Switched Mode Power Supplies (SMPS) - Page 4 - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Inactive Vendor Forums > Connexelectronic

Connexelectronic Commercial Vendors large & small hawking their wares

 
 
Thread Tools Search this Thread
Old 26th May 2010, 01:48 PM   #31
Cristi is offline Cristi  Europe
diyAudio Member
 
Join Date: Dec 2008
Location: Dortmund+Shenzhen
for this version, fixed auxilliary voltage, +-20V.
__________________
www.connexelectronic.com complete assembled amplifier and SMPS
 
Old 15th June 2010, 07:19 AM   #32
TCx is offline TCx  Czech Republic
diyAudio Member
 
Join Date: Apr 2010
Hi, does A350SMPS allow minor output voltage adjustments? I think about using it with two different amp boards where one needs about +-31V and the other about +- 34V and I want to get max. possible output power.
My idea is that I would order one A350SMPS with nominal output voltage let's say +-32V with adjustable output voltage range let's say from +-29V to +-35V? Is that possible? Thank you.
 
Old 16th June 2010, 06:16 PM   #33
Cristi is offline Cristi  Europe
diyAudio Member
 
Join Date: Dec 2008
Location: Dortmund+Shenzhen
The A350SMPS and A500SMPS has unadjustable output voltage, they use Q-R topology with 50-50% duty cycle.
if you need adjustable output, i recommend the A250SMPS which can provide more than 350W peak, or if you need more power, the SMPS500R, which use LLC resonant topology and the output voltage is adjustable within +-10% of the nominal voltage. for example, the 32V nominal output voltage can be adjusted within +-29 to +-35V range. it also have an auxilliary output of +-12 to +-20V .
__________________
www.connexelectronic.com complete assembled amplifier and SMPS
 
Old 18th June 2010, 07:42 AM   #34
diyAudio Member
 
Join Date: Apr 2003
Location: Melbourne
Hi Cristi,

can you recommend SMPS for 4702 based amps (100W) ? How does one obtain required +/-60V as well as +/-52V DC from SMPS ? I'd like to power 4x100W amps (two boards) in total from one SMPS if possible. It does look like 500R is the one to go for, but I'm still not sure about twin voltages required.

Thanks,
Bratislav
 
Old 18th June 2010, 08:37 AM   #35
Cristi is offline Cristi  Europe
diyAudio Member
 
Join Date: Dec 2008
Location: Dortmund+Shenzhen
Suitable SMPS's to supply the LM4702 amplfier can be A350SMPS, (one amplifier board) but the drive voltage might need to be taken from the main voltage, or the SMPS500R, which has also 2 auxilliary voltages, and they can supply the driver part of the amplifier. one smps can supply two boards, but at full power it might face clipping or overcurrent premature trip. this because the class AB amplifiers have the efficiency somewhere arround 60% and at 400W total output power this means about 670W peak drawn from smps.
for best performances, i recommend to use two SMPS500R, one for each amplifier. in this way the maximum power on each channel can also be increased up to 130W.
__________________
www.connexelectronic.com complete assembled amplifier and SMPS
 
Old 18th June 2010, 09:56 AM   #36
diyAudio Member
 
Join Date: Apr 2003
Location: Melbourne
Thanks! So if I understand correctly, 500R can provide all the voltages needed, and that is great news. No more heavy amps for me (my 2x100W class A monster is 40kg+)!
I will never run the continuous full power from all 4 amps (they will be for active open baffle speaker), so there is no chance of overload. The max power might be drawn for 2 bass units, but even then only for short peaks, as open baffle drivers can easily be overdriven.
 
Old 19th June 2010, 04:30 PM   #37
TCx is offline TCx  Czech Republic
diyAudio Member
 
Join Date: Apr 2010
If I wanted to feed the MOS version of the LM4702 amp by SMPS500R then I should connect +AUX voltage in series with the main + voltage and -AUX with main - voltage to get the higher voltages for the driver?
In particular, I would order +-50V version of SMPS500R and adjust its main voltage to +-52V and use LM7808 and LM7908 to lower the +-20V AUX voltages to +-8V and connect them in series with the main voltages to get +-60V for the driver. Is my understanding correct?

If I used +-60V A350SMPS and used the same +-60V voltage for both driver and output stages, would it have any negative influence on the sound quality or anything else?
 
Old 20th June 2010, 04:50 AM   #38
Cristi is offline Cristi  Europe
diyAudio Member
 
Join Date: Dec 2008
Location: Dortmund+Shenzhen
I do not recommend to connect the aux. in series with the main voltages. fist, because is not possible, the Aux. is a differential voltage which have a common GND, then, even if it would have a separate GND, the voltage could be be floating as the main voltage rail consumption increase.
I recommend the following configuration: if you need +-52V for the main voltage, then on the Aux. can get +-62V without using any external regulator. this voltage ratio is given by the transformer turns ratio, in this case the main voltage winding could have 2x5 turns, and the aux. 2x6 turns. it mean about 10.5V per turn.
If you really want to do-it in the way which you explained, then the best approach will be to use the linear regulators, such as LM317/337 AFTER the series connection of the aux. and the main rails. in this way, if there is any voltage fluctuation the regulators will eliminate. why i say to use the LM317/337 instead of 78xx ? simply because they are nor referenced to GND directly, but through voltage divider, and this will not expose them to higher voltage than they can withstand. the LM78xx must be referenced to GND, so this will destroy them since the input voltage is much larger than they accept (usually 3V + Vout). still remain a delicate situation if you short the voltage rails to GND or the opposite rail. this can destroy the regulators.
__________________
www.connexelectronic.com complete assembled amplifier and SMPS
 
Old 20th June 2010, 10:29 AM   #39
TCx is offline TCx  Czech Republic
diyAudio Member
 
Join Date: Apr 2010
Thank you for detailed explanation, Cristi.
Actually, I do not insist on any particular solution, I am just trying to find out optimal solution. Provided I want to feed your MOS version of LM4702 based amp module by one of your SMPS, which one would you recommend and how shoud they be connected and set up to achieve optimal results?
I prefer not doing changes of number of turns of transformer windings and similar not so easy modifications. Thanks.
 
Old 22nd June 2010, 01:44 PM   #40
fb is offline fb  Australia
diyAudio Member
 
Join Date: Apr 2005
Location: Brisbane, Aus
Cristi, is it possible to run the BIPS modules off the AUX out of the SMPS500R? Would 3x BIPS exceed the 0.5A max current?

Thanks
 

 


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
switched-mode power suppies Dimitar13 Everything Else 0 19th February 2008 12:50 AM
PFC Switched-Mode Power Supply N-Channel Power Supplies 57 13th June 2005 07:56 PM
Switched mode power supply MMicke Car Audio 3 19th February 2005 10:42 AM
Switched mode power supplies Magura Parts 13 3rd January 2004 05:44 PM
Switched Mode vs Linear Power Supply royalmp2001 Solid State 4 12th July 2002 08:04 PM


New To Site? Need Help?

All times are GMT. The time now is 07:58 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2