SSTC pt. 10 - Gate drivers

[@TechGorilla1987]

My wife was not a fan of me watching your videos while I was in the room with her. I seriously asked her why (since she loves the cat) and her answer was interesting. At first she thought you were badly trying to imitate a dialect, then she though you were trying hard to learn English, then she came clean - it's because she cannot 'trill' her r's like you and Bigclivedotcom can. I caught her in the car (and out of the blue) saying "Here is my cat of courrrrrse" Which made me snort coffee out my nose.

[@oji2691]

🤣🤣🤣

[@alberti.2334]

😂😂😂😂😂😂

[@uK8cvPAq]

Dump her.

[@pu5epx]

Dôdgyyyyyy

[@tetraederzufrequenztesla2342]

Very nice oscilloscope is totally classic classic. I have fall in love to him. Great Apparat. Thank you for updating us. It's a pleasure to me listen and watch your videos.

[@edgeeffect]

Dave Jones says that owning an old analogue CRT scope is a great tool for LEARNING electronics as well as a good piece of test gear..... and we all know that ex-Soviet stuff is "just the coolest".... so both in one is perfection.

[@Overclocked2300]

Thank you for the video. Having the oscilloscope handy to show the differences between the two circuits was a nice touch and helped me out a lot!

[@edgeeffect]

This is the most useful KZbin series since "The Post Apocalyptic Inventor" built a discrete linear regulator.... I will probably never make a SSTC but I'm learning LOADS of useful theory watching this.

[@edgeeffect]

@Heads Mess No YoU aReN't . SeRiOuSlY. uNlEsS iNcOrReCt InFoRmAtIoN iS uSeFuL. :P

[@mohalothman99]

Bloody hell! That moment when you will plug the circuit in the main would be terrifying for me! hope nothing blow up

[@dk6ii]

I like your videos much! Electronics correctly explained. I suggest them to my students. If you don't mind, I'd use some of your gate driver measurements in my lectures. Thanks in advance

[@coloradowilderness3139]

Your analysis is very informative. I always learn from you. Thanks

[@Magneticitist]

That's quite an improvement

[@omaribrahim5008]

when you plug it directly to main voltage it hard to make it and you know any erorr will make everything blow up

[@R4MP4G3RXD]

That's the fun part :D

[@Miata822]

I must be learning something. I actually thought through the current amplifying circuit before watching this video as a way to limit the Miller effect. your lessons are working!

[@DIYwithBatteries]

Awesome circuit Sir 🤓👍 .

[@kolinevans9127]

Thanks for sharing, great video the slow on fast off looks like a great driver amplifier.

[@sfp4197]

Why you don't use a simple gate driver I just wait for the mains pulging

[@kolinevans9127]

Heads Mess hey thank this is all valuable and valid feedback, I’m not against heat because it’s winter here, but I thought the slow on fast off was a good design for other applications also.

[@kolinevans9127]

Heads Mess heat is the friction of life , the poetic dance of inertia. Sometimes we want to avoid heat sometimes we want things to burn with that friction. I’ll take what you outlined into account thanks for sharing.

[@kolinevans9127]

Heads Mess oh shit, I just realized, you’re the Cat? ! How did you type this ?!?! It all makes sense now....

[@gordonwelcher9598]

You have the cutest cat. Please show more.

[@WolfgangMahringer]

Great content! I used the two-transistor gate driving circuit too to drive a MOSFET faster, it works great! You should use a faster oscilloscope though to measure rise and fall times that short...the C1-118A is only 20MHz BW (had to look it up).

[@tvdylan]

THATS FAST !! ❤ YOU GENIUS!!

[@Debraj1978]

"IR2153" is an interesting driver, which does not specify the pulsed current output rating (in Amps). For example, "IR2110" has IO +/- is 2A, but "IR2153" does not specify any such value on data sheet. May be "IR2153" has low current drive rating and that may be the reason to add additional push-pull circuit?

[@DiodeGoneWild]

there's multiple different datasheets of IR2153. Some don't say the output current, some say that it sinks 400mA and sources 200mA.

[@supersilve]

We usually use also a small electrolytic capacitor like 22uf in parallel with the small ceramic onror to help out with the charging current to the gate

[@joegrow9998]

Great videos!! THANK YOU SO MUCH!! was wondering if I'm using a pulse transformer to control the gate, is it posable to still use a transistor to amplify the gate current? wouldn't doing this cancel out the isolation between the circuit? I think using the GDT was a mistake anyway! STILL WONT WORK!! Thanks in advance have a great day

[@electronic7979]

Very good 👏👏👏

[@oniruddhoalam2039]

Diode, can you make a video about class C amplifiers?

