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.
/ d0 J' U( U, D2 f2 B8 _. [when this weak part are broken to comply with this standard, and it shall be become permanently open-circuit.
4 q2 A9 d. v! R9 ^9 Pthis test shall repeat on second sample, this test shall also statisfactorily completed.
! i# f# f2 L* X/ P: ]* W! y
that means you only need to test two times total.
3 |7 Z- n$ N( z( R( `: `3 p7 N
but the protected device in the fixed wiring does not provide the necessary protection.
$ i/ Y& G  B6 E3 E/ H
2 j: F- V8 j, J- Q! qyou 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 :
6 N) G0 O' Z! M" r0 d9 y9 n$ n6 q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

引用第21楼ljh809809于2008-10-22 10:26发表的  :


: ]1 L, e) }; X" n根据cl 24.2,肯定不合格。
& H  R6 p7 D$ n* C! D9 E你的weak part没有起到保护作用。

9 Y( }! D" j/ w' M/ V+ @0 z# zCLS24.2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：
$ v- E6 ]: J* }! e1 u) ?( X; a  O+ V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:
4 p; W2 H9 O. r/ y9 X0 c/ ]4 B- ?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

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:
' r" X0 z2 J0 D/ t7 Y8 L6 S, i& k NOTE 2 Fuses, thermal cut-outs, overcurrent protection devices, or similar devices incorporated
, g7 b& V& K6 d# u( r 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;
' ~! O$ E$ E9 M" B/ Y– devices that cause the protective device in the fixed wiring to operate in the event of a fault in the appliance;
2 j+ y; o0 K/ ~9 H' ~– thermal cut-outs that can be reset by a soldering operation.
! K! z6 T8 u& w3 c+ a% H' J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