Linked Questions

0
votes
2answers
1k views

USB charger - tell the phone it can draw more power [duplicate]

I have 8A 6port usb charger. It has two ports marked as fast charing, and the phone here actually charges faster than in the two other ports. When I dismantled it, all the USBs were on the same power ...
0
votes
1answer
713 views

Make 'smart' USB Dedicated Charging Port [duplicate]

I would like to create a circuit that is able to charge any USB connected device from my 5V rail with 1A current limit. There are many different USB devices, asking different kinds of currents, so: 1)...
0
votes
0answers
55 views

Minimum current to charge a 5v device? [duplicate]

I'm trying to use a DC-DC converter to charge a mobile phone. This is the converter....TRACO 12v-5v converter The converter is relatively low power, (5w) and can supply a maximum of 1amp. Testing ...
8
votes
7answers
37k views

How do I design a 2A or more power supply for my consumer USB devices?

I understand that many of my consumer devices charged by USB ports can charge at higher rates than 0.5A. However, in testing, I've found they don't consume more than this. Test Setup I have a power ...
1
vote
6answers
3k views

Split 5V 3A into 1A in 2A to make USB charging device [duplicate]

Overall goal: make a couple USB phone & tablet charging ports from a 12V deep cycle battery. Steps taken so far: I've read that using a resistor based system to step down from 12V to 5V leads to ...
0
votes
1answer
1k views

Floating D+ and D- on a USB Charger

currently I have a problem with an USB Charging Plug (from china). There are some designs, where the D+ and D- line is shorted together, in other there are held to 2.7V. On my plug on the table, ...
0
votes
2answers
567 views

Power-only USB connection to charge my phone - as simple as cutting the data lines?

In a pinch I bought a $3 "phone recharger" from the bin shown below, but now I am too scared to connect it directly to my phone, which costs orders of magnitude more. While a poor design could present ...
0
votes
2answers
147 views

Bus-powered non-USB device (like fan,lamp) USB pin arrangement to getting highest power from USB host

Bus powered means device that only use Vbus of USB for it's power supply. I want to use micro USB as my board power supply. The is designed to take 600mA by 3.3v regulator. But I just don't know how ...
1
vote
0answers
137 views

How to force USB device to drain 500mA Current for charging?

I designed an AC-DC converter circuit(220VAC to 5VDC@700mA) to create a smart phone USB charger. The Transformer that I used in my design can supply only 700mA current. I searched the Web and ...
0
votes
1answer
101 views

Why would a regular converter not be able to charge iPhone and Samsung? [closed]

I was looking around for a step down converter for a home robotics project, when I bumped into this one (image below). In the description it says Can not charge iPhone and Samsung cellphones; But ...
0
votes
0answers
25 views

USB wall charger current question [duplicate]

I have a USB wall charger with this text on it: INPUT: 100-240V 50/60Hz 0.5A OUTPUT: 5.2VDC 2.0A 10.4W I'm building a circuit I want to power via USB and I calculated it would sink 500mA from ...