EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: Trurl on December 07, 2023, 09:49:27 am
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I was checking out the specifications sheet(sample attached below) for the Deutronic 1200 PSU, noting things like "recovery time", "ripple and noise"* etc..
* Data Sheet indicates:
"Recovery time" : < 1ms
"Voltage ripple" : < 50mVpp
"Switching spike" : < 300mVpp
It would be interesting to compare such specs with that of server PSUs.
Has anyone checked such specs (under load), or can post specs(from data sheets) for particular server PSU models?
Thanks...
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DBL1200 is smart car battery charger very well made and optimized for lead acid battery as a load.
One to one comparison with server PSU does not make sense.
Twelve volts are not directly used in servers (except for fans maybe) so there shouldn't be some strict noise limit.
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"DBL1200 is smart car battery charger ... and optimized for lead acid battery as a load." <- That is a gross understatement of the DBL1200, as it is used as a voltage regulator/power source during flash programming electrically sensitive ECUs of high performance automobiles. You can get a $20 battery charger... a DBL1200 is well over $1000. The difference is in noise levels, steady output under dynamic loads etc.
Server PSUs are also known to be robust voltage regulator/power sources. In this regard, comparison between the two is entirely possible, and is of interest to many many folks, because many are using server PSUs instead of the DBL1200(because server PSUs are much more affordable and will do the job), so it makes a lot of sense to those that understand the use and requirements.
"Twelve volts are not directly used in servers (except for fans maybe) so there shouldn't be some strict noise limit." <- This is totally meaningless in this context as neither the DBL1200 nor a server PSU would be used at 12V when flash programming ECUs(or ever for that matter), they would be set higher (e.g. 14~14.2V, or 13.8V etc.) Server PSUs DO have "strict" noise limits (albeit perhaps not as "strict" as the DBL1200), or they could not be used in enterprise servers.
If you do not have pertinent information relating to the original post, please refrain from posting.
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The following link downloads Infineon Technologies' application note paper on an "800 W Platinum® server power supply".
https://www.google.com/url?sa=t&rct=..._&opi=89978449 (https://www.google.com/url?sa=t&rct=..._&opi=89978449)
In the paper's "6. Test Results" (p.42/70), the following is stated:
Test: Steady-state Vout ripple
Conditions: 230 Vrms/115 Vrms/90 Vrms 50/60Hz, 10% to 100% load
Result: |∆Vout| < 120 mVpk-pk*
* More than twice the value of the DBL 1200(Deutronic's specs are relatively more restrictive)
As detailed server PSU specs from say HP and Dell are difficult to find, Infineon's example at least serves as a good reference. Hopefully, actual specs of HP server PSUs will be found...
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HP does not reveal 'ripple & noise' of its server PSUs, but Delta, one of the manufacturers of HP's PSUs, indicates the spec in its brochure*:
*Delta AC-DC CRPS Front-End Power Supply
https://downloadcenter.deltaww.com/downloadCenterCounter.aspx?DID=43777&DocPath=1&hl=en-US
Output Characteristics
Ripple & Noise - 12V: <120mVp-p
It seems that "less than 120mV peak-to-peak" is sort of the standard for server PSUs, albeit there are ones with lower standards like 200mVp-p (e.g. SUPLET SAC1600).
[attachimg=1]
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"DBL1200 is smart car battery charger ... and optimized for lead acid battery as a load." <- That is a gross understatement of the DBL1200, as it is used as a voltage regulator/power source during flash programming electrically sensitive ECUs of high performance automobiles. You can get a $20 battery charger... a DBL1200 is well over $1000. The difference is in noise levels, steady output under dynamic loads etc.
Server PSUs are also known to be robust voltage regulator/power sources. In this regard, comparison between the two is entirely possible, and is of interest to many many folks, because many are using server PSUs instead of the DBL1200(because server PSUs are much more affordable and will do the job), so it makes a lot of sense to those that understand the use and requirements.
"Twelve volts are not directly used in servers (except for fans maybe) so there shouldn't be some strict noise limit." <- This is totally meaningless in this context as neither the DBL1200 nor a server PSU would be used at 12V when flash programming ECUs(or ever for that matter), they would be set higher (e.g. 14~14.2V, or 13.8V etc.) Server PSUs DO have "strict" noise limits (albeit perhaps not as "strict" as the DBL1200), or they could not be used in enterprise servers.
If you do not have pertinent information relating to the original post, please refrain from posting.
There are servers running at 12vdc ... i've bought a few of them, some where rated at 12vdc 55 amps and one at 100 amps
And myself would advise you guys
Do not start a war of words or this or that the mods will or may kill the thread, return to the subject or simply stop it
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... return to the subject or simply stop it
On that note, let me clarify the subject of this thread:
Professional automotive ECU programming PSU (very expensive with extreme specs)
vs
Modified(OVP/output voltage) server PSU (cheap and good enough to get the job done)
What are the noticeable differences in specs that are of interest for the intended use? (automotive ECU programming)
The subject is not about servers or what voltages they use.
Cheers...
Update
'Voltage Regulation':
DBL 1200 = <5% 100Hz (10~90% load)
vs
Delta PSU = +/-5%
"Recovery Time"/"Rise Time":
DBL 1200 = <1ms
vs
Delta PSU = <70ms(DPS-1300-AB-21 N)
The similar voltage regulation capability of server PSUs seems to be the key factor for its ability to be used during automotive ECU flash/programming.
The less restrictive yet still low ripple & noise spec and the slower "Recovery Time"/"Rise Time" of the server PSU seem to be good enough, likely due to "support" from the car's battery acting like a buffer/capacitor.