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)
6 @9 T* j3 D$ W; wand 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.
. A) b0 W" I/ F$ |6 o5 a
( W; Z) _& {4 b( v. B  ]+ k! Qthat means you only need to test two times total.
6 o. r  C8 l$ @! Y
2 N0 }. [$ H, O, l/ Vbut the protected device in the fixed wiring does not provide the necessary protection.
# N. ]# u" `6 |2 u" k
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 :
( h: f, R: \* C* S6 J, h+ b5 ~" W2 k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

) u" ?' y$ L$ K: j根据cl 24.2,肯定不合格。
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  :


根据cl 24.2,肯定不合格。
  j, h( D* q: z  p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：
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）？
0 [4 y; f" i; E+ I$ E/ @对于热敏电阻:
0 o" Q' t4 Z/ G. h. q5 C( u  zPositive 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
6 d) z0 M% F& z7 [; c4 mcomply with IEC 60738-1.
3 o  d: v+ t" B, c/ ePTC-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
' ]- B' o) h4 |: L6 @ 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
6 l7 B& d- |- Y; c, g– 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;
3 w- Q9 a: L& V7 g9 g! s9 t: N4 z– thermal cut-outs that can be reset by a soldering operation.
' W! l( R) T3 ^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