ElectronicBits#22 - HF Power Inductor Design

แชร์
ฝัง
  • เผยแพร่เมื่อ 29 ต.ค. 2024

ความคิดเห็น • 102

  • @jamesjohnston9319
    @jamesjohnston9319 8 หลายเดือนก่อน +1

    Just started a new job and needed to brush up on DC-DC converter design, so this course is an absoloute Godsend, many thanks prof!

  • @deepakchaturvedi5462
    @deepakchaturvedi5462 8 วันที่ผ่านมา +1

    Wow Dr. Yaakov. I keep bumping into TH-cam videos made by you.
    God bless you for your good work. 🙏☺️

  • @brandonfreese3005
    @brandonfreese3005 4 ปีที่แล้ว +5

    Currently struggling with my Power Electronics course. You are saving my life prof, thank you!!!!!!!!!!!

    • @sambenyaakov
      @sambenyaakov  4 ปีที่แล้ว +1

      Happy to help!😊Thanks for comment.

  • @RicardoPenders
    @RicardoPenders 3 ปีที่แล้ว +3

    Thanks to your videos I now have a lot less interference going back into the mains when I use my monster ZVS driver, for me it's now easier to know where the signals go and how I can isolate different frequencies, especially the high frequencies with high power from going back to the the line voltage or mains.

  • @sudhanshutelrandhe5857
    @sudhanshutelrandhe5857 5 ปีที่แล้ว +5

    Best video covering practical aspects of Inductor design. Thank you Prof. Sam.

  • @DesDes-d4x
    @DesDes-d4x 3 หลายเดือนก่อน

    What an absolutely wonderful professor. Thank you for your videos.

    • @sambenyaakov
      @sambenyaakov  3 หลายเดือนก่อน

      So nice of you. Thanks

  • @SemtexEngineer
    @SemtexEngineer 7 ปีที่แล้ว +1

    One minor error skipped through at 24:02, for the RMS value of I the 1/T term is inside the square root. Excellent video! Thank you for sharing it!

    • @sambenyaakov
      @sambenyaakov  7 ปีที่แล้ว +3

      Thank you for the correction. You have a keen eye. Sorry for the slip up. I could have said that I did it on purpose to see who would catch. But I did not :-)

  • @kimhawkk9544
    @kimhawkk9544 ปีที่แล้ว +2

    Thank you so much Prof. Sam!

  • @swh19
    @swh19 6 ปีที่แล้ว +3

    Your lectures are always enjoyable to me!!!

    • @sambenyaakov
      @sambenyaakov  6 ปีที่แล้ว

      Thanks. Comments like yours keep me going.

    • @sambenyaakov
      @sambenyaakov  6 ปีที่แล้ว +1

      Hi, I think I saw a comment fofyour regarding an equation in minute 20.06 of video (to divide by 2?). I can't locate the comment. Please rephrase as I do not understand the reason why you think that a correction is needed.

    • @swh19
      @swh19 6 ปีที่แล้ว

      Hi Professor, that's fine now. I've just figured that out. Thanks for the reply.

    • @faidularcs
      @faidularcs 6 ปีที่แล้ว

      JeffH always we are students feeling hungry for every details explaining knowledge which, got like SIR SAM BEN YAKOOV
      Thankyou

  • @damiend1221
    @damiend1221 3 ปีที่แล้ว +2

    Very practical! Thank you for this lecture and the others!

  • @popovlist
    @popovlist ปีที่แล้ว +1

    Hi professor, thanks a lot for the lecture.
    Question here, how do we take into account an offset with delta B when looking into selecting an inductor? For example I got a simulation of the flux density in a power inductor, but apart from the carrier frequency expected variation, there is a notable offset due mains frequency. So do I take that into account or look only into the ripple caused by the high frequency?

    • @sambenyaakov
      @sambenyaakov  ปีที่แล้ว

      Losses area a function of Bac but you need tp make sure that Bpk does not approach the saturation of the ferrite.

    • @popovlist
      @popovlist ปีที่แล้ว

      @@sambenyaakov many thanks

  • @shishirtrivedi3668
    @shishirtrivedi3668 ปีที่แล้ว +1

    It was a very informative video. Actually, I have been working on inductor design and after selecting a ferrite toroidal core (x1.5Ap required), I have observed that it is saturating due to very low Bsat (0.2T) of the core, I assume. After watching the video, I plan on introducing a small air gap in toroid ring core as I have a lot of area unutilized. Any thoughts on this?

    • @sambenyaakov
      @sambenyaakov  ปีที่แล้ว

      Yes, you need a gap if there is a need to store energy. See other more recent related videos in my channel.

