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发表于 2010-11-25 10:05
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引用第11楼山炮于2010-11-24 22:06发表的 :
9 n& \- N& Q1 a& Q+ G保护阻抗之所以可以用来跨接绝缘,其先决条件是有足够的稳定性,这一点600335中结构一章提到了,60065和60950没有仔细查核。两只电视高压包内的硅堆反向连接,其耐压也是数万伏级别。但构成电阻的是多只串联的PN结,那个仅靠添加不同物质所形成阻止电流反向通过的电场,不可能视其为有足够稳定性的,因而不能用作保护阻抗。 ' \4 i% u6 h3 q3 {; ^3 Y, v
你的理由很有说服力,但是在60950里面我找不到类似60335的说法,60950 2.9.1里面有列出了可以作为绝缘的材料,但是并没有列出半导体材料能不能作为绝缘,还有 2.10.5.4中 有如下内容:' I! i* h" H. o$ H8 t7 u5 ~# v
2.10.5.4 Semiconductor devices, J5 r$ Z F- e2 P
There is no minimum distance through insulation for SUPPLEMENTARY INSULATION or
6 D" `( P3 X, G2 a" C7 r) B! cREINFORCED INSULATION consisting of an insulating compound completely filling the casing of a& T- n- p6 `/ D4 ~
semiconductor component (for example, an optocoupler, see Figure F.17), provided that the! S: {* v/ Z3 A( p* Y8 a
component satisfies one of the following, a) or b):
+ G& U6 U/ R" La) – passes the TYPE TESTS and inspection criteria of 2.10.11; and
}' N( R7 O; G4 B– passes ROUTINE TESTS for electric strength during manufacturing, using the appropriate/ H; i* z! G0 j( D9 U6 p" P$ q
value of the test voltage in 5.2.2; or
) T3 A& w: z$ {, F1 Y/ bb) for an optocoupler only, complies with the requirements of IEC 60747-5-51), where the test
5 |1 w1 @! u. gvoltages as specified in 5.2.6 (of IEC 60747-5-5):- t% V8 h& ?- Z' h! [
– the voltage Vini,a for TYPE TESTING and
' B% {* z, ^6 s" t) F– the voltage Vini,b for ROUTINE TESTING,
; t. }* B+ f3 n0 [shall be the appropriate value of the test voltage in 5.2.2 of this standard.) z t7 Z* U& g: Q3 |( t) q
NOTE The above constructions may contain cemented joints, in which case 2.10.5.5 also applies.
9 E7 E; x, `& c% X0 S/ AAs an alternative to a) and b) above, it is permitted to treat a semiconductor according to% D# P, s2 m" Q9 W( f, ?6 h f
2.10.5.3, if applicable.
& \( R( D8 T0 o2 m5 E+ S4 N( XFor compliance criteria, see 2.10.5.1.
$ h9 X2 O- E! j F- x" R/ w! j* [/ m. |* y9 |3 o5 l- x4 J9 o
我个人理解二极管是可以满足a 的要求的,现在有争论的就是打耐压方向的问题,就像8楼所说的,标准没有规定从哪个方向打,既然没有规定,那我可以按对我产品有利的方向来打,就算是机构的工程师,如果说不允许,也要有相关的标准作为依据才可以反驳我的做法吧。我们都知道,只要二极管的反向击穿电压大于我们的绝缘耐压要求,按固定的方向来打耐压(DC)是可以打得过的。
6 }' n/ Q _0 E4 p; N; }" F% w1 ]" ~& Q, v* p5 N. P7 M7 k' e+ O$ O
继续期待着大家进行讨论。 |
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