Flyback driver using cfl

Drvs source capability as v gs is around v gs,miller is important. Finally, the pic18f4550 microcontroller was programmed to undertake control tasks of the led driver. There are actually two conditions here, for the primary and secondary sides in a flyback, but they are related through turns ratio so we can use either the secondary or primary sides to do the calculations. They are small and compact, and you can take them out from an old computer monitor or tv. Most of the people in the 4hv community use the mazilli driver to make flyback transformers also known as line output transformers lopt from tvs and computer monitors. This reference design describes an 18w power supply for driving a string of leds 3. To allow higher voltage inputs and bigger power outputs, get a separate 1216v dc supply a few watt transformer, e. One pin will be the high voltage ground the other two pins will be that of the primary coil that will connect to the cfls electronic board.

However, in where i live in, it is difficult to obtain such a smpsu. Flyback smps using a microcontroller as control unit. Im trying to build a hv generator and for the purpose im using cfl driver 11w400v and a flyback transformer. Very easy hv power supply, you only need a television flyback and the circuit from a cfl lamp. Flyback transformers are a great way to make a nice big electrical arc, but.

The schematic has been updated to include basic transistor protection in the form of a capacitor and diode. Make a high voltage power supply using a cfl lamp and a flyback january 2020 enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on youtube. Therefore, the requirement of the led drivers is specialized power supply. Flyback transformers are found in tvs and crt monitors. The flyback converters are similar to the booster converters in architecture and performance. Hello just as title says, i need to know what material is used for the core of a flyback transformer.

Addition of triac can enable dimming function of led light. Department of energy as well, making it a very attractive option for offline ledbased light fixtures under 50 w. He uses an electronic ballast intended for fluorescent light use to drive the transformer. Simple triac dimmable compact fluorescent lamp ballast and. 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. Transistor driven high voltage flyback transformer page.

Common methods include using a transistor style driver, or zero voltage. This flyback pfc topology provides isolation and uses quasiresonant mode control. 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 challenge with the flyback transformer is to find 3 pins out of 10 to 20 pins. My multimeter is dead so ive found the flyback s schematic on the producer web page.

You need to connect a flyback transformer of your own see image 1. Output frequency is chosen by the flyback s primary and the cap, as usual f 1 2pi sqrt l c. High voltage from a cfl and flyback transformer youtube. 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. Now, using a large piece of insulated wire, discharge the flyback transformer by shorting the red wire to any ground. Flyback driver with mosfet z44 make 0 volt new project duration. How to use zvs driver to power tesla coils primary. 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. Der660 29 w high power factor, isolated flyback led driver with dali dimming. Ds500023apage 7 preface introduction this chapter contains general information that will be useful to know before using the mcp1661 isolated flyback converter reference design. Common methods include using a transistor style driver, or zero. It will make a several thousanddegree continuous 2 cm plasma arc. You may also want to add some highfrequency chokes as shown in the schematic below. To obtain a high frequency variable duty cycle drive signal we can use the 555 timer.

My multimeter is dead so ive found the flyback s schematic on. The targeted application for this design is t8 fixtures transitioning from standard fluorescent tubes to more efficient leds. I build this circuit almost a year ago on a vero board, but it kept blowing the thin traces due to high currents flowing. The hot can be driven by its original hot driver transistor and power supply as is after a suitable self oscillating circuit is set up with one of the former voltage secondary outputs used to. Can add pfc function without greatly increasing the cost of the system.

The first two drivers on this page drive the flyback in flyback mode, while the last two use pushpull topologies. Many sites doesnt provide circuits driving these transformers, they simply say that they are bad. This document is intended for anyone wishing to design highperformance singlestage digital flyback dimmable led drivers using the icl8105 and the isolated 010v dimming interface using cdm10v. Jul 03, 2017 hello to everybody, my name is yngvin and im new to electronics but studying hard. Pmp7672 18w primary side regulated flyback led driver for t8. Powering a cfl using nothing but a stepper motor and a flyback. As with the basic driver, heatsinking of the irfp450 is required. Tthe product has a wide operation range up to 26v of ic voltage supply and lower power consumption. Isolation must be maintained using good pcb design rules, a properly designed transformer and an optocoupler that will have the function to isolate the feedback information needed for the currentmode control loop. Cfl circuit flyback driver download again depends on the flyback, how thick is the ferrite core, secondary wire diameter, driver, etc. Designing and implementing a microcontroller based. Compact fluorescent lamp cfl and light emitting diode led are energy efficient light sources. Significant improved driver efficiency, up to 90%, compared to other conventional solutions. This is a much more efficient circuit, which make use of the original primary winding of a flyback.

