On Tue, 21 Feb 2012 00:45:00 -0500, "Tom Del Rosso"
wrote:


Jim Thompson wrote:
On Sun, 19 Feb 2012 20:34:28 -0500, "Tom Del Rosso"
wrote:


Jim Thompson wrote:

PWM BOOST is NOT trivial, though I'm well on my way to an
off-the-wall STABLE solution... found by running the math instead
of my mouth.

Off the wall in what way?

In ways I will apply for patent, then explain ;-)

So it's totally wacky then.



Continuous-mode PWM boost is just one baby step past trivial. All you
minimally need to do is limit the ON duty cycle to a modest amount
past what you need to overcome losses, to avoid the 100% ON
singularity. It's been done zillions of times. If a uP is generating
the PWM, you can do a smart algorithm with nice ramp-ups and stable
current limiting.