This video is absolutely the best piece of info. Ive found anywhere on internet.ive been stumbling with igbts ever since i started with them 6mo.ago.im taking notes on this video.😃
Very interesting, I am just about to start experimenting with IGBT's for a 15KW fast charger for EV battery's and your IGBT videos have give me some great ideas and based on your comments I have ordered some driver IC's and various other parts you mention in the videos,I may make some videos of my experiments to share with others,Well Done and keep up the good work...............
well explain, i really need your help, i want to run air conditioner compressor up to 40amp 220volt with fz800r12kf4, it is a 1200v 800amp igbt, , can you help me with the gate circuit diagram
Pretty good but what currents were you running? if the current was minor for the IGBT it might behave a lot nicer than if significantly stressed. I have certainly seen far bigger ringing in my setup. It might also be interesting to measure a rough thermal dissipation in the IGBT vs gate resistor to get a sense of how substantial the thermal trade off is for low ringing. And a final aspect which is particularly interesting is how significantly does it affect lifespan. Does ringing up to the 600V limit cut its life by a factor 1000 or is it really completely insignificant. Is it only RF considerations or is it actual reliability. Bonus aspect :) can you switch hard and have a say 450V TVR diode in parallel with the IGBT to drink the spikes and protect the life of the IGBT that way while having a sharp switcher.. And if you want to refine a video, maybe consider rewording/editing for maximum concision so a 13 minute video could be 5 or even less without loss of content. In principle I think a video like this could be a crystal clear 30 seconds without rushing anything. Just a thought. Good video though. These are interesting topics. Mastering proper use of an IGBT makes things very easy.
+Dan Frederiksen Yes I think you are right about these points. Thing is I have shown in a few videos what happens at very high currents with extreme ringing, and a few other videos operating IGBTs with liquid cooling in conditions where they would normally melt down. I make one video where I think I've covered it all, but then newcomers ask a specific question I have already answered. I then feel the need to make a new one. But I think I'm going to try a different approach. But as far as some of your questions... I do believe riding the voltage limit is stressful, but I can't say more stressful than being thermally overloaded. Really depends though. Riding the voltage limit might be okay if we did not have to deal with cosmic rays (strange, I know) IGBTs operating at higher voltages tend to have problems, especially at high altitude. Thermally though, it is the cycling that really hurts the IGBT. for example in an EV, if you're in stop and go traffic, the IGBTs are heating and cooling cyclically, so the repeated thermal expansion is certainly a factor. As for using an external fast diode for an IGBT, apparently this does work, I've seen it done numerous times with tesla coils. Thank you for your thoughts and thanks for watching
Nice info abt the gate resistance. sir, I have 20kw of induction heating machine. It runs very well, bt the problem I am facing is, after every 15 minutes my input current falls by 0.5 Amps. Since my frequency is also matching (primary to secondary of impedance/ coupling transformer). Let us consider I switch ON my machine, I measure current 5 Amps. After 15 minutes it falls to 4.9, 4.8,4.7, 4.6....4.0, 3.7,3.2,....2.5,2.1,......and so on. What the reason would be ?????
Nice to see you're back;) Could you maybe elaborate on where to make the specific measurements? I've had different results depending on the length of my ground wire for my oscilloscope probe. I normally measure directly between G-S on my FETs; you mention the output of the gate driver? Thanks for the explanation;) Best regards, Jesper
tell me I want. need to know! like if I had a irfz44N . on a 22-29 volt circuit . what resistors would I need. I been watching videos. all I have learned . is my head hurts! I been watching videos . trying to learn this stuff. now I need to build a alternator voltage regulator . don't know if you know anything about them. but I need a get to ground the rotor. the pos. side is directly connected. to the brush. the start switch needs to turn on the gate. then it needs about a 26 v zener diode to turn on the gate of another N channel. this one shorts the gate of the first one. shutting it off. it works like a pwm to regulate the output voltage. so the zener shuts off the power. to the rotor brushes. when the voltage gets high enough. when it drops a bit . the reverse zener stops conducting. allowing the first get to turn on. then repeat many times a sec. the rotor is like a 10-15 amp load or less. I need help with choosing FETs and resistors. I was going to do the trial and error thing. however I hate burning components. when it can be prevented! any advice? thanks a lot either way!
