Fast driving of inductive load

Discussion in 'The Projects Forum' started by marius1992, Feb 8, 2016.

  1. marius1992

    Thread Starter New Member

    Feb 8, 2016
    1
    0
    Hi,

    I would like to obtain a stable 100mAp-p current in an inductor (680uH) driven with a sine wave of 20Vp-p between 1-10 MHz.
    Could anyone suggest any ideas for an amplifier/ voltage to current converter design that would allow me to achieve something like this? Any information leading on the wright track would be much appreciated.

    Thanks!
     
  2. DickCappels

    Moderator

    Aug 21, 2008
    2,648
    632
    The circuit on the right-hand side of the schematic below might give you an idea. It is a gated constant current source driving an parallel tuned resonant circuit. The resulting current waveform is a sine wave, providing the resonant circuit has a decent Q.


    [​IMG]
     
  3. #12

    Expert

    Nov 30, 2010
    16,261
    6,768
    I suspect some difficulty in making a tuned resonant circuit over a range from 1 MHz to 10 MHz.
     
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,777
    1,103
    Unless I'm missing something, sadly, it's not going to happen :(. To drive 100mA p-p through 680uH at even 1MHz requires over 400V p-p.
    InductorCurrent.PNG
     
  5. tcmtech

    Well-Known Member

    Nov 4, 2013
    2,034
    1,632
    My books say that at 1 MHZ 680 uH has about 4300 ohms of impedance. :rolleyes:
     
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