Voltage boost (step-up) newbie question

Thread Starter

eimix

Joined Sep 2, 2008
32
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
 

Thread Starter

eimix

Joined Sep 2, 2008
32
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 ;)
 

Thread Starter

eimix

Joined Sep 2, 2008
32
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?
 

Thread Starter

eimix

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



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

Bernard

Joined Aug 7, 2008
5,520
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.
 

Thread Starter

eimix

Joined Sep 2, 2008
32
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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