Author Topic: Ignitron trigger drive ideas?  (Read 300 times)

Offline klugesmith

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Ignitron trigger drive ideas?
« on: April 15, 2024, 09:06:42 PM »
At electronics flea market yesterday, I got an ignitron to play with.   The uncommon glass envelope lets us see the mercury, and will let us see the plasma glow.  Tube might serve as an acoustically quiet switch for my old can crusher, subject to concerns about peak current and current reversal.
Does anyone here have hands-on experience with ignitrons, and high voltage pulsers to drive the igniter pin?

Offline Twospoons

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Re: Ignitron trigger drive ideas?
« Reply #1 on: April 15, 2024, 11:02:05 PM »
What a beautiful thing! I was puzzled by the oval electrode at the bottom, then I realised its a puddle of mercury  :o
Looking at the plasma might not be too healthy for your eyes, depending on what kind of glass was used.

The wikipedia article on ignitrons would suggest a reasonably high current ignition pulse is required - probably similar to driving a big thyristor.
 
Oh look - a nice datasheet!
https://frank.pocnet.net/sheets/119/n/NL1001.pdf
So the trigger appears to need 200 volts, and a peak current to at least 30A.   To me this looks like cap charged to about 300V with a series inductor to control peak current and a thyristor switch. And a diode across the ignitron trigger to prevent reverse volts.

Doesn't handle as much current as I thought it would for something that big.


Offline huntergroundmind

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Re: Ignitron trigger drive ideas?
« Reply #2 on: April 24, 2024, 02:51:23 PM »
Beautiful one :D I used GL5552A ignitron in discharge circuit. It performed quite well. Discharge current was about 600A, voltage ~2,5kV, and capacitors stored energy of about 5kJ. Discharge had no current reversal. I used diy pulse transformer (as far as I remember- 1:2) with thyristor and capacitor discharge circuit. On secondary side it had damping resistor and diode parallel to ignitor to prevent reverse voltage(not visible on photo, placed under epoxy laminate board on the left, string of four 1n5408) . trigger pulse discharge time was about 100usec.
« Last Edit: April 24, 2024, 02:54:01 PM by huntergroundmind »

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Re: Ignitron trigger drive ideas?
« Reply #2 on: April 24, 2024, 02:51:23 PM »

 


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