Electronic ballast for fluorescent lamps

Discussion in 'Electronic Design' started by SBS, Feb 5, 2007.

  1. SBS

    SBS Guest

    Hi,
    I am looking for an electronic ballast which
    could drive 8W fluorescent lamp(s) (UVA tube).

    I found some electrical schemes on the web, but
    I wasn't be able to find the suitable transformer.

    Can someone tell me about a good ballast design,
    please?

    Thank you and regards.
     
    SBS, Feb 5, 2007
    #1
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  2. On Mon, 5 Feb 2007 11:11:52 +0100, in sci.electronics.design "SBS"
    <> wrote:

    >Hi,
    > I am looking for an electronic ballast which
    >could drive 8W fluorescent lamp(s) (UVA tube).
    >
    >I found some electrical schemes on the web, but
    >I wasn't be able to find the suitable transformer.
    >
    >Can someone tell me about a good ballast design,
    >please?
    >
    >Thank you and regards.
    >

    You will probably have to have the transformer custom wound, which is
    normally no big deal

    Loads of stuff here
    http://www.irf.com/product-info/lighting/


    martin
     
    martin griffith, Feb 5, 2007
    #2
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  3. "SBS" <> schreef in bericht
    news:45c703b6$0$31680$...
    > Hi,
    > I am looking for an electronic ballast which
    > could drive 8W fluorescent lamp(s) (UVA tube).
    >
    > I found some electrical schemes on the web, but
    > I wasn't be able to find the suitable transformer.
    >
    > Can someone tell me about a good ballast design,
    > please?
    >
    > Thank you and regards.
    >
    >


    You can drive an 8W fluorescent lamp with a simple circuit that requires no
    coil or transformer.
    http://www.repairfaq.org/sam/linefl.gif

    petrus bitbyter
     
    petrus bitbyter, Feb 5, 2007
    #3
  4. SBS

    SBS Guest

    petrus bitbyter () ha scritto:

    ::: I am looking for an electronic ballast which
    ::: could drive 8W fluorescent lamp(s) (UVA tube).

    :: You can drive an 8W fluorescent lamp with a simple
    :: circuit that requires no coil or transformer.
    :: http://www.repairfaq.org/sam/linefl.gif

    Thank you veru much. Is it safe for my fluorescent tubes?

    Regards.
     
    SBS, Feb 5, 2007
    #4
  5. "SBS" <> schreef in bericht
    news:45c72973$0$31670$...
    > petrus bitbyter () ha scritto:
    >
    > ::: I am looking for an electronic ballast which
    > ::: could drive 8W fluorescent lamp(s) (UVA tube).
    >
    > :: You can drive an 8W fluorescent lamp with a simple
    > :: circuit that requires no coil or transformer.
    > :: http://www.repairfaq.org/sam/linefl.gif
    >
    > Thank you veru much. Is it safe for my fluorescent tubes?
    >
    > Regards.
    >
    >



    Guess so. I build one and it works fine. A friend of mine has an inpection
    light with similar circuit. Worked fine as well untill it fell too hard one
    time. (This broke the tube and the enclosure, not the electronics. I checked
    it out by myself.) Some say the lifetime of the tube will decrease. Maybe
    true, but I've had no problems so far. The only drawback is some more
    flicker compared to a conventional ballast, so it may not be a succes as a
    reading lamp. I also experimented with the electronics of a worn out
    electricity-saving lamp. A 8W tube works really fine on the electronics of
    such a 9W lamp. If you google around, you will also find some sites dealing
    with this things.

    petrus bitbyter
     
    petrus bitbyter, Feb 5, 2007
    #5
  6. SBS

    RHRRC Guest

    On 5 Feb, 12:28, "petrus bitbyter"
    <> wrote:
    > "SBS" <> schreef in berichtnews:45c703b6$0$31680$...
    >
    > > Hi,
    > > I am looking for an electronic ballast which
    > > could drive 8W fluorescent lamp(s) (UVA tube).

    >
    > > I found some electrical schemes on the web, but
    > > I wasn't be able to find the suitable transformer.

    >
    > > Can someone tell me about a good ballast design,
    > > please?

    >
    > > Thank you and regards.

