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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,
# k! J2 }; u7 Z1 y& X. xC.1 Overload test6 X0 G1 Y; G9 u. ]) p
If the tests in this clause are conducted under simulated conditions on the bench, these6 [8 {8 _0 P/ s3 J. o
conditions shall include any protection device that would protect the transformer in the" e9 L' d* h! I7 g. F# H
complete equipment.$ W1 D# p% d$ r
Transformers for switch mode power supply units are tested in the complete power supply unit; _; V5 |* `# z1 i3 t* O6 N! O
or in the complete equipment. Test loads are applied to the output of the power supply unit.* n1 M! e7 A. t0 K% c( X$ Y& Z
A linear transformer or a ferro-resonant transformer has each secondary winding loaded in
8 o. J5 o0 O( g8 H; P" Lturn, with any other secondaries loaded between zero and their specified maxima to result in
7 ` x3 O2 E) h# f: A' H! Ethe maximum heating effect.1 n0 Q8 _& p$ ^2 k; _
The output of a switch mode power supply unit is loaded to result in the maximum heating
. R( ?' M+ R& c( C6 w1 K3 [, Peffect in the transformer.
+ d5 I! N' ^$ Q. B4 b* X+ iNOTE For examples of loading to give the maximum heating effect, see Annex X.( A A; y1 z# M5 T3 i% O
Where an overload cannot occur or is unlikely to create a hazard, the above tests are not% F6 t" ]3 l; L# G2 o
made.: \ _& c7 A. o& s' Q/ l
最后这句话：Where an overload cannot occur or is unlikely to create a hazard, the above tests are not made.7 b+ R" o5 G" D" B1 h g
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