This instructable will show you how to make a cheap and simple driver circuit in order to get high voltage arcs out of a component called a flyback transformer. Mazilli zvs flyback driver kaizer power electronics wiring rv domestic electric circuit. Jul 20, 2008 so for my first real flyback driver, i built a dual 2n3055 transistor based flyback driver. The step 9 page going further now includes a way to measure th. Flyback transformer drivers uzzors2k hobby projects site. Coilcraft ga3172 flyback transformer for the microchip pfc. For those of you who have never seen a flyback transformer before. Efficient flyback driver high volts circuit using ic555. An17 flyback transformer design for topswitch power supplies. This article will be regarding the socalled flyback transformers, a wellknown term in the high voltage hobby, and their various types of construction and output. The main problem, in most cases, is that you dont know the pinout diagram of a flyback transformer. The flyback vertical portion of the sawtooth wave can be a potential problem to the flyback transformer if the energy has nowhere to go. Efficient flyback driver working on mains voltage 230v.
I spent a lot of time for finding resonant frequency around 15khz and duty cycle. The 6bg6 tube is a tv output tube that drives the flyback transformer. Oct 17, 2019 efficient flyback driver high volts circuit using ic555. My box shows the primary side voltage of the zvs driver being applied with voltage, current, power and energy consumed by the zvs driver. Flyback transformer driver for beginners diy tesla coil. 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. The flyback circuit diagram calls for two sets of coils. 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. Well, if you take a peek into every classic fat crt television or monitor, whether vintage or modern, you are going to find one. Creating the flyback driver 20khz with 90% duty cycle.
Flyback transformer driver for beginners electronic circuit projects. I build this circuit almost a year ago on a vero board, but it kept blowing the thin traces due to high currents flowing. Ga3172al specially developed flyback transformer for use with microchip pfc led driver. The energy from the inputs is stored in a magnetic field to be released to the outputs at a slightly later time.
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. Pinout for those of you who have never seen a flyback transformer before, it may be a bit tricky to know where the primary, ground and other pins are. Now your flyback should look something like the diagram shown below. With just a few additional parts, it can produce nice wavey arcs and even power a jacobs ladder traveling arc. Single transistor easy high voltage flyback transformer. 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. All parts can be obtained easily from radio shack, including the mosfet. Instead, we need a circuit to generate a high frequency as input to the primary coil. In some side notes the person said that instead they used a 2n6673 npn power transistor. A transistor driven flyback transformer page angelfire. Anyhoo, i do a lot of repairs to various electronics for work, but also for fun as a hobby. For your information, the ac pulse generated by the flyback transformer cannot be check with our normal analog or digital meter. The new flyback has two red wires and the smaller diameter red wire goes to the single pin post on the neck board and the larger diameter red wire goes to the white. Texas instruments, understanding the basics of a flyback converter.
The single transistor circuit a good candidate but there is no obvious way to limit the collector voltage. Alright so i am making a flyback transformer driver, however, in the schematic it asks for a 2n3055 transistor. I pushed it higher for short periods and it survived and gave surprising performance. Simple circuit using 1 transistor, a few resistors and capacitors to easily generate a high voltage from transformers from tvs and computer monitors. This one uses a flyback transformer without a high voltage rectifier or with the. Mazilli zvs flyback driver kaizer power electronics. Creating an electric arc ive always wanted to create an electric arc but dont know how. Im new to this forum but found you guys while googling around trying to find some answers. Flanged power transistor packing unit shell cold war world wiki mazilli zvs flyback driver kaizer power electronics wiring rv domestic electric circuit. With your meter on ac volts, measure the ac voltage on each pair of windings apart from the primary. The step 9 page going further now includes a way to measure these illustrious voltage spikes with a regular volt meter. Most of the others i had seen were simple 555 based drivers and ones similar to the single or double 2n3055 transistor design. How to find the primary and the secondary coils of a flyback.
The zvs flyback driver it is probably the most powerful and efficient flyback transformer driver that was fairly recently invented by vladmiro mazilli. The 12sq7 is a highgain amplifier that boosts the feedback signals to oscillate the 6bg6 tube. If the transformer buzzes loudly, smokes or makes noise then unplug immediately and start again. Flyback transformer design for topswitch power supplies. The main hv out on the secondary coil is a big red cable with a suction cup. The flyback transformer pinout will also generate high pulse ac which later convert to dc through an ultra fast recovery diode. Mar 10, 2015 this is a high voltage flyback transformer driver. The transformer was build up by using a ferrite e core by placing a coil around the centre limb. My 24kv high voltage jacobs ladder from diy flyback transformer driver using 555 timer. This is a much more efficient circuit, which make use of the original primary winding of a flyback. Sainsmart zero voltage switching tesla coil flyback driver. Then i come across the theory that air breaks down at about 1mvm mega volts per meter 24kvin.
The high frequency used permits the use of a much smaller transformer. When a person who has little experience in the world of projects, the information they find is critical. Oct 20, 2007 using a mosfet instead of a 2n3055 would allow you to use much lighter resistors, a 14 watt, and they could be 100 times their current resistance because a mosfet is essentially a transconductance amplifier while a 2n3055 is a current amplifier, hence the need for lower resistance values. There are many ways to build flyback drivers, but even though some of newer designs may seem more stable or effective, the 2n3055 with 2 resistors, is by far one of the more simple designs. I will explain to you nine common faults that you can find in a defective flyback.
