950中变压器过载

安规007

广东安规检测
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貌似就是泛指的，我一直没能找出相关的决议。

aiduoxi

过载其实也可以在前端电路加以控制，这只是我个人见解
快一年没接触开关电源了

安规007

仔细看Annex C 中的C.1 overload test,
C.1 Overload test
) H2 K! ]) K+ q& {5 vIf the tests in this clause are conducted under simulated conditions on the bench, these
& y/ U6 @) ?1 ~" g/ ]2 l& \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
; z3 u7 B4 e; v* `# I. u( X- Xor 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
0 A, t+ s9 g. b! m+ w- x# reffect in the transformer.
1 d# M/ W  |* f; n! L  S# pNOTE For examples of loading to give the maximum heating effect, see Annex X.
0 Y! h! q. u3 l9 qWhere an overload cannot occur or is unlikely to create a hazard, the above tests are not
4 v1 q" y9 {/ i1 ?/ l) Lmade.
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。

琥珀流云

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.

fanfei0428

满足功能绝缘就可以了