Great video, thank you for explaining this. I couldn't find that information anywhere else. You deserve many many more subscribers for that awesome content you provide. (Sorry for my English )
Wow! One of the best video on YT i have ever seen. Well explained, in-depth analysis and practical. You should be teaching in MIT sir. I subscribed to your channel. I am in second year of electrical engineering and I was looking for MOSFET driving technique. You did it all with flying colours. Although this video is 5 years old but I do have a question hopeing you would be able to reply. What if I don't use low side switchng option, for example I am only interested in high side switching: Do I still need the second MOSFET/IGBT? Thank you again .
If i connect VCC +10v positive wire,where do I connect the negative side of the wire? Can I connect negative wire 10v to 300V ground? And if I don't connect negative wire what will happen? Because I don't see in the diagram where the the negative wire for vcc goes to?
What if I'm trying to make h bridge type. If I have high side connected to low side (top left connected to bottom right mosfet), how can I get a signal for my low side since it will require regular gate signal?
Hi there, great video, very well explained. One question - don’t you need to tie the high side switch’s source pin back to the chip for the bootstrap capacitors to work? Your schematic doesn’t show that, I was wondering if your breadboard does? Cheers, Stuart.
Hi stuart, yes you do! I must have missed it, it should go to the Vs pin, this basically sets the reference voltage, allowing you to provide the gate with a higher voltage. Thanks for picking that up!
Dude! That's a great video you have here. It's well explained that too with great details. I wanted to try that Steve Ward burst mode interrupter with a TV flyback transformer but I'm just hesitating as I don't wanna blow up the ne555 & my mosfet! I've already built the interrupter but from there I just don't know which mosfet to use & what kind of circuit to build to get that burst mode interrupter drive that TV flyback! Any specific circuit I can use without blowing up anything? I've already tried out different ZVS drivers & they've all worked out well. But now I just want to control the output of that flyback through that interrupter. Thanks in advanced dude. Anyway, very nicely done video, keep it up with the good work & keep us updated. Don't forget about me! Thanks
Just watch your dead time (time between mosfets all being off) it needs to be long enough so you don’t get shoot through, but short enough not to get to high inductive kick back (although, the body diode sorts that out!)
Hey, nice explained...I had 1 Q ..if we check this driver ic then we connect 1 prob to Pin 1 and another to Pin 7 at that time which connection are mandatory ? Plz expln me..bz if I removing the gate terminal connection of driver ic then which connection are mandatory? Bz my IC. Not working properly n haves only Pin 7 waveform not of Pin 1
Make sure you have a low side switch that's actually switching, this is needed to charge up the bootstrap capacitors, and allow you to get a high side output switching. Otherwise, it'll have a square wave for a little bit, then it'll start getting smaller and eventually stop
Hey there! It’s been a while since I watched the video, so I’m not exactly sure what bit you’re referring too, but I think I’m talking about the floating high side supply. The gates of the high side FET needs to be 12v higher than the source to completely turn on. Usually your highest voltage available to you is the source voltage, and if that’s what you’re switching, then you can’t have one 12v higher. So, you can solve this with an isolated 12v supply, which is what the driver supplies. Does that make sense?
FGEN would go to the HIN and LIN, make sure you add some dead time switching before and, and the that its a square wave (and that they're 180Deg out of phase)
Hey there! The voltage divider comes about due to the fact that the voltage across a capacitor is V=Q/C. For capacitors in series, you can get the following equation: Vx = Vsupply * Ctotal/Cx Where Vsupply is your supply voltage, Cx is the capacitance of the capacitor you want to know the voltage across, and Ctotal is the total capacitance. In the video example, the voltage is half the supply voltage because both capacitors have the same capacitance. Here's a great link if you're interested - www.electronics-tutorials.ws/capacitor/cap_7.html
Hello, I am a student of energy engineering and I found your video very useful. I am trying to make a project on this subject and I have not found such good videos on this subject anywhere, so thank you. I am Turkish and I study English. For this reason, there were some things in my head in your video. I would be very glad if you can write me especially these Mosfet, Frequency parts in English.
Hey there, I've added a calculation spreadsheet, towards the bottom there is the equations for the bootstrap caps. I hope that helps :) drive.google.com/file/d/19r8iiCNZjyBqt9HbASzf1p1PMgqs6Uli/view?usp=sharing
The high side channels use the bootstrap circuit for getting a floating 12V gate supply. This is with reference to the high side nmos source pin. In order to switch the FET, the gate has to be driven with a voltage higher than the drive voltage, since this is typically the largest voltage you have available, the most common solution is to use a bootstrapped supply (the high side channel)
Depends on your implimentation, whether its an FGPA, uC, or you're using some other method. I've used 25nS before, but this was with an FPGA so a little easier to control. If your gate resistor is reasonable small, then you can set a smaller deadtime. If it's large, or your gate capacitance of your mosfet is large, then the RC time constant would be large, and hence you need a longer dead time. Start with something like 100nS, and measure the gates of the highside fet and low side fet. Look for any cross over between the two state changes - you should see a clear period where both fets are off. If not, increase the dead time some more. Good luck!
I'm not sure what you mean, but if you provide a switching signal to the hin (at 5v) as long as the bootstrap circuit is currently set up it should switch a high side MOSFET
