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  1. E

    Multi stranded non-enamelled wire...skin effect?

    it is possible to get too carried away on this or any topic.
  2. E

    Multi stranded non-enamelled wire...skin effect?

    What you are saying is - " a strand of wire has inductance " All copper wire has "skin effect" the tendency for the current to flow in the skin as the freq goes up - thus less area is used to carry current - thus the AC resistance is higher - all due to the way the mag fields act on...
  3. E

    Multi stranded non-enamelled wire...skin effect?

    Actually the stranded wire has a slight twist introduced at manufacture to help it stay together during the coating process ( when one strips the ends one tends to undo any residual twist ) - the grouped individual strands also have more total periphery - i.e. skin - than solid, this...
  4. E

    Multi stranded non-enamelled wire...skin effect?

    That link is concerned with 50/60Hz - where the skin depth is 9cm, it is more about lowering L and increasing C for a transmission line - if you care to read it thoroughly.
  5. E

    SMPS unstable output

    RFI getting into the power source .... look at the Vin at the same time .... also, you have lots of caps on the o/p, but none by the input inductors ?
  6. E

    Multi stranded non-enamelled wire...skin effect?

    .. and since we are talking, in the main, about transformers .... [ p.s. that link is pretty far from convincing ]
  7. E

    IGBT discontinued

    you missed out the "UD"
  8. E

    Multi stranded non-enamelled wire...skin effect?

    paralleled strands, even if insulated, behave the same as solid, this has been shown many times, it is only the periodic edge to centre weave of litz that forces current to flow in all parallel strands ....
  9. E

    IGBT discontinued

    Simply choose a better IGBT. There are 100's to choose from
  10. E

    input capacitance of LM318

    any input capacitance is determined by the Vbe & Vbc capacitance of the xtors in the op-amp - there may be a few in series - cap to gnd may only be of import if one of the op-amp input pins is connected to gnd - else the input cap will mainly consist of strays - e.g. 1 - 2 pF as...
  11. E

    Feedback compensation on the primary or secondary side (SMPS)

    @cupoftea, correct, the only output follower is by linear opto, e.g. IL300
  12. E

    Multi stranded non-enamelled wire...skin effect?

    when you buy real litz from a reputable manufacturer there is a spec for how far along the "wire" it takes for a conductor to travel from the outside to the middle to the outside again, e.g. 1.5" You can check this under a u-scope once on a volume prod line - the losses in a 3kW converter...
  13. E

    Contactless and wire-less power coupling?

    most of these transformers with gap - have a resonant series cap on each side - driven by a (usually ) sine wave source and set up for good resonance matching when the transmitter in is the right place - you can in fact transmit up to 50W pretty easily with this method for air gaps up...
  14. E

    Multi stranded non-enamelled wire...skin effect?

    Yes we are - and you can get away with a lot at 50kHz sine .... most of the current will flow in the "öutside" of the bundle, where, at 7 x 1.2 dia there is plenty of ""skin ... p.s. for safety standards, the PUR doesn't count - as it is easily scratched or nicked, for Litz of...
  15. E

    Multi stranded non-enamelled wire...skin effect?

    insulated wires that are not stranded, woven, like litz, behave the same as solid, simple twisting introduces a slight improvement in Rac, but the MLT is slightly longer ...
  16. E

    problem in Dual Active Bridge(LT-spice implementation)

    it's all LT spice, so yo can look at the fet currents at the edges, as well as Vds
  17. E

    problem in Dual Active Bridge(LT-spice implementation)

    would be good to see some of the zoomed in content.
  18. E

    problem in Dual Active Bridge(LT-spice implementation)

    looking at the waveforms - you already have it - try zooming in on the edges ... 1623275598 Just a note - the rail voltage do not match the device ratings - you should correct that either by different devices or by scaling the input bus etc
  19. E

    Dividing down the mains efficiently

    Let us know how it goes - driving the high side switch from 0- 100% pwm can be a small issue - also protection from mains spikes - pk current mode a good idea - but you could get away with fixed pwm too - as it is very nearly a linear system ( with a pk curr mode limit ). 1200V 65...

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