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Topic: Power from 3 USB ports for faster charging? (Read 432 times) previous topic - next topic

tommydog

I have a world travel adaptor which has 4 usb A ports.  Each port is 5v 1.25a.  I want to use these usb ports to charge a battery which has a usb C input.  The USB C input on the battery supports 5v at 3A. I can use a USB A to C charging cable to connect the world travel adapter and battery, however this will only use one port on the travel adaptor, so charging will be limited to 1.25a.  If I want to take advantage of the maximum 3A charging, I will need to utilise 3 of the usb ports. What is the best way of achieving this - is there anything I can buy off the shelf?

MAS3

Hi.

Usually these USB-C ports have some circuitry which enable a non-USB specific charging mode, requiring some kind of communication between the charger and the device to be charged.
So connecting a combination of USB ports and hoping it will work is unlikely to be successful.

Sometimes however, you can do something similar to what you want to achieve.
Some chargers allow a larger current per output, as long as the total available current is respected.
In this case, the cable will be the bottleneck.
I've seen car chargers which are supposed to handle 2.4 A and have 2 USB outputs.
I tested it, and they do offer a nice large current into the testing device's load on each port.
I can't test both ports on the single device.
This would only work if your battery doesn't have a charge management like Qualcomm's QuickCharge technology.
QuickCharge and the likes require support on both ends.
Have a look at "blink without delay".
Did you connect the grounds ?
Je kunt hier ook in het Nederlands terecht: http://arduino.cc/forum/index.php/board,77.0.html

tommydog

Hi.

Usually these USB-C ports have some circuitry which enable a non-USB specific charging mode, requiring some kind of communication between the charger and the device to be charged.
So connecting a combination of USB ports and hoping it will work is unlikely to be successful.

The battery (RAVPower 26800mAh PD Portable Charger) seems to charge fine without any type of communication.  At the moment I am just using a USB A to C cable, and it charges the battery fine. I just want to use more USB ports for greater power transmission.  

The Travel adaptor I have is the Zendure .  The specs below say 4 USB  Type A ports  - 5 V at 5 A Shared.  So I doubt more than 1.25 amp will be possible from each usb port:

https://www.bhphotovideo.com/c/product/1428510-REG/zendure_zdppa_wt_zendure_global_travel_adapter.html


I wonder if something like this would work:  (USB 3.1 Type C USB-C to Dual A Male Extra Power Data Y Cable Cord)
https://www.ebay.co.uk/itm/USB-3-1-Type-C-USB-C-to-Dual-A-Male-Extra-Power-Data-Y-Cable-Cord-for-Cell-Phone/232712537719

I wonder if I could then pair it with something like this to enable me to use 3 of the USB ports:
https://www.ebay.co.uk/itm/Black-USB-3-0-Female-to-Dual-USB-Male-Extra-Power-Data-Y-Extension-Cable-fo-X3A7/173558854035









Paul_KD7HB

Are you also going to modify the internal charging circuit in the RAVPower 26800mAh PD Portable Charger?

Paul

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