Very easy hv power supply, you only need a television flyback and the circuit from a cfl lamp. Here are some tips and tricks you should know before doing this yourself. The way i usually connect the circuit to the transformer is by basically winding my own primary. This led driver is designed for converting an ac input to a regulated led current. Since the leakage inductance of the transformer provides the current limiting, and there is never dc component on the primary, arcs can be safely drawn from the transformer without. How to get 100kv out of your flyback very simple setup. Many sites doesnt provide circuits driving these transformers, they simply say that they are bad. This driver rectifies mains and produces a 320v dc source.
Flyback transformers are a great way to make a nice big electrical arc, but powering. In modern applications, it is used extensively in switchedmode power supplies for both low 3 v and high voltage over 10 kv supplies. Singlestage flyback and pfc controller product highlight quasiresonant control for highly efficient led driving solutions primary side flyback control with integrated pfc and phasecut dimming integrated hv startup cell for short time to light best in class system bom for dimmable led bulb features. If playback doesnt begin shortly, try restarting your device. Jul 27, 2019 high voltage from a cfl and flyback transformer youtube. Dug through a box of old cfls to see if one could really drive a flyback.
Designing flyback converters using peakcurrentmode. The flyback converter is a buckboost converter with the inductor split to form a transformer, so that the voltage ratios are multiplied with an additional advantage of isolation. Discover over 44 of our best selection of flyback driver on with topselling flyback driver brands. They work at a frequency of about 20khz, whereas the mains has only 50hz. It is then transferred to the secondary winding to provide energy to the load.
The led driver features a singlestage acdc converter with. The completed flyback driver with a conservative current limit and driven with 36v on the bus was tested up to a measured 120w input power for extended many minutes of continuous run time and remained all cool to the touch. Updates 16th mar 04 due to my latest simple flyback of a w 12v power simple flyback unit, i am able to carry out the more powerful single simple flyback driver experiments. Shop the top 25 most popular flyback driver at the best prices. This tube flyback driver is based on a vacuum tube tesla coil vttc and high voltage generation circuits in tube tvs.
Flyback transformer driver circuit flyback driver from. So, if you brush against the wire while youre operating an oscilloscope, or changing the channel on your tv who would watch tv with a flyback driver on. More importantly, the high voltagehigh frequency output from the flyback will instantaneously destroy any electronic equipment it comes into contact with. It is the same topology with almost the same efficiency, and its actually a nice example what happens when a primitive circuit like this is used with slightly bigger input. Finally, i have put two inline diodes to stop any ac currents flowing back up from the driver circuit. Cfls have a major advantage over other types of lightbulbs in that they plug into normal light sockets. Hydroponic full spectrum high power cfl compact fluorescent fluorescent 125w day grow light 5500k 125w baby skin care products. Ill show two videos in which i run a flyback from a 10w light bulb.
I havent read yet but as a guy who has built a few hundred watt sstc and a flyback driver as well as phase shifted pfc fullbridge 40v400v. The higher frequency has many advantages, such as smaller, lighter cores, smaller caps for rectifiers etc. The simple 555 flyback generated arcs are a lot less hazardous and a shock is not lethal at low driving voltages, unlike the zvs driver. After you have selected a container to put your transformer in and have. There are for example resonances by winding capacities, by coincidence of a tuned circuit with a switching frequency, influence of the lamp capacity, of the leakage flux and saturation properties of the ferrite core etc. You may also use the zvs flyback driver with a ferrite core and a custom made hv secondary, see this article. A compact florescent lamp is one of those swirly lightbulbs. It advisable, however, to avoid hot reconnecting of led loads wherever possible. This is a fairly configurable and very durable flyback transformer driver.
Mazilli zvs flyback driver kaizer power electronics. Safety is extremely important a flyback is not a toy. I hope that my pictures help to educate a better way to use this flyback transformer and zvs driver for demonstrations and experiments using high voltage. Flyback led driver download in an led application, the powersupply output current is regulated instead of the voltage unlike most power supplies. I spent a lot of time for finding resonant frequency around 15khz and dutyread more. A flyback transformer is one in which primary current is allowed to flow until the core is almost saturated, and then suddenly cut off. Dec 29, 2016 dug through a box of old cfls to see if one could really drive a flyback.
