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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。
& Q4 d3 G( k- I2 p8 r7 u: L4 Z/ ~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- @8 D, b' b, D7 j$ c! {/ }
还请各位大佬解惑,谢谢!
% e8 t9 T8 Q+ e5 fiec 61347-1 15.4; j( p3 T3 N9 T! |3 Z$ p( o0 M/ _! q
) `/ I) J a' B1 gNOTE At present on the market the following types of control systems are available:$ w& b4 }1 p3 F8 {! @6 I$ X
– FELV control signal, basic insulated to LV supply (e.g. Digital Addressable Lighting Interface and 0 to 10 V);: Q/ D* i+ g, ?$ e2 i: x
– SELV control signal, (e.g. DMX);
" y) | ] m2 [% k6 o– control signal, not insulated to LV supply (e.g. Push button control/phase cut/step dim).
5 c/ D8 Q) |- j1 d I V
0 F# L/ ^; o; RThe voltage in the circuits shall not be higher than the limits defined for ELV.
: V9 Y8 e s. T6 v, U- Q9 z) \6 F4 I3 L- V
SELV circuits shall be insulated from the LV supply by double or reinforced insulation (based2 W! G( E( U" C# {0 f4 x( g' p
upon a working voltage across the insulation).
% B4 a s+ E/ bSELV circuits shall be insulated from other non SELV circuits (except FELV) by double or1 z3 h! z3 G; _8 Q; V0 x! u
reinforced insulation (based upon a working voltage equal to highest voltage in the circuits).9 b) X& i+ X4 J1 j8 b
SELV circuits shall be insulated from FELV circuits by supplementary insulation (based upon
) |/ F2 N, B/ [2 R; g+ T) `a working voltage equal to LV supply voltage).
2 K P/ J5 y& T# [$ ?3 ASELV circuits shall be insulated from other SELV circuits by basic insulation (based upon a
' h4 B! K% A* L1 kworking voltage equal to highest voltage in the circuits).( T) P" ^0 E9 M1 b" o+ p
SELV circuits shall be insulated from accessible conductive parts by insulation according to
! T9 D6 x0 P# Y* [( kTable 6 in 15.4.5.3 P l: ?2 a2 D4 }! y
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