This is because, in a regular zvs driver, if you want higher voltage, you. 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. 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. From my electronic goldmine order, i received the two mosfets i needed being irf640s.
How a zvs flyback driver circuit works and how to build one. Heres how i managed to create a zvs driver and not electrocute myself in the. Mazilli zvs driver is a selfresonant, pushpull, free running oscillator that uses a transformer to generate high voltage. Because it achieves zero voltage switching, it is generally called zvs. In this post, i will show my diy zvs flyback driver high voltage generator. Eirik uzzors2ks more power zvs flyback driver scroll down to more power direct ac drivers. Usually in a driver transformer system like that the weaker side most of the times is the transformer. This modified driver is capable of working at much higher frequency than the original. This is because, in a regular zvs driver, if you want higher voltage, you have to feed the driver with higher dc voltage, but this also increases the current through the primary and saturation may happen. You need to connect a flyback transformer of your own see image 1. But in this case, i will use it to drive a flyback transformer to. Jun 10, 2012 my attempts at winding a step up transformer also resulted in a step down transformer due to lack of wire. This driver rectifies mains and produces a 320v dc source. May 20, 2017 in this video, i explain how the circuit of a zvs flyback driver works.
This page will focus primarily on the design and construction of a halfbridge flyback driver. Or until the circuit is interrupted video of it working. This driver is very efficient since the two switching. Efficient flyback driver high volts circuit using ic555. You may also use the zvs flyback driver with a ferrite core and a custom made hv secondary, see this article. I build this circuit almost a year ago on a vero board, but it kept blowing the thin traces due to high currents flowing. My attempts at winding a step up transformer also resulted in a step down transformer due to lack of wire. The scariest voltage output ive ever got out of flyback transformers heres an insanity a twin flyback zvs driver driving two dst television flybacks with secondaries in series, with the driver. Mazilli zvs flyback driver kaizer power electronics.
Ucc28780 high frequency active clamp flyback controller. To the right exists a simplified version of the oscillator, so take a good look. How a zvs flyback driver circuit works and how to build. The zvs driver circuit is a royertype pushpull oscillator with a resonated primary that is implemented with fets. The zvs driver can actually also be used to make an induction heater. I made this zvs driver with most of the componets from pc motherboard and pc power supply.
Well, after fiddling with zvs drivers and similar halfbridge circuits i have returned back to the. I ordered the components for making a mazzilli driver. Zero voltage switching driver and flyback transformer for generation. Ive already posted a zvs driver in the forumswith that wimpy mosfet hes got there. You can easily pump several hundreds of watts into the flyback transformer and the output current would be around 50ma to. I decided to try a high voltage flyback transformer and it works very well. Power converters free delivery possible on eligible purchases. 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. The mazilli zvs driver, also known as the royer driver, is a self resonant, pushpull, free running oscillator that uses a transformer to make a high voltage. Powerful zvs flyback driver circuit high voltage circuits.
Usually in a drivertransformer system like that the weaker side most of the times is the transformer. Its very useful if you are looking for high voltage. The flyback is a device that gets a lot of people really. Thats how you would wire a zvs driver to a tesla coil. 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. Nov 19, 2015 khalil elbaggaris mazzilli zvs driver.
It has high power, emit a little heat and high reliability, it is widely applied to drive sgtc, jacob high ladder, marx generator, induction heating etc. All parts can be obtained easily from radio shack, including the mosfet. This driver will push as much power as it can, so be sure to use flyback transformers that can handle the abuse if you want it to live. Heres how i managed to create a zvs driver and not electrocute myself in the process. Icstation dc 1230v high voltage arc generator zvs flyback. It does not have a builtin high voltage transformer. 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 step 9 page going further now includes a way to measure these illustrious voltage spikes with a regular volt meter.
The flyback converter is a buckboost converter with the inductor split to form a. Zvs flyback drive circuit output voltage is up to 800 times of the input voltage this flyback drive circuit, which is used to drive the ignition coil, has zero voltage switching, so it is called as zvs circuit. The step 9 page going further now includes a way to. Active clamp flyback 3 i m v gsq2 v dsq1 i d zvs eliminates switching losses and reduces emi with proper control of the clamp which allows zero voltage switching zvs to be achieved. 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.
