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garg29
Joined: 17 Nov 2004
Posts: 277
Helped: 3
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 24 Jan 2008 4:56 Controlling light intensity |
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Hi,
I need to control light intesity of sodium street lights. There are 40 such sodium bulbs conneted in parallel (& can be more) & i think each rates 250W. should i use TRIAC method to control the intensity? I think either i'll need heavy current rating Triac (which one can i use?) or else i'll need to put Triacs in parallel????? which one is possible?? & is better? I refered to http://www.edaboard.com/ftopic238040.html
Thanks in advance,
ragards,
Garg
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Sinisa
Joined: 03 Mar 2003
Posts: 302
Helped: 60
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| 24 Jan 2008 6:02 Re: Controlling light intensity |
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| This is not simple task and triac will not do. Find company that makes dimmable ballasts and buy it. If you are still into making something yourself, you should research how HPS lamp works, electronic balasts and what is involved in designing one. Buying one will save you awfully lot of time and headache.
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manish12
Joined: 21 Nov 2006
Posts: 956
Helped: 29
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| 24 Jan 2008 7:08 Re: Controlling light intensity |
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fan dimmer will work .
250w : if 230v then i ~ 1.X amp
so I total = i x 40 = 40~60 amp
you can get it , such current ratting triacs !
or make a group of 10 , 10 , 10 & 10 it will also work , keep firing ckt common or cascaded.
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rokibulalam
Joined: 07 Jan 2008
Posts: 12
Location: Bangladesh
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| 11 Feb 2008 8:19 Re: Controlling light intensity |
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| garg29 wrote: |
Hi,
I need to control light intesity of sodium street lights. There are 40 such sodium bulbs conneted in parallel (& can be more) & i think each rates 250W. should i use TRIAC method to control the intensity? I think either i'll need heavy current rating Triac (which one can i use?) or else i'll need to put Triacs in parallel????? which one is possible?? & is better? I refered to http://www.edaboard.com/ftopic238040.html
Thanks in advance,
ragards,
Garg |
u can simply use a fan dimmer
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FvM
Joined: 22 Jan 2008
Posts: 2686
Helped: 439
Location: Bochum, Germany
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| 11 Feb 2008 9:37 Re: Controlling light intensity |
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| Quote: |
| u can simply use a fan dimmer |
How do you know? Did you try?
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ossama22
Joined: 04 Nov 2007
Posts: 9
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| 14 Feb 2008 12:37 Re: Controlling light intensity |
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| garg29 wrote: |
Hi,
I need to control light intesity of sodium street lights. There are 40 such sodium bulbs conneted in parallel (& can be more) & i think each rates 250W. should i use TRIAC method to control the intensity? I think either i'll need heavy current rating Triac (which one can i use?) or else i'll need to put Triacs in parallel????? which one is possible?? & is better? I refered to http://www.edaboard.com/ftopic238040.html
Thanks in advance,
ragards,
Garg |
The electronic ballast of a theatrical lighting system is possibly what you need to look at, it provides a current controlled continuous square wave to the lamp. It is used for HMI lamps but the idea itself can be applied to the sodium lamp. I do not think you will get adequate results from triac phase triggering with discharge lamps. See the ballast section in the web page below:
http://en.wikipedia.org/wiki/Hydrargyrum_medium-arc_iodide
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rvionics
Joined: 22 May 2005
Posts: 41
Helped: 4
Location: India
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| 17 Feb 2008 16:59 Re: Controlling light intensity |
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 I think it is not possible to use Triac based designs Since the Sodium vapour lamps have complex electrical characteristics. You can probabely do it by using Switch mode technology based Ballast.
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naveen223
Joined: 05 May 2008
Posts: 8
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| 05 May 2008 15:04 Controlling light intensity |
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hi
u can use tis link to find required icswww.semicon.toshiba.co.jp
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