Controlling the heater by switching complete half-cycles does sound like
the way to go for this situation.  That hadn't occurred to me so that in
itself is a big help.

Bob, if I understand what you are saying, the Bresenham/Phase accumulator
algorithm will somehow determine a sequence of half-cycles to skip that
gives you a reasonable range of power control with a more evenly
distributed half-cycles over some period.  Could you provide just a little
more detail in implementing this, or point me in the right direction.  I
have heard of Bresenham in reference to line drawing and don't see the
immediate connection.

thanks

Bob Bullock

At 10:21 AM 10/15/2002 -0400, you wrote:

>and now Bob Ammerman rebuts:
>
>Assuming you are switching on half cycles, the Bresenham/Phase accumulator
>approach will more evenly spready out the on/off cycles. Given any output
>power the Bresenham will always do at least as well as conventional PWM at
>spreading the on-time around.
>
>Bob Ammerman
>RAm Systems
>
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