[PSES] Fw: new message

[Lesleigh Campanale]

Hello!

 

New message, please read 

 

Lesleigh Campanale


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[PSES] Fw: new message

[Lesleigh Campanale]

Hello!

 

New message, please read 

 

Lesleigh Campanale


-

This message is from the IEEE Product Safety Engineering Society emc-pstc 
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[PSES] Fw: new message

[Lesleigh Campanale]

Hello!

 

New message, please read 

 

Lesleigh Campanale


-

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 


All emc-pstc postings are archived and searchable on the web at:
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Re: [PSES] EN 62368-1 query

[Mick Maytum]

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

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