Voltage boost (step-up) newbie question

Discussion in 'General Electronics Chat' started by eimix, Jun 3, 2009.

  1. eimix

    Thread Starter Active Member

    Sep 2, 2008
    32
    0
    Hi

    i'm building RC boat,
    i want to put in more powerfull motor in it. (now i have 27turns, brushded motor) with 24W max power.

    But i have 18V (tested in drill) 14.4V (nominal from factory) motor from drill.
    It is much more powerfull ~200W.
    I use 6cell NiMh (4200mAh) battery pack. This is low voltage for my motor
    Anw - RC boat goes faster this such setup :) I think becouse of - motor keeps constant RPM under load.

    If voltage would be higher - i could get even more speed :)
    Is there any voltage booster (7.2->14.4V) wich could handle high currents ~10A atleast in output?

    My battery and electronic speed controller (ESC) can handle high currents (battery ~30-50A, ESC - 20A continuous, 75A peak current)

    ESC gives PWM output to motor - >10kHz, so i think best place for voltage booster would be between ESC and motor.

    Thanks,
    Eimantas
     
  2. eimix

    Thread Starter Active Member

    Sep 2, 2008
    32
    0
    Please let me know if such voltage boost (doubler) possible?
    7.2V->14.4V
    Iout - 10A
    Load DC motor

    Efficiency >90-95%
    Low weight (<100gr) (1/4 pound)

    Thanks ;)
     
  3. StayatHomeElectronics

    Well-Known Member

    Sep 25, 2008
    864
    40
  4. eimix

    Thread Starter Active Member

    Sep 2, 2008
    32
    0
    Parameters i not perfect, but this device is some sort of i need it.
    Is it possible to get such circuit i could make my self?
     
  5. eimix

    Thread Starter Active Member

    Sep 2, 2008
    32
    0
    I tried to search for such circuit
    And i came up this such idea:

    [​IMG]

    Could this workd?
    On simulator (crococlips) it works, voltage is highly boosted :)
    Is it going to work in real life? :)
     
  6. eimix

    Thread Starter Active Member

    Sep 2, 2008
    32
    0
    Is it possible to build by my self?
     
  7. eimix

    Thread Starter Active Member

    Sep 2, 2008
    32
    0
    I still cannot find answer :(
     
  8. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,170
    395
    Re, page 5, the 1Ω, would about eliminate usefullness. Simplest would be to add more batteries. Doubling V also doubles draw on battery, down to about 10 min run.
     
  9. eimix

    Thread Starter Active Member

    Sep 2, 2008
    32
    0
    1 ohm was added in sumulation only (without it - components are burned in sumulation becouse internal resistance was disabled)

    I know the cosiquences - shorter running time and so on.
    But adding one more battery 400gr (1pound) into boat of totall 1kg (2.5pound) is not a sollution too :(

    I will try to search for other motor.
    Couse doubling voltage in high current - seems to be unsolvable :(
     
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