Author Topic: USB 2A charging requirements  (Read 1268 times)

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Offline drummerdimitriTopic starter

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USB 2A charging requirements
« on: September 25, 2019, 11:10:25 pm »
It is my understanding that most non-fast charging USB phones and devices can charge at a max rate of 2A and 5V from a USB socket.

If that is the case, what are the requirements to get faster than 0.5A charging which is standard on most USB 2.0 devices?

The reason I ask is because I am building my own power bank with 4 non-fast charging outputs but would like the ability to charge a device at its maximum rate will keeping the output voltage 5V.

Currently I am using short (20 cm) 24 AWG wires to wire up the USB plugs and very short and high quality USB cables to charge my Galaxy S10 but I am only able to charge it at around 500 mA when almost empty while a regular 2A USB wall charger could provide it with such current levels.

Is there some kind of handshaking process to allow for faster charging rates that I am not aware of?  :-//
 

Online langwadt

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Offline GromBeestje

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Re: USB 2A charging requirements
« Reply #3 on: December 02, 2019, 06:20:28 pm »
Short the D+ and the D- (the middle pins) in the USB connector on the charger.
 
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Offline drummerdimitriTopic starter

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Re: USB 2A charging requirements
« Reply #4 on: December 02, 2019, 06:38:15 pm »
Short the D+ and the D- (the middle pins) in the USB connector on the charger.

Thanks for that! I am only able to charge at 1A though.

Still not clear how to pull 2A from the port.
 

Offline tooki

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Re: USB 2A charging requirements
« Reply #5 on: December 04, 2019, 12:48:10 pm »
Short the D+ and the D- (the middle pins) in the USB connector on the charger.

Thanks for that! I am only able to charge at 1A though.

Still not clear how to pull 2A from the port.
Then try reading all the replies you’ve gotten.

I checked and this one explains it:
https://electronics.stackexchange.com/questions/177788/how-do-i-design-a-2a-or-more-power-supply-for-my-consumer-usb-devices
 


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