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Re: [TCML] IGBT variac dimmer?



On 9/17/11 7:33 AM, dave pierson wrote:

As an aside I believe that the humble dimmer switch contains a
thyristor (SCR) so the wave form which it produces is a chopped
version of the mains AC, not a sinusoid of lower magnitude.
     I suspect, more commonly, a triac
     (think: bidirectional SCR.).  The comment on
     chopped/distorted sine is well made.
\

OTOH, a good low pass filter would turn that phase controlled sine into a nice sine..

Considering that you might already have a honkin big inductor (technical term, that) for current limiting, such a LPF might not be a big deal.

You could also do what utilities do for cycloconverters and DC links...

Build tuned filters to suppress the specific harmonics..
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