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SvenYou continue to be a great source of inspiration!It is music to hear your success with the transformer.Thank you Hector for steering Sven into the Transvertor experimentCheers Warren
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On Mon, 28 Jan 2019 at 11:45 AM, [email protected] [EVGRAY]<[email protected]> wrote:
Hi Ronald,Thank you for your message. Yes, that's how it works for me as you described it.I have on each leg of the 3-phase transformer 2 equal windings and a larger 3 winding.The 2 windings I steer in push-pull mode, with a square wave frequency of 37-800Hz and fully variable PWM.I start with low frequency and slowly increase the resonance sometime collapses, by increasing the pulse width I can increase the frequency more and more, but also put in more power.Hector created a 10KW ringing with a 3W Pulser, that's my intention.A Q of 160 is awesome because I'm far away. I think Q30 is more than that. I have the opportunity to interconnect the resonant windings for a higher impedance, this would be an advantage, since the voltage then also rises sharply.
The current curve is then no longer so acute, or is it simply because the winding inductance without iron is now larger and the curve looks different.The fact is that I want to operate the Ferroresonanz with the highest efficiency, I was hoping that I could tickle with square-wave voltage and strong sharp tips the transformer stronger than with a sine wave inverter.regardsSven Gesendet: Samstag, 26. Januar 2019 um 11:37 Uhr
Von: "[email protected] [EVGRAY]" <[email protected]>
An: [email protected]
Betreff: Re: AW: Re: Aw: Re: [EVGRAY] Re: Sven's transverter
The Q of a FRT will raise by increasing driving frequency to the point where system nearly drops out of the ferroresonance. Such drop happens suddenly and sharp....-pick-. This part reflects non-linear system behaviour too.Hence if you lost the FR by increasing the driving frequency over the mentioned point, you will have to lower driving frequency again down till near standard resonance frequency...to the point where resonance sets in again, and then increase frequency again to the point where system nearly drops out of the FR condition. This is usually the point where Q is highest. You will not be able to tune into this point that way if your driving system does not provide means for a "stepless" frequency tuning and a continuous (uninterrupted) driving source. The only other way is setting up the target frequency first, then increase input power above rape-limits, till secondary LC is enforced to follow the input frequency in FR mode, and afterwards lower input power to the point where system drops nearly out of the FR condition. But that's rather brutal approach. The more power you drive into the system, the more far you will be able to increase the frequency above the standard resonant (non-FR) condition. Long ago I did tests with a modified HF transformer, taken out of an inverter-MWO, having primary coil H-bridge-driven, magnetic shunt with small air gap and resonant secondary (LC). Tuning into the mentioned point (was for me round about 25 kHz), I was able to drive the system with 21 watts input and got more than 3.4 kilowatts (9.3 Amps at near 370 Volts RMS) FR oscillation in the secondary (Q = 160, if you want to put it like that). Cheers! Ronald
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