[@LMB222]

Class D !

[@gacherumburu9958]

Thanks for the info..👍👍👍

[@noakeswalker]

The gate drivers need to be able to supply amps - do you have a feel for the size of current pulse into the IGBT gates with the gate driver transistors in place ? Just curious - it seems amazing that gate current could be so high, even though it's only a burst of course...:o)

[@LaboussoleNano]

Hello, thanks for your video, I am beginner in power electronics. I want to do a pushpull with output current around 10A which bjts can I use?

[@richardnanis]

Thanks for the interesting update. It could be seen already in your last video about your SSTC but now its even clearer. I am working on a royer converter for an induction heater and have problems with good switching edges on the gates. I use power mosfets IRFP4768 (getting the real ones soon - after failure with counterfeits from ebay). I guess the edges got worse and worse with the load because the fake mosfets had much higher Rdson - meaning the other mosfet couldn't be drawn to zero by the fast diode and with the voltage drop over the diode and the bad conductance of the other switched-on mosfet, the gate of the stopped mosfet was in the threshold voltage and lost a lot of power. I wonder if this totempole amplifying circuit to improve to gate drive will help here too - as it is directly coupled with the main resonant tank circuit - what do you think?

[@supersilve]

If you have fake mosfets it will also have lower gate capacitance, adding a current amplifier will not help in your circumstance because you already got enough to charge the low gate capacity.

[@richardnanis]

@Heads Mess Thanks for the information! The circuit i am using is here: kaizerpowerelectronics.dk/wp-content/gallery/2013_01_17_-_royer_induction_heater/royerIH.gif The gates are driven by the feedback of the tank circuit via the fast diodes which draw the gates to zero when the opposite mosfet is conductive. If the Rdson is too high, it wouldn't be able to draw them to zero at high loads, so adding the voltage drop of the Si-diode there might be too much gate voltage still to totally shut the mosfet down. I measured the gate signal on different loads and it gets worse and worse. I am pretty sure i got fake IRPF4768 - thats probably the main issue. When i put the amplifier circuit (totempole config.) before the gates it might work better - still not sure if it disturbs the resonance circuitry? A schottky diode instead of the fast Si-diodes would also improve the situation - but you dont find a fast schottky for 500...600 V and some high current in the 10th A region. I drive the resonance at around 40 kHz only and have these problems - but no ringing so far. If you reduce the gate resistors you get faster on-edges (no fast off-edges) but put more load on the zener-diodes.

[@richardnanis]

@@supersilve Yes, they have 50% lower gate capacity and they are fake. It seems the problem is not the current to charge or discharge the gate capacitors but the voltage level, esp. on the off-edge. Will see how the real mosfets work...

[@supersilve]

@@richardnanis Yes that is all true but that is how hard you switch the gates, more current more fast rise time and less fall time,, the edges get sharper accordingly. The only thing left will be the time of switch on/off of the component itself that you can never change.

[@hashmark07]

Hi. Isn't the base resistor 15 ohm too low for BD139 and BD140? The base current should not be higher than 0.5A.

[@supersilve]

The maximum current from an IR2153 is around 180mA source and 200mA sink. This is more than enough to drive BD139/40 considering the HFE in these transistors. The base resistor could also be 47R which will still give enough current gain. This I tried myself driving a GDT and getting more than 1A at the output.

[@DiodeGoneWild]

well, the 15 ohm resistor could be higher. I just left it in place because it was previously driving the gates directly :). I may lated change it to 33 ohms. But anyway, the IR2153 can't sink more than 400mA and source more than 200mA anyway.

[@supersilve]

@@DiodeGoneWild Well to be fair the source and sink currents are not specified in the datasheet for the IR2153 while its counterparts the IR2151 will source 100mA and sink 210mA and the IR2155 will source 210mA and sink 420mA I guess the source and sink currents for the IR2153 must be somewhere in between. With these currents there will be enough to drive the current amplifier for the IGBTs for sure. Keep up your good work and thanks for sharing your experiences with us.

[@stephanc7192]

Great video

[@ardhi1269]

Better and easy way, you can try using mosfet driver ic, its also can work with igbt

[@electrochem8819]

Can you please elaborate us the history of screw, where they made? When they made? Who invented them? What is the function of the screw? What's the lesson in life using screw? What is the future for the screw? I really need it.

[@basviel6288]

Don't screw yourself ...

