Solid state tesla coils, in their earlier stage see my old projects were basically just a power amplifier driving a secondary coil at resonance. The mosfet driver rapidly transitions the transistor from the off state. Easy sstc, slayer exciter on steroids in this instructable, ill show you how to build a really powerful version of the slayer exciter circuit. The maximum voltage that these drivers can handle is 35v. Why is this a bad mosfetdriver for a tesla coil, what does.
Design of solid state tesla coil using 555 timer and irfp460n mosfet soumyadeep sarkar department of electrical and electronic engineering eee, kurukshetra university, kurukshetra. Using 555 pulsed circuit with mosfet driver irfp450 and paralleled auto ignition coils, upright oil filled type. Sct2450kec power mosfet, 10a, 1200v this circuit is pretty simple. Unlike a conventional dampedwave tesla coil, the solid state tesla coil is capable of producing considerable amounts of sustained rf power.
Jan 20, 2017 below are the specs for a mini, medium, and large coil. In my previous post i discussed my build of the slayer exciter tesla coil. Igbt ngtb40n120fl2wg from on semi and ir2153 from infineon semiconductor are important parts of the circuit, ir2153 is a gate. Equations used here will be based on those from the thread micro, mosfet, and dc motors, but will be rearranged and reformulated to better reflect mosfet datasheet parameters. Feb 25, 2017 the mosfet driver rapidly transitions the transistor from the off state, to the saturated state, without spending any time in the middle. In this case little current flows through the freewheel diodes if the driver is tuned to a frequency below the resonant frequency of the tesla coil, the load current changes direction before the dead time. Blew my first mosfet, but it seems like it shouldnt have. Blew my first mosfet, but it seems like it shouldnt have blown the way it did read 599 times curtislemay. Unlike sparkgap or vacuum tube tesla coils, building an sstc is not as. Many alterations were done to the original design to increase the efficiency and usage of the device.
The first tests seemed promising, however the breakout needed to be instantiated manually using a screwdriver. Solid state tesla coil burning mosfets electronics forum. The ne555 ic drives the mosfet gate directly, and its duty cycle and frequency are. The sisg circuit is slightly modified from the one we use for tesla coil service becasue of the low resonant frequency of the gauss cannon circuit. The main component in this circuit is the secondary coil golden colour, which is made by winding a magnetic wire enamelled around a cylindrical. Sparks as long as 8 inches are possible with a powerline consumption of 2 amps at 120 volts see. The first design was based around two irf740 mosfet devices made by international rectifier. Hello good sir, how do we determine the value of the base resistor. If the driver is accurately tuned to the resonant frequency of the tesla coil, then the load current will be near zero during the deadtime. The optoisolator and power mosfet should be shielded in the presence of high electric and magnetic fields, at least in an aluminum box. Using a single mosfet irfp 460 in an armstrong oscillator, i was able to obtain my first sstc light, accompanied by a powerful rf field. A solid state tesla coil is made by four main parts.
The solidstate tesla coil is by no means as spectacular as capacitivedischarge tesla coils but it gives just as good, or better, performance as a vacuumtube tesla coil. With the circuit tuned well, i can get hot streaming arcs up to 910 cm but having problems with arcing from the hv out terminals to the primary coil terminals on top, very bad on one of the coils where there seems to be a small. The main difference between a sstc vs a sgtc is that the sstc has no spark gap an instead uses modern transistor technology to switch the current in the primary coil. Halfway report on building a tesla coil and driver electroboom. The sstc 4 singlepcb tesla coil was developed as a fullfeatured allpurpose solid state tesla coil platform for building a compact yet powerful fullbridge coil, all on a single pcb. It is operating as a fixed 50% duty cycle half bridge switcher.
It assumes that you have read the previous section about the load presented by a tesla coil to the driver. This weekend i wound by hand, of course my first proper tesla coil secondary. While fiddling with the antenna, i accidentally burnt both of the mosfets. Hi, i know this is a quite an old article, but i would like to ask a question about the driver. An ignition coil or spark coil is nothing more than a low frequency autotransformer with a relatively high turns ratio. I have a tesla coil driver, designed around a ucc21520 isolated gate driver. Jiayi diy mini 20w tesla coil plasma speaker music tesla wireless transmission test. Ignition coils are a type of induction transformer based on the tesla coil invented by nikola tesla in 1891. The above circuit quickly frys mosfets at 60v power supply.
For clarity, it omits the decoupling capacitors, indicator leds, and power supplies. This design is powerful enough to be considered an sstc, or solid state tesla coil. There does not appear to be any actual real design effort going on anymore, like it did thirtysomething years ago, and shortly after power vacuum tubes for awhile began to replace rotating tungsten spark gaps as the primary interrupter. I was trying to beef up my tesla coil driver and there were a few. Simply put, a normal solid state tesla coil sstc is simply a power amplifier driving a primary coil at the resonant frequency of the secondary coil. Jun 30, 2015 some years back i made a basic ignition coil driver with a power mosfet and not much else. The ucc372x is a normal and inverting mosfet driver ic, you can also use other mosfet driver ics, just be sure to get some of atleast similar rating. Mar 01, 2019 a good ic highsidelowside driver takes care of this for you. The most common method for switching power into the resonator is a halfbridge or fullbridge of transistors typically mosfets or igbts for their high power capabilities.
