Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Recent content by CataM

  1. C

    [SOLVED] Iron sheet laminated gapped core inductor variation

    Figure of post #7 shows that relative permeability varies a lot with applied field strength (proportional to current). Lower field strenght gives lower permeability giving lower flux density. - - - Updated - - - What does figure of post #7 tell then ? - - - Updated - - -...
  2. C

    Bypass dc signal which is accompanied with a low frequency sinusoidal signal

    Now depends on the settling time you need. For settling time = 0.5 seconds, a 16nF cap and 10 Meg resistor. Do not push too much the settling time, otherwise you will attenuate your AC signal.
  3. C

    [SOLVED] Iron sheet laminated gapped core inductor variation

    How low? I understand that at higher than 0.5T most materials can start to saturate, but using a very low range of magnetic flux density also makes it vary, as you just saw from the above posts... - - - Updated - - - You should specify the lower end of magnetic flux density the inductance does...
  4. C

    parasitic coil capacitance from frequency

    Another way is to apply fast rising edge step voltage and measure the ringing.
  5. C

    [SOLVED] Iron sheet laminated gapped core inductor variation

    Also mine and yes it is dominated by the gap. In fact, that is how I computed it. The inductance variation is due to low excitation value provided by the LCR ( in the mA range). gap length = 0.23 mm Correction: ≈ 3/2 * Rair gap - - - Updated - - - Are you saying that inductance does not vary...
  6. C

    [SOLVED] Iron sheet laminated gapped core inductor variation

    Of course there is a mistake. That was the whole point of this thread. I computed theoretical inductance for high "H" and hence "mu_r", but did not tested it correctly (at few mV RMS, the current is so little that high "mu_r" is not achieved). - - - Updated - - - Yes, I use the constant...
  7. C

    [SOLVED] calculating capacitance of transistor gates

    It includes the gate driver's resistance and transistor's internal resistance as well.
  8. C

    [SOLVED] Iron sheet laminated gapped core inductor variation

    Of course they are not the same. FvM showed typical iron core material to let me see how much the permeability varies with such material, but still not exactly mine (M400-50A). Sure. Or another way is to use "B" (because it easy to compute), go to "B vs H", then to "mu vs H".
  9. C

    [SOLVED] calculating capacitance of transistor gates

    Peak current into gate of transistor is simply V_driver/Rgate. No need for any capacitance value.
  10. C

    [SOLVED] Iron sheet laminated gapped core inductor variation

    Sure. Or assume you are in the high µ_r region and neglect core recultance: Rcore<<Rair gap. Under this assumption, the overall path has a reluctance: Roverall path under above assumption & E+I core geometry ≈ Rair gap That is what I used to design "L". I computed "B" assuming a "L" by design...
  11. C

    [SOLVED] Iron sheet laminated gapped core inductor variation

    Inductance measurement done in the 0.5 T range and does not vary with changes in voltage (maintaining high magnetic density flux). Thank you all for your help.
  12. C

    [SOLVED] calculating capacitance of transistor gates

    The effective input capacitance is calculated as in post #1. You have capacitance curves in the datasheet.
  13. C

    [SOLVED] Iron sheet laminated gapped core inductor variation

    Yes. With very low current, might not get enough magnetic field strength ("H"), hence low mu_R... Next will try variations using high current. - - - Updated - - - You presume correctly. I am in the B_peak=0.012 T range in the central leg and half that in the outer legs... - - - Updated - - -...
  14. C

    [SOLVED] Iron sheet laminated gapped core inductor variation

    Not going to.. sorry, because I know accuracy is affected by voltage applied due to different currents in the connections. Furthermore, I am using the "series measurement test". Not parallel one, as I forgot to mention in the OP. The main problem I think it is due to the core. From...
  15. C

    [SOLVED] Iron sheet laminated gapped core inductor variation

    Hello everyone, I have a gapped (few mm of air gap) inductor wound around the E+I sheets of a laminated core Power Core M400-50A. The problem that I see is that the inductance when measured with an LCR meter varies when the amplitude of the LCR varies. 56mH @50 Hz @ 50mVRMS 50mH @50 Hz @...
See more

Part and Inventory Search

Back
Top