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800 VDC — High Voltage DC Distribution for Data Centers

Q: What safety approvals are necessary for 800 VDC data center architectures and how is insulation/isolation realized?

High-density PCB technology with strict control over high voltage routing, reinforced isolation zones, and compliance with IEC 62368 layout requirements increases high voltage system safety. These modules also follow IEC 60664 for insulation coordination, allowing reduced creepage when conformally coated and IPC-2221B for high voltage PCB design.

Q: What fluid types are used to dissipate heat from the module?

In 800 VDC architectures, fluid cooling is the best way to dissipate heat from the module is fluid cooling. Typically, DI-water, 50:50 glycol is used. Even at 98% efficiency, a 6 kW unit will have 120 W of dissipation. Module derating is based on the temperature of the baseplate. As long as the temperature is less than 90°C, 100% power is available.

Q: What is the cooling-fluid temperature for data center 800 VDC designs?

Generally, the fluid-entry temperature for 800 VDC designs is around 2 to 4°C cooler than the exit temperature (depending on flow rate). The heatsink assembly is usually in the region of 5 to 10°C hotter than the fluid temperature. Accounting for some thermal resistance between the baseplate and heatsink (2 to 3°C), if the fluid-entry temperature is at 40°C, the baseplate temperature will be around 52°C max and the baseplate of the modules would be at 55°C.

Q: What is the impact at facility and cabinet levels of conducted EMI with fundamental shifted to >1 MHz?

As with all applications that share an input voltage source, injection noise onto the source of the power needs careful consideration. The power conversion generates conducted noise that must be filtered out before it reaches the shared input. This minimizes detrimental effects to any other equipment that is supplied by that shared input. To achieve high power densities, the switching frequency of the power conversion has now exceeded 1 MHz, which is already at the lowest level of 55033 noise limits.

Q: Why is discharge function important for 800 VDC architectures?

Hold-up capacitors in the PDB discharge for the few milliseconds it takes for the XPU devices to shut down safely. However, the capacitors can retain voltage at levels higher than ELV (60 VDC), which means that the equipment could pose a risk of shock if the connections are touched. The discharge function that the HSC module provides disipates the residual charge that is held in the hold-up caps so that the application hardware is safe to touch within 1 sec of extraction from the system.

Q: Why is inrush limiting needed?

Hold-up caps needed, but that needs inrush limiting based on hot-plug Arcing created by voltage, but current maintains the arc.... Damages caused to connector contacts.

Q: Why should I use ±400 VDC (800 VDC) as a distribution voltage?

As cabinet-level power demands continue to rise, distributing power at 50 VDC becomes increasingly impractical due to the extremely high currents required. To carry these currents efficiently, busbars and connectors must be significantly oversized; otherwise, resistive losses increase substantially, generating excess heat and reducing system efficiency. Moving to high-voltage DC distribution dramatically reduces current, enabling smaller conductors and lower distribution losses. However, higher voltages introduce additional isolation, protection, and safety requirements that must be carefully addressed in system design.

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As AI accelerates data center energy demands, higher distribution voltages are essential to maintain efficiency and support next-generation workloads. Advanced Energy empowers the shift from low-voltage 50 V distribution to ±400 VDC/800 VDC architectures with a comprehensive portfolio of rack-mounted and board-mounted HVDC power conversion solutions.

High Voltage DC Distribution

Rack Power

HVDC Server Deployed Solutions

Scaling AI Infrastructure with 800 VDC

The Challenges of Traditional Low-Voltage Power Distribution

Scaling data center power with legacy three-phase AC input and 50 V output increases complexity, reliability risk, cost, and weight:

Massive busbars are required to avoid large-scale resistive losses.
Losses generate heat that must be removed and cooled.
High current demands can push standard connectors to their thermal limits, necessitating larger connectors.

800 VDC: Higher Voltage, Lower Current

The industry is rapidly moving to 800 VDC, also referred to as ±400 VDC or HVDC (high voltage DC). Higher voltage and far less current flowing:

Minimizes electrical losses
Increases power path efficiency
Reduces busbar size and weight requirements
Eliminates connector overheating
Eliminates the need for bulky high-current connectors

Enabling the Shift to 800 VDC

The 800 VDC model brings substantial benefits along with new engineering requirements. Several key protections and design measures are required to ensure compliance with applicable standards for personnel and equipment safety, including:

Reinforced insulation
Expanded creepage and clearance
Pollution degree ratings
High voltage spacing

Two approaches are emerging for 800 VDC distribution:

Board-mounted conversion (direct-to-server): 800 VDC delivered directly to server boards
Rack-mounted conversion: 800 VDC to 50 VDC at the rack with centralized power shelves. This

Rack-mounted conversion is often the preferred path below ~100 kW or when existing 50 VDC equipment must be retained.

