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Class D Switching Power Amplifiers and Power D/A conversion

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Old 11th December 2007, 09:06 PM   #11
ajazz is offline ajazz  India
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Should be on Variacs "Class D design issues"
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Old 12th December 2007, 04:15 AM   #12
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Ajazz, you think that you are so smart and others so dumbs... ok...
But do you not understand my description in first post and not bothering to look at my photo. Where is my deadtime Ajazz?... Do you understand? People like you, dream at BCA and other stuff, but not understand sufficiently the basic half bridge... hmm maybe only a schematic will satisfy you...

LE: Do you think that QSC PL380 (in my opinion the state of the art) is anything else than half bridge? ....
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Old 12th December 2007, 04:57 AM   #13
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Quote:
Originally posted by ajazz
Today there is nothing great in designing a Half-Bridge circuit using self oscillation or synchronised version
I would appreciate some different & better topologies to be discussed on this forum like DIY
If there is nothing great in conventional half-bridge topology as compared to BCA , then i think you surely lack the perspective vision towards innovation with respect to present day of high-speed semiconductor availability......
BCA is an older technology, which stands nowhere in present day scenario, times have changed
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Old 12th December 2007, 05:05 AM   #14
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Quote:
Originally posted by ionutgaga
Do you think that my inductor (gapped 2mm 3f3 toroid ferite) is the source of my problem? Or IRFP260N only?

I think 3F3 is not suitable for class-D output inductor. It's a ferrite not an iron powder. Check micrometals.com, they carry a lot iron powder for high frequency filter
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Old 12th December 2007, 05:31 AM   #15
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Indeed, 3f3 is not suitable for class D.
But gapped 3f3?
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Old 12th December 2007, 05:34 AM   #16
Eva is offline Eva  Spain
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Both BCA and phase modulation are actually solutions to the MOSFET body diode charge storage problem and to the lack of really high-performance high-voltage MOSFET transistors.

Nowadays there is a new generation of 150V, 200V and 250V MOSFETs with low gate charge, low Rds-on and fast body diodes. There have been drastic improvements in 600V devices too. These new devices are good enough for half-bridge hard-switching operation with dead time and switching jitter figures approaching zero ns There is no reason for falling back to complex solutions to a problem that is already solved.

Also, I wonder why we have expent so much time and effort with clocked modulators and triangle waves, considering that self oscillating performs just better.
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Old 12th December 2007, 05:41 AM   #17
Eva is offline Eva  Spain
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Quote:
Originally posted by ionutgaga
Indeed, 3f3 is not suitable for class D.
But gapped 3f3?
3F3 is perfect for class D as long as the core is gapped
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Old 12th December 2007, 05:49 AM   #18
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@ Eva
Clocked design, because syncronisation of min 2 ch and power supply in the same chasis; because i have posibility to reduce carrier frequency just by add a notch filter at output. I not trying to think about amplitude of carrier output at level of voltages .+/-120v without a notch....
@ WorkHorse
I tryiet already this techniques...
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Old 12th December 2007, 05:53 AM   #19
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Quote:
Originally posted by ionutgaga
[B@ WorkHorse
I tryiet already this techniques... [/B]
Then what are the results........any difference between series inductor & series schottkys result???
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Old 12th December 2007, 06:05 AM   #20
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Not enough to justify additional cost...
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