Miller Plateau effect within MOSFETs explained - a simple and intuitive approach

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  • Опубліковано 24 гру 2024

КОМЕНТАРІ • 76

  • @damithDeAlwis
    @damithDeAlwis Рік тому +14

    Everyone explains "what" miller effect. But no one answers the most important one, which is the "why", miller effect .
    This video is the best one so far.

  • @uncontrollabledogs3791
    @uncontrollabledogs3791 11 місяців тому +1

    How nice to actually"see" what is happening with the gate capacitance. Would like to see more similar videos.

  • @axelschmidt6814
    @axelschmidt6814 Рік тому +4

    well done Ari, best explanation I ever have seen.

  • @electricblue8707
    @electricblue8707 Рік тому +12

    You are brilliant at explaining things, thank you

  • @superdau
    @superdau Рік тому +6

    I don't know why youtube recommended this video to me, but it was worth it! (I mean, I do watch videos about electronics once in a while and do design electronic circuits). I knew that the miller plateau existed, but this video made me understand it in the first 3 minutes.
    Btw. love the "no we are going to go to the lab" which literally means sitting down right where you are standing 😆.
    [edit] there are also a few gems among your other videos! Thanks!

    • @austinwild5249
      @austinwild5249 Рік тому

      lol, I'm glad I'm not the only one that laughed about this.

  • @Exarhadsgfds
    @Exarhadsgfds Рік тому +2

    Another great video professor!
    Greetings from Slovenia

  • @jasongreene303
    @jasongreene303 Рік тому +8

    A nice short, sweet, and perfect explanation with a great teaching method, thank you!
    I would like to ask about noise that may be generated due to fast switching, would it be a concern at all?

    • @str8upkickyaindanuts289
      @str8upkickyaindanuts289 Рік тому +2

      @jasongreene303 Exceptional observation, the answer to your question is absolutely yes. As the switching node dV/dt increases EMI increases, in the real world you are constantly battling the effects of EMI which is always a performance trade off. As mentioned in the video switching losses increase the slower you turn on the MOSFET. Snubber circuits can help cheat the pitfalls of hard switching a MOSFET but cost and complexity increase. You will always have to keep in mind that even if the circuit works it doesn't mean it's optimized, that's where the rubber hits the road. It would be great if we could hard switch everything but the truth is it's only acceptable on the bench. I suggest reading device manufactures application notes on the subject to better understand methods of avoiding EMC problems. Great question, you deserve a cookie.

    • @jasongreene303
      @jasongreene303 Рік тому +1

      @@str8upkickyaindanuts289 You are very kind, thank you.
      I have to admit that I am aware of the interference from switching supplies as it makes for some horrible noise in my HF receivers, but I am not familiar with exact circuit design specifications other than the noise I see on a scope in a video such as yours. I wish more manufacturers were responsible about this.
      I look forward to perusing your library of information. Thank you

  • @wi_zeus6798
    @wi_zeus6798 Рік тому +3

    Thanks for the practical demo!

  • @chinmoytahbildar3278
    @chinmoytahbildar3278 Рік тому +2

    Please more and more videos.
    It really helps a lot sir

  • @salehpaz
    @salehpaz Рік тому +4

    Thank you for your great explanation!

  • @amrmusa7217
    @amrmusa7217 3 місяці тому

    now that was amazing thanks very much for the simple theoretical explaining

  • @simonbour56p
    @simonbour56p Рік тому +2

    Great explanation, thanks!

  • @marupuruvinodmarupuruvinod3181

    great work sir, your explaining complicated things so easily

  • @krish2nasa
    @krish2nasa Рік тому +1

    Excellent explanation. Thank you very much.

  • @martantoine9977
    @martantoine9977 Рік тому

    Crystal clear explanation, thank you

  • @hugohuaman1487
    @hugohuaman1487 Рік тому

    Wonderful explanation, Thank you Professor

  • @neail5466
    @neail5466 Рік тому

    Superb, really appreciate it.

