| THREE COIL DRSSTC |
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| Schema components: - ISSTC driver (antenna feedback, 74HC14, UCC 3732x, pulsed with 555 interrupter). - half bridge with IRFP260N FETs (200 V @ 46 A) - 470 uF @ 400 V DC bus cap - 100 vac full rectifyed input - L1 : 4 turns of large diameter, heavy insulated wire (driven directly by the half bridge) - L2 : 10 turns of #15 insulated wire, wound under the turns of L1 - L3 : 960 turns secondary, ~ 400 kHz self resonant frequency L1 and L2 forms a step up transformer ( N1/N2 = 4/10) L2 forms with the capacitor C = 15.5 nF the resonant circuit. The benefits of the setup would be: - free ringing at low resistence in the resonant circuit L2-C, feeding the streamer with more energy, after the end of the burst in the primary coil (L1). A % of the energy pumped by the primary coil in the system will be stocked in the resonant circuit and transferred to the secondary, after the primary will stop conducting. - overcurrent protection for the bridge components, which will not be stressed by the high currents circulating in the resonant circuit. The tests were performed with the same setup, at 100 vac full rectifyed, fixed low duty cycle, fixed low pulse rate. |
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| STEP 1 L1 used as primary for the ISSTC, resonant circuit L2-C disabled (cap not connected ). RESULTS : 6 inches sparks |
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| STEP 2 L1 used as primary for the ISSTC, resonant L2-C circuit enabled. RESULTS: 10-11 inches sparks. The streamers are long and bright. |
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| Weak point: I am not sure if it is 100% tunned, because the thing was made empirically Maibe it is a way to go for a possible DRSSTC made with low current discrete IGBTs. |
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