Dear experts,
What would be the limit of USB output? I know IEC 60950-1 requires only that
it complies with limited power source, but there might be some other
requirements to limit power from USB?
In particular, I am talking about power supply with USB connector. Can it go up
to 5Vd.c./3A?
On Fri, 24 May 2013 17:24:35 +0100,
John Woodgate j...@jmwa.demon.co.uk wrote:
It's known that this clause is inadequate and it will be reviewed, but
probably not very swiftly. It has been pointed out that the
capacitance between the EUT and the ground plane depends on the
permittivity of
Hello Bostjan,
There are a number of considerations regarding power from standard USB ports.
There are USB ports designed to supply power over an additional set of
contacts. I would recommend using one of these connector types where you intend
to deliver more power than normally supplied by a
Brian, et al,
A histerical, er - historical, review...
In an internationally harmonized standard all expected issues must
be considered. The primary driving factor for the cap discharge test on the
power input pins has been driven by the British over the years.
The
In message 34C449781DB0418B8509F64FA4FA3967@Pete97219Compaq, dated
Mon, 27 May 2013, Pete Perkins peperkin...@cs.com writes:
The large, flat British plug seems to follow the 'perversity of
nature' rule and drop 'butter side down' with the pins in the palm of
your hand most of the time -
All,
Regardless of a connector's ampacity, you should always refer to the USB
specification and its limits. I cannot vouch for how much current a
manufacturer may decide to put on the port, but if they exceed the USB
standard, they are outside the spec. Conversely manufacturers sometimes
http://blog.circuitprotection.com/blognews/the-new-usb-charging-specification-increased-user-experience-in-the-world-of-power-hungry-devices/
Curt
-
This message is from the IEEE Product Safety Engineering Society emc-pstc
Nice article.
It begs the question, is this the new de facto standard for powering digital
appliances?
Doug
Douglas E Powell
http://www.linkedin.com/in/dougp01
-Original Message-
From: Curt McNamara mcnam...@umn.edu
Date: Mon, 27 May 2013 12:39:08
To:
The USB specification gives a lower limit, defining the minimum current that
must be available. However, it has no upper limit. In addition, the USB
specification is written to ensure minimum functionality and interoperability.
It does not directly address safety issues. Compliance with the
I've understood from the USB 2.0 spec quoted below the maximum current provided
should be no more than 5A. Has this changed?
I've also noted that it isn't hard to find hubs that allow more than 5A to
individual ports.
Gary Tornquist
Director of Product Safety
MICROSOFT CONFIDENTIAL: This
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