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Anyone can help me

D

Daniel

Jan 1, 1970
0
Anyone can help me, im new do things with electronics
I have a light modulate kit built with THYRISTOR´s and wen I try using
light with transformer (normal spots of 30W) they don't work, only
the normal lamp work.
I hear if I use triac, they can work with the lamps with transformer.
Can I simple make the change from thyristors to triac´s
Wish triac´s I can use?
Thanks in advance
Daniel
 
B

Blake

Jan 1, 1970
0
Daniel said:
I have a light modulate kit built with THYRISTOR´s and wen
I try using light with transformer (normal spots of 30W)
they don't work . . .
I hear if I use triac, they can work with the lamps
with transformer

Daniel,

A triac is a thyristor.

It's not obvious to me why your light modulator (dimmer?) doesn't work with
transformer driven lamps. I use light dimmers with transformer operated
battery chargers and incandescant lamps from time to time. They have always
worked for me.

But there is a concern. Power transformers are made to work with sine wave
frequencies of 50/60 hz. After chopping the waveform with a triac, there is
a considerable amount of power in high frequency harmonics. The transformer
will be much less efficient at these high frequencies, and a good share of
your input power goes into heating up the transformer.

The saving grace is that while the efficiency goes down for low duty cycle
settings, the input power is less. Total heating of the transformer doesn't
usually increase. Of course, it depends on many factors, so don't take this
as an absolute rule.
 
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