Asked by vnguyễn19 5 years ago
I've a transformer core like a MOT(tall but slim) and i want to make a power supply for my zvs driver with it. so what should be the number of turns on the primary and the secondary if the input voltage is 220V AC and the required output is 36 v (min 10A). also what should be the gauge of the wires to be used for winding.
Asked by jasshopper 4 years ago
I have recently made a ZVS flyback driver. I got it working and the sparks are relatively impressive compared to other drivers I have made, but the arcs I'm getting seem a lot lower current and colder than pretty much every video I have seen of the ZVS driver. I used the Mazzilli ZVS schematic, and everything meets the specs in the schematic accept for the inductor which I made from a torroid i found in a PSU by winding about 15 turns of 18 gauge wire around it. the torroid has about a half inch outer diameter. I have a 5 5 primary on the transformer made from 18 awg wire. As it stands The driver is able to produce 20 to 25 kv with a thirty volt input, but the sparks are for the most part purple (not the flame like orange I have seem people get). As I didn't have any lead acid batteries around I just used six lantern batteries in series. I suspect the problem is either the power supply can't provide enough current, but I have measured and it seems to draw about 4 amps when arcing, and from what I understand it should draw about 10 amps and try to do that regardless of the power supply. I also think it could be the inductor is the problem, since it is what provides the constant current to the primary. If anyone knows what the problem could be and how to fix it, I would greatly appreciate your advice?
Asked by Higgs Boson 5 years ago
I am getting a bit sick and tired of frying expensive parts, entire coils and sitting in stinking smoke for hours, so time to gather some new ideas from you guys ;) Problem as short as possible: I am working on wireless energy transmission. Not with the usualy distances we know from charging pads or electric toothbrushes though, I am aiming for 30cm and more of distance here. After endless hours wasted on testing different coil designs I think I got that one nailed quite good but the thing is that I seem to be unable to keep resonance under load. The coils require a very tiny window for the right operating frequency in the 40kHz range or for the other design in the 150kHz region. When the frequency shifts more than 3 or 4kHz from the resonant point the efficiency drops to useless. Since this entire thing is planned to be as simple as possible so everyone can do it I would like to prevent complicated electronics. The few I need so far are done through ready to use modules. Of course a microcontroller would be the most obvious choice here but that does not fit in as I like "old school" for this one. Two ways I considered so far with more or less success: a) Fixed frequency feed and limited output power. This works actually quite well but only allows for tiny power levels like charging a mobile phone or tablet if you have some time. Problem however is that load changes affect the frequency and without a link back to the sender the efficiency goes down and not enough energy reaches the receiver for usage. b) ZVS driven coil. So far this approach gives the best output power but also uses huge amounts of juice. Good to make a fancy glass stand for your TV and supply the power through a hidden receiver in the base of the TV but since there is no limit or link between sender and receiver it is full power only. Is there a really simple way to provide a limited amount of power together with automatic resonance keping? Next one might be a bit tricky: Is there a simple way to increase the harmonic frequencies? As we know every simple oscillator also creates and reacts to the corresponding harmonic frequencies. On the sender's side I would like to be able to not just feed the primary frequency but also one of the harmonic frequencies with a similar power level. Again without a microcontroller or extensive electronics where possible.
Asked by Downunder35m 1 year ago
Among the many tutorials for building an induction heater out on the internet, there are two primary types. Some heaters use a ZVS circuit, and are quite simple but generally limited to a power of around 1000 watts, not enough to melt most metals. Other heaters use PLL controllers and coupling transformers to add charge the primary coil/capacitor loop, and these can be much more powerful but are significantly more complicated (and expensive) to build. It seems the limiting factor in the power of the ZVS circuits is that they can use only 2 MOSFETs, and each must conduct large amounts of current. However, if these could be replaced with IGBTs, which could conduct far more current, a much more powerful ZVS induction heater could be built. Is there any reason IGBTs couldn't be used for a ZVS heating circuit?
