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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。. D( P: u$ J7 f6 @& A# d, Q& q
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2 E0 p/ M& c, T- i: @% \
还请各位大佬解惑,谢谢!
# M/ h# n4 \+ Tiec 61347-1 15.4/ w; C, S0 o1 D0 T4 U
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NOTE At present on the market the following types of control systems are available:$ |2 P/ r) y: p
– FELV control signal, basic insulated to LV supply (e.g. Digital Addressable Lighting Interface and 0 to 10 V);4 X3 c( P$ p; ], j/ e/ v9 m
– SELV control signal, (e.g. DMX);
+ ^8 C. E) L$ Z( S) q8 M* U– control signal, not insulated to LV supply (e.g. Push button control/phase cut/step dim).6 u3 Q7 A. N7 e
! b+ p+ G6 v& J# Q, n) VThe voltage in the circuits shall not be higher than the limits defined for ELV.! H: v3 _* K4 d# t+ V) i x% M
& T7 B/ }8 {7 d' K" F$ O
SELV circuits shall be insulated from the LV supply by double or reinforced insulation (based* W9 p0 b' X& m# H. T
upon a working voltage across the insulation).
: ?" ~( r3 a6 \+ \$ nSELV circuits shall be insulated from other non SELV circuits (except FELV) by double or
) o' u+ h8 ?7 [+ i: u+ nreinforced insulation (based upon a working voltage equal to highest voltage in the circuits).
3 g: {$ o" Z+ o0 D8 i8 xSELV circuits shall be insulated from FELV circuits by supplementary insulation (based upon
, V! O* Y3 s. A. k, Ta working voltage equal to LV supply voltage). J6 U* H1 {8 D0 S
SELV circuits shall be insulated from other SELV circuits by basic insulation (based upon a9 m/ z) l. K$ D3 n& u, l
working voltage equal to highest voltage in the circuits).% L$ `' S, S5 u3 j+ G, a
SELV circuits shall be insulated from accessible conductive parts by insulation according to
7 R- v3 x; x c. x& cTable 6 in 15.4.5.
. h, ~' x6 f& o& z$ L+ r3 v2 A/ R' l* \7 V: |
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