> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Harold Hallikainen
> Sent: 23 November 2009 16:14
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE]Good deals on DC AC inverters.
> 
> These are interesting products, and I'm always amazed at how low cost
a
> consumer product can be. I think these typically have a flyback
converter
> that converts the 12VDC to +/-170VDC. They then have an H-bridge that
> switches the +/-170VDC out at 60Hz. A rectangular waveform is used
with
> the duty cycle set so the RMS is 120VAC and the peak voltage is 170V.
> Doing all that for $17 is quite a trick!
> 
> Harold

Many now use the so-called "modified sine" which is just a three level
waveform (+v, 0v and -v).  This gives better compatibility with
equipment that barfs on a simple rectangular waveform (i.e. almost
anything with a transformer).

Regards

Mike


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