Im trying to build a 2n39042n3906 mosfet driver based on the same design, but at. I am trying to choose the best mosfet for maximum output. Equations used here will be based on those from the thread micro. They generate arcs roughly 1cm2cm4cm and draw around 0. Sstc 4 single pcb full bridge sstc loneoceans laboratories. My primary requirement for the control circuit was that it shall lock on to the resonant frequency of the secondary coil. With a safety margin, the operating voltage can be 32v. It will work at 24v also, but expect the spark to be half the size. There is a reason guangyan used igbts in his design.
Dissipation it is quite a challenge to make a wellfunctioning teslacoil. Nov 12, 2018 a half bridge, solid state tesla coil driver is designed and made. Ive also tried a mosfet based circuit driven by a 555 timer and a mosfet driver. It is used to produce highvoltage, lowcurrent, high frequency alternatingcurrent electricity. The basic circuit for applying pulses to a coil is shown in figure 4. So let us understand how it works and learn how to build it. My tesla coil driver is a single resonant solid state driver.
It is actually a white pvc pipe covered by a lot of enameled wire. Design of solid state tesla coil using 555 timer and. Halfway report on building a tesla coil and driver. High voltagecurrent half bridge driver using ir2153. The gate charge of a power device can ranged from a few nanocoulombs to several microcoulombs, corresponding to capacitances up to the microfarad range. Controlling igbt and mosfet ignition coils all about.
Why is this a bad mosfetdriver for a tesla coil, what does one. The mosfet driver rapidly transitions the transistor from the off state, to the saturated state, without spending any time in the middle. As mentioned, the secondary circuit is a coil of wire, one end of which is grounded, and the other end is connected to some kind of topload metallic volume at the top of the tube. A tesla coil is an electrical resonant transformer circuit designed by inventor nikola tesla in 1891. My schematic editor is limited and thats the best i was able to do. One output goes directly to the ucc mosfet driver via a 5k resistor, and another output simply lights an indicator.
I no longer believe its necessary to drive the gates to 30v unless you are absolutely pushing the igbt to the extreme. Here is an approach to quantitatively screen for a mosfet most likely to match requirements. I have built a very similar driver circuit for my tesla coil, and it works ok, but i am getting relatively small sparks and the mosfets seem to be heating up quite a bit at only 10% duty cycle, 330volt bus and active cooling. It also seems accurate to me to call it a continuous wave type driver, as it drives the primary with a continuous ac voltage although not a clean sine wave.
This revision was developed as an improvement over my reliable and proven sstc 3 halfbridge platform, and builds upon it with many improvements. Igbts have a fixed voltage drop, however, so the power dissipation is only p i v. The transformer typically has only a dozen or so turns on the primary but many thousands on the secondary. This is the detail of how to design a good solid state coil driver. Otherwise only a very breif positivegoing spike will result, as the the internal body diode and the other 1n4005 diode would clamp the ringing. The ne555 ic drives the mosfet gate directly, and its duty cycle and frequency are controlled by trimmer resistors on the opposing side of the pcb. Firstly, the base of the secondary became very hot due to the high rms current flowing through the fine wire. Feb 23, 2018 hello my dear friends in this video i am going to show you how to make tesla coil and thanks for watching please like share and subscribe to this channel. Like all tesla coils, a solid state tesla coil sstc is a type of high frequency resonant transformer which can step up a low voltage dc input into a very high frequency ac output. High frequency solid state tesla coil hf sstc pocketmagic. One side is connected to ground, high voltage comes through the other side. The concept is proved using the national instruments mydaq as the controller and oscilloscope. Tesla coil 2 building electrobooms sstc driver tesla coil 2 building electrobooms sstc driver. Controlling igbt and mosfet ignition coils all about circuits.
They can also be used in tuning and optimizing larger units at reduced voltage and power levels. The 74hc14 is the correct ic you found, it is just the individual gates that are drawn for simplicity in the schematic. It can throw really hot electrical arcs of plasma over 3. The circuit is only ran up to about 30v supply for the coil primary high voltage rating of the mosfet is required to handle the flyback pulse. The circuit i made works and can output music, but it is very hard to tune and operate and can blow up easily too. A half bridge, solid state tesla coil driver is designed and made. My first tesla coil mosfet version silicon junction. Design of solid state tesla coil using 555 timer and irfp460n. Drsstc driver guide onetesla diy tesla coil kits home page.