[@BIBIwood]

I saw that Patreon is supposed to offers Euros soon, do you think you will make the switch or will you stay in US dollars ? It's the main reason stopping me from supporting my favorite channels as it incurs fees from my bank every month. Especially since you have to do the conversion the other way around I guess.

[@DiodeGoneWild]

Not sure, I think that some people may prefer dollars, some people euros. I also don't know how to switch the Patreon to euros, as I already have patrons there that use dollars. I'm actually converting it to CZK to spend it in my country, we don't have euros.

[@devilvortex1]

the igbt driver from the welding machine was not good?

[@makoveliprod]

Hmm, it is possible to use current amplifier at ss8550 in self-oscillating flyback to reduce turn-off losses? I have not seen anyone use similar solutions in self-oscillating flyback.

[@TheMoibent]

I have a quick question , why there is no voltage in the output of my gate driver if I have 12v in the input ? I connected it all correctly according to the datasheet and Im measuring it on a multimeter

[@deejayobenn160]

What's the capacitive load of ir2110?

[@marcogeri]

Hello, good job. Do you really need to speed up also the turn on? What about the diode recovery time? You could have bad issues when turning on too fast. A local turn off pnp is not enough to reduce switching losses ? I have used PBSS4032PT and PBSS4032NT from NXP for this task and they are simply excellent. Very fast and very high hfe at high peak current. Maybe are not needed for your low Qg igbts but worth to give a try if you plan to use higher Qg power switches. Great job as usual.

[@robson6285]

Speed up the turn on is not to make it earlier but to shorten the switchingtime so the component (mosfet or igbt) is less time in the state between on&off so less powerlosses that heat up the fet or igbt.

[@marcogeri]

@@robson6285 yes but what about the recovery time of the other ibgt parallel diode when you are turning on? Switching on too fast is usually not a very good idea, especially in high voltage designs....

[@drobotk]

The best way to end the day :)

[@dl8cy]

awesome work! úžasná práce! Tolle Arbeit!

[@JusstyteN]

Thanks, usefull info

[@krypton1886]

Нифига себе, советский осцилограф!

[@station240]

Just don't short the output on the transistors (to ground or anything else), they overheat and blow up. There is no current limiting in these circuits.

[@ourchannel8215]

how to driver 2 mosfet in push-pull with uc3843??

[@electrochem8819]

Would show and explain us piece by piece all parts and components you'll be using?

[@edgeeffect]

Watch parts 1-9 ?????

[@roentgen226]

Thank you so much

[@hansmaier3689]

18V Zener Diode add additional capacitance that has to be charged and Discharged

[@cezarcatalin1406]

With enough current, everything is possible.

[@johnavonvincentius1884]

Actually,will that gate driving circuitry work with a GDT?

[@supersilve]

Yes it does

[@alirezaeskandari2287]

could you use a schmitt trigger to flip a signal comming from an antenna and then tru a resistor or capacitor or both feed it into the chip for feed back? and how it works is like this : there will be a capacitor on the chip oscillator pin and the chip will start oscillating but the antana will receive the exact self resonance wave form from the secondary coil and then the signal will get fliped and then feeds in to the capacitor pin of the chip so in that way the coil will run at its resonance frequency

[@Magneticitist]

You could but I think he avoids it to keep the circuit minimal. Steve Wards Micro SSTC uses the antenna feedback to drive a gate driver directly so the inverter isn't even necessary sometimes.

[@alirezaeskandari2287]

@@Magneticitist yes i have seen it but as you know with the ir2153 when the timing capacitor voltage is rising the low side output is high this circuit is super simple and works

[@Magneticitist]

@@alirezaeskandari2287 Maybe a good CT would be even easier.

[@alirezaeskandari2287]

@@Magneticitist yes that would be much easier im very interested in electronics but i dont have money to buy even a cheap multimeter but i have made a single switch tesla coil with 10-15 cm long arcs

[@Magneticitist]

@@alirezaeskandari2287 10-15cm sparks is more than a great start. Buying instruments and components isn't easy on a budget but these days they have some pretty affordable stuff available to where a person can sort of take steps instead of saving up a lot of money to get the expensive stuff. I think a $5 voltmeter is fine alongside maybe a $20 LCR meter. Something like a DSO138 scope can be handy at moderate frequencies, I used one of those for a while. I've seen those go for like $10 on ebay. $5 400khz signal generator modules are pretty nifty too. You probably know all that but just think about how expensive it must have been years back before all these cheap entry level instruments were available.

[@saschakolb7102]

I think you're even qualified to work on a flying sausage, - hmm a flying saucer I wanted to write 😘👍😅 Great video

[@Conservator.]