First, do you have an oscilloscope? If not, get one. You'll never know why your components are being destroyed without one. You must be able to check the gate voltage waveform. If it is switching too fast or too slow that will cause problems. I can recommend gate resistors all day, but without seeing the actual waveform, I'm just guessing. Same goes for the Drain - Source voltage, you need to see how quickly the MOSFET is actually switching. Second, you need to be using a freewheeling diode. using just one MOSFET won't provide adequate protection. The back voltage from the rotor will certainly be enough to destroy an IRFZ44N without a freewheeling diode. So if you aren't using one, put one in the circuit Third, simulate. Use something like LTSpice and simulate a MOSFET switching an inductive load before doing so in the real world. Resistors and MOSFETS are free in LTSpice and they never blow up. So I highly recommend simulation first before going into the real world. Check the voltages and currents in the simulator, when you are comfortable with them, then try the same circuit in the real world. If you have any other questions, feel free to respond here or message me. Thanks for watching.
Thanks for the great video. I posted a question before regarding paralleling IGBTs. From all I've been reading, one method to reduce parasitic inductance is using a ferrite bead between the gate resistor and IGBT. You pick a size that saturates at your drive frequency and then it imparts a given resistance (so you'd pick a smaller value resistor also). From what they say it takes care of some of the inductance issues as long as you don't pick one that itself has too much inductance. I was wondering if you have any experience with using ferrite beads like this or have any opinions? Thanks again.
I don't have much experience with paralleling IGBTs, but from what I know it seems like using a common mode choke (probably with a ferrite) does seem to reduce inductance and mismatch between the gate driver and two IGBT modules.
This video is absolutely the best piece of info. Ive found anywhere on internet.ive been stumbling with igbts ever since i started with them 6mo.ago.im taking notes on this video.😃
Very interesting, I am just about to start experimenting with IGBT's for a 15KW fast charger for EV battery's and your IGBT videos have give me some great ideas and based on your comments I have ordered some driver IC's and various other parts you mention in the videos,I may make some videos of my experiments to share with others,Well Done and keep up the good work...............
I was just wondering why we have not seen a vid from you in some time. I have learned so much from you. keep up the good work.
Watching blue screen for sometime I was about to skip. But then it found its a gr8 video.
what is the value of pull down resistor to be used for igbt gate driver ?
well explain, i really need your help, i want to run air conditioner compressor up to 40amp 220volt with fz800r12kf4, it is a 1200v 800amp igbt, , can you help me with the gate circuit diagram
Excellent videos and awesome practical information!
I want to know that when driver IC itself take less power than how it provide high power to drive IGBT?
Pretty good but what currents were you running? if the current was minor for the IGBT it might behave a lot nicer than if significantly stressed. I have certainly seen far bigger ringing in my setup. It might also be interesting to measure a rough thermal dissipation in the IGBT vs gate resistor to get a sense of how substantial the thermal trade off is for low ringing.
And a final aspect which is particularly interesting is how significantly does it affect lifespan. Does ringing up to the 600V limit cut its life by a factor 1000 or is it really completely insignificant. Is it only RF considerations or is it actual reliability.
Bonus aspect :) can you switch hard and have a say 450V TVR diode in parallel with the IGBT to drink the spikes and protect the life of the IGBT that way while having a sharp switcher..
And if you want to refine a video, maybe consider rewording/editing for maximum concision so a 13 minute video could be 5 or even less without loss of content. In principle I think a video like this could be a crystal clear 30 seconds without rushing anything. Just a thought.
Good video though. These are interesting topics. Mastering proper use of an IGBT makes things very easy.
