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What is the difference ?

Discussion in 'Electronic Basics' started by [email protected], Sep 18, 2005.

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  1. Guest

    Hi Good morning to group member.Can any member help me. I brough
    a hobby kit to build a 20 watts flourescent light by car battery,
    it turn on the light immediately when power is connected. But compared
    to those energy saving light bulbs(actually is also with
    flourescent tube inside the bulb)it only turn on slowly when power is
    connected.I don't understand what is the different as both also driven
    by electronic circuits,won't you thing the hobby kit is simple &
    efficiency to turn the flourescent on ? thanks in advance.
    Best Regards
    Hoong
     
  2. arem_29

    arem_29 Guest

    hello there!.. i hope ur doin fine.. im Ryan!.. well, regarding your
    problem.. this link might help u.. try checkin this link,
    http://www.tpub.com/electronics.htm
    the link provide electronic infos!... i hope it helps!...
     
  3. arem_29

    arem_29 Guest

  4. arem_29

    arem_29 Guest

  5. dohi

    dohi Guest

    Hi, Hoong,

    You've built an inverter circuit. This sort of circuit makes 200 volts or
    higher / some kHz AC from 12V DC.
    Those voltage and freq can light fluorescent light directly.
    Energy saving light bulb has inverter circuit in it. That makes those
    volt./freq. from 100-220V / 50-60Hz AC.
    Then using energy saving bulb with your circuit is abnormal. It causes
    damage both of bulb and your circuit.
    Good Luck

    dohi
    from Tokyo
     
  6. andy

    andy Guest

    he's lying - it's just a spam site with nothing to do with electronics.
     
  7. Guest

    Thanks all for the information. Hi Dohi it seem that using higher KHz
    can light
    the flourescent tube, but what is the best Hz & voltage,does that mean
    higher
    is better & brighter ?
     
  8. mowhoong

    mowhoong Guest

    Thanks all for the information. Hi Dohi it seem that using higher KHz
    can light
    the flourescent tube, but what is the best Hz & voltage,does that
    mean
    higher
    is better & brighter ?
     
  9. dohi

    dohi Guest

    -------snip-------

    Hi, Hoong,

    Using higher freq. than 50/60Hz is needed not for lighting, but for
    preventing flicker.
    Flicker is not good for your eyes. This is the purpose of the inverter
    fluorescent light.
    And higher freq. reduces the size of transformer in the inverter circuit.
    Fluorescent tube can be lit even by DC if supplying voltage is high enough.
    (Actually lighting by DC may cause some problem, but I'm not sure in it.)

    Fluorescent tube is a sort of discharge tube.
    It's not a conductive device then it doesn't go with Ohm's law.
    When the supplying voltage is lower than a voltage, (discharge voltage)
    the load current is ZERO.
    Increase voltage over discharge voltage, increase load current drastically.
    (and bomb!)
    Inverter circuit for fluorescent tube develops some hundreds volts
    when it's not connected to the tube. (voltage without load)
    When it's connected to the tube and load current flows,
    the inverter circuit drops the output voltage.
    Then, if your inverter circuit has enough power,
    your fluorescent tube lights brightest within the safety condition, I
    think...

    Any way, once the discharge current flows, the discharge voltage is
    decreased, so the actual relation of load current and voltage is
    much complex than my description.
    I don't know the exact value of discharge voltage of fluorescent tube.

    dohi
     
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