So, if I understnd you correctly, simply make DC from the line and since it
will be more than 120V, limit the max pwm output to equal 90V.........is
that what you mean?
Certainly sounds inexpensive.
I'll have to see how much resolution this will take away....

>  From 120VAC? FW bridge with appropriate fusing and surge
> suppression and
> EMI filtering, followed by a BFC filter. Limit the duty cycle
> of your PWM
> to less than about 55 or 60%. Optically isolate the PIC
> (presumably, eh?)
> controller and power it from a separate transformer power
> supply if possible.

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