Hi,
I'm trying to power my computer motherboard (Gigabyte) with a battery power supply. Required voltages are all there - problem is to get the ATX power sequencing timed right...
Does anyone have experience in this field and has been able to implement this power sequencing requirements? There are quite a number of components out there for this (e.g. FPGAs like Actel Fusion, LTC2928 etc.) plus a number of highly sophisticated solutions (e.g. Agilent et al.), but I wonder if anyone knows of any readily available module I could use or anything that is already there and can be used as is - I mean every cheap ATX power supply has to do get this power sequencing right and has components designed in for this, so this shouldn't really be as difficult as it currently looks for me...
Many thanks in advance,
Robert
Building Battery PS - problem with ATX power sequencing...
Moderators: NeilBlanchard, Ralf Hutter, sthayashi, Lawrence Lee, Devonavar
Correct, but... ;-)
Hi,
yes, exactly, my goal is to "power my computer motherboard (Gigabyte) with a battery power supply". I am currently using a picoPSU, but the issue is that the pico only "passes through" the 12V line as is, but for generating +5V, +3.3V and -12V it is a switching power supply with all the downsides these bring light noise and interference etc.
I want to get completely rid of any switching PS, i.e. powering the voltage rails directly with battery power. To do this I need to turn on the rails in a specific sequence as dictzated by ATX specs (5VSB, then rails with defined ramp rate, then Power_Good no earlier than 100ms but no later than 500ms). For this "power sequencing" I need some module or tool that does just this part of power management but doesn't interfere with the voltage rails themselves. Haven't found that yet...
Thank you,
Robert
yes, exactly, my goal is to "power my computer motherboard (Gigabyte) with a battery power supply". I am currently using a picoPSU, but the issue is that the pico only "passes through" the 12V line as is, but for generating +5V, +3.3V and -12V it is a switching power supply with all the downsides these bring light noise and interference etc.
I want to get completely rid of any switching PS, i.e. powering the voltage rails directly with battery power. To do this I need to turn on the rails in a specific sequence as dictzated by ATX specs (5VSB, then rails with defined ramp rate, then Power_Good no earlier than 100ms but no later than 500ms). For this "power sequencing" I need some module or tool that does just this part of power management but doesn't interfere with the voltage rails themselves. Haven't found that yet...
Thank you,
Robert
Hi Ed,
I have those +12V, -12V, +5V and +3.3V rails already clean and stable, no need for any more voltage regulation. The issue is the power on process as described as required by the ATX standard.
I have already thought of ripping apart a picoPSU or any standard ATX power supply to get this power management functionality, but the pico is just too small (hence the name
) and usually these features are "designed into" a standard ATX power supply so I could not locate and isolate them... *sigh*
Thank you,
Robert
I have those +12V, -12V, +5V and +3.3V rails already clean and stable, no need for any more voltage regulation. The issue is the power on process as described as required by the ATX standard.
I have already thought of ripping apart a picoPSU or any standard ATX power supply to get this power management functionality, but the pico is just too small (hence the name
) and usually these features are "designed into" a standard ATX power supply so I could not locate and isolate them... *sigh*Thank you,
Robert