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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, ( G9 C, e: }5 {. R6 |% y
C.1 Overload test2 {4 H9 W3 Y2 p* G1 `4 [7 n
If the tests in this clause are conducted under simulated conditions on the bench, these1 J0 y8 m3 f* q
conditions shall include any protection device that would protect the transformer in the
* n* D9 E& B* Mcomplete equipment.
" k! ~, |6 ], t3 t6 w$ xTransformers for switch mode power supply units are tested in the complete power supply unit
7 ]& r" ~5 d/ J4 Bor in the complete equipment. Test loads are applied to the output of the power supply unit.( ~, w0 R% F8 |. I2 [- J' a
A linear transformer or a ferro-resonant transformer has each secondary winding loaded in
# ^2 B! r% ^1 f0 I! V( G( J: aturn, with any other secondaries loaded between zero and their specified maxima to result in5 n, M9 }, S/ N, c T0 p) w9 D. n
the maximum heating effect.
! }( R0 `! o: }% j9 a2 VThe output of a switch mode power supply unit is loaded to result in the maximum heating
" W6 @2 o F6 l5 n# n- C: ? Qeffect in the transformer.
; b3 ? t6 `- c# r3 g/ k% R) uNOTE For examples of loading to give the maximum heating effect, see Annex X.0 L1 ^6 n6 v& @7 r5 v5 Z2 H
Where an overload cannot occur or is unlikely to create a hazard, the above tests are not
. z4 U U* e& T: m2 Amade.9 W1 @) ~! l" \: L- c
最后这句话：Where an overload cannot occur or is unlikely to create a hazard, the above tests are not made." w- ~2 {3 H1 Z" d2 J+ B
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
