Here is why Gate-Drive Transformers are sometimes essential! | MOSFET Driver Part 2 (Potential-free)

28. 02. 2021
100 832 zhlédnutí

Do you want to know more about the Würth Elektronik components? Then click here: and visit the page to get an overview of gate drive transformers.
Würth Elektronik products, which were used in the video:
- WE-GDT Gate-Drive-Transformer:
- WE-GDTI Gate-Drive-Transformer:
- WE-AGDT Auxiliary Gate Drive Transformer:
Previous video:
DIY Tesla Coil video series:
MOSFET Driver Part 1 video:
Everything you need to know about Transformers video:
Support me for more videos:
In this video I will conclude the MOSFET Driver video series by having a closer look at Gate-Drive Transformers. As a practical example I will be using a Tesla Coil driver circuit that uses a Gate-Drive Transformer to control its MOSFETs. We will be finding out how the transformer works, how to use it in a circuit, how to create a DIY version and why using a commercial solution often makes more sense. Let's get started!
Websites which were shown (used) during the video:
Thanks to the Würth Elektronik eiSos Group for supporting this video.
2011 Lookalike by Bartlebeats
0:00 Presenting my new Tesla Coil
1:30 Why does it perform better than my old one?
2:42 Intro
3:03 Overview of what a Gate-Drive Transformer does
4:36 How does the practical Transformer work?
6:13 Having a look at the Waveforms
6:48 Complementary components for the Transformer
7:36 Creating a DIY Gate-Drive Transformer
8:03 Testing the DIY version
9:03 The problem with designing a DIY version
10:16 Getting a commercial Gate-Drive Transformer
11:05 Testing the commercial solution
11:30 Verdict

  • Do not breath the ozone (produced by the high voltage gas discharge)! It's a dangerous air pollutant, it may harm your lungs.

    Валентин СтойковВалентин СтойковPřed 6 dny
  • I'm getting a great education from your work on this channel.

    firstlastname99firstlastname99Před 11 dny
  • Sorry I didn't catch why the gate-drive transformer is used - Is it for any high frequency switching purposes? At what kind of frequencies would you start considering using this component?

    Even LundEven LundPřed 11 dny
  • I wonder: Could you avoid the core saturation by just reducing the drive voltage, then adding more secondary turns to boost the gate drive voltage back up again? I guess that would add more circuit complexity, to make a driver that’d run the transformer primary at a lower-than-system voltage, but I’m curious if that would fix the issue of core saturation, all else being equal?

    Dave EtchellsDave EtchellsPřed 11 dny
  • Scott, bootstrapping can be also done for a single MOSFET too. Refer, 0033mer's video on MOSFET bootstrapping.

    Patrick JosephPatrick JosephPřed 13 dny
  • Nice vid ! I was wondering, what is the coupling factor between the primary and secondary Tesla coil ? And what is the ressonance frequency of the secondary coil (taking into account the parasitic capacitance). If my memory is right you'll need to drive the coils at this frequency and have low coupling. That's how we got it to work at uni a while ago.

    Matthew Maxwell-BurtonMatthew Maxwell-BurtonPřed 20 dny
  • I heard the Ozon that is created as a by product using the Tesla coil can be quiet poisonous...

    StinktierchenStinktierchenPřed měsícem
  • You're awesome. That is all.

    MrPhuctMrPhuctPřed měsícem
  • Why don't use a p-channel mos instead n-channel used (the upper one)?

    drGremidrGremiPřed měsícem
  • Your videos are awesome! More condensed and educational than a college course! Thank you Great Scott!

    Train 2noplaceTrain 2noplacePřed měsícem
  • Man, you got to have a lot of highlighters laying around, when I use them for even a short time they become unsaturated real fast.

    genc saracaydingenc saracaydinPřed měsícem
  • What wasn't obvious why there wasn't as much of a saturation problem with the commercial GDT is that, it must use more turns with a thinner wire, and most importantly, theres a gap spacer in its core, which the toroid transformer clearly lacks. A submillimeter gap in the core prevents saturation, and in switch mode transformers (inverter PSU's, flybacks, electronic CFL / fluoro ballasts etc.) it helps the magnetic field to collapse as quickly as it can, releasing energy stored in the core. Very well made video, Thank You! Great channel! 👍

    750 kV750 kVPřed měsícem
  • Sir I have learnt soo many things from your videos can u make a video regarding Topic SMPS and Best Topology and Gate Drive IC for specific topology and designing its ferrite core its a request Thankyou ❤️

    Abdul MobeenAbdul MobeenPřed měsícem
  • Great job i tried to to find a circuit generate a alternatif current and change between 0 and 1 A du you have an idea to do thise circuit

    Leader AutomationLeader AutomationPřed měsícem
  • I think the reason is torroidal coil give higher voltage signal to drive the gates than the IC driver chip and the signal from Torroidal is closer a sine wave than the chip which is square wave. In the case of tesla coil sine wave is more useful than square wave.