Tx, very interesting and informative as usual. Could you also you MOSFETs as drivers and what would be the advantages/disadvantages compared to BJT’s?

[@Conservator.]

I found this but don’t quite understand it. Totem pole stage with N-Channel and P-Channel MOSFETs can be used to boost the output from an IC Driver. The disadvantage is that the signal is inverted and also there exists shoot through when common gate voltage is in transition. Totem pole arrangement using matched NPN-PNP transistors, on the other hand, offer many advantages, while boosting the output currents from IC Drivers. Shoot through phenomenon is absent in this case. The pair of transistors protects each other’s base-emitter junctions and handle current surges quite well.

[@robson6285]

@@Conservator. whats not clear about that? It is a clear answer to the question, so i wonder how and where you found it when not understanding the jargon or I wonder because if there is a way to find such nice&good&complete answers for such electronics questions that would be great for me and many, so i think

[@Conservator.]

Rob Son Hi, I google using this: driving igbts with transistors or mosfets And this document was the second item: www.ixys.com/Documents/AppNotes/IXAN0010.pdf

[@Conservator.]

Rob Son What I don’t understand is why there would be shoot through when using MOSFETs and not when using ‘matched NPN-PNP transistors’. And why will the signal be inverted using MOSFETs and not with bjt’s. I didn’t read the hole document to be honest. I first posted the question and later added the explanation from the document. Maybe I should read (=study) the document first.

[@tonyshi3688]

@@Conservator. Inverting: With mosfets, you have a pmos on top and an nmos on the bottom. When the driver output is high, the nmos turns on and the pmos turns off (the threshold voltage, Vgs(th), for n channel mosfets is positive and for p channel mosfets, negative.). This connects the output to ground. Likewise, when the driver output is low, the nmos turns off and the pmos turns on, connecting the output to the positive supply. Thus, the output is inverted. Shoot through: Suppose the supply voltage is 12v. 12v is standard for mosfets, 15v for IGBTs. Because the driver cannot instantly change the voltage on the mosfet gates, with the gate capacitances and parasitic inductances, there will be some time when the voltage is high enough to turn the bottom mosfet on and low enough to turn the top mosfet on. From around 5v to supply-5v (5-7v here), both mosfets are fully conducting. Since the two fets are the only thing between the positive supply and ground, there is a relatively large amount of current that shorts through the mosfets. This is shoot through. The benefit of mosfets is that they can provide rail to rail outputs, since the have internal resistance instead of voltage drop. The gates are also isolated, so less current is needed to control the mosfets. With bjts, there would be an npn on top and a pnp on the bottom. The npn conducts when the voltage between the base and the emitter is above some 0.7 v or so, proportional to the amount of current flowing from the base to the emitter. The pnp conducts when the voltage between the base and the emitter is less than around -0.7v, proportional to the amount of current flowing from the emitter to the base. Since both bases are tied together (without biasing diodes or resistors), it is "impossible" to turn both transistors on since the base voltage would have to be both higher than the emitter voltage by ~0.7v and lower than the emitter by ~0.7v. (The emitters of the transistors are tied together and to the output of the driver.) Also, since the top transistor turns on when input is high and the bottom transistor turns on when the input is low (high and low are relative to the voltage on the output), the signal is not inverted.

[@1pcfred]

He'll have to patent this invention.

[@drobotk]

What invention?

[@1pcfred]

@@drobotk his circuit. I think he can actually copyright it which is even better than patenting. A patent is good for 20 years. Copyright does not expire until 70 years after the author does.

[@drobotk]

@@1pcfred If you look at the datasheet of the IR2153 chip, there is a "typical connections" section, and his schematic is almost identical, he just used some more mandatory components. Copyrighting schematics doesn't really make sense, everyone can come up with a similar circuit. This is not art. I hope you understand what I mean :)

[@1pcfred]

@@drobotk laws do no have to make sense. They just have to be.

[@Magneticitist]

@@1pcfred While it's a good circuit I don't think he's anywhere close to the first person to use this design. He may have the best explanation for it thus far though.

[@عاشقاللغةالعربية-ق1ش]

Má to zpětnou vazbu nebo ne?

[@picanazo420]

No cat in video? Are you kidding me guysss?

[@fumthings]

and when he connects the mains AC in the next video, we wont see the cat either.

[@gkcnalaka]

❤

[@ledhunters]

You can ask you cat but I am sure she will confirm that this video was boring. :P Waiting for the next one, where you blow something up :D LOL

[@DiodeGoneWild]

Tomorrow the mains voltage test video will be public. Wait to see if it blows up or not ;).