+Dan Frederiksen Yes I think you are right about these points. Thing is I have shown in a few videos what happens at very high currents with extreme ringing, and a few other videos operating IGBTs with liquid cooling in conditions where they would normally melt down. I make one video where I think I've covered it all, but then newcomers ask a specific question I have already answered. I then feel the need to make a new one. But I think I'm going to try a different approach. But as far as some of your questions... I do believe riding the voltage limit is stressful, but I can't say more stressful than being thermally overloaded. Really depends though. Riding the voltage limit might be okay if we did not have to deal with cosmic rays (strange, I know) IGBTs operating at higher voltages tend to have problems, especially at high altitude. Thermally though, it is the cycling that really hurts the IGBT. for example in an EV, if you're in stop and go traffic, the IGBTs are heating and cooling cyclically, so the repeated thermal expansion is certainly a factor. As for using an external fast diode for an IGBT, apparently this does work, I've seen it done numerous times with tesla coils. Thank you for your thoughts and thanks for watching
Good and right explication !!
hello a help how can I activate an igbt module TM03C to make it work.
can you tell me type and model of your snubber?
Nice info abt the gate resistance.
sir, I have 20kw of induction heating machine. It runs very well, bt the problem I am facing is, after every 15 minutes my input current falls by 0.5 Amps. Since my frequency is also matching (primary to secondary of impedance/ coupling transformer). Let us consider I switch ON my machine, I measure current 5 Amps. After 15 minutes it falls to 4.9, 4.8,4.7, 4.6....4.0, 3.7,3.2,....2.5,2.1,......and so on. What the reason would be ?????
I’m making an electric car with a series would DC motor. I’m trying to make the controller. I know the basics but need help.
Nice to see you're back;) Could you maybe elaborate on where to make the specific measurements? I've had different results depending on the length of my ground wire for my oscilloscope probe. I normally measure directly between G-S on my FETs; you mention the output of the gate driver? Thanks for the explanation;)
Best regards,
Jesper
tell me I want. need to know! like if I had a irfz44N . on a 22-29 volt circuit . what resistors would I need. I been watching videos. all I have learned . is my head hurts!
I been watching videos . trying to learn this stuff. now I need to build a alternator voltage regulator . don't know if you know anything about them. but I need a get to ground the rotor. the pos. side is directly connected. to the brush. the start switch needs to turn on the gate. then it needs about a 26 v zener diode to turn on the gate of another N channel. this one shorts the gate of the first one. shutting it off. it works like a pwm to regulate the output voltage. so the zener shuts off the power. to the rotor brushes. when the voltage gets high enough. when it drops a bit . the reverse zener stops conducting. allowing the first get to turn on. then repeat many times a sec. the rotor is like a 10-15 amp load or less. I need help with choosing FETs and resistors. I was going to do the trial and error thing. however I hate burning components. when it can be prevented! any advice? thanks a lot either way!
First, do you have an oscilloscope? If not, get one. You'll never know why your components are being destroyed without one. You must be able to check the gate voltage waveform. If it is switching too fast or too slow that will cause problems. I can recommend gate resistors all day, but without seeing the actual waveform, I'm just guessing. Same goes for the Drain - Source voltage, you need to see how quickly the MOSFET is actually switching.
Second, you need to be using a freewheeling diode. using just one MOSFET won't provide adequate protection. The back voltage from the rotor will certainly be enough to destroy an IRFZ44N without a freewheeling diode. So if you aren't using one, put one in the circuit
Third, simulate. Use something like LTSpice and simulate a MOSFET switching an inductive load before doing so in the real world. Resistors and MOSFETS are free in LTSpice and they never blow up. So I highly recommend simulation first before going into the real world. Check the voltages and currents in the simulator, when you are comfortable with them, then try the same circuit in the real world.
If you have any other questions, feel free to respond here or message me. Thanks for watching.
Thanks for the great video. I posted a question before regarding paralleling IGBTs. From all I've been reading, one method to reduce parasitic inductance is using a ferrite bead between the gate resistor and IGBT. You pick a size that saturates at your drive frequency and then it imparts a given resistance (so you'd pick a smaller value resistor also). From what they say it takes care of some of the inductance issues as long as you don't pick one that itself has too much inductance. I was wondering if you have any experience with using ferrite beads like this or have any opinions? Thanks again.
I don't have much experience with paralleling IGBTs, but from what I know it seems like using a common mode choke (probably with a ferrite) does seem to reduce inductance and mismatch between the gate driver and two IGBT modules.
Great Video but it would have been much helpful if you had showed a schematic
I have viewed several of you videos and I was hoping to get in touch with one another if you are able.
you are awesome!!!!!!!!!!!!
Nice !! Thumbs up !!
Alex
I’m starting to dislike these things.