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4． IEC 60335-1中什么是电子开关？
& d- b: F2 Q% u5 e. }Note:
' X' p/ C4 g( q+ R9 x3 R- {4 ]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。
% C1 }1 ^% Q1 M/ j* w4.2 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）$ v3 E- E9 ?) `3 j; J. e! L1 R
4.3 24.1.3和Annex H也得看看。
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5． 关于IEC60335-1 cl 16关于泄漏电流加倍的讨论。
6 H4 W1 [; n, B/ Z c, BNote: 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.( P3 B7 k7 G* S# \& B
If the appliance is functionally switched off by a single-pole disconnection, then one end is left
" x, v1 }: a- m4 I1 m# Qconnected to the supply since the appliance is only functionally off. The leakage current : \, L+ t. S2 w! _. P
distribution 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.
1 l( b4 h3 n+ X0 y4 zWhen 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. # m2 e" H8 Y4 A) t& l
; |$ }6 K) o1 c# V, t
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). - o, J2 c0 ~+ g2 \" j4 q! }5 c8 M8 _' Y
3 Q6 [+ a) w; `! _% J! T5 eIf the appliance is switched off by an all pole disconnection switch or by withdrawal of a plug 7 U$ w% U; z: C7 r' O5 r
then one end is not left connected to the supply when the appliance is off and the leakage * v, R7 H# O0 E" |# L
current in the off position will be zero. The leakage current value measured during the test of & M$ k8 z+ Q) ^
16.2 will be twice the mean value experienced by the insulation in practice. ?+ D# }9 Z( h' _ }& u8 y
+ [, m ^; d% ^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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