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Boost converter 36 volts

Discussion in 'General Electronics Discussion' started by JHCJ, Nov 15, 2016.

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  1. JHCJ

    JHCJ

    1
    0
    Nov 15, 2016
    Hi!

    I'm new to electronics and i would like to build a boost converter to power a 20W led. The led requires a voltage of 36 volts. To power the LED i will be using 18650 batteries and a tp4056 charger with discharge protection. Therefore i wish to connect them in parallel. I currently have a simple eBay boost converter which provides up to 40 volts but when i add a load the voltage drops down to 28 volts which isn't enough. I'm therefore looking to build a circuit than can boost 3.7 volt up to 36 volts. Does anyone have any idea of how to do this?

    Right now i'm running 7 batteries in series with a resistor of 42 Ohms. This works but after a while the led gets dimmer due to the voltage drop and the batteries are run unprotected. Would it be better to run them in series and add a protection circuit instead of building a boost converter?
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,481
    2,830
    Jan 21, 2010
    It's easier to have a voltage source higher than the led requires and then to build a constant current source.

    See our resource on LEDs for way more information.
     
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