RE: audio modulated SSTC

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "David Trimmell" <humanb-at-chaoticuniverse-dot-com> 

Herwig, didn't you work on a very large audio modulated VTTC some years
back? I think I have the right guy, if so how did it fair?

Regards,

David Trimmell

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, February 05, 2004 7:16 AM
To: tesla-at-pupman-dot-com
Subject: RE: audio modulated SSTC

Original poster: herwig.roscher-at-gmx.de


Daniel, Jan, Finn, Jim, David and all, who helped,

Thank you very much for your quick assistance. I have gained a lot of
insight. In order to summarize:

1. Push-pull-/single-ended-mode of TL494 controller:
      I understand, that these are control modes only and have nothing
      to do with audio modulation itself. Push-pull-mode may be used to
      reduce the power, dissipated in the switching components.

2. Audio modulated self-resonant systems: My fault was, that I
      assumed special problems while using  *digital* modulation.
      "Actually self-resonant systems just keep the phase difference
      between drive signal voltage and TC current draw at zero
      degrees." The advantage of self-resonant systems should be their
      relative insensibility to changes of the secondary coils natural
      frequency.

3. Driving the resonator digitally:
      I learnt, that it is possible to drive the secondary coil not
      only with sine waveshapes (as in "conventional" systems) but with
      digital waveshapes as well. "A unique property of driving a
      resonant load with a stepped voltage at it's resonant frequency
      is, that it automatically aligns to zero current switching."

Again any answers and comments are very welcome.

Herwig












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