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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, * M8 a& Z7 _! a
C.1 Overload test' L( m* P% N4 G( p7 F# D% p! Y
If the tests in this clause are conducted under simulated conditions on the bench, these
0 _% g% x2 w+ G& g' L( f3 @+ V& jconditions shall include any protection device that would protect the transformer in the
, f5 Q! y9 O3 Tcomplete equipment.3 o9 ~6 I- ^# E' V
Transformers for switch mode power supply units are tested in the complete power supply unit7 M$ [7 l' n8 i* F4 l8 O
or in the complete equipment. Test loads are applied to the output of the power supply unit.
2 E; Q/ P# m5 H! g* [A linear transformer or a ferro-resonant transformer has each secondary winding loaded in: \& l) h# e1 i% W9 J
turn, with any other secondaries loaded between zero and their specified maxima to result in( m9 Z8 x) J* G# ]
the maximum heating effect.6 [! @6 i; E o0 m
The output of a switch mode power supply unit is loaded to result in the maximum heating" r/ D) @6 ^/ t5 K; \2 o+ J
effect in the transformer.
2 {, W* g0 a7 K) lNOTE For examples of loading to give the maximum heating effect, see Annex X.6 A& A$ l& V$ _/ ]0 y% M: Z$ C
Where an overload cannot occur or is unlikely to create a hazard, the above tests are not' H9 v- v+ f& p8 _% e
made.
5 W7 Y- u2 o/ U最后这句话：Where an overload cannot occur or is unlikely to create a hazard, the above tests are not made.$ S7 c F N! q: Y6 l1 P
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