On 26-Oct-15 6:29 PM, Scott Aldous wrote:
_Table 5 (Capacitor Energy)_
For the energy from a capacitor, the table takes into account
capacitance and voltage, so both need to be taken into account since
the equation for available energy from a capacitor includes both
variables. This is similar to 2.1.1.5c)2) from 60950-1.
IEC 60479-2 provides a linearised treatment of a capacitive discharge to
the body. The examples consider both capacitive discharge charge and
energy. In TC108 safety documents IEC 60950-21 and the coming IEC
62368-3 you will find voltage versus maximum capacitance figures. What
is counter-intuitive is that these curves are set by the capacitor charge.
If you calculate the capacitor value from the maximum body energy value
far greater values of capacitance result. Whoever calculated the figure
capacitance values back in 2000 or so worked out that for Remote Feeding
Telecommunication circuits the capacitive charge was the critical
parameter, not energy, setting the maximum capacitance value.
Regards
Mick
-
----------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society emc-pstc discussion
list. To post a message to the list, send your e-mail to <emc-p...@ieee.org>
All emc-pstc postings are archived and searchable on the web at:
http://www.ieee-pses.org/emc-pstc.html
Attachments are not permitted but the IEEE PSES Online Communities site at
http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used
formats), large files, etc.
Website: http://www.ieee-pses.org/
Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe)
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas <sdoug...@ieee.org>
Mike Cantwell <mcantw...@ieee.org>
For policy questions, send mail to:
Jim Bacher: <j.bac...@ieee.org>
David Heald: <dhe...@gmail.com>
