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4． IEC 60335-1中什么是电子开关？
- i, m6 F1 u' m% q6 l0 M% ENote: 5 o+ o |% F0 c0 O0 f0 m! [
4.1 60335-1中提到电子开关涉及的测试最主要就是19.11.4, 当然这个要和off position (3.8.2)一起考虑才有意义。+ R, H- l% G+ Q: X6 \- N6 b; k8 N
4.2 单纯地看待电子开关的话，请参看61058-1 table 15会很清楚：SSD without electrical contacts, SSD with serial contacts, SSD with parrel contacts, SSD with serial and parrllel contacts, 电子开关可以是半导体元件通断电实现off position, 或者是控制机械触点实现（例如继电器）7 m3 E4 g- H! d
4.3 24.1.3和Annex H也得看看。
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" V: q$ N' O" V0 { v$ K- |5． 关于IEC60335-1 cl 16关于泄漏电流加倍的讨论。, X* W: I7 _6 J8 h4 K' m
Note: 这个问题在IEC TC 61 Chairman D.R.Johns写的IEC 60335 interpretation 里面有比较清晰的解释.7 h1 c% f! Z% @1 E% t3 ` X
If the appliance is functionally switched off by a single-pole disconnection, then one end is left " D5 e5 ~ N9 v( O
connected to the supply since the appliance is only functionally off. The leakage current
5 o/ x) d2 Y$ D9 L( K: N1 Bdistribution in the functionally off position can be as shown in figure A (格式问题，图贴不上来） and the nett leakage current will be Ix, where Ix is the leakage current per unit length of the insulation.6 M3 _& X* G5 X U
When the appliance is tested according to the method detailed in 16.2, the leakage current distribution will be as shown in figure A (格式问题，图贴不上来）and the nett leakage current will be Ix. 7 a, S' [, x! P9 K2 f
0 M0 Y% z- o% F& {5 C) e& _3 YWhen the appliance is on the leakage current distribution will be as shown in figure B (格式问题，图贴不上来）and the nett leakage current will be Ix/2 (since the appliance neutral is normally at or near earth potential). 9 F4 g1 G3 k+ i' i: ^( o& A
4 B, Z2 P. j9 w9 e
If the appliance is switched off by an all pole disconnection switch or by withdrawal of a plug & U$ J- O+ \; ^4 ]# [( ^) c
then one end is not left connected to the supply when the appliance is off and the leakage , u+ Q+ @7 u1 V S& j/ ^8 _
current in the off position will be zero. The leakage current value measured during the test of ( P Q$ {# ]4 L9 e- z3 [% c' |
16.2 will be twice the mean value experienced by the insulation in practice. D0 M. G% Y) F, F
) \0 T, j+ i9 }It is therefore, permissible to double the limit and still achieve the same level of safety as in the case where the appliance is switched off by a single pole disconnection switch. |
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发表于 2009-4-11 01:26
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