Somebody said:
> > >Even better, why not screw the phase angle and switch in (or not)
> complete
> > >power line cycles?  At 60Hz that gives you 13 different power choices
and
> > >still drive the heater with at least 5Hz to reduce stress.

Bob Ammerman commented:
> > This would be yet another good application of a Bresenham or phase
> > accumulator algorithm.

Olin added:
> Yes, that kind of algorithm would allow much finer control over the
average
> heat output.  However, it would also lower the fundamental frequency of
the
> input.

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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