Hello,
Please help us with our lamp which sometimes fails to correctly interpret DALI signals that are sent to it.
We have an offline, non isolated 150W LED lamp which is DALI dimmable.
In fact, whilst in the factory, before we ship the product, we send it a DALI signal which tells it what power level to start at, when its installed by the customer.
However, in the factory, when the mains cable running to the lamp was long, the lamp would not correctly interpret the DALI signal. When we shortened the mains cable, the lamp would correctly interpret the DALI signals.
The attached pictures show the setup which does not work, and the setup which does work.
It is inconvenient for us to use the short mains cable. What can we best add to the “long mains cable” setup to make it work?
I was thinking of passing the mains cable through a high permeability ferrite torroid several times just before it enters the lamp. Would this be best?
(incidentally, the lamp has a small 1W Buck converter bias supply, but the LED drivers operate in linear mode. The Buck converter has a differential mode CLC filter before it. There is no common mode filtration. That is, no Y capacitors and no common mode choke in the lamp. In fact, on the lamp PCB, upstream of the mains rectifier bridge, there is no filtration components at all, either diff mode or common mode.)
Please help us with our lamp which sometimes fails to correctly interpret DALI signals that are sent to it.
We have an offline, non isolated 150W LED lamp which is DALI dimmable.
In fact, whilst in the factory, before we ship the product, we send it a DALI signal which tells it what power level to start at, when its installed by the customer.
However, in the factory, when the mains cable running to the lamp was long, the lamp would not correctly interpret the DALI signal. When we shortened the mains cable, the lamp would correctly interpret the DALI signals.
The attached pictures show the setup which does not work, and the setup which does work.
It is inconvenient for us to use the short mains cable. What can we best add to the “long mains cable” setup to make it work?
I was thinking of passing the mains cable through a high permeability ferrite torroid several times just before it enters the lamp. Would this be best?
(incidentally, the lamp has a small 1W Buck converter bias supply, but the LED drivers operate in linear mode. The Buck converter has a differential mode CLC filter before it. There is no common mode filtration. That is, no Y capacitors and no common mode choke in the lamp. In fact, on the lamp PCB, upstream of the mains rectifier bridge, there is no filtration components at all, either diff mode or common mode.)