This is an efficient flyback driver for modern cylindrical rectified television flybacks. The ground pin can be found by finding the pin the hv arcs to the most. Many sites doesnt provide circuits driving these transformers, they simply say that they are bad. Pdf analysis and design of the flyback transformer. So, i shall try to give you a simple method to find the primary coil input pins and also the 0 v output pin of the hv secondary coil. I was looking for newer flyback driver designs and came across this one after quite a bit of searching. How to find the primary and the secondary coils of a flyback transformer. 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. So for my first real flyback driver, i built a dual 2n3055 transistor based flyback driver. Transistor driven high voltage flyback transformer page.
Mar 14, 2015 this circuit uses a relatively simple transistor based oscillator circuit to drive the flyback transformer there are far more complex driver circuits out there but this circuit can be built simply with minimal knowledge and parts, most of which can be salvaged from an old crt tv. 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. Using a mosfet instead of a 2n3055 would allow you to use much lighter resistors, a 14 watt, and they could be 100 times their current resistance because a mosfet is essentially a transconductance amplifier while a 2n3055 is a current amplifier, hence the need for lower resistance values. Anyhoo when i get a customer thats got a failed lcd or plasma tv and i trace the problem down to a. I was wondering, would just any power transistor work. Simply take the hv lead and bring it near the pins on the bottom. Autodesk instructables, 2n3055 flyback transformer driver for beginners robert gawron, high voltage supply 1030kv made from crt television flyback transformer electronic repair guide, what is flyback transformer.
Flyback transformer wurth elektronik switching converter. A very simple road to your basic high voltage generator is the transistor driven flyback transformer. Tv flyback transformer replacement repair all about circuits. How to make adjustable voltage by transformer 3a with transistor 2n3055 duration. Maybe it is time to find another flyback transformer if the arcing is so severe if you have any additional questions about the zvs driver, please ask them in that article and not this for the 2n3055 driver. The danger is minimal, as fly back transformers are intrinsically low power devices, not capable of outputting lethal. Unlike a normal transformer which operates at 50 60hz, a flyback transformer is designed to operate at high frequency, so we cannot simply connect a primary on the flyback powered from the mains do not do this. The schematic has been updated to include basic transistor protection in the form of a capacitor and diode. Mar 17, 2012 this article will be regarding the socalled flyback transformers, a wellknown term in the high voltage hobby, and their various types of construction and output. How to find the primary and the secundary coils of a flyback. 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. Testing flyback transformer for computer monitor is complicated if you do not know how to test it. There are many ways as to why a flyback transformer fails. Dec 18, 2014 single 2n3055 flyback driver running at 24v.
Which one is the part number if you decide to search the internet for more information about the particular flyback. This one uses a flyback transformer without a high. With a common digital ohmeter it is impossible to find the secundary coil pinout because its resistance is much too high. A wide variety of flyback transformer options are available to you, such as high frequency, power, and electronic. Flyback transformer driver circuit diagrams, schematics. A flyback transformer, sometimes called a line output transformer are used in. This is an easy to make high voltage power supply uses the type of flyback transformer that has built in diodes, taken from a crt cathode ray tube type of tv. A flyback transformer differs from other true transformers in that it temporarily stores energy that it gets from the input voltage and current. Now we need to find the 0v pinout for the secondary coil.
How to read flyback transformer part number electronics. The schematic has been updated to include basic transistor protection in the form of a capacitor and diode, the driver will function without them but i strongly recommend using them. Thanks to lab hvps page for providing an instruction on how to find the pinout. This circuit, also incorrectly known as the 2n3055 flyback driver, bears some resemblance to. A flyback transformer is just a particular mode of operation of a transformer. Apr 15, 2019 autodesk instructables, 2n3055 flyback transformer driver for beginners robert gawron, high voltage supply 1030kv made from crt television flyback transformer electronic repair guide, what is flyback transformer. Features, specifications, alternative product, product training modules, and datasheets are all available. High voltage with a television flyback transformer. Ultra simple single transistor flyback driver circuit. Merhaba arkadaslar bu defa 2n3055 transistor ile yuksek gerilim trafosu flyback transformer icin surucu devresi yapt. So, i give you a simple method to find this 0v pin. This is an efficient flyback driver circuit, a good and fairly efficient flyback driver circuit.
These drivers were prone to failure and had high losses in. Do you know that there are many numbers printed on the sticker of a flyback transformer. May 21, 2007 my 24kv high voltage jacobs ladder from diy flyback transformer driver using 555 timer. The dc to dc flyback converter with transformer isolation was designed and the test was implemented. The flyback converter is used in both acdc and dcdc conversion with galvanic isolation between the input and any outputs. Browse digikeys inventory of flyback transformerswitching converter, smps transformers. This circuit, also incorrectly known as the 2n3055 flyback driver, bears some resemblance to the battery invertercontinuity tester which is published here. It will make a several thousanddegree continuous 2 cm plasma arc. This simple driver circuit is quite efficient if tuned correctly, and in some cases quite. Position the transformer 2 m away from the mains socket, don you safety glasses and plug in. Here are photos of my plasma globe driver and the globe in action. High voltage flyback transformer design and manufacture by. Typically the circuit calls for the 2n3055 power transistor. Standard monitor flyback transformer with new primary.
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