Artificial intelligence workloads are redefining the power requirements of modern data centers. Increasing GPU performance and rising rack densities are driving a shift toward 800 VDC or ±400 VDC power supply architectures. To address these requirements, Infineon Technologies AG is launching a 27kW three-phase power supply unit (PSU) solution for server ODMs and OEMs. The reference design meets the requirements of the OCP Open Rack V3 (ORV3) specification and AI server rack architectures, further expanding Infineon’s comprehensive portfolio for powering AI servers. The solution helps developers shorten time-to-market while improving rack power density, efficiency, and thermal performance.
The design combines Infineon components including 650V CoolSiC and CoolMOS MOSFETs, EiceDRIVER gate drivers, XENSIV current sensors, and PSOC microcontrollers. It achieves a peak efficiency of more than 98 percent at an input voltage of 480 VAC and 50 percent load. The reference design uses a five-level ANPC PFC topology and a three-level LLC converter, reaching a power density of 116 W/in³, compared with the ORV3 minimum requirement of 94 W/in³. An integrated energy buffer provides a hold-up time of 20 milliseconds during short power grid disturbances. It also helps smooth the line voltage during rapid GPU load changes, eliminating the need for a separate capacitor bank unit (CBU). An integrated planar magnetic structure enables a compact, modular, and scalable high-frequency transformer design.
The PFC and LLC stages are digitally controlled to respond to demanding AI load transients. The programmable power control accelerator (PPCA), integrated into the PSOC Control C3 Performance Line microcontroller, supports precise current and voltage regulation with fast dynamic response. The reference design supports a three-phase input voltage range of 311 to 528 VAC and is therefore suitable for a range of global grid standards. It achieves low input-current total harmonic distortion (iTHD) and a power factor above 0.99 across most of the load operating range. The design supports operation at ambient temperatures from -5°C to 45°C.