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Purpose-Built Rack Power Solutions

Hyperscale Infrastructure

The rapid growth of Al, cloud computing, and high-density data center deployments is driving unprecedented power demands. Traditional AC power distribution architectures introduce multiple conversion stages, resulting in increased energy losses, higher operating costs, larger infrastructure footprints, and greater system complexity.

Our Solution: High-Efficiency 800 VDC/HVDC Power Shelves

Advanced Energy’s high voltage DC (HVDC) power shelves enable efficient and scalable power distribution for modern Al, cloud, telecom, and hyperscale environments. By distributing power at higher DC voltages (e.g. 800 VDC architectures), our solutions reduce conversion losses, simplify power architectures, and enable higher-density deployments while maintaining industry-leading reliability.

Why HVDC?

HVDC distribution helps eliminate unnecessary conversion stages, improve efficiency, support higher rack power densities, simplify renewable energy integration, reduce infrastructure footprint, and enable more sustainable operations.

Built for Hyperscale, Al, and Cloud Infrastructure

Talk to us about how our purpose-built HVDC power shelves meet the needs of hyperscaler operators, cloud service providers, AI training facilities, and next-generation data centers.

Talk to us about AE can support your next-generation AI infrastructure.

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Solutions for a Complete Modular HVDC Architecture

Meeting global safety and EMI requirements, Advanced Energy’s 800 VDC solutions integrate OCP, OVP/UVP, and OTP protection and support megawatt-class racks with liquid-cooled PDBs.

Compact, Integrated 800 V PDBs

Custom PDBs integrate:

Hot-swap control
Hold-up capacitance
HVDC conversion

Direct liquid cooling boosts thermal performance, enables higher continuous power, and integrates with data center cooling infrastructure

Hot-Swap Control at the HVDC Output

Advanced Energy’s hot-swap controllers:

Limit inrush current
Discharge hold-up capacitors for safe servicing
Monitor input voltage and current at power entry
Enable digital system control via digital communication interface

High-Efficiency HVDC DC-DC Conversion

Designed for power-dense AI infrastructure, board-mounted isolated 16:1 converters provide:

Up to 98% efficiency under liquid cooling
PMBus monitoring and control
Reinforced insulation, optimized spacing, and high-voltage transformer design

Ultra-High-Density Non-Isolated DC DC Bus Converters

Advanced Energy’s NDQ bus converters deliver high-density, ultra-efficient 48 V to 12 V conversion for high-power computing and storage applications with:

40 to 60 VDC input
Up to 1600 W output and 97.7% peak efficiency
Standard quarter-brick form factor and pin configuration
Optional PMBus monitoring and control
Selection of remote sense or current sharing

Talk to us about AE can support your next-generation AI infrastructure.

Get in touch with one of our application experts. Contact Us

Frequently Asked Questions

What safety approvals are necessary for 800 VDC data center architectures and how is insulation/isolation realized?

What fluid types are used to dissipate heat from the module?

What is the cooling-fluid temperature for data center 800 VDC designs?

What is the impact at facility and cabinet levels of conducted EMI with fundamental shifted to >1 MHz?

Why is discharge function important for 800 VDC architectures?

Why is inrush limiting needed?

Why should I use ±400 VDC (800 VDC) as a distribution voltage?

800 VDC — High Voltage DC Distribution for Data Centers

800 VDC: Higher Voltage, Lower Current

Enabling the Shift to 800 VDC

Hyperscale Infrastructure

Our Solution: High-Efficiency 800 VDC/HVDC Power Shelves

Why HVDC?

Built for Hyperscale, Al, and Cloud Infrastructure

Compact, Integrated 800 V PDBs

Hot-Swap Control at the HVDC Output

High-Efficiency HVDC DC-DC Conversion

Ultra-High-Density Non-Isolated DC DC Bus Converters

Frequently Asked Questions

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