Hello to everybody, my name is yngvin and im new to electronics but studying hard. An easy way to power flyback transformers hackaday. Please practice handwashing and social distancing, and check out our resources for adapting to these times. This simple driver circuit is quite efficient if tuned correctly, and in some cases quite powerful. How to measure highvoltage on ccfl inverter boards. Therefore, to let the led function, led driver is the power supply for the led. Flyback led driver introduction single stage critical conduction mode crm flyback converters require different design considerations compared to fixed frequency or quasiresonant qr flyback converters. 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. I eventually put the project in a box and forgot all about it. It does not have a builtin high voltage transformer. With its full feature set and simple application, the. 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. General description and circuit operation this is an efficient flyback driver for modern cylindrical rectified television flybacks. The problem is that the mosfet gets very hot in a few seconds.

They are usually anywhere from 14 to 60 watts, but once more, the bigger the better. Mazilli zvs flyback driver kaizer power electronics. Loneoceans laboratories flyback driver circuits gao guangyan. Compact fluorescent lamps cfl and down light are not. A pdf of the copper traces and components layout is also included for those without expresspcb.

Is dcv input on the primary winding of a flyback for lg cfl circuit flyback driver download again depends on the flyback, how thick is the ferrite core, secondary wire diameter, driver, etc. If playback doesnt begin shortly, try restarting your device. Use a flyback topology to drive custom led lighting. There is also a pushpull version of this driver, more on that can be found following this link. Finally, i have put two inline diodes to stop any ac currents flowing back up from the driver circuit. Information is presented in this application note on establishing design parameters for the power stage of an led driver. Flyback driver using cfl circuit experiments with flyback.

Make a high voltage power supply using a cfl lamp and a flyback. A very simple road to your basic high voltage generator is the transistor driven flyback transformer. So i am currently using a smaller 50w electronic halogen lighting transformer. Halfbridge drivers a transformer or an allsilicon drive.

Next, a demo printedcircuit board pcb was layout by using orcad pcb editor. The way that i wired the z axis on my 3d printer to share a single stepper driver does this. Using an old flyback transformer from a tv or monitor limits your frequency to about 20 khz. More than 50 kilovolts out of a single flyback at 20 volts input. The primary side regulation psr for led driver achieve. Ive designed a pcb for this driver which can be edited with expresspcb.

Refer to led driver based on ucc28060 interleaved acdc single stage flyback for. The inductor is not crucial, you can also use an old inductor off a pc psu filtering, using the thickest wires ther normally 5v ones. The 12v drivers for fluorescent lamps are tricky, because of the compromise between a good operating efficiency and the ability to start the lamp. Flyback transformers come in all different shapes and sizes. Do not attempt to do this as your first flyback transformer driver project, i recommend you to start with using simple 555 timer flyback drivers before thinking about building an zvs driver.

When a lighting application requires a custom array of leds, a flyback acdc driver. The voltage rise is not given by the turns ratio like in a standard transformer, but is proportional to the rate of change of current in the primary circuit. One filament evaporates and blackens the lamp, makes it electrically unsymmetric and shortens the lifetime. Cfl circuit flyback driver the same as 2a, however with the high voltage rectifier integrated to the secondary, so it is a dc flyback. Flyback transformer driver using an electronic ballast.

This driver runs cool, because its transistors are far more efficient and have the ideal design for high power switching, which bjts do not. To verify, just connect back the fluorescent tube or an equivalent the lighbulb went with or measure the primary with a scope and an appropriate probe. Use flyback converters to drive your leds electronic design. Provide isolated output for safety of led lamps leds and ac line are electrically isolated c.

Mar 14, 2015 i have also included inductors used as chokes to suppress any voltage spikes from the driver circuit. And finally, you are solely responsible for any harm to others or damage or any other problems that a zvs driver may cause. A very easy setup to get high voltage from a flyback transformer, with using the circuit of a cfl. The flyback transformers tend to hold a charge, similar to that of a leyden jar. 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 make any external hv multipliers.

The 6bg6 tube is a tv output tube that drives the flyback transformer. One of the simplest ways to make a battery powered high voltage power supply is to use a common car ignition coil. Pulling a ballast out of a spiral cfl might be a cheap and readily. A dimmable onestage highpowerfactor flyback led driver may have an efficiency of 80% at 120v ac input with 33v dc output at 350 ma, which is 11. 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. Icl8105 singlestage pfc flyback dimmable constant current. I spent a lot of time for finding resonant frequency around 15khz and duty cycle.

The necessary working voltage of 150v dc is rectified from the center tap of the mains transformer tr1 this is for 230v mains voltage if mains voltage is already 115v, the rectifier can. Converting a dead cfl into an led tubelight homemade. Pulling a ballast out of a spiral cfl might be a cheap and readily available option. Try not to break the bulb, you just want to crack open the plastic. Thats how you would wire a zvs driver to a tesla coil. Ignition coils are a type of induction transformer based on the tesla coil invented by nikola tesla in 1891. Aug 21, 2011 an arduino is quite an overkill for a flyback driver. This turns on the transistor, and current flows through the primary coil. I just realized that this device is only the zvs driver.