    >
    > You can drive an 8W fluorescent lamp with a simple circuit that requires no
    > coil or transformer.http://www.repairfaq.org/sam/linefl.gif
    >


    This circuit looks like a typical 'play around with lots of components
    but ensure you do not know anything about what you are doing' type
    circuit.
    On 220V ac a single series cap will work as a ballast. Since many (but
    not all) 8W T5 tubes's, at room temp, will begin to arc as low as 250V
    - that is all that is needed.
    >From memory the arc is run at around 50V for a T5 8 watt.

    With a capacitive ballast the crest factor is appalling, the cathodes
    will be stripped etc, life and output reduced. That is why it is not
    used.

    Why do you need an 'electronic' ballast?
    What is the advantage of an electronic ballast in your application -
    size, thermals,..... ??
     
    RHRRC, Feb 5, 2007
    #6
  7. SBS

    SBS Guest

    RHRRC () ha scritto:

    :: Why do you need an 'electronic' ballast?
    :: What is the advantage of an electronic ballast in your
    :: application - size, thermals,..... ??

    I need an electronic ballast because I want to reduce
    size and weight of the resulting device I am building.

    Petrus suggested me to use the electronics of an energy
    saving lamp with about same power consumption of
    the fluorescent tube I have to use. Other experience
    with electronic ballast from energy saving lamp?
     
    SBS, Feb 5, 2007
    #7
  8. "RHRRC" <> schreef in bericht
    news:...
    > On 5 Feb, 12:28, "petrus bitbyter"
    > <> wrote:
    >> "SBS" <> schreef in
    >> berichtnews:45c703b6$0$31680$...
    >>
    >> > Hi,
    >> > I am looking for an electronic ballast which
    >> > could drive 8W fluorescent lamp(s) (UVA tube).

    >>
    >> > I found some electrical schemes on the web, but
    >> > I wasn't be able to find the suitable transformer.

    >>
    >> > Can someone tell me about a good ballast design,
    >> > please?

    >>
    >> > Thank you and regards.

    >>
    >> You can drive an 8W fluorescent lamp with a simple circuit that requires
    >> no
    >> coil or transformer.http://www.repairfaq.org/sam/linefl.gif
    >>

    >
    > This circuit looks like a typical 'play around with lots of components
    > but ensure you do not know anything about what you are doing' type
    > circuit.
    > On 220V ac a single series cap will work as a ballast. Since many (but
    > not all) 8W T5 tubes's, at room temp, will begin to arc as low as 250V
    > - that is all that is needed.
    >>From memory the arc is run at around 50V for a T5 8 watt.

    > With a capacitive ballast the crest factor is appalling, the cathodes
    > will be stripped etc, life and output reduced. That is why it is not
    > used.
    >
    > Why do you need an 'electronic' ballast?
    > What is the advantage of an electronic ballast in your application -
    > size, thermals,..... ??
    >
    >


    Well, I neither designed nor analysed the circuit but if you want to...

    A lot of circuits of commercial available electricity-saving lamps can be
    found on:
    http://pavouk.comp.cz/index.html
    That guy Pavouk dissected a lot of them.

    Another experiment:
    http://tacashi.tripod.com/elctrncs/inverter/inverter.htm

    I myself use the electronics of a 20W electricity-saving lamp to drive a
    circline 22W tube. Even works with some older tubes that did not start on
    the original - classic - ballast anymore. (Which was the main reason to drop
    the old ballast. Tubes became useless much too fast.)

    You can buy an electronic ballast as well. Conrad for example sells them:
    http://www1.conrad.de/ (German)
    Look for partnr. 571449 - 89

    petrus bitbyter
     
    petrus bitbyter, Feb 6, 2007
    #8
  9. SBS

    Ian Malcolm Guest

    petrus bitbyter wrote:
    > "SBS" <> schreef in bericht
    > news:45c72973$0$31670$...
    >
    >>petrus bitbyter () ha scritto:
    >>
    >>::: I am looking for an electronic ballast which
    >>::: could drive 8W fluorescent lamp(s) (UVA tube).
    >>
    >>:: You can drive an 8W fluorescent lamp with a simple
    >>:: circuit that requires no coil or transformer.
    >>:: http://www.repairfaq.org/sam/linefl.gif
    >>
    >>Thank you veru much. Is it safe for my fluorescent tubes?
    >>
    >>Regards.
    >>
    >>

