery around to find the shutdown voltage of the various joule thieves that i made. I designed a 1 watt led driver circuit which uilized the luxeon staro led which. Now lets understand how the joule thief circuit able to drive a 3v led from an almost dead battery. A highpower joule thief type circuit to drive a 1watt led from a 1. Simple 10w high power led driver circuit publisher elcircuit. The second winding has been replaced by a pnp 2n3906 and c1.

I used 2n2222 transistor, 510 ohm resistor found out that is the best with a help of potentiometer and was able to brightly lit four that is all i had 1watt high power led in series which requires same amount of current as if it was used for only one led using two 1. Simple science projectfriends it is a very simple circuit and you can easily make the. Oscilloscope gwinstek gos6200 is used to display observed. Another advantage of it is that it saves a lot of battery power. A suitable driver transistor, like the 2sd965, 2sc2500, 2sc2655 must be used. Its part of a multiplexing circuit and i do not have the option to make it a low side switch. Simple 10w high power led driver circuit power led, led. Hobby circuits, home circuits, how components work, power supply, techniques, utility gadgets. I recently assembled a pulsing led circuit using the schematic below. The only active devices thats been employed in the proposed simplest 1 watt led driver circuit are a few diodes and a mechanical switch. Mar 10, 2016 joule thief using mosfet transistor to 4w led lamp 220v ac simple circuit. Im hoping increasing the voltage from the jt will improve it, but im not sure how to increase the duty cycle of the transistor.

I added four more led lights wired in parallel and tried to power the circuit using four aa nimh rechargeable batteries wired in series but the batteries dont provide enough voltage. The any value joule thief single aa high power white led driver. Actually, i own very few lights well, to a nonflashaholic i own an arsenal but in reality i only own a few lights most are customer lights that i photograph before sending them out to their respective owners. These capacitors are connected line to line and are designed for high voltage ac circuits. The voltage rises quickly, and when it gets to the led forward voltage, the current flows thru the led and the voltage stays roughly fixed. Hobby electronics cool electronics electronics projects led projects circuit projects arduino joule thief high power led electronic. Since i recently have been playing with my own joule thief circuit, i decided to build a couple of lights to take advantage of the abundance of used aa cells and lots of new d cells that come free with most d mags that i buy from frys, homedepot, etc. The circuit is a constant current source, which means that it keeps the led brightness constant no matter what power supply you use or surrounding environmental conditions you subject the leds to. A joule thief is a minimalist selfoscillating voltage booster that is small, lowcost, and easy to build, typically used for driving small loads. This is why i thought it was important to reveal this project.

More info on this can be obtained from the following post. It can be directly driven from any domestic 220v ac or 120v ac mains outlets. Question 1 instead of using a transformer or winding a toroid coil. Nov 19, 2011 could be my circuit, but with the battery voltage at 0. When we turn on the circuit, the current flows through the resistor and to left hand side of.

It seems that many joule thief circuits depend on a clunky bulky and heavy toroid or donut that has to be carefully wound with copper wire. This circuit has a transistor operated as a switch to cut voltage and current. Following the tips outlined below, you can use the joule thief circuit to power a compact fluorescent lightbulb cfl using just some aa batteries. Dec 04, 2011 joule thief battery charger schematic. If you mean a circuit like this, then a bjt is the natural choice.

It can use nearly all of the energy in a singlecell electric battery, even far. But now there are several very small 4 legged ics available that do the job using only a simple inductor, single cell battery and a led. Joule thief nike hercules 10 to 50 watt led driver. Not only does it work with a brand new battery, but it works. My circuit looks like as shown below after i built it on a breadboard. Joule thief circuit in the simulation file, we attached a 1. I am in the process of building a battery charger this week and will put data about this project as i charge batteries. I used 2n2222 transistor, 510 ohm resistor found out that is the best with a help of. Most joule thief circuit schematic specify the use of 1 or 2 coil. Im trying to build a high side switch using a pnp and npn transistor together to run 7 10w leds off of a led driver.

Heres a really simple and inexpensive power led driver circuit. Friends in this video i will show you how to run 18 led by a single 1. The video shows how 1 watt led can be brightly illuminated using a 1. Jan 10, 2018 the simple 1 watt led driver circuit buck converter presents approximately 90% efficiency. Lcsc electronic components more asian brands, lower prices. Driving an led using a transistor an led driver is an electronic circuit that utilises a transistor to switch power to an led. Joule thief using mosfet transistor to 4w led lamp 220v ac.

The concept it to try to determine a running current by using the inductor, diode and load, at the same time the switch fills up the missing load energy on a single cycle. Pdf joulethief circuit performance for electricity energy saving. For example, run a white led from a single aa battery. This circuit has been specially designed for a 6v rechargeable battery or 5 x 1. Is the joule thief my only option if i must use these led s and batteries. Could be my circuit, but with the battery voltage at 0. Depending on different led technologies, the forward voltage starts at about 1. In the photos below you can see ive put it in a soda can and im using it to read by.