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发表于 2011-6-9 16:05
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仔细看Annex C 中的C.1 overload test,
5 C! V2 V# X$ Y+ P% L5 jC.1 Overload test
- R! B. o7 r$ I4 Q. wIf the tests in this clause are conducted under simulated conditions on the bench, these
' J9 E5 d \) n0 T( qconditions shall include any protection device that would protect the transformer in the
( S+ r, o( P" B9 v; Q" pcomplete equipment.# v9 F- n4 g& ?
Transformers for switch mode power supply units are tested in the complete power supply unit% \4 g; Z9 ^3 o8 v U( v
or in the complete equipment. Test loads are applied to the output of the power supply unit.
, K/ A; a8 F- n5 q/ xA linear transformer or a ferro-resonant transformer has each secondary winding loaded in
6 }% f" E- Q& Vturn, with any other secondaries loaded between zero and their specified maxima to result in- A2 o4 I; d! y1 @: D# h& T" J
the maximum heating effect.( n v' n# r3 Z# p
The output of a switch mode power supply unit is loaded to result in the maximum heating) Y8 ?' Z! j+ A
effect in the transformer.5 }4 U* O2 }. p& i5 G2 x
NOTE For examples of loading to give the maximum heating effect, see Annex X.6 F/ d& v0 C' @5 I6 p l$ O3 f
Where an overload cannot occur or is unlikely to create a hazard, the above tests are not
3 a9 c; N* [# _3 ]made.4 S2 j( e! ]& f: r i
最后这句话：Where an overload cannot occur or is unlikely to create a hazard, the above tests are not made.+ | {% P X- l' p1 }% B
我觉得可以作为不用做过载的依据。 |
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发表于 2011-6-9 15:56