Page 3 - Physical Look - Inside
As always, we opened up our be quiet! Pure Power 12 1000W power supply to take a detailed look at what is going on inside. Please note that doing this at home may invalidate your 10-year warranty thanks to a seal that extends over one edge of the power supply. But for the benefit of you, we cracked ours open, so you do not need to. There are no user serviceable parts inside. Disassembling the be quiet! Pure Power 12 1000W is quite straightforward and you can do so by removing four screws next to the fan mount and a fifth screw on the side under the warranty label. Our photo above shows an overhead view of its internal components. Despite a notable design difference from the Pure Power 12 M 1000W, I think the OEM is still HEC, a manufacturer of mostly budget products since 1979. As such, the build quality is mostly good. There is a total of three heatsinks inside, all located on the primary side.
At the transient filter stage, there is a total of two X-capacitors and six Y-capacitors near or around the AC receptacle. This is at least two times the amount of X and Y capacitors than recommended. In addition, we have a ferrite coil and metal oxide varistor. The MOV helps with suppressing voltage spikes. Considering some budget modern-day PSUs have missing MOVs, I am happy to see it here.
The active PFC circuit featured on the be quiet! Pure Power 12 1000W uses two Yangjie GBJ2510 bridge rectifiers on one side of the large primary heatsink. At 115V, the maximum rectified forward current capacity with heatsink is 25A each, so you can theoretically pull up to 5750W -- 25A * two diodes * 115V -- from the bridge rectifier at 100% efficiency. Of course, this is limited by the fact that it is not 100% efficient, and neglects the fact that not every component in the system is able to keep up.
Further down the line, we can see two active PFC MOSFETs, the Vishay SiHP33N60E power transistors, all on the other side of the bridge rectifiers. Each is certified for up to 21A at 100c. These transistors present a typical resistance of 83mΩ when turned on according to the manufacturer's data sheet. This on characteristic is called Static Drain-Source On-Resistance, or commonly abbreviated as RDS(on). The more efficient the component is, the lower the RDS(on) value, since it wastes less power with lower resistance. On the same heatsink, there is one boost diode that I was unable to identify. Finally, we have two more switcher MOSFETs located on another heatsink near the primary capacitors, and these are the Infineon IPA60R099P6. Each of these are certified for up to 24A at 100c. These transistors present a typical resistance of 89mΩ when turned on according to the manufacturer's data sheet. Champion's CU6901 is the switching controller.
On the primary side, we can see one Taiwanese-brand Teapo LH capacitor. Our 1000W version of the be quiet! Pure Power 12 series power supply incorporates a single 820µF x 400V capacitor. Unfortunately, this one is only rated at 85c. This was quite surprising, as the be quiet! Pure Power 12 M 1000W used primary capacitors with a rating of 105c. A higher temperature rating indicates better durability and quality of the capacitors.
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On the secondary side, we have more Teapo capacitors, both electrolytic and polymer, rated at 105c. All rectifiers produce the +12V out, while the +5V and +3.3V outputs are generated from the +12V output using a DC-to-DC converter. Eight IPS FTG014N04SA power MOSFETs are responsible for generating the +12V output, located at the bottom of one of the daughterboards on the secondary side. Unfortunately, I was unable to find any specifications on these transistors.
More MOSFETs on an additional add-in board generate the +5V and +3.3V output, and these are a pair of UBIQ QM3054M6 and QN3107M6N each. The QM3054M6 has typical and maximum RDS(on) values of 3.8mΩ and 4.8mΩ at 25c, respectively. Meanwhile, the QN3107M6N has RDS(on) values of 2.1mΩ and 2.6mΩ. Protection is provided by a single IN1S4291-DCG. The datasheets for all the components mentioned in the inspection can be found on their respective manufacturers’ website.
Finally, you can see where all the cables are connected and sleeved to lead outside of the be quiet! Pure Power 12 1000W. There is nothing too special here, other than the fact there are a lot of cables running around. The overall build quality is good for a budget power supply with some corners cut to keep the costs down. Component selection is on the lower tier of parts. Components are spaced well enough to ensure airflow and heat dissipation.
Finally, the fan in the be quiet! Pure Power 12 1000W is marked as the QF2-12025-HS, and connects to an add-in board with a 2-pin connector. This is a 120mm fan, which is a bit small for a power supply of this size and wattage, although if there is not much heat generated, this is not necessarily something to be concerned about. Otherwise, this is a rifle bearing fan that operates at 2000RPM and 0.3A. Fans with rifle bearings are relatively quiet and have much longer lifespans compared to sleeve bearing fans, making it quite suitable for this application.
Page Index
1. Introduction, Packaging, Specifications
2. Physical Look - Outside
3. Physical Look - Inside
4. Minor Tests and Conclusion
