In this ac power supply, a pushpull oscillator drives a tv flyback transformer from an old color tv a flyback without embedded tripler. When you hook up all the components, heres how it will look like. I pushed it higher for short periods and it survived and gave surprising performance. As a last resort, you can try constructing a low powered flyback driver, like the 2n3055 singletransistor one, then powering it on and placing the anode wire close to the bottom pins. Most of the others i had seen were simple 555 based drivers and ones similar to the single or double 2n3055 transistor design. They take energy from an electrical source such as a battery, then briefly store the electrical energy in the. I had never liked throwing away interesting stuff and now was the time to. I was looking for newer flyback driver designs and came across this one after quite a bit of searching.
General description and circuit operation this is an efficient flyback driver for modern cylindrical rectified television flybacks. Low cost flyback transformer driver circuit build low. To find out more, including how to control cookies, see here. Frequency range can be increased using multiposition switch for other values of c3 capacitor,for example 2 nf for 80khz200000khz, but didnt found flybacks with so high resonant frequencies, in addition. Icstation dc 1230v high voltage arc generator zvs flyback. Can a 07 npn transistor be used as a substitute for a 2n3055 in a flyback driver circuit. Efficient flyback driver high volts circuit using ic555. The heart of the circuit is a ferritecored flyback transformer. Here are photos of my plasma globe driver and the globe in action. The term flyback transformer driver doesnt automatically mean a crt drive application, it also means a transformer in aflyback switching converter.
Electronics projects, simple flyback driver circuit mosfet power electronic projects, simple circuit projects, date 20140621 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 have its own transformer. It sounds like a over voltage protection, when you suddenly. Here is a schematic for the completed half bridge flyback driver. This driver circuit is based on the commonly used 2n3055 transistor due to it high power switching capability. While these are cheap and high temperature tolerant, they are susceptible to voltage spikes caused by the inductive nature of the load ignition coil. This circuit uses a common flyback transformer you probably have more than one in your. It was initially designed to generate high voltage sawtooth signals at a relatively high frequency. The driver portion is fully assembled not just a bag of parts. Many sites doesnt provide circuits driving these transformers, they simply say that they are bad. This circuit generates significantly higher voltages than the flyback was originally designed to produce.
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. Personally i doubt the 15cm claim, as the 2n3055 system is a highly inefficient flyback driver. It uses two 2n3055 power transistors in a pushpull oscillator configuration. Flyback transformers, also called line output transformers, are used to supply power to electrical circuits and to generate highvoltage signals at a high frequency.
Our favorite circuit is the following dctoac inverter click diagram to enlarge. Power is supplied via j1 which, in this specific design, can range from 9 to 36vdc. 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. I eventually put the project in a box and forgot all about it. If everything so far failed, i would go back to the 2n3055 2 resistor driver. High voltage with a television flyback transformer. The fact that the original part was a 2n3055, which is a relatively low voltage device, says to me its not a crt flyback application unless its driving. 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. The output voltage is close to 40kilovolts, which is enough to ionize the air without any ground nearby, as can be seen on the first picture. Flyback transformer driver for beginners with images electronic.
Both transistors 2n3055 must be mounted on large heatsinks. Flyback transformer 1nos transistor 2n3055 1nos resistor r1. The flyback powersupply architecture and operation. Schematic this circuit, also incorrectly known as the2n3055 flyback driver, bears some resemblance to the battery inverter continuity testerwhich is published here.
Flyback transformer driver for beginners transformers, circuit. The step 9 page going further now includes a way to measure th. Because they act as a transformer, there are often extra windings on the secondary coil and provide lower 2n3055 flyback for other parts of the circuit, hence the large number of pins at the bottom of the flyback and they are used to power say the vertical and horizontal deflection coils, and so on. Tv flybacks seem to perform best with this circuit, monitor flybacks dont put out as much. The single transistor circuit a good candidate but there is no obvious way to limit the collector voltage. A flyback transformer fbt, also called a line output transformer lopt, is a special type of electrical transformer. I destroyed my first one of these by pushing it beyond the stated specifications. A flyback transformer is just a particular mode of operation of a transformer. In these days, however, bjts are rarely made as power transistors.
If it is using two of them, it is very likely a royer circuit royer oscillator. The halfbridge flyback driver system including design, schematics and layout are available for use under the creative commons license. Typically the circuit calls for the 2n3055 power transistor. Hi, i have some issues with this circuit or any other circuit not working with my transformer. How to make a simple flyback transformer circuit our. A flyback transformer, sometimes called a line output transformer are used in. The inductance in the primary windings avalanches through collectoremitter as the circuit is turned off and the voltage rises, generating a ton of waste heat. I spent a lot of time for finding resonant frequency around 15khz and dutyread more. I have 2 tip35c transistors and some 2n3055s, both of which seem to be working with maybe only minor damages. 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. I have a flyback transformer that i got out of an old crt monitor. The 2n3055 is not really very good at high frequency switching, so not having any is not a disadvantage.
