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Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Hello every one, there has been a lot of talk about QCW lately on the forum and lots of question being asked.
I decided to do a nice well documented page on my experience with the QCW on my new web site. As far as I know I was the first to duplicate Steve Ward's results (This is unconfirmed). with the class D bus voltage modultion
Thank you for doing this. Sharing and documenting our research is what makes us a scientific community. Are you using a PFC boost converter or a rectifier?
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
I finally got around to reading it - interesting article, thanks
I'm looking forward to seeing how things develop in the QCW world, even if I never get around to trying anything properly myself. The audio modulation should be particularly entertaining, if anyone can find any IGBTs that can cope with the abuse
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Thanks for the positive feedback. To answer a couple of question.
No I don't use PFC "yet". I have yet to decided if it would really be worth it to add an extra layer of complexity to this project. Because I can see it know, one 60N60 in the full bridge fails, this shorts the other 60N60 in the half bridge, this puts a dead short on the modulator, shorting all it's 10mF of bus C and kill it, this then puts a short on the PFC and possibility killing it! It's a scary thought, a big domino effect of dead silicon
Audio modulation has already been tried on the QCW by Steve Ward, and the results of very cool! It's just a matter of using only half the audio signal to maintain <50% duty operation.
Man you are going to need one hell of a modulator to do QuadZilla!!!
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Gregory wrote ...
QuadZilla with a modulator will be a beautiful setup.
Eric,
Maybe you can try some OCD at the buck inverter output, before the output LC filter. One 100A shunt can do the job!
Yes I was originally planning on having a LEM100 DC current transducer do the job. But I never got around to adding it. I will most likely implement this in the final design.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Steve, AFAIK Phillip used a ridiculously high voltage on the plate which surely doesn't help the tubes life. Maybe if you used such a high voltage transformer with a standard doubler and a staccato, you could get similar results...
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QCW Documented
