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4． IEC 60335-1中什么是电子开关？
" @. _- e, y5 {2 Y2 G* QNote: 8 B% l" e: p/ c/ {% O' P/ b* I
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。
# M1 X/ I* v A8 D( ]* f4.2 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）/ j: `9 ~5 r; g# b+ A4 q2 p5 M
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。' h/ ^! V' d6 b4 j& a) e. D+ J
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.
/ t3 y' n5 W" d2 S0 F! J5 k0 BIf the appliance is functionally switched off by a single-pole disconnection, then one end is left 4 e/ {- y$ t) j" Z4 ^
connected to the supply since the appliance is only functionally off. The leakage current 7 X7 }- E' k4 [, Q8 P+ {2 y& V
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.# u/ v! _; B, E$ @* |
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. & I5 p2 U- `& H5 _- ~: q, s
' {: B8 S8 x) z" n+ CWhen 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). , F6 m4 | B# Z8 D, L/ \
! N1 X/ Y0 r/ R, }( x2 Z: \If the appliance is switched off by an all pole disconnection switch or by withdrawal of a plug 7 M+ l. G) B1 ^5 m$ ^. K6 f
then one end is not left connected to the supply when the appliance is off and the leakage ' g s: s. W( y$ o6 Y& L
current in the off position will be zero. The leakage current value measured during the test of 2 N/ o6 v5 [9 N7 r+ K
16.2 will be twice the mean value experienced by the insulation in practice. . R' y0 B% q* V5 f8 G& O
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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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