rainTK 发表于 2008-9-3 21:12

fuse comply with IEC 60127 shall subject to the subclause 19.12.there is a current requirment. (if ok, no other additional tests needed)
and other components operated(break), can consider to be an intentionally weak part.
when this weak part are broken to comply with this standard, and it shall be become permanently open-circuit.
this test shall repeat on second sample, this test shall also statisfactorily completed.

that means you only need to test two times total.

but the protected device in the fixed wiring does not provide the necessary protection.

you can read the clause 19 of iec 335-1

ljh809809 发表于 2008-10-22 10:26

引用第0楼huangbo0791于2008-08-29 15:01发表的 IEC60335-1元器件失效测试中 短路压敏电阻 :
在短路压敏电阻的测试中，PCB板中的weak part部分烧断，外部电源路闸，请问是否判合格

根据cl 24.2,肯定不合格。
你的weak part没有起到保护作用。

jsspace 发表于 2008-10-22 11:13

引用第21楼ljh809809于2008-10-22 10:26发表的:


根据cl 24.2,肯定不合格。
你的weak part没有起到保护作用。

CLS24.2似乎不能对压敏电阻进行判断。

wenyuan.jiang 发表于 2009-2-9 17:57

建议增加,Fuse或外部分断装置

jorny 发表于 2009-2-9 23:01

如果跳闸的过程中内部FUSE也动作了，可以认为是合格的

jorny 发表于 2009-2-9 23:03

如果16A的电流保护装置跳闸时内部FUSE也动作了，可以认为是合格的

老猪屁屁 发表于 2009-2-11 09:34

一直对压敏电阻和热敏电阻的问题比较疑惑，高手这么多，就请教一下：
按说电阻都不属于电子元件，按照19.11.2中的要求压敏电阻应该可以不短路的，为什么压敏电阻要进行短路（貌似按照91版的要求是可以不短路的，但是01版的就要短路了）？
对于热敏电阻:
Positive temperature coefficient resistors are not short-circuited if they are used within the
manufacturer's specification. However, PTC-S thermistors are short-circuited unless they
comply with IEC 60738-1.
PTC-S是一种什么样子的热敏电阻？短路热敏电阻的理由是什么？按道理失效热敏电阻的理由更充分啊.

huhaijun 发表于 2009-2-11 10:23

外部电源跳闸当然不合格

yw_shi 发表于 2009-2-12 00:38

你们产品在电路设计上不合理，短路压敏电阻后，及时外部FUSE接的再大也会跳闸，简单的解决方法就是去掉压敏电阻，当然这样会影响EMC测试，看你们的运气了

嘻嘻 发表于 2009-2-12 10:43

19.1 的NOTE中:
NOTE 2 Fuses, thermal cut-outs, overcurrent protection devices, or similar devices incorporated
in the appliance, may be used to provide the necessary protection. The protective device in the fixed wiring does not provide the necessary protection.
24.2 Appliances shall not be fitted with
– switches or automatic controls in flexible cords;
– devices that cause the protective device in the fixed wiring to operate in the event of a fault in the appliance;
– thermal cut-outs that can be reset by a soldering operation.
其中，The protective device in the fixed wiring does not provide the necessary protection与– devices that cause the protective device in the fixed wiring to operate in the event of a fault in the appliance;都说明了不可以接受
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