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各位大佬，求指点，最近遇到 一款带有 调光功能的 LED SELV驱动，含有两个变压器，两路输出，认证时 判断输出隔离问题被卡住了，调光信号输入部分 与 两个输出 要有相应隔离 标准中说了，可以理解。: ]& j& r% }5 x8 Z9 A
但为何要将同一 二次侧的 两个 输出，判定为两个SELV电路，要求有隔离？这个不是太能理解1 j1 s8 z8 [0 Q3 J
还请各位大佬解惑，谢谢！; b# y0 P Y1 g+ z
iec 61347-1 15.4
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" N& ~: u I: I3 G1 s, eNOTE At present on the market the following types of control systems are available:3 j6 g$ N y) Z O5 }- |+ R! e
– FELV control signal, basic insulated to LV supply (e.g. Digital Addressable Lighting Interface and 0 to 10 V);' l- [' o6 d- L" l
– SELV control signal, (e.g. DMX);6 Z1 t. ?* ~; [8 i+ n$ r
– control signal, not insulated to LV supply (e.g. Push button control/phase cut/step dim)., C6 V$ V* g, |9 e
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The voltage in the circuits shall not be higher than the limits defined for ELV.
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SELV circuits shall be insulated from the LV supply by double or reinforced insulation (based
+ A/ Z- C& o3 _- {6 O9 yupon a working voltage across the insulation).6 L$ s4 L1 R L! t4 ^" C
SELV circuits shall be insulated from other non SELV circuits (except FELV) by double or; C* z2 }$ v/ B% U+ N: X
reinforced insulation (based upon a working voltage equal to highest voltage in the circuits).
; ?3 G" I2 {+ Q/ O) m- QSELV circuits shall be insulated from FELV circuits by supplementary insulation (based upon+ M0 G0 G4 V; F: b9 F. p8 u
a working voltage equal to LV supply voltage).
5 M, E j# U" S `3 j: mSELV circuits shall be insulated from other SELV circuits by basic insulation (based upon a0 l* s3 F8 q0 i
working voltage equal to highest voltage in the circuits).
5 y' A4 f& \( w+ GSELV circuits shall be insulated from accessible conductive parts by insulation according to0 [% P5 @# Q) \# c0 s
Table 6 in 15.4.5.4 i& v4 z, ~5 b: R0 Z% B. O
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发表于 2018-10-24 17:20
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