    ຮຸ່ງ ພຸ່ງແຣງຮຸ່ງ ພຸ່ງແຣງPřed měsícem
  • Pass auf beim Spielen mit der Tesla Spule! Das Ozon, das dabei immer entsteht, ist ein ätzendes Gas, das sehr mit dem lebendem Gewebe reagiert. Ich kenne einen, der sich bei solchen Versuchen nachhaltig eigene Lungen verätzte. Nicht übertreiben!

    Valentin KuhfussValentin KuhfussPřed měsícem
  • Very nice, I hope, that at some point we will see it at full power. (230v)

    FirefoxFirefoxPřed měsícem
  • I have an engineering degree and still don't understand most of this on the fly :(

    Mobin92Mobin92Před měsícem
  • Why not use an optocoupler powered by a seperate power supply?

    Jugal MistryJugal MistryPřed měsícem
  • I enjoyed

    Paul KirchhofPaul KirchhofPřed měsícem
  • Hi, could you please make a video talking about the reactance (reactive power) needed to run a induction motor as generator (induction generator)? I would love to see your analysis of it's waveform, and how they can't produce their reactive power.

    Emanuel Gonçalves SantosEmanuel Gonçalves SantosPřed měsícem
    • I mean, what if we just provide enough capacitors to keep it running and rectify it's output?

      Emanuel Gonçalves SantosEmanuel Gonçalves SantosPřed měsícem
  • Someones a god

    Pheonix SPPheonix SPPřed měsícem
  • What would be the benefits of a steel core as opposed to a ferrite core?

    Bryant FryBryant FryPřed měsícem
  • Yay! The video I have been waiting for!

    ツElectric Dragon GGツElectric Dragon GGPřed měsícem
  • Wait, why you need freewheeling diode parallel to a mosfet ? They already have diode in the same direction

    XANiXANiPřed měsícem
  • 8:54 aaa, in this specific case I think it is not saturation that causes waveform to extinguish. It is just a capacitor in series on the input (CR high pass filter generally)

    ŁukaszzŁukaszzPřed měsícem
  • Nice video! Important also to mentioned! When GDT is concerned, we have to keep in mind the isolation material between windings! Between upper and lower winding potential difference is twice of the supply voltage. With ringing effect it is EVEN higher. For let's say 300V supply potential difference is quite high. It is needed to consider this aspect! Thanks for attention

    ŁukaszzŁukaszzPřed měsícem
  • Is it possible to make a transformer useing Headphones wire....

  • Bootstraps boot straps XD

    plageranplageranPřed měsícem
  • 10:32 woah woah woah, wait a minute... you've got a *purple* marker pen as well? :o

    jim40135jim40135Před měsícem
  • .....when you say 'galvanically isolated' I believe you mean 'electrically isolated' . I'm pretty sure that in english language the word 'galvanic' is used when talking about effects of dissimilar metals in contact and the resulted electrical activity that causes corrosion . It looks like you are using lead free solder. That stuff is a pain .

    Charles DickensCharles DickensPřed měsícem
  • .....okay, and in 2¼ minutes of video I've heard you pronounce the word 'series' as 'serious' . I was also making this mistake when I was eight years of age. Actually your English is very good . Thanks for your work .

    Charles DickensCharles DickensPřed měsícem
  • dead time between switching sometimes important

    czephei87czephei87Před měsícem
    • The transformer have natural dead time because the slow rising voltage on the secondary

      Muhammad HanifMuhammad HanifPřed měsícem
  • As always nice and informative video. One video request... Make it if possible (according to your convenience) How to measure current using shunt with OP-AMP with microcontroller.

    Vivek ChauhanVivek ChauhanPřed měsícem
  • As a self taught electronics engineer (embedded systems) this answered questions that I've wondered about for literal years. Thank you very much.

