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Specificaties ~160W, niet-modulair - Bekijk alle specificaties
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Mini-box picoPSU PicoPSU-160-XT Review

+3
cj1 16 januari 2017, laatste update op 11 april 2017, 3.855 views

Mini-box picoPSU PicoPSU-160-XT

Ondanks al zijn compactheid is de picoPSU-160-XT jammer genoeg circa 4 millimeter te hoog om in een 1U server te passen. Verder is het wonderbaarlijk dat zo'n hoge efficiŽntie op zo'n klein PCB is gekregen. Al overdrijft de "Quick Installation Guide" (1.0d) de efficiŽntieprestaties met 2 tot wel 14 procentwaarden.

Pluspunten

  • compact
  • keurig geassembleerde PCB en kabels
  • responsieve ondersteuning

Minpunten

  • past niet in 1U case
  • efficiŽntie lager dan specs
  • onjuiste hoogte in handleiding
  • fabrikant neemt geen verantwoordelijkheid voor onjuistheden

Eindoordeel

Score: 2Per criterium
Warmteproductie Score: 2
Geluidsproductie Score: 5
Prestaties en stabiliteit Score: 4
Aansluitingen Score: 4
Uitrusting Score: 1
Prijs Score: 4
The picoPSU PCU's are often used in lower power devices. I am building a low power server, that is the reason why I am evaluating a picoPSU. The picoPSU performs efficiency wise way better then a bronze 250 watt supply at below 20 watt loads as you can read in my ASRock 1U12LW-C2750 review.

Incorrect height in manual and not 1U compliant

My digital caliper measures a height of 36.11 millimeters for the 160-XT:
https://ic.tweakimg.net/images/member/original/1CsVcH1NpafOd7D.jpeg
Despite this the picoPSU-160-XT manual 1.0d writes on page 4 writes that the height is 30mm and being 1U compliant. Looks like Mini-box has not yet bothered to update dimensions, and made this manual by just copying the 150-XT manual.
150XT height: 30mm
The 160-XT contains 10 watts of horsepower more then the picoPSU-150-XT. Despite that difference this 160 watts edition is also at least 6 millimeters higher then the 150-XT. The 150-XT measures 29.88 millimeters according to the mini-box homepage:
https://ic.tweakimg.net/images/member/620xauto/1CsVcH3XerxpkOV.png

DC-DC power efficiency

Now I want to know how the picoPSU performs efficiency wise because the available manufacturer supplied efficiency values are quite coarse. This is what the picoPSU manufacturer (mini-box.com) states in their picoPSU-160-XT "Quick Installation Guide" Version 1.0d at page 4:
https://ic.tweakimg.net/images/member/original/1CsXRL1ogGsiL0p.png

Measurement setup

Let me power up the Itech AT8512A+ electronic load, two Zes Zimmer LMG95 precision power meters to preheat. A 90% efficient Mean Well GST60A12-P1J power supply will provide 12VDC juice. I the mean time I am going to prepare an ATX extension cable by removing 5 times the 5V power pins, 4 times the 3.3V power pins and 4 times a GND pin.
ATX 24-pin extraction tool
Don't buy this ATX pin removal tool on Aliexpress or other Chinese knockoffs, it's a waste of money and resources, these Chinese ATX-Molex-Pin-Removal-Tools just don't work. The trick "How to remove to ATX power connector pins" with staples can work. Or if you have some cash on hand, I can confirm that that the Molex extraction tool mini fit jr 11-03-0044 does the pin extraction job good and lot quicker then the staples removal method.
https://ic.tweakimg.net/images/member/original/1CudK5EonSuzyEK.jpeg

The pins are freed from the 24-pin ATX connector, bundled together with some tape and attached to the electronic load. In this picture the 3.3 volt and ground wires are attached to the load:
https://ic.tweakimg.net/images/member/original/1CsTVd20S5y2lyv.jpeg
Output voltage measurement location
Next I do want to measure the output efficiency of the picoPSU, not any output cable losses. That is why one of the LMG95 power meters is used to measure just the output voltage, and do that directly at the picoPSU, via the yellow jumper wire (3.3VDC ATX pin = purple cable):
https://ic.tweakimg.net/images/member/original/1CsTVd3MLn37kWR.jpeg
Input voltage measurement location
However the input cable losses are included in the efficiency because you can't easy change the soldered input power cables. Voltage (and therefore power) is measured at the circular 12V DC input power jack connector.
Pre-heat PSU
After a few hours the setup is ready and the measurement equipment is warmed up. Now it is time to pre-heat the picoPSU itself by loading the picoPSU with 8.000 amps of rated current for at least 30 minutes. The maximum current rating is derived from the mini-box.com manual "Max Load" specified values at page 4. After the initialisation, the power and voltage measurements will be taken.
Measurement cycle length and number of intervals to average
The power analysers are sampling at 100 kHz, where each measurement cycle (displayed value) is 2.00 seconds and where last ... measurement intervals are shown as an average value. For 3.3VDC the average is set to 60 cycles, resulting in 120 seconds; for 5VDC averaging takes place for 120 cycles, resulting in 240 seconds of total interval displayed.
Measurement uncertainty
Measurement equipment comes with uncertainty, educate yourself what this means, I am also showing the lowest and highest efficiency values based on the uncertainty values for the measurement ranges in use at the LMG95. The only measurement uncertainty that is being neglected is the uncertainty of the electronic load. These 2 uncertainties already result in 0.1 till 0.3% points of difference in efficiency.
Eta = η = PSU efficiency
The lower case greek letter »ta (η) is also used as abbeviation/symbol for the efficiency of a power supply, defined as the output power divided by the input power.

