With this basic highlights we can discuss a little bit how the amplifier works.
A- Power transformers: they are connected to the battery positive +12V (or any voltage in the 8-18V range) and to the Power supply FETs, which will open and close (controlled by the microprocessor) and generate an AC voltage on their outputs.
B- Power Supply FETs: explained on A. Each one is rated at 202A continuous, but they can handle up to 4x this number by working pulsed. Working in PWM mode, the time they stay opened changes all the time in order to control the power supply voltage and not damage the output stage. This is why our amplifiers work from 8V to 18V or even more.
C- Power diodes: Just as in a alternator, they rectify the alternating voltage into DC voltage.
D- Capacitor bank: Provide the capacitance needed to eliminate the pulsating ripple. After the Capacitors the voltage on the SD12kD can be up to 250Vdc.
E- Output FETs: 16 units working in H-bridge mode (means that all voltage RMS from power supply is provided to the load). Being a D class amplifier they work in PWM mode to build a sine shaped signal.
F- Current detection: shunt resistors measure the current from the power supply and send the information to the brain of the amplifier, the 20MHz microprocessor. If a short-circuit occur on the output, the microprocessor shut down the power supply, as an example.
G- Output filter: Being a low-pass filter, it will clean the high-frequency modulating signal from the output stage, allowing only the audio-range signal to pass.
H- Microprocessor and drivers, together they control all the switching devices (FETs) and monitor the protections.
-------------------- TEAM DB UNIT (Master Yoda) 2006 Competition Only Hardcore Points Champion 2006 Competition Only Trunk Stock Points Champion 2007 Competition Only Trunk Stock Points Champion 2008 Competition Only Overall Points Champion http://www.competitiononly.com/ Authorized Second Skin Dealer www.secondskinaudio.com [IMG]
quote:Originally posted by murilo@soundigital.com.br: Hello
With this basic highlights we can discuss a little bit how the amplifier works.
A- Power transformers: they are connected to the battery positive +12V (or any voltage in the 8-18V range) and to the Power supply FETs, which will open and close (controlled by the microprocessor) and generate an AC voltage on their outputs.
B- Power Supply FETs: explained on A. Each one is rated at 202A continuous, but they can handle up to 4x this number by working pulsed. Working in PWM mode, the time they stay opened changes all the time in order to control the power supply voltage and not damage the output stage. This is why our amplifiers work from 8V to 18V or even more.
C- Power diodes: Just as in a alternator, they rectify the alternating voltage into DC voltage.
On a more serious note......
Ok, knowing very little about how the internals of an amplifier actually work I have a question about the input stage.
Unless I'm reading this incorrectly you take the DC current from the battery, turn it to AC current with the input FETs and then use the diodes to turn it back to DC current?
What's the point of this? Why do you want to go DC-AC-DC ... why can't you just use the initial DC input?
-------------------- Team 2loud4you Stef's Crazy Team International Posts: 4599 | From: Ottawa, Ontario, Canada | Registered: Jan 2003
| IP: Logged |
posted
is it possible to post some pics of the parts your talking about for us simple people? some I know but some, I have no idea about or what they look like.
Just a question from a bonehead in the fareast! lol
--------------------
Team D.I.Y TEAM MAXXSONICS (Feel the Power!) TEAM Cactus Sounds (Japan) LFG Fareast. He may not come when you want but, he's always right on time! Posts: 1878 | From: Fukushima, Japan | Registered: Mar 2005
| IP: Logged |
quote:Originally posted by murilo@soundigital.com.br: Gavin the picture is there, can you see now?
Murilo, your on point my friend. Now I know what I'm looking at and what people are talking about! thanks again.
--------------------
Team D.I.Y TEAM MAXXSONICS (Feel the Power!) TEAM Cactus Sounds (Japan) LFG Fareast. He may not come when you want but, he's always right on time! Posts: 1878 | From: Fukushima, Japan | Registered: Mar 2005
| IP: Logged |
quote:Originally posted by murilo@soundigital.com.br: Hello Luka, 250V. Very good.
Murilo...how much of that voltage in lost at the n-channel output mosfets,with the amplifier loaded down?
-------------------- MR. SEARS (LOUD) LIL WHITE CAVY TEAM HIGH X-CURSION STEVE(TEAM CAPTAIN) TEAM DD 2009 SS-NW AND STREET C(THEY'RE HERE) 2008 TRUNK MODIFIED WORLD RECORD HOLDER (153)12v certified legal TL 2008 2007 PRO TRUNK WORLD FINALS (150.9<150.2)12v 2006 PRO TRUNK 1x WORLD RECORD HOLDER(151.2)12v 2005 NSPL TRUNK STOCK WORLD RECORD HOLDER(148.1)12v 2005 1x NSPL TRUNK STOCK WORLD CHAMPION 12v 2004 2nd PLACE TRUNK STOCK WORLD FINALIST (141.6)12v 1989 Installed my first system Posts: 1590 | From: Elizabeth City,NC | Registered: Feb 2006
| IP: Logged |
nice clean amp too. you can tell it is a highend amp too with no jumper wires...
Posts: 6724 | From: north rose,ny | Registered: Aug 2002
| IP: Logged |
posted
Luka all that voltage helps the performance on higher impedances.
Like on this example:
People, don't think the design is simple, without the microprocessor the PCB would be full of secondary circuits, like SMPS control, protection detection, etc etc.
posted
is there this effect on music too? even if you have wired subs at 1R, and you could be driving 3R or more, at some freq, probably this changes a lot, from 20 to 100Hz
Posts: 30 | From: SLO | Registered: May 2009
| IP: Logged |
posted
so murilo... what is the current draw on the 16 k you have at 1 0hm? how many batteries am i gonna need?
Posts: 6 | From: denver, co. | Registered: Sep 2009
| IP: Logged |
-------------------- Dustin Page 97 explorer (TOTALLED) 155.8 Team Deaftraps
81 malibu wagon 160+ bassracer--debuting spring 2010
DO NOT DO BUSINESS WITH H&K KENT. HE RIPPED ME OFF FOR OVER $2000. STAY AWAY! Posts: 1128 | From: abbotsford, bc, canada | Registered: Oct 2005
| IP: Logged |
-------------------- In Loving Memory, David Alfaro
2009 US.Top Cert.St C 158.7 2008 US.Top Cert.St C 158.4 2008 25-48NW NSPL World Champion 2007 U.S.Top Cert. Street A,B,C 2005 Db Drag St A World Champion 2004 Db Drag US.record 642 points 2003 Db Drag Points World Champion http://www.maxxsonics.com/
Back in 02 my girlfriend said I had to make a choice between her and DB Drag....I told that b-tch I've made harder decisions at the Coke machine. Posts: 4858 | From: Suitland,MD USA | Registered: Sep 2001
| IP: Logged |
![[Confused]](confused.gif)
![[Big Grin]](biggrin.gif)
![[Blob]](graemlins/blob.gif)
![[Alien]](graemlins/alien.gif)
![[Wink]](wink.gif)
Printer-friendly view of this topic