    DrunkenSwimmerDrunkenSwimmerPřed měsícem
  • Sir can u make time telling clock every hour useing pic ic or please reply me

    Ramesh BoinaRamesh BoinaPřed měsícem
  • I saw it well. The content structure, courses, and graphics are all nice. Learn a lot.

    TECH & DIYTECH & DIYPřed měsícem
  • full circuit diagram of your new driver? It is totally different

    AllroadrunnerAllroadrunnerPřed měsícem
  • Please tell me why you and electronoob upload at the same time

    Shubhkarman SandhuShubhkarman SandhuPřed měsícem
  • Every video I watch I wonder if someone is going to correct you on how to pronounce series. Not yet haha.

    LittleRainGamesLittleRainGamesPřed měsícem
  • Hello can you make a small variable 30v power supply please, it's for my individual project please, with schematic please.. love from Philippines ❤️❤️❤️

    aLvin87 ِ ِaLvin87 ِ ِPřed měsícem
  • HEY DUDE.. THIS IS URGENT.. PLEASE REPLY.. Can we make a transistor out of two diodes, just for very small current application?? If doping is the problem... Can we make a diode with highly doped P junction and weakly doped n junction, so that we can use it to make a transistor.... Is it possible?? You are the right person to answer this..

    Muhammed Aslam sMuhammed Aslam sPřed měsícem
  • Love the MOSFET series ♥️

    Aman SaxenaAman SaxenaPřed měsícem
  • Hello! How does a driver transformer handle dead-times needed in an H-bridge circuit with MOSFETs?

    Cesar PalaciosCesar PalaciosPřed měsícem
    • The slow rising time of the voltage will ensure the mosfet stays off until it reaches the threshold. So the transformer provide a natural dead time

      Muhammad HanifMuhammad HanifPřed měsícem
  • your videos are the bestt!!!👍👍👍

    Ioan CărămidaruIoan CărămidaruPřed měsícem
  • Very good

  • That works for a constant frequency AC load like a transformer driver but not for a low latency, DC load like a stepper motor driver.

    Lion McLionheadLion McLionheadPřed měsícem
  • I think OneTesla Kits are better, they generate huge arcs!

    PistonHead2kPistonHead2kPřed měsícem
  • D.C. Welders use same principal, a small voltage winding controls variable, welding current, called a "Saturable reactor", also High voltage, Arc Furnace, for steel Foundry's.

    Charleton ZimmermanCharleton ZimmermanPřed měsícem
  • Great, now I'm waiting for a video with more power on this tesla coil

    Vinícius Frias A LeiteVinícius Frias A LeitePřed měsícem
  • Please make videos on pic microcontrollers and software i2c

    Vidul AbeywickramaVidul AbeywickramaPřed měsícem
  • interesting

    Skillful ManSkillful ManPřed měsícem
  • I'm skilled and qualified, says me, is that good enough? Can I still continue to put housekeys into wall sockets? Theey just fit so perfect, I cant help myself. Sometimes when I collect MOTs they are really dirty so I bathe them in soapy water outside. To get the water warm, you can plug the MOTs in and leave em in the water for a bit. Once I forgot to unplug them and WOW, about blew my dick clean thru my balls n out my ass. That reminds me of a certain plasma tube, tesla coil, and a hooker. Lets just say I saved a couple grand that night and now the proud owner of a Gazeebo.

    Kasper AbigailKasper AbigailPřed měsícem
  • For those who like Digikey or Mouser for purchasing parts online, note that the "Pulse Transformer" section is where you'll find these sorts of gate drive transformers in the catalogs, including some from the sponsor Würth Elektronik. :-)

    rougenaxelarougenaxelaPřed měsícem

    AlacritousAlacritousPřed měsícem
  • Great video as always

    ron vaizmanron vaizmanPřed měsícem
  • Hogy te mekkora egy szerencsétlen vagy XD... Komoly villamosmérnök azt nem tudsz megépíteni egy normális Teslát. Orosz kisgyerekek jobbat építenek nálad... Azt te vagy itt az okos XD... Remélem nem tudsz magyarul, mert akkor még kiderülne számodra mekkora balfék vagy.

    Anasztázia ApátiAnasztázia ApátiPřed měsícem
  • Wow man, thank you. You really taught me something.

