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Hi Guys,

I'm looking at ways to further improve the performance and efficiency of
our light sources.

There are always tradeoffs when doing this and I'd like to better
understand what tradeoffs are acceptable for real microscopy users.

Our present illumination sources all use a switched-mode pre-regulation
and a linear final regulation for the LED power, so ripple is very low,
but at a cost for us of some power wasted in the linear stages.

I can improve that efficiency and reduce the waste by foregoing the
linear stage and regulating directly with the switching mode, but the
tradeoffs are a longer On/Off switching time than is feasible with
linear, and a high-frequency ripple.

My simulations suggest switch-on and switch-off times of around 50us and
a ripple of around 25% at 100kHz, which would be reasonable from an
electrical/energy point of view.



The question is, of course, would any of the people likely to use it
find that performance difficult or unacceptable?



I've copied to the list rather than posting direct, so hopefully the
replies will come to me rather than cluttering the list.

Thanks for considering the question, even if you need not, or choose
not, to answer.

Kind regards,
		 Gordon.
 --
 Gordon Scott  Design Engineering
	    Custom Interconnect Ltd.   http://www.cil-uk.co.uk
	    CoolLED                    http://www.coolled.com
	    CoolLED is a division of Custom Interconnect Ltd.
	    Phone +44-1264-321321
	    CIL House, Charlton Road, Andover SP10 3JL, UK


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