ETA (Redundant)
Our requirements for efficiency certifications on Redundant Power Supplies
Besides
non-redundant Power Supplies (PSUs), the ones used by typical desktop PCs that most
users have, we also evaluate redundant PSUs that are usually installed in
servers that operate all around the clock (24/7). A redundant PSU consists of a
mainframe where two or more power modules are installed. If one of them fails,
another module handles the load, so it continues its operation without any
issues. In most cases, the minor rails into a redundant PSU are generated by
DC-DC converters installed onto the mainframe, so the modules only need to
deliver the main rail (12V) and standby voltage (5V).
Because all
power modules of a redundant PSU are online continuously, there is no point in
measuring Vampire Power because it will be increased. Moreover, the systems
that need redundant PSUs are destined for constant operation, so they won’t
operate for long periods in standby mode, contrary to standard desktop systems.
In server PSUs,
the 5VSB rail isn’t of high importance, too, since its load and its impact on
efficiency are minimal compared to the overall load. So, for the moment, at
least, we won’t take into account the average 5VSB efficiency, as we do in
ATX12V PSUs.
We do take into account the power consumption of cooling fans in the power modules. On the other hand, we don't take into account the fan power consumption of any fan on the mainframe. If there is one, we will power it through an external power supply and we will provide its power consumption in our reports, only for reference purposes.
Our redundant
PSU efficiency requirements will get constantly updated as we evaluate more
PSUs and have more data to create a complete standard.
We apply at least 1450 different load combinations in the DUT (Device Under Test). The overall efficiency and PF readings will be the average of all measurements, which cover from 2% to 100% of the PSU’s operational range. The overall efficiency will be the average of all measurements, which cover the PSU’s entire operational range.
Efficiency Levels (230V Input) | Efficiency (1) | PF (2) |
---|---|---|
DIAMOND | ≥95% overall efficiency | ≥0.950 |
TITANIUM | ≥93% & <95% overall efficiency | ≥0.940 |
PLATINUM | ≥91% & <93% overall efficiency | ≥0.930 |
GOLD | ≥88% & <91% overall efficiency | ≥0.920 |
SILVER | ≥85% & <88% overall efficiency | ≥0.910 |
BRONZE | ≥82% & <85% overall efficiency | ≥0.900 |