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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Proud Mary wrote ...
Patrick wrote ...
Im going to quote my own work, as i think its relevant. (cursor A1 indicates 5.08kV)
You don't specify the secondary load, which, being in series with the secondary, is likely to change things a bit.
Were you to connect a sparking plug in a great big engine block to your coil with the usual resistive suppressor cable, don't you think new complexities would appear in your osciilogram?
Consider what is likely to happen at the spark gap: (1) a streamer phase (2) a spark phase (3) an arc phase (4) an extinction phase
Electrons will be surgingg one way down the cable, and then rushing back the other way, until you get motion sickness just by trying to imagine it all.
"Thine circuit is not of this world," as Jesus used to say.
my purpose was to show those complexities, incase the OP had not cosidered them. also, since i dont know his final setup or detailed purpose i cant really verify the load behaivour. but mine was 50Mohms in that pic.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Patrick wrote ...
my purpose was to show those complexities, incase the OP had not cosidered them
I think you've made a good job of it too.
Here is an interesting if biased blurb on the behaviour of the different species of sparking plug cable, which has much to say about the apparently popular 'spiral wire' aka 'mag wire' where the conductor is wound in a helix around a central inert core to introduce significant inductance. What a bad thing that would be for anyone hoping for a textbook pulse.
Registered Member #4361
Joined: Fri Jan 20 2012, 12:46AM
Location:
Posts: 11
Patrick: The ringing/damping is a function of the Q of the circuit. My load is highly non-linear - starting as an open circuit, then when the process fires, impedance drops abruptly taking most of the energy. I suppose it's like a spark gap in that regard, but has a much longer rise time. For this application, I simply need one HV pulse; anything else is immaterial.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
RonP wrote ...
Patrick: The ringing/damping is a function of the Q of the circuit. My load is highly non-linear - starting as an open circuit, then when the process fires, impedance drops abruptly taking most of the energy. I suppose it's like a spark gap in that regard, but has a much longer rise time. For this application, I simply need one HV pulse; anything else is immaterial.
ok thats fine, just realise many HV sources and loads are often "ugly" when it comes to V-t graphs, and power-time type issues too.
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Need single pulse from ignition coil