in reality less highly efficient

measuredspecdifference
η maxη minη decl.
8A@3.3V89.4%89.1%93%-4%
5A@3.3V90.4%90.2%92%-2%
3A@3.3V89.3%89.1%96%-7%
1A@3.3V79.2%79.0%93%-14%
8A@5V88.9%88.7%93%-4%
5A@5V91.3%91.0%95%-4%
3A@5V91.7%91.4%96%-4%
1A@5V85.2%85.0%94%-9%

As you can also see in the more detailed picoPSU measurement results below, for both voltage lines.
3.3V line measurement results
https://ic.tweakimg.net/images/member/620xauto/1CudHX17gDlYJm1.png
Load (A)LoadUtrms (V)P (W)Efficiencyη maxη minη decl.
8.400105%3.3498931.677088.8%89.1%88.6%
8.000100%3.3495630.024889.2%89.4%89.1%93%
7.60095%3.3491628.507189.3%89.4%89.1%
7.20090%3.3487126.941889.5%89.6%89.3%
6.80085%3.3482025.336789.9%90.0%89.8%
6.40080%3.3478723.801990.0%90.1%89.9%
6.00075%3.3475722.282290.1%90.2%90.0%
5.60070%3.3472320.773590.2%90.3%90.1%
5.20065%3.3468519.276190.3%90.4%90.2%
5.00062.5%3.3466718.532390.3%90.4%90.2%92%
4.80060%3.3464317.788990.3%90.4%90.2%
4.40055%3.3461216.318690.2%90.4%90.1%
4.00050%3.3458314.856490.1%90.2%89.9%
3.60045%3.3455713.404889.8%90.0%89.7%
3.20040%3.3453011.965389.5%89.6%89.4%
3.00037.5%3.3451511.251289.2%89.3%89.1%96%
2.80035%3.3450110.537688.9%89.0%88.8%
2.40030%3.344869.119988.0%88.1%87.9%
2.00025%3.344657.711586.7%86.9%86.6%
1.60020%3.344476.310384.8%85.0%84.6%
1.20015%3.344264.9205181.6%81.7%81.5%
1.00012.5%3.344084.2298179.1%79.2%79.0%93%
0.80010%3.343963.5409575.5%75.7%75.4%
0.4005%3.343792.1559662.0%62.1%62.0%
0.0000%3.343680.82151

Actually the manufacturer specified efficiencies are never met. At 5 amps of 3.3 VDC load the declared efficiency is most close to the reality: 92% versus 90%, only a minus 2 percent difference. At 1 amps of 3.3 VDC load the spec is most far off the real life efficiency measurement: 93% versus 79%, a discrepancy of a whopping minus 14 percent points. Ituner Networks Corp. receives no points for this.
5V line measurement results
https://ic.tweakimg.net/images/member/620xauto/1CudHXC2JU10Tmu.png
I do want to finish these tedious manual measurements and review writing within 2 days. That is why I have reduced the numer of different load measurment points. Sorry that my measurement setup is not (yet) automated.
Load (A)LoadUtrms (V)P (W)Efficiencyη maxη minη decl.
8.800110%4.9410649.513387.8%88.0%87.6%
8.400105%4.9488647.088188.3%88.5%88.1%
8.000100%4.9574244.647788.8%88.9%88.7%93%
7.20090%4.9729240.003789.5%89.6%89.4%
6.40080%4.9871935.355990.3%90.4%90.2%
5.60070%4.9997430.820790.8%91.0%90.7%
5.00062.5%5.0087627.467791.2%91.3%91.0%95%
4.80060%5.0116226.309591.4%91.5%91.3%
4.00050%5.0227921.916391.7%91.8%91.6%
3.20040%5.0334917.576891.6%91.8%91.5%
3.00037.5%5.0360416.502891.5%91.7%91.4%96%
2.40030%5.0435913.301291.0%91.1%90.9%
1.60020%5.053399.078689.1%89.2%88.9%
1.00012.5%5.060515.9469285.1%85.2%85.0%94%
0.80010%5.062814.9056182.6%82.7%82.5%
0.4005%5.067442.8331971.5%71.6%71.5%
0.0000%5.072210.81608
Over here the efficiency expectations are never met. The measured 5VDC efficiency is at least 4 percent points lower then the declared efficiency at 3, 5 and 8 amps of load. 5V efficiency is 85% instead of 94% at 1 amps (-9%). No points here.
Measurement pictures
Because this Tweakers review format allows up to 30 pictures, I have included 24 random selected photos of the measured values from both 5V and 3.3V measuring setups. One example:
https://ic.tweakimg.net/images/member/original/1CsVyp1W0N2SyKu.jpeg

Gebruikt in combinatie met:

Bekijk alle afbeeldingen:

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Reacties (6)

Wijzig sortering
Voor het doel dat zo'n voeding heeft is dit een perfecte review. Overigens vind ik de vele foto's van de metingen wat overbodig gezien deze al in je tabellen staan. Als je die tabellen nou eens naar een grafiek zou vertalen. Wat ik wil weten staat er, dus zie het niet als negatief commentaar, maar in ťťn oogopslag wordt het helemaal mooi.
Dank voor het delen van uw wensen.
Daarom op uwer verzoek zijn er voor zowel de 5V als ook de 3.3V rail een eigen grafiek toegevoegd. Hopelijk maakt dat de zaak in oogopslag inzichtelijk.
Zo is ook goed te zien dat de discrepantie tussen wat de fabrikant opgeeft en de meting bij lagere loads groter wordt. Heel mooie toevoeging.
Fantastische review. Erg bedankt voor al het werk!
De energie-efficiŽntie grafieken zijn nog wat verbeterd, zodat nu ook de meetpunten zichtbaar gemaakt worden ťn is de suggestieve kromme vervangen door een rechte lijn die de meetpunten precies verbindt.


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