If i am using a different voltage power, and different transistor some. The tesla coil is an air coiled transformer which gives high frequency current and voltage output. The two switching devices are connected in a half bridge configuration as shown in the schematic below. The diode d, provides a path for current to flow from the inductive coil when the mosfet is turned off. First thing, the size limit for the lenght of the secondary coil is four times the diameter of the tube, for an example, if you have a 4inch tube your coil lenght can be 16inch maximum lenght. Full bridge for tesla coil blowing mosfets need help on. Ignition coil driver circuit a high voltage power supply one of the simplest ways to make a battery powered high voltage power supply is to use a common car ignition coil. Design of solid state tesla coil using 555 timer and irfp460n mosfet soumyadeep sarkar department of electrical and electronic engineering eee, kurukshetra university, kurukshetra abstract.
This solves problem number one in the slayer circuit, and means we can deliver much more power to the coil with a lot less heating. High current and high voltage igbts are used to serve high power requirements. Solid state coil driver theory richies tesla coil web page. The solid state tesla coil is a device which is capable of producing extremely high voltage, high frequency and low amperage alternating current electricity. Igbt based half bridge board has been designed for multiple applications, like induction heater driver, tesla coil driver, dcdc converters, smps etc.
It has several advantages over the more common spark gap tesla coil. Tesla experimented with a number of different configurations consisting of two, or sometimes three, coupled resonant electric circuits. The circuit diagram of mini tesla coil project given below is very simple. And sometimes the intrinsic body diode of the mosfet will conduct to absorb voltage spikes, but i would not rely on that. Apr 30, 2015 hi mate, im a tesla coil lover like you and i think i can contribute for your beautyful coil. In the center section of the box is the flyback on the right and the sisg circuit board on the left. The input to the gate driver is set at 24vdc, so that a 1. At the high currents seen in a tesla coil hbridge, the mosfet acts as a resistor, and the power dissipated is p i2 r. The basic purpose of a drsstc driver is to generate the drive signals for the inverter, synchronized with the zero crossings of the primary current. The picture opposite shows my solid state driver board connected to the tesla coil primary winding. Note that sstc operation differs slightly from spark gap tesla coils or the newer double resonant solid state tesla coils, where the primary circuit is also oscillating at a resonant frequency similar to the secondary coil.
The purpose of the series 1n4005 diode is to allow the coils primary to ring at a couple hundred volts when the mosfet enters cutoff or turns off, allowing time for a spark to form at the output. At 30v and with a 300 ohm resistor replacing the 700 ohm resistor, it works well. Jul 25, 2019 igbt based half bridge board has been designed for multiple applications, like induction heater driver, tesla coil driver, dcdc converters, smps etc. Music, magic and mayhem with tesla coil electroboom. How to build a solid state tesla coil sstc 2 by loneoceans labs. The above is a stylized schematic of the onetesla driver.
Above the battery is the mosfet driver board to pulse the flyback. One output goes directly to the ucc mosfet driver via a 5k resistor. Using power mosfets to drive resonant transformers tesla. Sparks as long as 8 inches are possible with a powerline consumption of 2 amps at 120 volts see fig. As mentioned, the secondary circuit is a coil of wire, one end of which is grounded, and the other end is connected to some kind of. Chapter 7tesla coil driver 73 finally, resistors r1 were added to discharge the capacitor bank. An emitter follower behind a high power mosfet driver ucc2753x has very little delay and can be used at very high frequencies. There are many possible configurations for the solid state driver, but the following sections describe the behaviour of a simple halfbridge switching arrangement feeding.
The gate driver section is now very robust, using 16a pn mosfet pairs. Gate drive design one important parasitic in power electronics is the parasitic capacitance formed by the gate metal layer, the gate oxide, and the body of the transistor. It works up until the supply voltage approaches max gatesource voltage. The following driver changes its frequency based on what the antenna gets from the tesla coil. Power mosfets are quite suitable for driving small resonant transformers and tesla coils at frequencies up to about 200 khz. Apr 02, 2019 the above circuit is a working tesla coil driver. This project is intended as the high voltage hbridge of a 300khz tesla coil, although it could be used for other things. Tesla coils, yet they can still achieve a respectable output. At full voltage of1700 v, the power dissipation on each side is p v2 r 17002 70000 41 w 1 or about 20 w per resistor. Tesla coils solid state tesla coils sstc blew my first mosfet, but it seems like it shouldnt have blown the way it did. A tesla coil is essentially an aircored, stepup transformer consisting of driver circuitry, a short thick primary winding and a distinctive tall secondary winding usually consisting of between 4001500 turns of thin wire depending on the frequency of the coil. This is because driving a highcapacity fets gates is not easy at high frequencies about 1 mhz. This is typically around 20v for power mosfets, but dont go higher than 1618v due to voltage spikes from the coil feedback. It is driving a 20uh inductor loosely coupled to a tesla coil secondary.