Posted by PleaseWork55 1 year ago
Hi, I tried to build a ZVS induction heater using this circuit http://img413.imageshack.us/img413/5136/inductionm.jpg , but I had no sucess. The work coil is 10+10 turns of 22 AWG wire around an old highlighter casing, and I am powering the circuit from a working 12 volt 7ah battery. The circuit works with my flyback transformer, but does not work on the induction heater. I am using all of the standard components in the flyback circuit, but I replaced the 5+5 turn primary with a 10+10 work coil. As far as I mesured with my thermometer the temperature of the object never increases over 1 degree (I am trying to heat copper wire or a small picture nail). Does anyone have some suggestions? Edit: Sorry about the delay, but I was able to heat a large paper clip using 8+8 turns of 16 AWG wire wrapped around a glass test tube. This time I used a huge 24 volt center tap 18 amp transformer to get 12 volts.
Asked by TimTD 7 years ago
Hello, i built a ZVS driver about an year ago. I used to power it from a computer power supply at 12v ,than i changed the power supply to 30v and 10a.With the new power supply it worked as well for about 3 moths. A week ago a wire got burnt and a zenner diode. I wanted to test the mosfets too but he tests i searched on google didnt work. Please tell me a good method to see if my mosfets are burnt or not .
Asked by theVader75 6 years ago
Hello there! I want to create a ZVS induction heater but I don't fully understand yet how the coils need to be driven. I haven't started yet with building it, but I already wanted to check if the induction heating effect was working, so I connected a coil onto my high current DC blockwave generator and nothing really happens. it's a PWM controller which switches between 0V and the applied voltage. Is it because it sends DC signals to the coil, and the magnetic field goes into saturation? If so, I added a capacitor in series with the coil, to filter out the DC component but now nothing happens. There is nearly no current flowing trough the circuit. I'd also need some information on what influences the intensity of the heating? Is it the Amp*Turns that matters? because we're using high frequency here to lower the required current; but if it's amp*turns then we need the current to be as high as possible. So something's wrong there in the way I thought this works :/ I do know how the material gets heated. (by eddy currents that increase if the flux alternates at higher amplitudes) also, at what voltage should the coil be switched? does the voltage matter? Should I use something like 12v? 40v? or even 2v of I only need high current? I do know that the use of the high frequency is to increase skin effect in the material to be heated, but what other reasons are there for using such high frequency? Is it also because eddy currents will increase at higher frequency? If so, why would this happen? A lot of questions indeed :) but I'm not going to start copy-pasting the circuit, and then just being happy that it's working. I also need to know Why it works, and how! Thanks in advance, Electorials
Asked by DELETED_Electorials 5 years ago
After being done with 555oscillators and other hv projects. i am now interested with induction heater. i have seen multiple schematics on how to make them. However the parts needed are expensive. there was a similar question posted last year but did not have enough information etc. i have seen some people making the induction heater with the zvs driver of mazzilli, but did not give enough information on how to make it. i need to wind 8+8turns on a flyback transformer core and 4 turns of thick wire one the other side to give more current. 1. can i wind the 8+8 turns on a toroidal core instead of a flyback transformer core(i don't want to break it even if i have more than 5) 2. for the capacitor 0.68uf. can a big 10uf 400v~ capacitor be used instead? or should i use 3X 0.22uf 400v~ in parallel so that it don't over heat due to high currents? 3. Will 2X 12v 35Ah car battery in series be enough to power the driver? i mean, will it drain the battery too fast which will lower its life span or should i use a rewound MOT? 4. Will a 2500uf 50v capacitor connected across the power supply be needed to smooth the current or will the circuit run finely without it.
Asked by ARJOON 7 years ago
So I was playing around with my ZVS driver and I turned up the variac to 40V, getting roughly 100kV and boom the flyback caught on fire and my ZVS driver fried. So I want to build a new one that could handle around 70-100V input. I know that for higher inputs some component values need to be changed but for voltages that high, I do not know exactly what would need to be changed. I was thinking of using two STY34NB50 MOTFET's, but wasn't sure if they were the right kind.