It is operating at bcm mode which results in good emi and efficiency. This is an efficient flyback driver for modern cylindrical rectified television flybacks. Select the right flyback controller for offline acdc, isolated dcdc and nonisolated dcdc power conversion and power management. The main advantages of this driver are simplicity of the circuit itself, very high efficiency and easily obtainable parts.
Another point to note is in drawing electrical arcs from the output. Their dna has given them traits to detect and grow towards lights. Flyback transformers are found in tvs and crt monitors. The step 9 page going further now includes a way to measure these illustrious voltage spikes with a regular volt meter. A better and a foolproof technique would be to salvage a few of the useful parts from the cfl pcb and then apply them to build a simple tranformerless led driver.
The design and construction a solid state tesla coil a tesla coil powered by transistors instead of a spark gap is not a trivial task. One simple way to reduce the load on the mosfet is to add a diode and resistor in parallel between the gate driver and the mosfet gate to speed turnoff. The primary side switching regulator controllers are configurable in flyback controllers, single or dualtransistor forward converters, pushpull converters, o. Design guide for qr flyback converter mouser electronics. An easy way to power flyback transformers hackaday. Singlestage flyback and pfc controller for led lighting. Flyback presents the user with a typical filemanager style view of their file system, but with additional controls allowing the user to. In contrast to obits and mots, flybacks cannot be connected to the mains directly. The mazilli driver uses mosfets and diodes to turn the mosfets on or off depending on the tanks voltage. The main purpose of this reference design is to demonstrate a high performance offline flyback led driver with pfc based on tps92310. Simple flyback driver for windows my circuit used a watt transformer from an audio amplifier. The first video demonstrates the high voltage arcing through a beercapful of beer stella artois with a power supply voltage of 9v. Introduction the mazilli zvs flyback driver is wellknown throughout the high voltage community for its simplicity and ability to deliver 2050 kv at high currents for a flyback transformer.
It is possible to generate even higher voltages from a flyback with a even more powerful driver but this may cause secondary coil insulation failure, rendering the flyback dead. First off, for those that may not know, a flyback transformer is the type of. Zvs flyback driver g1 from nematix labs on tindie zvs zero cross voltage switching flyback transformer driver, capable of generating high voltage and frequency drive by 2 power mosfet. I wanted something powerful and very reliable i hate replacing mosfets and this is what i came up with. The external supply should be rated 0 to 30vdc at up to 5a. Because my circuit building skills are not very good compared to the rest of you here although i can build basic circuits now i used to drive flybacks with anything, but ive experimented alot with cfl ballast drivers. Or you can use a secondary with only a few turns of tick cooper wire, to get a current so high, that can melt thin copper wires connected across the output.
During each cycle, when the input voltage is applied to the primary winding, energy is stored in the gap of the core. The flyback converter is used in both acdc and dcdc conversion with galvanic isolation between the input and any outputs. Significant improved driver efficiency, up to 90%, compared to other conventional solutions. They are usually anywhere from 14 to 60 watts, but once more, the bigger the better. Half bridge flyback driver with over current protection. Mar 14, 2015 i have also included inductors used as chokes to suppress any voltage spikes from the driver circuit. Flyback transformers are used to provide voltage transformation and circuit isolation. When driving for example a plasma lamp or a voltage multiplier the rectifying diode of the boost converter is left out and the device is called a flyback transformer. Flyback transformer driver circuit diagrams, schematics. Sainsmart zero voltage switching tesla coil flyback driver. Basically we use a 555 timer as an oscillator to generate a square wave between 10100khz.