    >
    >
    >
    > Guess so. I build one and it works fine. A friend of mine has an inpection
    > light with similar circuit. Worked fine as well untill it fell too hard one
    > time. (This broke the tube and the enclosure, not the electronics. I checked
    > it out by myself.) Some say the lifetime of the tube will decrease. Maybe
    > true, but I've had no problems so far. The only drawback is some more
    > flicker compared to a conventional ballast, so it may not be a succes as a
    > reading lamp. I also experimented with the electronics of a worn out
    > electricity-saving lamp. A 8W tube works really fine on the electronics of
    > such a 9W lamp. If you google around, you will also find some sites dealing
    > with this things.
    >
    > petrus bitbyter
    >
    >

    Been running a normal 8W tube off a ballast from a 9W lamp on our boat
    for the last year. Must have close to 500 hours running time now with no
    problems whatsoever. Its far cheaper than you can build it, even buying
    a decent quality energy saving lamp new.


    --
    Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED)
    ianm[at]the[dash]malcolms[dot]freeserve[dot]co[dot]uk [at]=@, [dash]=- &
    [dot]=.
    *Warning* SPAM TRAP set in header, Use email address in sig. if you must.
     
    Ian Malcolm, Feb 6, 2007
    #9
  10. SBS wrote:
    >
    > Hi,
    > I am looking for an electronic ballast which
    > could drive 8W fluorescent lamp(s) (UVA tube).
    >
    > I found some electrical schemes on the web, but
    > I wasn't be able to find the suitable transformer.
    >
    > Can someone tell me about a good ballast design,
    > please?
    >
    > Thank you and regards.


    Maybe the folks on sci.engr.lighting have some ideas.

    You might want to provide some additional info. like lamp part number,
    supply voltage, etc.

    --
    Paul Hovnanian mailto:p
    ------------------------------------------------------------------
    If God is perfect then why did He create discontinuous functions?
     
    Paul Hovnanian P.E., Feb 7, 2007
    #10
  11. On Tue, 06 Feb 2007 20:27:57 -0800, "Paul Hovnanian P.E."
    <> wrote:

    >SBS wrote:
    >>
    >> Hi,
    >> I am looking for an electronic ballast which
    >> could drive 8W fluorescent lamp(s) (UVA tube).
    >>
    >> I found some electrical schemes on the web, but
    >> I wasn't be able to find the suitable transformer.
    >>
    >> Can someone tell me about a good ballast design,
    >> please?
    >>
    >> Thank you and regards.

    >
    >Maybe the folks on sci.engr.lighting have some ideas.
    >
    >You might want to provide some additional info. like lamp part number,
    >supply voltage, etc.
    >



    As Paul has stated, all 8-watt fluorescent lamps do not have
    the same electrical characteristics. I suspect you have an
    8-watt T5 lamp, which has a diameter of 5/8 inch and a
    length (end of pin to end of pin) of about 12 inches, but
    you may have another lamp with different electrical
    characteristics.

    Your inability to "find" a suitable transformer is not
    unusual. Most ballasts I am aware of use custom
    transformers. The reason for this is that electronic
    ballasts do not operate at a standard frequency and they run
    a great variety of lamp loads. So, usually a standard
    ferrite core is used, but the number of windings and the
    number of turns on each winding, are customized for each
    application.

    There are also many designs that use only a series inductor,
    which is easier to design and build than a transformer.

    You can find designs that use standard magnetics at
    http://www.irf.com/technical-info/refdesigns/lightingkits.html,
    but I don't see any for any 8-watt lamps (but then again, I
    didn't look very hard.)

    --
    Vic Roberts
    http://www.RobertsResearchInc.com
    To reply via e-mail:
    replace xxx with vdr in the Reply to: address
    or use e-mail address listed at the Web site.

    This information is provided for educational purposes only.
    It may not be used in any publication or posted on any Web
    site without written permission.
     
    Victor Roberts, Feb 7, 2007
    #11
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