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Subject: Re: Looking for 6v fluorescent power supply
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NNTP-Posting-Date: Mon, 16 Dec 2002 19:18:17 EST
Date: Mon, 16 Dec 2002 19:26:02 -0500
On Mon, 16 Dec 2002 23:06:40 -0000, "R. Lewis" =
together some random words that came up with:
>"Stephen H. Westin" wrote in =
>> 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=
>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 =
>without other component alterations to suit..
I'll try changing the capacitor.
My 6 hr calculation was not at the full 9 watts, but at the 350 ma draw I=
seeing from the 6 watt power supply.
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