Are these USB port modifications feasible?

Discussion in 'Power Electronics' started by Krazyk, Aug 16, 2019 at 12:18 AM.

  1. Krazyk

    Thread Starter New Member

    Aug 11, 2019
    14
    0
    So I have a small pcb from the inside of a USB charger for a 12v cigarette lighter port. After reading this spec sheet for the IC on the board I am hopeful that with the swapping of some resistors and capacitors the output power to the USB port can be increased considerably. And I mean by a substantial amount. I'm looking for at least 14.4v and 3amp If that is not possible am I at least correct in the assumption that the actual USB receptical itself could actually be taken away from all the components and it would just be a plug? I could say wire a 12v DC power supply to it and use the USB for my connection? I'm out of my league but any help will be greatly appreciated. 2021465901.png Screenshot_20190816-000954~2.png IMG_20190815_232031.jpg IMG_20190816_001106.jpg IMG_20190816_001100.jpg [/ATTACH]
     
  2. LesJones

    Well-Known Member

    Jan 8, 2017
    2,196
    653
    You don't say what evidence suggests that the HC2018 chip can give the higher output voltage and current that you suggest, It is very unlikely that it can work as a boost converter as well as a buck converter. (There are chips that can perform both functions but not with the same circuit configuration.) I do not believe that a chip of that size could handle a current of 3 amps. (I could be wrong as I can't find the data sheet for the HC2018) What is the relevance of the list of triacs and audio amplifiers to your question ?

    Les.
     
  3. Papabravo

    Expert

    Feb 24, 2006
    12,190
    2,681
    USB chargers work with pretty narrowly defined limits. Triacs are not normally used in DC-DC conversion circuits. You need to start with some requirements and a deep understanding of the following principle: POWER OUT WILL ALWAYS BE LESS THAN POWER IN; SOMETIMES IT WILL BE MUCH LESS. Until you can get your head around that, you will continue to flail uselessly.
     
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