  • @alibahrami1991
    @alibahrami1991 3 ปีที่แล้ว +1

    Very useful material. at 34:45, it is mentioned 1 Amp/m=79.5 Oe. I think it should be reversed, I mean "1 Oe=79.5 A/m" is the correct relationship.

    • @sambenyaakov
      @sambenyaakov  3 ปีที่แล้ว

      You are of course correct. Thanks for pointing out the typo.

  • @TheSecrecyOfFrequency
    @TheSecrecyOfFrequency ปีที่แล้ว +1

    Is the Core Size Selection Chart Software at 44:09 publically available? I can't seem to find it.

    • @sambenyaakov
      @sambenyaakov  ปีที่แล้ว

      As far as I remeber this is from Magnetics catalog. Copy the screen😊

    • @TheSecrecyOfFrequency
      @TheSecrecyOfFrequency ปีที่แล้ว

      @@sambenyaakov Thankyou. I had already found their site but everything seems to be in PDF form only now. But at least with your confirmation of it, I can ask them if its still around. Thanks.

  • @Stelios.Posantzis
    @Stelios.Posantzis 2 ปีที่แล้ว +1

    Prof. Ben-Yaakov, is there a core losses calculation part? Also, how come there is no copper losses equivalent? Combining the core size calculation with the copper losses (and possibly the core losses too) one could create a (probably) quite nice optimization problem.

    • @sambenyaakov
      @sambenyaakov  2 ปีที่แล้ว +1

      Thanks. These are left for homework😊Given the Delta(B), the frequency, the magnetic materiel chosen, the diameter of the wire and the mean winding length the losses can be calculated.

  • @pabloq3411
    @pabloq3411 ปีที่แล้ว +1

    Hi Professor. Why didn't you talk about skin effect? Is it already considered in some part and I did not realize? Thanks.

    • @sambenyaakov
      @sambenyaakov  ปีที่แล้ว +1

      There is that much you can put in one video
      th-cam.com/video/TPSbuUOHhUg/w-d-xo.html

  • @idk2412
    @idk2412 ปีที่แล้ว +1

    Hello Professor, again, amazing videos can't thank you enough for everything! I've recently become aware of the difference between small signal permeability and average permeability, where Uavg=B/H and Usmall_sig=dB/dH. I've always just used Uavg (Ur and/or Ue). I'm still figuring out which applications use which, but it seems generally we use Uavg within HF power inductor design. Is that correct? The reason I bring this up is that n=(L*Ipk)/(Ae*Bmax) is now a bit confusing to me notation-wise since when I think of Ipk I think of the DC component + half the ripple component. So, when using that formula shouldn't we just be using the peak average current, not including half of the ac component?

    • @sambenyaakov
      @sambenyaakov  ปีที่แล้ว

      Thanks. Have you seen doi.org/10.36227/techrxiv.14975082.v1

    • @idk2412
      @idk2412 ปีที่แล้ว

      @@sambenyaakov Thanks, I have not read that before, it was a great read on permeabilities. I'm still not sure if the paper addresses my last question about the DC component + half the ripple. Or if it does, I clearly didn't pick it up :)

  • @dezektronics3052
    @dezektronics3052 2 ปีที่แล้ว +1

    Thank you Professor for continuous sharing of inspirational ideas.
    By the way, I'm just curious, in 6:07, you define "H" as "H=nl". However, is "H" suppose to be H=nI/L, where H is the magnetising force in ampere-turns per meter (At/m)?
    .

    • @sambenyaakov
      @sambenyaakov  2 ปีที่แล้ว +1

      Yes, correct. I have put a note on that at the description section. Thanks

  • @naveenmukundan2234
    @naveenmukundan2234 2 ปีที่แล้ว +1

    Thanks for the video Prof! It was very enlightning. I have a question regarding distributed gap core. When you say the core has u= 125 does it mean that effective u is 125 or does it mean the effective mean is u0*125 (1.256e-6*125 = 0.157e-3)? Can you please clarify.

    • @sambenyaakov
      @sambenyaakov  2 ปีที่แล้ว +1

      Hi, thanks for comment. 125 is reative mu. For actual permeability you need to multiply by nu0.

  • @javieralejandromelian3579
    @javieralejandromelian3579 2 ปีที่แล้ว +1

    Dear Sam, did you design/construct laminated gno iron core ac inductors?

