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Class D Switching Power Amplifiers and Power D/A conversion

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Old 9th March 2009, 05:27 PM   #11
iand is offline iand  United Kingdom
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Default Re: PKN XD-4000

Quote:
Originally posted by uuv
I have measured the voltage of power supply: 402VDC
The voltage of end-stage is 167VDC in steady-state.
This amp is not sensitive for line changes ( i don't know because of the PFC or not) sometimes we have had very dirty line (~190V instead of ~230V) but the amps working! when the CD players do not :_)

So i am driving 4pcs 18" 1000W/8Ohm subs per amplifier. A pair of subs per side.I always use 4Ohms impedance as a minimum although the amps could go down to 2 Ohms.I do not prefer operation bellow 4 Ohms on this power level due to very high currents, and high cable losses. I have a rack-mount unit with 5pcs of XD-4000, 2for the middle-high and 3for the low section. It is a pretty compact small system. The power draw of this rack is bellow 63A even with strongly compressed heavy-duty musics.

Another thing is that these amps have built-in limiter/compressor system which work very well. It is almost impossible to drive these amps to clipping or distortion.

Finally the most important is the quality of sound of course... we have made several "A-B" compare tests and my amps get very very high results. They have real neutral sound and great dynamics, really powerful bass.
Do you have any measurements for bass frequencies (e.g. 45Hz) instead of 1kHz?

Ian
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Old 13th March 2009, 12:42 AM   #12
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Smile PKN Amplifiers

Dear Sirs,

I ve just heard about that this discussion is exists...It is nice to see an innovative product here, please ask me if you are interested.

PĂ©ter [PKN]
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Old 13th March 2009, 02:01 AM   #13
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Hi, PeterPAPP

Could you share, what is the special aspect of this amp?
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Old 13th March 2009, 10:00 AM   #14
Gyula is offline Gyula  Hungary
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What a coincidence! Peter Papp, one of the designers of PKN. As I now the letter P denominates you in the PKN brand.
Do you know if businesslike advertisement is forbidden at diyaudio.com ?
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Old 13th March 2009, 11:15 AM   #15
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Lets talk about technical stuff of PKN
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Old 13th March 2009, 12:02 PM   #16
iand is offline iand  United Kingdom
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Default Re: PKN Amplifiers

Quote:
Originally posted by PeterPAPP
Dear Sirs,

I ve just heard about that this discussion is exists...It is nice to see an innovative product here, please ask me if you are interested.

PĂ©ter [PKN]
Peter, there's also a (non-DIY) discussion on the PKN amplifiers going on on the UK speakerplans forum here -- you might want to join the forum and post a reply, there's a lot of interest in getting them to the UK.

http://www.speakerplans.com/forum/A-...opic24766.html

Ian
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Old 13th March 2009, 12:11 PM   #17
iand is offline iand  United Kingdom
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Quote:
Originally posted by lumanauw
Lets talk about technical stuff of PKN
Unless anyone knows different, I think this is the only class-D amp using a resonant (instead of hard-switched) SMPS.

Resonant supplies are usually avoided because the design is a lot more difficult than hard-switched SMPS, especially to work over a wide and rapidly varying load like an audio amplifier -- if they ever leave the correct mode of operation and get into a hard-switched mode they tend to blow up...

It would be interesting to know the reasons for choosing a resonant supply, possible ones that spring to mind include:

higher switching frequency ==> smaller transformer, higher power
lower noise emissons (EMI)
lower losses (no diode reverse recovery)
can use slower-switching MOSFET/IGBT (lower Ron losses)

Maybe Peter can comment?

Ian
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Old 13th March 2009, 02:08 PM   #18
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QSC PL380

ECLER DT6800

HOTSOUND PRO DIGILITE 8.0

CROWN I-TECH

All these Class-d amps have resonant/quasi-resonant SMPS in them...........
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Old 13th March 2009, 02:35 PM   #19
iand is offline iand  United Kingdom
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Quote:
Originally posted by Workhorse
QSC PL380

ECLER DT6800

HOTSOUND PRO DIGILITE 8.0

CROWN I-TECH

All these Class-d amps have resonant/quasi-resonant SMPS in them...........
"Quasi-resonant" usually just means delayed switch turn-on to try and get lower switching losses, some companies also call this "resonant" which is not really correct.

A true resonant supply uses series LC on the primary side to form a resonant circuit, the stage then acts as a lowpass filter clocked above resonance with sinewave output current and voltage, gain is controlled by changing frequency (switches are always 50:50 duty cycle).

QSC PL380 is definitely *not* resonant (no L, no resonating C)

ECLER DT6800 -- says "resonant structure", no evidence either way

HOTSOUND PRO DIGILITE 8.0 -- quasi-resonant

CROWN I-TECH -- can't find any info, but I'll bet it's Q-R

Back to you... :-)

Ian
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Old 13th March 2009, 03:18 PM   #20
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You again assumed too much.............

well majority of them are quasi resonant or discontinuous resonant mode

what you are mentioning is continuous resonant mode by varying frequency.

PL380 has L in series with primary, though the L is etched on pcb itself. cos the leakage inductance of trafo is already high.

Ecler has seperate L in series of primary , go and have a look inside that amp

Digilite again has L in series like others, look inside it

Crown i-tech has dual resonant tank LC in series with primary...........
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