Asked by Jimmy Proton 5 years ago
I built a tesla coil, but the output is just a little spark barely visible when i approach a screwdriver to it. primary is 5 turns secondary 500t capacitor is made from 2 layden jars spark gap is about 3mm the coil is about 15cm tall the power supply is a flyback transformer driven by the zvs at 12v What do I have to do to improve it?
Asked by theVader75 6 years ago
I am slightly running out of brain power here and get the feeling I am just running around in circles. Problem: I want to build a HV power supply delivering 10-15KV that is driven by a ZVS circuit - basically the same I used in my Induction Heating Ible. I also want to double the output voltage with a simple cascade. Goal: To get the most effiency without overheating things. Areas where my brain feels too empty from thinking: 1. I know for sure the primary of the transformer will operate at a resonant frequency but how does this affect the scendary coil, especially under load? My small scale tests showed quite severe changes in the frequency depending on the load put onto the primary... Also the output voltage shows "spikes" at certain frequencies, I assume this happens while both primary and secondary share some harmonic frequencies. 2. With a simple dide/capacitor cascade I would only get a DC output, to keep an AC output slightly more complex circuits are required. How does this affect the resonant frequency of the secondary winding? 3. Considering 1 and 2, is there a simple way of keeping both the primary and the secondary coil of the transformer in resonance regardless of the load?
Asked by Downunder35m 1 year ago
Hello, Idea: I'm trying to build a circuit which uses an OpAmp to drive 2 mosfets, which power the LC tank of an induction heater. The idea is to detect when the voltage over the LC tank crosses zero, and at that voltage I would make the 2 outputs of the OpAmp change states from fully on, to fully off. The two OpAmps (both inside one chip) have their positive and negative inputs connected to eachother, but with reversed polarity. This would make sure that one output is high, and the other one is low. Why use an OpAmp? I wanted the MOSFET gate switching to go faster as usually, because in the mazzilli circuit, the gate voltage actually slews at the same rate as the LC tank's voltage slews when it crosses zero volts. In the mazzilli circuit, it actually doesn't switch when the voltage is 0v, but when the tank voltage drops below the gate threshold voltage. This would mean that you are always switching current at 5v (for example) instead of at 0V. So for these two reasons, I wanted to try switching them with an OpAmp. Measurements: Probe I on drain 1, probe II on drain 2, and GND on the circuit's ground, gives me an expected result: when switching states, at 0 voltage of the LC tank, the voltage on one side stays low (since it's pulled to ground) and the voltage on the other side goes from 0v up to 50v, back down to 0v, like a sine-wave. Then the OpAmps switch again, and the one side now goes up to 50v as a sine wave, and the other one stays low at 0v. All good, this is working just fine. Probe I on the one differential input line, probe II on the other differential input line. Since this is nothing more than just a 1/10 voltage division of the previous measurement, I'm also expecting the signal to be exactly the same, but 11x smaller. -> problem: However, this does not happen. Because of some strange reason, as you can see in the scope images: Both channels go high, Twice per cycle, instead of going high only once per cycle, and staying low for the next half of the cycle. This really isn't good! Do the inputs affect the waveform in some way? Remarks about scope images: Image: 2 gates Blue gate voltage seems 'quite' fine. Turning on looks good, turning off is not really good becuse if tends to turn on for a short time once again, before it fully turns off. Yellow gate voltage is terrible. Turning on doesn't happen as expected. Voltage drops back to 0 for a long while which is very bad for the circuit. Frequency seems fine; 50kHz is as expected with the 14µH and 6µF. Image: 2 drain voltages These voltages were measured with a 1-10 voltage divider, and thus show only 1/11th of the actual voltage. This is getting close to what I want the LC tank to do. The voltages seem quite like sine waves. I suspect that if the gate voltages would be as they should be, these drain voltages would also be perfect sine waves. The regular sine amplitude of 50V is as expected, with a 24V supply voltage, but at the moments when the drain voltages strangely drop down to 0v, as you can see in image: '2 gates', at these moments the drain voltage seems to spike over 250V!! Image: 2 differential input lines This is the image which I don't understand. I expect the same wave as in the previous picture, but only 11 times smaller because of the voltage divider. However, the voltage does NOT reach 0v while the drain voltage does, and its shape is also completely different. In this image, both channels are doing one (half) sine wave, twice per switching period. They should be LOW for half a period, as the drain voltages do in the previous image. Better quality images: 