    • @sambenyaakov
      @sambenyaakov  2 ปีที่แล้ว

      Not really I am working on high switching frequency systems

  • @SuperSharonpaul
    @SuperSharonpaul 4 ปีที่แล้ว +2

    Thank you so much for the lecture professor! can you please tell why the number of turns and the Window area depends on the RMS current, while the cross sectional area depends on the peak current in 20:29

    • @sambenyaakov
      @sambenyaakov  4 ปีที่แล้ว +1

      Rms determices the cross section of wire and area of wires and time n is the area you need in window which we what to fill. Ae is bound by the constraint Ipk L= n Ae Bmax

  • @karastom2304
    @karastom2304 ปีที่แล้ว

    Thanks Dr Sam, very good explanation
    In resonance circuit we have to pick inductor with high Q, is this means that inductance will be stable and not vary when Q is high? and how we can figure required value that we need it?

    • @sambenyaakov
      @sambenyaakov  ปีที่แล้ว

      in power electronics we talk about series resistance and not Q High Q basically means low Rs. In power electronics some changes in inductance are tolerated because the systems usually works in closed loop.

    • @karastom2304
      @karastom2304 ปีที่แล้ว +1

      @@sambenyaakov thanks Dr Sam
      But there are some materials that have high Q
      And resistance depending on wires , so Q related to materials not to wires?
      Is that right

    • @sambenyaakov
      @sambenyaakov  ปีที่แล้ว

      @@karastom2304 Sure you are correct, core losses account. But still, in RF circuits of low power we worry about Q, in power electronics we talk about losses.

  • @HL65536
    @HL65536 2 ปีที่แล้ว +1

    Do the maximum stored energy and/or core losses change with introducing an air gap into a ferrite core?

    • @sambenyaakov
      @sambenyaakov  2 ปีที่แล้ว

      See th-cam.com/video/VsRsgDJMSqw/w-d-xo.html&feature=share

  • @jimidjoriginal9295
    @jimidjoriginal9295 2 ปีที่แล้ว +1

    Hello professor, this was a very nice lecture but i can't seem to understand the RMS value at 23:30. First of all I have seen the comments below and i know that 1/T should be inside the square root, i suppose that the integral limits should be at a given period of time (0 to T for example) but i am not sure about the equivalent equation of inductor current (IL). I used LTSpice in order to simulate the situation on a buck converter during DCM and CCM operation but i can't seem to find the right value of RMS current through the inductor with calculations, the value differs completely from the calculated value of LTspice. Last thing i want to mention is that i have seen the generic corresponding formula of a periodic signal over time from Wikipedia (Definition - Equation 2), should the f(t) (corresponding inductor current - IL) be replaced with the typical equation of V = L*di/dt or something else? Thank you.

    • @sambenyaakov
      @sambenyaakov  2 ปีที่แล้ว

      Sorry too involved, I cano't go into it.

  • @eralp2726
    @eralp2726 ปีที่แล้ว +1

    Dear Professor,
    Can I get slides for my academic study?

    • @sambenyaakov
      @sambenyaakov  ปีที่แล้ว

      Sorry, these are not available.

  • @saadthabit5694
    @saadthabit5694 7 ปีที่แล้ว

    well done Mr. Ben Yaakov

  • @nachiketadeshmukh8444
    @nachiketadeshmukh8444 2 ปีที่แล้ว +1

    Sir, Why is it that the cores with discrete air gap have a sharp saturation, whereas powder iron cores with distributed air gap have a soft saturation? Can you please justify physically?

    • @sambenyaakov
      @sambenyaakov  2 ปีที่แล้ว

      Good question. I am not sure, perhps has to do with the nature of the ferromagnetic powder?

  • @umakanthbojanapalli3240
    @umakanthbojanapalli3240 3 ปีที่แล้ว

    Valuable information sir

  • @ashokchakravarthi87
    @ashokchakravarthi87 5 ปีที่แล้ว

    Hello Professor, is there any alternate way for selecting distributed core size without seeing manufacturers LI^2 curves.

    • @sambenyaakov
      @sambenyaakov  5 ปีที่แล้ว

      The LI^2 are really not a design tool but rather a pointer to the approximate core you need. You can use the AP approach to locate core.

  • @karastom2304
    @karastom2304 6 ปีที่แล้ว

    Hi Dr Sam, thanks so much , as usual you are amazing , your lectures are very helpful . i have question about the Ac ,i do not see in the equations the effect of frequency on Ac, like when frequency is high we should be able to use smaller Ac , and also what is the effect of the topology (forward, flyback,half bridge, full bridge on the Ac.
    Thanks so much Dr Sam

    • @sambenyaakov
      @sambenyaakov  6 ปีที่แล้ว

      Hi Karas, This video is a very basic tutorial. Additonal issues are covered in the new
      th-cam.com/video/r-hK2OZp5D0/w-d-xo.html

    • @shivannagovindappa5672
      @shivannagovindappa5672 2 ปีที่แล้ว

      Frequency decides the value of Inductance,Higher the frequency lower the L as you need to store power for shorter time and less LI

  • @babylonfive
    @babylonfive 8 ปีที่แล้ว

    Great stuff.

