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Home > Forums > Electrical / Electronic Engineers > Activities > Power Supply and Electronic Component Design Forum

Intrinsic Safety Assessment, EN60079-25 and non-linear Power Supply

Read More Threads Like This One

DaMan13 (Computer)

15 Nov 11 14:50

I wounder if somebody can shade some light on how to determine whether a power source is linear or non-linear according to EN 60079-25. Many Thanks

MacGyverS2000 (Electrical)

16 Nov 11 7:11

A non-linear power supply draws power in pulses, like a switching supply.

Dan - Owner
http://www.Hi-TecDesigns.com

itsmoked (Electrical)

21 Nov 11 17:14

That's certainly a novel view since most Linear supplies do that.

Keith Cress
kcress - http://www.flaminsystems.com

ScottyUK (Electrical)

22 Nov 11 1:43

Check the standard.

In the standard it looks more the term is used with regard to the relationship between current and voltage following an ohmic relationship, i.e. an unregulated source which could be modelled as an ideal cell with a series resistance.

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If we learn from our mistakes I'm getting a great education!

MacGyverS2000 (Electrical)

22 Nov 11 7:04

Keith,

I think the intent was PWM versus 60Hz sine...

Dan - Owner
http://www.Hi-TecDesigns.com

itsmoked (Electrical)

22 Nov 11 14:55

I'll never know because I'm not giving the thieves 2oo bucks for a standard.

Keith Cress
kcress - http://www.flaminsystems.com

ScottyUK (Electrical)

22 Nov 11 16:08

Ha-ha, yeah it's pretty steep isn't it, especially for a set of standards which are all but mandatory to comply with the ATEX Directive.

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If we learn from our mistakes I'm getting a great education!

hgldr (Electrical)

30 Nov 11 20:23

ScottyUK is correct. EN60079-25 defines a linear supply to be a fixed voltage followed by a resistor so that dV/dI is always equal to R.

If you don't have $200 you can google it.
<http://qc.met.wallonie.be/fr/normes/doc/NBN_EN_60079-25%3B2010(E)_2.pdf>

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