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High-frequency power sine wave generation

Discussion in 'Electronic Basics' started by Don Gilmore, Sep 2, 2012.

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  1. Don Gilmore

    Don Gilmore Guest


    I'm working on an application where I need to drive a small transformer with high frequency AC power (like around 20 kHz) at about 24 volts or so. My power comes from a 120/24 transformer. In the embedded circuit is an Atmel microcontroller which can produce a 20 kHz, 5V square wave. I need the little transformer to deliver about 4 VA.

    Is there an easy way to do this? I have thought about filtering the MCU square wave to a sine and then amplifying it with an audio amp, but they are pricey and I have a lot of little transformers to drive. I have also thought about feeding to a BJT as a single-transistor amplifier.

    Are there other better ways of doing this?

    Kansas City
  2. Jon Kirwan

    Jon Kirwan Guest

    I guess capable women won't be responding. ;)
    You haven't actually described a way to do it yet. So it is
    hard to say much about other ways.

    It sounds as though you have one microcontroller with I/O
    pins to spare, a lot of small transformers, a single 24VAC
    transformer output at (likely) 60Hz, something that generates
    DC from that and provides the small DC voltages needed by the
    Atmel microcontroller, and you need to use the Atmel to chop
    up the 60Hz 24VAC into 20kHz 24VAC that you will then feed to
    lots (unknown number) of small transformers, each of which
    need to deliver about 4 watts into a load. There is currently
    no information on your 24VAC transformer and no exact count
    or detailed information on the tiny transformers.

    Is that about it?

  3. Nah, I always figure that at some point 'guys' refers to everyone in
    the group,
    no matter their gender. It's like 'men' in the constitution, means
    both men and women.
    (at least since the 19th amendment)

    Hi Jon, just yanking your chain.

    George H.
  4. Guest

    Just like "There's a man-eating tiger in the street!" and so women should feel just fine wandering out there... =)
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