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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。% _" }( }; V3 \
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
7 C5 b Y8 v1 G: o1 _; s还请各位大佬解惑,谢谢!
# j8 T; X( q# _0 h5 j" O: {/ U( x( Niec 61347-1 15.43 Q8 ^3 E9 P+ ]( n# f) B
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NOTE At present on the market the following types of control systems are available:( q P0 N" {! r! q6 @5 c
– FELV control signal, basic insulated to LV supply (e.g. Digital Addressable Lighting Interface and 0 to 10 V);
- Z; T( J* l; V. R7 P– SELV control signal, (e.g. DMX);( q& e/ ~! P; m7 q' a
– control signal, not insulated to LV supply (e.g. Push button control/phase cut/step dim).
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The voltage in the circuits shall not be higher than the limits defined for ELV.
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9 s! ~) h& P" e0 D. A" A) F' FSELV circuits shall be insulated from the LV supply by double or reinforced insulation (based
" e) s( P7 U. Iupon a working voltage across the insulation).% t. p, G9 \# h6 `9 S
SELV circuits shall be insulated from other non SELV circuits (except FELV) by double or1 b2 D1 f6 s3 d0 g9 O8 |
reinforced insulation (based upon a working voltage equal to highest voltage in the circuits).
/ S' f2 ] s% b; w M+ Y: y% mSELV circuits shall be insulated from FELV circuits by supplementary insulation (based upon5 H& I( m7 r& s- g+ U- G& A' w, X' u
a working voltage equal to LV supply voltage).
$ S0 V3 U' Z# S& K7 B( uSELV circuits shall be insulated from other SELV circuits by basic insulation (based upon a
% O/ L7 a$ b( t: N1 Cworking voltage equal to highest voltage in the circuits).- g' H; A; I( T; K& g8 p' U
SELV circuits shall be insulated from accessible conductive parts by insulation according to
7 d) v' e3 }5 y1 d# l8 |8 Y9 iTable 6 in 15.4.5., T. D" F$ n' I N. l
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