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Inductive Balanse, PWM sine and Coil

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  • Inductive Balanse, PWM sine and Coil

    I can PWM (pulse width modulation) create sine frequency's (Base:12.5 kHz, PWM period:100kHz)

    How to choice and calculate IB Coil and coil filter to get best parameters for the transmitter...

  • #2
    Originally posted by TheWizard View Post
    I can PWM (pulse width modulation) create sine frequency's (Base:12.5 kHz, PWM period:100kHz)

    How to choice and calculate IB Coil and coil filter to get best parameters for the transmitter...
    Hi,
    why don't use R/2R ladder for this ? I will do this way... using some op amp to get more output current there...

    Higher Q means you will radiate more energy there... you need a near-to resonant tank I think... but not resonant, of course, to avoid well known problems. I don't see that difficault if you can already create a sinus wave using PWM.

    One question: Cannot you use square signal to drive (using some transistor power stage) directly the LC tank ?

    Kind regards,
    Max

    Comment


    • #3
      I am "barefoot" with LC circuits...

      One question: Cannot you use square signal to drive (using some transistor power stage) directly the LC tank ?
      Maybe will test later and is easy to change PWM with square.
      I see (in google) serial resonanse (LC) and square for VCC +5v output by coil is 150-300V

      why don't use R/2R ladder for this ?
      With PWM, I save CPU time for other calculations and PWM is easy for driver amplification

      Attachment is signal filtered only with RC...
      Attached Files

      Comment


      • #4
        Originally posted by Max View Post
        One question: Cannot you use square signal to drive (using some transistor power stage) directly the LC tank ?

        Kind regards,
        Max
        I seem to remember that Ivconic had a nice simple circuit to do this, and you could adjust the frequency.

        Comment


        • #5
          Attachment:
          MOSFET Full-Bridge Driver(~1$)
          Coil (unknow) not tuned for resonanse...
          First harmonics at -40dB,
          Sample Rate harmonics at -72dB
          (soundcard records and graphic)

          Now the question is: Parallel or Serial resonanse?
          Attached Files

          Comment

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