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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,
, R- P w: h' X l; R& {" ]C.1 Overload test5 e, p$ E% t, s2 a7 W
If the tests in this clause are conducted under simulated conditions on the bench, these
8 f# M0 q# }6 x! ?) e6 \conditions shall include any protection device that would protect the transformer in the
1 i# h$ s! C2 A, e/ @complete equipment.
( Q( z ]- b9 Q' ?0 E2 ?Transformers for switch mode power supply units are tested in the complete power supply unit
/ u5 }0 ?6 p0 ]3 \# S* Lor in the complete equipment. Test loads are applied to the output of the power supply unit.
_2 S# X- K1 m( X4 @; l* I7 |6 QA linear transformer or a ferro-resonant transformer has each secondary winding loaded in0 B8 i/ |* [# Q% N4 U3 `4 p# F
turn, with any other secondaries loaded between zero and their specified maxima to result in3 H# R8 {% m ^% [ X, T( y8 I
the maximum heating effect.
5 Z3 I" S% E& o ]" ^" ]8 {The output of a switch mode power supply unit is loaded to result in the maximum heating
7 P$ a1 A# j+ w/ h6 H# Qeffect in the transformer.
# m! }$ e) Y. U% b$ n- r* {9 {' DNOTE For examples of loading to give the maximum heating effect, see Annex X.
: Z2 Z1 _ _( QWhere an overload cannot occur or is unlikely to create a hazard, the above tests are not4 ^$ f: Y D5 F q4 W
made.
9 ^, z0 B3 p2 J1 v4 V- d0 T4 W最后这句话：Where an overload cannot occur or is unlikely to create a hazard, the above tests are not made.1 T0 r" w `# j( x6 i
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
