I'm reading a bit on LV lamp dimming. It seems the switchers {"electronic transformers"] that drive 12v Halogens & LED's prefer Reverse-Phase dimmers. I'm not seen much of a write up on such but it appears that they turn on at zero crossing, and turn off mid-cycle. The Vizia VPE06-1L is one.
I wonder what kind of design they use; power FETs or ????
Den fredag den 8. maj 2015 kl. 01.06.17 UTC+2 skrev David Lesher:
probably, I've seen several schematics for dimmers using either back-to-back fets or a fet and a diode bridge
-Lasse
An example:
Klaus
Good question. Some "old" dimmers will work with some new LED lamps. But the situation is a mess: old dimmers with dimmable LED lamps can sometimes start oscillating. And unlike incandescent and halogen bulbs, not all LED lamps are dimmable.
One can get incandescent dimmers for about $4 US. The LED dimmers are > $20 US. And even at that price, all combinations are not guaranteed to work.
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