The Story Behind Cybenetics: Past, Present & Future

ETA Energy Certification (Redundant)

Cybenetics also evaluates redundant PSUs installed in servers operating around the clock (24/7). A redundant PSU consists of a mainframe with two or more power modules installed. If one fails, another module handles the load, so it continues its operation without 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. Moreover, unlike standard desktop systems, the systems that need redundant PSUs are destined for constant operation so that they won’t operate for long periods in standby mode.

In server PSUs, the 5VSB rail isn’t significant since its load and impact on efficiency are minimal compared to the overall load. So, for the moment, at least, we won’t consider the average 5VSB efficiency as we do in ATX12V PSUs.

We consider the power consumption of cooling fans in the power modules. On the other hand, we don’t consider the power consumption of any fan on the mainframe since we test the modules as standalone through a special testing fixture.

We apply at least 1450 load combinations in the DUT (Device Under Test). The overall efficiency and PF readings will be the average of all measurements, covering 2% to 100% of the PSU’s operational range.