small Xenon XBO lamp
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- Опубліковано 10 вер 2024
- This is a small Xenon 180W XBO lamp normally used in medical equipment. These are specialist lamps and not related to car headlamp, so called xenon lamps which are actually halide lamps. Although new it wouldn’t work. On investigation it looks like it was connected in reverse bias causing the cathode to be damaged instantly. This has changed the lamp’s operating specifications to the point it wont work. I decided to try and get some life out of it so that I could look at the spectral output.
Warning if using head phones: the high voltage spark gapped igniter used in the video produces loud spark.
Finally someone shows how to couple the ignition voltage spike into the main lamp current. That ferrite core 10 to 10 turns magnetically isolates the ignitor. Ingenious man. Diode across smoothing cap completes ignition circuit.. Just got a "BHA - 600r - 32 High pressure mercury long arc" that I'm trying to get fired off. Thanks for showing me how to not fry my "500kV" pulse ignitor lol (30kV).
Quite easy to adjust the pulse voltage, if required, by changing the turn ratio. Some XBO pulse transformers have fewer turns than 10. My experience is not damaging ignitors but blowing the low voltage power supply. One of the reasons I am using a simple DC setup here. :-)
Why thank you. You literally opened up a new world trying to ignite HID lamps.
It's similar to the way some ion lasers are ignited, for example Lexel units.
@@cambridgemart2075 Thanks again for showing us this. Opened up a whole new dimension for myself and someone I'm tutoring. It works flawlessly. So simple. Next hurdle will be getting proper DC power supply involved and the diode in series etc. Currently running 280 UHP Mercury lamp on a 1000 Watt metal halide ballast. 135 Volt lamp voltage (way too high). Need a variac. $$$
You should put the gas discharge tube in the area where it sparks to reduce the danger and reduce noise
Just a quick test set-up to check the lamp.
@@tuopeeks would be very dangerous
Part description please , especially for inductor coil hv
The diagram at 4:45 shows the complete circuit. The high voltage module is of a pulse type found on eBay often claiming 400kV or similar. It’s more like 60kV, but will run from a 3 to 6V dc supply. This is fed into a few turns of wire around a ferrite core to make a transformer. A spark gap is required to achieve the voltage pulse on the coil. The secondary winding is wired in series with the low voltage DC circuit to the lamp. This is effectively a ‘superimposed ignitor’ circuit for starting the lamp. The transformer can be wound 1:1 or 1:2 depending on ease of starting. The diode across the capacitor is to protect the bridge and capacitor from reverse HV spikes.
yikes, glass looks melted, that bulb looks super dangerous now. it was likely designed to run with a lot of cooling!
Yes, in operation this light does need force air cooled at about 3m/s
The tube is made of quartz rather than glass so can run at very high temperatures. It hasn’t deformed from the manufactured shape. It’s not unusual to see the tube glowing red at switch off. The lead-in strip of Molybdenum has most likely fused as it’s melting point is 2,623 °C (4,753 °F). I think the current from the capacitors at start was the cause of the failure and I should have resistor ballasted to limit current, but even so the initial damage meant the lamp was unlikely to work.
"it can get worse" your usual "conservative" description. Brilliant in every way.