Circuit quite simple but quite high voltage flyback transformer of placing the television or monitor eht transformer typically used in this poje song writer seems to. Pdf a flyback smps led driver for lighting application. A wide variety of flyback driver options are available to you, there are 352 suppliers who sells flyback driver on, mainly located in asia. Get a big one, the bigger it is the more powerful your driver will be. Flyback converter design using max17595max17596 is outlined. Nov 08, 2006 oversized cfl s 65w and up work great too, either a selfballasted screwin type, or the type that needs a special fixture with the ballast built into it. Basic introduction of flybacks and the driver circuit flybacks. Current draw will vary with type of flyback transformer. It was initially designed to generate high voltage sawtooth signals at a relatively high frequency. High voltage from a cfl and flyback transformer youtube. Hydroponic full spectrum high power cfl compact fluorescent. They are used for generating high voltage for the crt, which is needed to create an electric field, which in turn accelerates electrons towards the screen. Make a high voltage power supply using a cfl lamp and a flyback. These are 6 different kinds of flyback skip to content.
One of the advantages of cfl s is that they screw into any normal light socket. Dec 09, 2008 this is a tv flyback transformer driving a modified cfl. Flyback was originally based on rsync when the project began in 2007, but in october 2009 it was rewritten from scratch using git. A very easy setup to get high voltage from a flyback transformer, with using the circuit of a cfl. I build this circuit almost a year ago on a vero board, but it kept blowing the thin traces due to high currents flowing. How to find the primary and the secundary coils of a flyback. Back in 2008 before starting with high voltage, i have made numerous experiments with flyback transformers and with simple singletransistor drivers, most of these were undocumented.
In this video i made flyback transformer driver using old cfl circuit, and experiment with this flyback arc. This single transistor flyback driver topology was created in response to achieve higher efficiency and higher output voltages from ordinary crt television flybacks diode split flybacks, for experiments such as xrays or ionic lifters, without having to. Pmp7672 18w primary side regulated flyback led driver for t8. Jul 20, 2008 so for my first real flyback driver, i built a dual 2n3055 transistor based flyback driver. The zvs flyback driver either using bjts or mosfets have been used in high voltage devices such as tesla coils, marx generators, ion experiments, and ccfls. Flyback transformers if your selected chipset is not listed here, try our flyback transformer selector to pick the best flyback transformer for your application. The pulse train coming from the flyback transformer windings is converted to direct current by a simple half wave rectifier. Tps92310 220vac, w isolated flyback led driver with pfc. Offline flyback driver the walls the limit running power through multiple transformers just to power another transformer seems a bit absurd, so i though it was time for a direct mains powered flyback driver. Its based on some work by the people at rmcybernetics on ignition coil drivers, and it seems to work fairly well. Analog devices growing portfolio of primary and secondary side controllers provides a simple and costeffective replacement of dctodc converter bricks used in backplane power conversion. I used a long terminal strip to arrange the resistor components.
T1 is a tv flyback transformer, remove old windings from core and wind on 15 new turns for the primary. The 12sq7 is a highgain amplifier that boosts the feedback signals to oscillate the 6bg6 tube. Feb 14, 2014 an easy way to power flyback transformers. This paper proposes an isolated flyback switch mode power supply smps lightemitting diode led driver for lighting application. Flyback driver using cfl circuit experiments with flyback. This page will focus primarily on the design and construction of a halfbridge flyback driver. This is a instructable that contains scematic and pictures of a single transistor flyback driver. Aug 21, 2009 theory on leds why they need cfls to perform.
The problem is that the mosfet gets very hot in a few seconds. Design guide for qr flyback 4 design note dn 201 v1. The zvs flyback driver, made popular by vladimiro mazzilli, is one of the most efficient and powerful flyback drivers used by high voltage hobbyists from all over the world. Flyback transformer drivers the 555 driver basic flyback transformers are found in monitors, tvs or anything with a crt, and are sometimes known as line output transformers, or just lopt. Testing and results 1st september testing using a non rectified flyback driven by a 50w halogen light transformer. Since all you lazy fucks didnt want to build a zvs driver, heres a way to make high voltage easier.
