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Old 29th March 2012, 12:27 PM   #1
AndrewT is offline AndrewT  Scotland
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Default USB charger - how to check?

Hi all.
How do I check a USB charger, before I plug in my expensive equipment?

I have a mains to USB and a 12Vdc to USB pair of chargers.

Which pins are power?
What range of voltage can I expect?
Do I need to draw some current?
How much current?

Can I draw too much current and prevent it switching on?

I am prepared to cut an existing USB cable to expose the wire ends. This can then become the "test" lead.
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Old 29th March 2012, 12:43 PM   #2
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Ok. The USB connector has two power lines, a -0V and a +5V, at the extremes of the flat connector. In between, there are two data signals, data+ and data-, you must not use them. Put a small resistance, about say 22ohm to draw aprox 1/4 amper, and check voltage, 5V. If the voltages is 5V, then the chrgr is OK.

https://www.google.com/search?q=usb+...w=1024&bih=705
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Old 29th March 2012, 12:56 PM   #3
AndrewT is offline AndrewT  Scotland
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Thanks Osvaldo.
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Old 29th March 2012, 01:33 PM   #4
AndrewT is offline AndrewT  Scotland
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4 chargers checked.
3 perfect
wht=0V, org=5V (I don't know if these wire colours are universal in a USB cable). grn & blu must be data by elimination.
1 smelled strongly of burning.

3working chargers, total cost 4.93 from 2 different suppliers, all including postage.
Ebay works sometimes. Let's see if I get a refund for Dead On Arrival from the 3rd supplier.
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Last edited by AndrewT; 29th March 2012 at 01:36 PM.
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