    Corne van ZylCorne van ZylPřed měsícem
  • Very confused, why is the performance of the new tesla coil so poor, has it not been tuned properly? I've generated much larger arcs just using an old TV flyback transformer with a ZVS driver. Based on the size of your coil I would expect arcs of over 150mm, not 25mm. Might want to test the resonant frequency of the primary and secondary coils to make sure they match and are being driven at this frequency.

    flomojo2uflomojo2uPřed měsícem
    • I was using 25V AC max. That is why.

      GreatScott!GreatScott!Před měsícem
  • You know his youtube cash rolled in when he is printing with colour.

    VabloVabloPřed měsícem
  • Brother you deserve more views and subs,salute for u ,u doing a great job by sharing knowledge of electronics. I am also electronics and electrical engineer, still studying though,but I am very fasinated in the field of electronics. Learned Soo much basic things from u and electrboom ,plasma channel.👏👏👏great job keep going

    Sriraj PoojarySriraj PoojaryPřed měsícem
  • or use cheap mosfet driver IC like FAN7382

    Browarus PierogusBrowarus PierogusPřed měsícem
  • Solid video.

    PicoNanoPicoNanoPřed měsícem
  • Just Curious if the same would be true for IGBT? I would assume IGBT are built for driving inductive loads more efficiently?

    D ZeeD ZeePřed měsícem
  • Are you sure it's saturation? The curve seems pretty linear, so it looks like the rate of change of the field drops because the current through the transformer stabilizes. Transformers do not pass DC, and the closer you get to DC, the worse they perform. You will need insanely high inductance values for low frequency transformers (look at the old wall adapters designed for 50/60Hz, and they're sinusoidal). Also wondering what current is running through the transformer. When the gate is charging it can be huge, but for a very short time. If the transformer can't supply this current, the gate charges slowly.

    Gurux13Gurux13Před měsícem
  • I have watched many of your videos, which btw, I enjoy how you break down the electronics into something easy to understand (even though you aren't a native english speaker, I can understand you very well). A few questions have come to mind: 1) How long does it take you to draw all those schematics? You are very meticulous in the drawing. Is the one for the video much neater than the original? 2) With your drawings, how come you go over the lines multiple times when the first mark is quite visible? You use very good lighting, nice white paper with a very dark marker. 3) I've forgotten what my other question was. Will have to post it later when I remember it 😜

    KorishanKorishanPřed měsícem
  • Can you make a video about how to select those component values? Interested to make my own Tesla Coil

    Itamar CohenItamar CohenPřed měsícem
  • I always know i am going to progress a lot in electronics when the Great Scott notifications come up . You are like purity of knowledge and a great teacher . Thankyou !👍🏻🙏

    Electron Proton Neutron MouronElectron Proton Neutron MouronPřed měsícem
  • Fantastic! Thank you very mutch for sharing!!

    Antonio Barbosa de JesusAntonio Barbosa de JesusPřed měsícem
  • Your very amazing sir

    Javier's DIYJavier's DIYPřed měsícem
  • Your videos are awesome! You inspired me, with your LED cubes videos 6 years ago to start learning about electronics, and now, I am 3 years into my EE degree and I love every bit of it! Keep up the great work man, and stay safe!

    Av3570Av3570Před měsícem
    • Great story mate😁 Keep going👍

      GreatScott!GreatScott!Před měsícem
  • this is a comment so youtube knows.

    Kevin BissingerKevin BissingerPřed měsícem
  • An audio tip for you: To reduce the breathing sound between your sentences, use a noise gate (or expander) before your compressor. Your videos are awesome, keep it up.

    Micai AskaussMicai AskaussPřed měsícem
  • Use caution when running a Tesla coil or Van de Graaff generator in your lab. They have enough voltage and energy to blow out all sorts of expensive test equipment even without being connect to them. Had a guy bring a VdG into our lab one day and managed to wipe out two HP scopes and a CRT terminal. The VdG was not even on the same bench. When he fired it up corona sparks were jumping all over the place from one metal bench to the next killing the equipment. Those things make a wicked E field.

    Craig SCraig SPřed měsícem
  • Howdy. How about using a P-Channel Mosfet as the upper one ? Regards.

