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Driving a LED with charge pumps

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jhonn

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I want to power a 50W LED using some 18650 li-ion batteries.The LED needs 33v, so, i've been thinking if i could use charge pumps to step up the voltage from 7.4v (two cells in series) to 33v, and then use a filter capacitor and a voltage regulator to reduce ripple.I know those pumps output small current, but what if i put 2 or 3 of them in parallel ?Any suggestions will be appreciated.


P.S.: i have no access to transformers.
 

rajakumarn

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Even though the parallel combination might work but the battery drain too fast and lasts no longer.
 

BradtheRad

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To get 50W from your 7.4V battery bank, you must draw 7 amps continuous.

It would require several stages of voltage multipliers to step 7V up to 33V, and you would only get maybe 300mA.
 

tpetar

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50W at 33V is too much for low voltage batteries. You will have bad efficiency and big loss in this voltage convertion.
 

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