SRS circuit

Topics relating to lighting control gear, including magnetic & high frequency ballast and ancilliary devices such as starters, ignitors and switchgear.
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amtrakuk
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SRS circuit

Post by amtrakuk » Wed Aug 27, 2014 7:53 pm

Curious about SRS starting. I camr across this https://upload.wikimedia.org/wikipedia/ ... ircuit.png

Is there a relationship between the two windings or can 2 ballasts be used instead?
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Tom
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Re: SRS circuit

Post by Tom » Thu Aug 28, 2014 9:32 am

The windings of the SRS ballast work in relation to each other, rather like the primary and secondary of a transformer. The main winding is effectively the choke whilst the other half works in conjunction with the capacitor to start the lamp and preheat the cathodes. The windings work together to generate around 600v to start the tube at switch on during the iconic fade in effect!
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amtrakuk
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Re: SRS circuit

Post by amtrakuk » Thu Aug 28, 2014 11:56 am

Hmmm so a ballast and cap inline won't start a tube?
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