  • @aviationenthusiast4353
    @aviationenthusiast4353 Рік тому

    can you explain why the capacitance moved at 2:34? not sure why turning on the MOSFET changed the capacitance. thank you!

  • @maheerashid5477
    @maheerashid5477 5 місяців тому

    Beautiful explanation

  • @NoName-gh5zt
    @NoName-gh5zt 7 місяців тому

    Thank you. you are the best teacher.

  • @baghdadiabdellatif1581
    @baghdadiabdellatif1581 Рік тому

    Great work 👌

  • @31_muhammadnurwahid83
    @31_muhammadnurwahid83 9 місяців тому

    Thanks for your great explanation

  • @yangli411
    @yangli411 Рік тому +1

    I watched 3 times and seemed got what he meant in details. When Vth just reached at the gate, drain voltage is on the way to be connected to source which is grounded. This is when Cgd will be discharged and then get re-charged at the opposite direction from the positive gate voltage. The plateau forms as the Vgs is “waiting” for Vgd to be recharged before rising up again

  • @ionix2000
    @ionix2000 8 місяців тому

    Very well explained. Thank you!

  • @louco2
    @louco2 9 місяців тому

    Thank you so much for these videos, love to learn something new!

  • @RixtronixLAB
    @RixtronixLAB Рік тому +1

    Nice video, well done, thanks for sharing it with us :)

  • @prutser67
    @prutser67 Рік тому

    Very nice explanation 😊

  • @MithunKumarV-h8b
    @MithunKumarV-h8b Рік тому

    Thank you for the explanation

  • @supersilve
    @supersilve Рік тому

    I am having issus of IGBTs heating up and tend to fail. I replaced with genuine and same part on the 3KW HB smps. A spike is being generated in the middle of the rise time charging of the IGBT. Tried a lower value than 10R but things got worse. I am afraid if I change to a higher value such as 15 or 20R as this will even slow more the charging time. How can I cure this problem?

  • @zmix
    @zmix 10 місяців тому

    Is there a point where the device can be biased to exhibit neither the plateau nor the overshoot (as displayed on the oscilloscope)?

  • @dora9103
    @dora9103 Місяць тому

    but if it's too fast , wouldn't it produce ringing for the MOSFET? I don't quite understand, please enlighten me

  • @ahmedkamil7655
    @ahmedkamil7655 Рік тому

    Very very very good explain

  • @啊叭啊叭啊叭
    @啊叭啊叭啊叭 Рік тому +1

    Thank you!

  • @huongtandong1978
    @huongtandong1978 Рік тому

    I really appreciate this video
    I wish the professor had Vietnamese subtitles

  • @electronichome1153
    @electronichome1153 Рік тому +1

    Sehr gut! Danke!

  • @jagmarc
    @jagmarc Рік тому +1

    Nice presentation. They should invent a screen grid for mosfet

    • @RexxSchneider
      @RexxSchneider Рік тому +1

      Some of the early mosfets from the early 1970s were 4-terminal devices, having two gates. This made them good rf amplifiers as you effectively had a cascode arrangement which minimised the Miller effect by fixing the voltage on the upper gate, thus clamping the voltage on the drain of the lower part.

    • @jagmarc
      @jagmarc Рік тому

      @@RexxSchneider yes I realised cascode a short while after I wrote the comment but rather than delete it I thought make a fun comment for someone to read. Cascode goes back to thermionic valves probably further.
      I've had great fun with 3N201s and 3SK88s and the like. The great thing about them is a pair makes a superb balanced modulato. These dual gate mosfets also make a fabulous VFO oscillator output buffer with nearly infinite isolation. Also make great AGC control elements in a IF amp.

  • @deejayobenn160
    @deejayobenn160 11 місяців тому

    Meaning slightly fast switching... let's say 15 ohms gate resistor will be enough to minimize ringing and getting slightly fast switching?

  • @jagmarc
    @jagmarc Рік тому

    Suggestion add mark-up to video showing where the drain voltage dv/dt is. Just to confirm

  • @arnoldtoth7926
    @arnoldtoth7926 8 місяців тому

    In the turn OFF, there is only lets say 5V difference between the Gate and the source, instead of the 100V difference. Can someone explain that please?