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. I used a 40 watt transformer which couldnt supply enough current to. It will make a several thousanddegree continuous 2 cm plasma arc. This is probably the most well known flyback transformer driver circuit. Icstation dc 1230v high voltage arc generator zvs flyback driver kit for sgtc marx generator sold by icstation arrives as pictured on amazon. Or until the circuit is interrupted video of it working. You can use any highvoltage ac power supply to drive the multiplier. Low cost flyback transformer driver circuit build low cost high voltage spark generator monday, december 25, 2017 praveen s. In fact you can even use a 12w for the 27 ohm resistor, but it. In fact you can even use a 12w for the 27 ohm resistor, but it may burn out if it is left to run for a long time. A very simple road to your basic high voltage generator is the transistor driven flyback transformer. Apr 12, 2019 flyback transformer driver for beginners. Flyback driver circuits high voltage with a television flyback transformer.
Note that the circuit with two transistors is not a flyback converter, so you would need a lot more turns on the secondary if everything else were similar. Flyback converter the isolated flyback converter is a buckboost derived topology with an isolation winding. 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. The topological structure of flyback converter consists of a flyback transformer or coupled inductor. Flyback transformer driver for beginners transformers. Dec 8, 2018 flyback transformer driver for beginners. The step 9 page going further now includes a way to measure these illustrious voltage spikes with a regular volt meter. Transistor driven high voltage flyback transformer page. Simple circuit using 1 transistor, a few resistors and capacitors to easily generate a high voltage from transformers from tvs and computer monitors. Unlike the simple 555 timer flyback drivers, the zvs flyback drivers will allow you to run your flyback transformers for much longer periods of time before the mosfets overheat. This circuit, also incorrectly known as the 2n3055 flyback driver, bears. Pretty much any power transistor, igbt or mosfet can be used in this circuit as.
This is an efficient flyback driver circuit, a good and fairly efficient flyback driver circuit. Loneoceans laboratories flyback driver circuits gao guangyan. 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. And, since i had this, i decided to make a driver, and, eventually, a jacobs ladder. Say if you had a 33 ohm and a ohm resistor they would still work fine for this circuit. If any one has any ideas i would like to hear them. When a person who has little experience in the world of projects, the information they find is critical. My previous experiences with flyback drivers were not very good, as they were all 2n3055 drivers. This driver rectifies mains and produces a 320v dc source.
The circuit can be optimized by varying the number of turns and the resistor values. Well, after fiddling with zvs drivers and similar halfbridge circuits i have returned back to the original 2n3055 driver approach. Then jan martis, a czech experimenter, came up with an idea to increase the efficiency of these flyback topologies. I am in the process of building an 3 isolated and interleaved flyback circuit, and unless i have seriously misinterpreted the specs, a 500w transformer can be less that a cubic inch, whereas a 500w 5060hz iron cored trafo would be something like 8inches cubed. Quite some time ago i was rummaging through my parts bin and came across some flyback transformers from old cathoderaytube tvs i had taken apart. Half bridge flyback driver with over current protection. This is the modified 2n3055 flyback driver, as you can see, it provides a good power supply for experimenting with very high voltages and lower currents for example, strong static fields or x. The output high voltage depends on the type of flyback and the supply voltage, but should be on the order of 1030kv.
All parts can be obtained easily from radio shack, including the mosfet. The schematic has been updated to include basic transistor protection in the form of a capacitor and. In modern applications, it is used extensively in switchedmode power supplies for both low 3 v and high voltage over 10 kv supplies. If you get really good mosfets, it might be even possible to run your zvs flyback driver infinitely.
Do you mean a flyback transformer out of a crt tv or. Different capacitors were tried, ranging from 10 nf to nf, nf was found to work the best for my flyback transformer. The schematic has been updated to include basic transistor protection in the form of a capacitor and diode. Build a fly back transformer driver circuit diagram. 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. Mazilli zvs flyback driver kaizer power electronics. I decided to use the 2n3055 push pull flyback driver, as it would be at least somewhat better than using just the single transistor 2n3055 flyback driver, and the parts would be easier to get and put together in a short period of time it was. You know you have found the right pin to which the anode makes a continuous arc. Create high voltages with a flyback transformer driver feb 2015.