2 gates 2 drain voltages 2 differential input lines schematic Datasheets: OpAmp: http://cds.linear.com/docs/en/datasheet/1497f.pdf MOSFETS: http://www.vishay.com/docs/91262/91262.pdf Coils and capacitors: Line inductor value: I'm not sure if this value is correct. Center-tapped main coil inductance: This value should be pretty correct, I calculated it by measuring it's size and windings, and the operating frequency is also nearly the same as the calculated one. tank capacitance: 6 times a 1µf MKP capacitor Questions: - Why these strange large spikes? - Why is the waveform suddenly different when reading it near the differential inputs? For the first time ever, I can provide you with scope images! I finally bought a (quite cheap) oscilloscope. I hope it helps a lot. Oh, and one more thing: The induction heater does actually work already. I'm getting huge currents in the LC tank, since the 6mm copper tubing gets hot after a minute. Water cooling has been added, and it works like a charm! The MOSFETS do get quite hot after 15 seconds of heating an object, or after 40 seconds of heating nothing. This, probably because the gate voltage isn't what it should be. Kind regards, Electorials
Asked by DELETED_Electorials 3 years ago
I just built a beefed up ZVS driver to handle a large continuous current, however, I now lack a power supply that will allow me to reach its full potential. The biggest thing aside from my variac that I have is two xbox power supplies in series (24V 29A). I would like something around 40-50V with at least 5A. I could rewire a mot which would take a very long time and weigh a lot so if anyone has any schematics or pointers on how to make one electronically it would be much appreciated!
Asked by Jimmy Proton 2 years ago
I asked a similar question https://www.instructables.com/answers/How-to-improve-tesla-coil-/ and I still didn't managed to get a spark. I want the simplest way to build and power this tesla coil Now I have : -5 layden jars -1 MMC -1 primary 5t -1sec 500t -1 zvs (dc out at 30kv) -1 ignition coil -5 timers -1 MOT -2 capacitors for MOT at 0.98uF -2 diodes for MOT
Asked by theVader75 6 years ago
I am currently planning a small tesla coil (15 inches high, hopefully 5-12 inch sparks) I would like to make the unit small (desktop size). I decided to build the coil around a ZVS-driven flyback transformer rather than a standard NST or Oil burner transformer due to several advantages the ZVS circuit can offer: battery operation, smaller size, simpler math, no requirement to "match" the capacitance with the transformer, and since I have almost all the parts necessary to build another ZVS driver, why not!? The ZVS driver drive a DC flyback at approximately 15KV, which will then charge a homemade capacitor (I will not invest in a true MMC because it will put stress on the capacitors and connections, not mentioning the price of better quality film capacitors.) I have determined the dielectric breakdown of a few household items (plastic wrap, lids, lunch bags, etc. I assume they are low-density polyethylene) with my ZVS singing arc assumed to be at 8-10KV, and figured one layer of 5x7 inch compressed between 8 layers of plastic wrap gives an approximate capacitance of 0.7nF (sitting flat on a table with a few books to compress the plates closer together) to 1.44nF (after being rolled up very tightly. However, the breakdown voltage of this may be too low. I have yet to test this with my singing arc project) The Capacitor will be several layers of plastic wrap sandwiched between layers of aluminum foil, which will be cut 3/4 inch shorter on all 4 sides, and after approximately 8-15 layers have been added, the capacitor will be sandwiched between 2 wooden boards with bolts on all 4 sides to permanently compress the capacitor to achieve approximately 10nF +- 5nF. This compression method might even help me fine-tune my tesla coil! the aluminum plates will be tabbed, so that when they are stacked, the tabs will face opposite directions. I might even submerge the capacitor in oil and pull a vacuum on it if I feel it will be necessary. However, I have not constructed a HV capacitor before, so I do not know how well this design will work. Does anyone have some experience in this matter? And lastly, my Power supply section to power the project: Has anyone built a ZVS-based tesla coil here? I see them all over youtube, with outputs ranging from millimeters (similar to my slayer exciter project) to over a foot long! However, they never state what their PSU is rated for, or use 12 Lead Acid batteries, which I feel would be a bit impractical. So my question is: To get the output I desire, how many volts and amps should my power supply be rated for? I am thinking either a 24V 10A Switchmode supply from amazon, with the voltage adjust maxed out, or a 28V 10.8A SMPS, or a cheaper 24V 15A. SMPS. I thought about making a unregulated supply with a large transformer and a high-amperage full-wave bridge rectifier, but this cost more, and I cant be certain on it's quality. Can SMPS be used? can the amperage be below 10A? most importantly, does anyone have good data on current draw @ given voltages @ given # of turns on the inductor and flyback?
