Load sensing circuit

It is possible the supplies are expecting the inductive load as part of an output series resonant circuit as commonly used in electronic ballast circuits...then you get no output without it.

"Fred Bloggs"

Inductive lamps are not.

The full name is " inductively coupled, electrodeless, gas discharge lamp ".

....... Phil

The OP says the lamp requires a socket with a "coil"- that coil is almost a certain necessity for the driver circuit, itself a half bridge series resonant architecture...

"Fred Bloggs"

YOU are making wild guesses.

A series resonant cct is non inductive at resonance.

It ain't a ballast.

Go away.

..... Phil

So I should try winding an air coil and keep adding turns until something clicks?

Where should I start, given the rated 2.5MHz output of the SMPS?

Ed Williams

Oh, I just noticed from specs the lamp socket/coupling has a cylindrical ferrite core built into it. I suppose then I can wind a coil onto this, ping it with a 2.5MHz signal and watch the CRO for resonance.

Ed

It's no secret how these drivers operate as there is a copious amount of information published in the application notes and patents. They are all in fact half bridge series resonant oscillators. Too bad for you, you do not regulate the dissemination of the scientific and engineering literature, so that, unlike the clueless adolescents and newbies you habitually attempt to bully with your superficial and non-informational pretense of expertise, we do not have to rely on you in the slightest.