Anotherpower.com Forum
The Corner Tavern. => The Bar => General Electronics Discussion => Topic started by: RFburns on September 20, 2019, 01:09:08 am
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SMPS cheap $30Au dollars -sorry for the poor quality- but 196.7A if i can figure out how to defeat the voltage regulation to lift it by a volt or two It will be great.
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Bit more poking around today looks like this is the brain ;but think the bits i am really looking for are on the board behind this one -Bugger!.
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I have similar as my benchtop psu supply, they will usually have two small pots internally the adjust volts and current, but usually to a point ( 13v usually max ive found) to go any further you have to backtrack to the ov protection and disable it. Sorry but each model different, even had 2 the same model with different internals. Also watch the over current protection, it will kick in earlier when you increase voltage ive found.
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Hi Noneyabussiness ,definitely no adjustment pots in this supply unfortunately ;if I can get 13v I'll be happy with that . The regulation is tight in this supply - tested near maximum output load voltage very stable - not a lot of information on the net on this model of supply, probably why it is still cheap.
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Noneya - Indeed on everything...
Just want to point out why the current is reduced on overload...
This is because the current is detected on the primary side in that type of supply, which makes it actually a power limit protection and not a current limit protection. The voltage at the line doesn't change, and so while it does detect current to do the overload sense, this defines a maximum power input, and by increasing the voltage at the output, the trip point for the current must then be at a lower point to maintain sanity with Ohm's law.
Every switching power supply that uses input side current sense is affected by this.
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O.K Been a long time since I looked at this but decided (after putting it all together and using it for a few months as a LED supply ) that i would revisit this . Pulled it down its basically split into 2 boards . Initially i will look at the PFC board (as stated above this limits the primary supply current) and later the Power Supply board . This is from a M1000e Dell server that uses up to 6 supplies to form power supply buses for the servers, these are partially software controlled using Dell Chassis Management Controller Firmware.
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A PFC Board and a Power supply board ; looking at the PFC board
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The control for this is the 2PCS01 chip and PFC can be modded here (Data sheet attached)
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An over view of the M1000e maybe of interest
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So onto the power supply board . The turn on,fan etc is controlled by a quadruple FET bus switch on the corner of the board BU125 - data sheet attached
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It appears that my initial post identifying the "brain" was on the money, careful examination shows this to be a 56F8023 Digital Signal Controller from NXP -data sheets attached; from here modification of voltage is straight forward (using a hardware/resistor if you cant work it out you probably shouldn't have taken it apart) and wont be shown in detail. I believe that the software could be accessed and initial set of the supply is achieved via this route ;however this is well beyond me but I have included a picture of what I believe to be the port for this.
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For completeness here are the other data sheets for the power board .This closes out the voltage mods for the A2360P-00 (Unless someone can access the software. ;) )
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I have a Huawei 48v 25A/56A supply that I have added a CAN bus adapter to adjust voltage and current. Without this CAN bus adjustment the supply will nit output anything. Hacking the CAN bus may be your solution. There are plenty of code out there and this adapter pictured below.
The CAN bus adapter has an encoder that you double click for voltage (red led blinks) double click again(blue led blinks) and adjust current. You can scavenge power from the psu, 5-15v. Blue and yellow wires connect to L and H of the CAN bus if you can find them. If it’s a Dell I’m sure someone has found them. I blew up some of these before I got it right. If you install jumpers to push it to the max the output caps go off like firecrackers. Not to mention there’s some dangerous voltage there.
I can push out 58.9V and 30A on 120V or 58.9V and 59.2A on 220V
I’m using this to charge solar batteries thru a Midnite controller.
Hope this helps
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Hi solarnewbee; I believe that voltage modification is possible without software access by attacking the feedback / reference to the 56F8023 .However if someone is inclined to try a software attack I have attached Flash info from the manufacturer to assist. There is very little on the internet regarding modification to this particular power supply so they are still very cheap for a 197 Amp supply. :)
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Other info that may assist in a software attack.
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