  • @michaelandreaspurwoadi1325
    @michaelandreaspurwoadi1325 Рік тому

    Thank you ...

  • @neccron9956
    @neccron9956 Рік тому

    How does the Miller Plateau effect MOSFETs in audio circuits? And is it a concern?

  • @doronlola1763
    @doronlola1763 8 місяців тому

    Thank you ❤

  • @biswajit681
    @biswajit681 Рік тому

    But my doubt is before reaching to miller platue why current doesn't not flow through the CGd ? Lets say your drain node is fixed but when it's charging Cgs then bottom node voltage is changing then there should be current flowing through the Cgd also before Vds starts falling out..

    • @RexxSchneider
      @RexxSchneider Рік тому +1

      The Miller effect occurs because there is voltage amplification between gate and drain. As the turn-on threshold is reached and the mosfet begins to turn on, a small increase in gate voltage produces a much larger decrease in drain voltage, and that applies a negative feedback via Cgd. So the gate voltage cannot rise, nor the drain voltage fall unless current flows to discharge Cgd. That is the Miller plateau.

  • @saeednadalizadeh-cl7ke
    @saeednadalizadeh-cl7ke Рік тому

    سلام اقای شیر سروار اگر کانال یا پیج به زبان فارسی دارین ممنون میشم معرفی کنید .

  • @vardanmarkosyan5211
    @vardanmarkosyan5211 Рік тому

    Thanks!

  • @younesthabet
    @younesthabet Рік тому

    if the aim is to reduce the miller plateau then why do we put the gate resistor in the first place .. ?

    • @kadamrohan16
      @kadamrohan16 Рік тому +2

      The gate resistance here is not always physically placed component but simple representation of gate drivers output current limitation.

    • @younesthabet
      @younesthabet Рік тому +2

      @@kadamrohan16 I have seen an external gate resistor used often in gate driver circuits. It may have some other purpose.

    • @kadamrohan16
      @kadamrohan16 Рік тому +4

      Many times they use it to damp gate ringings.

    • @jagmarc
      @jagmarc Рік тому +2

      The MP is always there and it's a secondary effect. It's like lights go dim when switch a big motor on.
      By watching 'lights go dim' you can detect when there's a current drain.

    • @RexxSchneider
      @RexxSchneider Рік тому +2

      A capacitance is equivalent to an instantaneous short circuit and there must be some limit to the current drawn from the driver. Either the driver limits that itself, or we put a gate resistor in series to set the maximum current drawn. An additional consideration is that if the driver switches rapidly -- and we normally want it to -- then any inductance in the line from the driver to the mosfet gate will create a closed LC circuit via the grounds of the diver and mosfet source, which will cause ringing, or even oscillation, unless it is damped by sufficient resistance in series.

  • @qno-oj3py
    @qno-oj3py Рік тому

    It's a kind of bootstrap capacitor.

  • @Chris_Grossman
    @Chris_Grossman Рік тому +1

    There is an additional charge from gate to channel you have ignored in this simplified analysis . Once charge starts to flow in the channel and equal amount of charge must be supplied to the gate. This is fundamental to all three terminal devices to which are governed by charge control model in their linear operation regions. Why did you ignore that charge?

    • @okbamed2239
      @okbamed2239 Рік тому +5

      He just explained the miller plateau caused by the nonlinear capacitor Cgd

  • @PavolFilek
    @PavolFilek Рік тому

    Hi Dr. Shirsavar, what is causing differences in CH2 curve - Vds, if I used this 2 FETs ? Qg or Coss ? Is there also impact from different Qrr and trr ? ua-cam.com/video/HMUD1pbp6eA/v-deo.html

  • @rasikabusan
    @rasikabusan Рік тому

    hello

  • @metehandemirel4914
    @metehandemirel4914 Рік тому

    those drawing could have been better imo

  • @shyamofmace
    @shyamofmace Рік тому

    Explanation is not great…

  • @ronb3561
    @ronb3561 Рік тому

    Amazing explanation! Thanks!