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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,
, n# b7 L2 n l" X5 U7 d: r' ]C.1 Overload test
9 T9 n; d$ M' g3 r; l; `( qIf the tests in this clause are conducted under simulated conditions on the bench, these
; p2 d+ [9 ~ n! |: H9 H( N. ~: uconditions shall include any protection device that would protect the transformer in the- e- j9 w# e/ Q9 X0 O
complete equipment.8 a I% k+ O* B# K, ?0 I; Q
Transformers for switch mode power supply units are tested in the complete power supply unit* v" s9 t9 @' ^7 L3 S
or in the complete equipment. Test loads are applied to the output of the power supply unit.
; C; {& ~7 E u9 f1 kA linear transformer or a ferro-resonant transformer has each secondary winding loaded in
7 W* G; j# ]5 pturn, with any other secondaries loaded between zero and their specified maxima to result in4 a2 ^+ s; K, y9 q) i' R% l
the maximum heating effect.$ ~# u) |4 r; |
The output of a switch mode power supply unit is loaded to result in the maximum heating" W0 ]% _- ~8 {6 S% [7 X
effect in the transformer.
/ F4 f' a7 S2 y1 {( ~6 I. wNOTE For examples of loading to give the maximum heating effect, see Annex X.: ]) n+ z! X3 s4 ?# f
Where an overload cannot occur or is unlikely to create a hazard, the above tests are not
3 I: N- R' b( [6 L3 u% |made.# Y% f2 |5 E, ~$ M
最后这句话：Where an overload cannot occur or is unlikely to create a hazard, the above tests are not made.
) N' @- }& Y8 J, M g% ^# E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