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From: Mike Poulton
Subject: Re: Ground plane required for fluorescent ballast?
Date: 20 Sep 2002 16:41:35 GMT
Organization: MTP Technologies
On 20 Sep 2002, "tower" <email@example.com> said:
> What is the reason behind electronic fluorescent lamp ballast
> requiring "ground plane"?
Some ballasts (electronic and regular) require a ground plane so the
tube will start. The tube requires quite a high voltage across the ends
to start, and having a grounded object near it reduces this voltage
requirement by providing capacitively coupling the gas in the tube to
ground. That way, it can start ionizing at one end (or both) by
charging the capacitor formed by the tube and ground, thus allowing the
ionization to progress down the tube with less potential than would
normally be required. This is the same basis for the placement of a
trigger electrode on a xenon flash tube.
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