快一年没接触开关电源了 仔细看Annex C 中的C.1 overload test,
C.1 Overload test
If the tests in this clause are conducted under simulated conditions on the bench, these
conditions shall include any protection device that would protect the transformer in the
complete equipment.
Transformers for switch mode power supply units are tested in the complete power supply unit
or in the complete equipment. Test loads are applied to the output of the power supply unit.
A linear transformer or a ferro-resonant transformer has each secondary winding loaded in
turn, with any other secondaries loaded between zero and their specified maxima to result in
the maximum heating effect.
The output of a switch mode power supply unit is loaded to result in the maximum heating
effect in the transformer.
NOTE For examples of loading to give the maximum heating effect, see Annex X.
Where an overload cannot occur or is unlikely to create a hazard, the above tests are not
made.
最后这句话：Where an overload cannot occur or is unlikely to create a hazard, the above tests are not made.
我觉得可以作为不用做过载的依据。 呵呵 这种初级变压器很常见啊,我的理解是不用做过载.首先我们明白为什么要做过载,就是考量变压器在过载情况下,是否会造成过温,破坏绝缘等等.初级变压器跨接的只是功能绝缘.
标准里面有一句话:Where an overload cannot occur or is unlikely to create a hazard, the above tests are not made. 有些夸接加强绝缘的变压器也可以不做过载,要分析这组线圈是否会发生过载现象. 满足功能绝缘就可以了
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