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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, : U |9 e8 G8 {
C.1 Overload test; d4 M/ x) _: g
If the tests in this clause are conducted under simulated conditions on the bench, these; N5 ]% E J# l/ v* \
conditions shall include any protection device that would protect the transformer in the( v3 I6 _2 \' \7 A5 h4 t
complete equipment.
9 U+ F1 K8 G; V6 mTransformers for switch mode power supply units are tested in the complete power supply unit9 X1 A4 T Y, M- i
or in the complete equipment. Test loads are applied to the output of the power supply unit.
# V( F+ Y1 z9 q7 ?" o7 l5 qA linear transformer or a ferro-resonant transformer has each secondary winding loaded in0 }) P+ e6 _8 D! _2 n
turn, with any other secondaries loaded between zero and their specified maxima to result in/ k# M6 ], p3 z
the maximum heating effect.* T# e$ m& m% H5 C, [! a
The output of a switch mode power supply unit is loaded to result in the maximum heating7 h# j7 O7 v1 V( b* w
effect in the transformer.
4 T. e1 P' f: N0 X! q4 @4 T0 G8 yNOTE For examples of loading to give the maximum heating effect, see Annex X.
8 J: l7 u/ u, ^* X; [/ v3 ^8 gWhere an overload cannot occur or is unlikely to create a hazard, the above tests are not* V' l! q7 k! z5 _& m# v
made.
z, K: f- }' Z0 M3 r! S最后这句话：Where an overload cannot occur or is unlikely to create a hazard, the above tests are not made.
& z' P5 e( n0 k6 C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