Tesla-Coil Beginner DIY Tutorial: GDT - Gate Drive Transformer
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- čas přidán 3. 07. 2024
- This Video is about the GDT.
One of the most important parts of a Teslacoil (SSTC, DRSSTC)
#DIYTeslacoil #GDT #Teslatutorial
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Amazing video and very informative! as usual
Just a tip: In fact, for better coupling / lower inductance leakage, the primary must necessarily be twisted with the secondaries, to be even better, an individual primary twisted with each secondary
This is the guide I wish I had when I was building my SSTC, great work! I love your solution for twisting the wires together, that's a pretty creative way to use a drill.
@Joseph Bunn On it's way. College is keeping me busy though. I'll hopefully get most of it done tomorrow, but then I'll still be waiting on my collaborators (we plan on releasing videos at the same time). I'm hoping it will be done before October! But...you know how plans go!
@@aboredperson2920 you didnt even edit your message...?
Thank you for this video! I would say GDTs are not so much about separating HV from LV, but turning on and off n-channel transistors, which work in common drain config. To be precise, to fully open upper switch of H bridge, you have to put the voltage between Gate and Source (or Emitter), but upper switch Source is connected to load, so gate drive signal can't have common ground with supply voltage. Unfortunately, with GDT you can't have duty cycle other than 50% (transformers only work with AC), so switching power supply - ok, induction heater - ok, SSTC - ok, but DC motor, where you need PWM - not ok. But that's just a fun fact about GDTs.
Very well said Sir..how can I connect with you
Optimally you also want all the windings on the gdt to be twisted together for optimum coupling and performance, and ideally you also want the primary wire gauge to be the sum of all the secondaries combined as it will have 1-4 times the current on it depending on if you're driving a single fet or a fullbridge. You want the primary to be the sum of all the secondaries combined to minimize resistive losses.
I usually use ethernet cable that i take the twisted pairs out of, then i twist all the twisted pairs together, then i join all the white wires into one as the primary and use four colored wires as the secondaries. The galvanic isolation you get with a gdt is pointless anyways as you always need to connect the low voltage logic section to the same ground as the high voltage section either way, otherwise you end up with other issues.
However it is always better to use a dedicated gate driver IC as that completely eliminates the issues you always get with a gdt no matter what you do. I usually use an optoisolated one, but you can also use a IR2010/2110 etc.
The only reason the gdt even exists is that it is often cheaper than a full gate drive circuit, (and was the only real alternative before direct/high side gate drive ic's were invented) but it will never perform as good as a real modern gate drive ic. A real gate drive ic can supply in some cases several Tens of amps to charge/discharge the gates, to achieve the same currents with a gdt, the core will end up huge due to the wire gauge needed for these currents to minimize losses/leakage inductance, not to mention the gdt driver will have to be capable of supplying like 4 times this current, at which point you need a bridge as powerful as your main bridge just to drive the gates.
In the biggest DRSSTC's built to date, just the gate drive circuitry alone is several KiloWatts(maybe even as much as half the power the coil draws from the wall at full power) to drive those CM300/600 IGBT bricks efficiently, given they were never really designed for much more than the higher end of the audio range in intended operation.
Very well explained. Thanks 😊
Thanks so much for the great learnings👍🏻
Thank you 🎉
I really need to pull my finger out and build a SSTC. Thanks champ!
Dude! I have great admiration in watching all your videos as you are very talent in what you do. You are the best teacher in Tesla coils. Keep it up dear.
Thank you so much, really appreciate that!!
Awesome ❤️❤️❤️
Finally a instruction video Not in german, thanks
Cool video, thanks :)
Can't wait. Really hope you make more English videos. My German is on toddler level 😅
I will keep on producing english videos ;)
Nice video nice explanation
Thanks!
Thank you bro
Nice, simple tutorial on gdt
I’m still new, so forgive this question if it’s totally moronic…
You describe this a GDT to step up from 12v to 36v(or whatever)). If the primary winding is on the left with the secondary on the right, why are the MOSFETS located in the secondary circuit.? If I missed a key point, my apologies.
All of your videos are excellent.! Thanks for taking the time to share your knowledge.
@@TheElectronicDilettante yes you did missed a key point. the GDS's are used not only for galvanic isolation but they are essential to drive the high side MOSFET's without mains voltage comming to the gate driver ic becouse high side MOSFETS's require higher voltage at the gate pin than it has on source pin. For example if you have 170v on high side MOSFET source you have to apply 188V at the gate if using the gate driver ic directly connected to MOSFET to get the required gate to source voltage, on the other hand if using the gdt you directly apply the 18v across the gate and source thus you don't need to mess with those high voltages going to your driver. Also he used the GDT to step the voltage up from 12V to 18V with 8 : 12 ratio and the GDT(Gate Drive Transformer) is only used to drive the gates of the transistors. Hope that helps😉
Thanks for uploading in english.
Cool
Nice stuff!
I generally prefer using isolated drivers with a supply generated by using a three windings transformer, with the primary driven by another non isolated inverting gate driver (or with a not gate / inverting Schmitt trigger) in a relaxation oscillator configuration. Works very reliably and provides a very nice gate and low impedance waveform. Using GaN is also nice (but pricey failures :O )
Really helpful
Glad to hear that!
I like your Tesla coil gun
Best
Great, but how to identify dot of each secondary winding?
Danke für diese äußerst wertvollen Videos!
Ich glaube fast dass du der einzige bist, der das so perfekt in nem Video veranschaulicht!
