| IanS |
Can anyone comment on the new PWM amplifier from 'Power Physics' ?
To quote MIX online (http://mixonline.com/mag/audio_nht_xd_series/):
"Examining the drawbacks of existing PWM (Pulse Width Modulation) digital switching amplifier designs, Power Physics developed a new nonlinear control method (U.S. patent #6084450). This One-Cycle Sound™ approach monitors the switched variable on a cycle-by-cycle basis, so in each cycle, the average value of the output (power to the speaker) equals the control reference (audio input signal). This rejects power supply disturbances, non-ideal switching edges, component variation with temperature and other distortion-creating problems in typical PWM amps."
How might this compare to UcD? |
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| classd4sure |
Hi,
Glad you posted about this, it's been mentioned before and I've been looking for it for weeks ever since I lost everything.
I just did some searching and I wasn't able to find the thread it was brought up in, Bruno had some comments on it, anyone have a link?
Just had a glance at their white paper as well. They claim "soft switching" hmmm... It's the error that hits zero each cycle, not the inductor voltage or current, I may have missed or missunderstood something, I realize they didn't claim ZVS, but how can they claim soft switching, I was under the impression class d audio= hard switched?
Seems funny they got a patent there's nothing new in single pulse control is there?
Thanks |
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| AGGEMAM |
| Absolutely agree. It seems like every old idea can be patented nowadays. Don't the US Patent office bother to check up old research or what? |
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