Re: Electronic dimmer as Variac
From: Frithiof Andreas Jensen (frithiof.jensen_at_diespammerdie.jensen.tdcadsl.dk)
Date: 07/06/04
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Date: Tue, 6 Jul 2004 13:03:16 +0200
"DaveC" <me@privacy.net> skrev i en meddelelse
news:0001HW.BD0EC25600339262F02845B0@news.individual.net...
> Is it feasible?
Likely not, use the light bulb trick instead - I prefer a Toaster in series
mysel just to save the fuses.
A SMPS will, if it is a decent design, have a threshold where the supply
will start - so the first 1/3 of the input voltage range it will be off
anyway and ramping up the voltage does not buy you anything other than
saving a fuse: It will start suddently by itself.
A SMPS is usually a capacitive load, the dimmer is designed for an Ohmic
load i.e. a light bulb, and the TRIAC in the dimmer will not appreciate
piring directly into a capacitor that will look like a dead short. They you
can stick an inductor in series - and you might get at resonant overvoltage
blowing the supply/dimmer away.
IOW: It creates more trouble than the problem you started with.
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