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From: "R. Lewis"
Subject: Re: Looking for 6v fluorescent power supply
Date: Mon, 16 Dec 2002 23:06:40 -0000
Organization: Nextra UK
NNTP-Posting-Date: Mon, 16 Dec 2002 23:06:36 +0000 (UTC)
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
"Stephen H. Westin" wrote in message
> Steve writes:
> > Thanks.
> > Actually, I am building a highly portable short-wave UV lamp using a
> > PL-S9W/TUV (9 W U-shaped CFL) germicidal lamp. I have cannibalized
> > a 4W and 6W fluorescent lantern and both ballasts will drive this
> > tube, but not at 9 W. The 4 watt ballast drives it at 1.8 W (300 ma
> > @ 6V) which is the current draw when using a 4 W tube, and the 6
> > watt ballast drives it at 2.1 W (350 ma @ 6V) which is the current
> > draw when using a 6W tube. This seems fine for my application, but
> > I would want to drive the tube somewhat harder, hence the desire for
> > a commercial ballast.
> > As to the AA cells, I really want the portability, and anything
> > larger would be much heavier and bulkier. I would like this lamp to
> > fit in my pocket. This lamp won't be used continuously. However,
> > surprisingly enough, AA cells have quite a bit of capacity. From
> > Energizer's web site, the Eveready AA Alkaline cells have a capacity
> > of 2707 ma-hr. Using AA cells, I could probably get 4-6 hours on a
> > set of batteries before the voltage falls below the firing voltage
> > of the ballast.
Something is wrong with your sums here 6hrs at 9W at 90% efficiency with 4
alkaline type cells with require approx 12aH.
To up the wattage of your 6 W inverter if you look closely there will
probably be a high(ish) voltage cap on the output of the inverter
transformer between it and the tube.
Reduce the impedance of this cap to increase the power output.
Be careful as this will prob. not work over a too big an output power change
without other component alterations to suit..
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