Delta looks to 48V to 0.7V direct conversion for GPUs

Delta looks to 48V to 0.7V direct conversion for GPUs

Technology News |
By Nick Flaherty

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Delta is developing direct conversion of 48V data centre power bus to 0.7V to power the next generation of graphics processing units (GPUs) for AI.

The VR Series vertical DC-DC converters developed by Delta have a profile height as low at 4mm and can operate with GaN switches up to 5MHz to reduce the size. The direct conversion saves between 5 and 15% of the energy losses by assembling the power module on the back side of GPU accelerator chips.

These are accompanied by single, dual and quad power chokes with a similar profile on display at Nvidia’s GTC conference this week in California. These chokes include additional windings to allow them to communicate between power phases to spread the current load. The current for the next generation Blackwell GPUs launched by Nvidia this week is up to 1400A.

Delta sees high voltage DC 800Vdc distribution inside data centres with a modular Solid State Transformer (SST) cabinet and a 1OU 80kW DC-DC Power Shelf design to convert the 800Vdc down to 50Vdc bus voltage on the rack level. This would then be converted directly to 0.7V rather than the 12V intermediary bus used today.

“As the proportion of GPUs increases in AI computing, global power consumption from data centres is expected to more than double to over 1 trillion kWh by 2026,” said Ralf Pieper, the R&D Director of Delta’s Custom Design Business Unit. “Between 2010 and 2022, Delta’s solutions helped our customers worldwide save over 39.9 billion kWh of electricity. Our unique expertise in high-efficiency server power and DC-DC converters, as well as ICT and energy infrastructure, allows us to spearhead the development of groundbreaking solutions capable of supporting the AI megatrend by optimizing the grid-to-chip power conversion cycle.”

The ORV3 Racks and 50Vdc busbars for centralized AI power infrastructure include 48kW shelves with 8,000W power output power supply units, boosting efficiency by up to 97.5%, and AC input 33kW shelf models with 5,500W ORV3 HPR units.

A 22kW Peak Load Shaving Shelf (PLSS) with 3x 7.33kW double-slot units and supercapacitors reduce the input side power pressure and improve system reliability. Thes are suitable for  high-repetitive pulsed loads, such as those from Nvidia’s EDDP curve while protypes of a 1OU 80kW Power Shelf design with 2x rails of 40kW each and isolated DC/DC converters for 800Vdc to 50Vdc power conversion are designed to increase efficiency by up to 98% for AI data centres.



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