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High-frequency power sine wave generation

Guys:

I'm working on an application where I need to drive a small transformer wit= h 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 lit= tle transformer to deliver about 4 VA.

Is there an easy way to do this? I have thought about filtering the MCU sq= uare 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 though= t about feeding to a BJT as a single-transistor amplifier.

Are there other better ways of doing this?

Don Kansas City

Reply to
Don Gilmore
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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?

Jon

Reply to
Jon Kirwan

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.

Reply to
George Herold

Just like "There's a man-eating tiger in the street!" and so women should f= eel just fine wandering out there... =3D)

Reply to
mrdarrett

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