    Eugene PohjolaEugene PohjolaPřed měsícem
    • They are not available in as low of "on resistance" as the N channel. Also, this does not eliminate the need for the transformer in an H bridge circuit.

      glasslingerglasslingerPřed měsícem
  • 👏👏

  • 0:48 Says "..what I can do best: Soldering components" - then produces horrible joints..

    salatsalatPřed měsícem
    • I'm sure it was for the comedic effect, since he has done rest of them himself too. But I had to rewind the first time to admire these balls.

      Sebastian GrygielSebastian GrygielPřed měsícem
  • Was waiting for this video to release. Very good explanation. I have a question though. Does the negative voltage generated by the transformer not damage the MOSFET?

    Celebrimbor101Celebrimbor101Před měsícem
    • No

      GreatScott!GreatScott!Před měsícem
  • Thanks bro. Good explanation!

    James JohnJames JohnPřed měsícem
  • I am starting to understand inductors and transformers thanks to your videos on the subjects. It would be interesting to know why the tesla coil produce higher voltage with the transformer. Is it because of a hard start and hard stop, because of the spikes on each edge? Or is it because or slightly overlapped on/off for both transistors from faster turn on? Does the improved circuit consume more current when given the same power supply voltage?

    Christian GingrasChristian GingrasPřed měsícem
  • Could you do a video on this kind of circuit: It seems like it performs really well comparatively, and is very simple. Might be fun to look into!

    Dave with DellDave with DellPřed měsícem
  • Coils are complex because of the lack of info about the ferrite

    aldo baldo bPřed měsícem
  • all your video are best i enjoy each and every moment .. i see like this 👁 👁 👃 👄

    Gorkha EngineeringGorkha EngineeringPřed měsícem
  • Me saludas? Porfis? Soy de Argentina y amo tu contenido

    William JaqueWilliam JaquePřed měsícem
  • Thank you for this video But hey Scott can you explain what is boost trapping.... in briefly..

    • Watch Part 1.

      GreatScott!GreatScott!Před měsícem
  • Wow!

  • Thank you. I am looking to design a cuk converter rather soon, and the subject of integrated magnetics is kind of voodoo. There's electrical engineering, then there is magnetic engineering, and then there is the continual play against math and market available components or subcomponents to work with.

    Aim54DeltaAim54DeltaPřed měsícem
  • As always a well researched and informative video. I wish I could hand draw circuits as neatly as you

    Spark GapSpark GapPřed měsícem
  • Are base drive transformers for BJTs different to gate drive transformers or are they the same?

    David WangDavid WangPřed měsícem
  • A Dixon Multiplier can also be employed to drive/store a charge of Source + 12V, then drained to the gate through an optocoupler.

    GnuReligionGnuReligionPřed měsícem
  • seems like a small arc for the coil size

    Leggo MuhEggoLeggo MuhEggoPřed měsícem
    • It is not turned up to full input voltage, which is about 140 volts. I don't know why he didn't turn it up to show what that coil can really do!

      glasslingerglasslingerPřed měsícem
  • Another video to watch tomorrown

    Ben MitchellBen MitchellPřed měsícem
  • Looking forward to going whole hog on my own SSTC as I move up from Slayer Exciter variants to more complex systems. Your tutorials and how-to videos are golden for this. Many thanks from Australia! :D

    Geordie MatthewsGeordie MatthewsPřed měsícem
  • Hey there Great, I think your home-brew tesla coil may be suffering from having that corrugated hat. The peaks of the ridges become regions of high charge concentration, hence high voltage, and thus leak charge to the atmosphere disproportionately compared to the average voltage, this limiting the overall voltage the apparatus can achieve. That's the motivation to have a smooth dome/hat.

    Graham WidemanGraham WidemanPřed měsícem
  • Adam adam

    Mimi MiMimi MiPřed měsícem
  • The video came just in time. I'm too building half bridge sstc, thanks

    Lama TatranskaLama TatranskaPřed měsícem
  • Finnaly which is the beter? Gate driver transformer Or gate driver ic?? And can the gate driver transformer work at 100% duty well?

    hossein yhossein yPřed měsícem
  • I would say you are better at teaching than soldering ...

    Dani CarbonellDani CarbonellPřed měsícem
  • Very cool and informative video, but you could've said that a tesla coil normally runs on 100kHz to 2MHz so the saturation of the core wouldn't matter in such a high frequency.

    Yanik B.Yanik B.Před měsícem
  • From my experience, green toroids make the best GDT cores. And they're really cheap if you get them from China.

    Bogdan SerbanBogdan SerbanPřed měsícem