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Upgrading amps of a circuit to 12A

Discussion in 'General Electronics Discussion' started by RafBR, Jun 23, 2012.

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  1. RafBR

    RafBR

    1
    0
    Jun 23, 2012
    Hi,
    I did motorize my kid's electric car with a 12v wiper motor that burns out any fuse lower than 12A because of it's high current at start. I think it's running amperage is about 6A.

    I found this great circuit that fits almost exactly in what I want, except that it have a bit weak output amperage.
    here is the circuit:
    http://www.soloelectronica.net/dcdc_12v_a_18v.htm

    I think this is also great because of the potentiometer for the output current that will be very useful.
    If anyone with such knowledge in electronics could help me to replace a few components that help rising the output power would be perfect!!!
    I also know that for this high current I should enlarge the pcb traces and place loads of solder on it.

    best regards!
     
  2. davenn

    davenn Moderator

    13,765
    1,920
    Sep 5, 2009
    Hi RafBR
    welcome to the forums :)

    well if its blowing 12A fuses on startup then a 5A supply as you linked to isnt going to be anywhere near enough, is it ?
    regardless of the current drawn under normal running conditions of the motor, you need a PSU that handle the high start up current

    cheers
    Dave
     
  3. Rleo6965

    Rleo6965

    585
    9
    Jan 22, 2012
    Have you tried reducing first the dc voltage and the electric car Starting mode. Once car have momentum then switch to +12V.
     
  4. ohfour

    ohfour

    12
    0
    May 27, 2012
    I don't think reducing the DC voltage will do any good. It will just make the motor more likely to stall and then you really will have a short circuit.
     
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