In an era of accelerated construction in artificial intelligence data centers (AIDCs), high-density, high-power AI servers are constantly pushing power supply systems to their limits. Stability and reliability have become the indispensable "lifelines" underpinning computing power.
Faced with surging testing demands and stringent energy efficiency requirements, are traditional testing methods falling short? Kewell leveraging its next-generation AC/DC power supply and electronic load product portfolio, delivers an efficient, precise, and future-ready full-stack solution for HVDC testing.
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Development Trends:
Shifting from AC Systems to High-Voltage DC
The explosive growth of AI computing power has driven power requirements for IT racks beyond the megawatt level, imposing extremely high demands on AI data center energy consumption. AI data centers require comprehensive optimization of the entire power distribution chain, establishing new power distribution infrastructure and redefining internal power management approaches to meet energy efficiency and operational cost requirements.
Source: Data Center 800V DC Power Supply Technology White Paper (2.0)
Facing the exponential increase in IT rack power density, raising data center power supply voltage has become a core approach to reducing costs and improving efficiency. The limitations of traditional UPS AC power supply solutions are becoming increasingly evident, and the shift toward high-voltage DC architectures is a clear trend. HVDC with DC800V/±400V output, the Panama Power Supply (DC uninterruptible power supply), and Solid-State Transformers (SST) — these three solutions, characterized by high efficiency and reliability, have emerged as the preferred paths for enabling high-quality data center development.
The rise of high-voltage DC architectures entails changes across the entire power supply chain. At the end of the power supply architecture, large-scale deployment of 800V to 54V/12V DC-DC power modules handles the power conversion task between the 800V high-voltage DC bus and the low-voltage DC AI computing chips.
Source: NVIDIA《800 VDC Architecture for Next-Generation AI Infrastructure》
There are two main types of DC-DC power modules under the high-voltage DC architecture. As shown in figure (a), a DC-DC power module is first used to step down 800V to 54V, which is then converted to 12V by a downstream DC-DC module, making it compatible with existing server rack architectures. New-generation 800V MGX server racks support direct access to 800V DC power. As shown in figure (b), the DC-DC power module directly converts 800V to 12V output. This architecture places the DC-DC conversion closer to the GPUs, significantly reducing connector size and copper usage while lowering power losses.
02
Test Standard Interpretation and Test Items:
Confronting Testing Challenges
Source: Diablo 400 Project: Rack and Power
The switching frequency for dynamic load tests can reach up to 10kHz, imposing stringent demands on both the current slew rate of the electronic load and the dynamic response speed of the power supply. Furthermore, in megawatt-level testing scenarios, source and load equipment often need to operate in parallel with multiple units, requiring exceptionally high consistency and coordination among master and slave units.
03
Kewell’s Solution:
Designed for Efficient and Reliable AIDC Testing
Leveraging its next-generation core equipment — AC/DC power supplies and electronic loads — Kewell provides a comprehensive, high-reliability integrated solution for the high-voltage DC (HVDC) testing field.
PSU/Shelf/Rack testing is based on Kewell’s latest AC/DC source and load platform: On the AC side, the A2000 series supports single-unit output from 100kW to 500kW. On the DC load side, two testing solutions are available based on requirements: the D2000 (1200V) series meets reliability and aging test needs with efficient regenerative loading, covering single-unit power from 100kW to 600kW; the E5100 (1200V) series meets high-dynamic performance testing requirements such as EDPP, with single-unit power ranging from 2kW to 72kW.
All models in the series utilize fiber-optic communication for master-slave parallel operation, meeting the demands of megawatt-level (MW) large-scale testing scenarios while ensuring high-precision consistency in multi-unit parallel output.
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SST
Kewell—SST Module/SST Test Diagram
For SST module input characteristic testing, the A2000 series single-phase 1400V (L-N) output mode can be used, fully covering the input electrical characteristic requirements of SST modules.
DCDC power modules currently have a typical power rating of around 18kW. On the input side, the S7200 (1000V/1200V) series bidirectional DC power supply features a power density of 30kW per 3U. On the output side, the E5100 (150V) series high-performance DC electronic load meets dynamic testing requirements.
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Solution Highlights
05
Conclusion
For the server power supply industry, Kewell leverages deep industry understanding, a comprehensive product portfolio, innovative product architecture, exceptional product performance and stability, and a well-established global service system to provide customers with efficient, reliable, and forward-looking solutions.
As AI computing power demands continue to grow, Kewell remains committed to supporting the reliability of AIDC infrastructure with its advanced technologies and products, contributing to the development of the digital economy.
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