Transistor Tesla coil - today perhaps the most interesting topic for a builder Tesla. A lot of circuits flying over the Internet. In the most diverse elements, with a variety of engineering solutions. What is interesting about them .... The first - they are relatively low noise, when compared, for example SGTC- spark coils. Second, they consume quite modest. About 400 watts. Plc-minus ... Third, they are quite compact. Desktop, so to speak, an option. And third, they are very effective and safe, again when compared to the spark. You can easily catch the streamer hands. Well, so little pricks. Below, I will display videos of their transistor coils.
This Tesla coil in the generator, on-chip TL494 and final stage in the half-bridge transistors Chinese MJE13009. Not to be confused with the original European ST13009. Complete crap, just for this occasion. Why such a transistor ... Because, in this barbaric operation, especially at the stage of adjustment, transistors often burn out. But these - are kept. Too eager, but less frequently. And on the stage setting, resistance to burn - especially valuable. And they all cost about 45 rubles. For example, mosfety IRFP460 which will be discussed below, there are already 125 rubles. Feel the difference! So I gain experience using MJE13009. Yes, and they work well. This video is not enough to install the torus. Therefore, a bit too small streamers. Well, the food vsyotaki lower than when field workers cling ... Okay. This setting, so overclocking you begin. We continue:
This construction is all on the same generator TL494. But here I put the field-effect transistors, or as they say bourgeois, Mosfety. IRFP450. This was a breakthrough for me. Here's their fucking burned something while I was working normally coil! Well, what can I say .... But it is quite another matter! And the operating voltage of 110 volts, not 50. And already more streamers. But collecting this design, I realized that I could not stop halfway. I wanted more. Plug already IRP460, or something more
In this video, in coils, the same PWM controller TL494. To increase the current Pulses put driver IR4426 and emitter-follower transistors BD139 and BD140. Well mosfety IRFP460H. The generator frequency - 34 kHz. The length of the streamer - 18-20 cm. Earthing - bridge capacitor network 220. FETs - almost cold. I turn off the fan ... even a little about grounding. Under this option, your supply voltage are getting noisy. That is, multiple harmonics from the coil to penetrate the grid. With all the consequences ... The first way to deal with them: Installation of high-frequency power supply coil filters. This is somewhat of ferrite rings with wire and capacitors. All of this - nothing. But why the fuss, with a catastrophic shortage of money, materials, and most importantly, a place in the body of the coil! There is a second option, self-made, so to speak. Psevdozemlya! The output from the lower end of the coil wire on, say, a telescopic antenku. And put it next to the coil. Done. In his subsequent designs so I did. This antenka what else is good? The fact that this class of generators, without feedback, there is no frequency stabilization at the generator. When activated, the generator frequency, say 32KHz. But over time work, she gradually "slipping away". This is due to lack of frequency stabilization. And the fact that we walk around it, a tray different subjects and their own fingers ... All this makes a "contribution" to the change in capacitance of the coil and thus the resonance frequency. You can bring a resistor and adjust the frequency. And you can move antenkoy. That closer, farther. It is possible and even it together. This antenka and convenient. Two bunnies kill ;-) In general, the benefits of such structures: fewer parts, simpler scheme. Less: "plvaet" frequency. Maybe so, "sail" that mosfety intended for use at high frequencies, a burn, with decreasing frequency coil. Therefore antennkoy and resistor must be used with some caution. What can I say more .... All these schemes operate in CW - Mode. That is, continuously feeding the pulses from the generator to the keys MOSFET. In this mode, the terminal transistors (Mosfety) heat up quickly and can get out of the Story. And streamer give short and fluffy. Nope angrily popping digits long. The signal should be in any somehow tear. Or at least to interrupt the power transistors themselves, if not tearing signal device. By the way, it is called interupter. And build on different generator chips (you can transistors). This generator - frequency controlled and low. And inserted a signal from vomiting interaptera circuit manipulated the main generator (if any). But this complicates the circuit. Therefore, in pursuit of the result, I did not bother to interaptere, but just put a half-wave rectifier power supply mosfetov. It turned out the following: The lower part of the sine wave AC voltage, cut off a half-wave rectifier. Upper left, the positive part is not a sine wave, and a sort of her scraps. And the food has gone half-hearted and faltering. That is not the signal coming to mosfety rvёm and self catering mosfetov. But anyway, and the result obtained. A broken zipper. And effectively and economically in the rectifier diode D232 I applied without smoothing capacitors. Power, of course, divided in half, but the result came - clearly angry popping streamers, longer than in the CW mode. Well, by hook or by crook ... Next video - the same pattern, only this time performed on a signet, and tucked into the body. In general, driven to the presentation. Take a look:
The side of the antenna coil and is a pseudo ground. During the work of the coil, a couple of times I antennku moved closer. Next video - the new and to date, the latest design yet SSTC. I decided to make a full bridge and the normal circuit breaker! I have to say: Do not get burned ... Bridge. As soon as the voltage is increased pressure for more than half of the previous design, all four mosfeta burned .... Altered back to the half-bridge ... Maybe transistors insufficient power ... AND chopper failed. That is, in principle, work ... I ... I found this in the net, to what conclusion chip TL494 can be supplied with a chopper signal collected on 555m timer via optocoupler. But! On the oscilloscope, signal turns on the front was a clear spike amplitude several times greater than the actual signal. I was even afraid to be connected to the final stage of this design! Refused. And he built another coil, also without a chopper and half-bridge. However, I have applied the framework for the secondary smaller diameter. And as a torus used a large Christmas tree decorations in the form of a ball. In the Chinese market purchased. Aluminum tape stuck to it, and brought the top terminal. Not bad happened, it seems ...
The same reel, but in the housing. Dowry her trademark look. It works great.It pleases me and many of my friends and visitors who come to see me for a miracle. The spectacle of course, beautiful.
Photos half-bridge coils on mosfets IRFP460 With flat toroid and ball.
In recent years, due to the unattractiveness of flat toroids, I became more and more inclined to traditional Tesla - spherical resonator. And beautiful, and not to make an example of how easily ,,, strangely. Buy a round luminaire from those stairwells shine rather not buy himself a lamp and ceiling. Or diffuser. Now they spolsh and some are made of matte plastic. Cropped neck slightly, stuck to its aluminum tape. On top of a knitting needle strengthened. And you're done! Cool resonators obtained in my opinion. I put them on all their SSTC-coil. On Katscher come up with something else. For example, Christmas tree ornaments in the form of Chinese plastic balls besiege aluminum tape ...
He made another coil and immediately put it on the ball.
В последнее время, из-за неприглядности плоских тороидов, я стал всё больше склоняться к традиционно Тесловским - шаровым резонаторам. И красиво и изготавливать не в пример как легче,,,как ни странно. Покупаю подездный светильник, из тех, что на лестничных клетках светят, вернее не сам светильник покупаю, а плафон. Или рассеиватель. Сейчас их сполшь и рядом из пластика матового изготавливают. Обрезаю горловину слегка, облепляю его скотчем алюминиевым. Сверху спицу вязальную приделываю. И готово ! Классные резонаторы получаются по-моему. Поставил их на все свои SSTC-катушки. На качеры придумаю ещё что-нибудь. Например, игрушки ёлочные пластиковые китайские облепливать скотчем алюминиевым...
Сделал ещё одну катушку и сразу же поставил на неё шар.
And this little experience of doing almost anything. With the help of adhesive tape fastened incandescent lamp socket to the terminal and vlkyuchaem coil.