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在输出端过载是正确的. * H; b3 l9 v+ ]
标准明确规定对于开关电源变压器过载要在完整的电源单元上或完整的设备上进行。
1 t1 s ?/ v9 ^4 {) R# O 对于线性变压器,要在每一次级上加载。" M7 _2 [% u, }- r, m
% k8 _3 n3 ?% P- e8 @( z
具体参考IEC/EN 60950-1 附录C关于变压器过载的测试
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Annex C (normative)9 X5 a8 ^" i# K' w: O
Transformers (see 1.5.4 and 5.3.3) b* i4 p& E- t, j- ^& q
3 _2 [0 p" a5 }8 \ J. WC.1 Overload test
3 _4 ]1 A3 e& ?If the tests in this clause are conducted under simulated conditions on the bench, these
, G2 q4 {/ Y) u" I/ w3 Lconditions shall include any protection device that would protect the transformer in the
1 s. U( l/ j: p' M; n; s6 ucomplete equipment.
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" y# N0 q+ i2 b5 s# [) I5 K' iTransformers for switch mode power supply units are tested in the complete power supply unit
! b* P5 x- q4 n0 z! a0 h0 jor in the complete equipment. Test loads are applied to the output of the power supply unit.1 L8 q; |$ h) I$ ?
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A linear transformer or a ferro-resonant transformer has each secondary winding loaded in
% z/ t9 r4 i" @% Aturn, with any other secondaries loaded between zero and their specified maxima to result in
L/ p7 o+ i9 c. y/ Mthe maximum heating effect. |
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