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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。9 d$ M7 B" f# {8 B6 ]8 M |
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6 x2 C1 \) w# G
还请各位大佬解惑，谢谢！3 z: H, E+ m; c# S2 M3 \0 q
iec 61347-1 15.4
* m# |/ R" O+ k
3 }- }4 v4 U* m+ A5 p- Q3 H2 x' ~9 mNOTE At present on the market the following types of control systems are available:
( S% N" I; {4 y1 y) ]* k– FELV control signal, basic insulated to LV supply (e.g. Digital Addressable Lighting Interface and 0 to 10 V);+ K! z1 k2 R; W0 k$ l" n( R
– SELV control signal, (e.g. DMX);# P! \' d$ L# I
– control signal, not insulated to LV supply (e.g. Push button control/phase cut/step dim).# N. ^% i' X9 W4 c( v' ]
; b. E# @1 ~/ S' i9 ^The voltage in the circuits shall not be higher than the limits defined for ELV.
( E+ d0 d+ r1 k2 n
$ r9 G3 ~% w9 x ]: I5 cSELV circuits shall be insulated from the LV supply by double or reinforced insulation (based# w1 e) M0 a1 u
upon a working voltage across the insulation).
, u" \( `. Y* M; s; eSELV circuits shall be insulated from other non SELV circuits (except FELV) by double or
1 L% g: \( ]: k9 r: j! A" [reinforced insulation (based upon a working voltage equal to highest voltage in the circuits).5 _' X& b& |8 l" m8 _
SELV circuits shall be insulated from FELV circuits by supplementary insulation (based upon
" s. Q" S: l7 o' \a working voltage equal to LV supply voltage).- S$ F# x) |3 D4 C* q: l% f$ t
SELV circuits shall be insulated from other SELV circuits by basic insulation (based upon a7 I* W8 c9 H+ M y+ P5 K
working voltage equal to highest voltage in the circuits).8 k: p% g, \- P9 ^9 j
SELV circuits shall be insulated from accessible conductive parts by insulation according to
4 b2 b8 z$ P: [/ K! `: ]* TTable 6 in 15.4.5." p% W* i' V( k' y) @
/ Q! O$ v4 \% S
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发表于 2018-10-24 17:20
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