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Coupled Toroidal Chokes

Discussion in 'Electronic Design' started by Syd Rumpo, Sep 28, 2012.

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  1. Syd Rumpo

    Syd Rumpo Guest

    I want to put some modulation onto a DC power line.

    I used a suitably rated COTS toroidal DC choke and was going to hand
    wind another winding to introduce the modulation. But that was tedious
    given the number of turns I'd need for a reasonable ratio.

    Instead, I took another similar toroid and wound some wire through both
    cores, several turns and connected the two ends. Viola, a large fiddle.

    It works, well enough, but how to analyse or simulate this? How many
    turns? It seems to stop mattering after a few, but I'm not sure how to
    do the maths on this. What are the pitfalls?

  2. Syd Rumpo

    Syd Rumpo Guest

    Thanks, that's clarified things a bit. It's much easier to wind 25
    turns through two toroids than about 200 through one! Also the
    isolation is better having more layers of insulation to get through.

    Driving at a low impedance doesn't fit with the rest of the circuit,
    unless of course I used a transformer...

  3. josephkk

    josephkk Guest

    It almost sounds like you want a telephone hybrid. Bi-directional voice
    (and faster for some applications) in the presence of DC and ringing


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