E cigarette contradiction

Discussion in 'General Electronics Chat' started by michaellatini, Sep 2, 2014.

  1. michaellatini

    Thread Starter New Member

    Sep 2, 2014
    3
    0
    Hello all, I am new to the group and first time posting. I have an electronic cigarette, called, Itaste VTR that allows you to set either the voltage or the wattage. It states in the owners manual that you may set the wattage to a maximum of 15.0 watts. You may set the voltage to 6.0 volts. You may use an e cig coil between 1.2 to 3.0 ohms.

    From what I know a 1.2 ohm coil set to 6.0 volts would be 30 watts drawn. I have checked the output voltage without a load and it does put out 6.0 volts.

    Am I missing something in my interpretation of the manual?

    Thanks in advance for any info.

    Michael Latini
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,093
    3,030
    I think a measurement without a load is probably not relevant for many circuits. Hard to tell without a schematic.

    The manual is probably correct that your proposed settings at 30W would not be supported. I would say the power rating trumps all others, and that you are free to use any volts, ohms combination that does not exceed 15W.
     
  3. Brownout

    Well-Known Member

    Jan 10, 2012
    2,375
    998
    Perhaps the maximum wattage control limits 6.0V current to 2.5A.
     
  4. MagicMatt

    Member

    Sep 30, 2013
    117
    14
    Batteries have an internal resistance that limits the amount of current they can put out. I would think if you were trying to drive a 1.2ohm load, the voltage drop from the cell(s) is going to pull it down significantly from 6V, maybe to nearer 3V... you need to measure the voltage under load really.
     
  5. GopherT

    AAC Fanatic!

    Nov 23, 2012
    5,991
    3,736
    Lithium batteries (as used in eCigarettes) can easily support the 1.2 ohm load without dropping that low. It only needs to pulse on for 2 to 3 seconds a few times per minute while the user inhales.
     
  6. michaellatini

    Thread Starter New Member

    Sep 2, 2014
    3
    0
    Thank you to all for your input.

    Michael
     
  7. ian field

    Distinguished Member

    Oct 27, 2012
    4,413
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    Usually I use my homebrew 18350 battery and the lowest resistance heads I can get, recently I bought a KIK ego with 650mAh battery so I have an emergency spare - that battery only lasts a couple of hours of intermittent use, it starts off pretty sharp but doesn't take long to start drooping very noticeably.

    My set up is single cell (3.7V) into 1.8 Ohms - 6V into a similar resistance must be pretty hard core kit.
     
  8. michaellatini

    Thread Starter New Member

    Sep 2, 2014
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    0
    Yes 6 volts would knock me down! I was just wondering at the time of the original question if I was understanding the owners manual? :)
     
  9. ian field

    Distinguished Member

    Oct 27, 2012
    4,413
    782
    With a power control; the unit could well have switch mode technology - maybe even as fancy as a buck-boost converter.

    Even with just a basic boost converter, a 3.7V battery can be used to generate 6V or more.
     
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