A PSU Analytical Power Loss Model For Optimizing The Server Power Delivery Architecture
by Viktor Vogman, Power Conversion Consulting, Olympia, Wash., How2Power Today, Feb 15 2021
Focus:
While 80Plus-certified PSUs have become the market standards because of their high
efficiencies, there are still opportunities for cost and energy savings. Specifically, the
optimization of the sizes and ratings of 80Plus PSUs for the application could further
reduce the total cost of ownership for server platforms. Such optimization could be
provided very effectively if a PSU power-performance analytical model were available for
power architects. This article presents an analytical PSU power loss model that provides a
means to assess tradeoffs in continuous vs. peak power ratings of PSUs. This model also
can be used for characterizing PSU dynamic efficiency and as a tool for optimization of
the system power delivery spec. This article explains the derivation of the model,
discusses its application, and compares model results with experimental results for
different classes of 80Plus power supplies. The use of output voltage setpoint to achieve
the required power supply efficiency is also explained.
What you’ll learn:
- How to optimize power supply size and power rating to achieve lowest total cost of ownership when selecting server power supplies
- How to optimize the system power delivery spec in server systems
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