[@vidanatural_oficial]

a comparation with TC4420 ci drive, please.

[@drobotk]

CD4022 is an octal counter, how would that drive a half-bridge?

[@vidanatural_oficial]

@@drobotk sorry, It is a TC4420

[@drobotk]

@@vidanatural_oficial Oh, that's a different story

[@Magneticitist]

TC4420 is commonly used because it's fast and fairly powerful but the main comparison so far is that when using the low side drivers like that it's going to require what could be a lot more headache when it comes to say getting a GDT switching nicely.

[@drobotk]

Can I use BD137 & BD138?

[@drobotk]

Turns out I can, it works perfectly!

[@DiodeGoneWild]

they just have a lower voltage rating, but still enough.

[@hansmaier3689]

Try VOM1271T, very nice driver, i use lot of them

[@DiodeGoneWild]

It seems extremely slow...

[@Prosha6634]

Блин, никогда не видел осциллоскоп. Видел только гсциллографы

[@krzysztofsoja5301]

What happened to your cat? :)

[@uK8cvPAq]

What would be considered a good enough turn off time? Lets say there's a few amps average going through the fet, what's ballpark figure to aim for? I always thought a few hundred ns and below was ok.

[@rajvanshsingh2018]

Hi , Can you please make a video on how to make a variable power supply using a chip like the one you have used in you video without any external module. Please.

[@electronicguy4550]

Stop!

[@rajvanshsingh2018]

@@electronicguy4550 What stop??

[@ZZtop-gg3lu]

Asking 10 times the same question, just stop

[@rajvanshsingh2018]

@@ZZtop-gg3lu sorry brother....I wanted him to read my comment ie why i comented 10 times. SORRY SORRY SORRY SORRY SORRY SORRY SORRY SORRY SORRY SORRY SORRY SORRY SORRY SORRY SORRY

[@ZZtop-gg3lu]

@@rajvanshsingh2018 OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK You really love your repeats, just imagine when everybody would post their comments 10 times. He has a website with contact information. danyk.cz/

[@rickjljr11]

Maybe you should reevaluate how you drive the inductor instead of speeding up the IGBTs

[@Broken_Yugo]

@Heads Mess Why be a dick about it though?

[@Broken_Yugo]

@Heads Mess Eh, dude seems to get results. Virtually any commentary on stuff like this is 90% wowed morons and 10% nitpickers, so I don't see how that's a judgement of the man's competency. In any event, nobody's stopping you from making and explaining a better one if you think this series is really such a grand injustice to electrical engineering.

[@Broken_Yugo]

@Heads Mess I'm sorry for assuming earlier, is somebody stopping you from building a better one? Just want to be clear on that.

[@EliteHEAD]

If you switch it the IGBTs faster, you increase the output ringing right? Is this not the concern here?

[@PCbolt17]

Full Video of Tesla coil plzz

[@realizator5567]

Why this video is so short :'(

[@SamSpiri]

Урааа! Finally mains! Haha, I am first

[@nakrul987]

no cat?

[@saaddaas255]

you re making my ears itchy with your accent

[@rajvanshsingh2018]

Hi , Can you please make a video on how to make a variable power supply using a chip like the one you have used in you video without any external module. Please.

[@rajvanshsingh2018]

Hi , Can you please make a video on how to make a variable power supply using a chip like the one you have used in you video without any external module. Please.

[@rajvanshsingh2018]

Hi , Can you please make a video on how to make a variable power supply using a chip like the one you have used in you video without any external module. Please.

[@rajvanshsingh2018]

Hi , Can you please make a video on how to make a variable power supply using a chip like the one you have used in you video without any external module. Please.

[@rajvanshsingh2018]

Hi , Can you please make a video on how to make a variable power supply using a chip like the one you have used in you video without any external module. Please.

[@rajvanshsingh2018]

Hi , Can you please make a video on how to make a variable power supply using a chip like the one you have used in you video without any external module. Please.

[@rajvanshsingh2018]

Hi , Can you please make a video on how to make a variable power supply using a chip like the one you have used in you video without any external module. Please.

[@rajvanshsingh2018]

Hi , Can you please make a video on how to make a variable power supply using a chip like the one you have used in you video without any external module. Please.

[@rajvanshsingh2018]

Hi , Can you please make a video on how to make a variable power supply using a chip like the one you have used in you video without any external module. Please.

[@executive]

shut up

[@rajvanshsingh2018]

@@executive duck off