Series inductance of Glow Diodes. - Mark Kelly

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Series inductance of Glow Diodes.

Posted by Mark Kelly (M) on September 1, 2002 at 23:26:05

I have posted before about glow diodes and amongst the few responses was one questioning the high level of equivalent series inductance (about 4mH for a 0D3)which I had calculated for these things.

This got me thinking, as I couldn't see where it came from either, but serendipity struck again on Thursday. I was reading my newly acquired copy of E.L.Chaffee's "Theory of Thermionic Vacuum Tubes" (1933)and I came across a reference to the effective momentum of electron and ion current in V/Ts.

With normal V/Ts this is not a problem as the momentum is very low due to the electron charge to mass ratio being so high. The presence of gas changes the picture totally as the gas ions have considerable momentum. Momentum is resistance to change in velocity, which translates to change in current flow (for a flow composed of charged particles). Anything which inhibits the time rate of change of current flow shows up electrically as inductance, so this electron stream momentum shows up as the high effective series inductance of the glow diode.

This should also apply to mercury vapour rectifiers. Has anybody measured the ESL of one of these?

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Topic - Series inductance of Glow Diodes. - Mark Kelly 23:26:05 09/1/02 (18)

Re: Series inductance of Glow Diodes. - PÃ¤r 11:10:44 09/3/02 (3)

TNX both (nt) - PÃ¤r 22:30:06 09/3/02 (0)

Re: Series inductance of Glow Diodes. - dave slagle 17:34:22 09/3/02 (0)

HF performance - Mark Kelly 16:12:18 09/3/02 (0)

Re: Series inductance of Glow Diodes. - fatbottle 05:26:04 09/3/02 (0)

Re: Series inductance of Glow Diodes. - palomarjack 14:01:18 09/2/02 (5)

Relevance at AF - Mark Kelly 16:39:49 09/2/02 (4)

Re: Relevance at AF - Paul Joppa 14:00:29 09/3/02 (3)

Implementation - Mark Kelly 16:15:55 09/3/02 (2)

A thought - Paul Joppa 10:53:27 09/4/02 (1)

Re: A thought - Mark Kelly 17:32:52 09/4/02 (0)

Re: Series inductance of Glow Diodes. - dave slagle 13:51:56 09/2/02 (6)

Constancy of inductance - Mark Kelly 16:42:08 09/2/02 (4)

C with RC damping won't be very sensitive to inductance changes. - VoltSecond 21:36:41 09/3/02 (3)

De-Qed glow diode - Mark Kelly 22:35:05 09/3/02 (2)

Re: De-Q'ed glow diode - VoltSecond 18:02:43 09/4/02 (0)

Oops - Paul Joppa 10:57:29 09/4/02 (1)

Yes, very cool stuff to consider <nt> - Jim Dowdy 14:43:14 09/2/02 (0)

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