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4． IEC 60335-1中什么是电子开关？' @) [: u) N* L; ?4 y; W+ K
Note: 8 |1 m$ \& v* c1 d! j3 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。
+ `4 A! V) j& I. p$ X4.2 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）
6 I6 x2 b8 u6 g4.3 24.1.3和Annex H也得看看。
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( Q2 \2 O* P3 z, j/ e5． 关于IEC60335-1 cl 16关于泄漏电流加倍的讨论。3 f5 T7 e) |: H$ l4 E7 s1 F. R1 R
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.0 _3 j* N! i0 h4 B) U3 d: c% q
If the appliance is functionally switched off by a single-pole disconnection, then one end is left + P, d# o8 h" A2 d7 k
connected to the supply since the appliance is only functionally off. The leakage current
6 c$ k/ z7 H, W$ }# j4 Sdistribution 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." g& R. W0 [+ }7 p0 `
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.
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When 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). m5 s- x- Q. l5 Q- r; J
+ F4 d$ o* E: N" c( q+ S( \# BIf the appliance is switched off by an all pole disconnection switch or by withdrawal of a plug i _$ ^2 [4 v1 w+ f# Q/ |2 Z% }
then one end is not left connected to the supply when the appliance is off and the leakage * N+ }# c' y8 G; j' g) S
current in the off position will be zero. The leakage current value measured during the test of
8 \# ^5 v( m/ |% w, k16.2 will be twice the mean value experienced by the insulation in practice. # z& ?, l3 P S; N) f
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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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