IEC60335-1元器件失效测试中 短路压敏电阻

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IEC60335试验指甲

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.
* j5 s4 u& s# E, ~8 Owhen 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.

* I; T" O* V4 s& E7 w  kthat means you only need to test two times total.

but the protected device in the fixed wiring does not provide the necessary protection.
* C+ [0 K* x* Q8 t9 e. J: ^  {
you can read the clause 19 of iec 335-1

ljh809809

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

! ^* ?- u2 P( F) |; E根据cl 24.2,肯定不合格。
. y/ b- ?/ ^; [( ]. H+ n, L5 P' p: V你的weak part没有起到保护作用。

jsspace

引用第21楼ljh809809于2008-10-22 10:26发表的  :
0 n; G; s1 {' F2 I

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

建议增加,Fuse或外部分断装置

jorny

如果跳闸的过程中内部FUSE也动作了，可以认为是合格的

jorny

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

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：
4 u: E" B% d+ [3 W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
" k9 {/ e4 d4 P9 ?1 ycomply 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

外部电源跳闸当然不合格   [s:90]  [s:90]

yw_shi

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

19.1 的NOTE中:
NOTE 2 Fuses, thermal cut-outs, overcurrent protection devices, or similar devices incorporated
' ]8 v$ l& S3 L4 F& S in the appliance, may be used to provide the necessary protection. The protective device in the fixed wiring does not provide the necessary protection.
% s% Q7 v; @& z24.2 Appliances shall not be fitted with
– switches or automatic controls in flexible cords;
7 h& [& W+ T) G8 {( P– devices that cause the protective device in the fixed wiring to operate in the event of a fault in the appliance;
4 X+ U* D4 D+ x– thermal cut-outs that can be reset by a soldering operation.
# F. }' l' N, z5 {- n8 ?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