A flyback transformer fbt, also called a line output transformer lopt, is a special type of electrical transformer. Converting a dead cfl into an led tubelight homemade. Pulling a ballast out of a spiral cfl might be a cheap and readily. This circuit, also incorrectly known as the 2n3055 flyback driver, bears some resemblance to the battery invertercontinuity tester which is published here. My box shows the primary side voltage of the zvs driver being applied with voltage, current, power and energy consumed by the zvs driver. So if this is your first hv project, stick to the lower power projects first. This appears to be a brilliant idea id never seen it suggested. A 12 v fluorescent lamp driver is one of the most critical circuits which you can make. A half bridge flyback driver is a neat project for any beginner hv enthusiast, which reflects much of the way a commercial high voltage power supply might be made. Videos here are three videos of the pic12f683 high voltage flyback transformer driver in action. How to build a solid state tesla coil sstc 2 by loneoceans labs. This arrangement minimizes the leakage inductance of the primary. Try not to break the bulb, you just want to crack open the plastic.
If you are here to learn how to build a sstc, you have come to the right place. Electronics projects, simple flyback driver circuit mosfet power electronic projects, simple circuit projects, date 20140621. I tried using a fast diode with a reverse recovery time of 100ns in between the source and drain of the mosfet, but that didnt do anything. It has a peak efficiency of over 93% and a power density of 18win 3. General description and circuit operation this is an efficient flyback driver for modern cylindrical rectified television flybacks. Not only the zvs flyback driver is powerful, but it is very dangerous. The flyback converter is a power supply topology that uses mutually coupled inductor, to store energy when current passes through and releasing the energy when the power is removed. The flyback transformer is only connected to the circuit through the new primary coil that we wind on the open ferrite core, the mosfet pulses the driver signal. I used a 9v battery to power the ne555 and a 24v 6a power supply to power the flyback. Cy1 and cy2 are used for further attenuation of commonmode noise, though they require an earth connection, which is.
A flyback transformer is a coupled inductor with a gapped core. The gist of it is that while one 2n3055 overheats very quickly, 2 paralleled 2n3055s will be able to split the current load and avoid overheating too rapidly. Cfl circuit flyback driver the same as 2a, however with the high voltage rectifier integrated to the secondary, so it is a dc flyback. The last part of the circuit is the flyback driver circuit as seen previously and is separated form the dc supply via a switch. The 6bg6 tube is a tv output tube that drives the flyback transformer. Using an old flyback transformer from a tv or monitor limits your frequency to about 20. Design methodology and calculations for components value selection are presented. The schematic has been updated to include basic transistor protection in the form of a capacitor and diode. Flyback driver circuit this is a instructable that contains scematic and pictures of a single transistor flyback driver. Flyback transformer driver using an electronic ballast. These are the transformers that make the high voltage in crt displays.
Universal flyback and buckboost single stage dimmable led driver a description the al1673 is a high performance single stage flyback buckboost converter, targeting dimmable led lighting application. All you need is a compact fluorescent light cfl and a flyback transformer. The magnetic field then starts to collapse and induces a voltage in the secondary that increases until its hig. Please do not build this if you dont already have some experience with high voltage electricity. How to use cfl grow lights now that you know just about everything you need to know about cfls and youve got some for your garden, lets learn some best practices.
This reference design features the ucc28780 active clamp flyback controller in a. Amongst the wide range of products for sale choice, flyback transformer is one of the hot items. The lm7812 circuitry can be replaced with a 12v battery or benchtop power supply. This circuit is somewhat dangerous, and can give you some nasty shocks and burns if you arent careful, not to mention the possibility of setting things on fire. I saw this instructable on how to make a high voltage power supply with a cfl ballast circuit and and a. Bad result from the cfl driver for the flyback transformer. Theory on leds why they need cfls to perform grasscity. Introduction a quasiresonant flyback is simply a dcm flyback having a valley switching turn on. You can easily pump several hundreds of watts into the flyback transformer and the output current would be around 50ma to 200ma or even more, which is way above the lethal rate which is 10ma.
119 105 172 14 624 1052 1168 449 1500 545 237 281 602 322 162 554 171 61 267 1261 1164 181 1454 79 1286 280 1074 557 859 717 1262