LED 驱动 不同电路之间隔离问题
各位大佬，求指点，最近遇到 一款带有 调光功能的 LEDSELV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。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
还请各位大佬解惑，谢谢！
iec 61347-115.4
NOTE At present on the market the following types of control systems are available:
– FELV control signal, basic insulated to LV supply (e.g. Digital Addressable Lighting Interface and 0 to 10 V);
– SELV control signal, (e.g. DMX);
– control signal, not insulated to LV supply (e.g. Push button control/phase cut/step dim).
The voltage in the circuits shall not be higher than the limits defined for ELV.
SELV circuits shall be insulated from the LV supply by double or reinforced insulation (based
upon a working voltage across the insulation).
SELV circuits shall be insulated from other non SELV circuits (except FELV) by double or
reinforced insulation (based upon a working voltage equal to highest voltage in the circuits).
SELV circuits shall be insulated from FELV circuits by supplementary insulation (based upon
a working voltage equal to LV supply voltage).
SELV circuits shall be insulated from other SELV circuits by basic insulation (based upon a
working voltage equal to highest voltage in the circuits).
SELV circuits shall be insulated from accessible conductive parts by insulation according to
Table 6 in 15.4.5.
这块板子上的变压器是输出 共地的， 两路输出 电路之间也是有交叉的，如果加入隔离，这个板子就废掉了 2个变压器不代表是2个SELV电路，从图上看明显是一个SELV电路，因为是用的一个绝缘系统，你可以去争取的 从你的图示来看，这确实是两个系统。虽说标准这个要求乱糟糟瞎来，但是道理还是有的，只不过属于用牛刀杀鸡了，对大多数灯具是灾难 参照其他的标准来说，如果地是保护地，那这两个电路就是PELV电路，SELV的要求就可以豁免。
可不可以不共地，重新布板。 主要是为了防止SELV之间的相互干扰吧，比如一个坏了变成强电，污染了另一个
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