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Registered Member #286
Joined: Mon Mar 06 2006, 04:52AM
Location:
Posts: 399
"Hmm, what do you mean "DR mode" (DR as in dual resonant? How?)"
I understand that "DR" means that the primery and the secondary are LC circuits setup in resonant mode. If I got it wrong, someone please explain.
After some more experimenting, I have came up with the best circuit so far. I have notice that my primery was getting super hot so I used litz and it still gets hot. I did notice the litz help the "Q" of the primery. Better streamer length. Below is the circuit so far running in parrelel resonant mode. The voltage swings in the primery tank get so high that a neon bulb can be lit by it.
It looks like the design prossess is almost over. All thats left is the interupter. Now for some questions. Would it be better for the coil to be controlled by an oscallator or have primery feed back? Are there such thing as SMT mica capacitors? I have not seen any. Im afraid to use SMT ciramics on the primery tank, because they may burst into flaims!
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Typically parallel resonance isnt used with inverters because you are applying a voltage source that has very high frequency components (square wave). This results in large peak currents every switching transition as your inverter attempts to reverse the charge of the parallel resonant cap.
You really should have a series resonant circuit if you want to go that route, or use a series matching inductor like the LCLR induction heater does.
Registered Member #286
Joined: Mon Mar 06 2006, 04:52AM
Location:
Posts: 399
I have tried to use a series matching inductor but I do not know how to calculate the proper inductance for the circuit.
*****UPDATE*****
I have resolved the h-bridge heating issue and added an interupter. The gates where not being driven to an optimal voltage, they where only seeing +-2.5v I knew about this but since forgot. The GDT was also rewound to efficiently operate at a higher drive voltage. Now the gates see +-10v. I have since blown one IRF510 and one 2SK758 with higher bridge voltage(50v). Now the coil is running with a pair IRF630s. I am surprise that the 2n7000s are running cool when driving all that gate capacitance. Below is a pic showing streamers just oven an inch. streamer
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Micro SSTC design
I knew about this but since forgot. The GDT was also rewound to efficiently operate at a higher drive voltage. Now the gates see +-10v. I have since blown one IRF510 and one 2SK758 with higher bridge voltage(50v). Now the coil is running with a pair IRF630s. I am surprise that the 2n7000s are running cool when driving all that gate capacitance. Below is a pic showing streamers just oven an inch.