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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。' Q! x+ P- M( Y
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
. C/ `4 U f' _, Q4 j还请各位大佬解惑，谢谢！7 R5 ?, _9 T/ s& G8 L
iec 61347-1 15.43 a0 p) e5 [3 a" g* w& _0 _4 c
g# ~! s; g6 R: V& X% H# Y( u% B- CNOTE At present on the market the following types of control systems are available:
& c, u, V( b9 Y7 M! B5 \– FELV control signal, basic insulated to LV supply (e.g. Digital Addressable Lighting Interface and 0 to 10 V);% X7 Z) Y$ M) z2 G! p
– SELV control signal, (e.g. DMX);
' O B& p* V0 u: z– control signal, not insulated to LV supply (e.g. Push button control/phase cut/step dim).
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$ r0 H- ]5 z T% Q& v* |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
& V3 }4 F* s7 }3 U j+ v* h% iupon a working voltage across the insulation).+ E4 T2 _0 A" P4 G. {8 W Z2 r, |
SELV circuits shall be insulated from other non SELV circuits (except FELV) by double or) {/ O4 R- @% Q7 S* s5 n
reinforced insulation (based upon a working voltage equal to highest voltage in the circuits).5 l! m: `) R4 M6 v7 {9 m
SELV circuits shall be insulated from FELV circuits by supplementary insulation (based upon
" Y+ d+ C# k3 o5 ca working voltage equal to LV supply voltage).. f+ q8 {6 ~' K& h! [$ j
SELV circuits shall be insulated from other SELV circuits by basic insulation (based upon a) ?. {( {4 P' `: C. T; x5 C
working voltage equal to highest voltage in the circuits).. |0 ?, T: H; t9 I9 B
SELV circuits shall be insulated from accessible conductive parts by insulation according to
; P- L% @7 ?1 t/ TTable 6 in 15.4.5.
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8 Q8 h/ q- K6 G: B: h7 }: B" d2 T |
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发表于 2018-10-24 17:20
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