Hi Ray,

Give me a few more days to test the concept and I should be able to
demonstrate a fairly efficient inverter circuit.  A simulation using
Microsoft C and Excel to plot it looks really good.  PIC 16F87x series
will do the job.  The code will be written for MPC but hand compiling
into assembler if that's your flavour of choice would be fine too.

Cheers,

John Dammeyer


Wireless CAN with the CANRF module now available.
http://www.autoartisans.com/products
Automation Artisans Inc.
Ph. 1 250 544 4950


> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Ray Gallant
> Sent: Saturday, February 15, 2003 12:01 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE]: Inverter DC-AC
>
>
> I would like to build a mostly sinusoidal power inverter for
> my home forced air heating system now PIC controlled. The
> application is similar to a UPS where the load is an 115VAC
> motor and a few other small 115VAC loads. Available DC source
> will be 1 or more 12 volts batteries similar to a car or
> marine high duty for now. A PIC is involved for LCD, keypad,
> Mains AC monitor, alarm, RS232 and other application but not
> directly for the inverter yet. At this point, I have
> developed a sinusoidal 24VAC p-p 60Hz with zero DC offset
> from a matched pair of transistors (push/pull) and an ICL IC.
> Things OK up to here! Now I need to increase this to 115VAC
> at about 5 amps or more for a while. I was looking at a
> Powerex transistor http://www.pwrx.com/pwrx/docs/kd224503.pdf
>   Should I use a 24:115 transformer and amplify from there? I
> have difficulty with the power stage, snubber and such. I
> have large thyristors available if required. Any feedback is
> much appreciated. Thanks {slewrate}
>
>
>
>
>
>
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