This is an efficient flyback driver for modern cylindrical rectified television flybacks. This circuit uses a common flyback transformer you probably have more than one in your house right now to boost typical battery voltages up to the multikilovolt range. Stages 2 and 3 dominate the switching losses of mosfet and driver. I used vegetable oil and iv been using this thing nonstop and it works great. The crt tv already contains all the needed bits to do the job. Ill show two videos in which i run a flyback from a 10w light bulb ballast and with and without a small 1kv cpacitor as big as you. Also, make sure youre grounding the flyback s secondary return point properly, whatever the driver is. Efficient flyback driver working on mains voltage 230v. I used a 9v battery to power the ne555 and a 24v 6a power supply to power the flyback. Nov 30, 2019 cfl circuit flyback driver by admin november 30, 2019 the same as 2a, however with the high voltage rectifier integrated to the secondary, so it is a dc flyback. Feb 14, 2014 an easy way to power flyback transformers. Flyback theory what is needed the flyback is the most ubiquitous in both acdc and dcdc conversion with galvanic isolation.

Output frequency is chosen by the flybacks primary and the cap, as usual f 1 2pi sqrt l c. Mcp1661 isolated flyback converter reference design user guide. Led driver based on flyback converter is simple and cheap number of component is less b. I have heard people say its made of ferrite if yes then can i use it for making transformer, i mean winding it with magnet wire for making cfl drivers. To identify the primary coil, use a multimeter to test the pins. 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. Led driver is a individual power supply, hence, it can adjust the power required for the led. And8451 power stage design guidelines for the ncl30000. Mcp1661 isolated flyback converter reference design 2014 microchip technology inc. Remember, i was only using the outer wires and leaving the two inner wires alone. Magnetics design 5 inductor and flyback transformer design. Flyback transformer driver circuit diagrams, schematics.

I saw this instructable on how to make a high voltage power supply with a cfl ballast circuit and and a. After you have selected a container to put your transformer in and have. Der857 65 w high power factor, isolated flyback with switched valley fill pfc led driver. Get a big one, the bigger it is the more powerful your driver will be. How to get 100kv out of your flyback very simple setup. This circuit, also incorrectly known as the 2n3055 flyback driver, bears some resemblance to the battery invertercontinuity tester which is published here. However, they have a disadvantage that they cannot be directly dimmed with a triac dimmer. Typical ferrite cores can handle 40 khz well with 0. I spent a lot of time for finding resonant frequency around 15khz and dutyread more.

Dr this is a zvs driver using modern high power transistors instead of the archaic bjt on the most popular flyback driver design. 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. They make the high voltage, high frequency current necessary to trace the electron beam across the screen. May 27, 2019 make a high voltage power supply using a cfl lamp and a flyback tasarruflu ampul devresi ile yuksek gerilim trafosu stay safe and healthy. Multiple safety functions ensure a full system protection in failure situations. 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 i build this circuit almost a year ago on a vero board, but it kept blowing the thin traces due to high currents flowing. Compact fluorescent lamp ballast has high voltage and current and no isolation for the technician between the ac power outlet and fluorescent lamp ballast. Whats the output of a 5 watt cfl,and anyway of converting the output from a flyback transformer driven by 5 watt cfl,,soo do i connect 10. Its always a good idea and safety precaution to discharge them, even though its unlikely to be a lethal shock. All you need is a compact fluorescent light cfl and a flyback transformer. Make a high voltage power supply using a cfl lamp and a. As well as the complexity and extra cost, i suspect that the high voltage field may leak into the arduino and kill the delicate processor, or. This driver is among the simplest, with just six components it will be able of delivering high voltage with a strong enough current for various experiments.

Coupled output filter inductor r5 flyback transformer inductor design also depends greatly on the inductor current operating mode figure 52discontinuous inductor current mode. Ultra simple single transistor flyback driver circuit parts you will need. Highpower factor flyback converter for an led driver with. Nov 09, 2018 a very easy setup to get high voltage from a flyback transformer, with using the circuit of a cfl. The pmp10116 reference design uses the ucc28063a transitionmode pfc controller to drive leds up to 700ma current from an ac input. This tube flyback driver is based on a vacuum tube tesla coil vttc and high voltage generation circuits in tube tvs. In this video i made flyback transformer driver using old cfl circuit, and experiment with this flyback arc. The flyback driver can meet energy star requirements from the u. Singlestage flyback and pfc controller for led lighting. A compact florescent lamp is one of those swirly lightbulbs. Led driver is a individual power supply, hence, it.