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Old 9th July 2013, 01:30 PM   #621
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Hi Christi

Can I get to change the +-12V to +_15V on my A1000SMPS power supplies?

Thanks
 
Old 10th July 2013, 11:44 AM   #622
Cristi is offline Cristi  Europe
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I don't understand. you mean the aux. output ? if yes, can be done by replacing the current regulators, 7812 and 7912 with 7815 and 7915.
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Old 10th July 2013, 12:57 PM   #623
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thanks...that is what i wanted to know
 
Old 19th July 2013, 02:15 AM   #624
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Hi Cristi,

I am building a six channel HT amplifier that uses 6x LM3886 modules. Each modules has 3x LM3886 in parallel and the local reserve is 6600uF per rail (13200uF total per modules) @ +/-36Vdc.

I am using your SMPS2000R PSU. Connecting the first three modules and powering worked extremely well then when adding a fourth module I was starting to get Over Corrent led flash for 2-3 sec then the PSU would kick in no problem. Adding the fifth module worked as well but it was 5-6 seconds of OC but on my last module, the OC light keeps on flashing and PSU does not start. If I turn off the mains power for 3-4 seconds and power back on it start working properly without any issues.

Do you know what could be done to help with this issue?

Thanks
Do
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Old 21st July 2013, 08:14 AM   #625
Cristi is offline Cristi  Europe
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Seems that you experience the phenomenon described in posts #580 and #577. Switched Mode Power Supplies (SMPS)
Your amplifier seems to have a larger total capacitance than can be charged in the very first moments of soft-start sequence. to make things worse, the amplifier also draw a considerable current and discharge the caps till the next start-up try.
there are few sollutions:
first you should try to keep all the amps muted during start sequence and realease the mute after 2-3 seconds when the voltage had settled to nominal value, to decrease a little the quiescent current. of course this method does not deal with the burden of excessive capacitane.
another method, less elegant would be to add an additional soft start circuit, at the output of the power supply, not on the mains side, on each rail. this can be made of two large power resistors, 3-8R and at least 25W, connected in series with the power supply and amplifier and each shorted by a relay once the voltage has reached the nominal value.
Third method, the most elegant but not suggested at all because involves intervention on the power supply, is to increase the soft start ramp time. I would not detail, as it requires extreme care and detailed knowledge and because of dangerous mains voltages present on the board.
You can also try to decrease the capacitance by replacing the stock capacitors of the amplifier board with better ones, and less capacitance. I have no idea what capacitors were used, but I'm almost sure wasn't Panasonic FC's on that boards. you can use 1000uF high quality ones instead of stock caps. being powered from a regulated SMPS so much capacitance won't make things better, expecially if they are cheap (or even refurbished) caps.
please try to activate the Mute function during start-up, this will decrease a bit the quiescent current. to do that, probably you just have to increase the cap connected at pin 8 of each LM3886 for longer Mute time. this depends on the board design of course.
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Old 21st July 2013, 09:44 AM   #626
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Cristi View Post
................... this method does not deal with the burden of excessive capacitane.
another method, less elegant would be to add an additional soft start circuit, at the output of the power supply, not on the mains side, on each rail. .............
A slow charge circuit using a series string of NTC Power Thermistors with a relay bypass, should allow a susceptible protected SMPS to start up.
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Old 21st July 2013, 02:38 PM   #627
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To give you an idea of the setup (this is an older pictures)

Click the image to open in full size.

I might try to reduce all caps to 1500uF instead of 3300uF which is a faster alternative and if the sound is not good then I will add a softstart.

All modules were built by myself and I only chose good components, so everything new from reliable sources like Mouser or Digikey, etc...

Thanks
Do
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Last edited by pinnocchio; 21st July 2013 at 02:40 PM.
 
Old 26th July 2013, 04:55 PM   #628
Cristi is offline Cristi  Europe
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Some progress and good news as well ???
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Old 27th July 2013, 02:03 AM   #629
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Quote:
Originally Posted by Cristi View Post
Some progress and good news as well ???
I have decided to keep all my local Nichicon on the amp modules and to remove all caps from the second bank on the SMPS (10x 3300uF) and replace them with 10x Pana FCs 220uF.

This should work fine since the SMPS is able to charge the 52800uF on four amps plus his own secondary bank of 33000uF. They total 85800uF in total.

If I power 6 amp modules I will have 79200uF + 2200uF from the SMPS which will equal to 81400uF. It should be good.

Let me know if you have any doubts

Thanks
Do
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Old 27th July 2013, 03:49 AM   #630
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If my idea is good to use, would it be better I use Caps with lower ESR or lower Impedance on the second bank of the SMPS2000R?

Nichicon Lower Impedance

Pana FC lower ESR

Thx
Do
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