    • @VasanthBattula
      @VasanthBattula 6 ปีที่แล้ว

      Respected professor Is HF transformer and HF inductor are same?

  • @siamak1246
    @siamak1246 7 ปีที่แล้ว

    Dr. Yaakov, could you tell me a company that make toroidal distributed air gap core (8:44). I need this type for my project. Thanks

  • @catalin3407
    @catalin3407 6 ปีที่แล้ว

    At 32:20 , mu0 (magnetic permeability of free space) is 4*Pi*10^(-7), but in the video they show it is "-8". Can you explain why is this, please?

    • @sambenyaakov
      @sambenyaakov  6 ปีที่แล้ว

      Units. l is in cm and A in cm^2

    • @catalin3407
      @catalin3407 6 ปีที่แล้ว

      Yes, I saw that. It did not make sense because I did not see the "dot" in front of the "4". So it is actually 0.4*Pi*10^(-8) H/cm, which by the way I think you have a typo at 32:26

    • @sambenyaakov
      @sambenyaakov  6 ปีที่แล้ว

      You are correct. I guess I also did not see the dot and didn't ponder about the value. Thanks.

  • @boubalex5846
    @boubalex5846 5 ปีที่แล้ว

    you are awesome, really thank you

  • @pavanp611
    @pavanp611 4 ปีที่แล้ว

    Can you pls guide me to arrive at core cross section Area if only secondary voltage and primary current of 30A rms is available .

    • @sambenyaakov
      @sambenyaakov  4 ปีที่แล้ว

      How about turns ratio and frequency?

    • @pavanp611
      @pavanp611 4 ปีที่แล้ว

      Sam Ben-Yaakov sir, frequency is 50hz and the power drawn is 10mW from the CT. Turns ratio I have to arrive . I dint have turn ratio too

    • @pavanp611
      @pavanp611 4 ปีที่แล้ว

      Sir can u take up a session on how to arrive at cross sectional area and no of turns, if we draw power from CT.

  • @nachiketadeshmukh8444
    @nachiketadeshmukh8444 2 ปีที่แล้ว +1

    Sir, Please add a note -
    n * I = mmf (manetomotive force)
    mmf/length = H

  • @chitrasingh9200
    @chitrasingh9200 5 ปีที่แล้ว

    Did you write any book for SMPS or power electronics

  • @ankitkherodiya2961
    @ankitkherodiya2961 6 ปีที่แล้ว

    Awesome Lectures. Great work.
    Can you upload some lectures on pcb design & layout consideration for SMPS? Thanks

  • @VasanthBattula
    @VasanthBattula 7 ปีที่แล้ว

    Excellent sir

    • @sambenyaakov
      @sambenyaakov  7 ปีที่แล้ว

      Thanks. I am happy that the video caters to the young :-)

  • @johnconrad5487
    @johnconrad5487 8 ปีที่แล้ว

    thanks for sharing the video

  • @faidularcs
    @faidularcs 6 ปีที่แล้ว

    Dear sir please do a video of HF TOROIDAL inductor design with details
    Thankyou

    • @sambenyaakov
      @sambenyaakov  6 ปีที่แล้ว

      see th-cam.com/video/6Mi8QDD71vE/w-d-xo.html

  • @appassets
    @appassets 6 ปีที่แล้ว

    Where can I get a copy of these slides?

    • @sambenyaakov
      @sambenyaakov  6 ปีที่แล้ว

      Hold on, I may be able to dig them for you.

  • @UsmanKhan-cj2bc
    @UsmanKhan-cj2bc 6 ปีที่แล้ว

    Sir how to calculate MLT if not available in data sheet ??

    • @sambenyaakov
      @sambenyaakov  6 ปีที่แล้ว

      Look at cross section drawing. find the approximate radius of the mid winding R and the 2*Pi*R

  • @VasanthBattula
    @VasanthBattula 6 ปีที่แล้ว

    At 9.44 it is called fringing effect

    • @sambenyaakov
      @sambenyaakov  6 ปีที่แล้ว

      Thanks.

    • @VasanthBattula
      @VasanthBattula 6 ปีที่แล้ว

      Respected professor may I know the status of my application