[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Sold state IGBT disruptive coil spark gap idea



Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Gary,

This is what I think happens and maybe one could calculate the efficiency for 1st, 2nd, 3rd quench, etc. given a set of assumptions.

1. Assume every time energy transfers from primary to secondary (or secondary to primary) about a third of the remainding energy is loss in the sparkgap.
2. Neglect other losses (copper and radiation, etc).
3. Assume it takes a certain energy level (topload voltage) in the topload to cause breakout. 4. Once this streamer forms, assume a certain fraction of the topload energy goes into the streamer. The remainding energy goes back to the primary. This fraction probably changes from one primary notch to another. 5. Also once a streamer forms, it takes a minimum energy level from a subsequent transfer to sustain the streamer and the fraction of energy from this subsequent transfer that goes into the streamer is probably a function of the ratio of transfered energy to minimum sustaining energy.

CASE 1: No streamer formation, since no energy goes into the streamers, all energy is dissipated in the gap. Not an interesting case. Efficiency (streamer energy/initial primary energy) is zero.

CASE 2: Streamer formation - no ground hit: A certain percentage of the energy making it to the secondary will go into the streamer leaving the remainding energy to be transfered back to the primary. One could create a series function to see how many transfers it takes until the existing streamer can not be sustained.. From this, one can figure the ratio of the total streamer energy to initial primary energy (efficiency). One can figure the efficiency for 1st, 2nd, 3rd notch quench, etc, and figure how may primary notches until the streamer is no longer sustained.

CASE 3: Streamer formation - ground hit: I believe all the energy reaching the top load will be quickly dissipated into the arc before the primary has a chance to ring up again so maybe primary quenching is not an issue for this case.

Gerry R.



Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>

As one who's never toyed with DRSSTC's, I have a dumb question that's
probably been discussed previously, but -

What is the performance-consequence to completely eliminating the
concept of quench, and permitting as many pri-sec trades as it wants?

Regards, Gary Lau
MA, USA