压敏电阻问题

harlan.tan

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请问产品中压敏电阻要求满足85度，3KA/6000V的测试要求，依据是什么，标准有更新吗？

hgf397556998

这个是元器件的标准要求，如果放在音视频标准中，元器件的要求要基于PCB板上，如果PCB板的限值是75K，你的这个压敏电阻85-35=50K，不符合要求，你觉得呢?

sharkxiao

依照UL1449

harlan.tan

主要是3KA/6000V的测试要求

xuxuxu

看标准EN600065：
/ {9 ]3 j9 l, }% n14.12 Surge suppression varistors
+ ]2 b3 @+ L  \/ N) f. oSurge suppression varistors used in order to prevent MAINS overvoltages coming into the
7 [+ x. ]7 m2 z6 U* t- j% n; ?5 i+ ^* l9 bapparatus shall comply with IEC 61051-2.
Such components shall not be connected between parts connected to the MAINS and
ACCESSIBLE conductive parts or parts connected to them, except for earthed parts of
* S$ y9 G: C5 y% `- u) wPERMANENTLY CONNECTED APPARATUS.

Reference is made to IEC 61051-2 where the following requirements apply:
– preferred climatic categories (2.1.1 of IEC 61051-2)
4 c/ _! W% B9 f: Q! ? maximum lower temperature: –10 °C
 minimum upper temperature: +85 °C
 minimum duration of climatic tests: 21 days
5 T# v7 f5 ^, D– maximum continuous voltages (2.1.2 of IEC 61051-2)
  p8 A( t3 y$ ?0 H
; S0 T5 W- {' i! n0 e. nThe minimum value of the maximum continuous a.c. voltage shall be 1,2 times the RATED
SUPPLY VOLTAGE of the apparatus.
– current pulse rating (IEC 61051-2, subclause 2.1.2)

; |& F4 L1 @- [8 K: `Surge suppression varistors shall withstand a combination pulse of 6 kV/3 kA with voltage
! _. @! c- B4 W* X: Twaveform of 1,2/50 s and current waveform of 8/20 s.
- ~( p$ c, M! U
Compliance is checked by applying the test of IEC 61051-2, group 1. After the test, the
5 ^' |( s8 I. _% m5 w: G$ Vvaristor voltage (as defined in IEC 61051) shall not have changed by more than 10 % when
% Z4 X/ d  Y! }6 c; @measured with the manufacturer’s specified current.
– fire hazard (IEC 61051-2, table I, group 6)

The coating of surge suppression varistors shall have a flammability category V-0 or better
according to IEC 60707.
" @0 \% m; \" I$ T2 }Compliance is checked according to IEC 60707 or according to clause G.1.1 of annex G.
1 A; n4 r: W( E( V1 |9 Y. Y– thermal stress
) S% K: S( f4 E8 ~( G! v. S8 ]
For apparatus with nominal MAINS voltage of <150 V, the apparatus and a test resistor
* J+ N& i+ \' r# P2 V" R5 k' D/ Iconnected in series with the apparatus shall be energised from an a.c. source of 250 V.
, J1 ^! Q4 U/ p1 |$ R' MThe voltage source shall be applied for 4 h or until the circuit path through the varistor
4 p# F5 M: M" l: t. ?; Jopens for each of the test series resistance values: 2 000
, 500
, 250
, 50
. A
separate apparatus shall be used for each resistor value, unless damage from the previous
8 T" T" V$ w$ ^8 S8 ~( jtest has been repaired.
, r4 h" d1 j/ O  EAt the end of each test, the apparatus shall comply with clause 11.

brucejbb

压敏电阻3KA/6000V相关参数可以在证书中找到吗(如: VDE证书)? 如果在证书中找不到相关参数, 怎么证明该元件是满足这个要求的呢? 不可能做随机测试吧! 期待高手回复...........

harlan.tan

感谢讲解，

Williamh

VDE证书上可以看的到

xuxuxu

brucejbb 发表于 2013-2-27 12:48
压敏电阻3KA/6000V相关参数可以在证书中找到吗(如: VDE证书)? 如果在证书中找不到相关参数, 怎么证明该元件 ...

VDE 证书上都可以找到。
( U% v% W  k" I1 N) B8 [0 x可以针对该项做随机测试。

xuehua_123

一般VDE证书上面会有 40/085/56 这个代表在40度条件下做了56天，限定值是85度。如果有For IEC 60950-1:2005, Annex Q 字样，就是满足3KA/6000V要求的。