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4． IEC 60335-1中什么是电子开关？1 V6 }5 z' U8 ~4 c3 T0 e' W+ i
Note:
2 [/ m- t$ L. J$ x$ w3 A4.1 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。
- j' w9 c2 L+ ?& {4 l. q0 j5 r- u8 [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）9 q9 w4 F* u4 W. g# X/ o, G* A, \
4.3 24.1.3和Annex H也得看看。# c# S( K9 l% V; b+ m
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5． 关于IEC60335-1 cl 16关于泄漏电流加倍的讨论。
/ \- e" `, {7 y0 d. P" o; I1 S$ tNote: 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.
, u) u5 G; S3 B3 v( {* cIf the appliance is functionally switched off by a single-pole disconnection, then one end is left 7 L: M1 P+ r8 O- u5 Q# {) E' \" E
connected to the supply since the appliance is only functionally off. The leakage current
% e2 M; L0 O- T6 x8 }$ A' Cdistribution 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.
! P% i; M& T' K: Z; @# t8 s- hWhen 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).
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- i% E" o% X4 W, m% m+ pIf the appliance is switched off by an all pole disconnection switch or by withdrawal of a plug 0 w, Y, u! a* Y9 }3 H& z2 M4 f
then one end is not left connected to the supply when the appliance is off and the leakage 9 ?1 {5 S# N' s# R& T" e
current in the off position will be zero. The leakage current value measured during the test of
( `+ K. O- ^7 N9 W' b9 e16.2 will be twice the mean value experienced by the insulation in practice.
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, l8 h" h0 P8 ?3 L, ^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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