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

[DaMan13]

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]

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

Dan - Owner

http://www.Hi-TecDesigns.com

 

[itsmoked]

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

Keith Cress
kcress -

http://www.flaminsystems.com

 

[ScottyUK]

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]

Keith,

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

Dan - Owner

http://www.Hi-TecDesigns.com

 

[itsmoked]

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

Keith Cress
kcress -

http://www.flaminsystems.com

 

[ScottyUK]

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!

 

[DHambley]

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.
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http://qc.met.wallonie.be/fr/normes/doc/NBN_EN_60079-25;2010(E)_2.pdf>