Charlie, Remember that 62368-3 was developed at the direction of
ACOS to move the powered communication interfaces info from the 62368-1 base
standard to a separate document that would be available for use outside of
62368-1. The goal is to move this from the Wild West into an orderly set of
requirements that any product standard can use.
You claim that for the ‘simple circuit’ you mentioned the
limited power is safe as you see it. How does the user know if that simple
solution is implemented in any particular product and that it is safe?
The 62368-3 standard itself seems limiting so the requirements
are being rewritten into 2 new documents which will be more tailored to the two
realms under which these circuits work, <60Vdc and >60Vdc. TC108 has this work
underway.
Whether or not any of this is required is a matter for product
committees to specify and test labs to check.
Whether you want to use the requirements or not come down to
your understanding of the risk associated with the use (and misuse) of products
providing power over these communication interfaces and/or having them
specified in a mother standard.
:>) br, Pete
Peter E Perkins, PE
Principal Product Safety & Regulatory Affairs Consultant
PO Box 1067
Albany, ORe 97321-0413
503/452-1201
IEEE Life Fellow
IEEE PSES 2020 Distinguished Lecturer
<http://www.researchgate.net/Peter%20Perkins> www.researchgate.net search my
name
<mailto:[email protected]> [email protected]
Entropy ain’t what it used to be
From: Charlie Blackham <[email protected]>
Sent: Wednesday, October 20, 2021 10:12 AM
To: [email protected]
Subject: [PSES] IEC 62368-3:2017 evaluation of USB 2.0 ports
All
I realise there are now applications where 100W or more can be transferred, but
for devices with only USB2.0 ports, that are coming from the same chip, is
there really any need for testing and CB certification to this standard as part
of an assessment to IEC 62368-1?
The particular products I’m looking at are powered from external 5V LPS power
supplies that shutdown at around 4.5 A
I may just be being cynical, but I can’t see how the -3 standard makes such a
product any safer, it just seems to make the test lab richer 😊
Is there something in the CB scheme rules that mandates using the -3 standard
as well when seeking CB certificate?
Best regards
Charlie
Charlie Blackham
Sulis Consultants Ltd
Mead House
Longwater Road
Eversley
RG27 0NW
UK
Tel: +44 (0)7946 624317
Email: <mailto:[email protected]> [email protected]
Web: <https://sulisconsultants.com/> https://sulisconsultants.com/
Registered in England and Wales, number 05466247
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