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Small Bi-polar SSTC

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Dr. Drone
Tue Nov 21 2006, 04:25AM Print
Dr. Drone Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
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Dr. Drone
Mon Nov 27 2006, 03:36PM
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Wed Dec 06 2006, 01:06AM
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Fri Dec 08 2006, 02:41AM
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Wed Dec 20 2006, 10:00PM
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Dr. Drone
Mon Jan 08 2007, 03:34AM
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Marko
Mon Feb 12 2007, 08:52PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
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It's simply so perfect.. I had little to say about it.

Audiomodulation by frequency shifting seems hard on FET's since they go out of soft switching. This can ofcourse be solved with external diodes.

If you want to experiment (you would be the very first to do that on such bi coil) you could try to use a modulated buck/buck/boost converter/class D amp to modulate the supply rails directly.. I guess only imagination limits you there. smile
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Avalanche
Mon Feb 12 2007, 09:12PM
Avalanche Registered Member #103 Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
wrote ...
you could try to use a modulated buck/buck/boost converter/class D amp to modulate the supply rails directly.. I guess only imagination limits you there.

Definitely the way forward for serious sstc audio modulation - a few months ago when I was playing around with making my own inverter it turned into an audio modulated power supply for that purpose. I wasn't going to mention anything about it until I got it beyond the breadboard and to the 'impressive' stage, but that never happened. I think it was more impressive with a function generator hooked up, to produce insanely loud triangle waves. Maybe one day I'll get it running again and revive the project thread!
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ragnar
Tue Feb 13 2007, 01:24AM
ragnar Registered Member #63 Joined: Thu Feb 09 2006, 06:18AM
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Posts: 1425
You wouldn't be the first to modulate the rails -- even for my really old audio-modulated current-fed push/pull flyback mess, I used a FET, source-follower, for audio modulation. I also used it on my very first ever coil, but quickly learned that I didn't have any heatsinks big enough. wink

The great thing about a pulse-width modulator supply is it can serve two purposes; A) to step down the voltage from the mains, if you're running a resonant switching topology (e.g. class-E amplifier, where voltage across the MOSFET is equal to pi * Vin, MINIMUM) and B) of course, proper rail modulation for audio.

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Marko
Tue Feb 13 2007, 12:34PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
you wouldn't be the first to modulate the rails

I didn't say that, but he would be the first to do it on really big coil (afaik, waverider also sucessfully modulated his 6Mhz coil that way).

I'm not sure wich topology would be best, maybe a buck/boost since it can also give higher output voltage (if more power is wanted).

I would just modulate the comaprator input of a PWM IC, without any feedback and use small smoothing capacitor.

Big input filter cap would worsen the PF, if anyone actually cares about it...
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