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Sci.Electronics.Basics -> AC signal across 12V (DC) halogen bulbs?
There are 2 messages in this thread.
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Author: allanlewisDate: 10:23 28-04-08
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Hi,
I have a lighting controller circuit using an H-bridge, which produces
a 250Hz signal across a pair of 12V halogen bulbs. (The duty cycle is
controller by a microcontroller, but this is irrelevant to my
question.)
My question is: is a 250Hz signal with rise/fall times <100us damaging
to the bulbs? If so, what can I do to remedy this? I've tried an LC
filter (10-100uH, 100-1000uF) and this gives rise/fall times of
~500us. Is there any value in doing this, or is there something else I
should do to prolong the life of the bulbs?
Thanks,
Allan Lewis.
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Author: Wiebe CazemierDate: 19:48 01-05-08
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On Monday 28 April 2008 16:23, allanlewis wrote:
> Hi,
>
> I have a lighting controller circuit using an H-bridge, which produces
> a 250Hz signal across a pair of 12V halogen bulbs. (The duty cycle is
> controller by a microcontroller, but this is irrelevant to my
> question.)
>
> My question is: is a 250Hz signal with rise/fall times <100us damaging
> to the bulbs? If so, what can I do to remedy this? I've tried an LC
> filter (10-100uH, 100-1000uF) and this gives rise/fall times of
> ~500us. Is there any value in doing this, or is there something else I
> should do to prolong the life of the bulbs?
>
> Thanks,
> Allan Lewis.
I think if the temperature of the filament remains constant, there is no extra
wear on it. Meaning, as long as it doesn't flicker, there is no problem.
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