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AC control

 
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asjad



Joined: 09 Mar 2004
Posts: 52
Location: Greater Manchester - UK

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AC control
PostPosted: Thu Apr 01, 2004 1:58 pm     Reply with quote
Hi All,

I am trying to control the power delivered to an AC Bulb.

Any advice on how to control the brightness???


I thank you in advance!
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Neutone



Joined: 08 Sep 2003
Posts: 839
Location: Houston

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Re: AC control
PostPosted: Thu Apr 01, 2004 2:32 pm     Reply with quote
asjad wrote:
Hi All,

I am trying to control the power delivered to an AC Bulb.

Any advice on how to control the brightness???


I thank you in advance!


After each AC zero crossing wait a variable amount of time and then turn on an SSR that is in series between the bulb and line power. I believe microchip has aplication notes and even some demo kits available.
mvaraujo



Joined: 20 Feb 2004
Posts: 59
Location: Brazil

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PostPosted: Thu Apr 01, 2004 2:33 pm     Reply with quote
One option is to control the phase angle of a TRIAC device.
asjad



Joined: 09 Mar 2004
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Location: Greater Manchester - UK

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Re: AC control
PostPosted: Thu Apr 01, 2004 3:48 pm     Reply with quote
Neutone wrote:
asjad wrote:
Hi All,

I am trying to control the power delivered to an AC Bulb.

Any advice on how to control the brightness???


I thank you in advance!


After each AC zero crossing wait a variable amount of time and then turn on an SSR that is in series between the bulb and line power. I believe microchip has aplication notes and even some demo kits available.


what is a SSR??
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Neutone



Joined: 08 Sep 2003
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Location: Houston

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Re: AC control
PostPosted: Thu Apr 01, 2004 4:00 pm     Reply with quote
what is a SSR??

It is a solid state relay. A TRIAC or SCR for example.

http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=178245&Row=214251&Site=US
Pete Smith



Joined: 17 Sep 2003
Posts: 55
Location: Chester, UK

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Re: AC control
PostPosted: Fri Apr 02, 2004 3:53 am     Reply with quote
asjad wrote:
Hi All,

I am trying to control the power delivered to an AC Bulb.

Any advice on how to control the brightness???


I thank you in advance!


This has actually been done a couple of times in the last few months here.

Microchip actually have an application note about it too, with some handy ideas (pretty nasty ones, involving connecting a PIC to the mains via 1 1Meg resistor!)

If you do a search on the board for "triac", it lists the topics, and you should get some good ideas.

HTH

Pete.
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