Zvs driver module adopts flyback circuit, and it can be used for driving fbt flyback transformer. A zvs driver is a very simple circuit that can oscillate a large amount of power with about 90% efficiency. I have been doing a lot of research on this site regarding flyback transformer drivers. It can also drive a highcurrent aircore work coil for an. 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. 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. I built the mazzilli zvs flyback driver earlier today and it seemed to work fine for all of a minute or so. Instead, we need a circuit to generate a high frequency as input to the primary coil. As a result, i decided i would try a mazzilli zvs flyback driver. Finished zvs tesla coil power boost high voltage generator drive plate induction heating module production this is the design of a foreigner flyback driver circuit, used to drive high. The flyback converter is used in both acdc and dcdc conversion with galvanic isolation between the input and any outputs. With a 28v, 20a supply and eight windings on the primary, i was getting 1 of arc. The zvs flyback driver it is probably the most powerful and efficient flyback transformer driver that was fairly recently invented by vladmiro mazilli.
Aug 21, 2011 the next step building the flyback driver. This driver is very efficient since the two switching devices are driving a parallel lc tank at its resonant frequency. Improves efficiency over traditional flyback converters by recirculating the leakage energy and delivering it to the output instead of dissipating it. 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. I just realized that this device is only the zvs driver. Below is a youtube video of the oscillator powering a flyback transformer at 12, then 24, then 36v. Typically using old crt flyback transformer it can deliver more than 7000 v and normally its depend on configuration of flyback transformer primarysecondary winding. Pdf zero voltage switching driver and flyback transformer. I think the origins of the peculiar zvs design i was using was as a flyback driver, so it was originally connected to a centertapped transformer. An easy way to power flyback transformers hackaday. Or you can use a secondary with only a few turns of tick cooper wire, to get a current so high. Diy zvs flyback driver high voltage generator the eecs blog. I go in depth in my explanation of the different circuit elements and how they. How to use zvs driver to power tesla coils primary.
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. The schematic has been updated to include basic transistor protection in the form of a capacitor and diode. The output voltage from the zvs driver and flyback transformer to the plasma torch quartz tube was determined using falstad circuit simulation. The 12sq7 is a highgain amplifier that boosts the feedback signals to oscillate. Zvs zero cross voltage switching flyback transformer driver, capable of generating high voltage and frequency driven by 2 power mosfet.
Half bridge flyback driver with over current protection. Introduction i wanted to design a versatile driver circuit that could drive a half or fullbridge of mosfets or igbts through a gate drive transformer gdt. But in this case, i will use it to drive a flyback transformer to make high voltage. The scariest voltage output ive ever got out of flyback transformers heres an insanity a twin flyback zvs driver driving two dst television flybacks with secondaries in series, with the driver transformer method more than 75 kv output, arcs ignite at 1516 centimeters. Yung buck converter ginamit kong driver sa flyback transformer, then. The completed flyback driver with a conservative current limit and driven with 36v on the bus was tested. If you get really good mosfets, it might be even possible to run your zvs flyback driver infinitely. You may also want to add some highfrequency chokes as shown in the schematic below. I go in depth in my explanation of the different circuit elements and.
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. Any switchedmode power supply that gets its power from an ac power line called an offline converter requires a transformer for galvanic isolation. Flyback transformer driver circuit flyback driver from tv. Below is a youtube video of the oscillator powering a flyback transformer at 12. Most tv flyback transformers will by fried by the high current so a current limiter is a must have when. Not only the zvs flyback driver is powerful, but it is very dangerous.
I already had the zvs module, a good flyback transformer with built in hv diode, and lots of hv cables. In the video below you can see a demonstration of the arcs produced by the transformer and a jacobs leader. This should make a driver that is able to run flyback transformers found in crt tv sets and compute. 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.
Most tv flyback transformers will by fried by the high current so a current limiter is a must have when you play with zvs. 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. Driver pulls 6 amps, not much compared with induction heater over 11. A zvs driver is a very simple circuit that can oscillate a large amount of power. Hello, i am designing a high voltage power supply using an ac flyback transformer and a zvs driver. In this video, i explain how the circuit of a zvs flyback driver works. It can also drive a highcurrent aircore work coil for an induction heater. This is an efficient flyback driver circuit, a good and fairly efficient flyback driver circuit. The main advantages of this driver are simplicity of the circuit itself, very high efficiency and easily obtainable parts. The 6bg6 tube is a tv output tube that drives the flyback transformer. You may also use the zvs flyback driver with a ferrite core and a.
293 253 1481 1405 276 379 1472 251 956 628 814 1056 323 206 1488 1155 496 1011 844 752 629 359 589 1023 153 957 1291 855