Load sensing circuit

[Ed Williams]

I have several switch mode supplies that are supposed to power a
commercial inductive lamp, via coupling coil/socket, at 2MHz 300VAC. I
do not have the lamps or coupler, but need to use the supplies for
another purpose. However, they show no output on the CRO.

It is unlikely they are all bad. So I am wondering, is it conceivable
the supplies would incorporate some kind of sensing circuit to prevent
operation when not connected to the intended load?

If so, what would be the best bet for getting around this? IOW
simulating the loading of the lamp and its coupler.

Thank you for any suggestions.

Ed Williams

 

[Fred Bloggs]

I have several switch mode supplies that are supposed to power a
commercial inductive lamp, via coupling coil/socket, at 2MHz 300VAC. I
do not have the lamps or coupler, but need to use the supplies for
another purpose. However, they show no output on the CRO.

It is unlikely they are all bad. So I am wondering, is it conceivable
the supplies would incorporate some kind of sensing circuit to prevent
operation when not connected to the intended load?

If so, what would be the best bet for getting around this? IOW
simulating the loading of the lamp and its coupler.

Thank you for any suggestions.

Ed Williams

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.

 

[Phil Allison]

"Fred Bloggs"

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.

** LOL.

Inductive lamps are not.

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



........ Phil

 

[Fred Bloggs]

"Fred Bloggs"




** LOL.

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...

 

[Phil Allison]

"Fred Bloggs"

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...

** The OP is a fool with no clue.

YOU are making wild guesses.

A series resonant cct is non inductive at resonance.

It ain't a ballast.

Go away.



...... Phil

 

[Ed Williams]

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...

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

 

[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

 

[Fred Bloggs]

"Fred Bloggs"




** The OP is a fool with no clue.

YOU are making wild guesses.

A series resonant cct is non inductive at resonance.

It ain't a ballast.

Go away.

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.

 

[Phil Allison]

"Fred Bloggs Arsehole from Hell "

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.

** Go **** yourself - Blog brain.

The OP's question is totally asinine.

So are your wild guesses.

I was smart enough to give him no answer here - rather that a possibly
wrong or harmful one.

Go **** yourself - Blog brain.





........ Phil