Rapidly increasing computational demands from artificial intelligence workloads necessitate novel power supply architectures. Infineon Technologies presents a 27-kilowatt three-phase power supply unit that meets Open Compute Project Open Rack V3 specifications. The reference design provides superior power density, efficiency and thermal performance while reducing server ODM and OEM development cycles. Digitally managed PFC and LLC converter stages along with an integrated energy buffer deliver swift transient response and scalable operation.
Table of Contents: What awaits you in this article
Five-stage ANPC PFC plus three-stage LLC achieves ninety-eight-percent efficiency
The reference design integrates a five-stage active neutral-point-clamped (ANPC) power factor correction (PFC) topology with a three-stage LLC resonant converter. At 480 VAC input voltage and 50 percent load, it achieves efficiency above 98%, reducing energy losses. Delivering 116 W/in³ power density, it significantly outperforms the ORV3 minimum requirement of 94 W/in³. This high density contributes to improved rack-level space utilization and lowers cooling needs in AI server installations.
Integrated energy buffer delivers 20ms hold-up during network disturbances
An integrated energy buffer provides a 20 ms hold-up time during short power disturbances, ensuring that rapid GPU load changes remain isolated from the main supply. By eliminating the need for a separate Capacitor Bank Unit (CBU), the design simplifies the PSUs architecture and reduces component count within the rack environment. This seamless integration optimizes space utilization, lowers manufacturing complexity, and enhances reliability by consolidating energy storage and distribution functionality directly within the power supply module.
PSOC C3 Microcontroller Digitally Controls PFC And LLC Functions
The PFC and LLC stages are digitally governed by the PSOC Control C3 Performance Line microcontroller, which delivers a platform for power management algorithms. A programmable power control accelerator provides sampling and high-precision current and voltage regulation across a operating range. This combination ensures that the power supply responds instantly to rapid current demands and voltage fluctuations generated by AI workloads, maintaining stable operation under dynamic and challenging server conditions.
Reference design supports 311 to 528 VAC input range
The reference design supports three-phase input voltages ranging from 311 to 528 VAC, ensuring compatibility with a wide array of international utility grid standards. It maintains a consistent power factor exceeding 0.99 across light to full load conditions, minimizing energy losses and optimizing operational efficiency. Low total harmonic current distortion lowers stress on supply infrastructure and enhances system reliability. The implementation simplifies rapid deployment in global data center power environments.
Planar magnet delivers compact modular scalable high-frequency transformer design
A planar magnetic construction reduces footprint and enables a compact high-frequency transformer architecture with modular sections and scalable expansion. The design leverages magnetic cores and optimized winding techniques to boost efficiency. The developer benefits from seamless integration into existing racks and a manufacturing process, while automated assembly procedures minimize manual intervention. This approach accelerates time-to-production, improves yield, and maintains tight tolerances across batches, resulting in performance under demanding dynamic loads.
Infineon Unveils 27kW PSU at OCP Summit October 2026
He will be showcased at the OCP Global Summit in San Jose, California, from October 12 to 15, 2026, at booth E26, and will appear again on October 22, 2026, at OktoberTech(TM) Silicon Valley 2026. Attendees will examine his advanced power conversion efficiency, integrated energy buffer and cutting-edge digital regulation features with industry-leading performance metrics. Engineers and data center professionals gain hands-on insight into his thermal performance and modular architecture.
Infineons 27 kW three-phase PSU meets OCP Open Rack V3 specifications by delivering over 98 percent efficiency at half load and 480 VAC input. A five-stage ANPC PFC and LLC topology with an integrated energy buffer providing 20 ms hold-up time supports AI workload transients. Fully digitally controlled through PSOC(TM) Control C3 Performance Line and employing planar magnetics, the modular design shortens development cycles and improves reliable server rack cooling.