Asked by -max- 4 years ago
I have a computer hp zv 5000, i want to up grade its athlon 1.6 processor, is it possible to upgrade to maximum what extent?
Asked by hashmi121 8 years ago
Can I use are DC Flyback Transformer for tesla coil? Just like a ZVS Flyback Driver If can please post the image. If not please explain
Asked by james34602 5 years ago
I'm planning on making a ball cyclotron as my project and i need a high voltage power supply for its working, can i use any type of high voltage power supply like a ZVS powered flyback transformer? Or is there any specific conditions for power supply to make the cyclotron work?
Asked by jasshopper 3 years ago
http://www.electroncomponents.com/Mini-Components/capacitor/Polyester-Myler-Capacitors/105-400v-1uf-1000nf-myler-capacitor Is this good for a SGTC? im using a flyback transformer powered with ZVS driver running of 30v. So im thinking of putting 60 of these is series and nothing in parallel. The secondary is 16inch long and 4 inch dia. Flat primary with 7 turns.
Asked by jasshopper 1 year ago
Currently I have developed a flyback driver that is a semi-cross between a classic ZVS circuit and a 555 type driver, mainly just using a few comparators (one to create a triangle wave and 2 others to respond to the upper and lower peaks and drive MOSFETs. This allows me to create a modified sine wave with adjustable duty cycle.) This topology is even more powerful than the ZVS driver at 12V, as I got some INSANELY thick arcs!! However the MOSFETs get a little too warm, and I was forced to use sil pads to galvanically isolate the drain from the CPU heatsink. They seem to have really poor thermal characteristics as the heatsink stays cold while the transistors get uncomfortably hot within seconds!! To make this thing operate at the resonant frequency of the flyback, I think I will a feedback coil that would get "squared up" using a resistor and zener diode. I need to convert that signal into a triangle / sawtooth wave of fixed amplitude. A simple RC type circuit is not too suitable because as the frequency goes up or down, the amplitude of the voltage across the capacitor changes proportionally.What circuit will allow me to convert a square wave directly to a triangle wave of fixed amplitude????
Asked by -max- 1 year ago
Has anyone been able to create medium sized nonexplosive EMP generator? i recently purchased 4 oil capacitors each rated around 5.5KVDC and 32uF, from what i have learned, in order to create an EMP generator, you would need a to feed it a large amount of power in to a heavy gauge magnetic coil. I believe my caps could do the trick. I will be charging them with a ZVS driver coupled to a self wound ferrite transformer, then rectified. As for discharging i' will probably use a mechanical spark gap. I am hoping to create something like the shock pulse generators in amazing1.com, does my setup look feasible ?
Posted by tazerboy 5 years ago
Alright so i made a simple full bridge rectifier (http://www.electroboom.com/?p=544) credits to Medhi Sadahagar. I modified it such that it works with 240 volts mains instead of 120 volts mains. my capacitor bank is 2.4 mF and 400 volts. However, the output is 312 volts DC and I require around 12-36 volts DC at minimum 10 amps to power a ZVS driver (by Plasmana). I tried a voltage divider but I think the power rating of my resistors was not enough as one of them heated up and broke. I need help in designing or making a suitable circuit to reduce 312 volts DC to 12-36 volts DC at 10 amps minimum. Please help me and have a great day :D
Asked by BenderSanchez 2 years ago