USB Chargers





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Thread: USB Chargers

  1. #1
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    Default USB Chargers

    I was going through my 220V USB chargers this afternoon. Most of them are < 1A. Mostly 0.7A and 0.85A. ( @ 5V). I have one 2A charger (it came with a device). The small chargers takes ages to charge.

    Where can I get some more of the 2A chargers?

    What can one expect from the 12V USB chargers? I have one 1A. Is there anything bigger available?

    Lastly..... what is the rated 5V current out on a PC USB ?
    Kobus

  2. #2
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    Default USB Chargers

    I use a 2amp charger at home and work for my Blackberry and a 1amp in the car, the car charger struggled to charge the phone, but when I changed the cable to a thicker one, it works like a charm. The car one and the thicker cable I got from a Pakistani cellphone shop.

    I also saw they have 12v adaptors rated at 2amp that I want to try

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    My previous phone came with a "fast charger" (more than 1A)

    A fast charge would last maybe one day ....


    Slower charge on a standard 12V USB charger (car charger) would leave the phone charged for 2 days .....


    super slow charge from the computer via the USB cable would leave a charge that last 3 to 4 days !!!

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    Quote Originally Posted by ChrisF View Post
    My previous phone came with a "fast charger" (more than 1A)

    A fast charge would last maybe one day ....


    Slower charge on a standard 12V USB charger (car charger) would leave the phone charged for 2 days .....


    super slow charge from the computer via the USB cable would leave a charge that last 3 to 4 days !!!

    What phone do you use? My phone rarely lasts a full day, no matter what charger I use.
    2002 WJ Jeep GC Overland 4.7 V8 - Vetpret
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    Try Scosche reVOLT c2.

    Biggest trick to save your phone battery, after turning off wifi etc, is to turn down your screen brightness. All works on laptops like a charm. Alternatively, get yourself one of those power bricks that are so popular across Asia. Gives you extra juice when you need it, if it is charged.
    Gambit: MY07 D3 TDV6 HSE
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    Quote Originally Posted by SolPlaatje View Post
    Try Scosche reVOLT c2.

    Biggest trick to save your phone battery, after turning off wifi etc, is to turn down your screen brightness. All works on laptops like a charm. Alternatively, get yourself one of those power bricks that are so popular across Asia. Gives you extra juice when you need it, if it is charged.

    My wifi is only enabled when in use. Screen brightness is low but still my phone only lasts till lunch. I recently bought one of those external battery cases. Now my phone lasts a full day with moderate high usage.
    2002 WJ Jeep GC Overland 4.7 V8 - Vetpret
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    Kobus, have a look on bidorbuy. Tons of options available there.
    Just be careful of guys who sell you a bargain, but then rip you off on the shipping costs.
    Make it happen!

    2018 Mobi Lodge

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    Do you have any location services active on your phone? Even a 3G/4G connection van sap your phone more than you think. Whenever I travel and am away from power I even turn the 3G off. Kinda renders a smartphone redundant...
    Gambit: MY07 D3 TDV6 HSE
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  9. #9
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    Methinks one of these would be super-helpful

    http://www.wired.com/2014/04/juno-po...mbid=social_fb
    Gambit: MY07 D3 TDV6 HSE
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    The USB 2.0 spec says 500mA output, but most PC's will supply a bit more than that.

    The yellow USB port on some notebooks is a charging port. They're normally rated for 1A, and they usually supply power when the machine is off.

    The USB 3.0 spec says 900mA, but I've seen ports supplying 1.5A without any trouble.
    [life is what happens when you're notp aying attention]
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    Saw this on eBay

    Kobus

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    This Belkin is one of the better chargers available, I use one for my iPad when I use it as a GPS and it keeps the battery 100% charged. http://www.macnificent.co.za/buy/iph...r-2.1-amp.html
    Cobus
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    Lots of options, saw a wide variety at the Vodacom shop at Vodaworld. Energizer also make some nifty USB chargers.

    Sent from my GT-P7500 using Tapatalk
    ZS6VL


  14. #14
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    I got tired of searching a while back and built my own...
    It supplies 5A per channel.
    This is the first version, but I ended up adding 2 extra regulators and a balancer for a total of 15A.

    [life is what happens when you're notp aying attention]
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    Quote Originally Posted by SytheZN View Post
    I got tired of searching a while back and built my own...
    It supplies 5A per channel.
    This is the first version, but I ended up adding 2 extra regulators and a balancer for a total of 15A.
    I Like !

    Would you part with the recipe ?
    Kobus

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    Suggestion: http://www.hdcabling.co.za/tablet-sm...ries-c-36.html
    seems to have some nice stuff, apart from cellular accessories.

    The prices seem better than Vodashop, etc.

  17. #17
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    Quote Originally Posted by KobusDJ View Post
    I Like !

    Would you part with the recipe ?
    Sure thing!

    I'll have to pull it out of my vehicle and draw up the diagrams again. I'm not sure what I've done with the old ones.

    It's based on the MC34167 switching regulator. The first way I tried to increase the supply current was using mosfets on the output line, but I ended up just using 3 regulators instead because I was getting too much ripple on the output. IIRC it was about 350mV p/p @ 75kHz. I've still got the diagrams for that design if you want to tinker...
    [life is what happens when you're notp aying attention]
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    Quote Originally Posted by KobusDJ View Post
    Saw this on eBay

    I have ordered one of these, expected to arrive this week. Now I must ask. To charge my kindle, or anything else for that matter, which slot do I use? Is there any chance that I will damage the Kindle?

  19. #19
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    @ leervis. My wife is charging her Kindle Fire HD from a 2A (220V) charger. No problem.

    @ SytheZN. Thanks for the offer but don't put in too much effort. I see there are so many good (off the shelf) options out there. I will rather buy something. My skills are in any case not up to standard.
    Last edited by KobusDJ; 2014/04/28 at 05:37 PM.
    Kobus

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    Have a look on whatever you're charging's original charger and see what it's current supply is. Most of the chargers give their power output in milliamperes (1/1000 of an Ampere), so if it says 700mA then it's 0.7A. Using a supply that can give more than the device takes isn't a problem, so if you're charging more than one thing at once then just put the more hungry one on the 2.1A port and the other on the 1A port.

    As for damage, if the charger's output is 4.9-5.1V across the current range then there shouldn't be any problems. Most devices can handle a drop to as low as 4.2V under load, but I wouldn't rely on that.

    The majority of the cheaper supplies I've looked at are fine. The only problems I've seen with some of them is even though their output is 5V nominal they produce noise on the supply which interferes with the touch screens on some of the devices. I haven't seen any permanent damage though.

    Personally, I'd be more worried about over charging than anything else. Plug whatever you're trying in and keep a keen eye on it's temperature while it's charging.
    [life is what happens when you're notp aying attention]
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