[sdiy] 12VDC to 12VAC converter [OT]

[ASSI]

On Montag 03 September 2007, Seb Francis wrote:
> I need to produce a 12VAC 20VA 50Hz supply from a 12VDC input.  It's
> to run a 12VAC motor from a car battery, so the AC voltage doesn't
> have to be particularly sine-like or regulated.

Look for a PWM driver for appliance motors, preferrably with an 
integrated H-bridge and just feed it an unmodulated 50Hz (or whatever 
is close enough) signal.  Rolling your own is entirely possible at 
roughly 2A, but then you have to deal by yourself with controlling the 
dead-time during the switching event and with the reactance from the 
motor coils.  If you do roll your own controllers, there are ready-made 
H-bridge or half-bridge IC, both bipolar or MOSFET and with or without 
the driver circuitry from many companies.  Just the bridge drivers are 
available seperately, too.  There's a stub entry on Whackypedia that 
has a few external links that may be helpful:

http://en.wikipedia.org/wiki/H-bridge

Google brings a lot of useful links on that topic as well.


Achim.
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