Ich hoffe das zahlt sich für dich mehr als nur durch positives Feedback aus :)
Vielen dank für deine netten Worte!!!
Excellent video, very informative as always !! I had to learn the hard way -Trial & Error! Many hours looking at data sheets 😅 got there in the end - now have a scope 10 yrs too late - but from a perfect Sq-Wave you can see the losses on the output 3E10-12 is bad from low freq 400 ………. Will have to try N87 - Q… why do you keep your signal wires separate? 🤔🙏🙏👍Andy
Finally I know why in schematics there are always 8 turns! Can you make video about another Tesla Coil transformer - feedback transformer? That would be another awesome educative video.
I will think about it ;)
@@Teslaundmehr would be amazing, pls super do it! 🥺👉🏻👈🏻💗
i used 25 turns on mine, just for a range of about 10 to 100khz on my igbt driver (have yet to actually use it for driving hv ferrite transformers) but waveform seems to look good at higher frequency, just a little weird "sine wave" waveform at the top, but i think that's okay. N87 core though.
Great video, Any chance you could do a more extensive video on adding DEAD TIME to the gate drive??
can u please do a video on a turned on tesla coil and use frequencies to lift, burn, make invisible any item?
It was really fun..but I was hoping some maths will come in eventually. Could you please provide some references from where I can study and build one for myself
how did you arrive at 8 turns for primary
hi friends. your tutorial video really hypnotized me, so I didn't get bored watching it. for the manufacture of gdt, what kind of core should be used? and if it is wrapped with 1 loop of cable and measured with an esr meter it shows what value uH for one winding?
What about ringing effect vs frequency. Adding protective diodes and schotkey to save Gate of mosfet or igbt?
Does the direction of the two winding make a difference?
Can i cover the wires with super glue or electronic varnish so they won't move and stay put? Or would this affect the way ferrite works chemically?
Where can i find more info on what size core should i pick?
Can I use e shape ferrite core
Of course one should remember about the insulation thickness. This insulation should withstand the voltage between transistors.
BTW You are very handsome and it is hard to focus on the topic 🙈🌈
Oh thank you!!!😊😊🤗
Xiexie
Gamsa hamnidar
Arigato
Terima kasih
Thank you
Danke
Spasiba
Hey where did you find the chart at 1:57
what is the primary inductance ?
Well done. Do you think it will work with switching series MOSFETs simultaneously?
👍👍👍
I guess a half bridge is like 2 mosfets in series, so I guess it will work. But what will the impulses on the secondary do with the primary winding circuit? 🤔
@@MasterIvo in half bridge the 2 couple of wires going to mosfets are in opposite phase, if you want the same signal in phase to control 2 mosfets you have just to use same phase (gdt wires) for each gates
@@GianniLaschi yes I understand. But I work with high voltage impulses on the source and wonder if they will feedback to the primary
Can you tell me if playing the tesla coil is infertile?
Thank !!
There Is a second transformer in my drsstc circuit diagram labeled BAX EE28 5x5x150
I have no idea what kind of transformer is that, can you help?
What about the material for frequencies of 30-80khz 🤔🤔
Your twisted wires have a greater length [amount of copper per winding] than the single black wire.
But, as a result of being twisted, less turns around the core than the black wire.
Gdt or have very name dont work because in secondary side need circuit control voltage and correct its pwm shape.when in primary duty sycle decrement voltage in secondary decrease and go 12 v and pulses dont have proper shape.
Plz make a tesla coil powered direct by only zvs step by step
@Joseph Bunn plz i want step by step vedio because i change capacitor to 100nf but mosfet blew up i already destroy my 3 zvs from ebay
@Joseph Bunn did you have made it
Hi Leon! Where do you get your ferrite cores from?
Hey, from a german seller called Reichelt Elektronik, but you can also buy it good from Mouser, digkey etc
@@Teslaundmehr That's actually great! Greetings from Austria! Thanks!
Ich wurde infiziert und bin momentan dabei meine erste SSTC zu bauen habe bereits eine funktionierenden Treiber, und die Resonanzfrequenz bereits ermitteln können. Nun ist es soweit einen GDT(übertrager) zu wickeln ich bin mir ziemlich sicher den richtigen N87 Ferritkern bestellt zu haben nur leider beim Draht bin ich mir nicht so sicher.
Ist das im Video eine Schaltlitze 0,25 mm², Kupfer verzinnt oder was würde der Profi empfehlen um einen Übertrager im 100 Khz bereich zu wickeln?
Mit Freundlichen Grüßen Steffen :-)
Moin Steffen,
Das freut mich!! Der Draht bzw. das Kabel ist sehr unkritisch. 0,25er schaltlitze ist gut geeignet ;)
@@Teslaundmehr super da bin ich schonmal beruhigt. Super danke für die schnelle Antwort und mach weiter so !
That is one GIGANTIC drive transformer. Also how can I tell what material I have. ...I have a lot of recovered cored from dead PSUs.
If you know proper way make a transformer for two output of switching ic and streghthen it for trigger 20 mosfet.i thanks alot from you .but work must work properly in 2 percent duty cycle to48 and voltage dont go below or abow 12v
from vietnam with love
i can't find ucc37322 hic :
@Joseph Bunn ths u
@Joseph Bunn how will interrupt be connected
@Joseph Bunn ths bro
I used a TC4423 in my UD1.3 driver. It works just fine.
@@ceepopi If you use the UCCXXXXX series then you can directly connect the interrupter output to the enable pins of the gate drive IC.