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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。
* b3 J- p+ @3 h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 z- f6 P0 V' S0 l' u1 M
还请各位大佬解惑,谢谢!( r% { Q3 m# C! e
iec 61347-1 15.4
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, V) Z$ Q; k' `5 x' t; ]0 |NOTE At present on the market the following types of control systems are available:
: h- x% {, i+ i4 V) V– FELV control signal, basic insulated to LV supply (e.g. Digital Addressable Lighting Interface and 0 to 10 V);
) b/ G- D6 H( n– SELV control signal, (e.g. DMX);
4 R# Q5 l$ V6 p+ T1 t2 z0 a– control signal, not insulated to LV supply (e.g. Push button control/phase cut/step dim).
% ]+ b/ T- Q: a Z% @, A1 p
+ y2 h( ?1 c& d9 R1 zThe voltage in the circuits shall not be higher than the limits defined for ELV.8 Q- d( f2 D% O! t, T" l3 y3 Q6 a
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SELV circuits shall be insulated from the LV supply by double or reinforced insulation (based9 t; J- M% I& K" {6 O( Q5 c
upon a working voltage across the insulation).
( t, j( p; J/ H- I8 o. U3 ~4 @1 ^SELV circuits shall be insulated from other non SELV circuits (except FELV) by double or
3 O1 v, S6 L/ l$ rreinforced insulation (based upon a working voltage equal to highest voltage in the circuits).) J+ {2 Q: o! X7 e
SELV circuits shall be insulated from FELV circuits by supplementary insulation (based upon
$ }5 M% b/ [3 fa working voltage equal to LV supply voltage).5 A! T+ z# E1 w: d
SELV circuits shall be insulated from other SELV circuits by basic insulation (based upon a
1 r1 e' f& \& {2 v6 ^; m1 Y9 j4 q( fworking voltage equal to highest voltage in the circuits).* |# W6 r" j8 D3 @3 [- X1 P! L
SELV circuits shall be insulated from accessible conductive parts by insulation according to4 P H7 q2 [, N( T# c; G) H+ d
Table 6 in 15.4.5.
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