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First 12kW power supply design for AI data centres

First 12kW power supply design for AI data centres

Technology News |
By Nick Flaherty



Infineon Technologies has developed a 12kW power supply reference design for AI data centres that it says is a world first.

The influence of artificial intelligence (AI) is driving up the demand for data centres power across Europe as highlighted in a recent report in eeNews Europe.

The 12kW and 8kW designs are intended to complement the existing 3 kW and 3.3 kW power supplies available today. High-level GPUs now require up to 1 kW per chip reaching 2 kW and beyond by the end of the decade. This will lead to higher overall energy demand for data centres, driving higher efficiency designs.

The new generation PSUs achieve an efficiency of 97.5 percent and meet the most stringent performance requirements. The new 8 kW PSU is capable of supporting AI racks with an output of up to 300 kW and more with a power density of 100 W/in³ compared to 32 W/in³ in the available 3 kW unit.

Power shortages hold back data centres

Infineon says this is made possible by the combination of silicon, silicon carbide and gallium nitride devices.

The 8kW reference design board combines Complete Power Supply Unit (PSU) including single-phase PFC and DC-DC converter with a digital control Interleaved Bridgeless totem-pole PFC + Full-Bridge high frequency GaN LLC and exceeds the ORv3 data centre power specification and OCPv3 form factor for servers.

The architecture reduces the number of capacitors to reduce the size and provide higher reliability and uses 650V CoolSiC MOSFETs with 650V CoolGaN transistors and 600 V CoolMOS 8 superjunction MOSFETs as well as OptiMOS 5 80V and 60V silicon power MOSFETs 80 V and a CoolSET flyback controller with integrated 800 V CoolMOS MOSFET.

The 12 kW design uses two 6 kW modules with a multi-level topology and a new holistic digital control scheme. It is based around 400V CoolSiC MOSFETs and 100V CoolGaN Transistors as well as a 600 V CoolMOS 8 SJ MOSFET, CoolSET flyback controller with integrated 800 V CoolMOS and PSoC  and XMC microcontrollers.

“At Infineon, we power AI. We are addressing a critical question of our era – how to efficiently meet the escalating energy demands of data centres,” says Adam White, Division President Power & Sensor Systems at Infineon.

“It’s a development that was only possible by Infineon’s expertise in integrating the three semiconductor materials silicon (Si), silicon carbide (SiC), and gallium nitride (GaN) into a single module. Our PSU portfolio is therefore not only an example of Infineon’s innovative strength, which leads to first-class results in terms of performance, efficiency and reliability for data centres and the AI ecosystem. It also reinforces Infineon’s market leadership in power semiconductors.”

The 8 kW Power Supply Unit will be available in Q1 2025.

Details of the Infineon AI data centre power supplies are here.

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